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Rectorseal RSH-50 Surge Protective Device 50kA (96415) Power surges don’t ask permission before they destroy expensive HVAC equipment. The Rectorseal RSH-50 Surge Protective Device is built to help protect your air conditioner, heat pump, furnace controls, and other sensitive electrical components from sudden voltage spikes caused by lightning, utility switching, or unstable power. With a 50kA sur…