| 摘要 |
PROBLEM TO BE SOLVED: To reduce an insulation distance, particularly, between a CR snubber circuit and another constituent component. SOLUTION: A ground-fault interrupter 1 includes a zero-phase current transformer 2 for outputting a signal by detecting electric leakage in main circuits 4, 4, an electric leakage detection circuit 5 for detecting electric leakage on the basis of the output signal of the zero-phase current transformer 2, a tripping mechanism 6 that opens each contact 6 provided in the main circuits 4, 4 by a magnetic force generated in a trip coil 11, into which an excitation current is made to flow, so as to trip the main circuits 4, 4 from a power supply, a thyristor 14 serially connected to the trip coil 11 so as to make an excitation current flow into the trip coil 11 on the basis of the output signal of the electric leakage detection circuit 5, and a snubber circuit 8 composed by connecting a capacitor 13 as a capacitive element and a resistor 12 as a resistance element in series. The snubber circuit 8 is connected to the thyristor 14 in parallel. The capacitor 13 is connected to the trip coil 11 side of the thyristor 14 while the resistor 12 is connected to the ground line side. COPYRIGHT: (C)2008,JPO&INPIT
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