A circuit breaker refers to a switching device that can close, carry, and break current under normal circuit conditions and can close, carry, and break current under abnormal circuit conditions within a specified time. It can be used to distribute electrical energy infrequently. It starts the asynchronous motor and protects the power line and motor. It can automatically cut off the circuit when serious overload, short circuit, undervoltage and other faults occur. Its function is equivalent to the combination of fuse switch and overheating and underheating relay, etc., and There is generally no need to change components after breaking the fault current. Has been widely used.
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