Circuit breaker manual opening and closing device for closing resistance detection and circuit breaker

The invention relates to a circuit breaker manual opening and closing device for closing resistance detection and a circuit breaker, the circuit breaker manual opening and closing device comprises two door frame connecting plates mounted on a door frame of the circuit breaker, a speed reducer mounting seat is mounted on the door frame connecting plates, and a speed reducer with a self-locking function is mounted on the speed reducer mounting seat. The speed reducer is provided with an output end and an input end, the output end is connected with a transmission shaft, and the end part of the transmission shaft is connected with an outer crank arm connecting seat for driving an outer crank arm of an arc extinguish chamber of the circuit breaker to act; a first long hole is formed in one of the door frame connecting plate and the speed reducer mounting seat, a second long hole is formed in the other one of the door frame connecting plate and the speed reducer mounting seat, the first long ...