Shelly Plus 2PM Gen4 for Smart Home Energy Monitoring

Two independent channels on one tiny board is the pitch here. The Shelly Plus 2PM Gen4 measures 37 x 42 x 16 mm, yet it switches and separately meters two circuits, each rated to 10A (16A total). That's what makes it more than a switch: it's energy monitoring per channel, so you can see exactly what each load pulls. Tuck it behind a wall plate and control blinds, a pair of light circuits, or a fan and a pump, all while it reports voltage, current, and usage over Wi-Fi, Bluetooth, Zigbee, or Matter. Shelly's knowledge base lists the model as S4SW-002P16EU.

What It Is

It measures 37 x 42 x 16 mm and weighs 30 g, so it fits standard wall boxes. It handles two channels on the same phase, each with up to 10 A switching, 16 A continuous in total and 18 A peak. That suits lights, fans, or a blind motor in cover mode.

The standout is power metering with a voltmeter and ammeter, plus an internal temperature sensor. Shelly doesn't state the metering accuracy on that page. Power it with 110-240 V AC or 24 V DC, and it consumes less than 1.4 W itself. Gen4 adds Zigbee and Matter compatibility.

Specs and Numbers

This device packs solid hardware into a tiny package. Its ESP-Shelly-C68F processor comes with 8 MB flash. Switching is rated 240 V AC or 30 V DC, with an ammeter and voltmeter for AC measurements.

Wireless options shine: Wi-Fi (802.11 b/g/n/ax) reaches 30 m indoors/50 m outdoors; Bluetooth 5.0 up to 10 m indoors; Zigbee (802.15.4) extends to 100 m indoors/300 m outdoors. RF power is under 20 dBm (under 4 dBm for Bluetooth).

Firmware features include 20 schedules, 20 webhooks (5 URLs each), full scripting, and MQTT support. Screw terminals take conductors of 0.5-4 mm2 at 0.4 Nm torque, and it needs an external B or C curve breaker (16 A max, 6 kA breaking).

Here are the key specs in a simple list:

Key Points

• Dimensions: 37 x 42 x 16 mm (1.46 x 1.65 x 0.63 in)
• Weight: 30 g (1.06 oz)
• Power Supply: 110-240 V~ / 24 VDC ±10%
• Switching: 10 A per channel AC, 10 A DC; 16 A continuous total, 18 A peak
• Sensors: AC voltmeter, ammeter, temperature
• Connectivity: Wi-Fi, Bluetooth, Zigbee, Matter
• Protections: Energy limiting class 3

Fitting It Into Your Setup

Integration is where it excels in home automation. Choose Wi-Fi for direct app control via the Shelly Cloud, or Zigbee if you already run a Zigbee coordinator. Matter is the default pairing mode, with a default profile of Switch. Matter compatibility should work with Apple HomeKit, Google Home, and Alexa, though you still need a Matter controller in your home.

Bluetooth simplifies local setup and pairing. Advanced users get MQTT, an HTTP API, UDP, KNXnet/IP and scripting for custom logic, and the spec page lists no CoAP. Pair it with voice assistants for hands-free control: "Alexa, close the blinds" using its cover mode.

In any smart home, link it to sensors for automation. For example, trigger based on motion or temperature from other Shelly devices. It can work with SmartThings or Home Assistant via Zigbee or MQTT.

Where It Shines

This device fits many smart home scenarios, thanks to dual channels and metering.

• Blinds and Shutters: Cover mode controls a venetian blind or shutter motor, with obstacle detection and a safety switch; Shelly recommends motors with limit switches. Automate sunrise/sunset schedules to save energy and boost privacy.
• Appliance Monitoring: Track power on fans, pumps, or heaters per channel. Spot inefficient devices and cut bills with energy savings.
• Lighting Control: Switch two light circuits independently. Integrate with smart lighting for scenes via app or voice control.
• Small loads: Monitor split loads like a router or a valve. Use scripting for alerts on high usage.
• Fans: Switch on a schedule or a power threshold, within the 10 A channel limit.

Installation and First Setup

Getting it running is straightforward for DIY fans. First, power off the circuit. Mount in a wall box using the console. Wire channels to loads (same phase), neutral, and live. Torque screws to 0.4 Nm.

Download the Shelly Smart Control app (iOS/Android). Connect via Bluetooth for initial Wi-Fi setup. Matter is the default pairing mode, so scan the Matter code if you use it. For Zigbee, press the button 5 times to start inclusion for 3 minutes. The built-in web interface lets you configure modes: switch, cover, or metering. Test channels and run the calibration for shutters (Shelly mentions calibration for blind positioning but gives no procedure on that page).

Firmware updates happen over-the-air. For Zigbee, join a coordinator network. Scripting? Access via web for custom JS. Full guides in the app or knowledge base ensure quick troubleshooting.

Safety note: Use qualified electricians for installs. External breakers required.

Is the Shelly 2PM Gen4 Right for You?

Buy this if you need two things controlled and metered from one spot behind the wall: a pair of light circuits, a blind motor with slat control, or a fan paired with a pump. The dual channels and per-channel metering are the real draw. Zigbee needs a coordinator and Matter needs a Matter controller, but neither needs a Shelly-specific hub, which is handy for a retrofit.

Where's the limit? Each channel tops out at 10A, and 16A total, so don't split a big shared load expecting full current on both at once. It also lives inside a live wall box, so unless you're confident with mains wiring, get an electrician. Privacy-minded users can run the metering and dual-channel automations locally through MQTT and scripting, feeding a smart home ecosystem you actually control. For anyone weighing a single-channel relay against this, that second metered channel is the reason to step up. This page is based on Shelly's published specifications, not hands-on testing.