Shelly
Dimmer Gen3
An in-wall dimmer that hides behind your existing switch and brings smooth dimming to the circuit, with or without a neutral wire.
$49.95 inc GST In stock at supplier · dispatches in 2 business days
Generation
Model guide
Which generation should I pick?
A generation is the brand's own version label. Newer usually means more ways to connect rather than a different device: Shelly's Gen4 adds Zigbee and Matter on top of the Wi-Fi and Bluetooth that Gen3 already had.
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Gen3
Wi-Fi + BluetoothShelly's third-generation devices. Wi-Fi and Bluetooth, with a faster processor and more automation capacity than the Plus range they replaced.
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Gen4
Adds Zigbee + MatterShelly's fourth-generation devices. Adds Zigbee alongside Wi-Fi and Bluetooth, and works with Matter, so it pairs with Apple Home as well as the others.
1
Free shipping over $150 Ordered in from our supplier. Allow about 2 business days before it dispatches.
30-day returns Unopened items in their original packaging
Everything you need to know
The sections below cover what this dimmer can do, the jobs people put it on, the full specifications, and how warranty and returns work. If something's still unanswered, the questions at the bottom cover the common ones.
Product features
Your wall switches keep working
A Shelly relay sits behind the switch plate, in the wall box with the wiring you already have. The switch stays connected and keeps doing its job, and the relay adds app control, schedules and automations alongside it. Nobody in the house has to learn anything new, and if your internet drops out, the switch on the wall still works.
Fits behind an existing switch or powerpoint
Works with toggle and momentary switches
No new switch hardware to buy
Brightness, fades and schedules
Set the brightness from the app, the wall switch or a voice assistant, and let schedules do the rest: they set brightness and fade duration as well as the hour, so lights can drift down over minutes rather than snapping between off and full.
Works with dimmable LEDs and dimming drivers
Schedules set brightness and fade duration
Control from the app, the switch or a voice assistant
Trailing-edge dimming, with or without a neutral
It dims as a trailing-edge dimmer and installs with or without a neutral wire, so it suits Australian light switches that have no neutral in the switch box. In a no-neutral install with a load under 20 W, add the Shelly Bypass for Dimmer; it also cures the faint glow some LEDs show when switched off.
Trailing-edge dimming suited to modern LEDs
No neutral needed at the switch
Shelly Bypass covers no-neutral loads under 20 W
Automations that don't need the internet
Schedules, timers and scenes run on the relay itself, not on a server overseas. Set lights for sunset, a towel rail for weekday mornings, or a fan to run down after the bathroom light goes off, and it all keeps working through an internet outage. There's no subscription, and the embedded web interface gives you full control from a browser on your own network.
Schedules and scripts run on the device
No cloud account required for local control
Keeps working when the internet doesn't
How Shelly works
A Shelly is a small module that makes wiring you already have controllable. It joins your Wi-Fi directly, holds its schedules and scenes on the device itself, and keeps running them if your internet drops. Nothing you set up depends on Shelly's servers being reachable.
The device
The brain is the device
Shelly does the thinking locally, not in a data centre. Schedules, scenes and logic are stored on the unit and run there, so the lights still come on at dusk when the internet is out.
The network
No hub, no bridge
There is nothing to buy before the first one works. Where a Philips Hue setup is built around a Bridge that every light talks through, a Shelly joins your router directly and answers your phone from there.
The control
The app is optional
Every Shelly serves its own web interface, so you can set it up and run it from a browser on your own network, with no account. The Shelly Smart Control app and Shelly Cloud are free and add remote access and voice control, but nothing needs them.
The generations
What Gen1 to Gen4 means
Shelly has run through four hardware generations, and the same product name can exist in more than one of them. Later generations are faster and carry more radios than the ones before, which is why the generation is part of the name. The specifications on each page tell you which one you are looking at.
Getting started
1
It goes behind what you already have Start here
Shelly retrofits. The module fits behind the switch, socket or appliance that is already there, so your switch plates and fittings stay as they are and the original switch keeps working for anyone who just wants to flick it. Anything wired into a mains circuit is a job for a licensed electrician.
