simple cheap delay start relay?
Try your favorite china supplier and look for an on delay relay, they are only a few bucks, some are fixed some are adjustable. Normally open, on-delay timers start timing when the input voltage (power) is applied. The output is energized at the end of the delay. Input voltage has to be removed to de-energize the output and reset the time delay relay. You can use google and try searching for &quot;on delay relay&quot; and click on shopping to find them for sale.