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. 323-9015
Mfr. Part No.GB2CD08
£30.63
Each
Units
3A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 3 (ac) kA - - - - -
RS Stock No. 272-836
Mfr. Part No.GV3L40
£155.00
Each
Units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 312-3645
Mfr. Part No.GB2CB07
£17.55
Each
Units
2A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 15 (ac) kA - - - - -
RS Stock No. 312-3639
Mfr. Part No.GB2CB06
£17.55
Each
Units
1A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS Stock No. 272-858
Mfr. Part No.GV3L65
£175.00
Each
Units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 406-9491
Mfr. Part No.2-5700-IG1-P10-DD-000040-25A
BrandETA
£12.66
Each
Units
25A 1 - - 29mm 2-5700 - - - - - - - -
RS Stock No. 273-0882
Mfr. Part No.1658-G21-02-P10-15A
BrandETA
£6.83
Each
Units
15A 1 - - 32mm 1658 - - - - - - - -
RS Stock No. 405-9179
Mfr. Part No.2-5700-IG1-P10-DD-000040-20A
BrandETA
£12.71
Each
Units
20A 1 - - 29mm 2-5700 - - - - - - - -
RS Stock No. 323-9043
Mfr. Part No.GB2CD12
£30.63
Each
Units
6A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 1.5 (ac) kA - - - - -
RS Stock No. 729-2849
Mfr. Part No.3600-P10-Si-4A
BrandETA
£53.91
Each
Units
4A 1 - - 11.5mm 3600 - - - - - - - -
RS Stock No. 272-909
Mfr. Part No.GV3P25
£126.00
Each
Units
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
RS Stock No. 312-3780
Mfr. Part No.GB2DB07
£40.00
Each
Units
2A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 15 (ac) kA - - - - -
RS Stock No. 323-9021
Mfr. Part No.GB2CD09
£30.63
Each
Units
4A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 3 (ac) kA - - - - -
RS Stock No. 416-994
Mfr. Part No.1110-F112-P1M1-5A
BrandETA
£14.48
Each
Units
5A 1 - - 19mm 1110 - - - - - - - -
RS Stock No. 312-3667
Mfr. Part No.GB2CB09
£17.55
Each
Units
4A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 6 (ac) kA - - - - -
RS Stock No. 333-265
Mfr. Part No.201-5A
BrandETA
£36.44
Each
Units
5A 1 - - 80mm 201 - - - - - - - -
RS Stock No. 323-8999
Mfr. Part No.GB2CD06
£30.63
Each
Units
1A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS Stock No. 333-243
Mfr. Part No.201-2A
BrandETA
£36.44
Each
Units
2A 1 - - 80mm 201 - - - - - - - -
RS Stock No. 286-4137
Mfr. Part No.3120-F521-H7T1-W01D-10A
BrandETA
£26.11
Each
Units
10A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 610-0910
Mfr. Part No.GB2CD16
£30.63
Each
Units
10A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 1.5 (ac) kA - - - - -
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