50 to 30 AMP RV Surge Protector: Features NEMA 14-50P & NEMA TT-30R connections and is rated for 125 volts/3750 watts. This RV surge protector can identify faulty RV park power, give your equipment 4200 Joules of the surge protector. Protects your RV from dangerously high or low voltage levels and power surges, keep your RV safe and guard your RV power system High performance: There is 8 MOV in the internal circuit board, greatly minimizes risk of fire from lighting strikes or sudden surges. Constructed with 100% pure copper with full 10 gauge wires ensuring high conductivity. The cord is coated with a heavy-duty flame retardant, heat resilient PVC sheath. Coming with a weatherproof cover for outdoor use, which protects the circuit from rain, wind and other hard conditions Circuit Analyzer: Our RV surge protector is designed with Indicator Light, which will identify and judge whether the RV power is safe.Together with the diagnostic chart provides LED indication guide for the fo