Zigbee dimmer module
Zigbee dimmer module
SM309-S Zigbee dimmer module in Home Assistant
SM309-S Zigbee dimmer module in Home Assistant
SM309-S Zigbee dimmer module in ZHA
SM309-S Zigbee dimmer module in SmartThings

Zigbee Dimmer Module UK – SM309-S Inline, No Neutral (Home Assistant)

(97 customer reviews)

£36.99 – £41.24

Zigbee inline dimmer module (SM309-S) – fits behind any UK wall switch, supports no-neutral and conventional wiring, 400W max load. Native Zigbee 3.0 device that pairs with Home Assistant (Zigbee2MQTT / ZHA), Philips Hue Bridge, SmartThings, Hubitat, HomeKit and any Zigbee 3.0 hub. Trailing-edge dimming, retractive switch input, 100-240V AC compatible.

  • Zigbee 3.0 inline dimmer module – fits behind any existing UK wall switch plate
  • No neutral required – L and N terminals bridged for two-wire UK lighting circuits (also works with conventional neutral wiring)
  • 400 W max load, trailing-edge dimming, 100–240 V AC compatible
  • Pairs with Home Assistant (Z2M, ZHA), Hue Bridge, SmartThings, Hubitat and any Zigbee 3.0 hub
  • Retractive push-switch input for traditional wall control alongside Zigbee
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Description

Next-Gen Protocol: Boasting the advanced ZigBee 3.0 protocol, this dimmer offers broad compatibility and good performance.

Universal Compatibility: Compatible with such as Philips Hue, Homekit, Echo Plus, Hubitat, Homeassistant (ZHA, deConz, Conbee, Raspbee), and a plethora of universal ZigBee gateways.

Voltage Flexibility: With a broad input and output voltage range of 100-240VAC, it caters to diverse power needs.

Versatile Load Support: Efficiently handle resistive, capacitive, or inductive loads. A retractive switch is essential for optimal performance.

High Capacity: Offering a single channel output, it supports up to a whopping 400W.

Reliable Terminals: Ensure safety and a sturdy connection with the screw terminals for both input and output.

Factory-Defined Settings: Benefit from the trailing-edge version, preset at the factory, ensuring peak performance.

Granular Control: Dictate the ON/OFF state and modulate the luminosity of the connected lighting.

Simplified Pairing: As a ZigBee router device, it supports Touchlink commissioning, enabling direct pairing with compatible Zigbee remotes sans a coordinator.

Self-Reliant Networking: Form a Zigbee network autonomously without a coordinator, and automatically join other devices.

Optimized Binding: It not only supports the find-and-bind mode for ZigBee remotes but also champions Zigbee’s green power, accommodating up to 20 green power remotes.

Compact & Functional: Its mini dimensions allow for snug fitting within a standard 86*86mm wall box.

Energy Monitoring: Stay informed with active power and energy metering capabilities.

Wiring Versatility: Flexibility to wire with or without a neutral wire. Can be used in 2-way wiring with retractive/momentary/push or standard on/off toggle switches.

Smart Illumination: Set minimum dimming levels, startup brightness, and use the built-in light source detection algorithm.

Frequency & Safety: Operates on a 2.4GHz radio frequency and designed with a waterproof grade of IP20, ensuring safety and stability.

Supported Zigbee clusters:

Input Zigbee clusters:
• 0x0000: Basic
• 0x0003: Identify
• 0x0004: Groups
• 0x0005: Scenes
• 0x0006: On/off
• 0x0b04: Electrical Measurement
• 0x0b05: Diagnostics
• 0x0b08: Level Control
• 0x0702: Simple Metering 

Customer reviews on Amazon UK
4.6
★★★★★★★★★★
Based on 16 customer reviews on Amazon UK

5 star

72%

4 star

19%

3 star

9%

2 star

0%

1 star

0%

Aggregate review figures sourced from the Amazon UK product listing. We do not republish individual review text or photographs.

Additional information

Weight 35 g
Dimensions 42 × 38 × 16 mm
Type

Typical, Preconfigured
Brand

Samotech

Frequently Asked Questions

Does the SM309-S need a neutral wire?

No, the SM309-S is a no-neutral Zigbee dimmer module — it installs with just live and switch wires, making it ideal for older UK homes without neutrals at the switch position.

Where does the SM309-S install?

The SM309-S can be installed inside the back box behind your existing UK light switch or in the ceiling rose behind or inside your light fittings. At roughly 45mm × 45mm × 18mm it fits a standard 35mm UK back box alongside the original switch.

What load can the SM309-S handle?

The SM309-S handles 3W to 200W of dimmable LED or 250W halogen or incandescent loads. For loads under 5W with no neutral wiring, the SM107 bypass capacitor may be required for flicker-free dimming.

Does the SM309-S work with retractive switches?

Yes, the SM309-S is designed for use with retractive (momentary push) switches for full Zigbee dimming control by pressing and holding the light switch retractive button. Standard rocker switches are also supported allowing on/off physical lights control (no dimming).

Which smart home platforms support the SM309-S?

The SM309-S uses native Zigbee 3.0 protocol — it pairs with Home Assistant (ZHA and Zigbee2MQTT), SmartThings, Hubitat, and any Zigbee 3.0 coordinator. No proprietary hub or cloud account is required.

Is the SM309 still the current model?

No — the SM309 has been superseded by the SM309-S, which is the current smaller size module in the Samotech in-line Zigbee dimmer range.

How do I reset or pair an existing SM309-S?

