Paragon tmr-24 and tm-4824 are most suitable timers for on delay/off delay application. It has user adjustable delay time range like 1.5/6/15/60 - sec/min/hrs. The on delay/off delay is user selectable with two change over relay output [5a @ 230 v ac]. Auxiliary supply voltage is from 24v ac/dc to 230v ac/dc. Tmr-24 is enclosed in 22.5 [w] * 75 [h] * 105 [d] mm for 35 mm rail mounting and tm-48 24 is for 8/11-pin plug in/front panel mounting 48 [h] * 48 [w] mm abs plastic housing.