ZEN51 Relay - Low Voltage AC (20 VAC)

Just want to double check that my thought process is correct. I have a video door bell that I’d like to be able to reset and even be able to turn off. It’s the wired kind, so it’s powered by ~20 VAC. Looking at the instructions, I believe I can use a ZEN51 relay to accomplish this?

L/N obviously to 120V., S needs to be to Line as well.
The IN and OUT, would be the “break” in my 20 VAC that I’m looking for.

I believe that would work, but curious why not turn off the 120v going into your doorbell transformer instead? That transformer is likely on an electrical box already so you may have room for the zen51 near the transformer instead. You would also have easy access to the 120v needed for the zen51 itself. Just a thought.

1 Like

That’s a thought, however that’s all up in the attic. I have really easy access to the low voltage line right by the door and can place the relay in the box for that all the switches for the lights are in. The secondary option is to place the relay near the “controller” in chime box that makes the camera ring the chimes. All of which keep me out of the attic, and the relay much closer to the hub.

1 Like

Got it. Also I’m guessing the relay would not do well in the heat of the attic anyway. I totally get trying to stay out of there. I just spent the last 2 days in my crawlspace running wire. I never want to do that again. lol.

“L/N obviously to 120V., S needs to be to Line as well.
The IN and OUT, would be the “break” in my 20 VAC that I’m looking for.”

The S wire should be capped - not used. The rest of the wiring is correct!

1 Like

I misread this part from the FAQ:

The yellow wire is the switch input pigtail, which would connect to the switch for manual on/off control. Note that the input requires 120V for this device.

So the “switch” wire doesn’t require 120 volts, that’s just a wire used if you want to manually control the relay (IE not by Z-wave). I was confused on why it was needed when I first “misread” it.

If you’re wiring the ZEN51 for a standard lighting application, you would connect the yellow S pigtail from the ZEN51 to one screw on the mechanical switch, and the 120V hot wire to the other screw on the switch. This setup requires 120V to operate the switch properly.

However, in your case, I understand that you’re not using a physical switch. In that case, the S wire should be capped and not used.