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
$10.78
Each
units
13A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0099
BrandRS PRO
$6.68
Each
units
2.2A 2 - 250V ac 6mm AN - - - - - - - -
RS Stock No. 774-0039
BrandRS PRO
$14.01
Each
units
16A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0023
BrandRS PRO
$13.34
Each
units
9A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0067
BrandRS PRO
$9.23
Each
units
16A - - - 14.1mm A-0709 - - - - - - - -
RS Stock No. 774-0020
BrandRS PRO
$9.70
Each
units
8A - - - 11mm A-0709 - - - - - - - -
RS Stock No. 774-0051
BrandRS PRO
$11.65
Each
units
9A - - - 14.1mm A-0709 - - - - - - - -
RS Stock No. 774-0045
BrandRS PRO
$11.65
Each
units
6A - - 32 V dc, 240 V ac 14.1mm A-0709 - - - - - - - -
RS Stock No. 774-0042
BrandRS PRO
$9.32
Each
units
5A - - - 14.1mm A-0709 - - - - - - - -
RS Stock No. 405-9157
Mfr. Part No.2-5700-IG1-P10-DD-000040-15A
BrandETA
$32.63
Each
units
15A 1 - - 29mm 2-5700 - - - - - - - -
RS Stock No. 212-1913
Mfr. Part No.3130-F110-P7T1-W02Q-15A
BrandETA
$49.36
Each
units
15A 1 - - 36mm 3130 - - - - - - - -
RS Stock No. 405-9141
Mfr. Part No.2-5700-IG1-P10-DD-000040-10A
BrandETA
$32.63
Each
units
10A 1 - - 29mm 2-5700 - - - - - - - -
RS Stock No. 782-7931
Mfr. Part No.W57-XB7A4A10-15
$4.05
Each
units
15A 1 - 250V ac 0.575in W57 - - - - - - - -
RS Stock No. 782-7821
Mfr. Part No.W57-XB1A7A10-5
$4.76
Each
units
5A 1 - 250V ac 0.575in W57 - - - - - - - -
RS Stock No. 868-9030
Mfr. Part No.4430.0022
BrandSchurter
$33.86
Each
units
10A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - -
RS Stock No. 286-4143
Mfr. Part No.3120-F521-H7T1-W01D-12A
BrandETA
$49.90
Each
units
12A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 336-028
Mfr. Part No.106-P30-000040-0.5A
BrandETA
$27.09
Each
units
500mA 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 868-9106
Mfr. Part No.4430.0990
BrandSchurter
$61.60
Each
units
6A 2 - 60 V dc, 240 V ac - TA45 - - - - - - - -
RS Stock No. 405-9129
Mfr. Part No.2-5700-IG1-P10-DD-000040-2.5A
BrandETA
$32.76
Each
units
2.5A 1 - - 29mm 2-5700 - - - - - - - -
RS Stock No. 782-7922
Mfr. Part No.W57-XB1A7A10-15
$4.76
Each
units
15A 1 - 250V ac 0.575in W57 - - - - - - - -
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