Hi,
i would like to ask you. I have 3 way switch in on room and i would like to control it via Home Assistant. I have a lot of smart switch with Shelly integrated info HA and everthink is ok, but i dont know how i can connect 3way switch.
There is photo of all 3 switchs -
Do you know how i can connect this 3-way switch via Shelly ?
Thank you so much
Not exactly sure what your picture shows, but if by three way switch you mean two switches in line so you can turn light/etc on/off from two locations then you simply put the shelly at the end point of the circuit. So power enters at first switch, is wired overs to the second switch and then finally hits the end device. Shelly goes in front of the end device.
Yes, it’s doable for your 3 way switch
If you need to avoid adding new cable for the installation, you’ll need to replace your existing switch with momentary type (like those doorbell switch)
I want to do something similar but I can’t figure it out. I have this setup.
I want to replace switch 1 with a Shelly 2PM. Can this be done?
The normal way of doing this would be to put the Shelly between switch 2 and the light. So you either put it in the junction box behind switch 2 or in the junction box where the light is connected. For me the placement is driven by what other wires are available at these two locations. You need to have a neutral wire and power available to power the shelly. The load out of switch 2 would go into the S1 port of the shelly.
Three way switches can be tricky. Not all hardware can be used in this situation. Not all three way switches are wired the same either. If you are fortunate to have dead ended three ways it makes it simpler to do but it inevitably comes down to the particular switch you are trying to implement.
I used an Aeotec which has numerous options for three way switches. In my specific case I used the three way switch circuit to operate as strictly dry contact and do the actual load switching with the Aeotec.
I finally had time to work on this and got it working. Thanks for your advice!
Would you care to share how you got things working here? I have the same wiring scenario and would like to put a shelly 1 mini Gen 3 in there somewhere
I don’t mind sharing BUT…I am not an electrician and I am not providing advice. This is simply to show you what I did.
AH, thank you for sharing that. So it looks like you completely eliminated one of the three way switches and just replaced it with the Shelly.
I actually, just today, got this working in a three way switch circuit and was able to leave both switches in. Works like a charm. If I get some time I’ll try to draw up a proper wiring diagram.
Part of my problem is that the box that has the power in, is too packed with other wires from a second switch (part of a different three way circuit). So I had to use the switch at the other end, which meant I had to feed separate power into the box, to power the shelly. I’m not sure the effort to pay off ratio was worth it LOL.
I’d really appreciate that diagram if you do get a chance to draw it out! I’ve got the same situation re: two-gang switch with two three-way circuits (which confusingly are called two-way here in the UK).
To complicate things, I’d like to make both circuits smart, and I’m not sure yet of the configuration of the circuits in terms of where the switched live connects, so I’ll need to do some more investigation
For anyone who stumbles on this:
Essentially from the video by Dr Zzs, there are 3 main scenarios of how one could wire up a 3-way switch. In the US, scenario 3 is the most common. You can read more about the background HERE.
There are a few ways to handle this, the approach I took, which was the cheapest and simplest included buying only 1 Shelly 2PM. I then used this post to guide me; worked like a charm and does NOT have the app drawback shown in scenario 4 in the video by Dr Zzs.
