Froust

I was finally was able to make it work, firstly i used thermistor pins instead of endstops, the main thing is that S pin from the relay should be connected...

Hm, I don't have multi-meter so I'm not sure about sending a signal, also no, it doesn't shut down immediately, it takes about 5 seconds to turn off.

I will publish it here in case if someone needs it. I attached the wiring, the only difference is that I used thermistor pins instead of endstop.  The marlin...

@CristianoGorla wow thanks, I didn't know about the jumper, do you need to remove it after pushing the button?