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A time switch is a timer that operates an electric switch controlled by the timing mechanism.
Intermatic introduced its first time switch in 1945, which was used for "electric signs, store window lighting, apartment hall lights, stokers, and oil and gas burners." A consumer version was added in 1952.
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 , plugged into a wall outlet with equipment plugged into the timer instead of directly into the power point; or built into equipment.
A sleep timer is a function on many modern televisions and other electronic devices that shuts off the power after a preset amount of time. The setting is usually made either from the remote control of the device or the device's menu. They are intended to allow viewers to watch as they fall asleep.