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. 774-0036
BrandRS PRO
£6.29
Each
Units
13A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0039
BrandRS PRO
£6.29
Each
Units
16A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0020
BrandRS PRO
£6.32
Each
Units
8A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0042
BrandRS PRO
£5.45
Each
Units
5A - - - 14.1mm A-0709 - - - - - - - -
RS Stock No. 774-0099
BrandRS PRO
£2.64
Each
Units
2.2A 2 - 250V ac 6mm AN - - - - - - - -
RS Stock No. 774-0045
BrandRS PRO
£1.27
Each
Units
6A - - 32 V dc, 240 V ac 14.1mm A-0709 - - - - - - - -
RS Stock No. 272-943
Mfr. Part No.GV3P50
£170.00
Each
Units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 405-9141
Mfr. Part No.2-5700-IG1-P10-DD-000040-10A
BrandETA
£16.01
Each
Units
10A 1 - - 15.7mm 2-5700 - - - - - - - -
RS Stock No. 272-921
Mfr. Part No.GV3P40
£155.00
Each
Units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 272-937
Mfr. Part No.GV3P65
£180.00
Each
Units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 323-9009
Mfr. Part No.GB2CD07
£31.00
Each
Units
2A 1P + N - 250V ac 15mm GB2 - - 1 (dc) kA, 15 (ac) kA - - - - -
RS Stock No. 729-2770
Mfr. Part No.3120-F554-P7T1-W02D-5A
BrandETA
£21.87
Each
Units
5A 2 - - 25mm 3120-F - - - - - - - -
RS Stock No. 729-2758
Mfr. Part No.2-5700-IG2-P10-DD-000040-10A
BrandETA
£18.01
Each
Units
10A 1 - - 15.7mm 2 5700 - - - - - - - -
RS Stock No. 286-4159
Mfr. Part No.3120-F521-H7T1-W01D-16A
BrandETA
£31.33
Each
Units
16A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 405-9157
Mfr. Part No.2-5700-IG1-P10-DD-000040-15A
BrandETA
£16.01
Each
Units
15A 1 - - 15.7mm 2-5700 - - - - - - - -
RS Stock No. 273-0860
Mfr. Part No.1658-G21-02-P10-10A
BrandETA
£5.46
Each
Units
10A 1 - - 14mm 1658 - - - - - - - -
RS Stock No. 344-5333
Mfr. Part No.1658-G21-02-P10-16A
BrandETA
£6.31
Each
Units
16A 1 - - 14mm 1658 - - - - - - - -
RS Stock No. 405-9135
Mfr. Part No.2-5700-IG1-P10-DD-000040-7A
BrandETA
£15.25
Each
Units
7A 1 - - 15.7mm 2-5700 - - - - - - - -
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
£157.00
Each
Units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
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