A circuit breaker with quick response and separation and a quick response and separation method for the circuit breaker. The circuit breaker comprises a breaking contact group and a joint contact group. The breaking contact group comprises a movable breaking contact. The joint contact group comprises a movable joint contact. A movable contact limiting device used for limiting moving positions of the breaking contact and/or the joint contact is arranged between the breaking contact group and the joint contact group. The quick response and separation method for the circuit breaker comprises a breaking and opening step, wherein the breaking contact moves in a reverse direction and is separated independently ahead of the joint contact, or the breaking contact and the joint contact both move in a reverse direction and are separated at the same time.
