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. 881-8203
Mfr. Part No.1688638
R 74.60
1 Box of 5
Box(es)
- - - - - VS-08-T-RJ45/IP 20 - - - - - - - -
RS stock no. 170-3784
Mfr. Part No.0712123
R 244.626
Each (In a Box of 20)
units
250mA 1 - 65 V dc, 250 V ac 8.2mm TCP 0.25A - - - - - - - -
RS stock no. 801-6895
Mfr. Part No.0712123
R 241.86
Each
units
250mA 1 - 65 V dc, 250 V ac 8.2mm TCP 0.25A - - - - - - - -
RS stock no. 881-8272
Mfr. Part No.1689569
R 2,521.71
1 Box of 10000
Box(es)
- - - - - VS-BU-CD-1.0/14.4/0.5-R - - - - - - - -
RS stock no. 801-6905
Mfr. Part No.0712233
R 240.65
Each
units
3A 1 - 65 V dc, 250 V ac 8.2mm TCP 3A - - - - - - - -
RS stock no. 885-6258
Mfr. Part No.3000761
R 885.132
1 Box of 10
Box(es)
- - - - - - - - - - - - - -
RS stock no. 881-8231
Mfr. Part No.1688900
R 164.42
Each (In a Box of 10)
units
- - - - - VS-15-BU-DSUB-FK - - - - - - - -
RS stock no. 885-6261
Mfr. Part No.3000763
R 919.135
1 Box of 6
Box(es)
- - - - - - - - - - - - - -
RS stock no. 881-8146
Mfr. Part No.1687273
R 304.26
Each (In a Box of 10)
units
- - - - - HC-B 16-SD-FQT/FS - - - - - - - -
RS stock no. 801-6892
Mfr. Part No.0712194
R 210.46
Each
units
1A 1 - 65 V dc, 250 V ac 8.2mm TCP 1A - - - - - - - -
RS stock no. 881-8161
Mfr. Part No.1688201
R 48.58
Each (In a Box of 10)
units
- - - - - VS-15-ST-DSUB-3P - - - - - - - -
RS stock no. 885-6252
Mfr. Part No.3000762
R 88.95
1 Box of 10
Box(es)
- - - - - - - - - - - - - -
RS stock no. 881-8155
Mfr. Part No.1688081
R 182.03
Each (In a Box of 10)
units
- - - - - VS-15-ST-DSUB-ER - - - - - - - -
RS stock no. 170-3783
Mfr. Part No.0712194
R 244.311
Each (In a Box of 20)
units
1A 1 - 65 V dc, 250 V ac 8.2mm TCP1A - - - - - - - -
RS stock no. 768-0864
Mfr. Part No.2800841
R 571.53
Each
units
6A 1 TRABTECH - 12.3mm CB TM1 6A SFB P - - - - - - - -
RS stock no. 882-2328
Mfr. Part No.0915849
R 952.43
1 Box of 6
Box(es)
12A - - 65 V dc, 250 V ac - TMCP 1 M1 300 12.0A - - - - - - - -
RS stock no. 801-7040
Mfr. Part No.0914507
R 1,346.87
Each
units
6A 1 - 65 V dc, 250 V ac 12.5mm TMC M1 - - - - - - - -
RS stock no. 768-1022
Mfr. Part No.2800888
R 1,131.67
Each
units
12A 2 TRABTECH - 24.6mm CB TM2 12A M1 P - - - - - - - -
RS stock no. 768-0852
Mfr. Part No.2800839
R 571.53
Each
units
4A 1 TRABTECH - 12.3mm CB TM1 4A SFB P - - - - - - - -
RS stock no. 801-6909
Mfr. Part No.0712259
R 225.68
Each
units
4A 1 - 65 V dc, 250 V ac 8.2mm TCP 4A - - - - - - - -