I’m really not sure as I’m not an expert on the electronics of the relay nor its tolerances. If you do choose to go this way, I’d try the 10v option first and that may work if the relay is located relatively close to the Z4000 to minimize voltage drop due to wire size and distance. Again, it may not be enough to both activate and hold the relay closed. If you use the 14v terminals, I’m thinking that you will shorten the life of the relay, possibility to a very short life (that is a quick burn out). Again, these are just my observations and frankly, they are guesses on my part. I use the wall wart to focus the power of the Z4000 on running the trains. I plug the wall wart into the same power strip that I use to power the transformers so all turns on and off with the main supply. It’s a cleaner application for my wiring setup.
Maybe someone more versed in the electronics can weigh in with a more definitive view?
