Mini-format Zigbee retrofit modules designed to fit behind an existing UK or EU wall switch, or inside a ceiling rose. Convert any standard wired light circuit into a smart Zigbee circuit – without changing the faceplate, without rewiring, and without losing the existing physical switch.
Native Zigbee 3.0 devices. Pair with Home Assistant (Zigbee2MQTT or ZHA), SmartThings, Hubitat, Philips Hue Bridge, Aqara Hub M2, or any other Zigbee 3.0 hub. The modules are recognised as generic Zigbee switches or dimmers and exposed as standard entities for full automation and voice control.
Why a retrofit module instead of a smart wall switch
Two reasons to choose a module over a full smart wall switch:
- Keep your existing faceplates. If you have decorative or brass faceplates, or just a coordinated set throughout the house, retrofitting a module behind them preserves the look. The module sits invisibly behind whatever switch you’re already using.
- Multi-gang flexibility. One module per gang means you can mix and match – have one gang dimming, another on/off switching, all controlled independently from a single faceplate.
Choose a full smart wall switch (see our Zigbee Light Switch) instead if you don’t have a particular faceplate to preserve and want the simpler install.
Variations available
- 1, 2, and 3 gang switching modules – on/off control for one, two, or three independent lighting circuits from a single back box.
- Dimmer modules – trailing-edge dimmer for dimmable LED and incandescent loads, 5-200W.
- No-neutral and conventional wiring – both supported on most variants. Pick the right one for your UK back-box wiring.
For the inline dimmer specifically, see also our SM309-S Zigbee Dimmer Module which has its own dedicated product page with full specifications.
Installation requirements
- UK 37mm-deep back box minimum recommended (25mm boxes are too shallow for module + wiring tail)
- Existing retractive or standard wall switch wired to the module’s signal input (retractive recommended for dimmers)
- Live (and optionally neutral) supply
- Switched live out to the light fixture
Safety: Always isolate the circuit at the consumer unit before working on mains wiring. If you are not confident with mains electrical work, use a qualified electrician. UK Part P regulations may apply – check requirements for your specific install.
Pairing
- Install the module and power the circuit.
- Put your Zigbee hub into pairing mode.
- Press and hold the switch connected to the module for 5 seconds (or the module’s button if directly accessible).
- The module joins the hub within a few seconds.
- Rename, assign a room, and use it like any other Zigbee on/off switch or dimmer.
Work exactly as advertised, easy to set up, very pleased – will be buying more.
The model I ordered was not available so I was send a higher spec version which is working perfectly.