Single throw time switch will run heavy duty appliances such as fountain and waterfall pumps, water heaters, air conditioners, pool pumps and other heavy duty equipment. Settings repeat at the same time daily. Up to 48 cycles per day. Features include multiple voltage on one unit ( 120, 208/240, and 277V), an industrial-grade locking box and never-lose pins that won't come out. Manual ON/OFF switch. 120-277 Vac, 1 HP. Should be installed by licensed electrician.