| 摘要 |
PROBLEM TO BE SOLVED: To provide a three-phase ground-fault interrupter with interruption operation time shortened, and free from burn out even in case of reverse connection. SOLUTION: The three-phase ground-fault interrupter is provided with a full-wave rectifying circuit 7a connected to all of the three phases of an electric circuit 1 for supplying a power source to a leak detecting circuit 5, and a pair of thyristors 8a, 8b connected in parallel for supplying drive current directly to a trip coil 4 from different phases of the electric circuit. A leak judgment circuit 6 drives the trip coil 4 by putting on the pair of thyristors 8a, 8b at the same time, when electric leakage occurs. COPYRIGHT: (C)2009,JPO&INPIT
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