Thermal Magnetic Circuit Breakers

Thermal magnetic circuit breakers are devices that provide protection against overcurrent in circuits. Circuit breakers use an automatically operated electrical switch to disrupt the flow of current when an overload or short circuit is detected. Thermal magnetic circuit breakers do this using an electromagnet and bimetallic strips. 


Circuit breakers provide more sophisticated protection against overcurrent than a simple fuse. Fuses simply burn out and have to be replaced, whereas circuit breakers just need to be reset.


How do thermal magnetic circuit breakers work?

In thermal magnetic circuit breakers, there are two ways the flow of current might be detected and disrupted. In the event of a short circuit, the electromagnet rapidly trips the switch. If the overload is smaller, over a longer period of time, the bimetallic strips will instead eventually react to trip the switch. 


What are thermal magnetic circuit breakers used for?

Thermal magnetic circuit breakers are most often used in distribution boards. They make up part of the subsidiary circuits in the broader electrical supply system, protecting against overcurrent.


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Description Price Current Rating Number of Poles Range Voltage Rating Width Series Application Break Time Breaking Capacity at Maximum Voltage Rating Circuit Breaker Type Mounting Hole Diameter Mounting Hole Length Mounting Hole Size Mounting Hole Width
RS Stock No. 170-3790
Mfr. Part No.0712314
TWD547.60
Each (In a Box of 20)
units
10A 1 - 65 V dc, 250 V ac 8.2mm TCP 10A - - - - - - - -
RS Stock No. 801-6915
Mfr. Part No.0712314
TWD597.00
Each
units
10A 1 - 65 V dc, 250 V ac 8.2mm TCP 10A - - - - - - - -
RS Stock No. 170-3787
Mfr. Part No.0712259
TWD544.70
Each (In a Box of 20)
units
4A 1 - 65 V dc, 250 V ac 8.2mm TCP 4A - - - - - - - -
RS Stock No. 801-6909
Mfr. Part No.0712259
TWD597.00
Each
units
4A 1 - 65 V dc, 250 V ac 8.2mm TCP 4A - - - - - - - -
RS Stock No. 881-8272
Mfr. Part No.1689569
TWD47,500.00
1 Box of 10000
Box(es)
- - - - - VS-BU-CD-1.0/14.4/0.5-R - - - - - - - -
RS Stock No. 768-1025
Mfr. Part No.2800889
TWD2,477.00
Each
units
16A 2 TRABTECH - 24.6mm CB TM2 16A M1 P - - - - - - - -
RS Stock No. 170-3786
Mfr. Part No.0712217
TWD544.70
Each (In a Box of 20)
units
2A 1 - 65 V dc, 250 V ac 8.2mm TCP 2A - - - - - - - -
RS Stock No. 170-3791
Mfr. Part No.0712275
TWD544.40
Each (In a Box of 20)
units
6A 1 - 65 V dc, 250 V ac 8.2mm TCP 6A - - - - - - - -
RS Stock No. 801-7043
Mfr. Part No.0914510
TWD3,226.00
Each
units
8A 1 - 65 V dc, 250 V ac 12.5mm TMC M1 - - - - - - - -
RS Stock No. 768-1022
Mfr. Part No.2800888
TWD4,330.00
Each
units
12A 2 TRABTECH - 24.6mm CB TM2 12A M1 P - - - - - - - -
RS Stock No. 801-6918
Mfr. Part No.0712275
TWD622.00
Each
units
6A 1 - 65 V dc, 250 V ac 8.2mm TCP 6A - - - - - - - -
RS Stock No. 881-8231
Mfr. Part No.1688900
TWD531.00
Each (In a Box of 10)
units
- - - - - VS-15-BU-DSUB-FK - - - - - - - -
RS Stock No. 855-7355
Mfr. Part No.0912019
TWD26,220.00
1 Box of 5
Box(es)
- - - - - - - - - - - - - -
RS Stock No. 801-6905
Mfr. Part No.0712233
TWD662.00
Each
units
3A 1 - 65 V dc, 250 V ac 8.2mm TCP 3A - - - - - - - -
RS Stock No. 881-8199
Mfr. Part No.1688421
TWD193.90
Each (In a Box of 10)
units
- - - - - VS-09-BU-DSUB-2P - - - - - - - -
RS Stock No. 881-8262
Mfr. Part No.1689336
TWD127.50
Each (In a Box of 10)
units
- - - - - VS-PSC 1.5/3-M PE - - - - - - - -
RS Stock No. 801-6898
Mfr. Part No.0712152
TWD597.00
Each
units
500mA 1 - 65 V dc, 250 V ac 8.2mm TCP 0.5A - - - - - - - -
RS Stock No. 881-8193
Mfr. Part No.1688476
TWD272.00
1 Box of 5
Box(es)
- - - - - VS-09-TI-2EMV - - - - - - - -
RS Stock No. 881-8244
Mfr. Part No.1689006
TWD323.00
Each (In a Box of 10)
units
- - - - - VS-09-ST-DSUB-1P-4S - - - - - - - -
RS Stock No. 882-2300
Mfr. Part No.0915797
TWD18,558.00
1 Box of 6
Box(es)
4A 2 - 65 V dc, 250 V ac 12.5mm TMCP 1 M1 300 4A - - - - - - - -