Arc-extinguishing device of circuit breaker

The present invention provides for the arc during current interruption between the fixed contact and the movable arcing contact, and effectively exhibited by an arc generated squeeze arc extinguishing arc extinguishing device functions seek to improve the circuit breaking performance of the circuit breaker, the means used is as follows, i.e., the front end portion contacts comprising mounting the movable contact (2a) for enclosing the gear and the fixed contact (1) made of insulating material extending in one of the movable contactor (2) arc box separator (5), in that the fixed contact / movable arc (the arc) is generated between the contacts is pressed into the interior of the arc to the separator, by the high heat resistance and a ceramic or upon circuit breaking U-shaped structure housing a slit insulator made of high temperature hydrocarbon resin arcing contact arc generated gas constituting the separator, so that the left and right side walls of the distal side toward the fixed contacts and the movable contacts mounted on the front of the department.