| 摘要 |
PROBLEM TO BE SOLVED: To improve the layout and assembly structure of parts to attain simplification of maintenance-inspection and internal wiring in combination with common use of interior parts for an earth leakage breaker equipped with a mega-test switch. SOLUTION: The earth leakage breaker formed by mounting an opening/closing mechanism 3 for main circuit contacts, a zero-phase current transformer 6, an earth leakage detecting circuit 7, a trip coil unit 8, and a mega-test switch 11 connected to a power circuit for supplying power to the earth leakage detecting circuit from a main circuit, inside a body case 12 formed of a case and a cover, is constituted to operate the mega-test switch off during a mega-test of the earth leakage breaker to disconnect the earth leakage detecting circuit from the main circuit. The earth leakage detecting circuit, the trip coil unit and the mega-test switch are individually unitized, and then the respective units are convergently arranged on the side of the zero-phase current transformer inside the body case. In this position, an operating button 11b of the mega-test switch is placed to face a switch operating hole opened to the cover of the body case. COPYRIGHT: (C)2008,JPO&INPIT
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