NEW

Moulded CaseCircuit Breakers

New DU Series 20 A to 250 A

Switchgear Factory, Mumbai

About us

Larsen & Toubro is a technology-driven company that infuses engineering with imagination. The Company offers a wide range of advanced solutions in the field of Engineering, Construction, Electrical & Electronics, Machinery and Information Technology.

L&T Switchgear, which forms part of the Electrical & Automation business, is India's largest manufacturer of low voltage switchgear, with the scale, sophistication and range to meet global benchmarks. With over five decades of experience in this field, the Company today enjoys a leadership position in the Indian market with growing presence in international markets.

It offers a complete range of products including controlgear, powergear, motor starters, energy meters, wires and host of other accessories. Most of our product lines conform to international standards, carry marking and are certified.

The products conform to international standards, carry marking and are & CB certified.

The DU Series, a new generation of MCCBs, stands out due to its state-of-the-art design, contemporary user-friendly features, wide choice of protective releases, ergonomics, aesthetics and compactness.

The DU Series complies with the latest standards like IEC 60947-2, EN 60947-2 & IS 13947-2.

The range is specially designed for tropical conditions, ensuring reliable performance at high ambient and humid environments. The range can satisfy the most demanding system requirements.

The DU Series, has a wide range of accessories, ensuring operational safety, reliability and versatility.

1

L&T now extends the DU range of MCCBs with DU100H & DU250.

Salient Features of New DU Series

* For 3P & 4P MCCBs.** Only for DU100H

# To be fitted in the right cavity$ To be fitted in the left cavity

Internal Accessories*

Æ

Æ

Æ

Æ

Æ

Æ

Knob designed for better gripColor indication of ON/TRIP/OFFCurrent rating on the knobOverload adjustment from front* Easy ON/OFF/RESET operations Wide variety of snap fit accessories*

Ergonomic Design & User Friendliness

Æ

Æ

45mm door cutoutBuilt in DIN rail mounting**

Easy to Install

Æ

Æ

Æ

Æ

Æ

Direct mounted & extended ROMSpreader linksPadlock is available (Only with ROM) Box clampsTerminal shroud**

External Accessories*

Æ

Æ

Æ

Æ

Æ

Positive isolation with positive OFF indicationFinger proof terminalsLockable shroud on thermal knob to prevent unauthorized operation* Marked rangeDouble Insulation: The internal accessories are housed in insulated casings to ensure first level of insulation. When the front cover is opened for the fixing of internal accessories, the MCCB is totally insulated ensuring the double insulation

Safe to Use

Æ

Æ

Æ

Æ

Æ

Auxiliary contactsTrip alarm contactsCombined Auxiliary + Trip alarm contacts #Shunt release $ Under Voltage release $

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Æ

Æ

Compact sizeSuitable for side by side mountingSuitable for use in MCB Distribution Board

Compact

Æ

Æ

Specially designed arc suction effect & speedo quench contact systemNo load line bias: Either side of MCCB terminal can be used as load or line

Technology

DU Series

Technical Data

Technical Parameter

Type Designation

No. of Poles

Rated Current

Rated Operational Voltage

Rated Insulation Voltage

Operational Frequency

Reference Temperature

Rated Ultimate S. C. Breaking

Capacity (Icu)

Rated Service S. C. Breaking

Capacity (Ics)

Mechanical Life

Electrical Life

Reference Standard

Type of Release

Thermal

Magnetic

Terminal Capacity

Cables with Lug

With box clamp

Link

Overall Dimensions

Width

Height

Mounting Depth

Weight

Specification

DU100H 1P

1

20 A to 100 A

240 V

25kA

8kA

5kA

-

-

Fixed

Fixed (10 x In)

25mm

130mm

60mm

0.28kg

In

Ue

Ui

240 V

400 V

415 V

500 V

600 V

3

100 A to 250 A

Variable (0.8 - 1.0 x In)

Fixed (9 x In)

2120mm

2120mm

25mm

105mm

165mm

60mm

1.45kg

DU250 3P

65kA

36kA

36kA

10kA

5kA

10000

3000

DU100H 2P/3P/4P

2/3/4

20 A to 100 A

690 V

@ 50 or 60 Hz

40°C

50% of lcu

IEC 60947 - 2, EN 60947 - 2, IS 13947 - 2 (part 2)

Thermal - Magnetic

Variable (0.8 - 1.0 x In)

Fixed (9 x In)

235mm

235mm

16mm

75/75/100 mm

130mm

60mm

0.60/0.73/0.96 kg

415 V

65kA

36kA

30kA

10kA

5kA

30000

6000

No. of operations

No. of operations

2

Ordering Information

Internal Accessories

3-Pole & 4-Pole versions

Catalogue No.

