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TRANSCRIPT
Zinc oxide varistor is a voltage dependent resistor with symmetrical
voltage-current characteristics that is designed to protect all kinds of
electronic devices or elements from switching and induced lightening
surges.It is non linear exponent characteristic with broad using range
and mass production is gradually being used by various level of
electric engineering.
WMR Zinc Oxide Varistors
Features
Fast response time.
Low leakage current.
Excellent voltage ratio.
Wide voltage energy ratio.
Low standby power and no follow on current.
High performance in surge current handling capability.
High performance in clamping voltage characteristics.
Applications
IC,diode,transistor,thyristor,triac,and other semiconductor
protection.
Suppression of main borne transients in consumer
electronics and industrial electronics.
Suppression of internally generated spikes in electronics circuit.
Surge protection in communication, measuring and
controller electronics.
Surge protection in electronic home appliances and gas and
petroleum appliances.
Relay and electromagnetic valve surge absorption.
The varistor is rest state has a high impedance(several megaohms)
in relation to the component to be protected and does not change
the characteristics of the electric circuit. In the presence of
transient voltage(over the breakdown voltage of varistor),the
varistor then has a low impedance(a few ohms) and short circuits,
i.e. The assembly E to be protected.
E
Rest State
E
Protective State
WMR VARISTORS
WANMING ELECTRONIC CO.,LTD.1
Parameters definition1. Varistor voltage(breaddown voltage):
The varistor voltage is the voltage across the varistor measured
at a specified current Ic(0.1mA or 1mA) of specified duration.
2. Maximum allowable voltage:
The Maximum allowable voltage corresponds to the rest state of
the varistor. The rest state voltage offers a low leakage current in
order to limit the power consumption of the protected device and
not to disturb the circuit to be protected.
3. Maximum clamping voltage:
Maximum clamping voltage is the maximum voltage Vp between
two terminals with the specified standard impulse current Ip
(8 20u sec), The voltage value is an indication on the protective
function of the varistor.
4. Maximum Peak Current
Withstanding surge current is the maximum peak current for the
varistor with the specified standard impulse current(8 20u sec),
applied one time or two times and corresponding to permissible
variation of 10% in the varistor voltage change.
5. Maximum Energy
Maximum energy from one or a burst of pulses. It is the value
within the varistor change of 10% when one impulse of 10 1000
u sec is applied.
E=K V m Im T
E:Energy
K:Constant=1.4
Vm :Max.clamping voltage at Im.
I m :Max.allowable single surge current of 10 1000 u sec.
T:Duration of surge current(1000 u secretary)
6. Rated power
The maximum power that can be applied within the specified
ambient temperature.
7. Capacitance
The capacitance of varistor is the reference value measured
between the varistor terminals at specified frequency.
8. Pulse lifetime rating
This is expressed as the maximum allowable number of impulse
currents applied. 8 20u sec impulse current(or 10 1000 u sec)
is applied at prescribed interval. This curve also provides for
derating current as required with repetitive pulsing.
1.
Ic 0.1mA 1mA)
2.
3.
Ip (8 20us),
Vp
4.
(8 20us),
1 2 10%
5.
10 1000 us.
10%
E=K V m Im T
E:
K: 1.4
Vm: Im
Im: 10 1000 u sec
T: 1000 u sec
6.
7.
8.
8 20 u sec. 10 1000 u sec.)
WANMING ELECTRONIC CO.,LTD.2
WMR VARISTORS
WMR
Direct lightning surges.
Surge voltage by grounding fault.
From magnetic induction.
Induced lightning surges.
Surge voltage by switching operation.
From electrostatic induction.
Source of Surge Voltage
How to select WMR varistor
To identify the source and route of surge.
To decide the connection method of varistor.
To decide varistor voltage and max. Clamping voltage.
To decide surge current waveform by caculation from surge
voltage and surge impedance.
To check whether the withstanding surge current and surge life
of varistor is sufficient or not.
To check the variation of electric power of protected device.
To check whether the max. Energy and energy life of varistor
is enough or not.
To check the relation:
Max. Withstanding voltage of protected device Max. Clamping
voltage of varistor The real clamping voltage occurred Break-
down voltage of varistor Operating voltage of protected device.
To check whether the loss of capacitance of varistor in operating
condition.
To check whether the problem caused by loss current of leakage.
To check the connection method of varistor.
To check the condition of varistor overload.
To check any other problems by various operating conditions.
To test and to verify by real practice.
To check the connection of the grounding wire.
WANMING ELECTRONIC CO.,LTD.3
WMR VARISTORS
Standar D Series
Construction
Round varistor element, leaded
Coating: epoxy resin,flame-retardant to UL 94 V-0
Therminals : tinned copper wire
Recommended Applications
Transistor, diode, IC, thyristor or triac semiconductor
protection
Surge protection in industrial power plant operations
Relay or electromagnetic valve surge absorption
Surge absorption applications in broadcasting,
communications devices, traffic/railroad,agricultural
facilities, waterworks
Surge protection of automatic control devices for
power distridution line
Features
Wide operating voltage range 11... 1100Vrms
Coating: epoxy resin,flame-retardant to UL 94 V-0
Therminals : tinned copper wire
WANMING ELECTRONIC CO.,LTD.4
Explanation of part Numbers
W M R D A BK
Wanming ( WMEC) Zinc Oxide Varistor
Element Size
05
07
10
14
20
25
5 mm
7 mm
10 mm
14 mm
20 mm
25 mm
Type
Norminal Varistor Voltage
The first two dingits are significantfigures and the third one denotesthe number of zeros following.
Varistor Voltage Tolerance
K
L
10%
15%
Lead Style
Packing
B
T
R
Bulk
Tanping Ammo
Tanping Reel
WMR VARISTORS
* Measuring Current of Varistor Voltage05D Series ( WMR05D180L to WMR05D680) 0.1mAOthers: 1mA
Rated Power
Part Number
WMR05D180 to WMR05D680
WMR07D180 to WMR07D680
WMR10D180 to WMR10D680
WMR14D180 to WMR14D680
WMR20D180 to WMR20D680
Rated Power ( W )
0.01
0.02
0.05
0.10
0.20
Operating Temperature Range : -40 to 85
Storage Temperature Range :-40 to 125
Varistor Voltage*
(V) ACrms(V) DC (V)
Part Number
MaximumAllowable Voltage
Clamping Voltage @8/20us
Peak Current @ 8/20us (A)
Maximum Maximum Energy ( Joule)
max. (V) Ip (A) 10/1000us 2 ms
Recommended Applications
1 time 2 times
WMR05D180L
WMR07D180L
WMR10D180L
WMR14D180L
WMR20D180L
WMR05D220K
WMR07D220K
WMR10D220K
WMR14D220K
WMR20D220K
WMR05D270K
WMR07D270K
WMR10D270K
WMR14D270K
WMR20D270K
WMR05D330K
WMR07D330K
WMR10D330K
WMR14D330K
WMR20D330K
WMR05D390K
WMR07D390K
WMR10D390K
WMR14D390K
WMR20D390K
WMR05D470K
WMR07D470K
WMR10D470K
WMR14D470K
WMR20D470K
WMR05D560K
WMR07D560K
WMR10D560K
WMR14D560K
WMR20D560K
WMR05D680K
WMR07D680K
WMR10D680K
WMR14D680K
WMR20D680K
18
(16-21)
22
(20-24)
27
(24-30)
33
(30-36)
39
(35-43)
47
(42-52)
56
(50-62)
68
(61-75)
11 14
14 18
17 22
20 26
25 31
30 38
35 45
40 56
40
36
36
36
36
48
43
43
43
43
60
53
53
53
53
73
65
65
65
65
86
77
77
77
77
104
93
93
93
93
12
110
110
110
110
150
135
135
135
135
1
2.5
5
10
20
1
2.5
5
10
20
1
2.5
5
10
20
1
2.5
5
10
20
1
2.5
5
10
20
1
2.5
5
10
20
1
2.5
5
10
20
1
2.5
5
10
20
0.4
0.9
2.1
4
11
0.5
0.6
0.8
0.9
1.1
2.5
5
14
1.4
3
6
18
1.7
4
7.5
23
2.1
4.6
8.6
26
1.1
2.5
5.5
10
33
1.3
3.1
7
11
41
1.6
3.6
8.2
14
46
0.3
0.8
1.5
3.5
10
0.4
0.5
0.6
0.8
0.9
2
4
13
1
2.5
5
15
1.2
3
6
20
1.5
3.5
7
24
1
1.8
4.5
8.5
30
1
2.2
5.5
10
35
1.2
2.5
6.5
12
40
100
250
500
1000
2000
100
250
500
1000
2000
100
250
500
1000
2000
100
250
500
1000
2000
100
250
500
1000
2000
100
250
500
1000
2000
100
250
500
1000
2000
100
250
500
1000
2000
50
125
250
500
1000
50
125
250
500
1000
50
125
250
500
1000
50
125
250
500
1000
50
125
250
500
1000
50
125
250
500
1000
50
125
250
500
1000
50
125
250
500
1000
Reference Guide to Standard Products( WMR D180L to WMR D680K)
WANMING ELECTRONIC CO.,LTD.5
WMR VARISTORS
For the low voltage circuit
Reference Guide to Standard Products( WMR D820K to WMR D182K)
Varistor Voltage*
(V) ACrms(V) DC (V)
Part Number
MaximumAllowable Voltage
Clamping Voltage @8/20us
Peak Current @ 8/20us (A)
Maximum Maximum Energy ( Joule)
max. (V) Ip (A) 10/1000us 2 ms
Recommended Applications
1 time 2 times
WMR05D820K
WMR07D820K
WMR10D820K
WMR14D820K
WMR20D820K
WMR05D101K
WMR07D101K
WMR10D101K
WMR14D101K
WMR20D101K
WMR05D121K
WMR07D121K
WMR10D121K
WMR14D121K
WMR20D121K
WMR05D151K
WMR07D151K
WMR10D151K
WMR14D151K
WMR20D151K
WMR05D181K
WMR07D181K
WMR10D181K
WMR14D181K
WMR20D181K
WMR05D201K
WMR07D201K
WMR10D201K
WMR14D201K
WMR20D201K
WMR05D221K
WMR07D221K
WMR10D221K
WMR14D221K
WMR20D221K
WMR05D241K
WMR07D241K
WMR10D241K
WMR14D241K
WMR20D241K
WMR05D271K
WMR07D271K
WMR10D271K
WMR14D271K
WMR20D271K
WMR05D301K
WMR07D301K
WMR10D301K
WMR14D301K
WMR20D301K
82
(74-90)
100
(90-110)
120
(108-132)
150
(135-165)
180
(162-198)
200
(185-225)
220
(198-242)
240
(216-264)
50 65
60 85
75 100
95 125
115 150
130 170
140 180
150 200
145
135
135
135
135
175
165
165
165
165
210
200
200
200
200
260
250
250
250
250
320
300
300
300
300
355
340
340
340
340
380
360
360
360
360
415
395
395
395
395
475
455
455
455
455
520
500
500
500
500
5
10
25
50
100
5
10
25
50
100
5
10
25
50
100
5
10
25
50
100
5
10
25
50
100
5
10
25
50
100
5
10
25
50
100
5
10
25
50
100
5
10
25
50
100
5
10
25
50
100
3.5
7
14
28
56
4
5
6.5
7.5
8.5
9
10.5
8.5
17
35
70
10
20
42
85
13
25
53
106
16
30
60
130
17.5
35
70
140
19
39
78
155
21
42
84
168
11
24
49
99
190
12
26
54
108
210
2.5
5
10
20
40
3
6
12
25
50
3.5
7
14.5
30
60
4.5
9
18
37.5
75
6
12.5
25
50
100
6
12.5
25
50
100
6.5
13.5
27.5
55
110
7.5
15
30
60
120
8
17
35
70
135
9.5
20
42
80
160
100
250
500
1000
2000
100
250
500
1000
2000
100
250
500
1000
2000
100
250
500
1000
2000
100
250
500
1000
2000
100
250
500
1000
2000
100
250
500
1000
2000
100
250
500
1000
2000
800
1750
3500
6000
10000
800
1750
3500
6000
10000
50
125
250
500
1000
50
125
250
500
1000
50
125
250
500
1000
50
125
250
500
1000
50
125
250
500
1000
50
125
250
500
1000
50
125
250
500
1000
50
125
250
500
1000
600
1250
2500
5000
7000
600
1250
2500
5000
7000
270
(247-303)
300
(270-330)
175 225
190 250
WANMING ELECTRONIC CO.,LTD.6
Telephone, Communication
Line(DC 48 V)
AC 100 V to 120 V, Line-Line
Applications
AC 100 V Line-Line
Applications
AC 100 V to 120 V, Line-Line
Applications
Telephone Line Application,
(250 V Insulation Resistance
Test Applications)
WMR VARISTORS
Reference Guide to Standard Products
Varistor Voltage*
(V) ACrms(V) DC (V)
Part Number
MaximumAllowable Voltage
Clamping Voltage @8/20us
Peak Current @ 8/20us (A)
Maximum Maximum Energy ( Joule)
max. (V) Ip (A) 10/1000us 2 ms
Recommended Applications
1 time 2 times
WMR05D331K
WMR07D K
WMR10D K
WMR14D K
WMR20D K
331
331
331
331
WMR05D361K
WMR07D361K
WMR10D361K
WMR14D361K
WMR20D361K
WMR05D391K
WMR07D391K
WMR10D391K
WMR14D391K
WMR20D391K
WMR05D431K
WMR07D431K
WMR10D431K
WMR14D431K
WMR20D431K
WMR05D471K
WMR07D471K
WMR10D471K
WMR14D471K
WMR20D471K
WMR07D511K
WMR10D511K
WMR14D511K
WMR20D511K
WMR07D561K
WMR10D561K
WMR14D561K
WMR20D561K
WMR10D621K
WMR14D621K
WMR20D621K
WMR10D681K
WMR14D681K
WMR20D681K
WMR10D751K
WMR14D751K
WMR20D751K
WMR10D781K
WMR14D781K
WMR20D781K
WMR10D821K
WMR14D821K
WMR20D821K
330
(297-363)
360
(324-396)
390
(351-429)
430
(387-473)
470
(423-517)
510
(459-561)
220
(198-242)
620
(558-682)
210 270
230 300
250 320
275 350
300 385
320 410
385 505
420 560
570
545
545
545
545
620
595
595
675
650
745
710
710
710
710
810
775
775
775
775
845
845
845
845
360
360
360
360
1025
1025
1025
1120
1120
1120
1240
1240
1240
1355
1355
1355
595
595
650
650
650
1355
1355
1355
5
10
25
50
100
5
10
25
50
100
5
10
25
50
100
5
10
25
50
100
5
10
25
50
100
10
25
50
100
10
25
50
100
25
50
100
25
50
100
25
50
100
25
50
100
25
50
100
13
28
58
115
228
16
32
65
130
255
17
35
70
140
275
20
40
80
155
303
7.5
45
92
190
382
92
190
382
90
190
382
100
210
420
110
235
460
16
30
60
130
19
39
78
155
110
235
460
800
1750
3500
6000
10000
1750
3500
6000
10000
3500
5000
7500
800
1750
3500
6000
10000
800
1750
3500
6000
10000
800
1750
3500
6000
10000
800
1750
3500
6000
10000
250
500
1000
2000
3500
5000
7500
3500
5000
7500
3500
5000
7500
3500
5000
7500
600
1250
2500
4500
6500
1250
2500
4500
6500
2500
4500
6500
600
1250
2500
4500
6500
600
1250
2500
4500
6500
600
1250
2500
4500
6500
600
1250
2500
4500
6500
125
250
500
1000
2500
4500
6500
2500
4500
6500
2500
4500
6500
2500
4500
6500
680
(612-748)
750
(675-825)
460 615
510 670
WANMING ELECTRONIC CO.,LTD.7
9.5
20
42
80
160
16
30
60
130
19
39
78
155
80
165
325
11
23
45
90
180
12
25
50
100
195
13.5
27.5
55
110
215
7.5
32
67
136
273
67
136
273
67
136
273
70
150
300
80
165
325
AC 100 V to 120 V, Line-Line
Applications
Telephone Line Application,
(250 V Insulation Resistance
Test Applications)
AC 100 V to 120 V, Line-Line
and
AC 100 V to 220 V, Line-
Ground Applications
AC 100 V to 120 V, Line-Line
and
AC 100 V to 220 V, Line-
Ground Applications
AC 100 V to 240 V, Line-Line
AC 100 V to 220 V, Line-
Ground Applications
Applications
820
(738-902)
AC 380 V, Line-Line and
Line-Ground Applications
(For DC 500V Insulating
Test)
WMR VARISTORS
820
(738-902)
510 670
Reference Guide to Standard Products
Varistor Voltage*
(V) ACrms(V) DC (V)
Part Number
MaximumAllowable Voltage
Clamping Voltage @8/20us
Peak Current @ 8/20us (A)
Maximum Maximum Energy ( Joule)
max. (V) Ip (A) 10/1000us 2 ms
Recommended Applications
1 time 2 times
1100
(990-1210)
WANMING ELECTRONIC CO.,LTD.8
680 895
AC 480V, Line-Line and Line
-Ground Applications
(For DC 500V Insulating Test)WMR10D112K
WMR14D112K
WMR20D112K
WMR10D182K
WMR14D182K
WMR20D182K
1815
1815
1815
2970
2970
2970
25
50
100
25
50
100
25
50
100
25
50
100
130
255
510
140
280
565
155
310
620
247
510
1020
90
180
360
100
200
400
110
220
440
183
360
720
2500
4500
6500
2500
4500
6500
3500
5000
7500
3500
5000
7500
3500
5000
7500
3500
5000
7500
2500
4500
6500
2500
4500
6500
Line-Ground Applications
(For AC 1200V Withstanding
Test)
1800
(1700-1980)
1000 1465
WMR10D911K
WMR14D911K
WMR20D911K
WMR10D102K
WMR14D102K
WMR20D102K
Measuring Current of Varistor Voltage
5 Series (WMR05D820 to WMR05D471): 0.1 mA
Others: 1 mA
Rated Power
Part Number Rated Power(W)
WMR05D820 to WMR05D471
WMR07D820 to WMR07D511
WMR10D820 to WMR10D182
WMR14D820 to WMR14D182
WMR20D820 to WMR20D182
0.10
0.25
0.40
0.60
1.00
Operating Temperature Range: -40 to 85 Strage Temperature Range: -40 to 85
WMR VARISTORS
910
(819-1001)
1000
(900-1100)
550 745
625 825
AC 415V, Line-Line and Line
-Ground Applications
(For DC 500V Insulating Test)
1500
1500
1500
1650
1650
1650
05D Series
Varistor Voltage
WMR-05D180L
WMR-05D220K
WMR-05D270K
WMR-05D330K
WMR-05D390K
WMR-05D470K
WMR-05D560K
WMR-05D680K
WMR-05D820K
WMR-05D101K
WMR-05D121K
WMR-05D151K
WMR-05D181K
WMR-05D201K
WMR-05D221K
WMR-05D241K
WMR-05D271K
WMR-05D301K
WMR-05D331K
WMR-05D361K
WMR-05D391K
WMR-05D431K
WMR-05D471K
WMR-05D511K
WMR-05D561K
V0.1mA (V) AC rms (V)
DC(V)
1time (A)
2times (A)
(W)10/1000 us
@1KHz(pF)
Part No.
