Circuit breaker

A circuit breaker, comprising:

• a housing having, in a first direction, a bottom and a top opposite to each other, an accommodation portion recessed from the top to the bottom, and an accommodation cavity semi-surrounding the accommodation portion, wherein a rotating wheel and a movable contact connected to the rotating wheel are provided in the accommodation cavity close to the top and adjacent to the accommodation portion in a second direction, and the first direction intersects the second direction;
• an operation assembly rotatably and detachably connected to the top of the housing;
• an arc extinguishing device comprising an arc extinguishing chamber located in the accommodation cavity and close to the bottom;
• a transmission mechanism for transmitting, to the rotating wheel, a first signal sent by the operation assembly in the second direction, so as to drive the movable contact to move;
• and
• a locking mechanism, wherein the locking mechanism and the operation assembly are synchronously stored in the accommodation portion, and the locking mechanism sends a second signal which is transmitted by the transmission mechanism to the rotating wheel in the second direction, so as to drive the movable contact to move;
• wherein the locking mechanism comprises a first locking member and a second locking member capable of locking each other, the second signal is transmitted to the transmission mechanism via the first locking member and the second locking member, and an abutting point between the first locking member and the second locking member is located between the arc extinguishing chamber and the transmission mechanism;
• the locking mechanism further comprises a third locking member and a fourth locking member, the second locking member and the third locking member are capable of locking each other, the third locking member and the fourth locking member are capable of locking each other, a release is provided in the accommodation cavity on a side, away from the rotating wheel, of the accommodation portion, the release sends the second signal to the fourth locking member, and an abutting point between the second locking member and the third locking member is located between the arc extinguishing chamber and the transmission mechanism.