Circuit breaker

A circuit breaker, comprising:

• a circuit breaker body comprising a stationary contact, a movable contact, and a handle;
• a circuit control board comprising an automatic closing unit and a pinion-and-rack mechanism, the pinion-and-rack mechanism comprising a pinion, a frame body, and a rack;
• a motor adapted for pulling and pushing the handle;
• a wire inlet end;
• and
• a wire outlet end arranged in said circuit breaker body;
• wherein:
• the pinion is connected to the motor;
• the frame body is contacted with the handle;
• the rack is disposed between the pinion and the frame body for transforming the rotation of the motor into a reciprocating action of the handle;
• and
• the automatic closing control unit comprises:
• a power collection subunit obtaining a power signal from a phase line and rectifying and filtering the power signal;
• and
• a motor motion control subunit obtaining the power signal, allowing the motor to move after receiving a closing command, and ultimately realizing the closing action of the circuit breaker.