The clamping voltage from 180K to 680K is tested with current 1A.
MaximumAllowable Voltage
Clamping Voltage (max.)
MaximunPeak Current (8/20us)
Rated Power
Energy10/1000us
TypicalCapacitance(Reference)
18 (16-21)
22 (20-24)
27 (24-30)
33 (30-36)
39 (35-43)
47 (42-52)
56 (50-62)
68 (61-75)
82 (74-90)
100 (90-110)
120 (108-132)
150 (135-165)
180 (162-198)
200 (185-225)
220 (198-242)
240 (216-264)
270 (243-297)
300 (270-330)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
11
14
17
20
25
30
35
40
50
60
75
95
115
130
140
150
175
190
210
230
250
275
300
320
350
14
18
22
26
31
38
45
56
65
85
100
125
150
170
180
200
225
250
275
300
320
350
385
415
460
100
100
100
100
100
100
100
100
400
400
400
400
400
400
400
400
400
400
400
400
400
400
400
400
400
50
50
50
50
50
50
50
50
200
200
200
200
200
200
200
200
200
200
200
200
200
200
200
200
200
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
2ms
0.4
0.5
0.6
0.8
0.9
1.1
1.3
1.6
2.5
3.0
4.0
4.8
5.9
6.5
7.0
8.0
8.5
9.0
9.5
10.0
12.0
13.0
15.0
16.0
16.0
0.3
0.4
0.5
0.6
0.8
1.0
1.0
1.2
1.7
2.0
2.5
3.0
3.6
4.0
4.5
5.0
6.0
6.5
7.0
7.5
8.0
9.0
10.0
11.0
11.0
40
48
60
73
86
104
123
150
145
175
210
260
320
355
380
415
475
520
570
620
675
745
810
845
920
1400
1150
930
760
640
530
450
370
300
250
210
165
140
125
110
100
95
85
75
70
65
60
55
50
45
VVDD EE
R R
Ratings and CharacteristicsOperating Temperature Range : -40 to 85
Storage
Temperature Range :-40 to 125
Temperature Coefficient Of Varistor Voltage : 0 to - 0.05%/
V 5mA (V)(J ) (J )
WANMING ELECTRONIC CO.,LTD.9
WMR VARISTORS
Dimensions in mm
Part No.
WMR-05D180LWMR-05D220KWMR-05D270KWMR-05D330KWMR-05D390KWMR-05D470KWMR-05D560KWMR-05D680KWMR-05D820KWMR-05D101KWMR-05D121KWMR-05D151KWMR-05D181KWMR-05D201KWMR-05D221KWMR-05D241KWMR-05D271KWMR-05D301KWMR-05D331KWMR-05D361KWMR-05D391KWMR-05D431KWMR-05D471KWMR-05D511KWMR-05D561K
D max. T max. F H max. a d
7.07.07.07.07.07.07.07.07.07.07.07.07.07.07.07.07.07.07.07.07.07.07.07.07.0
4.54.54.54.54.54.55.05.24.14.34.54.84.34.44.54.64.95.05.15.25.45.76.06.06.0
5.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.0
10.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.0
1.5 1.01.5 1.01.5 1.01.5 1.01.5 1.01.5 1.01.8 1.02.3 1.01.5 1.01.5 1.01.8 1.01.6 1.01.6 1.01.6 1.01.7 1.01.7 1.01.9 1.01.9 1.01.9 1.02.4 1.02.6 1.02.7 1.02.8 1.03.0 1.03.2 1.0
0.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.05
Typical Characteristics
Voltage vs. Current
10 Times
2 Times
10 Times
210 Times
310 Times
10 Times10 Times
20 100 1000
Impulse Width ( us)
10000
100
504030
20
10
543
2
1
0.50.40.3
0.2
0.1
Imp
uls
e C
urr
en
t (
A )
2 times: 5 min. Interval up to 10 times: 2 min. Intervalup to 10 times: 10 se . intervalc
6
Impulse Lifetime Ratings
WMR05D180L to WMR05D680K
D
F
T
H
a
20
.0 m
in.
1 Time
10 Times
2 Times
10 Times
210 Tim
es
310 Times
410 Times
5
10 Times
6
20 100 1000Impulse Width ( us)
10000
400300
200
100
5040
3020
10
543
2
1
0.50.40.3
0.2
Imp
uls
e C
urr
en
t (
A )
2 times: 5 min. Interval up to 10 times: 2 min. Intervalup to 10 times: 10 se . intervalc
6
0.1
WMR05D820K to WMR05D561K WMR05D820K to WMR05D561K
2000
1000900800700600500
300
200
150
10090807060
50
40
30
400
1 2 3 4 5-6 -5 -4 -3 -2 -110 10 10101010101010101010
Current ( A)
0
WMR05D561KWMR05D511KWMR05D471KWMR05D431KWMR05D391KWMR05D361K
WMR05D331KWMR05D301K
WMR05D271K
WMR05D241KWMR05D221KWMR05D201KWMR05D181KWMR05D151KWMR05D121KWMR05D101K
WMR05D820K
Max.Leakage Current
Max.Clamping Voltage
Vo
lta
ge
(V
)
WMR05D180L to WMR05D680K
1 2 3 4 5-6 -5 -4 -3 -2 -110 10 10101010101010101010
1098765
4
15
20
30
40
50
60708090
100
400
300
200
150
Test current waveform
10-6
to 10-4
A:Direct current
10-1
to 10-2
A:80/20us
Max.Leakage Current
Max.Clamping Voltage
Vo
lta
ge
(V
)
Current ( A)
0
WANMING ELECTRONIC CO.,LTD.10
WMR05D680KWMR05D560K
WMR05D470KWMR05D390K
WMR05D330K
WMR05D270K
WMR05D220K
WMR05D180L 456
1 Time
Test current waveform
10-6
to 10-4
A:Direct current
10-1
to 10-2
A:80/20us
WMR VARISTORS
07D SeriesRatings and Characteristics
Operating Temperature Range : -40 to 85
Storage
Temperature Range :-40 to 125
Temperature Coefficient Of Varistor Voltage : 0 to -0.05%/
Varistor Voltage
V 1mA (V) AC rms (V)
DC(V)
1time (A)
2times (A)
(W)10/1000 us
@1KHz(pF)
Part No.
MaximumAllowable Voltage
Clamping Voltage (max.)
Rated Power
Energy10/1000us
TypicalCapacitance(Reference)
18 (16-21)
22 (20-24)
27 (24-30)
33 (30-36)
39 (35-43)
47 (42-52)
56 (50-62)
68 (61-75)
82 (74-90)
100 (90-110)
120 (108-132)
150 (135-165)
180 (162-198)
200 (185-225)
220 (198-242)
240 (216-264)
270 (243-297)
300 (270-330)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
620 (558-682)
680 (612-748)
11
14
17
20
25
30
35
40
50
60
75
95
115
130
140
150
175
190
210
230
250
275
300
320
350
385
420
14
18
22
26
31
38
45
56
65
85
100
125
150
170
180
200
225
250
275
300
320
350
385
415
460
505
560
2ms
40
48
60
73
86
104
123
150
145
175
210
260
320
355
380
415
475
520
570
620
675
745
810
845
920
1025
1120
V 10A (V)(J ) (J )
WMR-07D180L
WMR-07D220K
WMR-07D270K
WMR-07D330K
WMR-07D390K
WMR-07D470K
WMR-07D560K
WMR-07D680K
WMR-07D820K
WMR-07D101K
WMR-07D121K
WMR-07D151K
WMR-07D181K
WMR-07D201K
WMR-07D221K
WMR-07D241K
WMR-07D271K
WMR-07D301K
WMR-07D331K
WMR-07D361K
WMR-07D391K
WMR-07D431K
WMR-07D471K
WMR-07D511K
WMR-07D561K
WMR-07D621K
WMR-07D681K
250
250
250
250
250
250
250
250
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
1200
125
125
125
125
125
125
125
125
600
600
600
600
600
600
600
600
600
600
600
600
600
600
600
600
600
600
600
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.9
1.1
1.4
1.7
2.1
2.5
3.1
3.6
5.5
6.5
7.8
9.7
11.7
13.0
14.0
15.0
18.0
20.0
23.0
25.0
25.0
28.0
30.0
30.0
30.0
33.0
33.0
0.8
0.9
1.0
1.2
1.5
1.8
2.2
2.5
3.5
4.0
5.0
6.0
8.5
10.0
10.0
10.0
12.0
13.0
14.0
15.0
17.0
20.0
20.0
20.0
20.0
22.0
22.0
2800
2300
1800
1500
1300
1100
890
740
600
500
420
330
280
250
230
210
185
165
150
140
130
115
105
100
90
80
75
The clamping voltage from 180K to 680K is tested with current 2.5A.
MaximunPeak Current (8/20us)
WANMING ELECTRONIC CO.,LTD.11
VVDD EE
R R
WMR VARISTORS
Dimensions in mm
Part No.
WMR-07D180LWMR-07D220KWMR-07D270KWMR-07D330KWMR-07D390KWMR-07D470KWMR-07D560KWMR-07D680KWMR-07D820KWMR-07D101KWMR-07D121KWMR-07D151KWMR-07D181KWMR-07D201KWMR-07D221KWMR-07D241KWMR-07D271KWMR-07D301KWMR-07D331KWMR-07D361KWMR-07D391KWMR-07D431KWMR-07D471KWMR-07D511KWMR-07D561KWMR-07D621KWMR-07D681K
D max. T max. F H max. a d
9.09.09.09.09
9.09.0
.09.09.09.09.09.09.09.09.09.09.09.09.09.09.09.09.09.09.09.09.0
5.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.05.0 1.0
13.013.013.013.013.013.013.013.013.013.013.013.013.013.013.013.013.013.013.013.013.013.013.013.013.013.013.0
1.5 1.01.5 1.01.5 1.01.6 1.01.8 1.01.8 1.02.0 1.02.3 1.01.5 1.01.5 1.01.5 1.01.8 1.01.6 1.01.6 1.01.7 1.01.9 1.02.0 1.02.1 1.02.1 1.02.5 1.02.6 1.02.9 1.02.9 1.03.0 1.03.2 1.03.3 1.03.4 1.0
0.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.050.6 0.05
Typical Characteristics
Impulse Lifetime Ratings
WMR07D180L to WMR07D680K
4.54.64.74.94.84.95.05.24.14.34.54.84.34.44.54.64.95.05.15.25.45.76.06.06.07.17.3
D
F
T
H
a
20
.0 m
in.
d
WMR07D820K to WMR05D681K
Vo
lta
ge
(V
)
2000
1000900800700600
500
300
200
10090807060
50
40
30
400
1 2 3 4 5-6 -5 -4 -3 -2 -110 10 10101010101010101010
Current ( A)
0
Max.Leakage Current
Max.Clamping Voltage
WMR07D680KWMR07D560K
WMR07D470K
WMR07D390K
WMR07D330K
WMR07D270K
WMR07D220K
WMR07D180L
1 2 3 4 5-6 -5 -4 -3 -2 -110 10 10101010101010101010
1098765
20
30
4050
60708090
100
400
300
200
Max.Leakage Current
Max.Clamping Voltage
Vo
lta
ge
(V
)
Current ( A)
0
1 Time
10 Times
2 Times10 Times
2
10 Times
3
10 Times
410 Times
5
10 Times
6
20 100 1000
Impulse Width ( us)
10000
300
200
100
504030
20
10
5432
1
0.50.40.3
0.2
0.1
Imp
uls
e C
urr
en
t (
A )
2 times: 5 min. Intervalup to 10 times: 2 min. Intervalup to 10 times: 10 se . intervalc
6
1 Time
10 Times
2 Times
10 Times
2
10 Times
4
10 Times
5
10 Times
6
20 100 1000
Impulse Width ( us)
10000
400300
200
100
504030
20
10
43
2
1
Imp
uls
e C
urr
en
t (
A )
2 times: 5 min. Interval up to 10 times: 2 min. Intervalup to 10 times: 10 se . intervalc
6
500
1000
2000
Voltage vs. Current
WMR07D180L to WMR07D680K
WMR07D820K to WMR05D681K
WANMING ELECTRONIC CO.,LTD.12
WMR07D681KWMR07D621KWMR07D561KWMR07D511KWMR07D471KWMR07D431KWMR07D391KWMR07D361KWMR07D331KWMR07D301KWMR07D271KWMR07D241KWMR07D221KWMR07D201KWMR07D181KWMR07D151KWMR07D121KWMR07D101KWMR07D820K
10 Times
3
Test current waveform
10-6
to 10-4
A:Direct current
10-1
to 10-2
A:80/20us
WMR VARISTORS
10D SeriesRatings and CharacteristicsOperating Temperature Range : -40 to 85Storage
Temperature Range :-40 to 125Temperature Coefficient Of Varistor Voltage : 0 to -0.05%/
Varistor Voltage
V 1mA (V) AC rms (V)
DC(V)
1time (A)
2times (A)
(W)10/1000 us
@1KHz(pF)
Part No.
