The Dual Voltage Phase Monitor automatically selects which voltage-scale to operate from, either 200-240 VAC or 425-525 VAC.
When proper voltage is connected to the Phase Monitor, the internal relay of the Phase Monitor Relay will be energized and the LED will come on steady. An abnormal condition in the Phase Failure Relay will cause the LED to blink during thetrip delay. When the trip delay has expired the internal relay of the Phase Loss Relay will be de-energized. Neutral wires are NOT required.