Kabushiki Kaisha Toshiba

Yasuharu Kanai

Kenji Watanabe

Yoshinobu Ishikawa

Hiroshi Ohashi

Hidetake Shiire

Makoto Taniguchi

An operation apparatus of a circuit breaker provided with a mobile contact and a fixed contact, the mobile contact is pressed against the fixed contact or drawn apart from the fixed contact, comprising an operation rod fixed to the mobile contact and held to be movable with respect to the fixed contact, a mobile member movably connected to the operation rod, a relative movable range of the mobile member to the operation rod being limited within a predetermined value, a first elastic member for urging the operation rod with respect to the mobile member in a direction in which the mobile contact is pressed against the fixed contact, a fixed member for movably holding the mobile member, a second elastic member for urging the mobile member with respect to the fixed member in a direction in which the mobile contact is drawn apart from the fixed contact, a permanent magnet for driving the mobile member with respect to the fixed member in a direction in which the mobile contact is pressed against the fixed contact, an operation electromagnet for applying a magnet force to the permanent magnet so as to drive the mobile member, and a power supply circuit for energizing the operation electromagnet.

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Yokohama, Japan

Yasuharu Kanai