MaximumAllowable Voltage
Clamping Voltage (max.)
Rated Power
Energy10/1000us
TypicalCapacitance(Reference)
18 (16-21)
22 (20-24)
27 (24-30)
33 (30-36)
39 (35-43)
47 (42-52)
56 (50-62)
68 (61-75)
82 (74-90)
100 (90-110)
120 (108-132)
150 (135-165)
180 (162-198)
200 (185-225)
220 (198-242)
240 (216-264)
270 (243-297)
300 (270-330)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
620 (558-682)
680 (612-748)
750 (675-825)
780 (702-858)
820 (738-902)
910 (819-1001)
1000 (900-1100)
1100 (990-1210)
11
14
17
20
25
30
35
40
50
60
75
95
115
130
140
150
175
190
210
230
250
275
300
320
350
385
420
460
485
510
550
625
680
14
18
22
26
31
38
45
56
65
85
100
125
150
170
180
200
225
250
275
300
320
350
385
415
460
505
560
615
640
670
745
825
895
2msVV
DD EER R
V 25A (V)(J ) (J )
The clamping voltage from 180K to 680K is tested with current 5A.
WMR-10D180L
WMR-10D220K
WMR-10D270K
WMR-10D330K
WMR-10D390K
WMR-10D470K
WMR-10D560K
WMR-10D680K
WMR-10D820K
WMR-10D101K
WMR-10D121K
WMR-10D151K
WMR-10D181K
WMR-10D201K
WMR-10D221K
WMR-10D241K
WMR-10D271K
WMR-10D301K
WMR-10D331K
WMR-10D361K
WMR-10D391K
WMR-10D431K
WMR-10D471K
WMR-10D511K
WMR-10D561K
WMR-10D621K
WMR-10D681K
WMR-10D751K
WMR-10D781K
WMR-10D821K
WMR-10D911K
WMR-10D102K
WMR-10D112K
36
43
53
65
77
93
110
135
135
165
200
250
300
340
360
395
455
500
550
595
650
710
775
845
920
1025
1120
1240
1290
1355
1500
1650
1815
500
500
500
500
500
500
500
500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
250
250
250
250
250
250
250
250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
2.1
2.5
3.0
4.0
4.6
5.5
7.0
8.2
12.0
15.0
18.0
22.0
27.0
30.0
32.0
35.0
40.0
40.0
43.0
47.0
60.0
65.0
70.0
70.0
70.0
70.0
70.0
75.0
80.0
85.0
93.0
102.0
115.0
1.5
2.0
2.5
3.0
3.5
4.5
5.5
6.5
8.0
10.0
12.0
16.0
18.5
20.0
23.0
25.0
30.0
32.0
34.0
35.0
40.0
45.0
45.0
45.0
45.0
45.0
45.0
50.0
50.0
55.0
60.0
65.0
70.0
5600
4500
3700
3000
2400
2100
1800
1500
1200
1000
830
670
560
500
450
420
370
330
300
280
260
230
210
200
180
160
150
130
130
120
110
100
90
MaximunPeak Current (8/20us)
WANMING ELECTRONIC CO.,LTD.13
WMR VARISTORS
Dimensions in mm
Part No.
WMR-10D180LWMR-10D220KWMR-10D270KWMR-10D330KWMR-10D390KWMR-10D470KWMR-10D560KWMR-10D680KWMR-10D820KWMR-10D101KWMR-10D121KWMR-10D151KWMR-10D181KWMR-10D201KWMR-10D221KWMR-10D241KWMR-10D271KWMR-10D301KWMR-10D331KWMR-10D361KWMR-10D391KWMR-10D431KWMR-10D471KWMR-10D511KWMR-10D561KWMR-10D621KWMR-10D681KWMR-10D751KWMR-10D781KWMR-10D821KWMR-10D911KWMR-10D102KWMR-10D112K
D max. T max. F H max. a d
12.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.5
7.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.0
17.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.017.0
1.4 1.01.5
6.06.0
1.01.5 1.01.6 1.01.8 1.01.8 1.02.0 1.02.3 1.01.5 1.01.5 1.01.5 1.01.8 1.01.6 1.01.6 1.01.7 1.01.9 1.02.0 1.02.2 1.02.2 1.02.5 1.02.8 1.03.1 1.03.2 1.03.7 1.04.0 1.04.6 1.05.0 1.05.0 1.05.2 1.05.2 1.0
1.01.0
6.3 1.0
0.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.05
Typical Characteristics
Voltage vs. Current
WMR10D180L to WMR10D680K
Impulse Lifetime Ratings
WMR10D180L to WMR10D680K
4.64.74.85.05.35.45.55.64.74.95.15.45.05.05.05.25.45.55.86.06.26.56.86.86.87.37.68.08.18.38.89.39.9
D
F
T
H
a
20
.0 m
in.
d
1 2 3 4 5-6 -5 -4 -3 -2 -110 10 10101010101010101010
109876
5
20
30
40
50
60708090
100
400
300
200
Max.Leakage Current
Max.Clamping Voltage
Vo
lta
ge
(V
)
Current ( A)
0
500
1 Time
10 Times
2 Times
10 Times
6
20 100 1000
Impulse Width ( us)
10000
400300
200
100
504030
20
10
4
3
2
1
Imp
uls
e C
urr
en
t (
A )
2 times: 5 min. Intervalup to 10 times: 2 min. Intervalup to 10 times: 10 se . intervalc
6
500
5
0.5
10 Times
3
10 Times
4
10 Times
5
10 Times
2
WANMING ELECTRONIC CO.,LTD.14
WMR10D680K
WMR10D560K
WMR10D470K
WMR10D390K
WMR10D330K
WMR10D270K
WMR10D220K
WMR10D180L
Test current waveform
10-6
to 10-4
A:Direct current
10-1
to 10-2
A:80/20us
WMR VARISTORS
1 Time
2 Times
10 Times
310 Times
4
20 100 1000
Impulse Width ( us)
10000
400300
200
100
504030
20
10
4
3
2
1
Imp
uls
e C
urr
en
t (
A )
2 times: 5 min. Intervalup to 10 times: 2 min. Intervalup to 10 times: 10 se . intervalc6
3000
2000
1000
5
500
Typical Characteristics
Voltage vs. Current
WMR10D820K to WMR10D471KImpulse Lifetime Ratings
WMR10D820k to WMR10D471K
2000
1000
900800
700
600
500
300
200
400
1 2 3 4 5-6 -5 -4 -3 -2 -110 10 10101010101010101010
0
WMR10D112KWMR10D102KWMR10D911KWMR10D821KWMR10D781KWMR10D751KWMR10D681KWMR10D621KWMR10D561KWMR10D511K
5000
4000
3000
Vo
lta
ge
(V
)
Max.Leakage Current
Max.Clamping Voltage
2000
1000900800700
600
500
300
200
100908070
60
50
40
30
400
1 2 3 4 5-6 -5 -4 -3 -2 -1
10 10 10101010101010101010
Current ( A)
0
WMR10D471KWMR10D431KWMR10D391KWMR10D361KWMR10D331KWMR10D301KWMR10D271KWMR10D241KWMR10D221KWMR10D201KWMR10181K
WMR10D151K
WMR10D121KWMR10D101KWMR10D820K
150
Vo
lta
ge
(V
)
Max.Leakage Current
Max.Clamping Voltage
WMR10D511K to WMR10D112K
1 Time
2 Times
10 Times
310 Times
4
20 100 1000
Impulse Width ( us)
10000
400300
200
100
504030
20
10
4
3
2
1
Imp
uls
e C
urr
en
t (
A )
2 times: 5 min. Intervalup to 10 times: 2 min. Intervalup to 10 times: 10 se . intervalc
6
3000
2000
1000
5
500
WMR10D511K to WMR10D112K
WANMING ELECTRONIC CO.,LTD.15
Test current waveform
10-6
to 10-4
A:Direct current
10-1
to 10-2
A:80/20us
Test current waveform
10-6
to 10-4
A:Direct current
10-1
to 10-2
A:80/20us
10 Times10 Tim
es
2
10 Times
6
10 Times
5
10 Times10 Times
2
10 Times
5
10 Times
6
WMR VARISTORS
14D SeriesRatings and Characteristics
Operating Temperature Range : -40 to 85
Storage
Temperature Range :-40 to 125
Temperature Coefficient Of Varistor Voltage : 0 to -0.05%/
Varistor Voltage
V 1mA (V) AC rms (V)
DC(V)
1time (A)
2times (A)
(W)10/1000 us
@1KHz(pF)
Part No.
MaximumAllowable Voltage
Clamping Voltage (max.)
Rated Power
Energy10/1000us
TypicalCapacitance(Reference)
18 (16-21)
22 (20-24)
27 (24-30)
33 (30-36)
39 (35-43)
47 (42-52)
56 (50-62)
68 (61-75)
82 (74-90)
100 (90-110)
120 (108-132)
150 (135-165)
180 (162-198)
200 (185-225)
220 (198-242)
240 (216-264)
270 (243-297)
300 (270-330)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
620 (558-682)
680 (612-748)
750 (675-825)
780 (702-858)
820 (738-902)
910 (819-1001)
1000 (900-1100)
1100 (990-1210)
11
14
17
20
25
30
35
40
50
60
75
95
115
130
140
150
175
190
210
230
250
275
300
320
350
385
420
460
485
510
550
625
680
1000
14
18
22
26
31
38
45
56
65
85
100
125
150
170
180
200
225
250
275
300
320
350
385
415
460
505
560
615
640
670
745
825
895
2msVV
DD EER R
V 50 A (V)(J ) (J )
The clamping voltage from 180K to 680K is tested with current 10A.
36
43
53
65
77
93
110
135
135
165
200
250
300
340
360
395
455
500
550
595
650
710
775
845
920
1025
1120
1240
1290
1355
1500
1650
1815
2970
WMR-14D180L
WMR-14D220K
WMR-14D270K
WMR-14D330K
WMR-14D390K
WMR-14D470K
WMR-14D560K
WMR-14D680K
WMR-14D820K
WMR-14D101K
WMR-14D121K
WMR-14D151K
WMR-14D181K
WMR-14D201K
WMR-14D221K
WMR-14D241K
WMR-14D271K
WMR-14D301K
WMR-14D331K
WMR-14D361K
WMR-14D391K
WMR-14D431K
WMR-14D471K
WMR-14D511K
WMR-14D561K
WMR-14D621K
WMR-14D681K
WMR-14D751K
WMR-14D781K
WMR-14D821K
WMR-14D911K
WMR-14D102K
WMR-14D112K
WMR-14D182K
1000
1000
1000
1000
1000
1000
1000
1000
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500.
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
500
500
500
500
500
500
500
500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
0.60
4.0
5.0
6.0
7.5
8.6
10.0
11.0
14.0
22.0
28.0
32.0
40.0
50.0
57.0
60.0
63.0
70.0
77.0
85.0
93.0
100.0
115.0
125.0
125.0
125.0
125.0
130.0
143.0
148.0
157.0
175.0
190.0
213.0
337.0
3.5
4.0
5.0
6.0
7.0
8.5
10.0
12.0
14.0
18.0
20.0
25.0
30.5
35.0
40.0
40.0
50.0
52.0
64.0
65.0
70.0
75.0
80.0
80.0
85.0
85.0
90.0
100.0
105.0
110.0
120.0
130.0
140.0
240.0
11100
9100
7400
6100
5100
4300
3600
2900
2400
2000
1700
1300
1100
1000
900
830
740
670
610
560
510
460
430
390
360
320
290
270
260
240
220
200
280
130
MaximunPeak Current (8/20us)
WANMING ELECTRONIC CO.,LTD.16
1800(1620-1980) 1465
WMR VARISTORS
Impulse Lifetime Ratings
WMR14D180L to WMR14D680K
D
F
T
H
a
20
.0 m
in.
d
Dimensions in mm
Part No.
