lv hrc fuses: din type · hrc fuse is the fuse element of high-grade copper. the important factors...

LV HRC Fuses: DIN TypeGeared up for any situation

Answers for Infrastructure.

Fuses are the fastest & simplest current

limiting devices. With a wide current

range, multiple voltage ratings and high

short circuit strength, Siemens 3NA fuses

are perfectly equipped for overcurrent

protection in buildings & industries. The

unique combi- indication enables the user

to view the fuse status, easily, even from a

distance. With Siemens fuses, protection is

easy, safe and reliable.

www.siemens.co.in

s

2

HRC FusesType 3NA3Introduction

LV HRC Fuses

During installations, when the HRCFuses are mounted on the fusebases or Switch Disconnector FuseUnits in panels above certainheight, it is very difficult to identifythe status of the fuse link; whetherhealthy or blown. This necessitatesrequirement of additional frontindication.

The combination indicator Fuse hastwo indicators as against one usedin conventional fuses. Oneindicator is on top cover platesimilar to conventional fuses andother indicator is at the centre ofthe ceramic body of the fuse link.This helps in clear identificationof status of fuse also from thefront.

3NA7 LV HRC Fuses are available in4 different sizes from 2 to 400A.The Size 3 fuses (315A -800A)continue to be with single indicatoron top. The main part of the LV

Short data description : 3NA7 LV HRC Fuses

Standards IS 13703 Part 2 Section 1(1993); IEC 60269-2

Dimensions IS 13703; IEC 60269-2

Operating class gG

Rated Voltage AC 500V* / DC 440V upto 630A (DC 250V for size 00)

AC 690V/DC 440V (DC 250V for size 00)

Rated Current Range 2A-800A, AC 500V

40A-500A, AC 690V

Rated Breaking Capacity AC 120kA / DC 25kA

Mounting position as desired but preferably vertical

Resistance to climate -30°C to +50°C at 95% relative humidity

HRC fuse is the fuse element ofhigh-grade copper. The importantfactors for conductivity are theresistance value per meter, thematerial thickness and thedimensional accuracy. Threeimportant criteria in the productionof the fuse elements are:

• Accurate cutting and punching

• Precise application of the solderdeposit

• Accurate and concentricinsertion of the fuse-element inthe fuse body.

Where several fuse elements areinvolved, these are fitted exactlyparallel to each other in the fusebody. This ensures adequatecooling of the individual arcs. Theprecision of the parallelarrangement can be verified byobserving the beads of moltenmetal after the fuse has respondedto short circuit. The fuse-elementmust not be too close to the wall of

the fuse body or otherwise therewill be no protective layer of sand.If the arc were to touch the wall ofthe fuse body, the fuse might burstor blow.

The fuse elements of 3NA7 & 3NA3fuses are of operating class gG. Theuse of silver-plated or pure silverfuse-elements is not required forphysical reasons.

Oxidation, also called scaling ofcopper, reduces the cross-sectionof the fuse-element. This occursonly at a temperature of approx.350°C. In the time/current rangewithin which a fuse operates,however, only temperatures of180°C to 240°C are attained. Hencesafe tripping is ensured with thisfuse element.

Advantages

• High quality of fuse

• Less stresses to downstreamequipments during short circuitdue to lower let through current

• Low power losses resulting inhigh economy and minimalheating.

• Safe and reliable breakingcapacity from the smallestoverload upto the largest short-circuit current.

• Finely graded selectivity level forthe optimum use of cable crosssections

• High resistance to ageing

• Constant characteristics evenunder different temperatureconditions

* 400A (Size II) and 800A, are rated at 415V AC

3

Applications

Fuses are primarily used for theprotection of cables andconductors against overload andshort-circuit currents, and are alsosuitable for the protection ofequipment. Some of the importantapplications are:

• Use in radial and ring networkswith high selectivity

• For back-up protection of MCBs

• For protection of motor circuitsin which operational short-termoverloads and short-circuitsoccur

• Short circuit protection forswitching devices such ascontactors and circuit-breakers

The field of application for fusesinclude industrial installations,power supply utilities, equipmentmanufacturers, switchboards andcontrol panels.

