Description
The SM323-ZG-GREY is the grey variant of our flagship SM323 V2 Zigbee dimmer – a screwless flat plate UK rotary dimmer with a knurled metal knob, fitted with the same proven SM323V2 PRO module behind the faceplate. Push to toggle, rotate to dim. Designed for no-neutral installations (optional neutral connection is also supported).
Native Zigbee 3.0 device that pairs directly with Home Assistant (Zigbee2MQTT / ZHA), SmartThings, Hubitat, Philips Hue Bridge, Aqara, and any other Zigbee 3.0 hub. Voice control via Alexa, Google Assistant and Apple HomeKit (through your hub’s HomeKit bridge). Every SM323-ZG module also functions as a Zigbee 3.0 mesh router, extending the range and resilience of your smart home network.
Key features
- Protocol: Zigbee 3.0 (works with any Zigbee coordinator)
- Dimmer type: Trailing edge (reverse phase)
- Input voltage: 230 VAC, 50/60 Hz
- Max LED load: 150 W (5 W minimum)
- Max incandescent / halogen load: 350 W
- Module dimensions: 51 × 26 × 24 mm (fits standard UK 35 mm-deep back boxes)
- Faceplate: screwless flat plate, grey finish
- Knob: knurled metal, grey finish (selectable)
- Wiring: Live only, or Live + Neutral if available. Screw terminals accept 1.0–1.5 mm² solid or stranded cable
- No bypass capacitor required for most dimmable LED loads
- Switch type: 2-way (retractive switch only)
- Hubs: Home Assistant (Z2M / ZHA), SmartThings, Hubitat, Philips Hue Bridge, Aqara, Tuya Zigbee
- Mesh routing: every module acts as a Zigbee 3.0 router
What’s in the box
- SM323V2 PRO Zigbee dimmer module (one per gang)
- Screwless flat plate, grey
- Knurled metal knob in your selected colour
- Mounting hardware
Setup and installation guides
- How to install a Zigbee dimmer in a UK home
- Samotech Zigbee dimmer – Home Assistant setup guide
- No-neutral Zigbee dimmer guide UK
- Zigbee dimmer not working – 10 fixes that actually help
- SM323 V2 vs V1 – what changed
- Best Zigbee dimmers UK 2026
Need just the bare PCB (no faceplate) for a retrofit? See the Zigbee Dimmer Module. Looking for other finishes? Browse the full Zigbee Dimmer Switch family in white, grey, black, brushed chrome and brushed antique brass.
Really happy with this! Accessible price-wise, and works really well. I particularly like that it works with retractive switches for 2-way setups!
Great product and I managed to connect to my Amazon Echo device via Zigbee with no issues.
Worked well so far. Had one out of 3 that did not work and am getting it replaced.
Seem to work well with Philips Hue. Slightly wider than normal dimmer modules so needed to make the a Click Deco dimmer faceplate holes wider with a Dremel