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. 782-0918
Mfr. Part No.W58-XB1A4A-30
$8.18
Each
units
30A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 729-2782
Mfr. Part No.3120-F554-P7T1-W02D-16A
BrandETA
$48.39
Each
units
16A 2 - - - 3120-F - - - - - - - -
RS Stock No. 782-8098
Mfr. Part No.W31-X2M1G-50
$50.13
Each
units
50A 1 - 50 V dc, 240 V ac 0.69in W31 - - - - - - - -
RS Stock No. 782-0867
Mfr. Part No.W57-XB7A4A10-10
$2.52
Each
units
10A 1 - 250V ac 0.575in W57 - - - - - - - -
RS Stock No. 782-0911
Mfr. Part No.W28-XQ1A-3
$4.70
Each
units
3A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS Stock No. 344-5333
Mfr. Part No.1658-G21-02-P10-16A
BrandETA
$19.36
Each
units
16A 1 - - 32mm 1658 - - - - - - - -
RS Stock No. 333-243
Mfr. Part No.201-2A
BrandETA
$86.73
Each
units
2A 1 - - 80mm 201 - - - - - - - -
RS Stock No. 405-9135
Mfr. Part No.2-5700-IG1-P10-DD-000040-7A
BrandETA
$31.98
Each
units
7A 1 - - 29mm 2-5700 - - - - - - - -
RS Stock No. 167-5677
Mfr. Part No.W28-XQ1A-10
$4.70
Each
units
10A 1 - 32 V dc, 250 V ac - W28 - - 1000 A - - - - -
RS Stock No. 286-4216
Mfr. Part No.3120-F32F-H7T1-SGRX-10A
BrandETA
$42.53
Each
units
10A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 782-8041
Mfr. Part No.W58-XB1A4A-8
$8.09
Each
units
8A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 170-9405
Mfr. Part No.W28-XQ1A-10
$3.163
Each (In a Bag of 100)
units
10A 1 - 32 V dc, 250 V ac - W28 - - 1000 A - - - - -
RS Stock No. 417-010
Mfr. Part No.1110-F112-P1M1-10A
BrandETA
$40.70
Each
units
10A 1 - - 19mm 1110 - - - - - - - -
RS Stock No. 729-2764
Mfr. Part No.2-5700-IG2-P10-DD-16A
BrandETA
$50.69
Each
units
16A 1 - - - 2 5700 - - - - - - - -
RS Stock No. 729-2770
Mfr. Part No.3120-F554-P7T1-W02D-5A
BrandETA
$35.50
Each
units
5A 2 - - - 3120-F - - - - - - - -
RS Stock No. 782-7972
Mfr. Part No.W58-XB1A4A-1
$12.69
Each
units
1A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 406-9491
Mfr. Part No.2-5700-IG1-P10-DD-000040-25A
BrandETA
$27.54
Each
units
25A 1 - - 29mm 2-5700 - - - - - - - -
RS Stock No. 782-7969
Mfr. Part No.W54-XB1A4A10-10
$4.29
Each
units
10A 1 - 250V ac 0.575in W54 - - - - - - - -
RS Stock No. 335-974
Mfr. Part No.106-P30-000040-4A
BrandETA
$21.06
Each
units
4A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 273-0882
Mfr. Part No.1658-G21-02-P10-15A
BrandETA
$40.38
Each
units
15A 1 - - 32mm 1658 - - - - - - - -
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