| 摘要 |
PROBLEM TO BE SOLVED: To provide a space-saving ground-fault interrupter of a simple structure equipped with a switch for voltage withstanding test so as to be able to respond to a voltage withstanding test carried out after shipment. SOLUTION: The ground-fault interrupter having an overcurrent and leakage protection functional parts mounted on a single body case 11 is equipped with a manual operation switch for voltage withstanding test turning on and off a power feeding circuit feeding interphase voltage of a main circuit to a leakage detecting circuit 7. The switch is structured of an electrode plate 22 for power supply mounted on a printed board 7a of the leakage detecting circuit 7 to be directly pressed against a main circuit conductor 1a (a primary conductor penetrating a zero-phase-sequence current transformer 6), and a switching operation piece 24 made of an insulating material intercalated between the electrode plate and the main circuit conductor for attaching and detaching the electrode plate to and from the main circuit conductor by a manual operation, with a knob part 24a of the switching operation piece made to faced a window hole opened to a cover of the interrupter case. Further, the leakage detection circuit is disconnected from the main circuit by the knob part drawn out to an OFF position at implementation of the voltage withstanding test. COPYRIGHT: (C)2005,JPO&NCIPI
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