WMR-14D180LWMR-14D220KWMR-14D270KWMR-14D330KWMR-14D390KWMR-14D470KWMR-14D560KWMR-14D680KWMR-14D820KWMR-14D101KWMR-14D121KWMR-14D151KWMR-14D181KWMR-14D201KWMR-14D221KWMR-14D241KWMR-14D271KWMR-14D301KWMR-14D331KWMR-14D361KWMR-14D391KWMR-14D431KWMR-14D471KWMR-14D511KWMR-14D561KWMR-14D621KWMR-14D681KWMR-14D751KWMR-14D781KWMR-14D821KWMR-14D911KWMR-14D102KWMR-14D112KWMR-14D182K
D max. T max. F H max. a d
16.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.516.5
7.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.07.5 1.015.0 1.0
21.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.521.522.5
1.5 1.01.6
6.06.2
1.01.7 1.01.8 1.02.0 1.02.2 1.02.5 1.01.6 1.01.6 1.01.7 1.02.0 1.01.8 1.01.8 1.01.8 1.02.1 1.02.1 1.02.3 1.02.3 1.02.7 1.02.8 1.03.1 1.03.3 1.03.7 1.04.0 1.04.4 1.04.7 1.05.0 1.05.0 1.05.2 1.05.2 1.0
1.01.0
6.8 1.010.5 2.0
0.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.050.8 0.05
4.64.74.85.05.35.45.55.64.74.95.15.45.05.05.05.25.45.55.86.06.26.56.86.86.87.37.68.08.18.38.89.39.914.4
Typical Characteristics
Voltage vs. Current
WMR14D180L to WMR14DD680K
Current ( A)
1 2 3 4 5-6 -5 -4 -3 -2 -110 10 10101010101010101010
109876
5
20
30
40
50
60708090
100
400
300
200
Max.Leakage Current
Max.Clamping Voltage
Vo
lta
ge
(V
)
0
500
1 Time2 Tim
es
10 Times
410 Tim
es
5
20 100 1000
Impulse Width ( us)
10000
400300
200
100
504030
20
10
43
2
1
Imp
uls
e C
urr
en
t (
A )
2 times: 5 min. Intervalup to 10 times: 2 min. Intervalup to 10 times: 10 se . intervalc
6500
5
0.5
1000
10 Times
3
WANMING ELECTRONIC CO.,LTD.17
WMR14D560K
WMR14D470K
WMR14D390K
WMR14D330K
WMR14D270K
WMR14D220K
WMR14D180L
WMR14D680K
Test current waveform
10-6
to 10-4
A:Direct current
10-1
to 10-2
A:80/20us
10 Times
10 Times
2
10 Times
6
WMR VARISTORS
2000
1000900800700600
500
300
200
10090807060
50
40
30
400
1 2 3 4 5-6 -5 -4 -3 -2 -110 10 10101010101010101010
Current ( A)
0
WMR14D471KWMR14D431KWMR14D391KWMR14D361KWMR14D331KWMR14D301KWMR14D271KWMR14D241KWMR14D221KWMR14D201KWMR14D181KWMR14D151KWMR14D121KWMR14D101KWMR14D820K
150Vo
lta
ge
(V
)
Max.Clamping Voltage Max.Leakage Current
Typical Characteristics
Voltage vs. Current
WMR14D820K to WMR14D471K
Impulse Lifetime Ratings
WMR14D820K to WMR14D471K
Current ( A)
2000
1000900800
700
600
500
300
200
400
1 2 3 4 5-6 -5 -4 -3 -2 -1
10 10 101010101010101010100
WMR14D112KWMR14D102KWMR14D911KWMR14D821KWMR14D781KWMR14D751KWMR14D681KWMR14D621KWMR14D561KWMR14D511K
5000
4000
3000
WMR14D182K Max.Leakage Current
Max.Clamping Voltage
Vo
lta
ge
(V
)
1 Time2 Tim
es
20 100 1000
Impulse Width ( us)
10000
600
400
200
1008060
40
20
1086
4
2
1
Imp
uls
e C
ur r
en
t (
A )
2 times: 5 min. Interval up to 10 times: 2 min. Intervalup to 10 times: 10 se . intervalc6
500040003000
2000
1000800
20 100 1000
Impulse Width ( us)
10000
600
400
200
1008060
40
20
1086
4
2
1
Imp
uls
e C
urr
en
t (
A )
500040003000
2000
1000800
WMR14D511K to WMR14D182K WMR14D511K to WMR14D182K
WANMING ELECTRONIC CO.,LTD.18
10 Times
6
10 Times
2
10 Times
10 Times
3
10 Times
4
10 Times
5
2 times: 5 min. Interval up to 10 times: 2 min. Intervalup to 10 times: 10 se . intervalc6
1 Time
2 Times
10 Times
6
10 Times
2
10 Times
10 Times
3
10 Times
4
10 Times
5
WMR VARISTORS
20D SeriesRatings and Characteristics
Operating Temperature Range : -40 to 85
Storage
Temperature Range :-40 to 125
Temperature Coefficient Of Varistor Voltage : 0 to -0.05%/
Varistor Voltage
V 1mA (V) AC rms (V)
DC(V)
1time (A)
2times (A)
(W)10/1000 us
@1KHz(pF)
Part No.
MaximumAllowable Voltage
Clamping Voltage (max.)
Rated Power
Energy10/1000us
TypicalCapacitance(Reference)
18 (16-21)
22 (20-24)
27 (24-30)
33 (30-36)
39 (35-43)
47 (42-52)
56 (50-62)
68 (61-75)
82 (74-90)
11
14
17
20
25
30
35
40
50
60
75
95
115
130
140
150
175
190
210
230
250
275
300
320
350
385
420
460
485
510
550
625
680
1000
14
18
22
26
31
38
45
56
65
85
100
125
150
170
180
200
225
250
275
300
320
350
385
415
460
505
560
615
640
670
745
825
895
1465
2msVV
DD EER R
V 100 A (V)(J ) (J )
The clamping voltage from 180K to 680K is tested with current 20A.
36
43
53
65
77
93
110
135
135
165
200
250
300
340
360
395
455
500
550
595
650
710
775
845
920
1025
1120
1240
1290
1355
1500
1650
1815
2970
WMR-20D180L
WMR-20D220K
WMR-20D270K
WMR-20D330K
WMR-20D390K
WMR-20D470K
WMR-20D560K
WMR-20D680K
WMR-20D820K
WMR-20D101K
WMR-20D121K
WMR-20D151K
WMR-20D181K
WMR-20D201K
WMR-20D221K
WMR-20D241K
WMR-20D271K
WMR-20D301K
WMR-20D331K
WMR-20D361K
WMR-20D391K
WMR-20D431K
WMR-20D471K
WMR-20D511K
WMR-20D561K
WMR-20D621K
WMR-20D681K
WMR-20D751K
WMR-20D781K
WMR-20D821K
WMR-20D911K
WMR-20D102K
WMR-20D112K
WMR-20D182K
2000
2000
2000
2000
2000
2000
2000
2000
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
1000
1000
1000
1000
1000
1000
1000
1000
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
4500
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
11.0
14.0
18.0
23.0
26.0
33.0
41.0
46.0
38.0
45.0
55.0
70.0
85.0
95.0
100.0
108.0
127.0
136.0
150.0
163.0
180.0
190.0
220.0
220.0
220.0
220.0
230.0
255.0
265.0
282.0
310.0
342.0
383.0
625.0
10.0
13.0
15.0
20.0
24.0
30.0
35.0
40.0
27.0
30.0
40.0
50.0
60.0
70.0
75.0
80.0
90.0
100.0
110.0
120.0
130.0
140.0
150.0
150.0
150.0
150.0
160.0
175.0
180.0
190.0
215.0
230.0
250.0
400.0
28500
18500
13000
11500
8500
7400
6500
5800
4900
4000
3300
2700
2200
2000
1800
1650
1500
1300
1200
1100
1000
930
850
780
710
650
600
530
510
500
440
400
360
260
MaximunPeak Current (8/20us)
WANMING ELECTRONIC CO.,LTD.19
100 (90-110)
120 (108-132)
150 (135-165)
180 (162-198)
200 (185-225)
220 (198-242)
240 (216-264)
270 (243-297)
300 (270-330)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
620 (558-682)
680 (612-748)
750 (675-825)
780 (702-858)
820 (738-902)
910 (819-1001)
1000 (900-1100)
1100 (990-1210)
1800(1620-1980)
WMR VARISTORS
Typical Characteristics
Voltage vs. Current
WMR20D180L to WMR20D680K
Impulse Lifetime Ratings
WMR20D180L to WMR20D680K
D
F
T
H
a
20
.0 m
in.
d
Dimensions in mm
Part No.
WMR-20D180LWMR-20D220KWMR-20D270KWMR-20D330KWMR-20D390KWMR-20D470KWMR-20D560KWMR-20D680KWMR-20D820KWMR-20D101KWMR-20D121KWMR-20D151KWMR-20D181KWMR-20D201KWMR-20D221KWMR-20D241KWMR-20D271KWMR-20D301KWMR-20D331KWMR-20D361KWMR-20D391KWMR-20D431KWMR-20D471KWMR-20D511KWMR-20D561KWMR-20D621KWMR-20D681KWMR-20D751KWMR-20D781KWMR-20D821KWMR-20D911KWMR-20D102KWMR-20D112KWMR-20D182K
D max. T max. F H max. a d
23.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.023.0
10.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.015.0 1.0
28.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.028.0
1.5 1.01.6
6.06.4
1.01.7 1.01.8 1.02.0 1.02.2 1.02.5 1.01.6 1.01.6 1.01.7 1.02.0 1.01.8 1.01.8 1.01.8 1.02.1 1.02.1 1.02.3 1.02.3 1.02.7 1.02.8 1.03.1 1.03.3 1.03.7 1.04.0 1.04.4 1.04.7 1.05.0 1.05.0 1.05.2 1.05.2 1.0
1.01.0
7.0 1.010.7 2.0
1.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.05
4.84.95.05.25.55.65.75.84.95.15.35.65.25.25.35.45.65.76.06.26.46.77.07.07.07.57.88.28.38.59.09.510.314.4
Current ( A)
WMR20D680K
WMR20D560KWMR20D470K
WMR20D390K
WMR20D330K
WMR20D270K
WMR20D220K
WMR20D180L
1 2 3 4 5-6 -5 -4 -3 -2 -110 10 10101010101010101010
1098765
20
30
40
50
60708090
100
400
300
200
Max.Leakage Current Max.Clamping Voltage
Vo
lta
ge
(V
)
0 20 100 1000
Impulse Width ( us)
10000
400300
200
100
504030
20
10
43
2
1
Imp
uls
e C
urr
en
t (
A )
500
5
1000
2000
WANMING ELECTRONIC CO.,LTD.20
2 times: 5 min. Interval up to 10 times: 2 min. Intervalup to 10 times: 10 se . intervalc6
1 Time2 Times
10 Times
2
10 Times
10 Times
3
10 Times
4
10 Times
5
10 Times6
WMR VARISTORS
2000
1000900800700
600
500
300
200
10090807060
50
40
30
400
1 2 3 4 5-6 -5 -4 -3 -2 -110 10 10101010101010101010
Current ( A)
0
WMR20D471KWMR20D431KWMR20D391KWMR20D361KWMR20D331KWMR20D301KWMR20D271KWMR20D241KWMR20D221KWMR20D201KWMR20D181KWMR20D151KWMR20D121KWMR20D101K
WMR20D820K
150
Max.Leakage Current
Max.Clamping Voltage
Vo
lta
ge
(V
)
2000
1000900800
700
600
500
300
200
400
1 2 3 4 5-6 -5 -4 -3 -2 -110 10 10101010101010101010
0
WMR20D112KWMR20D102KWMR20D911KWMR20D821KWMR20D781KWMR20D751KWMR20D681KWMR20D621KWMR20D561KWMR20D511K
5000
4000
3000
WMR20D182K Max.Leakage Current
Max.Clamping Voltage
Vo
lta
ge
(V
)
20 100 1000
Impulse Width ( us)
10000
400
200
100
6080
40
20
10
43
2
1
Imp
uls
e C
urr
en
t (
A )
600800
1000
2000
70006000500040003000
20 100 1000
Impulse Width ( us)
10000
400
200
100
6080
40
20
10
43
2
1
Imp
uls
e C
urr
en
t (
A )
600800
1000
2000
70006000500040003000
Typical Characteristics
Voltage vs. Current
WMR20D820K to WMR20D471K Impulse Lifetime Ratings
WMR20D820K to WMR20D471K
WMR20D511 to WMR20D182K WMR20D511 to WMR20D182K
WANMING ELECTRONIC CO.,LTD.21
2 times: 5 min. Interval up to 10 times: 2 min. Intervalup to 10 times: 10 se . intervalc6
1 Time2 Tim
es10 Times
2
10 Times
10 Times
3
10 Times
4
10 Times
5
10 Times
6
2 times: 5 min. Interval up to 10 times: 2 min. Intervalup to 10 times: 10 se . intervalc6
1 Time2 Tim
es
10 Times
2
10 Times
10 Times
3
10 Times
4
10 Times
5
10 Times
6
WMR VARISTORS
25D SeriesRatings and CharacteristicsOperating Temperature Range : -40 to 85Storage
Temperature Range :-40 to 125Temperature Coefficient Of Varistor Voltage : 0 to -0.05%/
D
F
T
H
a
20
.0 m
in.
d
Varistor Voltage
V 1mA (V) AC rms (V)
DC(V)
1time (A)
2times (A)
@1KHz(pF)
Part No.
MaximumAllowable Voltage
Clamping Voltage (max.)
Energy10/1000us
TypicalCapacitance(Reference)
200 (185-225)
220 (198-242)
240 (216-264)
270 (243-297)
300 (270-330)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
620 (558-682)
680 (612-748)
750 (675-825)
780 (702-858)
820 (738-902)
130
140
150
175
190
210
230
250
275
300
320
350
385
420
460
485
510
550
625
680
170
180
200
225
250
275
300
320
350
385
415
460
505
560
615
640
670
745
825
895
V 150 A (V)10/1000 us
(J )
2ms
(J )
340
360
395
455
500
550
595
650
710
775
845
920
1025
1120
1240
1290
1355
1500
1650
1815
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
190.0
200.0
220.0
255.0
275.0
300.0
330.0
360.0
380.0
440.0
440.0
440.0
440.0
460.0
510.0
530.0
570.0
620.0
685.0
770.0
140.0
150.0
160.0
180.0
200.0
220.0
240.0
260.0
280.0
300.0
300.0
300.0
300.0
320.0
350.0
360.0
380.0
430.0
460.0
500.0
3200
3900
2650
2400
2100
1900
1750
1600
1500
1400
1250
1150
1050
950
850
850
800
700
650
600
(W)
Rated Power
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
MaximunPeak Current (8/20us)
WMR-25D201K
WMR-25D221K
WMR-25D241K
WMR-25D271K
WMR-25D301K
WMR-25D331K
WMR-25D361K
WMR-25D391K
WMR-25D431K
WMR-25D471K
WMR-25D511K
WMR-25D561K
WMR-25D621K
WMR-25D681K
WMR-25D751K
WMR-25D781K
WMR-25D821K
WMR-25D911K
WMR-25D102K
WMR-25D112K
Dimensions in mm
Part No.
WMR-25D201KWMR-25D221KWMR-25D241KWMR-25D271KWMR-25D301KWMR-25D331KWMR-25D361KWMR-25D391KWMR-25D431KWMR-25D471KWMR-25D511KWMR-25D561KWMR-25D621KWMR-25D681KWMR-25D751KWMR-25D781KWMR-25D821KWMR-25D911KWMR-25D102KWMR-25D112K
D max. T max. F H max. a d
30.030.030.030.030.030.030.030.030.030.030.030.030.030.030.030.030.030.030.030.0
10.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.010.0 1.0
33.033.033.033.033.033.033.033.033.033.033.033.033.033.033.033.033.033.033.033.0
1.9 1.02.2 1.02.2 1.02.4 1.02.4 1.02.7 1.02.9 1.03.2 1.03.4 1.03.9 1.04.0 1.04.4 1.04.9 1.05.2 1.05.2 1.05.3 1.05.6 1.06.2 1.06.8 1.07.9 1.0
1.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.051.0 0.05
5.45.55.65.85.96.16.46.69.97.27.27.27.78.08.48.58.79.29.710.3
WANMING ELECTRONIC CO.,LTD.22
WMR VARISTORS
910 (819-1001)
1000 (900-1100)
1100 (990-1210)
Available Standard Lead Configurations
Lead typel 1 : Straight long lead ( Lead style: A )
Dmax.
e m
ax
.
F 1
ø d 0.05
LT max.
D max.T max.
Ld
F
Lead typel 2 : Straight short lead ( Lead style: B )
Lead typel 3 : inside ( Lead style: C )crimped long lead
L
d 0.05
A1.5
F 1.5
T max.Dmax.
Lead typel 4 : inside kink short lead ( Lead style: D )
A
1.5
LA
1.5
F 1.5
Dmax.T max.
Lead typel 5 : Outside crimped long lead ( Lead style: E ) Lead typel 6 : Outside crimped short lead ( Lead style: F )
A1
L
d 0.05
F 1.5
T max.Dmax.
A1
L
F 1.5
T max.Dmax.
