C4 Motor Circuit Breakers

Compact and high integrity protection of electric motors up to 100Amps, and 100kA, is provided by IMO’s C4 range of motor circuit breakers. Robust and reliable in operation, the circuit breakers provide optimal motor protection by integrating the functions of a moulded case circuit breaker and a thermal overload relay into a single, highly compact unit.

The C4 circuit breakers integrate the latest developments in technology for low voltage electromechanical devices. These developments are enabling IMO to provide components with a higher number of incorporated functions, allowing more compact configurations in electric motor installations.

Rated from 0.16A to 100A, in 4 frame sizes, the C4 range gives short circuit breaking capacity of up to 100kA Icu without the need for back up fuses. In addition, incorporated features such as thermal overloads and phase failure protection ensure comprehensive protection of the electric circuit and the connected motor.

Conveniently for users, the flexible design of the C4 circuit breaker allow Aux contacts to be fitted either within the foot print of the circuit breaker, or on the sides of the unit. In addition, a raft of approvals including IEC 60947-1, 60947-2, 60947-4-1 and VDE 0660, and UL, ensure that the C4 circuit breakers are ideal for OEM applications.

The DIN rail- mounted C4 breakers are easy to use and install; a large range of accessories, including interconnecting units, supports them. These give the ability to configure combination starters for compact, reliable motor protection by combining a manual motor starter and a magnetic contactor.

Features include:


• Motor protection rating up to 100 Amps • Short circuit breaking capacity up to 100kA • Phase failure protection • DIN rail mounting • Wide range of accessories

C4/32T

Setting Range  

Short Circuit
Release

Part Ref

Ultimate Short Circuit breaking/
Service Capacity < 400V AC
Max Fuse A

A

A

Ics - kA      Ics - kA      gL/gG

0.10 - 0.16

2.1

C4/32T-0.16

100             100             --

0.16 - 0.25

3.3

C4/32T-0.25

100             100             --

0.25 - 0.4

5.2

C4/32T-0.4

100             100             --

0.4 - 0.63

8.2

C4/32T-0.63

100             100             --

0.63 - 1

13

C4/32T-1

100             100             --

1 - 1.6

20.8

C4/32T-1.6

100             100             --

1.6 - 2.5

32.5

C4/32T-2.5

100             100             --

2.5 - 4

52

C4/32T-4

100             100             --

4 - 6

78

C4/32T-6

100             100             --

5 - 8

104

C4/32T-8

100             100             --

6 - 10

130

C4/32T-10

    50               38             80"

9 - 13

169

C4/32T-13

    50               38             80"

11 - 17

221

C4/32T-17

    20               15           100"

14 - 22

286

C4/32T-22

    15               11           100"

18 - 26

338

C4/32T-26

    15               11           100"

22 - 32

416

C4/32T-32

    15               11           100"

C4/63R

Setting Range  

Short Circuit
Release

Part Ref

Ultimate Short Circuit breaking/
Service Capacity < 400V AC
Max Fuse A

A

A

Ics - kA      Ics - kA      gL/gG

18 - 26

338

C4/63R-26

    50               50            125"

22 - 32

416

C4/63R-32

    50               50            125"

28 - 40

520

C4/63R-40

    50               50            160"

34 - 50

650

C4/63R-50

    50               50            160"

45- 63

819

C4/63R-63

    50               50            160"

-- No back-up fuse required * Back up fuse required if short circuit current at installation point > 50k Full range of MCB's