CM97886OOOO

CM97887OOOO

CM97888OOOO

CM97889OOOO

CM97890OOOO

CM97883OMOO

CM97892BOOO

Description

Auxiliary Contact 1C/O

Auxiliary Contact 2C/O

Trip Alarm Contact (TAC) 1C/O

Trip Alarm Contact 2C/O

Auxiliary 1C/O + (TAC) 1C/O

Shunt Release 415/240 V AC

Under Voltage Release, 240 V AC

3-Pole Version

External Accessories

DU100H 3P DU100H 4PDescription

Spreader Links

ROM - Extended

ROM - Direct

CM97921OOOO CM97896OOOO

CM97895OOOO

CM97785OOOO

CM97896OOOO

CM97895OOOO

DU250 3P ST98053OOOO CM98041OOOO

CM98040OOOO

Catalogue No.

DU250 3P

CM98064OOOO

CM98063OOOO

CM98062OOOO

CM98061OOOO

CM98060OOOO

Rating

100 A

125 A

160 A

200 A

250 A

DU100H

10000

1000

100

10

1

0.1

0.01

2 4 6 81 10 20

Multiples of Current Multiples of Current

Tim

e in

Se

con

ds

Catalogue No.

DU100H 1P

CM97922OOC2

CM97922OOD2

CM97922OOE2

CM97922OOF2

CM97922OOG2

CM97922OOH2

CM97922OOJ2

CM97922OOK2

DU100H 2P

CM97898OOC2

CM97898OOD2

CM97898OOE2

CM97898OOF2

CM97898OOG2

CM97898OOH2

CM97898OOJ2

CM97898OOK2

Rating

20 A

25 A

32 A

40 A

50 A

63 A

80 A

100 A

DU100H 3P

CM97894OOC2

CM97894OOD2

CM97894OOE2

CM97894OOF2

CM97894OOG2

CM97894OOH2

CM97894OOJ2

CM97894OOK2

DU100H 4P

CM97933OOC2

CM97933OOD2

CM97933OOE2

CM97933OOF2

CM97933OOG2

CM97933OOH2

CM97933OOJ2

CM97933OOK2

DU250 MCCB

I-T Characteristics Curves

Tim

e in

Se

con

ds

10000

1000

100

10

1

0.1

0.011 10 100

3

4All dimensions are in mm

106

58

.64

6.1

35.5

25

1

27

41

.6

85

.6

46

.8

3.8

Cut-out

Door Cut-out Dimensions

Mount MCCB with two Screwsat Diagonal Position M3-Ø2.4 (2 nos.)

Door Cut-out Dimensions

25.5 25M3-Ø2.4

2.25

48

.5

52

29.5

76

112

46

39

Cut-out 1

or

Cut-out 2

DU250 3P

Panel Cut-out Dimension

DU100H 3PDU100H 1P DU250 3P

Spreader links are available as spare.It is recommended to use spreader links for enhancing termination capacity.

Overall Dimensions

DU100H

3-Pole, 4-Pole1-Pole 3-Pole with spreaders 4-Pole with spreaders 1-Pole, 3-Pole, 4-Pole

For 2-Pole MCCB, refer 3-Pole dimensionsSpreader links are available as spare.It is recommended to use spreader links for enhancing termination capacity.

13

0

116

.2

12

.87

12.525

Cu

t-o

ut

T

O OFF

ONI

100 (4 pole)

12.5

25

75 (3 pole)

25 25

116

.4

13

0

N

s

6.9 9

86.1

65

61

4.5

20

Terminal

2 32

.1

116

.4

13

0

N

s

127

35 35 35

35 35 35

127

92

35 35

19

4.2

17

2.2

30

.211

22

35 35

16

5

14

5

12

6

35

105

60

18

64.5

35 35

18

38

25

7

22

1

54.5

72

54.5

72

18

4

4

18

93.7

42.5

3.8

Cut-out 1

Cut-out 2

5All dimensions are in mm

L1 = Mounting depth

L2/L3 = Panel cut-out

L4/L5 = Breaker mounting reference

L2

L4

L3

L1

L5

Panel

Panel cutout

Breaker mounting holes

Handle Assembly Mounting Dimensions - ROMExtended

Panel Cut Details

As Viewed from the front

Ø51

Ø76

Ø4

45°

L2

L3

MCCB Mounting Holes

Reference as perMCCB Mounting

s

L1

275

L

Cut the shaft to the required length = L

L = Length of Shaft required for Panel Depth L1 (mm)L1 = Min. Panel depth (mm)

Extended ROM

ROM Mounting Dimension

L1

96.5

96.5

Type

DU100H

DU250

L2

58

75

L3

52

52

L4

44

56.5

L5

37

55

L1

169

169

Type

DU100H

DU250

L

L1-119

L1-119

L2

7.5

24.5

L3

69.5

81.7

Mounting Dimensions - Direct ROM

SP 50520

REGISTERED OFFICE AND HEAD OFFICEL&T House, Ballard EstateP. O. Box 278Mumbai 400 001Tel: 022-67525656Fax: 022-67525858Website: www.Larsentoubro.com

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170211

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