The ATC Phase Monitor Relays provide cost-effective protection against voltage faults in 3 phase systems (Wye or Delta). Easily adjustable for voltage, imbalance percentage, and time delay, they protect against unbalanced voltages or single phasing, ensuring reliable operation. Power Up 2.5 SEC MinimumFault Delay 1 to 25 SEC AdjustableSevere Fault 1 SEC Phase Loss Unbalance or Phase Reversal