| 摘要 |
PROBLEM TO BE SOLVED: To provide an electromagnetic contactor for adjustment capable of preventing an accident even if an internal relay circuit fails. SOLUTION: Relay circuits 201 and 202 are turned on in a normal time. Relay circuits 203 and 204 are turned off, so that current flows through an electron type watt-hour meter 300 and hence measurement is performed. While, relay circuits 201 and 202 are turned off and relay circuits 203 and 204 are turned on according to a measurement stop command, so that current flows via a short-circuit path and hence the current does not flow into the electron type watt-hour meter 300. Therefore, the measurement is stopped. Even if the relay circuits 201 to 204 fail, a diode section DU1 is formed between a terminal T8 and terminal T11 and hence a closed circuit is formed via the diode section DU1. Therefore, even if voltage is induced to both ends of the relay circuit, current is carried via the diode section DU1. COPYRIGHT: (C)2008,JPO&INPIT
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