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A time switch (also called a timer switch, or simply a timer) is a timer that operates an electric switch controlled by the timing mechanism. The switch may be connected to an electric circuit operating from mains power, including via a relay or contactor; or low voltage, including battery-operated equipment in vehicles. It may be built into power circuits (as with central heating or water heater timer), plugged into a wall outlet with equipment plugged into the timer instead of directly into the PowerPoint; or built into the equipment.
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