WANMING ELECTRONIC CO.,LTD.23
WMR VARISTORS
Available Standard Lead Configurations
Lead typel 7 : Verrtical crimped long lead ( Lead style: H ) Lead typel 8 : Verrtical crimped short lead ( Lead style: K )
4m
ax.
LF
D
ø d
0.05
T
4m
ax.
TD max.
d
F
Lead typel 9 : Double crimped snap in ( Lead style: N )
+0.2 -0.1
P2+0.2 -0.1
L+
1.5
-0
H
+0.3
-0
.3
F 1.5
A1.5
d 0.05
Co
ati
ng
on
le
ad
s
ha
ll n
ot
ex
ten
d
this
lin
e
Po
int
of
su
pp
ort
on
p
rin
ted
ca
rdb
oa
rd
P1
D max.
WANMING ELECTRONIC CO.,LTD.24
WMR VARISTORS
SD
PP2
P1
L
P0 D0
W
W1
W0
W2
H0
e
dF
P2 P D
P1
S
F
P0
d
e
W0 W
1
W
W2
H0
L
D0
Taping Specification
Itme Series
Pitch of sprocket hole
Pitch of component
Lead spacing
Length from hole center to component center
Carrier tape width
Length from hole center t o lead
Body diameter
Deviation along tape,left or right
Position of sprocket hole
Lead distance between reference
and bottom planes
Protrusion length
Diameter of sprocket hole
Lead diameter
Total tape thickness
Total thickness, tape and lead wire
Body thickness
Portion to cut in case of defect
Hold down tape width
Hold down tape position
Coating extension on lead
Deviation across tape
P0
P
F
W
P1
D
S
W1
H
H0
D0
D
t1
t2
T
L
W0
W2
E
h1
P2
h2
25.4
6.35 1.3
3.85 0.7
12.7 0.3
7.5 1.0
8.95 1.0
See the individual product specification
0 2.0
18.0 0.5
9.0 0.5
18.0+2.0-0
20.0+1.5-1.0
+0.5 to -1.0
4.0 0.1
0.6 0.05
1.5 max.
11.0+0-1.0
0.6 0.3
11.5 min.
1.5 1.5
3.0 max.(Vertical crimp type:Up to the end of crimp)
(In mm)
1.0 max.
12.7
12.7 0.3
5.0+0.8-0.2
12.7 1.3
See the individual roduct specification
12.7mm pitch/ lead spacing 5 mm taping
12.7mm pitch/ lead spacing 7.5 mm taping
( packaging code : N2)
( packaging code : N3 )
25.4 mm pitch/ lead spacing 10 mm taping
( packaging code : N7 )
WANMING ELECTRONIC CO.,LTD.25
WMR VARISTORS
05D Series\07D Series\10D Series 10D Series\14D Series\20D Series
Performance Characteristics
Characteristics Test Methods/Description Specifications
Standard TestCondition
Envirommental conditions under which every measuring is done without doubt on the measuring results. Unless specified, thetemperature, andrelative humidity should be 5 to 35 and 45 to 85% RH.
Varistor VoltageThe voltage between two terminals with the specified measuring current CmA DC applied is called Vc or VcmA , the measurementshall be made as fast as possibleto avoid heat affection.
Maximum Allowable Voltage
The maximum sinusoidal RMS voltage or maximum DC voltage that can be applied continuously in the specified environmental temperature range.
Clamping Voltage
The maximum clamping voltage two terminals with the specified standard Impulse current lp (8/20us) illustrated below applied
Maximum PeakCurrent(Withstand-ing Surge Current)
The maximum current within the varistor voltage change of 10% with a standard impulse current of 8 20us is applied two times with an interval of 5 minutes.
Maximum Energy
Rated Power
Capacitance
Temperature
Coefficient of
Varistor Voltage
The maximum current within the varistor voltage change of 10% when one impulse of 10/1000us msec is applied.
The maximum power that can be applied within the specified ambient temperature.
Capacitance ahall be measured at 1kHz 10% 1Vrms max.(1MHz 20 2 .10% below 100pF), 0V bias and
VcmA at 85 - VcmA at 25
VcmA at 25X X
1
60100(%/ ) 0 to -0.05%/ max.
To meet the specified value
10090
50
100
8 us20us
Cu
rre
nt(
%)
Time
The maximum current within the varistor voltage change of 10% with a single standard impulse current of 8 20us is applied.
2 times
1 time
Withstanding Voltage(Body Insulation)
The specified voltage shall be applied between both terminals of the specimen connected together and metal foil closely wrapped round its body for 1 minute.
Classification (Nominal varistor voltage ) Test Voltage (AC)
1000Vrms
1500Vrms
V0.1mA, V1mA 330V
V0.1mA, V1mA 330V
The change of Vc shall be measued after the impulse current listed below is applied10000 or 100000 times continuously with the interval of 10 seconds at room temperature.
Impulse Life
Item
Times
Current
Impulse Life (I) Impulse Life (II)4X10 Times 5X10 Times
Impulse Current
WMR05D180L to WMR05D680K
WMR05D820K to WMR05D561K
WMR07D180L to WMR05D680K
WMR07D820K to WMR07D681K
WMR10D180L to WMR10D680K
WMR10D820K to WMR10D112K
WMR14D180L to WMR14D680K
WMR14D820K to WMR14D182K
WMR20D180L to WMR20D680K
WMR20D820K to WMR20D182K
0.5A (2ms)
20A (8/20us)
18A (8/20us)
50A (8/20us)
50A (8/20us)
100A (8/20us)
75A (8/20us)
150A (8/20us)
120A (8/20us)
200A (8/20us)
0.45A (2ms)
14A (8/20us)
12A (8/20us)
35A (8/20us)
35A (8/20us)
70A (8/20us)
45A (8/20us)
90A (8/20us)
55A (8/20us)
100A (8/20us)
No breakdown
To meet the specified value
VcmA / VcmA 10%
Ele
ctr
ica
l
WANMING ELECTRONIC CO.,LTD.25
WMR VARISTORS
Performance Characteristics
Characteristics Test Methods/Description Specifications
VcmA / VcmA 10%
After gradually applying the force specified below and keeping the unit fixed for 10 seconds, the terminal shall be visually examined for any damage.
The unit shall be secured with its terminal kept vertical and the force specified below be applied in the axial direction.The terminal shall gradually be bent by 90 in one direction, then 90 in theopposite direction, and again back to the original position.The damage of the terminal shall be visually examined.
Vibration
After repeatedly applying a single harmonic vibration (amplitude:0.75mm)double amplitude: 1.5mm with 1 minute vibration frequency cycles(10Hz to 55Hz to 10Hz) to each of three perpendicular directions for 2 hoursThereafter. the unit shall be visually examined.
SolderabilityAfter dipping the terminals to a depth of approximately 3 mm from the body in a soldering bath of 235 5 for 2 0.5 seconds, the terminal shall bevisually examined.
Approximately 95% of theterminals shall be covered with solder uniformly.
Robustness of Terminations(Bending)
Resistance to Soldering Heat
After each lead shall be dipped into a solder bath having a temperature 260 5 to a point 2.0 to 2.5 mm from the body of the unit, using shieldingboard(t=1.5mm), be held there for specified time (5 series:5 1 s and others: 10 1s), and then be stored at room temperature and humidity for 1 to 2 hours, The change of VcmA and mechanical damages are examined.
Terminal diameter
0.6mm
0.8mm
1.0mm
Force
9.8N (1.0kgf)
9.8N (1.0kgf)
19.6N(2.0kgf)
Terminal diameter
0.6mm
0.8mm
1.0mm
Force
4.9N (0.5kgf)
4.9N (0.5kgf)
9.8N(1.0kgf)
VcmA/VcmA 5%No rmarkable mechanical damage
No rmarkable mechanical damage
Robustness of Terminations(Tensile)
The apecimen shall be subjected to 40 2 90 to 95% RH for 1000 hourswithout load and then stored at room temperature and humidity for 1 to 2 hours. Thereafter, the change of VcmA shall be measured.
Temperature Cycle
The temperature cycle shown below shall be repeated five cycles and then stored at room temperature and humidity for 1 to 2 hours.The change of VcmA and mechanical damage shall be examined.
High Temperature Load/Dry Heat Load
Humidity(Steady State)
After being continuously applied the Maximum Allowable Voltage at 85 2for 1000 hours, the specimen shall be stored at room temperature and humidity for 1 to 2 hours. Thereafter, the change of VcmA shall be measured.
VcmA/VcmA 5%
High TemperatureStorage/Dry Heat
The specimen shall be subjected to 125 2 for 1000 hours in a thermostatic bath without load and then stored at room temperature and humidity for 1 to 2 hours. Thereafter, the change of VcmA shall be measured.
VcmA/VcmA 5%
1
2
3
4
Temperature( ) Period (minutes)Step
30 3
15 3
30 3
15 3
-40 3
Room temperature
125 2
Room temperature
VcmA/VcmA 5%No rmarkable mechanical damage
Damp Heat Load/Humidity Load
The specimen shall be subjected to 40 2 , 90 to 95% RH and the Maxim-um Allowable Voltage for 1000 hours and then stored at room temperature and humldity for 1 to 2 hours. Thereafter, the change of VcmA shall be measured.
VcmA / VcmA 10%
Low TemperatureStorage/Cold
The specimen shall be subjected to -40 2 without load for 1000 hours andthen stored at room temperature for 1 to 2 hours. Thereafter, the change of VcmA shall be measured.
VcmA / VcmA 5%
Me
ch
an
ica
lE
nv
iro
nm
en
tal
WANMING ELECTRONIC CO.,LTD.26
WMR VARISTORS
WANMING ELECTRONIC CO.,LTD.27
Precautions for Handling
1. Precautions for Safety
In the case that a WMR surge absorber( Type D) (hereafter referred to as the WMR, or productname) is used in mounted
condition, if an abnormality takes place because of peripheral conditions of the WMR(material,environments, power source
conditions, circuit conditions, etc. In equipment design), fire, electric shock, burn, or product failure may be caused. Since
the precautions for this product are described below, understand the content thoroughly before use. If questions are raised
about matters not covered, contact us.
1.Matters to be strictly observed1.1 Confirmation of performance ratings
Use the WMR within its rated range of performance such as the withstanding surge current, withstanding energy, impulse
life(surge life), average pluse power, and operating temperature range. If used outside the range, the WMR causes degradation
and element fracture, which may result in smoking and ignition.
1.2 To avoid accidents due to unexpected phenomena, take the following measures
1) In the event of fracture of the WMR, its pieces may scatter; hence, put the case or cover of the set product in place.
2) DO not install the WMR near combustible substances(polyvinyl chloride wires, resin moldings, etc.). If it is difficult to do, install
a nonflammable cover.
3) Across-the-line use
When the WMR is used across a line, put a normal-acting current fuse in series with the WMR
(Refer to ltem 2.1.1). (4)
4) Use between line to ground
(1) In the case that the WMR is used between a line to the ground, the short-circuit of the WMR may not blow the current fuse
because of grounding resistance,which may cause smoking and ignition of the WMR s exterior resin. As the measure
against it, install an earth leakage breaker on the power supply side of the WMR positon. If no earth leakage breaker is
installed, use a thermal fuse together with a current fuse in series.(Refer to Table 1.)
(2) In the case that the WMR is used between a live part to metal case, a electric shock may develop at a shortcircuit of the
WMR; hence, ground the metal case to the ground or keep it from the human body.
2.1 Pay attention to the following items to avoid the shortened life and failure of the WMR
1) Circuit conditions
(1) Select a WMR of which the maximum voltage including fluctuations in source voltage allows for the
maximumpermissible circuit voltage.(Refer to Table 1.)
(2) In cases that surges are intermittently applied at short intervals(for example, in the case that the voltage of the noise
simulator test is impressed), do not cause them to exceed the WMR s rated pluse power.
(3) Select a WMR recommended in Table 1.
<1>Across-the-line use
If possible, use a part No.marked with for 100VAC and 120VAC incase of voltage temporarity rises load
unblance of separately-wired loads, short between hot and neutral-line, open of neutral line in single-phase-
three-wired system, and due to resonance at switching for a capacitive, inductive load.
<2>Used between line to ground
Use a different Part No.from Across-the-line use as table 1,because of rasing voltage in case of Line to Ground
Fault .
Use a part No .marked with in table 1, in case of the insulation resistance test(500VDC) for equipment.
When using a part of the varistor voltage that the insulation efficiency examination can not be cleared, there is a
case where the surge absorber can be done by removing it from the circuit depending on the circuit condition(Refer
examination of Japan Domestic Safety Regulations).
Use a part No . Marked with table 1, in case of the withstanding voltage test(1000VAC or 1200VAC)for
equipment.
2.Application notes
WMR VARISTORS
WANMING ELECTRONIC CO.,LTD.28
(4) Concerning current fuse <1>It is recommended to select a WMR and the rated current of a current fuse as follows. Finally, confirm that the secondary disaster does not occur even if the WMR mounted on equipment breaks.
Standard Part No . WMR05D WMR07D WMR10D WMR14D WMR20D
Fuse rated current 3 A max. 5 A max. 7 A max. 10 A max.10 A max.
<2>The recommended fuse position is shown in table 1, Example of WMR application , however, if the load current of protected equipment is larger than that of the above recommended fuse rated current, install a current fuse at the position shown below.
Protected
Equipment
Power Source SideCurrent Fuse
WMR1
*Fuses shall use rated voltages appropriate for circuits.
(5) Concerning thermal fuse Set a thermal fuse to get high thermal conductivity with WMR.
Table 1 Example of WMR application
Measure against across-the -line surge Measure against surge across the line and between the line and ground
AC 3 phase
DC/AC Single phase
WMR1
Protected
Equipment
f:fuse
f
WMR3
Protected
Equipment
f WMR3
WMR3
f
f
f:fuse
WMR3
Protected
Equipment
f:fuse
fWMR2
Thermal.FuseThermal
coupling
DC/AC Single phase
WMR2
WMR3
Protected
Equipment
WMR4
Thermal
coupling Thermal.Fuse
f:fuse
f
f
f
AC 3 phase
Across-the-Line use Use between Line to ground
WMRSourcevoltage
Part No .
Type D
WMR1
AC 100V
AC 120V
WMR D201to
WMR D361WMR D241
toWMR D431
AC 200V
AC 220V
WMR D471to
WMR D621WMR D471
toWMR D621
WMR D511WMR D621
AC 240V
AC 380V WMR D821
WMR2
WMRSourcevoltage
Part No .
Type D
WMR4
AC 100V
AC 220V
AC 240V
AC 380V
WMR D471
WMR D511
WMR D621
WMR D821
WMR D182WMR2
AC 230VWMR D511
WMR D621
WMR D821
WMR D182
and more
and more
WMR D112
WMR D182and more
WMR VARISTORS
WANMING ELECTRONIC CO.,LTD.29
2) Operating environments
(1) The WMR is designed to use indoors. Do not use it exposed outdoors.(2) Do not use the WMR in places exposed to temperatures beyond the operating temperture range, such as places exposed to sunlight and vicinities of heating equipment.(3) Do not use the WMR in places exposed to high temperatures and high humidities, such as places exposed directly to rain, wind, and vapor.(4) Do not use the WMR in dusty and salty places and atmospheres polluted by corrosive gases.
3) Processing conditions
(1) DO not wash the WMR by such solvents(thinner, acetone, etc.)as deteriorate its exterior resin.(2) Do not apply to the WMR as strong vibration, shock(by falling,etc.),and pressure as crack its exterior resin and element.
