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A small high voltage rated capacitor is often used over a mains power switch with the intention to reduce the spark which might occur within the switch, particularly when switching off the unit. The intention is to reduce stress on the switch's contacts and to reduce impairments on the mains distribution.

Most modern devices, however, are permanently under power. When 'off,' they draw a small amount of power to sustain vital functions such as sensing of an electronic on/off switch and monitoring the infra red receiver required to turn on the unit using a remote control. On/off switches designed in this manner do not incur the spark mentioned above, and their surrounding circuitry is generally designed differently.

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Q: Is capacitor used in TV on and off button?
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