Shelly
Pro 3 Smart Relay
Three circuits from one DIN-rail module, with Ethernet and dry-contact outputs. Built for the switchboard.
$109.95 inc GST In stock at supplier · dispatches in 5 business days
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.
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Three channels
Switches three circuitsThree circuits from one module, each on its own control.
Selected -
Four channels
Switches four circuitsFour circuits from one module, each on its own control.
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.
Not available with Three channels.
1
Free shipping over $150 Ordered in from our supplier. Allow about 5 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
Smart control from the switchboard, switches untouched
Pro relays install at the switchboard, so the smart layer lives in one place instead of scattered through wall boxes around the house. Every wall switch stays exactly where it is and keeps working the way it always has; the relay adds app control, schedules and automations on top. It's the tidiest way to make a whole house smart without changing a single thing the family touches.
Installed at the board, not in wall boxes
Every existing switch keeps working
One location for your electrician to service
DIN rail and Ethernet, like the rest of your board
The Pro series mounts on a DIN rail alongside your breakers and adds an Ethernet port, so control traffic can run over cable rather than Wi-Fi. Multi-channel models switch several circuits from one unit, and the form factor is one your electrician already knows. Everything the compact relays do, schedules, scripting and local control included, is here too.
DIN-rail mount
Ethernet plus Wi-Fi
Multiple circuits from one unit
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
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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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Ethernet
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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 | Gen4 | Pro This model |
|---|---|---|---|
| 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 | Channels | Energy monitoring | Price |
|---|---|---|---|
| Pro 1 Smart Relay | 1 channel | No | $89.95 |
| Pro 2 Smart Relay | 2 channels | No | $99.95 |
| Pro 3 Smart RelayViewing | 3 channels | No | $109.95 |
| Pro 1PM Smart Relay | 1 channel | Yes | $99.95 |
| Pro 2PM Smart Relay | 2 channels | Yes | $134.95 |
| Pro 4PM Smart Relay | 4 channels | Yes | $169.95 |
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.
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 · 2:25
How to install it
Shelly's own step-by-step install, from isolating the power to mounting it on the DIN rail and wiring it in.
Watch setup videoNo specifications match.
Build
- Type
- Module
- Module size
- 3 modules
- Form
- DIN-rail
- Housing material
- Plastic
- Power
- Hardwired
- Supply voltage
- 110–240 V
- Standby power
- 3 W
- Generation
- Gen2
- Max current per circuit
- 16 A
- Neutral required
- Yes
- Power supply voltage DC
- N/A
- Neutral not needed
- No
- Dry-contact mode
- Yes
- Energy monitoring
- No
- Drives blinds & shutters
- No
- Local control
- Yes
- Standard
- 802.11 b/g/n
- Range (indoors)
- 30 metres
- Version
- 4.2
- Range (indoors)
- 10 metres
- Operating temperature
- -20–40 °C
- Operating humidity
- 30–70 % RH
- Max altitude
- 2000 metres
- Size (HxWxD)
- 96x53x59 ±0.5 mm / 3.78x2.01x2.32 ±0.02 in
- Mounting
- DIN rail
- Screw terminals max torque
- 0.4 Nm / 4.43 lbin
- Conductor cross section
- 0.5 to 2.5 mm² / 20 to 14 AWG
- Conductor stripped length
- 6 to 7 mm / 0.24 to 0.28 in
- Color
- Black
- Max switching voltage AC
- 240 V
- Max switching voltage DC
- 30 V
- Max switching current AC
- 16 A per channel, 48 A total
- Max switching current DC
- 16 A per channel, 48 A total
- Internal-temperature sensor
- Yes
- RF band
- 24010- 2495 MHz
- Max. RF power
- <20 dBm
- CPU
- ESP32-D0WDQ6
- Flash
- 8 MB
- Schedules
- 20
- Webhooks (URL actions)
- 20 with 5 URLs per hook
- Scripting
- Yes
- MQTT
- Yes
- CoAP
- No
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.
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.
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 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.
Common questions
Quick answers before you buy. We test this gear ourselves. Can't find yours? Ask our Melbourne team
Yes. Pro models wire into the switchboard, which is licensed-electrician work in Australia. For a sparkie it's a familiar job: the unit clips onto the DIN rail like any other module.
In the switchboard. Pro models mount on a DIN rail alongside your breakers and add an Ethernet port for wired control, which is the right shape for whole-home and multi-circuit installs.
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.
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 · Pro 3 Smart Relay