Zigbee 2-1 Switch (On/Off & Dimmer) | Project New Horizon (Blue Series)

Quick update regarding the outstanding questions:

  1. On/Off vs Dimmer functionality – is this done via firmware or hardware
  2. Group vs Individual ZigBee Binding

Regarding #1 – We’re still working on this with the manufacturer. We do have a preliminary response, but I’m not sure I fully understand, so I’m asking for clarification before explaining it here. There is a difference inside the switch on how the switch handles a dumb switch vs an aux switch, which leads me to believe there are different ways the switch handles loads. Similar to the dimmer switch, when a dumb switch is used, you hear a, “click” which cuts power completely to the circuit. This is why you cannot use a dumb switch in a non-neutral setting as no power, “leaks through” to power the switches internal circuitry.

My gut is telling me that this new switch is basically our dimmer switch, as it now makes sense how they were able to solve the non-neutral setup in on/off mode. However, what I want to explore is if we can utilize that other relay (used during the dumb switch mode) to have a, “hard on/off” vs “simulated on/off”.

EDIT: For full transparency, I’m adding the manufacturer’s response. Someone way smarter than me can possibly interpret:

“It’s a mos tube instead of the relays because it’s a 2-in-1, the relay inside will only be used under a dumb switch setting. On/off and dimming are using the same hardware (mos), when on/off there will only be 0 and 100, when it is set to off (0), the electrical conduct of the p-n junction in the mos tube will be cut off (but it is differ from the concept of a physical cut off of a relay).”

Regarding #2 – This is something being tested as we speak. Right now we haven’t gotten groups to work, but honestly, this wasn’t on our radar as we’re new to ZigBee and didn’t know this was a thing, so thank you for bringing it up! Individual binding is working great, however.


“Not quite accurate” back at ya :stuck_out_tongue:

Being a sine wave does not mean its not pulsing. Its still a wave that goes up and down and crosses 0 and reverses direction. It absolutely is pulsing 60 times a second. Being a sine wave doesn’t change that fact. Its going from 0-170v-0-170v which is a pulse and has a width of 1/60 a second. It doesn’t have to be a square wave to be PWM. Curved waves pulse too.

Granted, full sine wave AC is smoother than the chopped wave from triacs and mosfets. And I agree the chopped wave can cause some issues (mostly noise) with different types of load. But it doesn’t mean its not pulsing. All AC power is pulsing and a relay does not change that.

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Thanks for these quick responses, @Eric_Inovelli and team!

Quick follow up question re: #2 binding: Are you aware of any limit on the number of bulbs that the individual binding will work with on a single dimmer. e.g. can I bind 10 bulbs to one dimmer or is there a limit like the 5 bulb zwave association limit with the red series dimmers?

This would really only be important if the group binding ends up not working out. I’ve noticed that some dimmers seem to have hard bind limits (e.g. 7 devices for the Lutron Aurora dimmer), but others seem to allow many more (e.g. GE Zigbee in wall dimmer). Of course, I’m assuming these limitations are with the dimmer hardware/firmware itself and not my controller or controller software (Sonoff Zigbee 3.0 and zigbee2mqtt in my case), but I’m new to “advanced” zigbee as well so learning as I go. I think I have a max of 6 bulbs I’d want to bind to a single dimmer, but would be great to get confirmation if possible!

This is a very old comment that no one ever replied to, but could you potentially use a faceplate screw as a heat sink for the thermal probe? You’d need to somehow thermally isolate the probe and screw from the metal heat sink tabs (maybe a plastic ring between the screw and housing?), and thermally couple the faceplate screw to the probe (maybe mount it such that you can actually screw directly into the probe?), but that could be a pretty elegant and invisible solution.

I love having extra temperature sensors all over the house, so this would be awesome for me, and maybe even awesome enough to get me to upgrade my existing switches.

I’m contributing nothing to this conversation but…

Wow. It’s amazing the level of depth & transparency @Eric_Inovelli has provided in this thread. I had been holding out for a restock of the Reds to complete a number of outstading projects in my house (10+ switches needed), but no longer…I’m now in the long line for the Blue Switches.

I could have picked up any ol’ zwave switch instead of waiting for the Reds to come in stock. I’m really happy I didnt.

Project Update: Received some clarity around the relay question (I’ll explain below) and we’ve closed any new firmware requests so that we can submit for ZigBee Certification (or CSA, I’m really not sure what it is). New ideas will be captured and put into a firmware upgrade in the future and the only thing we’re working on for the production run now is squashing any remaining bugs.

Targeting early May for a release – hopefully pre-orders can open in April once we have an official production scheduled. I’m going to be conservative with pre-orders this time!

Relay Question/Comments
I want to first thank @contactcr for bringing this up and for the rest of you who piled on and asked for clarity. This is exactly what the community is for and I want to share that because of you all bringing this up, we were able to make a last minute change as there was a misunderstanding (language barrier – no one’s fault – if anything, mine for not being super clear).

TLDR: We were able to add the relay function (as the hardware already supported it in 3-Way (Dumb Switch) mode) so that there’s more of a, “hard on/off” for single-pole settings. We were unable to put it in 3-Way (Aux) mode because of the way the smart switch detects signals from the traveler (and the aux and dumb mode detection is different). So, while the normal MOS + relay scenario we implemented works great and we haven’t had any complaints around flickering or safety concerns in on/off mode, at least there will be an override if someone experiences this.

Long Version:
NOTE: I am not an engineer so if I screw some technical terms up, I apologize – I understand the concepts of what’s happening, but I will likely mess up some of the vernacular.

