Need a 0.5 sec UPS (prolonging agony for resurrection)
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Understood …
Have a think about replacing the SSR with an ip relay e.g. Shelly 1. You can turn it on / off from a browser and/or a momentary switch. You would not need to use PS_ON to latch it. It would also operate independently of your emergency supply.
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@stuartofmt I slowly tend to that Shelly thing as it looks like a manageable and straightforward solution, until I am forced to do something more fancy. Thanks.