Switch cabinet and circuit breaker emergent separating device thereof

The invention relates to the field of electrical devices, in particular to a switch cabinet and a circuit breaker emergent separating device thereof. The separating device comprises an actuation piece. The actuation piece comprises an actuation piece working position and an actuation piece avoiding position. When a circuit breaker needs to be emergently separated, an operation part drives the actuation piece to move, and the actuation piece moves to the actuation piece working piece from the actuation piece avoiding place to push a rotation shaft protrusion part to move so as to allow a separating half shaft to be separated under the driving of the rotation shaft protrusion part, thereby achieving emergent separation on the circuit breaker. When the circuit breaker controls separation andclosing through an electrical loop, the actuation piece is kept in the actuation piece avoiding place under the effect of the elastic reset piece, the separation half shaft will not intervene the actuation piece in the rotati