Fuji Electric Co., Ltd.

Hiroshi Kinota

Kiyoshi Kandatsu

Makoto Yamazaki

A contactor device for a circuit breaker includes a stationary contactor having a stationary contact, and a stationary conductor secured with the stationary contact and constituting an electricity path extending from an external terminal to the stationary contact, and a movable contactor having a movable contact movable to detachably touch the stationary contact, and a movable conductor secured with the movable contact and constituting an electricity path extending from the movable contact to another external terminal. The contactor device further includes a stationary core made of a ferromagnetic material with a gap between both ends of the stationary core and surrounding the stationary conductor, a movable core provided at a distance from said stationary core to be attracted toward the stationary core by a magnetic flux generated in the stationary core by an excessive overcurrent flowing through the circuit breaker, and an electrically insulating plate movable in a direction perpendicular to that of separation of the movable contact from the stationary contact, so that the insulating plate is moved together with the movable core and inserted into a space between the stationary contact and the movable contact at the time of the attraction of the movable core toward the stationary core, when the breaker cuts off the overcurrent.

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Kanagawa, Japan

Hiroshi Kinota