Shelly Plus 2PM
Device Identification
- Device name: Shelly Plus 2PM
- Device model: SNSW-002P16EU
- Device SSID: ShellyPlus2PM-XXXXXX
Short Description
The Shelly Plus 2PM is a compact, two-channel smart switch with built-in power measurement and cover control. It enables remote control of electrical appliances via smartphone, tablet, PC, or home automation systems. The device operates either standalone on a local Wi-Fi network or through cloud-based home automation services.
With internet connectivity, users can access, control, and monitor the Shelly Plus 2PM from anywhere. It is designed for retrofit installation in standard electrical wall boxes, behind power outlets, light switches, or other space-constrained locations.
The device features an embedded web interface for configuration, monitoring, and real-time control of its functions.
Main Applications
- Residential
- MDU (Multi Dwelling Units – apartments, condominiums, hotels, etc.)
- Light commercial (small offices, retail stores, restaurants, gas stations, etc.)
- Government/municipal
- University/college
Integrations
- Google Assistant
- Samsung SmartThings
- Amazon Alexa
Simplified Internal Schematics
Device Electrical Interfaces
Inputs
- Two switch/button inputs on screw terminals: S1 and S2
- Three power supply inputs on screw terminals: 1 N (+) and 2 L (Ʇ)
Outputs
- Two relay outputs with integrated power measurement, accessible via screw terminals
Add-on Interface
- Shelly proprietary serial interface
⚠ CAUTION! High voltage is present on the add-on interface when the device is powered. Handle with care.
Connectivity
- Wi-Fi (802.11 b/g/n)
- Bluetooth 4.2
Safety Features
- Overheating protection
- Overvoltage protection
- Overcurrent protection
- Overpower protection
- Obstacle detection (in cover mode)
- Safety switch (in cover mode)
Supported Load Types
- Resistive (incandescent bulbs, heating devices)
- Capacitive (capacitor banks, electronic equipment, motor start capacitors)
- Inductive with RC snubber (LED drivers, transformers, fans, refrigerators, air conditioners)
User Interface
Inputs
- One (Reset) button
- Press and hold for 5 seconds to enable Access Point mode and Bluetooth connection
- Press and hold for 10 seconds to perform a factory reset
Outputs
- Monochrome LED indicator with the following status patterns:
| Status | LED Behavior |
|---|---|
| AP enabled, Wi-Fi disabled | 1 sec ON / 1 sec OFF |
| Wi-Fi enabled, not connected | 1 sec ON / 3 sec OFF |
| Connected to Wi-Fi network | Constantly ON |
| Cloud enabled, not connected | 1 sec ON / 5 sec OFF |
| Connected to Shelly Cloud | Constantly ON |
| OTA (Over-the-Air Update) | 0.5 sec ON / 0.5 sec OFF |
| Button pressed and held for 5 seconds | 0.5 sec ON / 0.5 sec OFF |
| Button pressed and held for 10 seconds | 0.25 sec ON / 0.25 sec OFF |
Note: These states are prioritized in order—later states override earlier ones.
Specifications
| Category | Specification |
|---|---|
| Physical | |
| Size (HxWxD) | 37 × 42 × 16 ±0.5 mm / 1.46 × 1.65 × 0.63 ±0.02 in |
| Weight | ~45 g |
| Mounting | Wall console |
| Screw terminal max torque | 0.4 Nm / 3.5 lbf·in |
| Conductor cross section | 0.5 to 1.5 mm² / 20 to 16 AWG |
| Conductor stripped length | 5 to 6 mm / 0.20 to 0.24 in |
| Shell material | Plastic |
| Color | Black |
| Environmental | |
| Ambient temperature | -20 °C to 40 °C / -5 °F to 105 °F |
| Humidity | 30% to 70% RH (non-condensing) |
| Max altitude | 2000 m / 6562 ft |
| Electrical | |
| Power supply | 110–240 VAC / 24 VDC ±10% |
| Power consumption | < 1.4 W |
| Output circuits ratings | |
| Max switching voltage (AC) | 240 V |
| Max switching voltage (DC) | 30 V |
| Max switching current (AC) | 10 A per channel, 16 A total, 18 A peak total |
| Max switching current (DC) | 10 A |
| Sensors & Meters | |
| Internal temperature sensor | Yes |
| Voltmeter (AC) | Yes |
| Ammeter (AC) | Yes |
| Radio | |
| RF band | 2400 – 2495 MHz |
| Max RF power | <20 dBm |
| Wi-Fi protocol | 802.11 b/g/n |
| Wi-Fi range | Up to 30 m indoors / 50 m outdoors (varies by environment) |
| Bluetooth protocol | 4.2 |
| Bluetooth range | Up to 10 m indoors / 30 m outdoors (varies by environment) |
| MCU | |
| CPU | ESP32-U4WDH |
| Flash | 4 MB |
| Firmware capabilities | |
| Schedules | 20 |
| Webhooks (URL actions) | 20, with up to 5 URLs per hook |
| Scripting | Yes |
| MQTT | Yes |
| CoAP | No |
Basic Wiring Diagrams
Dual-channel Switch Mode, AC Power Supply
Dual-channel Switch Mode, DC Power Supply
Cover Mode
Legend
| Symbol | Description |
|---|---|
| Terminals | |
| N | Neutral terminal |
| L | Live (110–240 VAC) terminal |
| O1, O2 | Load circuit output terminals |
| + | 24 VDC positive terminal |
| Ʇ | 24 VDC negative terminal |
| S1, S2 | Switch input terminals |
| Wires | |
| N | Neutral wire |
| L | Live (110–240 VAC) wire |
| + | 24 VDC positive wire |
| - | 24 VDC negative wire |
Troubleshooting
(Content to be added)
Web Interface Guide
For detailed instructions on using the Shelly Plus 2PM web interface:
Printed User Guide
Shelly Plus 2PM Multilingual Printed User and Safety Guide.pdf
Compliance
- Shelly Plus 2PM Multilingual EU Declaration of Conformity
- Shelly Plus 2PM UK PSTI ACT Statement of Compliance
- Shelly Plus 2PM x2 UK PSTI ACT Statement of Compliance
- Shelly Plus 2PM AU/NZ Certificate for Suitability