Delayed off circuit with SPDT circuit
simulate this circuit &ndash; Schematic created using CircuitLab

Figure 1. Using a delay-on timer to switch off a load after a delay.

How it works:


Initial conditions: SW1 is open. The time delay module NC (normally closed contact) is closed and the load is powered.
SW1 (an SPST will do) is closed.
The timer module starts timing.
At the end of the preset time the relay energises and disconnects the load.
When SW1 is opened the relay immediately resets and the load is energised again.


This circuit will do what you require if you can tolerate the switch being left in the "on" position to switch the circuit off! (It's just a matter of labeling it backwards.)