This series of mechanical time switches offers more flexible scheduling capabilities by offering 15-minute intervals. All units can control up to 20 A of electrical load and have a single pole, double throw switch.24-Hour Mechanical Time Switch, 125 VAC, 60Hz, SPDT, Indoor Metal Enclosure, 15 Minute Interval Control is new without the original box has some light scratches from being in the truck but NOTHING to compromise the performance. One side knock out was removed but a electrical knock out plug can be snapped back in withing seconds Model # T-1905 Allows your commercial or residential Heating/Cooling/Boiler unit to be on/off every 15 minutes or on for 2 hours and off for 30 minutes etc