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. 849-5914
Mfr. Part No.CB181F-100
MYR319.06
Each
units
100A 1 - 30V dc - CB181F - - - - - - - -
RS Stock No. 849-5920
Mfr. Part No.CB187F-110
MYR373.07
Each
units
110A 1 - 48V dc - CB187F - - - - - - - -
RS Stock No. 849-5923
Mfr. Part No.CB185-25
MYR502.30
Each
units
25A 1 - 48V dc - CB185 - - - - - - - -
RS Stock No. 849-5936
Mfr. Part No.CB251-10
MYR86.992
Each (In a Pack of 10)
units
10A - - 32V dc - CB251 - - - - - - - -
RS Stock No. 849-5926
Mfr. Part No.CB185-30
MYR502.30
Each
units
30A 1 - 48V dc - CB185 - - - - - - - -
RS Stock No. 849-5939
Mfr. Part No.CB187F-150
MYR373.07
Each
units
150A 1 - 48V dc - CB187F - - - - - - - -
RS Stock No. 849-5945
Mfr. Part No.CBC-50HB
MYR33.553
Each (In a Pack of 10)
units
50A - - 14V dc - CBC-HB - - - - - - - -