A circuit breaker refers to a switching device that can close, carry, and break the current under normal circuit conditions, and can close, carry, and break the current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The division of high and low voltage boundaries is relatively vague, and generally, those above 3kV are referred to as high-voltage electrical appliances. Circuit breakers can be used to distribute electrical energy, infrequently start asynchronous motors, protect power lines and motors, and automatically cut off circuits in the event of severe overload, short circuit, and undervoltage faults. Their function is equivalent to a combination of fuse switches and over/under heat relays. Moreover, it is generally not necessary to change the components after breaking the fault current. It has been widely used. Distribution is an extremely important link in the generation, transmission, and use of electricity. The distribution system includes transformers and various high and low voltage electrical equipment, while the low-voltage circuit breaker is a widely used electrical appliance
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