| 摘要 |
PROBLEM TO BE SOLVED: To prevent breakdown such as a burnout even in reversed connection by quick electrical leakage blocking operation even if one phase is interrupted. SOLUTION: A three-phase ground-fault interrupter includes a three-phase full-wave rectifier circuit 7a to supply operation electric power to an electrical leakage determining circuit 6, and a first thyristor S1 and a second thyristor S2 to make a trip coil 4 carry out a trip movement, and if the electrical leakage determining circuit 6 detects electrical leakage, by switching on the first and the second thyristors S1, S2, the trip coil 4 is made to carry out the trip operation. The trip coil 4 includes a third and a fourth thyristors S3, S4 which receives supply of operation current from two phases different in a cable run 1, in which the first and the second thyristors S1, S2 are respectively arranged on its two electrical current supplying passages 8 in parallel, and which is switched on in series in conjunction with on operation of the first and the second thyristors S1, S2. COPYRIGHT: (C)2009,JPO&INPIT
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