Shelly
2PM Gen4 Smart Relay
Two metered channels with Matter, Zigbee and Wi-Fi 6: two independent circuits, or a blind motor in cover mode.
$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.
Selected
Module Size
Standard $49.95 
Mini
Not available
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.
Not available with Two channels.
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.
Selected
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.
Not available with Two channels. -
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.
Selected
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 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
See what every circuit really uses
PM models meter their own output, so you can watch live power draw and review consumption history per channel in the app. That's enough to find the appliances quietly costing you money, confirm the hot water or pool pump actually ran, or catch a heater someone left on. Set thresholds and the relay can act on them itself, switching off a load that draws too much for too long.
Live power draw and consumption history
Per-channel metering
Overpower protection you can configure
Runs blinds and shutters, not just lights
Switch the two channels into cover mode and the relay drives a shutter, blind or awning motor instead: one channel up, one channel down, with calibrated position control so you can send it to exactly half open. Power metering tells the relay when the motor hits its end stop, so calibration is automatic.
Calibrated position control
Works with standard AC shutter and awning motors
One device per motor
Matter, Zigbee and Wi-Fi 6 built in
Gen4 is Shelly's newest platform and the most connected: Matter support is enabled out of the box, so it joins Apple Home, Google Home, Alexa or SmartThings directly. Wi-Fi 6 and Bluetooth 5 are standard, and there's a Zigbee 3.0 radio, so the same hardware can run as a Zigbee device on a hub such as Home Assistant instead. It can also act as a gateway for Shelly BLU sensors and as a range extender for the network it's on.
Matter enabled by default
Switchable Zigbee 3.0 firmware
Gateway for Shelly BLU Bluetooth sensors
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.
2
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 Apple Home
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Pairs with Google Home
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Pairs with Home Assistant
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Pairs with SmartThings
Works with Matter
This relay also works with Matter, so it connects to any Matter-compatible platform or controller, not just the ones above.
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
or
Phone to relay, through a hub
An alternative to Wi-Fi: the hub speaks Zigbee to the relay, so it joins a system you already run, like Home Assistant or SmartThings, instead of the Shelly app.
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Zigbee
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 This model | 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 Relay | 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 RelayViewing | 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 · 2:13
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
- Channels
- 2 channels Also available: 1
- Form
- In-wall
- Housing material
- Plastic
- Power
- Hardwired
- Supply voltage
- 110–240 V
- Standby power
- 1.4 W
- Generation
- Gen4 Also available: Gen3
- Max current per circuit
- 10 A
- Neutral required
- Yes
- External protection
- Tripping characteristic B or C, 16A max. rated current, min. 6 kA interrupting rating, energy limiting class 3
- Dry-contact mode
- No
- Energy monitoring
- Yes
- Drives blinds & shutters
- Yes
- Local control
- Yes
- Standard
- 802.11 b/g/n/ax
- Range (indoors)
- 30 metres
- RF band
- 2412 - 2472 МHz
- Max. RF power
- < 20 dBm
- Version
- 5.0
- Range (indoors)
- 10 metres
- RF band
- 2402 - 2480 MHz
- Max. RF power
- < 4 dBm
- Range (indoors)
- 100 metres
- Protocol
- 802.15.4
- RF bands
- 2400 to 2483.5 MHz
- Max. RF power
- < 20 dBm
- Operating temperature
- -20–40 °C
- Operating humidity
- 30–70 % RH
- Max altitude
- 2000 metres
- Size (HxWxD)
- 37x42x16 ±0.5 mm / 1.46x1.65x0.63 ±0.02 inch
- Weight
- 30 g / 1.06 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 box
- Shell color
- Black
- Terminals color
- Grey (Mouse Grey)
- Max. switching voltage
- * 240 V~
- Max. switching current AC
- 10 A (per channel), 16 A (total), 18 A (total peak)
- Voltmeter (AC)
- Yes
- Ammeter (AC)
- Yes
- Internal-temperature sensor
- Yes
- CPU
- ESP-Shelly-C68F
- 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
Two circuits, one relay
Each channel is its own switched, metered circuit: O1 carries the first light, O2 the second, and the wall switches land on S1 and S2. Mains comes in once on L and N and feeds both.
O1Switched, metered active out to the first light
O2Switched, metered active out to the second light
S1Wall switch for channel 1
S2Wall switch for channel 2
L230 V active in (either L terminal)
NNeutral in
In Australia, fixed 230 V wiring is licensed-electrician work. Use these diagrams to plan the job and brief your electrician.
Use cases
Blinds and awnings that know the time of day
Motorised blinds, shutters and awnings get real position control: open for the morning sun, closed against the afternoon heat, from a schedule or your phone. Works with standard AC cover motors.
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.
Catch the appliance left running
With metering on the circuit, the relay notices what the appliance is doing: an alert when the washing machine finishes, or when the freezer stops drawing power. It can even switch off a heater that's been on too long.
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. Matter is enabled out of the box, so it joins Apple Home, Google Home, Alexa or SmartThings directly. It can also run as a Zigbee device on a hub such as Home Assistant instead.
Yes. This model meters its own output, so the app shows live power draw and consumption history. You can also set thresholds and have the relay switch off on them.
Yes. Switch it to cover mode and the two channels drive a standard AC shutter, blind or awning motor, with calibrated position control.
Shelly · 2PM Gen4 Smart Relay