RV Surge Protector 50 amp, POWSAF RV Power Defender Voltage Protector/Monitor with Surge Protection(4100 Joules), Designed with Easy to Use Handles… NEW! 50 amp Waterproof Surge Protector for RV : Identifies faulty park power plus offers 4100 Joules of surge protector. Protects your RV from dangerous high and low voltage levels as well as power surges. Designed for outdoor use, Weather resistant, All weather shield assembly. Power Watch Dog: Diagnostic LED, Provides fault indication when you connect the wire to the power base, Protects Against Wiring Issues, Protects against faults for reverse polarity, open neutral, and other wiring issues Designed with Easy To Use Handles: Contoured grips make plugging and unplugging easier.