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Yes, It is possible to use the Vigirex RH99 relay to protect a single phase load circuit.
If the load is connected between phase and neutral the two wires have to pass through the sensor. Same approach if the load is connected between two phases the two wires have to pass through the sensor.
Please refer the attached file where all possibilities of wiring for Single phase, 2 phase, 3 phase application is given.
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