Features : Protection from Voltage Unbalance, Single Phasing, Reverse Phasing. Operates on low voltage (from 200 V) Useful for 3 Ph. 1 to 50 H.P, Openwell, Submersible, Monoblock Pumpsets. Duel colour LE,D indicator Green for OK & Redfor SPP. Technical Specifications Operating voltage : 220to 460 VAC, 50 Hz. SPP Trip time delay- 4 sec. Voltage Unbalance Set.-35 Vph. to ph. SPP -Voltage Sensing.