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. 774-0099
BrandRS PRO
SGD5.68
Each
units
2.2A 2 - 250V ac 6mm AN - - - - - - - -
RS Stock No. 774-0045
BrandRS PRO
SGD12.72
Each
units
6A - - 32 V dc, 240 V ac 14.1mm A-0709 - - - - - - - -
RS Stock No. 774-0036
BrandRS PRO
SGD13.50
Each
units
13A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0020
BrandRS PRO
SGD13.56
Each
units
8A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0042
BrandRS PRO
SGD11.72
Each
units
5A - - - 14.1mm A-0709 - - - - - - - -
RS Stock No. 774-0039
BrandRS PRO
SGD13.50
Each
units
16A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 782-0918
Mfr. Part No.W58-XB1A4A-30
SGD12.42
Each
units
30A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 405-9157
Mfr. Part No.2-5700-IG1-P10-DD-000040-15A
BrandETA
SGD36.76
Each
units
15A 1 - - 15.7mm 2-5700 - - - - - - - -
RS Stock No. 458-8683
Mfr. Part No.1180-01-2A
BrandETA
SGD39.30
Each
units
2A 1 - - 8.2mm 1180 - - - - - - - -
RS Stock No. 782-7969
Mfr. Part No.W54-XB1A4A10-10
SGD7.56
Each
units
10A 1 - 250V ac 0.575in W54 - - - - - - - -
RS Stock No. 405-9135
Mfr. Part No.2-5700-IG1-P10-DD-000040-7A
BrandETA
SGD29.57
Each
units
7A 1 - - 15.7mm 2-5700 - - - - - - - -
RS Stock No. 458-8712
Mfr. Part No.1180-01-4A
BrandETA
SGD38.97
Each
units
4A 1 - - 8.2mm 1180 - - - - - - - -
RS Stock No. 272-921
Mfr. Part No.GV3P40
SGD336.90
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 272-937
Mfr. Part No.GV3P65
SGD621.14
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 312-3623
Mfr. Part No.GB2CB05
SGD39.03
Each
units
500mA 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS Stock No. 458-8728
Mfr. Part No.1180-01-6A
BrandETA
SGD28.53
Each
units
6A 1 - - 8.2mm 1180 - - - - - - - -
RS Stock No. 729-2764
Mfr. Part No.2-5700-IG2-P10-DD-000040-16A
BrandETA
SGD39.47
Each
units
16A 1 - - 15.7mm 2 5700 - - - - - - - -
RS Stock No. 323-9009
Mfr. Part No.GB2CD07
SGD88.06
Each
units
2A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 15 (ac) kA - - - - -
RS Stock No. 782-7956
Mfr. Part No.W28-XQ1A-0.50
SGD12.82
Each
units
500mA 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS Stock No. 272-943
Mfr. Part No.GV3P50
SGD593.71
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -