I used the concept of RamjetX, but I created my own version. The nipples are updated, created a key to open the case with a flat screw driver and I created the OpenScad file in case someone want to adapt it to his need. (The case code is quite ok, but the lid code is quite crap: good luck if you need to reuse it)

Info: I would like to add something: the Solid State Relay is not suitable for DC load (don't stop once trigged) and 12V load (doesn't wanted to start in my setup)! It is mostly adapted to Grid AC load.