TImer switch sicks
Sorry, but your post doesn't make any sense.
If it is a mechanical timer, when you set the time, it starts a clockworks mechanism that closes contacts for the length of time set, and then opens the contacts, to shut of the bathroom fan, for example. If it is a purely electrical type of timer, a motorized clock does the timing for opening a set of contacts and shutting off the ventilating fan.
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