| 摘要 |
PROBLEM TO BE SOLVED: To obtain a small ground-fault interrupter capable of reverse connection without adding a component such as a switch to turn on or off supply of an operating power, while receiving the operating power from each phase of a three-phase electric path. SOLUTION: The ground-fault interrupter is provided with a zero phase current transformer in which three power lines of a three-phase electric path are inserted, and detects leakage current of the three-phase electric path, a leakage detection circuit to carry out level determination of a signal detected by this zero phase current transformer, an electromagnet device to operate a switch mechanism in response to the output of this leakage detection circuit, and an electric path contact opened and closed by the operation of the switching mechanism. The leakage detection circuit and the electromagnet device receive supply of operating power from the three electric lines of the three-phase electric path through a rectifier circuit, and the rectifier circuit is a half-wave rectified current and the electromagnet device is connected to the following stage of the half-wave rectified current. COPYRIGHT: (C)2007,JPO&INPIT
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