(3) When coating the WMR with resin(including molding), do not use such resin.(4) Do not bend the WMR type D lead wires at the position close to its WMR type D exterior resin, or apply external force to the position.(5) When soldering the WMR lead wires, do in the following recommendation condition and do not melt the solder and insulating materials constituting the WMR.
Soldering Method RecommendedCondition
Attention Item
Type D
Flow soldering
Reflow soldering
260 , within 10sec. However; the 5 series parts is within 5 se
Type D is not Reflow soldering object part.
c.
1 When using at the thing except the condition that it is possible to suggest to the above, confirm that there is not a problem. The limit of the repair be once and go in solder temperature within 350 and moreover within 3 seconds.2 Profile be careful because there is a margin of error in the way of measuring.3 The temperature depend on the size and the package density of the substrate. Therefore, confirm every kind of the substrate.
Soldering temperature-time profile to recommendFlow soldering
Tem
pe
ratu
re(
)
0
50
100
150
200
250
300260
Soldering260 max.
A
2s max.
Gradual cooling
A :50s( 5 series: 5s)
Flow soldering
Tem
pe
ratu
re(
)
260
Tem
pe
ratu
re(
)
250
240
230
220
210
2000 10 20 30 40 50 60
Rising temperaturePreheatingRising temperaturemain heatingGradual cooling
The nomal to preheating temperature140 to 160Preheating to 200(cf.The limits of resistance toreflow soldering heat)200 to 100
30 to 60 s60 to 120 s20 to 40 s
1 to 40 /s
4) Long-term storage (1)Do not store the WMR under high temperature and high humidities. Store it at temperature from room temperature to 40 and at humidity below 75%RH, and use it within two years. (2) Avoid atmospheres full of corrosive gases(hydrogen sulfide, sulfurous acid, chlorin, ammonia, etc.). (3) Avoid direct sunlight and dew condensation.
3. Notices
3.1 In cases that the WMR is used in equipment(aerospace equipment, medical equipment, etc.) Requiring extremely high reliability, ask us for selection of part No.,protection coordination, etc. In advance.3.2 Note that we do not take any responsibility for faults and abnormalities resulting from the use not in conformity with the contents of entries in the delivery specification.3.3 There is possibility that the WMR will unexpectedly smoke or ignite because of abnormal rise of the circuit voltage and invasion of excessive surge. To prevent that accident from spreading over the equipment and not to expand the damege, use multiplex protection such as the adoption of frame-retardant materials for housing parts and structural parts.
WMR VARISTORS
Construction
Round varistor element as in 32D ,40D,53D
Rectangular varistor element as in 34S
Coating: epoxy resin,flame-retardant to UL 94 V-0
Bolt-holed strap terminals for screw fixing or soldering
UL and CSA recognized components
Large withstanding peak current (25 to 70kA,
80/20 uS , 1 time)
Maximum load capacity with minimum size
Recommended Applications
Power suppliers for OA,FA, telecommunication
or industrial equipment
Power strips
Transient voltage surge suppressor units
Features
High energy handling capability (210 to 2500 joules)
Common terminals for electrical connection and
mounting
Explanation of part Numbers
W M R D K
Wanming ( WMEC) Zinc Oxide Varistor
Element Size
40
34
40 mm
Type
Norminal Varistor Voltage
The first two dingits are significantfigures and the third one denotesthe number of zeros following.
Varistor Voltage Tolerance
K
L
10%
15%
34mm X 34mm
Strap VARISTORS
WANMING ELECTRONIC CO.,LTD.30
WMR VARISTORS
32D 40D 53D 34S Series
32 32 mm
53 53 mm
32D SeriesRatings and CharacteristicsOperating Temperature Range : -40 to 85Storage
Temperature Range :-40 to 125Temperature Coefficient Of Varistor Voltage : 0 to -0.05%/
Dimensions in mm ( not to scale)
D
H
25
73.5
8.5
min
.
a
TWMR-32D KSS
WMR-32D KSV
Part Number
WMR-32D201K
WMR-32D241K
WMR-32D271K
WMR-32D331K
WMR-32D361K
WMR-32D391K
WMR-32D431K
WMR-32D471K
WMR-32D511K
WMR-32D621K
WMR-32D681K
WMR-32D751K
WMR-32D781K
WMR-32D821K
WMR-32D911K
WMR-32D951K
WMR-32D102K
WMR-32D112K
D max. H max. T max.a
Terminal style
6.5
6.5
6.6
6.9
7.1
7.3
7.5
7.8
8.0
8.7
9.0
9.4
9.6
9.8
10.4
10.6
11.2
11.8
4.1 1.0
4.2 1.0
4.4 1.0
4.8 1.0
5.0 1.0
5.2 1.0
5.4 1.0
5.6 1.0
6.0 1.0
6.5 1.0
7.3 1.0
7.5 1.0
7.8 1.0
8.2 1.0
8.5 1.0
9.5 1.0
9.8 1.0
10.5 1.0
5.7 1.0
5.4 1.0
5.2 1.0
5.0 1.0
4.6 1.0
4.4 1.0
4.1 1.0
3.9 1.0
4.5 1.0
3.9 1.0
3.6 1.0
3.3 1.0
3.1 1.0
2.9 1.0
2.5 1.0
2.3 1.0
2.0 1.0
1.8 1.0
38 44
SS SV
7
3.5
83
.5
a
D
H
25
18
T
0.5
Varistor Voltage
V 1mA (V) AC rms (V)
DC(V)
1time (A)
2times (A)
@1KHz(pF)
Part No.
MaximumAllowable Voltage
Clamping Voltage (max.)
Energy 2ms
TypicalCapacitance(Reference)
200 (185-225)
240 (216-264)
270 (243-297)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
620 (558-682)
680 (612-748)
750 (675-825)
780 (702-858)
820 (738-902)
910 (819-1001)
1000 (900-1100)
1100 (990-1210)
130
150
175
210
230
250
275
300
320
350
385
420
460
485
510
550
625
680
170
200
225
275
300
320
350
385
415
460
505
560
615
640
670
745
825
895
V 200 A (V) (J )
340
395
455
550
595
650
710
775
845
920
1025
1120
1240
1290
1355
1500
1650
1815
WMR-32D201K
WMR-32D241K
WMR-32D271K
WMR-32D331K
WMR-32D361K
WMR-32D391K
WMR-32D431K
WMR-32D471K
WMR-32D511K
WMR-32D621K
WMR-32D681K
WMR-32D751K
WMR-32D781K
WMR-32D821K
WMR-32D911K
WMR-32D951K
WMR-32D102K
WMR-32D112K
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
210
240
255
300
315
330
360
380
430
470
495
520
550
580
620
650
685
750
5200
5100
4800
4300
3900
3200
3100
2800
2700
2400
2200
2000
1900
1800
1300
1200
1100
1000
MaximunPeak Current (8/20us)
WANMING ELECTRONIC CO.,LTD.31
WMR VARISTORS
40D SeriesRatings and CharacteristicsOperating Temperature Range : -40 to 85Storage
Temperature Range :-40 to 125Temperature Coefficient Of Varistor Voltage : 0 to -0.05%/
Varistor Voltage
V 1mA (V) AC rms (V)
DC(V)
1time (A)
2times (A)
@1KHz(pF)
Part No.
MaximumAllowable Voltage
Clamping Voltage (max.)
Energy 2ms
TypicalCapacitance(Reference)
200 (185-225)
240 (216-264)
270 (243-297)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
620 (558-682)
680 (612-748)
750 (675-825)
780 (702-858)
820 (738-902)
910 (819-1001)
1000 (900-1100)
1100 (990-1210)
130
150
175
210
230
250
275
300
320
350
385
420
460
485
510
550
625
680
170
200
225
275
300
320
350
385
415
460
505
560
615
640
670
745
825
895
V 250 A (V) (J )
WMR-40D201K
WMR-40D241K
WMR-40D271K
WMR-40D331K
WMR-40D361K
WMR-40D391K
WMR-40D431K
WMR-40D471K
WMR-40D511K
WMR-40D621K
WMR-40D681K
WMR-40D751K
WMR-40D781K
WMR-40D821K
WMR-40D911K
WMR-40D951K
WMR-40D102K
WMR-40D112K
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
310
360
390
460
475
490
550
600
640
720
750
780
820
900
960
1000
1055
1155
340
395
455
550
595
650
710
775
845
1025
1120
1240
1290
1355
1500
1570
1650
1815
8400
8000
7600
6700
6200
5100
4900
4300
4200
3800
3500
3200
3000
2900
2200
2000
1800
1600
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
MaximunPeak Current (8/20us)
Dimensions in mm ( not to scale)
D
H
25
73.5
8.5
min
.
a
T
Part Number
WMR-40D201K
WMR-40D241K
WMR-40D271K
WMR-40D331K
WMR-40D361K
WMR-40D391K
WMR-40D431K
WMR-40D471K
WMR-40D511K
WMR-40D621K
WMR-40D681K
WMR-40D751K
WMR-40D781K
WMR-40D821K
WMR-40D911K
WMR-40D951K
WMR-40D102K
WMR-40D112K
D max. H max. T max.a
Terminal style
6.5
6.5
6.6
6.9
7.1
7.3
7.5
7.8
8.0
8.7
9.0
9.4
9.6
9.8
10.4
10.6
11.2
11.8
4.1 1.0
4.2 1.0
4.4 1.0
4.8 1.0
5.0 1.0
5.2 1.0
5.4 1.0
5.6 1.0
6.0 1.0
6.5 1.0
7.3 1.0
7.5 1.0
7.8 1.0
8.2 1.0
8.5 1.0
9.5 1.0
9.8 1.0
10.5 1.0
5.7 1.0
5.4 1.0
5.2 1.0
5.0 1.0
4.6 1.0
4.4 1.0
4.1 1.0
3.9 1.0
4.5 1.0
3.9 1.0
3.6 1.0
3.3 1.0
3.1 1.0
2.9 1.0
2.5 1.0
2.3 1.0
2.0 1.0
1.8 1.0
45 50
WMR-40D KSS
WMR-40D KSV
SS SV
7
3.5
83
.5
a
D
H
25
18
T
0.5
WANMING ELECTRONIC CO.,LTD.32
WMR VARISTORS
53D SeriesRatings and CharacteristicsOperating Temperature Range : -40 to 85Storage
Temperature Range :-40 to 125Temperature Coefficient Of Varistor Voltage : 0 to -0.05%/
Varistor Voltage
V 1mA (V) AC rms (V)
DC(V)
1time (A)
2times (A)
@1KHz(pF)
Part No.
MaximumAllowable Voltage
Clamping Voltage (max.)
Energy 2ms
TypicalCapacitance(Reference)
200 (185-225)
240 (216-264)
270 (243-297)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
620 (558-682)
680 (612-748)
750 (675-825)
780 (702-858)
820 (738-902)
910 (819-1001)
1000 (900-1100)
1100 (990-1210)
130
150
175
210
230
250
275
300
320
350
385
420
460
485
510
550
625
680
170
200
225
275
300
320
350
385
415
460
505
560
615
640
670
745
825
895
V 200 A (V) (J )
WMR-53D201K
WMR-53D241K
WMR-53D271K
WMR-53D331K
WMR-53D361K
WMR-53D391K
WMR-53D431K
WMR-53D471K
WMR-53D511K
WMR-53D621K
WMR-53D681K
WMR-53D751K
WMR-53D781K
WMR-53D821K
WMR-53D911K
WMR-53D951K
WMR-53D102K
WMR-53D112K
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
490
570
630
680
730
880
950
1000
1100
1300
1500
1600
1650
1800
2000
2100
2200
2500
340
395
455
550
595
650
710
775
845
1025
1120
1240
1290
1355
1500
1570
1650
1815
15000
12500
11000
9000
8500
7500
7000
6500
6000
5000
4500
4000
3900
3700
3300
3200
3000
2700
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
MaximunPeak Current (8/20us)
Dimensions in mm ( not to scale)
D
H
25
73.5
8.5
min
.
a
T
Part Number
WMR-53D201K
WMR-53D241K
WMR-53D271K
WMR-53D331K
WMR-53D361K
WMR-53D391K
WMR-53D431K
WMR-53D471K
WMR-53D511K
WMR-53D621K
WMR-53D681K
WMR-53D751K
WMR-53D781K
WMR-53D821K
WMR-53D911K
WMR-53D951K
WMR-53D102K
WMR-53D112K
D max. H max. T max.a
Terminal style
7.2
7.2
7.2
7.5
7.8
8.0
8.3
8.5
8.7
9.0
9.3
9.5
9.7
10.1
10.5
10.8
11.5
12.0
4.4 1.0
4.4 1.0
4.6 1.0
5.0 1.0
5.1 1.0
5.4 1.0
5.8 1.0
5.9 1.0
6.2 1.0
6.8 1.0
7.5 1.0
7.8 1.0
8.1 1.0
8.4 1.0
8.7 1.0
10.0 1.0
10.5 1.0
11.0 1.0
5.7 1.0
5.4 1.0
5.2 1.0
5.0 1.0
4.6 1.0
4.4 1.0
4.1 1.0
3.9 1.0
4.5 1.0
3.9 1.0
3.6 1.0
3.3 1.0
3.1 1.0
2.9 1.0
2.5 1.0
2.3 1.0
2.0 1.0
1.8 1.0
60 65
WMR-53D KSS
WMR-53D KSV
SS SV
7
3.5
83
.5
a
D
H
25
18
T
0.5
WANMING ELECTRONIC CO.,LTD.33
34S SeriesRatings and CharacteristicsOperating Temperature Range : -40 to 85Storage
Temperature Range :-40 to 125Temperature Coefficient Of Varistor Voltage : 0 to -0.05%/
Varistor Voltage
V 1mA (V) AC rms (V)
DC(V)
1time (A)
2times (A)
@1KHz(pF)
Part No.
MaximumAllowable Voltage
Clamping Voltage (max.)
