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Circuit Breakers. A circuit breaker is a device that automatically breaks an electrical circuit whenever the circuit becomes overloaded or an unintentional short circuit occurs.

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Introduction

Circuit Breakers

What is circuit breaker?

A circuit breaker is a device that automatically breaks an electrical circuit whenever the circuit becomes overloaded or an unintentional short circuit occurs.  Circuit breakers have a set electric current load capacity which when breached results to automatic circuit shutdown.

Overloading occurs whenever the wires comprising an electrical circuit are forced to carry and conduct an electric charge beyond their capacity. Whenever this happens, the wires heat up. This may result in insulation breakdown (in which a short circuit may occur) or an electrical fire.

An unintentional short circuit occurs when electricity

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Middle

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What advantages does a circuit breaker have over the fuse?

Circuit breakers only need to be reset after use whereas a

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Conclusion

The second type of circuit breaker uses heat to break a circuit. A thermal circuit breaker has a bimetallic strip, which is a strip of material that has two types of metal welded together. The two metals expand with heat but each metal does so at a different rate from the other. Thus, the metal strip bends with the heat generated by the electric current flowing through the circuit. At dangerous heat levels, the strip would be bent at a certain angle that would be enough to pull the circuit breaker's lever down and sever the connection between the circuit breaker's contact plate and the circuit's stationary contact plate

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