The 460 is a 3-phase voltage monitor that protects 190 to 480 VAC or 475 to 600 VAC, 50/60 Hz motors regardless of size. The product provides a user selectable nominal voltage set point and the voltage monitor automatically senses line voltage. This unique microcontroller based voltage and phase sensing device constantly monitors the 3-phase voltages to detect harmful power line conditions such as low, high and unbalanced voltage, loss of any phase and phase reversal. When a harmful condition is detected, the MotorSaver® output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to an acceptable level for a specified amount of time (restart delay). The trip and restart delays prevent nuisance tripping due to rapidly fluctuating power line conditions. All 460 models feature adjustable 1 to 30 s trip delay, 1 to 500 s restart delay, 2-8% voltage unbalance trip point and one form C contact except where noted below.