Shelly
Shelly Dimmer Gen3
- Native integration
- Local control
- Wi-Fi
- Matter
- Bluetooth
Prices verified September 2026
See more relays & dimmer modules picks on our Amazon storefront →Our verdict
The go-to Wi-Fi dimmer for UK no-neutral lighting circuits — it works without a neutral wire, though you'll need the Shelly bypass for LED loads under 20W. Trailing-edge only, with power metering, fully local in HA, and slim enough at 16.5mm deep to fit almost any UK back box — unlike the Fibaro Dimmer 2, which needs a 60mm-deep pattress. At £28.99 it's roughly half the Fibaro's £53-55, trading Z-Wave's mesh range and physical scene-controller input for Wi-Fi's simpler setup and Matter support. The 200W ceiling comfortably covers a multi-bulb pendant or downlight circuit, and since dimming happens on-device, HA brightness changes land instantly with no cloud round-trip.
What can Home Assistant control on the Shelly Dimmer Gen3?
| Control | Type | What it does |
|---|---|---|
| Gamma correction | Config | Adjusts the dimming control signal to correct perceived brightness non-linearity; raise it if the low end of the HA brightness slider jumps too fast. |
| Warm-up impulse | Config | Brief power boost applied when commanded brightness is below 10%, needed to reliably start LED drivers that won't wake at very low duty cycle; set via the device web UI, not an HA entity. |
| Input mode | Select | Governs how the attached physical switch behaves — toggle-and-hold dimming, paired up/down buttons, or fully detached so the wired switch can drive its own HA automation independent of the dimmer's own state. |
| Minimum brightness on toggle | Number (%) | Floor brightness applied whenever a toggle-on would otherwise land below it, preventing ultra-low dim levels some LED drivers can't sustain without flicker. |
| Power/voltage/current limits | Number | Configurable trip thresholds; exceeding them cuts output and raises an error surfaceable in HA as a diagnostic sensor for overload detection. |
Unlike the Fibaro Dimmer 2, this Shelly is fixed to trailing-edge output only — there's no leading/trailing mode select, so pair it with trailing-edge-rated LED drivers rather than older leading-edge transformers. Calibration runs automatically on first toggle for a fresh device, or can be forced with a simultaneous hold of both physical buttons, and re-runs itself whenever it senses a load change. A configurable warm-up impulse plus a gamma curve target flicker or no-start behaviour on cheap LED drivers below 10% brightness, worth tuning before writing a driver off as incompatible. Because reported power scales with commanded brightness on this model, an automation can watch for wattage that stays flat despite brightness changes — a cheap signal a driver has failed or isn't actually dimming — and fire a maintenance notification instead of waiting for someone to notice the room looks wrong.
Specs
| dimming | trailing edge only |
|---|---|
| channels | 1 |
| max load w | 200 |
| dimensions mm | 38 x 42.5 x 16.5 (H x W x L) |
| supply voltage | 220-240V 50Hz |
| standby power w | 1.5 |
| power monitoring | true |
| no neutral capable | true |
| bypass required under w | 20 |
| max load dimmable led w | 150 |
| operating temperature c | -20 to 40 |
How does the Shelly Dimmer Gen3 compare?
| Product | From | Protocol | Local control | Integration |
|---|---|---|---|---|
| Shelly Dimmer Gen3 (this product) | £28.99 | Wi-Fi, Bluetooth, Matter | Yes | Native |
| Aqara Dual Relay Module T2 | £29.74 | Zigbee | Yes | Zigbee2MQTT / ZHA |
| Aqara Single Switch Module T1 (No Neutral) | £26.99 | Zigbee | Yes | Zigbee2MQTT / ZHA |
| Candeo Zigbee Dimmer Module (C-ZB-DM204) | £39.99 | Zigbee | Yes | Zigbee2MQTT / ZHA |
Frequently asked questions
- Does the Shelly Dimmer Gen3 work with Home Assistant locally?
- Yes. The Shelly Dimmer Gen3 is controlled locally in Home Assistant through a built-in Home Assistant core integration (shelly), so it keeps working if your internet connection or the Shelly cloud goes down. Control and state updates stay on your own network.
- Which protocol does the Shelly Dimmer Gen3 use, and do I need a hub?
- The Shelly Dimmer Gen3 uses Wi-Fi and Bluetooth and Matter. To pair it with Home Assistant you need no hub — it joins your Wi-Fi network directly; or a Bluetooth adapter on your Home Assistant host or an ESPHome Bluetooth proxy; or a Thread border router if it is Matter-over-Thread, or just your Wi-Fi network if it is Matter-over-Wi-Fi. Shelly's own hub is not required when you integrate through a built-in Home Assistant core integration (shelly).
- How much does the Shelly Dimmer Gen3 cost in the UK?
- The lowest price we have listed for the Shelly Dimmer Gen3 is £28.99 at Shelly Store UK, with other UK retailers at up to £28.99. Prices were last checked in September 2026 and change often, so confirm on the retailer's page before buying.