The Intermatic T104P3 Indoor / Outdoor pool equipment and light timer is a heavy duty mechanical time switch designed for industrial, commercial and residential applications. Intermatic time switches have the highest horsepower ratings in the industry for loads up to 40 amps resistive. The T104R3 is rated for 208 to 277 volts and provides direct 24 hour time switch control of most loads. This series provides 1 to 12 ON / OFF operations each day with a minimum ON/OFF time of 1 hour. All models are equipped with one ON and one OFF tripper. The T104P3 has a plastic housing.