2PM Gen4 Smart Relay
The Shelly 2PM Gen4 has two metered channels with Matter, Zigbee and Wi-Fi 6. Switch two independent circuits, or drive a blind or roller shutter motor in cover mode.
$49.95 inc GST In stock · ships today
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?
Size decides where a module fits and whether it suits the space you have.
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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?
A channel is one output the device controls on its own. On a relay, each channel switches one circuit, so a 2-channel relay runs two lights separately. On an LED strip controller, each channel drives one colour line of the strip.
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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
Currently sold out.
Free shipping over $150 Order before 3pm Melbourne time on a weekday and it ships the same day.
30-day returns Unused items, easy online returns
3-year warranty Backed by Shelly
Everything you need to know
The Shelly 2PM Gen4 is a two-channel smart relay rated to 10 A per channel, with power metering and Matter support. Cover mode runs a blind or roller shutter motor. It needs a neutral wire and a licensed electrician to install.
Product features
Two circuits behind a double light switch
Behind a double light switch, one 2PM Gen4 controls both circuits, such as the living room and hallway lights. Each switch on the wall keeps working as it does now, and each channel gets its own app control, schedules and automations.
- Two independent channels in one module
- Suits double wall switches
- Needs a neutral wire in the wall box
Blinds, shutters and curtains in cover mode
When in cover mode, the Shelly 2PM Gen4's two channels drive a roller shutter, blind or curtain motor. Calibration gives precise open, close and stop positions, it can tilt the slats on Venetian blinds, and you can automate your covers by time or sun elevation.
- Calibrated position control
- Tilt control for Venetian blind slats
- Obstacle detection and safety switch support
Power metering on each channel
Each channel measures its own power use, so you can see what two appliances draw separately, like a coffee machine and a toaster on the same module. Set a limit per channel to get an alert or trigger an automation when a device goes over it.
- Separate metering per channel
- Alerts and automations on power limits
- 10 A per channel, 16 A total
Matter out of the box, Zigbee if you want it
Like every Gen4 relay, the 2PM Gen4 ships with Matter enabled and joins Apple Home, Google Home, Alexa or SmartThings directly. Home Assistant users can run it over Zigbee instead. It also extends your Wi-Fi and Zigbee networks and works as a gateway for Shelly BLU sensors.
- Matter enabled by default
- Zigbee option for Home Assistant
- Wi-Fi 6 and Bluetooth 5.0
Bathroom fan and towel rail on one module
Schedules and scripts run on the relay, so they keep going through an internet outage. Put a bathroom fan on one channel with a humidity trigger from a Shelly BLU H&T, and a towel rail or mirror heater on the other with its own schedule.
- Up to 20 schedules, plus scripting
- Built-in web interface, no cloud account needed
- Fans need an RC snubber
What is a Shelly relay?
A relay is a small module that hides in the wall box behind a switch, or on the rail in your switchboard, wired in between the power and whatever it controls. That might be a light, an exhaust fan, a towel rail, a pump, or the motor that opens your garage door. Nothing on show has to change. The switch stays on the wall and keeps working exactly as it does now, and the same circuit can also be turned on from your phone, on a schedule, or by an automation.
The number
One channel per circuit
The number in the name is how many things the module can switch on its own, from one up to four. A single light or exhaust fan takes a 1. A double light switch controlling two separate lights takes a 2, and each side still works on its own. The Pro 4PM goes up to four.
Pro and Mini
Where the module lives
Everything else in the name is about size and place. The standard module sits in the wall box behind your switch, and the Mini is a smaller version of it for when there is very little room left in the box. Pro units are built for the switchboard, clipping onto DIN rail, which is where whole circuits and three-phase work belong.
PM
What PM on the end means
PM is power measurement. Those models report what the circuit is drawing and the energy it has used over time, alongside the on or off state, so you can see what a heater or a pool pump actually costs to run. Models without PM switch the circuit and tell you nothing about it.
Gen 3 and Gen 4
What the generation changes
The generation tells you which protocols the module speaks. Gen 3 is Wi-Fi and Bluetooth. Gen 4 adds Zigbee and has Matter built in, though it runs one or the other, not both at once. The wiring, the app and the local control are identical. Pro units carry no generation in their name.
The existing controls
Nothing you already use stops working
The switch on the wall keeps doing what it has always done, and so does the button inside the garage. Whatever controls that circuit now carries on working, and the relay adds a second way in from an app, a schedule or a voice assistant. Nobody in the house has to change how they do things.
Smart bulbs
Smart lights that stay reachable
Smart bulbs only work while they have power, so one flick of the wall switch makes them unreachable via an app, like Philips Hue. Set the relay to Detached and the bulbs stay powered while the switch becomes a button your smart home can read, which is how a system like Home Assistant gets the switch and the bulbs working together again.
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
Also works with Matter, so it can join other Matter platforms as well as the ones above.
