| 摘要 |
An air circuit breaker comprises: a make-and-break unit having a stator and a blade-shaped movable element rotatably supported with a support shaft; an electromagnetic operation unit having a fixed iron core, a movable iron core provided below the fixed iron core, a coil to produce an electromagnetic force, and a permanent magnet; a capacitor to store electric power to excite the coil; a control circuit board that controls a carrying direction of a current supplied from the capacitor to the coil in response to an input command or a breaking command to the make-and-break unit; and a servo mechanism provided above the electromagnetic operation unit and connected to the movable iron core, that transmits a driving force from the electromagnetic operation unit to the make-and-break unit.
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