The Camco Power Grip RV 50-Amp Voltage Protector with Integrated Surge Protection helps protect your RV and appliances from high (>132 VAC) or low (<102 VAC) voltage levels and power surges. If dangerous conditions are detected, it will automatically disconnect; reconnecting only after the normal operating conditions have been restored. Diagnostic LEDs indicate wiring faults when you connect your electrical cord to the power pedestal. The voltage protector protects against faults for reverse polarity, open neutral and other wiring issues. Includes integrated surge protection of up to 4,200 Joules.