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. 782-0867
Mfr. Part No.W57-XB7A4A10-10
$4.66
Each
units
10A 1 - 250V ac 0.575in W57 - - - - - - - -
RS Stock No. 782-7938
Mfr. Part No.W57-XB7A4A10-5
$4.64
Each
units
5A 1 - 250V ac 0.575in W57 - - - - - - - -
RS Stock No. 782-7922
Mfr. Part No.W57-XB1A7A10-15
$5.49
Each
units
15A 1 - 250V ac 0.575in W57 - - - - - - - -
RS Stock No. 167-5677
Mfr. Part No.W28-XQ1A-10
$7.13
Each
units
10A 1 - 32 V dc, 250 V ac - W28 - - 1000 A - - - - -
RS Stock No. 173-9828
Mfr. Part No.4400.0015
BrandSchurter
$9.701
Each (In a Box of 100)
units
8A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 284-5861
Mfr. Part No.4400.0015
BrandSchurter
$16.91
Each
units
8A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 782-0921
Mfr. Part No.W28-XQ1A-7
$4.63
Each
units
7A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS Stock No. 782-7994
Mfr. Part No.W58-XC4C12A-25
$11.93
Each
units
25A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 286-0719
Mfr. Part No.3120-F551-H7T1-W02D-16A
BrandETA
$48.92
Each
units
16A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 405-9113
Mfr. Part No.2-5700-IG1-P10-DD-000040-1A
BrandETA
$34.77
Each
units
1A 1 - - 29mm 2-5700 - - - - - - - -
RS Stock No. 272-858
Mfr. Part No.GV3L65
$438.52
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 712-7648
Mfr. Part No.3120-F551-H7T1-W14DR4-16A
BrandETA
$53.17
Each
units
16A 2 - - 25mm 3120 - - - - - - - -
RS Stock No. 782-0927
Mfr. Part No.W58-XB1A4A-7
$10.56
Each
units
7A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS Stock No. 336-012
Mfr. Part No.106-P30-000040-1A
BrandETA
$30.40
Each
units
1A 1 - - 19mm 106-P30 - - - - - - - -
RS Stock No. 272-937
Mfr. Part No.GV3P65
$665.84
Each
units
- 3 TeSys 690V ac 55mm GV3 - - 5 kA - - - - -
RS Stock No. 284-5877
Mfr. Part No.4400.0003
BrandSchurter
$16.91
Each
units
10A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 782-8016
Mfr. Part No.W54-XB1A4A10-30
$7.74
Each
units
30A 1 - 250V ac 0.575in W58 - - - - - - - -
RS Stock No. 312-3689
Mfr. Part No.GB2CB12
$43.45
Each
units
6A 1 - 277 V ac, 415 V ac 15mm GB2 - - 1 (dc) kA, 1.5 (ac) kA - - - - -
RS Stock No. 173-9827
Mfr. Part No.4400.005
BrandSchurter
$12.873
Each (In a Box of 100)
units
6A 1 - 240V ac - T11 - - - - - - - -
RS Stock No. 286-4159
Mfr. Part No.3120-F521-H7T1-W01D-16A
BrandETA
$71.25
Each
units
16A 2 - - 25mm 3120 - - - - - - - -
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