This power relay uses high amperage capacity contacts to transfer power to large fans, pumps or lighting systems requiring high voltage or amperage service. Prevents premature failure of equipment, timers or other switching controls due to excessive current draw. Allows switching of 240 VAC equipment with 115 VAC controls. Prevents equipment overheating due to insufficient power supply. Use the HAR-1 to operate 115 or 240 volt high draw equipment. Provides 30 amp switching capacity with 115 VAC trigger input from control device. Approved for indoor use only.