Connects over
On your Wi-Fi
Joins your home network, so you control it from the app with no hub or bridge.
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Wi-Fi
or
On your Zigbee network
Joins a Zigbee network you already run, like Home Assistant or SmartThings, instead of the Shelly app.
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Zigbee
Bluetooth
Used to set it up, and can also act as a gateway that connects Shelly's Bluetooth sensors, like the BLU Motion, to your network.
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Bluetooth
Works offline
Keeps working on your home network when the internet is down.
Scripts
13
Give it jobs the app can't
Scripts add jobs the relay can't do with the Shelly app's schedules and actions alone, like acting on the weather forecast or sending an alert to your phone. Each one is a small program that runs on the relay itself: copy it, paste it into the device's script editor and press Start. It doesn't need a hub, a cloud account or a subscription.
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Heating & hot water Cap how many hours a heater or pump runs each day -
Lighting Control a Philips Hue room from a wall switch -
Safety Garage door that closes itself after you forget -
Garden Garden watering that skips the run when it rains -
Safety Holiday lights that come on at a different time each night -
Heating & hot water Hot water or pool pump on off-peak times, with a boost switch
Scripts are free; installing one takes about two minutes.
Which relay do I need?
Gen3 is the value pick for everyday Wi-Fi setups. Gen4 adds an upgraded processor, Wi-Fi 6 and Zigbee. Matter is on out of the box, so it pairs with Apple Home, Google Home or Alexa directly, without the need for the Shelly app. Pro is built to go inside your switchboard, clipping onto the same DIN rail as your circuit breakers, and connects over Ethernet as well as Wi-Fi.
If you want a reliable relay behind a switch at the lowest price, and you run the Shelly app or Home Assistant over Wi-Fi, Gen3 does the job. For a new setup, Gen4 is the one we'd pick. If you already run a Zigbee network, Gen4 slots straight into it, and because every Gen4 relay is also a Zigbee repeater, each one you add extends and strengthens that network. A relay on Zigbee gives up Matter and its own settings page, so you choose which each one runs. 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 | $22.95 | $34.95 | $89.95 |
| Model | Generation | Module size | Channels | Energy monitoring | Price |
|---|---|---|---|---|---|
| 1 Gen3 | Gen3 | Standard | 1 channel | No | $24.95 |
| 1 Mini Gen3 | Gen3 | Mini | 1 channel | No | $22.95 |
| 1 Gen4 | Gen4 | Standard | 1 channel | No | $34.95 |
| 1 Mini Gen4 | Gen4 | Mini | 1 channel | No | $34.95 |
| 1PM Gen3 | Gen3 | Standard | 1 channel | Yes | $25.95 |
| 1PM Gen4 | Gen4 | Standard | 1 channel | Yes | $39.95 |
| 1PM Mini Gen4 | Gen4 | Mini | 1 channel | Yes | $39.95 |
| 2PM Gen3 | Gen3 | Standard | 2 channels | Yes | $35.95 |
| Viewing: 2PM Gen4 | 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?
Size decides where a module fits and whether it suits the space you have.
What's a channel?
A channel is one output the device controls on its own. On a relay, each channel switches one circuit, so a 2-channel relay runs two lights separately. On an LED strip controller, each channel drives one colour line of the strip.
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: One channel
- 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
- SKU
- SHE-RLY-0009
- MPN
- S4SW-002P16EU
- Barcode
- 3800238071325
Wiring diagrams
Circuit overview
1Light 12Light 23Switch 14Switch 2
Active (supply)Neutral / 0 VSwitched loadSwitch signal / dry contact
In Australia, fixed 230 V wiring is licensed-electrician work. Use these diagrams to plan the job and brief your electrician.
Showing the whole circuit
What you can do with it
Bathroom fan that clears the steam, then turns itself off
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. Control with any of
Open and close blinds and awnings at sunrise and sunset
Motorised blinds, shutters and awnings open at sunrise, close at sunset and drop to a set position for the afternoon heat, from a schedule or your phone. Works with standard 230 V cover motors. Control with any of 
Open and close the blinds from a wall switch
Keep the up and down switch you have and fit a Shelly behind it, so the blinds run from the wall and from your phone. Add a second switch anywhere in the room without new cable. Control with any of 
Outdoor lights on at sunset, off at midnight
Porch, path and garden lights follow the sun through the year without you touching a switch. Run the lights you have from a Shelly relay, or fit Philips Hue outdoor lights, and set it up in their app or Home Assistant. Control with any of 
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. Control with any of 
Switch off an appliance left running
A metering relay on the heater's supply switches it off after the time you set, and can message you when it has been drawing power too long. The same alert can tell you the washing has finished. Control with any of Common questions
Quick answers before you buy. We test this gear ourselves. Can't find yours? Ask our Melbourne team
Yes, though it's a small job. Shelly relays wire into 240V mains circuits, so in Australia a licensed electrician fits them, and a single relay doesn't take a sparky long.
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