I apologize for posting in English but you can use google translate, as I do for reading German. I am very grateful for the useful information in this area of the forum (specifically using i4 on low voltage)
I wanted to use low voltage momentary switches for input to Shelly Dimmer 2. Panasonic AQY282 (one form A NO SPST) and AQW282 (two form A NO SPST) photoMOS solid state relays require only 1.2 volts and 2 milliamps to operate (they can take up to 5 volts) and 1 microampere when off -- so could use battery but I am using new construction so will supply DC. They do not require power from the switched side and have 5000vac isolation between the input side and the switch side and can switch 60 volts. At 120v the measured voltage between SW1 or SW2 and L is under 7 volts both AC and DC so these are fine. I tested it on a dimmer 2 and it works as you would expect.
They can be added to a high voltage box containing the Shelly with adequate separation and insulation and then multiple low voltage momentary switches in parallel (via low voltage wiring from outside the box) can control each shelly input. These cost under $1.75 per channel (for example from Digikey or Mouser). Available in either DIP through hole or SMT packages.
