noun
a switch that can be set to start and stop a machine working automatically at a particular time :
The heating is on a time switch.
noun
a switch that can be set to start and stop a machine working automatically at a particular time :
The heating is on a time switch.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005