It came to an application in which I need to keep a load turned ON for an x amount of minutes. My toolbox only included inexpensive timed board which worked just the opposite, turning-on delay for suppressing rush current during power on cycles. If this may be your case, and you will like to have an inexpensive circuit to serve for both situations ( activate or de-activate a relay after an event), this circuit may help. For simplicity, I mounted the board into a piggyback power outlet, Included find the vendors in case you need to order.
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Amazon.com: Generic 12V Delay Timer Switch Adjustable Module 0 to 10 Second NE555: Computers & Accessories
Buy Generic 12V Delay Timer Switch Adjustable Module 0 to 10 Second NE555: Industrial Electrical - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
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0.49US $ 38% OFF|Dc 5v 12v Time Delay Relay Ne555 Time Relay Shield Timing Relay Timer Control Switch Car Relays Pulse Generation Duty Cycle - Relays - AliExpress
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0.5 ft. 16/3 Extension Cord HDC201 - The Home Depot
Frees up space on a power strip, surge protector or wall tap by making room for bulky AC adapters. Durable 6 in. power cord. Converts 1-outlet into 2-outlets impact-resistant casing ensures maximum durability
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