To reset the SM309-S, press the reset button five times. To initiate Touchlink pairing without a reset, press the button four times. Then add it through your Zigbee gateway’s standard "add new device" flow. If pairing fails, ensure the dimmer is not already in your hub’s device list — remove it first if so.

Can my SM309-S be linked to multiple remotes?

Yes. The SM309-S can be linked to and controlled by up to 30 Zigbee remotes that support Zigbee Light Link via Touchlink. It also supports Zigbee Green Power and can be bound with up to 20 Green Power remotes directly, without a hub or gateway.

Manual

SAMOTECH Zigbee Dimmer SM309-S V2 Manual

Specifications

Zigbee Dimmer Module

Wiring Diagram

Bulbs Compatibility Matrix

BULB / LOAD TYPE COMPATIBILITY RISK LEVEL TYPICAL SYMPTOMS RECOMMENDATION
SAMOTECH Dimmable GU10 SAMOTECH GU10 Compatible None None Recommended
Incandescent / Halogen Incandescent Halogen Compatible None None Recommended
Dimmable LED (Quality brands) Quality LED bulbs Compatible None None Recommended
Dimmable LED (Cheap / unknown) Cheap LED bulbs Conditional Very Low Minor flicker. May not turn off fully. Test first. Use a bypass if required.
Low load LEDs (<15W) Low load LED bulbs Conditional Very Low Minor flicker. May not turn off fully. Use a bypass
LED strips (220V dimmable driver) LED strip dimmable Conditional Medium Minor flicker Test first
Integrated LED fittings (separate LED driver, colour modes) Integrated LED fitting Conditional Medium Flashing or intermittent operation due to internal LED driver control Test first
Non-dimmable LED Non dimmable LED Not compatible High Flicker, overheating Do not use with dimmers
Smart bulbs Smart bulb Not compatible High Disconnects, rebooting Do not use with dimmers
LED strips (220V non-dimmable driver) Non dimmable LED strip Not compatible High Flicker, overheating Do not use with dimmers
Fluorescent / CFL CFL bulb Not compatible High Failure to start Do not use with dimmers

97 reviews for Zigbee Dimmer Module UK – SM309-S Inline, No Neutral (Home Assistant)

4.9
Based on 97 reviews
5 star
88
88%
4 star
11
11%
3 star
0%
2 star
0%
1 star
0%

Customer Images

Image #1 from Anonymous
Image #1 from Damian
Image #2 from Damian
Image #3 from Damian
Image #1 from Anonymous

Anonymous

Great pieces of kit. So far all stable.

(1) (0)
Image #1 from Damian

Damian

Works well with SmartThings hub using generic device handler (ZigBee Dimmer). Works well with Ikea dimmable LEDs (various). Very low minimum light level may be achieved. No blinking of LEDs at all. 6 of them fitted in all my house ceiling lights behind momentary switches on the walls, but had to replace shallow boxes for deep 47mm Dry Lining Boxes to accommodate all extra wires and Wago connectors. Automation works well with Xiaomi-Aqara motion sensors. Product I was looking for, for almost a year, but price could be smaller. Recommended!

(2) (0)
Image #2 from Damian

Damian

Works well with SmartThings hub using generic device handler (ZigBee Dimmer). Works well with Ikea dimmable LEDs (various). Very low minimum light level may be achieved. No blinking of LEDs at all. 6 of them fitted in all my house ceiling lights behind momentary switches on the walls, but had to replace shallow boxes for deep 47mm Dry Lining Boxes to accommodate all extra wires and Wago connectors. Automation works well with Xiaomi-Aqara motion sensors. Product I was looking for, for almost a year, but price could be smaller. Recommended!

(2) (0)
Image #3 from Damian

Damian

Works well with SmartThings hub using generic device handler (ZigBee Dimmer). Works well with Ikea dimmable LEDs (various). Very low minimum light level may be achieved. No blinking of LEDs at all. 6 of them fitted in all my house ceiling lights behind momentary switches on the walls, but had to replace shallow boxes for deep 47mm Dry Lining Boxes to accommodate all extra wires and Wago connectors. Automation works well with Xiaomi-Aqara motion sensors. Product I was looking for, for almost a year, but price could be smaller. Recommended!

(2) (0)
Image #1 from Anonymous
Image #1 from Damian
Image #2 from Damian
Image #3 from Damian
1-10 of 97 reviews
  1. Anonymous
    Verified owner
    (0) (0)
  2. Nicolas Martinez
    Verified owner

    Best smart dimmer!

    (0) (0)
  3. Lee
    Verified owner

    Great module. Used with a 2-way on/off toggle light switch, no neutral setup. Linked to remote panel to control dimming using ZigBee 3.0. Works perfectly also with a 1gang/1way switch.

    (0) (0)
  4. A U.
    Verified owner

    The perfect ZigBee dimmer module

    (0) (0)
  5. Andrew
    Verified owner

    What’s not to like, smaller version of an already great module. Win win!

    (0) (0)
  6. Anthony
    Verified owner
    (0) (0)
  7. Marc Labuhn
    Verified owner

    Very easy to set up, would be nice if it could instantly power on lights to full brightness instead of dimming up, but otherwise no issues.

    (0) (0)
  8. Richard Harnwell
    Verified owner

    Very happy with this.

    (0) (0)
  9. Alex
    Verified owner

    Works straight off, instructions are thorough and once you workout the setup needed it’s a breeze to wire.

    (0) (0)
  10. Lee K.
    Verified owner

    I have quite a few of these now and they are brilliant. Would highly recommend for any smart home.

    (0) (0)
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