The RSH-1203P-480D Type 1 Surge Protective Device (SPD) is a reliable surge protector for three-phase 480V delta HVAC systems. It prevents electrical damage, improves power quality, and reduces EMI/RFI interference. Weather-rated (NEMA 4X), compact, and equipped with clear LED status indicators, it features advanced GDT technology without ongoing upkeep. Uses long-lasting gas discharge tube (GDT) and thermally-fused metal oxide varistors (TFMOV) technology. Includes dual diagnostic LEDs and audible alarm. Type 1 SPD, NEMA 4X, and IP66 rated.