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Open by design Then run it your way
Shelly publishes its local API and does not put it behind a developer account. Devices answer HTTP and MQTT on your own network and can run small scripts on themselves. That is why Shelly is the default choice for people building on Home Assistant, which ships an official Shelly integration.
Start with one and add more whenever you like. There is no hub to outgrow, and each Shelly works on its own whether you ever add another or not.
Works with
Also works with
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Pairs with Amazon Alexa
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Pairs with Google Home
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Pairs with Home Assistant
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Pairs with SmartThings
Connects over
On your Wi-Fi
Joins your home network; control from the app, no hub or bridge needed.
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Wi-Fi
Set up over Bluetooth
Used once, to get it onto your Wi-Fi.
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Bluetooth
Works offline
Runs on your home network. Only remote access needs the internet.
Specifications & Installation
Setup · 1:54
How to install it
Shelly's own step-by-step install, from isolating the power to wiring L, N, O and the switch inputs.
Watch setup videoNo specifications match.
Build
- Type
- Module
- Gangs
- 1
- Housing material
- Plastic
- Power
- Hardwired
- Supply voltage
- 220–240 V
- Standby power
- 1.5 W
- Generation
- Gen3 Also available: Gen4
- Dimming method
- Trailing edge
- Max load
- 200 W
- Works with loads
- LEDHalogenIncandescent
- Neutral required
- No
- Neutral not needed
- Yes
- Min. load without neutral and without a Bypass
- 20 W
- Dimming type
- Trailing edge
- External protection
- 16 A, tripping characteristic B or C, 6 kA interrupting rating, Energy limiting class 3
- Short circuit protection
- Yes
- Standard
- 802.11 b/g/n
- Range (indoors)
- 30 metres
- RF band
- 2401 - 2483 МHz
- Max. RF power
- < 20 dBm
- Version
- 4.2 (BLE)
- Range (indoors)
- 10 metres
- RF band
- 2402 - 2480 MHz
- Max. RF power
- < 4 dBm
- Operating temperature
- -20–40 °C
- Operating humidity
- 30–70 % RH
- Max altitude
- 2000 metres
- Size (HxWxD)
- 38x42.5x16.5 mm / 1.50x1.67x0.65 inch
- Weight
- 24.3 g / 0.86 oz
- Screw terminals max torque
- 0.4 Nm / 3.5 lbin
- Conductor cross section
- 0.5 to 4 mm² / 20 to 11 AWG (solid, stranded, and bootlace ferrules)
- Conductor stripped length
- 5 to 6 mm / 0.20 to 0.24 in
- Mounting
- In-wall
- Shell color
- Shell: Lime Print: Black
- Connector color
- Black
- Max. output power
- 200 W
- Voltmeter range (AC)
- 180 V - 240 V
- Voltmeter accuracy
- ± 5 % (when used with neutral)
- Ammeter range (AC)
- 0 A - 3 A,
- Ammeter accuracy
- ± 5 % (when used with neutral)
- Internal-temperature sensor
- Yes
- CPU
- * ESP32 C3 * STM32 G051
- Clock frequency
- ESP32 C3: 40 Mhz
- Flash
- 8 MB
- Schedules
- 20
- Webhooks (URL actions)
- 20 with 5 URLs per hook...
- Scripting
- Yes
- MQTT
- Yes
- Advanced schedules
- Yes
- KVS (Key-Value Store)
- Yes
Use cases
Lights that ease into the evening
Schedules on the dimmer set brightness and fade time as well as the hour, so the living room drifts down after dinner instead of snapping between full and off. Run it in reverse for gentler mornings.
Down to a glow for movie night
Drop the downlights to a glow from the couch, using the app or a voice assistant, then bring them back up when it's time to tidy. The wall switch still works for everyone else.
Common questions
Quick answers before you buy. We test this gear ourselves. Can't find yours? Ask our Melbourne team
Yes. Shelly relays wire into 240V mains circuits, and in Australia that work must be done by a licensed electrician. A single relay is a quick job.
It works with or without one. Where there's no neutral in the switch box and the lights are low-wattage LEDs, add the Shelly Bypass for Dimmer to keep it stable.
No. It connects to your Wi-Fi and works from the Shelly app with no hub and no subscription. Schedules and automations run on the device itself, so they keep working if the internet drops out.
Shelly · Dimmer Gen3