Model: W-OP4

The W-OP4 Phase Protection Relay is a digital electronic instrument designed for AC voltage monitoring and protection in 3 phase 4 wire and 3 phase 3 wire system. Used in application such as main failure, phase unbalance, under and over voltage. When the measured voltage moves outside the set-point limit, the relay will de-energize after the time delay, it operates automatically and shut down your motor before any damage is done. The relay will automatically reset to energize when the input voltage is raised past the set-point plus the hysteresis value,