I want to install a Shelly 1, behind a switch that controls a plug.
There is one switch, and a double switch, so I can use all the wires available there.
I want to automate the left one of the duo.
Three wires connected to the switch usually suggests two-way lighting; I’m guessing these switches are for a staircase or long hallway?
If there’s a neutral in a light switch it will usually either be loose (but insulated) or connected to another neutral in a separate terminal block/connector. It won’t be connected to a switch terminal.
Anyway, I know you already marked it as solved, but perhaps this will help someone reading looking for a solution.