Linkage mechanism of circuit breaker and circuit breaker

The invention discloses a linkage mechanism of a circuit breaker. The linkage mechanism comprises a link rod, a functional part and a jump pin. The link rod is rotatably connected with the switch handle. The functional part can be arranged on the frame body. The jump pin is rotatably connected with the link rod, the jump pin is provided with a linkage end and a locking end, and the linkage end is connected with the tripping mechanism. When the lock catch is located at the locking position, the lock catch can limit the movement of the locking end, and the switch handle moving between the closing position and the opening position can drive the jump pin to enable the linkage end to move so as to drive the tripping mechanism. When a circuit generates a fault current, the lock catch moves to a release position to release the limitation on the movement of the locking end, the locking end instantaneously moves to a tripping linkage position, and the elastic restoring force of the handle elastic piece acts on the jum