| 摘要 |
A safety switch for connection in a circuit to an electric machine has at least one contact closing member which is held in a position to close the circuit so long as current flows through an electromagnet coil connected to a supply. If the current fails the circuit cannot be reclosed on resumption of the current until a push button on the switch is pressed. A safety device comprising a bimetal strip may be provided to close the switch in the event of current overload.
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