TORK mechanical time switches simplify your life by automating repeating parts of your schedule, saving you time, energy and money. Use the TORK P49 replacement pair trippers to easily set ON/OFF cycles with a minimum ON time of 20 minutes and a minimum OFF time of 75 minutes using TORK 7000 series 24-hour mechanical time dials. One pair of trippers is included with each dial. When it comes to timekeeping and electrical automations you can count on, trust in the reliable name of TORK, a pioneer in the industry since 1922.