Selectivity

In an installation, as a rule, severalfuses are connected in series.Selectivity ensures that in anemergency, only the faulty circuitis disconnected, and not the entireoperation. Siemens fuses withoperating class gG for a ratedvoltage up to ~230V are mutuallyselective in the ratio 1:1.25. This isdue to the much lower tolerancerange, ±5% of the time/currentcharacteristics curve. The standardrequires a ratio limit of 1:1.6,which our fuses clearly exceed.The cable sizes due to the smallerrated currents can also bereduced.

Breaking capacity

The fuses distinguish themselveswith their high rated breakingcapacity of alteast 120kA which isachieved through:

• Fuse element design and themanufacturing process

• Precise positioning of fuseelement inside the fuse body

• Chemical purity, grain size anddensity of the quartz sand

• Resistance to pressure andtemperature change on theceramic fuse body

The basic requirements and circuitdata for the testing, i.e. voltage,load factor, switching angle etc. aredetailed in the international(IEC 60269) standards and Indianstandard IS 13703.

Current limitation

Along with a reliable rated breakingcapacity, the let through current offuse links can also have asignificant influence on theeconomy of an installation.

During the interruption of a short-ciruit by a fuse, the short-circuitcurrent also flows through theupstream fuses. The short-circuitcurrent is limited by the networkimpedance.

By the simultaneous melting of allnarrow parts of the fuse element,partial electrical arcs assure quickbreaking with greater currentlimitation. The current limitationis therefore, influencedsubstantially by the quality ofmanufacturing.

This strong current limitingproperty of 3NA7 protects thesystem for excessive loads.

Co-ordination for cable and lineprotection

To ensure co-ordination of fuseswith respect to cable and lineprotection during overload,according to DIN 0100 part 430,the following conditions apply:

(1) lB ≤ l

N ≤ l

z (Nominal current

range)

(2) l2 ≤ 1.45

x

lN

(Tripping range)

lB : Operating current of the circuit

lN

: Nominal current of selectedprotective device

lz : Permissible current loading

capacity at given operatingconditions for the cable or line

l2 : Tripping current of theprotective device underdetermined conditions (largetest current)

The factor 1.45 is an internationallyaccepted agreement betweenutilisation and level of protectionfor a conductor, when consideringthe disconnection limits and thepossible protective device (e.g.fuses).

Co-ordination for cable and lineprotection

Siemens fuse links of the operatingclass gG completely conform to thesupplementary part of the standardIEC 60269, the condition being:

“Disconnection with l2 = 1.45 x l

N

for the conventional continuoustest under the particular testrequirements according to thenamed supplementary part ofstandard IEC 60269”.

A direct co-ordination is thereforepossible.

Rated watt loss

The economy of a fuse dependsconsiderably on the rated watt loss.This should be kept as low aspossible by minimal self-heating.Siemens fuses, considering theirhigh breaking capacity, have ratedpower losses kept as low aspossible.

These values lie far below the limitsspecified in the standards. Thatmeans minimal heating, reliablebreaking capacity and higheconomy.

Load carrying capacity at higherambient temperatures

Testing according to IEC 60269

According to IEC 60269, the shapeof the time / current characteristicof LV HRC fuse links is referred toan ambient temperature of 20°C± 5%°C. When being used at ahigher ambient temperature (seediagram), a lower load carryingcapacity should be anticipated. Forexample, at an ambienttemperature of 50°C, a LV HRC fuselink should be loaded with only90% of the rated current. Theshort-circuit behaviour is notaffected by a high ambienttemperature.

4

Size Rating Order WeightNo. per unit

A kg

2 3NA7 802-0RC

0004 3NA7 804-0RC

0.1256 3NA7 801-0RC

10 3NA7 803-0RC

16 3NA7 805-0RC

00020 3NA7 807-0RC

0.12525 3NA7 810-0RC

32 3NA7 812-0RC

40 3NA7 817-0RC

000 50 3NA7 820-0RC 0.125

63 3NA7 822-0RC

00080 3NA7 824-0RC

0.125100 3NA7 830-0RC

00125 3NA7 832-0RC

0.190160 3NA7 836-0RC

50 3NA7 120-0RC

63 3NA7 122-0RC

180 3NA7 124-0RC

0.270100 3NA7 130-0RC

125 3NA7 132-0RC

160 3NA7 136-0RC

200 3NA7 140-0RC

1 224 3NA7 142-0RC 0.450

250 3NA7 144-0RC

2200 3NA7 240-0RC

0.475250 3NA7 244-0RC

2 315 3NA7 252-0RC0.670

*400 3NA7 260-0RC

315 3NA3 352-0RC

400 3NA3 360-0RC

3 500 3NA3 365-0RC 1.040

630 3NA3 372-0RC

*800 3NA3 375-4RC

* 400A (Size II) and 800A, are rated at 415V AC

Selection & Ordering DataLV HRC fuses : 500V AC

LV HRC fuse links

• According to IEC 60269/IS 13703

• Rated voltage (AC): 500V *

• Rated voltage (DC): 440V, upto 630A (250V for size 000/00)

