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ICM Controls ICM517 Single Phase Surge ProtectionICM 517 Single Phase Surge Protective Device with metal, NEMA Type 3r Rated enclosure. 100,000 amp 1,020 joules of protection. UL Listed.Features of ICM Controls ICM517 Single Phase Surge Protection Single Phase Surge Protective Device UL Listed, Type 2 Device Metal, NEMA Type 3r Rated Enclosure Rugg..