When we first briefed the team on our requirements, we said that we wanted this switch to work in both a neutral and non-neutral setting (like our Red Series Dimmer) but also, if they could figure out how to get it to work in on/off mode, that would be a bonus.

Looking back, I can now see where the language barrier came into play. We told them that our current Red Series Dimmer had two relays in it as when it was put in 3-Way (Dumb) mode, you could hear a, “click” just like you hear in the Red Series On/Off. Keep in mind, none of us are engineers and we rely heavily on the expertise of our manufacturers (for better or worse – I know there are pro/cons for hiring internal vs outsourcing – not here to debate that lol). So, we figured they could just take our Dimmer switch and use the one relay (MOS) for the dimming functions and the other relay (the one that clicks) for the On/Off function.

When we received the switch, I remember thinking how there wasn’t a clicking for the on/off, but didn’t think much of it because the on/off worked great and even worked on my extremely cheap LED can lights (I live in a rental and the builder is notoriously cheap).

It wasn’t until @contactcr brought it up that I remembered not hearing the audible, “click” and I went into full panic mode lol.

Luckily, when testing the 3-Way (Dumb), I heard the, “click” and at least knew the relay was in there.


What we ultimately decided was that the current implementation of the switch will work just fine and has worked fine across 20+ beta testers and in internal testing (both here and at the manufacturer). But, in the rare case someone wanted the, “click” relay (or traditional switch relay), there should be a way to access it outside of 3-Way (Dumb) mode.

We were able to configure the firmware to give single-pole the ability to have the traditional relay. Unfortunately, this will not work in an auxiliary setting as that would require a major change to how things were designed (the way the smart switch detects the travelers in an aux vs dumb switch setting would ultimately confuse the switch).

So, we have the following options now:

  • Single Pole - On/Off (MOS) - Works in Neutral or Non-neutral
  • Single Pole - On/Off (MOS + Relay) - Only works in Neutral
  • Single Pole - Dimmer (MOS) - Works in Neutral or Non-neutral
  • Single Pole - Dimmer (MOS + Relay) - Works in Neutral only
  • 3-Way (Dumb) - On/Off (MOS + Relay) - Works in Neutral only
  • 3-Way (Dumb) - Dimmer (MOS + Relay) - Works in Neutral only
  • 3-Way (Aux) - On/Off (MOS) - Works in Neutral or Non-neutral
  • 3-Way (Aux) - Dimmer (MOS) - Works in Neutral or Non-neutral

Hope this helps clarify things and again, thank you so much for bringing this up @contactcr and for the rest of you guys for building on it. As mentioned, this is exactly why we have the community and the reason why I always say 1,000 project managers are always better than 1!


@Eric_Inovelli thanks for the detailed reply (and just in time it appears). Sounds like a really versatile switch in all respects!

Thanks, @Eric_Inovelli. My guess is that you will get Zigbee certification from the CSA. :slight_smile:

FYI for all, Matter has received another couple of months delay. Although pertinent to the Blue Switches future thread/matter support from Inovelli, 0.9 of the matter spec should become available to you for testing in June, which would allow several months of testing before it is a full go this fall.

Connectivity Standards Alliance Matter Update March 17, 2022

Matter smart home standard delayed until fall 2022


Just saw the PR on the ZHA_Quirks GH repo for the switch. Pretty cool to see a company out in front with that, all the manufacturer attributes right there too nice job!


Can anybody explain in layman’s terms the significance of one relay vs two. Been following this thread for a long time but it got super technical the last few post. :rofl:

One is a relay in the traditional sense (mechanical, ie why you hear a click). The other is a MOSFET, used in a similar fashion as in a SSR (solid state relay). The mechanical relays are better for highly inductive loads like fans/motors, whereas the MOSFET allows for on/off for mostly resistive loads and also allows for dimming through either leading or trailing edge control of the AC waveform.


Thanks for the explanation. So basically this switch is the best of both worlds. Can’t wait til it’s released. I need like a 100 of them!


I am going to have to keep the context of the sentence in mind. It wasn’t till you said this that I realized @Eric_Inovelli wasn’t talking about the Canadian Standards Association.

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Just to chime in: controlling a group vs controlling individual lights is pretty critical for a superior user experience. I have groups of 4 lights in various rooms, and when turning on, off, or changing a group vs 4 individual lights you’ll definitely see with almost no effort the sync of the group vs individual lights. It can be pretty blatant, even if no other Zigbee commands are being fired - so I hope group binding will be possible.

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100 percent agree. This is a huge selling point for our switch and we need to nail it.

Are these available for pre order yet?


Lol not yet, I want to make sure we have a set date of production (or at least a confirmed spot on the line with an approximate date) as well as finalized firmware before posting anything.

It still makes me nervous that UL hasn’t said anything, but I’m hoping no news is good news. The last thing I want to have happen is they come back with some hardware change requirement and pre-orders are pushed back.

Sorry, I know everyone is excited - I promise I’ll get them up as soon as I can. I’m targeting early April!


Thanks for the heads up. I purchased a bunch of inovelli light strips in anticipation of using them with these new switches for under cabinet kitchen lighting, as well as other automation around the house. Can we expect an aux switch to follow shortly? I’d like to clean up all these 3 way and 4 way switches. It’s driving me insane!

Ha, yeah completely understand. Yes, I keep forgetting to talk about the aux switch (thanks for the reminder!)

They should be launching at the same time :slight_smile:


You just made my evening.

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