Camco 50 AMP Power Defender Voltage Protector With Integrated Surge Protection, Includes Easy To Use PowerGrip Handles Protects your RV from dangerous high (&gt;132 VAC) and low (&lt;102 VAC) voltage levels Automatically disconnects from dangerous voltage and reconnects after power stabilizes Shows faults for reverse polarity, open neutral, and other power pedestal wiring issues Integrated surge protection: 3,850 joules power rating for 50 Amps Diagnostic lights for visual indication of fault Protects your RV from dangerous voltage levels Automatically reconnects after power stabilizes Cautions user of power outlets wired with reverse polarity and/or voltage on ground Integrated surge protection Diagnostic lights for visual indication of faults