Time switch

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time switch

[′tīm ‚swich]
(engineering)
A clock-controlled switch used to open or close a circuit at one or more predetermined times.

Time switch

A clock that has built-in switches to control the time at which lights or other electrical devices go on or off.
References in periodicals archive ?
And use time switches to turn lights and radios on and off while you're out.
Buy time switches to switch lights on if you're out in the evening.