From Longman Dictionary of Contemporary Englishtime switchˈtime switch noun [countable] TEESTART something/MAKE something STARTan electronic control that can be set to start or stop a machine at a particular time
Examples from the Corpus
time switch• A time switch can accurately control the photoperiod.• A time switch disconnects the heating coil after it has had time to warm the lock.• A time switch is useful, but not essential.• If an automatic time switch is available, this greatly simplifies the keeping of a regular lighting schedule.• Use an automatic time switch on your lighting. 