Energy 2ms
TypicalCapacitance(Reference)
200 (185-225)
220 (198-242)
240 (216-264)
270 (243-297)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
620 (558-682)
680 (612-748)
750 (675-825)
780 (702-858)
820 (738-902)
910 (819-1001)
950 (855-1045)
1000 (900-1100)
1100 (990-1210)
130
140
150
175
210
230
250
275
300
320
350
385
420
460
485
510
550
575
625
680
170
180
200
225
275
300
320
350
385
415
460
505
560
615
640
670
745
765
825
895
V 300 A (V) (J )
340
360
395
455
550
595
650
710
775
845
920
1025
1120
1240
1290
1355
1500
1570
1650
1815
WMR-34S201K
WMR-34S221K
WMR-34S241K
WMR-34S271K
WMR-34S331K
WMR-34S361K
WMR-34S391K
WMR-34S431K
WMR-34S471K
WMR-34S511K
WMR-34S561K
WMR-34S621K
WMR-34S681K
WMR-34S751K
WMR-34S781K
WMR-34S821K
WMR-34S911K
WMR-34S951K
WMR-34S102K
WMR-34S112K
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
30000
30000
30000
30000
30000
30000
30000
30000
30000
30000
30000
30000
30000
30000
30000
30000
30000
30000
30000
30000
310
330
360
390
410
460
490
550
600
640
710
800
910
980
1020
1100
1150
1200
1250
1350
6800
6200
5700
5000
4100
3800
3500
3200
2900
2700
2400
2200
2000
1800
1750
1650
1500
1430
1360
1250
MaximunPeak Current (8/20us)
Part Number
WMR-34S201K
WMR-34S221K
WMR-34S241K
WMR-34S271K
WMR-34S331K
WMR-34S361K
WMR-34S391K
WMR-34S431K
WMR-34S471K
WMR-34S511K
WMR-34S561K
WMR-34S621K
WMR-34S681K
WMR-34S751K
WMR-34S781K
WMR-34S821K
WMR-34S911K
WMR-34S951K
WMR-34S102K
WMR-34S112K
D max. H max. T max.a
Terminal style
6.5
6.5
6.6
6.7
7.0
7.2
7.4
7.6
7.9
8.0
8.3
8.7
9.0
9.4
9.6
9.8
10.4
10.6
11.2
11.8
4.4 1.0
4.4 1.0
4.6 1.0
5.0 1.0
5.1 1.0
5.4 1.0
5.6 1.0
5.8 1.0
6.2 1.0
6.4 1.0
6.8 1.0
6.9 1.0
7.3 1.0
7.8 1.0
8.2 1.0
8.4 1.0
8.7 1.0
8.9 1.0
9.2 1.0
9.4 1.0
5.7 1.0
5.5 1.0
5.4 1.0
5.2 1.0
5.0 1.0
4.6 1.0
4.4 1.0
4.1 1.0
3.9 1.0
4.5 1.0
4.2 1.0
3.9 1.0
3.6 1.0
3.3 1.0
3.1 1.0
2.9 1.0
2.5 1.0
2.3 1.0
2.0 1.0
1.8 1.0
38 45
WMR-53D KSS
WMR-53D KSV
SS SV
3.5
7
3.5
8
a
4.5
min
.
D
H 39
ma
x.
T
25
0.5
Dimensions in mm ( not to scale)
25
D
52
m
ax.
7 m
in.
39
ma
x
a
7 3.5
T
WANMING ELECTRONIC CO.,LTD.34
WMR VARISTORS
Performance Characteristics 32D 40D 53D 34S
Characteristics Test Methods/Description Specifications
Standard TestCondition
Electrcal characteristics shall be measured at follwing conditions(Temperature : 5 to 35 , Humidity:85%).
Varistor VoltageThe voltage between two terminals with the specified measuring current CmA DC applied is called Vc or VcmA , the measurementshall be made as fast as possibleto avoid heat affection.
Maximum Allowable Voltage
The maximum sinusoidal wave voltage (rms) or the maximum DC voltage that can be applied continuously .
Clamping Voltage The maximum clamping voltage between two terminals with the specified standard Impulse current (8/20us) .
Maximum PeakCurrent
The maximum current within the varistor voltage change of 10% with the standard impulse current ( 8/20us) applied two times with an interval of 5 minutes.
Maximum Energy
Rated Power
The maximum energy within the varistor voltage change of 10% when one impulse of 2 ms is applied.
The maximum power that can be applied within the specified ambient temperature.
The maximum current within the varistor voltage change of 10% with the standard impulse current (8/20us) applied one time.
2 times
1 time
To meet the specified value
Ele
ctr
ica
l
Vibration
After repeatedly applying a single harmonic vibration (amplitude:0.35mm):double amplitude: 0.7mm with 1 minute vibration frequency cycles(10Hz to 55Hz to 10Hz) to each of three perpendicular directions for 2 hoursThereafter. the unit shall be visually examined.
Solderability
Resistance to Soldering Heat
VcmA/VcmA 5%No rmarkable damage
No rmarkable damage
Robustness of Terminations(Tensile)
Me
ch
an
ica
l
After gradually applying the force of 19.6 N (2kgf) and keeping the unit fixedfor ten seconds, the terminal shall be visuall examined for any damage.
No rmarkable damage
After dipping the terminals to a depth of approximately 3 mm from the body in a soldering bath of 235 5 for 5.0 0.5 seconds, the terminal shall bevisually examined.
Approximately 95% of theterminals shall be covered new solder uniformly.
The terminal shall be dipped into a soldering bath having a temperature of 350 10 to a point 4.0 0.8 mm from the body of the unit and then be held there 3.0 0.5 seconds. The change of Vc and mechanical damage shal be examined.
VcmA / VcmA 10%
The apecimen shall be subjected to 40 2 90 to 95% RH for 1000 hourswithout load and then stored at room temperature and humidity for 1 to 2 hours. Thereafter, the change of Vc shall be measured.
Temperature Cycle
The temperature cycle shown below shall be repeated five cycles and then stored at room temperature and humidity for 1 to 2 hours.The change of Vc and mechanical damage shall be examined.
Dry Heat Load/High Temperature Load
Damp Heat/Humidity(Steady State)
After being continuously applied the Maximum Allowable Voltage at 85 2for 500 hours, the specimen shall be stored at room temperature and humidity for 1 to 2 hours. Thereafter, the change of Vc shall be measured.
VcmA/VcmA 5%
Dry Heat/High TemperatureStorage
The specimen shall be subjected to 125 2 for 500 hours in a thermostatic bath without load and then stored at room temperature and humidity for 1 to 2 hours. Thereafter, the change of Vc shall be measured.
VcmA/VcmA 5%
1
2
3
4
Temperature( ) Period (minutes)Step
30 3
3 max.
30 3
3 max.
85
-25 3
Room temperature
2
Room temperature
VcmA/VcmA 5%No rmarkable damageE
nv
iro
nm
en
tal
WANMING ELECTRONIC CO.,LTD.35
WMR VARISTORS
Construction
Disk- shaped varistor element,
potted in plastic housing
Housing and potting flame-retardant to UL 94V-0
Serew terminals M4 ( WMR-20B...40B)
Serew terminals M5 ( WMR-60B...80B)
Very large surge withstanding capability with a
compact size ( surge current capability up to 100kA)
Direct mounting on boards like a power distribution
board available
Low clamping voltage for better surge protection
Recommended Applications
Transistor, diode, IC, thyristor or triac semiconductor
protection
Surge protection in industrial power plant operations
Relay or electromagnetic valve surge absorption
Surge absorption applications in broadcasting,
communications devices, traffic/railroad,agricultural
facilities, waterworks
Surge protection of automatic control devices for
power distridution line
Features
Wide product range
Fast response to steep impulse voltage
Explanation of part Numbers
W M R B K
Wanming ( WMEC) Zinc Oxide Varistor
Element Size
20
25
32
40
60
80
34
20 mm
25 mm
32 mm
40 mm
60 mm
Type
Norminal Varistor Voltage
The first two dingits are significantfigures and the third one denotesthe number of zeros following.
Varistor Voltage Tolerance
K
L
10%
15%80 mm
34mm X 34mm
Bolck VARISTORS
WANMING ELECTRONIC CO.,LTD.36
WMR VARISTORS
20B SeriesRatings and CharacteristicsOperating Temperature Range : -40 to 85Storage
Temperature Range :-40 to 110Temperature Coefficient Of Varistor Voltage : 0 to -0.05%/
ISOM4
4.3
5
Dimensions in mm ( not to scale)
Part No.
H
W L
12
H
L
W
24
14
48 1 42 1 39 1
Varistor Voltage
V 1mA (V)AC rms (V)
DC(V)
1time (A)
2times (A) (W) @1KHz(pF)
Part No.
MaximumAllowable Voltage
Clamping Voltage (max.)
Rated Power
Energy (2ms)
TypicalCapacitance(Reference)
200 (185-225)
240 (216-264)
270 (243-297)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
620 (558-682)
680 (612-748)
750 (675-825)
780 (702-858)
820 (738-902)
910 (819-1001)
1000 (900-1100)
1100 (990-1210)
130
150
175
210
230
250
275
300
320
350
385
420
460
485
510
550
625
680
170
200
225
275
300
320
350
385
415
460
505
560
615
640
670
745
825
895
V 100 A (V) (J )
340
395
455
550
595
650
710
775
845
920
1025
1120
1240
1290
1355
1500
1650
1815
WMR-20B201K
WMR-20B241K
WMR-20B271K
WMR-20B331K
WMR-20B361K
WMR-20B391K
WMR-20B431K
WMR-20B471K
WMR-20B511K
WMR-20B561K
WMR-20B621K
WMR-20B681K
WMR-20B751K
WMR-20B781K
WMR-20B821K
WMR-20B911K
WMR-20B102K
WMR-20B112K
13000
13000
13000
13000
13000
13000
13000
13000
13000
10000
10000
10000
10000
10000
10000
10000
10000
10000
7000
7000
7000
7000
7000
7000
7000
7000
7000
7000
7000
7000
7000
7000
7000
7000
7000
7000
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
100
120
135
160
180
195
215
250
273
273
273
273
300
310
325
360
400
440
2000
1650
1500
1200
1100
1000
930
850
780
710
650
600
530
510
500
440
400
360
MaximunPeak Current (8/20us)
WMR-20B K
WANMING ELECTRONIC CO.,LTD.37
WMR VARISTORS
25B SeriesRatings and CharacteristicsOperating Temperature Range : -40 to 85Storage
Temperature Range :-40 to 110Temperature Coefficient Of Varistor Voltage : 0 to -0.05%/
32B SeriesRatings and CharacteristicsOperating Temperature Range : -40 to 85Storage
Temperature Range :-40 to 110Temperature Coefficient Of Varistor Voltage : 0 to -0.05%/
Varistor Voltage
V 1mA (V)AC rms (V)
DC(V)
1time (A)
2times (A) (W) @1KHz(pF)
Part No.
MaximumAllowable Voltage
Clamping Voltage (max.)
Withstanding Surge Current (8/20us)
Rated Power
Energy (2ms)
TypicalCapacitance(Reference)
200 (185-225)
240 (216-264)
270 (243-297)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
620 (558-682)
680 (612-748)
750 (675-825)
780 (702-858)
820 (738-902)
910 (819-1001)
1000 (900-1100)
1100 (990-1210)
130
150
175
210
230
250
275
300
320
350
385
420
460
485
510
550
625
680
170
200
225
275
300
320
350
385
415
460
505
560
615
640
670
745
825
895
V 200 A (V) (J )
340
395
455
550
595
650
710
775
845
920
1025
1120
1240
1290
1355
1500
1650
1815
WMR-32B201K
WMR-32B241K
WMR-32B271K
WMR-32B331K
WMR-32B361K
WMR-32B391K
WMR-32B431K
WMR-32B471K
WMR-32B511K
WMR-32B561K
WMR-32B621K
WMR-32B681K
WMR-32B751K
WMR-32B781K
WMR-32B821K
WMR-32B911K
WMR-32B102K
WMR-32B112K
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
210
240
255
300
315
330
360
380
430
470
495
520
550
580
620
650
685
750
5200
5100
4800
4300
3900
3200
3100
2800
2700
2400
2200
2000
1900
1800
1300
1200
1100
1000
Varistor Voltage
V 1mA (V)AC rms (V)
DC(V)
1time (A)
2times (A) (W) @1KHz(pF)
Part No.
MaximumAllowable Voltage
Clamping Voltage (max.)
Rated Power
Energy (2ms)
TypicalCapacitance(Reference)
200 (185-225)
240 (216-264)
270 (243-297)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
620 (558-682)
680 (612-748)
750 (675-825)
780 (702-858)
820 (738-902)
910 (819-1001)
1000 (900-1100)
1100 (990-1210)
130
150
175
210
230
250
275
300
320
350
385
420
460
485
510
550
625
680
170
200
225
275
300
320
350
385
415
460
505
560
615
640
670
745
825
895
V 150 A (V) (J )
340
395
455
550
595
650
710
775
845
920
1025
1120
1240
1290
1355
1500
1650
1815
WMR-25B201K
WMR-25B241K
WMR-25B271K
WMR-25B331K
WMR-25B361K
WMR-25B391K
WMR-25B431K
WMR-25B471K
WMR-25B511K
WMR-25B561K
WMR-25B621K
WMR-25B681K
WMR-25B751K
WMR-25B781K
WMR-25B821K
WMR-25B911K
WMR-25B102K
WMR-25B112K
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
14000
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
3200
2650
2400
1900
1750
1600
1500
1400
1250
1150
1050
950
850
850
800
700
650
600
140.0
160.0
180.0
220.0
240.0
260.0
280.0
300.0
300.0
300.0
300.0
320.0
350.0
360.0
380.0
430.0
460.0
500.0
MaximunPeak Current (8/20us)
WANMING ELECTRONIC CO.,LTD.38
WMR VARISTORS
34B / 40B SeriesRatings and CharacteristicsOperating Temperature Range : -40 to 85Storage
Temperature Range :-40 to 110Temperature Coefficient Of Varistor Voltage : 0 to -0.05%/
Dimensions in mm not to scale)
Part No.
H
W L
48 1 42 1 39 1
ISOM4
4.3
5
12
H
L
W
24
14
Varistor Voltage
V 1mA (V)AC rms (V)
DC(V)
1time (A)
2times (A) (W) @1KHz(pF)
Part No.
MaximumAllowable Voltage
Clamping Voltage (max.)
Rated Power
Energy (2ms)
TypicalCapacitance(Reference)
200 (185-225)
240 (216-264)
270 (243-297)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
620 (558-682)
680 (612-748)
750 (675-825)
780 (702-858)
820 (738-902)
910 (819-1001)
1000 (900-1100)
1100 (990-1210)
130
150
175
210
230
250
275
300
320
350
385
420
460
485
510
550
625
680
170
200
225
275
300
320
350
385
415
460
505
560
615
640
670
745
825
895
V 300 A (V) (J )
340
395
455
550
595
650
710
775
845
920
1025
1120
1240
1290
1355
1500
1650
1815
WMR-34B201K
WMR-34B241K
WMR-34B271K
WMR-34B331K
WMR-34B361K
WMR-34B391K
WMR-34B431K
WMR-34B471K
WMR-34B511K
WMR-34B561K
WMR-34B621K
WMR-34B681K
WMR-34B751K
WMR-34B781K
WMR-34B821K
WMR-34B911K
WMR-34B102K
WMR-34B112K
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
25000
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
310
360
390
460
475
490
550
600
640
720
750
780
820
900
960
1000
1055
1155
8400
8000
7600
6700
6200
5100
4900
4300
4200
3800
3500
3200
3000
2900
2200
2000
1800
1600
MaximunPeak Current (8/20us)
WMR-25B K
WMR-32B K
WMR-34B K
WMR-40B K
48 1 42 1 39 1
48 1 42 1 39 1
48 1 42 1 39 1
25B Series , 32B Series , 34B Series , 40B Series
WANMING ELECTRONIC CO.,LTD.39
WMR VARISTORS
60B SeriesRatings and CharacteristicsOperating Temperature Range : -40 to 85Storage
Temperature Range :-40 to 110Temperature Coefficient Of Varistor Voltage : 0 to -0.05%/
71
40
10
0
92
45
30
86
100
5
ISOM5
7
5
724
Varistor Voltage
V 1mA (V)AC rms (V)
DC(V)
1time (A)
2times (A) (W) @1KHz(pF)
Part No.
MaximumAllowable Voltage
Clamping Voltage (max.)