• Utilization Category gG

• Rated breaking capacity: 120kA (AC), 25kA (DC)

5

Size Rating Order WeightNo. per unit

A kg

2 3NA7 802-6 0.122

4 3NA7 804-6 0.130

6 3NA7 801-6 0.122

10 3NA7 803-6 0.124

000 16 3NA7 805-6 0.123

20 3NA7 807-6 0.128

25 3NA7 810-6 0.120

32 3NA7 812-6 0.128

35 3NA7 814-6 0.129

40 3NA7 817-6RC

50 3NA7 820-6RC

00 63 3NA7 822-6RC 0.190

80 3NA7 824-6RC

100 3NA7 830-6RC

125 3NA7 132-6RC 0.270

1 160 3NA7 136-6RC 0.270

200 3NA7 140-6RC 0.450

2250 3NA7 244-6RC

315 3NA7 252-6RC0.670

400 3NA3 360-6RC

3 425 3NA3 362-6RC 1.040

500 3NA3 365-6RC

Selection & Ordering DataLV HRC fuses : 690V AC

LV HRC fuse links

• According to IEC 60269/IS 13703

• Rated voltage (AC): 690V

• Rated voltage (DC): 440V, (250V for size 00)

• Utilization Category gG

• Rated short circuit breaking capacity: 120kA (AC), 25kA (DC)

6

Conductor Order Weight- cross section No. per unit

upto mm2 kg

• Size 00Rated current 160A(Suitable for fuselink ofsize 000/00)Single pole

With screw in connection 95 3NH3 030 0.145

With plug-in connection 6 to 70 3NH3 032 0.145

• Size 1Rated current 250A

Single poleWith screw in connection 150 3NH3 230 0.390


Single poleWith screw in connection 300 3NH3 330 0.420


Single poleWith screw in connection 2x40x5 3NH3 430 0.680

• Size 3Rated current 800ASingle poleWith screw in connection 2x40x5 3NH3 430-4RC 0.720

Selection & Ordering DataLow-Voltage FusesSelection & Ordering Data

LV HRC Fuse Bases

Fuse bases are available in four different ratings corresponding to different sizes of fuse links. They consist of aninsulated base on which lyra contacts are fixed. Fuse links can be removed under live conditions. The fuse basescan be supplied either with screw terminals or plug in terminal connection.

The fuse bases are manufactured in accordance with IEC 269 & IS 13703

Rated voltage : AC 690V/DC 440V

Special Characteristics :

• Low contact resistance due to silver plated lyra contacts

• Easy handling due to special shape of lyra contacts

• Constant contact pressure ensures reliable current conduction

7

Selection & Ordering DataLow-Voltage Fuses

Isolating Links

Rating Order No. Weight(Nos.) per unit (Kg)

160 3NG1 000 0.075

250 3NG1 250 0.175

400 3NG1 300 0.260

630 3NG1 400 0.280

Fuse Pullers

Fuse puller with special insulated handle makes it possible to change fuses even under live conditions (on load).A mechanical lock provided on the fuse puller prevents the fuse link from drapping out the puller. The fuse linkcan be released by merely pressing the push button provided on a fuse puller.

3NX1 010

Fuse Puller Order No. WeightUnit per unit (Kg)

3NX1 010 0.205

3NX1 011 0.560

3NX1 014 0.480

Fuse PullerType 3NX1 010, 3NX1 011, 3NX1 014suitable for all sizes of fuse linksand isolating links.

Selection & Ordering Data

3NX1 011

3NX1 Signal Detector Link

3NX1 signal detector links are used for the remote indication of the fuse status (whether fuse has blown or not).These links are to be used with fuses having non-insulated grip lugs.

