Patent ID: 7005594

Claim:
A movable contactor assembly for a circuit breaker comprising: a rotation shaft provided with an opening for allowing independent rotating of a movable contactor at the time of a current limiting operation and having a cam surface on an outer circumferential surface thereof, for rotatably supporting the movable contactor; the movable contactor rotatably supported by the rotation shaft, symmetrically having a pair of contacts at both ends thereof and a pair of linear motion guiding grooves, and rotatable to a contacted position to fixed contactors or a separated position from the fixed contactors; a pair of slide pins disposed across both lateral surfaces of the rotation shaft, linearly movable in the linear motion guiding grooves, and maintaining a contact state to the cam surface of the rotation shaft under a state that the movable contactor is in contact with the fixed contactors, for providing a pressure to the movable contactor in a direction to accelerate a separation of the movable contactor from the fixed contactors with being separated from the cam surface and thereby being slid along an outer circumferential surface of the rotation shaft at the time of a current limiting operation that the movable contactor is separated from the fixed contactors to be rotated; and a spring for providing an elastic force to the slide pins so that a contact between the movable contactor and the fixed contactors can be maintained under a state that the movable contactor is in contact with the fixed contactors, and for providing an elastic force to the slide pins in a direction to accelerate a separation of the movable contactor from the fixed contactors at the time of a current limiting operation that the movable contactor is separated and rotated from the fixed contactors in contrast to the static rotation shaft.