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try an on/off delay relay from OMRON. they are configurable in multiple ways for either on delay or off delay or continuous or cyclic operation. they will also do single cycle operation. i don't remember model # off the top of my head but we use them for analog control for older motor control systems. they're not cheap though. $180 wholesale sticks in my head, but i could be wrong too. they also can run on either 24v, 120v or 208v, etc.
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