| 摘要 |
A magnetic vacuum circuit breaker includes a sealed casing. Mounted in the casing are a stationary contact, a movable contact, a linkage connected to the movable contact, a tension for activating the linkage, and a stop device controllable by an electromagnet for normally hindering the linkage from the linking-up motion resulting from the tension force of the tension spring. A manual switch is provided for moving the movable contact to electrically connect with and disconnect from the stationary contact to thus close and open the circuit. An automatically indicating device is drivable by the linkage to indicate the state of overload or short-circuit when the circuit is converted into the same state. In addition, when the circuit is converted to the state of overload or short-circuit, the linkage is released from the stop device by the action of the electromagnet so that the movable contact is pulled by the tension spring away from the stationary contact to open the circuit. A pair of mutually attractable magnetic members are used to transfer motions between the linkage and the manual switch.
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