_________ is the safety device does not have to be changed when excess current flows through it.

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Solution

An electrical circuit breaker is a switching device which can be operated manually and automatically for controlling and protecting an electrical power system.
It is used to protect electrical devices from damage.
Unlike a fuse, it can be used again and again.
Hence, the circuit breaker is a safety device that does not have to be changed when excess current flows through it.

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