The Model 233-P single-phase Pump Saver Plus is a pump monitor designed to protect single-phase pumps from dry-well, dead-head, jammed impeller, rapid cycle and overvoltage and undervoltage conditions. The Pump Saver Plus Model 233-P protects 230 volt, 2 or 3 wire, 1/3 to 3 hp pumps.A calibration adjustment allows the Model 233-P to be calibrated to your specific pumping applications, thereby reducing the possibility of false or nuisance tripping. A proprietary microcontroller-based voltage, power factor, and current-sensing circuit constantly monitors for power fluctuations, overcurrent, and underload conditions. When an abnormality, such as loss of suction, is detected, the; PumpSaverPlus deactivates its output relay and directly disconnects the pump motor. The PumpSaver Plus then begins its user-selectable Restart Delay (dry-well recovery) timer. When the timer expires or power is removed and reapplied, the PumpSaver Plus reactivates its output relay and turns the pump back on.