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. 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 - - - - -
RS Stock No. 312-3724
Mfr. Part No.GB2CB20
£17.81
Each
Units
12A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1.5 kA - - - - -
RS Stock No. 405-9264
Mfr. Part No.4130-G211-K4M1-70A
BrandETA
£26.50
Each
Units
70A 1 - - 18mm 4130 - - - - - - - -
RS Stock No. 458-8633
Mfr. Part No.3120-F72N-P7T1-A20Q-16A
BrandETA
£20.26
Each
Units
16A 2 - - 25mm 3120-F7 - - - - - - - -
RS Stock No. 312-3831
Mfr. Part No.GB2DB12
£41.00
Each
Units
6A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 1.5 (ac) kA - - - - -
RS Stock No. 782-0867
Mfr. Part No.W57-XB7A4A10-10
£2.35
Each
Units
10A 1 - 250V ac 0.575in W57 - - - - - - - -
RS Stock No. 729-2815
Mfr. Part No.3130-F130-P7T1-W02Q-16A
BrandETA
£26.62
Each
Units
16A 3 - - 41mm 3130 - - - - - - - -
RS Stock No. 173-9830
Mfr. Part No.4400.0034
BrandSchurter
£4.433
Each (In a Box of 100)
Units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 284-6016
Mfr. Part No.4400.0034
BrandSchurter
£7.65
Each
Units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 173-9828
Mfr. Part No.4400.0015
BrandSchurter
£4.433
Each (In a Box of 100)
Units
8A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 284-5861
Mfr. Part No.4400.0015
BrandSchurter
£7.65
Each
Units
8A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 312-3825
Mfr. Part No.GB2DB10
£41.00
Each
Units
5A 2 - 277 V ac, 415 V ac 30mm GB2 - - 1 (dc) kA, 2 (ac) kA - - - - -
RS Stock No. 170-9405
Mfr. Part No.W28-XQ1A-10
£2.215
Each (In a Bag of 100)
Units
10A 1 - 32 V dc, 250 V ac - W28 - - 1000 A - - - - -
RS Stock No. 405-9236
Mfr. Part No.4130-G211-K4M1-40A
BrandETA
£26.50
Each
Units
40A 1 - - 18mm 4130 - - - - - - - -
RS Stock No. 405-9208
Mfr. Part No.4130-G211-K4M1-30A
BrandETA
£26.50
Each
Units
30A 1 - - 18mm 4130 - - - - - - - -
RS Stock No. 167-5677
Mfr. Part No.W28-XQ1A-10
£2.60
Each
Units
10A 1 - 32 V dc, 250 V ac - W28 - - 1000 A - - - - -
RS Stock No. 284-5906
Mfr. Part No.4400.0017
BrandSchurter
£6.06
Each
Units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 173-9833
Mfr. Part No.4400.0017
BrandSchurter
£4.433
Each (In a Box of 100)
Units
16A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 333-237
Mfr. Part No.201-1A
BrandETA
£34.08
Each
Units
1A 1 - - 80mm 201 - - - - - - - -