DAYTON TIME CLOCK TRIPPERS ? 2 On and 2 Off Switch For Many Dayton Timers And Most Intermatic Clocks listed below. ? ? UL and CSA listed Intermatic Timer Trippers are used in conjunction with Intermatic Timers in the following series: WH, T100, T101, T102, T102-20, T103, T104, T104-20, T170. The 156T1978A Timer trippers are placed on the timing wheels of certain Intermatic timers to control the timing cycle. In these pairs, the silver the green tripper activates the timing cycle and the gold trippers will shut the cycle off.