This 7-Day Programmable Digital timer switch can be used to control electric hot water heating, resisitive electric heating systems, or high current lighting systems such as metal halide or sodium lighting. 

These timers are very popular for use with hydroponics grow lights where the 30 amp rating of this timer switch can make it suitable as a contactor relay.For lighting applications, this timer switch can power 2x 600w hps, 4 x 400w hps or 7 x 250w hps, or 8 x 250w cfl lightsIP55 rated rainproof, dustproof, splashproof, for indoor and outdoor usage
Unlike most conventional timers thisSINOTIMER timer is designed to handle the inductive load generated by HID/ Metal Halide or Sodium lamps. Cheaper timers with only 10A ratings will stick either on or off as the tiny contacts inside them weld together under the high inrush/ start up current created by HID, HPS or metal halide lamps.
This digital timer switch is also suitable for heavier duty lighting time switch operations such as shop display lighting or security lighting.Other applications can include control of heating circulation pumps or electric heating timer switch and many more. The 30A contactor will extend the life of the relay much further than many of the lower rated 13A timers commonly available.