| 摘要 |
A motor operator with a continuity sensor has a test current injector and a voltage sensor arranged to determine if a loss of AC voltage is due to a discontinuity, such as a blown fuse, in the circuit of a transformer powering the motor operator rather than a loss of voltage from an AC power line. A line voltage detector, such as a resistive or capacitive voltage divider, can also be used with a continuity sensor to distinguish between a discontinuity in the voltage detector and a loss of line voltage. Based on the cause determined by the continuity sensor, signals are generated either to motor operate a disconnect switch or not to.
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