Shelly 2L Gen3
Device Identification
- Device name: Shelly 2L Gen3
- Device model: S3SW-0A2X4EUL
- Device SSID: Shelly2LG3-XXXXXXXXXXXX
- Device Bluetooth ID: 0x1013
Short Description
Shelly 2L Gen3 is a compact, two-channel smart switch designed for precise lighting control. A standout feature is that it doesn't require a neutral wire to operate—however, it needs a Shelly Bypass 1L/2L Gen3 connected in parallel to the load at the first channel.
The device allows users to effortlessly control their lighting setups via smartphone, tablet, PC, or integrated home automation systems. It can function standalone on a local Wi-Fi network or integrate with cloud-based home automation services. As long as the device remains connected to a Wi-Fi router and the internet, users can access, control, and monitor their lighting configurations from anywhere.
Designed for space efficiency, Shelly 2L Gen3 fits snugly into standard electrical wall boxes, behind light switches, or in tight spaces. Its embedded Web Interface enables easy monitoring, control, and fine-tuning of device settings.
Note: This device is Matter-ready and can gain this functionality via firmware update.
Main Features
- Perfect to retrofit! No need for a neutral wire. Power and control lights or appliances using only a live wire.
- 2 channels! Control two separate lights or devices independently.
- Minimum bulb wattage: Requires a Shelly Bypass 1L/2L Gen3 to be installed next to the light, enabling control of bulbs greater than 5W.
- Wi-Fi Connectivity: Connects to your home Wi-Fi network for remote control via the Shelly app or other smart home platforms.
- Remote Control: Control devices remotely from anywhere with an internet connection using the Shelly app.
- Voice Control: Compatible with Amazon Alexa and Google Assistant for voice commands.
- Scheduling and Automation: Supports timers and routines (e.g., schedule lights to turn on/off at specific times).
- Compatibility:
- Designed and tested for compatibility with a wide range of lights.
- Works with voltages from 220–240 VAC.
- Compact Design: Fits easily into standard electrical boxes and behind switches.
- Protection: Equipped with an internal temperature sensor for overheating protection.
- Local and Remote Access: Control devices both locally (same Wi-Fi) and remotely (via internet).
- OTA Updates: Receives over-the-air firmware updates for enhanced functionality and security.
- Smart Home Ecosystems: Compatible with MQTT, Home Assistant, and more, making it versatile for smart home integration.
Main Applications
- Residential
- MDU (Multi Dwelling Units – apartments, condominiums, hotels, etc.)
- Light commercial (small offices, retail stores, restaurants, gas stations)
- Government/municipal
- University/college
Integrations
Amazon Alexa Supported Capabilities
- Toggle Controller
Google Smart Home Supported Traits
- On Off
Samsung SmartThings Supported Capabilities
- Switch
Simplified Internal Schematics
Device Electrical Interfaces
Inputs
- 2 switch/button inputs on screw terminals: S1, S2
- 1 power supply input on screw terminal: L
Outputs
- 1 switch/button signal output on screw terminal: Sx
- 2 relay outputs on screw terminals: O1, O2
Connectivity
- Wi-Fi
- Bluetooth
Safety Function
- Overheating protection
Supported Load Types
Output 1:
- Incandescent lights*
- LED lights*
* Without step-down transformers for lower-voltage lights
Output 2:
- Incandescent lights
- LED lights
- Fluorescent lights
- Fans
User Interface
Inputs
- One (Control) button
- Press and hold for 5 seconds: Enables Device access point and Bluetooth connection.
- Press and hold for 10 seconds: Factory reset.
Outputs
- LED (monocolor) indication:
- AP enabled, Wi-Fi disabled: 1 sec ON / 1 sec OFF
- Wi-Fi enabled but not connected: 1 sec ON / 3 sec OFF
- Connected to Wi-Fi network: Constantly ON
- Cloud enabled but not connected: 1 sec ON / 5 sec OFF
- Connected to Shelly Cloud: Constantly ON
- OTA (Over the Air Update): ½ sec ON / ½ sec OFF
- Button pressed and held for 5 seconds: ½ sec ON / ½ sec OFF
- Button pressed and held for 10 seconds: ¼ sec ON / ¼ sec OFF
Note: The list starts with initial status and lowest priority. Each subsequent state cancels the previous one.
Specifications
| Quantity | Value |
|---|---|
| Physical | |
| Size (HxWxD) | 37 × 42 × 16 ±0.5 mm / 1.46 × 1.65 × 0.63 ±0.02 in |
| Weight | 28 g / 1 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, bootlace ferrules) |
| Conductor stripped length | 6 to 7 mm / 0.24 to 0.24 in |
| Mounting | In-wall |
| Shell material | Plastic |
| Shell color | Cyan |
| Terminal color | Black |
| Environmental | |
| Ambient working temperature | -20 °C to 40 °C / -5 °F to 105 °F |
| Storage temperature | 10 °C to 40 °C |
| Humidity | 30 % to 70 % RH |
| Max. altitude | 2000 m / 6562 ft |
| Electrical | |
| Power supply | 220–240 V~, 50 Hz (Shelly Bypass required for load at O1) |
| Shelly Bypass included | Yes |
| Power consumption | < 1.2 W |
| Neutral not needed | Yes (Shelly Bypass required for load at O1) |
| Min. load without neutral and without Bypass | No (Bypass required for LED lights at O1); Not needed for incandescent lights |
| Output circuits ratings | |
| Max. switching voltage | 240 V~ |
| Max. switching power | |
| - O1 | 200 W |
| - O2 | 700 W |
| Sensors, meters | |
| Internal temperature sensor | Yes |
| Radio | |
| Wi-Fi Protocol | 802.11 b/g/n |
| RF band | 2401 – 2495 MHz |
| Max. RF power | < 20 dBm |
| Range | Up to 30 m / 100 ft indoors, 50 m / 160 ft outdoors (Depends on local conditions) |
| Bluetooth | |
| Protocol | 4.2 |
| RF band | 2400 – 2483.5 MHz |
| Max. RF power | < 4 dBm |
| Range | Up to 10 m / 33 ft indoors, 30 m / 100 ft outdoors (Depends on local conditions) |
| Microcontroller unit | |
| CPU | ESP-Shelly-C38F |
| Clock frequency | 160 MHz |
| RAM | 512 KB |
| Flash | 8 MB |
| Firmware capabilities | |
| Schedules | 20 |
| Webhooks (URL actions) | 20 with 5 URLs per hook |
| Scripting | Yes |
| MQTT | Yes |
Basic Wiring Diagram
Legend
| Terminals | Description | Wires | Description |
|---|---|---|---|
| S1 | Switch input terminal 1 | L | Live (220–240 V~) wire |
| S2 | Switch input terminal 2 | N | