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. 782-8029
Mfr. Part No.W58-XB1A4A-3
R 128.28
Each
units
3A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS stock no. 170-9405
Mfr. Part No.W28-XQ1A-10
R 37.597
Each (In a Bag of 100)
units
10A 1 - 32 V dc, 250 V ac - W28 - - 1000 A - - - - -
RS stock no. 167-5677
Mfr. Part No.W28-XQ1A-10
R 40.66
Each
units
10A 1 - 32 V dc, 250 V ac - W28 - - 1000 A - - - - -
RS stock no. 782-6571
Mfr. Part No.W28-XQ1A-16
R 46.68
Each
units
16A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS stock no. 782-7934
Mfr. Part No.W57-XB7A4A10-20
R 46.52
Each
units
20A 1 - 250V ac 0.575in W57 - - - - - - - -
RS stock no. 782-0870
Mfr. Part No.W23-X1A1G-35
R 440.96
Each
units
35A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS stock no. 782-7931
Mfr. Part No.W57-XB7A4A10-15
R 38.28
Each
units
15A 1 - 250V ac 0.575in W57 - - - - - - - -
RS stock no. 782-8038
Mfr. Part No.W58-XB1A4A-6
R 87.95
Each
units
6A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS stock no. 782-7821
Mfr. Part No.W57-XB1A7A10-5
R 49.05
Each
units
5A 1 - 250V ac 0.575in W57 - - - - - - - -
RS stock no. 782-0860
Mfr. Part No.W23-X1A1G-15
R 376.32
Each
units
15A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS stock no. 782-0886
Mfr. Part No.W23-X1A1G-5
R 398.70
Each
units
5A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS stock no. 782-7855
Mfr. Part No.W68-X2Q12-15
R 715.16
Each
units
15A 2 - 277V ac 1.5in W68 - - - - - - - -
RS stock no. 782-6597
Mfr. Part No.W28-XQ1A-4
R 46.10
Each
units
4A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS stock no. 782-8016
Mfr. Part No.W54-XB1A4A10-30
R 52.56
Each
units
30A 1 - 250V ac 0.575in W58 - - - - - - - -
RS stock no. 782-7990
Mfr. Part No.W58-XB1A4A-25
R 77.66
Each
units
25A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS stock no. 782-6565
Mfr. Part No.W28-XT1A-15
R 56.77
Each
units
15A 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -
RS stock no. 782-0889
Mfr. Part No.W23-X1A1G-3
R 648.48
Each
units
3A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS stock no. 782-8041
Mfr. Part No.W58-XB1A4A-8
R 86.82
Each
units
8A 1 - 50 V dc, 250 V ac 0.66in W58 - - - - - - - -
RS stock no. 782-0864
Mfr. Part No.W23-X1A1G-20
R 376.44
Each
units
20A 1 - 50 V dc, 250 V ac 0.69in W23 - - - - - - - -
RS stock no. 782-0898
Mfr. Part No.W28-XQ1A-0.25
R 106.81
Each
units
250mA 1 - 32 V dc, 250 V ac 0.76in W28 - - - - - - - -