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Rev. Notes > IGCSE > Dangers of Electricity
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Damaged insulation Overheating of cables Damp conditions
Fuses Circuit breakers

Circuit breakers

A circuit breaker is an automatic switch which cuts off the current in a circuit if this rises above a specified value. It has the same effect as a fuse but, unlike a fuse, can be reset (turned ON again) after it has tripped (turned OFF).


In the type shown above, the current flows through two contacts and aslo through an electromagnet. If the current gets too high, the pull of the electromagnet becomes strong enough to release the iron catch, so the contacts open and stop the current.

Pressing the reset button closes the contact again.

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  19/04/12 05:42 PM


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