My PC can take a minute or more to shutdown (more when patching) and mostly I want it instantly off. Unlike a laptop (on battery), I can’t just shut it down and leave it so I have to wait until the lights go out and then switch off at the mains. I know many people don’t do this but I do … I’ve checked and a PC tower system like mine uses 40W even when switched off i.e. like many modern devices they are never truly off.
So I am looking for a power switch that I can switch off immediately but will continue to provide power for, maybe, five minutes or maybe even auto senses the load and when it drops under a pre-specified level cut it completely.