Circuit Breaker as a switch device that can switch on, carry and break the current under normal circuit conditions, and can also switch on and carry a certain time and break the current under specified abnormal circuit conditions, is an indispensable part of the power system. Its main function is to turn on, carry and break current under normal or abnormal loop conditions. This switching device can automatically cut off the circuit within a specified time to prevent equipment damage or fire caused by circuit overload, short circuit, undervoltage and other faults. The circuit breaker combines the functions of the fuse switch and the over-under-heat relay, which can act quickly when abnormal current is detected to protect the safety of the circuit and electrical equipment.

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