The SymCom MotorSaver Model 201A is an auto ranging 8-pin, plug-in voltage monitor designed to protect 190-480VAC, 3-phase motors regardless of size. It is used to prevent damage caused by single-phasing, low voltage, phase reversal and voltage unbalance conditions. The unique microcontroller-based voltage and phase-sensing circuit constantly monitors the voltages to detect harmful power line conditions. When a harmful condition is detected, the unit’s output relay is deactivated after a specified fixed trip delay. The output relay reactivates after power line conditions return to an acceptable level and a specified fixed amount of time has elapsed (restart delay). The trip delay prevents rapid or short cycling due to rapidly fluctuating power line conditions.