Shelly
1 Gen3 Smart Relay
A compact Wi-Fi relay that hides behind an existing switch and adds app control, schedules and automations. The dry-contact output also makes it the classic pick for garage doors and gates.
$24.95 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.
Module Size
Filter guide
Which module size do I need?
Smart relays come in two builds: in-wall modules that hide behind a switch or power point, and DIN-rail modules that clip into your switchboard. Size decides where it fits.
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Standard
About 37 x 42 mmThe full-size in-wall module. Fits most Australian wall boxes and mounting brackets, and takes the most common wiring layouts without fuss.
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Mini
About 29 x 34 mmA shrunk version of the same module. Same job, smaller case, so it fits behind a mech in a wall box that is already tight for room.
Channels
Filter guide
What's a channel?
One channel switches one circuit. A 2-channel relay behind a single plate can run two lights on their own schedules, or a light and an exhaust fan, without needing a second device.
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One channel
Switches one circuitSwitches one thing on its own: a light, a fan, an exhaust.
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Two channels
Switches two circuitsTwo circuits controlled separately, like both halves of a double switch.
Not available with Switching only.
Power Metering
Filter guide
What does energy monitoring do?
The relay measures how much power the circuit is drawing and reports it in the app, so you can see what a heater or pool pump actually costs to run and build automations around usage. Models without it still switch as normal; they just don't measure.
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Switching only
No power measurementTurns the circuit on and off without measuring power use. Choose this where you only need control, not consumption data.
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Energy monitoring
Measures power useMeasures the power the connected circuit is using, so you can see consumption per device in the app. These are the models with PM in the name.
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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 relay 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
Switches things that aren't lights
The output contact is electrically isolated, with no voltage on it from the relay itself. That's what lets it safely trigger things a normal smart switch can't touch: garage door openers, gate motors, irrigation solenoids and other low-voltage control circuits. It's the difference between a relay and a smart light switch, and it's why electricians reach for these.
Potential-free (volt-free) output
Triggers garage doors, gates and irrigation controllers
Switches low-voltage and mains circuits alike
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
What is a Shelly relay?
A relay is a switch you never see. It wires into the circuit between the supply and the light or appliance, so that circuit can be switched from the wall, from your phone, from a schedule or from an automation. The switch already on the wall stays wired in and keeps working for anyone who just wants to flick it.
The channels
One channel per circuit
Channels decide how many you buy. The range runs from one to four, so a single light takes a one-channel module and a plate driving two circuits takes a two-channel. Each channel switches its circuit independently.
The two homes
Wall box or switchboard
The smaller modules sit in the wall box behind an existing switch, where the constraint is the space left behind the mechanism. Pro units clip onto DIN rail in the switchboard instead, which is where whole circuits and three-phase work belong.
The metering
What PM on the end means
A PM model measures the load it is switching and reports power and accumulated energy alongside the on-off state. Models without it switch only. The specifications on this page tell you which one you are looking at.
The control
It runs without the internet
Schedules and scenes are stored on the relay and run there, so the light still comes on at dusk when your connection is out. Every unit serves its own web interface on your network with no account, and Shelly publishes its local API, which is why Home Assistant ships an official integration.
Getting started
1
One circuit at a time The usual start
Most people begin with a single module behind the switch they use most, often the lounge or the outside light. The plate and the wiring stay as they are, and that one circuit becomes something you can schedule or run from your phone. Add the next one whenever you feel like it.
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The whole switchboard at once Or start at the board
When the board is already open for a rewire, a new build or a switchboard upgrade, Pro units on DIN rail cover several circuits from one place. They run the same firmware and the same app as the in-wall modules, so a house can mix the two freely.
Nothing has to be settled up front. Each relay works on its own, there is no hub to buy first, and you can start with one circuit and go as far as you like from there.
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.
Which relay do I need?
Gen3 is the value pick and does everything most homes need. Gen4 adds Zigbee and Wi-Fi 6, and Matter is on out of the box, so it joins Apple Home or a Zigbee network with no hub in between. Pro is DIN rail hardware for the switchboard.
If you run the Shelly app or Home Assistant over Wi-Fi and just want a reliable relay behind a switch, save the money and buy Gen3. Pay the difference for Gen4 if Matter or Zigbee matters to your setup. One thing to know: Zigbee on Gen4 is an either/or mode, so a relay switched to Zigbee leaves Wi-Fi entirely. And if you're searching for Gen2, it shipped under different names: the Plus and Pro ranges.
| Feature | Gen3 This model | Gen4 | Pro |
|---|---|---|---|
| Best for | Everyday Wi-Fi setups on a budget | New setups and Matter or Zigbee homes | Switchboards and bigger jobs |
| Connects over | Wi-Fi Bluetooth | Wi-Fi 6 Bluetooth Zigbee | Wi-Fi Bluetooth Ethernet |
| Matter | On some models, turned on in settings | Built in and on by default | Not supported |
| Mounting | Behind the switch or power point | Behind the switch or power point | DIN rail in the switchboard |
| Price from | $24.95 | $34.95 | $89.95 |
| Model | Generation | Module size | Channels | Energy monitoring | Price |
|---|---|---|---|---|---|
| 1 Gen3 Smart RelayViewing | Gen3 | Standard | 1 channel | No | $24.95 |
| 1 Mini Gen3 Smart Relay | Gen3 | Mini | 1 channel | No | $24.95 |
| 1 Gen4 Smart Relay | Gen4 | Standard | 1 channel | No | $34.95 |
| 1 Mini Gen4 Smart Relay | Gen4 | Mini | 1 channel | No | $34.95 |
| 1PM Gen3 Smart Relay | Gen3 | Standard | 1 channel | Yes | $29.95 |
| 1PM Gen4 Smart Relay | Gen4 | Standard | 1 channel | Yes | $49.95 |
| 1PM Mini Gen4 Smart Relay | Gen4 | Mini | 1 channel | Yes | $39.95 |
| 2PM Gen3 Smart Relay | Gen3 | Standard | 2 channels | Yes | $39.95 |
| 2PM Gen4 Smart Relay | Gen4 | Standard | 2 channels | Yes | $49.95 |
Behind the switch
Fits in the wall cavity behind an existing switch or power point. The switch on the wall stays and still works; the relay sits behind it and makes the circuit smart.
