time switch

noun

an electric switch that can be set to operate an appliance, such as a light or an oven, at a particular time

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for time switch

Historical Examples of time switch

Patrolman Willis set a time-switch and pushed the overdrive button.
A Matter of Importance
William Fitzgerald Jenkins