| 摘要 |
PROBLEM TO BE SOLVED: To provide a ground leakage breaker wherein arc gas and metal melt generated between contacts when interrupting a current, are prevented from coming around between phases and into the storage space of a zero-phase sequence current transformer. SOLUTION: This ground leakage breaker has a structure in which stationary/movable contacts 6, 7 corresponding to each phase of a main circuit, an arc extinguishing device 9, an overcurrent trip device 13, an opening and closing mechanism 10, and the zero-phase sequence current transformer 13 are assembled in a molded case 1 having a divided structure composed of a case body 2 and a cover 3, and the inside of the molded case excepting the storage portion of the zero-phase sequence current transformer is partitioned by interphase barrier plates. A screen-shaped shielding wall to partition a space in the inside of the case into spaces on the power supply side and on the load side by interposing it between the overcurrent trip device in each phase and the zero-phase sequence current transformer standing side by side behind it, is provided in the inside of the molded case. The shielding wall is formed into a divided structure by vertically butting its upper wall against its lower wall, groove holes are cut and formed at the butting end part, and the shielding wall is inserted and fitted in the notch portion of the interphase barrier plate. A main circuit conductor 15 in each phase which is inserted through the zero-phase sequence current transformer by passing it through the groove hole is connected to the overcurrent trip device. COPYRIGHT: (C)2007,JPO&INPIT
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