In the switchboard
Clips onto the standard rail in your switchboard, next to the circuit breakers. Keeps everything in one serviceable spot, which suits whole-home installs and bigger jobs.
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.
Which module size do I need?
Smart relays come in two builds: in-wall modules that hide behind a switch or power point, and DIN-rail modules that clip into your switchboard. Size decides where it fits.
What's a channel?
One channel switches one circuit. A 2-channel relay behind a single plate can run two lights on their own schedules, or a light and an exhaust fan, without needing a second device.
What does energy monitoring do?
The relay measures how much power the circuit is drawing and reports it in the app, so you can see what a heater or pool pump actually costs to run and build automations around usage. Models without it still switch as normal; they just don't measure.
Specifications & Installation
Setup · 2:07
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
- Module size
- Standard Also available: Mini
- Channels
- 1 channel
- Form
- In-wall
- Housing material
- Plastic
- Power
- Hardwired
- Supply voltage
- 110–240 V
- Standby power
- 1.2 W
- Generation
- Gen3 Also available: Gen4
- Max current per circuit
- 16 A
- Neutral required
- Yes
- External protection
- Cable protection switch in accordance with EN60898-1 (tripping characteristic B or C, max. 16 A rated current, min. 6 kA interrupting rating, energy limiting class 3)
- Dry-contact mode
- Yes
- Energy monitoring
- No Also available: true
- Drives blinds & shutters
- No
- Local control
- Yes
- Standard
- 802.11 b/g/n
- Range (indoors)
- 30 metres
- Version
- 4.2 with BLE
- Range (indoors)
- 10 metres
- RF band
- 2400 - 2483.5 MHz
- Max. RF power
- < 4 dBm
- Operating temperature
- -20–40 °C
- Operating humidity
- 30–70 % RH
- Max altitude
- 2000 metres
- Size (HxWxD)
- 37x42x16 / 1.46x1.65x0.63
- Weight
- 26 g / 0.92 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
- 6 to 7 mm / 0.24 to 0.28 in
- Mounting
- Wall console
- Shell color
- Blue
- Terminal Color
- Black
- Max. switching voltage
- * 240 V~ * 30 V⎓
- Max. switching current
- * 16 A/240 V~ * 10 A/30 V⎓
- Internal-temperature sensor
- Yes
- Protocol
- 802.11 b/g/n
- RF band
- 2401 - 2483 МHz
- Max. RF power
- < 20 dBm
- Range
- Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors (Depends on local conditions)
- CPU
- ESP-Shelly-C38F
- Flash
- 8MB
- Schedules
- 20
- Webhooks (URL actions)
- 20 with 5 URLs per hook
- Scripting
- Yes
- MQTT
- Yes
Wiring diagrams
Active (supply)Neutral / 0 VSwitched loadSwitch signal / dry contact
One circuit, switched through O
Mains comes in on L and N, a short bridge feeds the relay input, and O carries the switched active out to the light. The existing wall switch lands on SW, so the physical switch keeps working alongside the app.
L230 V active in
NNeutral in
IRelay feed — bridged from L
OSwitched active out to the light or appliance
SWExisting wall switch
12V12 V⎓ supply option — not used in this AC setup
In Australia, fixed 230 V wiring is licensed-electrician work. Use these diagrams to plan the job and brief your electrician.
Use cases
Open the garage door or gate from your phone
Wire the relay across the opener's button terminals and the roller door, swing gate or door release answers your phone as well as the wall button. Pair it with a contact sensor and you'll also know whether the door is actually shut.
Outdoor lights on at sunset, off at midnight
Porch, path and garden lighting follows the sun through the year without you touching a thing. It also makes the house look lived-in while you're away.
A bathroom fan that runs itself
The exhaust fan keeps running after the light goes off, long enough to clear the steam, then shuts itself down. Add a humidity sensor and it only runs when the room needs it.
A warm towel rail on winter mornings
Schedule the rail for weekday mornings and it's warm when you step out of the shower, off again before you leave. No more discovering it's been heating an empty house all day.
Water the garden on a schedule
The relay's dry contact drives standard irrigation solenoids, so beds and lawn water on a schedule without a dedicated controller. Rain coming? Skip the next run from your phone.
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.
Yes, this model needs a neutral at the install point. If your switch box has no neutral, look at the Shelly 1L or 2L instead: they're made for exactly that wiring.
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.
Yes. The output is a potential-free (dry) contact, so it can safely trigger garage door openers, gate motors and other low-voltage control circuits as well as switching mains loads.
Shelly · 1 Gen3 Smart Relay