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. 335-968
Mfr. Part No.106-P30-000040-5A
BrandETA
£7.43
Each
Units
5A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 282-6545
Mfr. Part No.2210-T210-K0M1-H121-5A
BrandETA
£35.63
Each
Units
5A 1 - - 12.5mm 2210 - - - - - - - -
RS Stock No. 405-9113
Mfr. Part No.2-5700-IG1-P10-DD-000040-1A
BrandETA
£15.19
Each
Units
1A 1 - - 15.7mm 2-5700 - - - - - - - -
RS Stock No. 335-996
Mfr. Part No.106-P30-000040-2A
BrandETA
£7.63
Each
Units
2A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 312-3689
Mfr. Part No.GB2CB12
£17.81
Each
Units
6A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 1.5 (ac) kA - - - - -
RS Stock No. 344-5327
Mfr. Part No.1658-G21-02-P10-6A
BrandETA
£6.31
Each
Units
6A 1 - - 14mm 1658 - - - - - - - -
RS Stock No. 286-4020
Mfr. Part No.3120-F551-H7T1-W02D-20A
BrandETA
£20.14
Each
Units
20A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 286-4165
Mfr. Part No.3120-F521-H7T1-W01D-20A
BrandETA
£28.12
Each
Units
20A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 323-9037
Mfr. Part No.GB2CD10
£30.63
Each
Units
5A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 2 (ac) kA - - - - -
RS Stock No. 272-820
Mfr. Part No.GV3L32
£141.00
Each
Units
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -
RS Stock No. 312-3796
Mfr. Part No.GB2DB08
£41.00
Each
Units
3A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 10 (ac) kA - - - - -
RS Stock No. 272-842
Mfr. Part No.GV3L50
£167.00
Each
Units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 417-026
Mfr. Part No.1110-F112-P1M1-16A
BrandETA
£16.66
Each
Units
16A 1 - - 19mm 1110 - - - - - - - -
RS Stock No. 312-3774
Mfr. Part No.GB2DB06
£41.00
Each
Units
1A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 50 (ac) kA - - - - -
RS Stock No. 312-3651
Mfr. Part No.GB2CB08
£17.81
Each
Units
3A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 10 (ac) kA - - - - -
RS Stock No. 336-012
Mfr. Part No.106-P30-000040-1A
BrandETA
£7.41
Each
Units
1A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 782-0902
Mfr. Part No.W58-XB1A4A-15
£4.86
Each
Units
15A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 728-8632
Mfr. Part No.105-P10-10A
BrandETA
£8.60
Each
Units
10A 1 - - 14mm 105 - - - - - - - -
RS Stock No. 405-9129
Mfr. Part No.2-5700-IG1-P10-DD-000040-2.5A
BrandETA
£13.44
Each
Units
2.5A 1 - - 15.7mm 2-5700 - - - - - - - -
RS Stock No. 272-886
Mfr. Part No.GV3P13
£104.00
Each
Units
- 3 TeSys 690V ac 55mm GV3 - - 6 kA - - - - -