MLFB Description Fuse Size Weightper unit (Kg)

3NX1021 • Rated voltage upto 690V AC/600V DC• Contact: Microswitch 250V AC, 6A 000-4 0.036

3NX1022* • Response voltage > 9V AC, 2.5A 0.0153NA1023* • Response voltage >2V; 7A 000-4 0.015

3NX1024 • Rated voltage upto 690V AC/600V DC• Contact: Microswitch 230V AC, 6A 000-2 0.010

Together with fuse bases, these isolating links can effectively be used to serve as removable links in feedersinstead of isolators. These are made of silver plated copper alloy in one piece and are similar in construction tothe ribbed contact knife of the fuse link.

* To be used with 3NX1021

3NX1 014

NEW

8

Range3NA7 8

Size000/00

Operating classgG

Rated voltageAC 500V / DC 250V

Rated current2 - 160A

Characteristic Curves

Pre-

arci

ng

tim

e (s

ec)

Effective short circuit current (A)


Max

imu

m L

et T

hro

ugh

Cu

rren

t (A

)

Peak short circuitcurrent withmaximum DCcomponent

Peak short circuitcurrent without DCcomponent

Time-current characteristic chart

Peak let-through current chart


LV HRC Fuse Links

9

Range3NA7 1

Size1

Operating classgG

Rated voltageAC 500V / DC 440V







Pre-

arci

ng

tim

e (s

ec)


Max

imu

m L

et T

hro

ugh

Cu

rren

t (A

)



LV HRC Fuse Links

10

Range3NA7 2

Size2

Operating classgG

Rated voltageAC 500V* / DC 440V



Pre-

arci

ng

tim

e (s

ec)



Max

imu

m L

et T

hro

ugh

Cu

rren

t (A

)



LV HRC Fuse Links




* 400A rated at 415V AC

11

Range3NA3 3

Size3

Operating classgG

Rated voltageAC 500V* / DC440V



Pre-

arci

ng

tim

e (s

ec)



Max

imu

m L

et T

hro

ugh

Cu

rren

t (A

)






LV HRC Fuse Links

* 800A rated at 415V AC

12


Series : 3NA7 8..-6Size : 00Operational class : gGRated Voltage : 690V AC/250V DCRated current : 40... 100A

Time / current characteristics curves diagram

Current limitation diagram

Peak short circuit current with maximum DC component

Peak short circuit current without DC component

13







14







15







16

DimensionsDimensions

Sizes Rating MLFB b h1 h2 t1 t2

000 2A - 100A 3NA78... 21 54 80 45 8

00 125A - 160A 3NA78... 30 54 80 45 14

1 50A - 160A 3NA71... 30 75 137 50 15

1 200A - 250A 3NA71... 47 75 137 51 9

2 200A - 250A 3NA72... 47 75 151 58 10

2 315A - 400A 3NA72... 58 74 151 59 13

3 315A - 800A 3NA33... 71.2 74 151 69.5 12.8

3NH3 Fuse Bases

3NH3 030 (Size 00) 3NH3 032 (Size 00)

3NH3 230 (Size 1) 3NH3 330 (Size 2)

t1

t2

h 1 h 2b

in219061

Sticky Note

1 Opt - 712 / 13

in219061

Sticky Note

2 Opt - 724

17

3NG1 000 3NG1 250/300/400

Dimensions

Type a b c d e f

3NG1 250 135 23 40 56 35 8

3NG1 300 150 30 48 66.5 42.5 9

3NG1 400 150 36 60 77.5 42.5 10

3NH3 430 (Size 3)

Isolating Links 3NG

3NH3 Fuse Bases (Continuation)

Dimensions

3NG

18

Dimensions

3NX1 011

3NX Insulated-handle fuse pullers

3NX1 010

Dimensions

19

Notes

Siemens Ltd.Industry SectorBuilding Technologies DivisionLow Voltage Global ComponentsR&D Technology CentreKalwa Works, Thane Belapur Road, Thane - 400 601Fax: +91 22 33265627Email: [email protected]

Sales offices:

Order No.: 103794117GC-01-005-005(This replaces ET-01-014-004)

Product upgradation is a continuous process. Hence, data inthis catalog is subject to change without prior notice. For thelatest information, please get in touch with our Sales Offices.

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lv hrc fuses: din type · hrc fuse is the fuse element of high-grade copper. the important factors...

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