RV Surge Protector Respond In 1ns - RV 50amp Surge Protector identifies faulty power supplies and offers 4200 joules of surge protection, Protects your RV from dangerous high and low voltage levels as well as power surges. 3 Modes of Protection: L-N,L-G,N-G (L：LIVE WIRE，N：NEUTRAL WIRE，G:GROUND WIRE). Response time: less than 1ns..Safety Guaranteed - BOYISEN RV Surge Protector is strictly tested, it's all structure ETL listed, not just cables or sockets, better safety performance. Specification: Rated 50A 125V/250V 3750W 4200 Joules Surge with 22,500 Max Spike Amps.Risk Free Circuit Analyzer - With fault identification LED indicator. Detects and protects you and your families from poor or unsafe electrical conditions such as: open ground, open neutral, reverse polarity, reverse ground and overheating..Designed for Outdoor Use - We use the premier flame retardant PVC material, resistant to high temperatures and will deformkills possible fires at the very beginning. You and your family can rest with peace of mind under the extreme weather..Improved Design - The clear sideway open case is not only weather resistant so as to protect your device from water and dust, also enable you easy to use the device and read the indicators. The security locking hole with lock and keys is to protect your property..Lifttime Replacement Policy - BOYISEN have strong confidence in our product’s quality and Lifttime Replacement Policy.