I wrote a Blueprint for it since there was nothing like it already posted
i4 input voltage does not matter for the dry contacts themselves (like with the Legrand LVSW devices). The voltage only powers the Shelly device. I have both the i4 Gen3 (110v AC) and i4 DC (24vdc), they are identical in function.
“Dry Contacts” means there is no voltage flowing through it. The power going to the LVSW does not ever flow through the buttons.