Rated Power
Energy (2ms)
TypicalCapacitance(Reference)
200 (185-225)
240 (216-264)
270 (243-297)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
620 (558-682)
680 (612-748)
750 (675-825)
780 (702-858)
820 (738-902)
910 (819-1001)
1000 (900-1100)
1100 (990-1210)
130
150
175
210
230
250
275
300
320
350
385
420
460
485
510
550
625
680
170
200
225
275
300
320
350
385
415
460
505
560
615
640
670
745
825
895
V 500 A (V) (J )
340
395
455
550
595
650
710
775
845
920
1025
1120
1240
1290
1355
1500
1650
1815
WMR-60D201K
WMR-60D241K
WMR-60D271K
WMR-60D331K
WMR-60D361K
WMR-60D391K
WMR-60D431K
WMR-60D471K
WMR-60D511K
WMR-60D561K
WMR-60D621K
WMR-60D681K
WMR-60D751K
WMR-60D781K
WMR-60D821K
WMR-60D911K
WMR-60D102K
WMR-60D112K
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
50000
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
490
570
630
680
730
880
950
1000
1100
1300
1500
1600
1650
1800
2000
2100
2200
2500
15000
12500
11000
9000
8500
7500
7000
6500
6000
5000
4500
4000
3900
3700
3300
3200
3000
2700
MaximunPeak Current (8/20us)
Dimensions in mm ( not to scale)
WANMING ELECTRONIC CO.,LTD.40
WMR VARISTORS
80B SeriesRatings and Characteristics
Operating Temperature Range : -40 to 85Storage
Temperature Range :-40 to 110Temperature Coefficient Of Varistor Voltage : 0 to -0.05%/
96 1
5
ISOM5
7
50 1
11
81
11
21
58
0.5
50
0.2
6.8
0.5
135 1
115 1 7
27.7 0.5
Varistor Voltage
V 1mA (V)AC rms (V)
DC(V)
1time (A)
2times (A) (W) @1KHz(pF)
Part No.
MaximumAllowable Voltage
Clamping Voltage (max.)
Rated Power
Energy (2ms)
TypicalCapacitance(Reference)
200 (185-225)
240 (216-264)
270 (243-297)
330 (297-363)
360 (324-396)
390 (351-429)
430 (387-473)
470 (423-517)
510 (459-561)
560 (504-616)
620 (558-682)
680 (612-748)
750 (675-825)
780 (702-858)
820 (738-902)
910 (819-1001)
1000 (900-1100)
1100 (990-1210)
130
150
175
210
230
250
275
300
320
350
385
420
460
485
510
550
625
680
170
200
225
275
300
320
350
385
415
460
505
560
615
640
670
745
825
895
V 800 A (V) (J )
340
395
455
550
595
650
710
775
845
920
1025
1120
1240
1290
1355
1500
1650
1815
WMR-80B201K
WMR-80B241K
WMR-80B271K
WMR-80B331K
WMR-80B361K
WMR-80B391K
WMR-80B431K
WMR-80B471K
WMR-80B511K
WMR-80B561K
WMR-80B621K
WMR-80B681K
WMR-80B751K
WMR-80B781K
WMR-80B821K
WMR-80B911K
WMR-80B102K
WMR-80B112K
100000
100000
100000
100000
100000
100000
100000
100000
100000
100000
100000
100000
100000
100000
100000
100000
100000
100000
70000
7
7
7
0000
0000
0000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
28000
21000
19000
17000
16000
14000
13000
12000
11500
11000
10000
9000
8500
7500
7000
6500
6000
5200
MaximunPeak Current (8/20us)
Dimensions in mm ( not to scale)
WANMING ELECTRONIC CO.,LTD.41
WMR VARISTORS
Performance Characteristics ( 20B 25B 34B/40B 60B , 80B)
Characteristics Test Methods/Description Specifications
Standard TestCondition
Electrcal characteristics shall be measured at follwing conditions(Temperature : 5 to 35 , Humidity:85%).
Varistor VoltageThe voltage between two terminals with the specified measuring current CmA DC applied is called Vc or VcmA , the measurementshall be made as fast as possibleto avoid heat affection.
Maximum Allowable Voltage
The maximum sinusoidal wave voltage (rms) or the maximum DC voltage that can be applied continuously .
Clamping VoltageThe maximum clamping voltage between two terminals with the specified standard Impulse current (8/20us) .
Maximum PeakCurrent
The maximum current within the varistor voltage change of 10% with the standard impulse current ( 8/20us) applied two times with an interval of 5 minutes.
Maximum Energy
Rated Power
The maximum energy within the varistor voltage change of 10% when one impulse of 2 ms is applied.
The maximum power that can be applied within the specified ambient temperature.
The maximum current within the varistor voltage change of 10% with the standard impulse current (8/20us) applied one time.
2 times
1 time
To meet the specified value
Ele
ctr
ica
l
Vibration
After repeatedly applying a single harmonic vibration (amplitude:0.75mm):double amplitude: 1.5mm with 1 minute vibration frequency cycles(10Hz to 55Hz to 10Hz) to each of three perpendicular directions for 2 hoursThereafter. the unit shall be visually examined.
Robustness of Terminations(Tensile)
Me
ch
an
ica
l After gradually applying the load of 49N (5kgf) and keeping the unit fixedfor ten seconds, in an direction ,the terminal shall be visuall examined for any damage.
No rmarkable damage
VcmA / VcmA 10%
The apecimen shall be subjected to 40 2 90 to 95% RH for 1000 hourswithout load and then stored at room temperature and humidity for 1 to 2 hours. Thereafter, the change of Vc shall be measured.
Temperature Cycle
The temperature cycle shown below shall be repeated five cycles and then stored at room temperature and humidity for 1 to 2 hours.The change of Vc and mechanical damage shall be examined.
Dry Heat Load/High Temperature Load
Damp Heat/Humidity(Steady State)
After being continuously applied the Maximum Allowable Voltage at 85 2for 500 hours, the specimen shall be stored at room temperature and humidity for 1 to 2 hours. Thereafter, the change of Vc shall be measured.
VcmA/VcmA 5%Dry Heat/High TemperatureStorage
The specimen shall be subjected to 110 3 for 500 hours in a thermostatic bath without load and then stored at room temperature and humidity for 1 to 2 hours. Thereafter, the change of Vc shall be measured.
VcmA/VcmA 5%
1
2
3
4
Temperature( ) Period (minutes)Step
30 3
3 max.
30 3
3 max.
85
-25 3
Room temperature
2
Room temperature
VcmA/VcmA 5%No rmarkable damageE
nv
iro
nm
en
tal
Temperature Coefficient of VaristorVoltage
Vc at 70 - Vc at 20
Vc at 20X X
1
50100(%/ )
Withstanding Voltage(Body Insulation)
The commercial frequency voltage of AC 2.5kV shall be applied betweenterminals and the bottom of the unit for one minute.
0 to -0.05%/ max.
No rmarkable damage
WANMING ELECTRONIC CO.,LTD.42
WMR VARISTORS
WANMING ELECTRONIC CO.,LTD.43
The WMR Transient/Surge Absorbers(hereafter referred to as The WMR Varistors ) may fail in a short-circuit
mode or in an open-circuit mode, when subjected to severe conditions of electrical, environmental and/or me-
chanical stresses beyond their specified Ratings and specified Conditions ,resulting in burnout, flaming or
glowing in the worst case.
Following Precautions for Safety and Application Notes shall be taken in your major consideration. If you have
a question about the Precautions for Handling , please contact our engineering section or factory.
1.1Operating Conditions
1.1.1 The WMR Varistors shall not be operated beyond
the specified Ratings and Environmental
Conditions in the Catalog or the Specifications to
prevent them from deterioration,breakdown,flaming
or glowing.
The WNR Varistors shall not be operated exceeding
the specified Maximum Allowable Voltage in the
Catalog or the Specification.
The WMR Varistors shall not be subjected to energy
levels above their specified Maximum Energy Ratings
in the Catalog or the Specifications.
In case of application to repeated surge/overvoltages,
the WMR Varistors shall not be subjected to surge currents
and energy levels above the specified maximum ratings
in Impulse Life Rating in the Catalog or the Specifications.
When surge/overvoltage are intermittently applied to the
WMR Varistors with short durations, the devices shall not be
operated beyond the specified. Rated Power in the
Catalog or the Specifications.
The WMR Varistors shall not be operated beyond the
specified Operating Temperature Range in the Catalog
or the Specifications.
It is recommended that the WNR Varistors, if not fused, shall
be located away from other combustible components.
1.1.2 The WMR Varistor shall be operated corrctly
under following conditions to prevent Varistors from
causing mechanical damages and ruptures and to protect
human from serious injuries;
The WNR Varistors shall not be operated exceeding the
specified Maximum Allowable Voltage Ratings in the
Catalog.
The WNR Varistors shall not be operated beyond the
Maximum Peak Current Ratings in the Catalog.
Some safety countermeasure such as a protective case
covering the Varistor is recommended, if necessary.
1.1.3 When the WMR Varistors are applied to between
a live part and a metallic chassis of equipment,
following safety countermeasures shall be taken to
protect human from electric shock.
A) The metallic chasdsis shall be earthed to the ground.
B) The live part shall be equipped with a protective
cover for preventing electric shock.
2.Application Notes
2.1 Protective Devices for Varistors
2.1.1 The WMR Varistors shall be protected from
serious accidents due to unexpected physical
phenomenor by following safety countermeasures.
In case of Across-the Line Use , the Wnr
Varistors shall be protected by connecting a
ground fault circuit interrupter of fusing in series
to the devices.(See Table 1).
In case of Line to Grond Use , the short-cir-
cuit of the Varistor may not blow the current
ype fuse due to the grounding resistance(be-
tween Line and Ground), which may cause flam-
ing or burnout of the devices in the worst case.
Following safety countermeasures(A or B) are
recommended;
A) Connecting a leakage current circuit breaker
in series to the Varistor to be protected.(See Table
1)
B) Use current type fuses and a thermal type fuse
which are thermally coupled each others.(See
Table 1)
Precautions for Handling
1. Precautions for Safety
WMR VARISTORS
WANMING ELECTRONIC CO.,LTD.44
2.2 Circuit Design 1
(Selection of Varistor Voltage Rating)
2.2.1 General Precautions In selection of Varistor Voltage Ratings for line
protection, following general precautions shall be
taken in your consideration;
(1)Maximum operating voltage shall be lower than
the specified Maximum Allowable Voltage of
the Varistor applied.
(2)Some reasonable margin is required against
fluctuation of the primary AC line Voltage where
the Varistor is applied for preventing mechanical
and/or electrical failures of the device.
2.2.2 Across-the-Line Use (Line to Line surge protection)
Select the WMR Varistors recommended in Table 1.
Notes: Because the primary line voltage temporarily
rises due to load unbalance of separately
wired loads, short circuit between the live line
and the nutral line or LC resonance at switching
for a capacitive load, WNR Varistors with * are
recommended for Ac120 V or 240 V applications.
(See Table 1)
2.2.3 Line to Ground Use
(Line to Ground Surge protection)
Select the WMR Varistors recommended in Table 1.
Notes: When 500 V insulatiion resistance test of the
circuits employing WMR Varistor is conducted,
the WMR Varistor shall be removed after getting
approval from the customer, or the WMR Varistor
* * with the Maximum Allowable voltage exceeding
to the text voltage shall be applied.(See Table 1)
When AC1000V or 1200V dielectric with standing
test is conducted, WMR Varistors shall be removed
after getting approval from the customer according
to the relevant regulations, or WMR Varistor * * *
with the Maximum Allowable Voltage exceeding to
the test voltage shal be applied.(See Table 1)
Fig . Alternative Fuse Location/placement
for Varistor Protection
2.4 Environmental Conditions (1)The WMR Varistors shall not be exposed
outdoors, because of being designed for indoors
use.
(2)The WMR Varistors shall not be operated beyond
the Specified Operating Temperature Range and
shall not be exposed to direct sunlight and heating
part of equipment.
(3)The WMR Varistors shall not be operated under
severe conditions of high temperatures and high
humidities such as places exposed to rain, wind
and vapor.
(4)The WMR Varistors shall be free from dust, salty
wind and atomospheres polluted by corrosive
gas.
2.5 Precautions for Assemblies and Handlings
2.5.1 Solvent Cleaning Organic solvents such as thinner and acetone etc.
Shall not be applied to the WMR Varistors for preventing
deterioration of the external coating or molding resin.
2.5.2 Abnormal Mechanical Stresses Abnormal mechanical stresses beyond the specified
values such as strong falling shocks, ribrations and
bending/pulling forces, shall be kept minimum to
preventmechanical/electrical
failures of the devices.
2.5.3 Plactic Molding If another plastic molding is applied to the WMR
Varistors on your option, the influences on reliability
of the WNR Varistors shall be carefully investigated in
you equipment.
2.6 Long Term Storage (1)The WMR Varistors shall not be stored under
severe conditions of high temperatures and high
humidities. Store them indoors under 40 max.
And 75% RH max. Use them within one year, if
stored beyond the limit, check the solderbility
before use.
(2) The WMR Varistors shall not be stored under
corrosive atomospheres such as hydrogen
sulfide, sulfurous acid, chlorine and ammonia.
(3) The WMR Varistors shall not be exposed to dircet
sunlight and shall not be stored under dew
formation.
2.7 Regarding to Safety Regulations of the
Varistors In case of applications to UL and CSA standards,
refer to Application Notes for UL and CSA Recog-
nized WMR Varistors
2.8 Parallel Capacitances of the WMR Varistors The WMR Varistors have relatively high capacitances
specified in the individual specifications, special
consideration shall be taken into account in
applications to high frequency transmission
lines or circuits.
2.3 Circuit Design 2 (Fusing Varistors)
2.3.1 When a line current of equipment is higher than
the recommended current rating of the fuse in
Table 2, the location of the fuse shall be arranged
according to Fig 2.
Protected
Equipment
Current Fuse
WMRVaristor
WMR VARISTORS
WANMING ELECTRONIC CO.,LTD.45
WMR3
Protected
Equipment
WMR4
A.C.3 phase
Thermal
coupling Thermal.Fuse
WMR3
Protected
Equipment
A.C.3 phase
f:fuse
f
f:fuse
f
f
f
WMR3
Protected
Equipment
f:fuse
f
WMR1
WMR2
Thermal.FuseThermal
coupling
WMR1
Protected
Equipment
D.C.A.C.Single phase
f:fuse
f
Across-the-Line/Line to Line Protection Line to Line and Line to Ground Protection
D.C.A.C.Single phase
Table 1. Application Examples
Co
nn
ecti
on
sS
ele
cti
on
Exa
mp
les
Typ
e B
Typ
e D
Across the Line Use/Line to Line Line to Ground Use
WMR Prat Number of WMRNominal
Line Voltage
WMR1WMR3
A.C.100 V
A.C.120 V
A.C.200 V to A.C.220 V
A.C.240 V
WMR D201WMR D241WMR D271*
WMR D241WMR D271*
WMR D471
WMR D511
WMR Prat Number of WMRNominal
Line Voltage
WMR2WMR4
A.C.200 V to A.C.220 V
A.C.240 V
WMR D471WMR D511WMR D821 to
WMR D511WMR D821 to
Across the Line Use/Line to Line Line to Ground Use
WMR Prat Number of WMRNominal
Line Voltage
WMR1WMR3
A.C.100 V
A.C.120 V
A.C.200 V to A.C.220 V
A.C.240 V
WMR B201WMR B241WMR B271*
WMR B241WMR B271*
WMR B471
WMR B511
WMR Prat Number of WMRNominal
Line Voltage
WMR2WMR4
A.C.200 V to A.C.220 V
A.C.240 V
WMR B471WMR B511WMR B821 to
WMR B511WMR B821 to
WMR VARISTORS