1. It can be used to distribute electric energy, and the asynchronous motor will not be turned on frequently.
2. Turn on or off the load circuit to protect the motor and the power supply line. When the motor and the power supply line are severely overloaded, short-circuited or under-voltage faults, the circuit will be automatically cut off. The function is equivalent to the combination of overheating relay and fuse switch.
3. Cut off the faulty circuit to avoid more accidental safety accidents in the circuit, so as to ensure the safety of the user's electrical equipment. In addition, when the fault current is interrupted, its components generally do not need to be changed, so it is currently favored by consumers.