Surge protection device for HVAC equipment from electrical damage. Designed to protect all single phase, 120/240-V air conditioning, heat pumps and ductless mini-split systems from transient over-voltage and natural-cause surge occurances. RSH-50 surge protector fits all single phase units. Easy to wire and install. Instantly protect HVAC equipment when installed; can surge protect a residential or commercal system. Mount surge protector in any position or an electrical panel box. Surge protection device protects HVAC system from electrical damages. LED light easily indicates proper power surge and electrical protection. Long-lasting gas disharge tube technology. RSH-50 Surge Protection device 120/240VAC; max discharge current per phase 50kA (1 hit); normal disharge current 10kA (15 hits). All single-phase protector. Protects up to 50,000-amp singular surge. FOR THE TRADESMAN: RectorSeal is recognized as a leading provider of quality solutions for the professional trades serving heating, ventilation, and air conditioning (HVAC/R), plumbing, electrical, and construction markets.