Littelfuse 111-Insider-P Single-Phase PumpSaver Plus 115VLittelfuse 111 Insider P Single Phase PumpSaver Plus Product Description The Littelfuse 111 Insider P single phase products fit inside 1 3 and 1 2 115V control boxes and are designed to protect single phase pumps from dry well, dead head, jammed impeller, rapid cycle, overvoltage, and undervoltage conditions. A calibration adjustment allows the Insider to be calibrated to your specific pumping applications, thereby reducing the possibility of false or