I had a circuit that I wanted to turn on when I connected a plug(9 pin) 3 pins consumed by POT and 2 For a momentary switch. 4 pins remain available.
Thoughts was to use 2 pin connected together to act similar to a switch. When connected they would connect power to AC/DC converter, when plug disconnected no power to ac/dc. Mains power can either be 110 or 220 VAC.
Question is do both 220 Load legs need to be disconnected or only 1.