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A circuit breaker is a device that cuts off current in the event of faulty circumstances, such as overvoltage or short circuit. Also, it prevents power surges and arcing by sensing changes in the amount of current and cutting it off. As opposed to fuse, it allows the circuit before excess current reaches dangerous levels. Here's how it does it. Different kinds of circuit breakers air circuit breakers molded circuit breakers and vacuum circuit breakers Used Circuit Breakers When a circuit draws enough current that it's overloaded. ... more