| 摘要 |
A remote control switch device having a main switch connected between a power supply and a load circuit, a control circuit having auxiliary contacts interlocking with the main switch, a first diode connected in series with the auxiliary contact, a second diode connected in a direction opposite the first diode coupled across the series circuit, an electromagnetic coil connected in series with the second diode for opening or closing the main switch, an isolating transformer connected to the power supply, and an operation indicating circuit having a push-button switch connected to the secondary side of the transformer and remotely connected to the control circuit. The remote control switch device employs as the main switch a keep relay which is mechanically retained at the open or closed position and controlled by the electromagnetic coil through simple signal communication lines.
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