Patent ID: 8570121
Filing Date: 2013-10-29
Classification: H01H

Abstract:
1. An air circuit breaker comprising: a make-and-break unit having a stator and a blade-shaped movable element disposed oppositely to the stator and rotatably supported with a support shaft; an electromagnetic operation unit having a fixed iron core provided in an upper position, a movable iron core provided in a position oppositely to the fixed iron core and provided below the fixed iron core, a coil to connect/disconnect the fixed iron core and the movable iron core with an electromagnetic force, and a permanent magnet; a capacitor that energy-stores electric power to excite the coil of the electromagnetic operation unit; 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; a servo mechanism connected to the movable iron core in the electromagnetic operation unit and provided above the electromagnetic operation unit so as to transmit a driving force by the electromagnetic force of the electromagnetic operation unit to the make-and-break unit; and a breaking spring with one end attached to a connecting pin of the servo mechanism and the other end attached to a bottom plate of the air circuit breaker, wherein the breaking spring is extended and energy-stored when the movable element in the make-and-break unit is inputted and the connecting pin is pulled upward.