SPRING-OPERATED MECHANISM, CLOSING LATCH SYSTEM, AND CIRCUIT BREAKER

The present invention relates to a spring-operated mechanism, a closing latch system, and a circuit breaker. The spring-operated mechanism comprises a frame, on which an output shaft, a sector plate rotating shaft, and an opening half shaft which are parallel to each other are disposed; a transmission crack arm is disposed on the output shaft, and the transmission crank arm is provided with a holding arm; a notch is formed on the opening half shaft, and the bottom of the notch is a flat surface; a sector plate is disposed on the sector plate rotating shaft, a sector plate return spring is disposed between the sector plate and the frame, the sector plate is provided with a holding protrusion and a half shaft matching portion, the half shaft matching portion has a matching surface, and the matching surface is used for matching with the flat surface of the notch; the matching surface is an arc-shaped surface, and the center line corresponding to the arc-shaped surface coincides with the axis of the sector plate