Circuit breaker and arc extinguish chamber thereof

The invention relates to a circuit breaker and an arc extinguish chamber thereof. The arc extinguish chamber for the circuit breaker comprises a fixed seat, a movable end part is assembled on the fixed seat in a guiding manner, the arc extinguish chamber further comprises a static end part matched with the movable end part, the movable end part comprises a movable contact assembly and a nozzle assembly, and the nozzle assembly is matched with the fixed seat to form an air compression cavity during opening. The movable contact assembly comprises a movable arc contact located in the compressed air cavity; the nozzle assembly and the movable contact assembly are movably assembled on the fixing base in a guiding mode, the nozzle assembly and the movable contact assembly move relatively in the using process; the arc extinguish chamber further comprises a transfer device, and the transfer device is provided with a power input end used for being connected with an operating mechanism, and is also provided with a nozz