These heavy duty, grounded timers are ideal for automatically controlling air conditioners, personal computers, heaters, heavy-duty appliances and HID lighting fixtures. They plug directly into a wall outlet. Featuring 3 ON/3 OFF settings per day, 3-prong grounded plug and receptacle and a manual override on/off switch. HB112C - 3750W/250/2H.P./240V Maximum motor load.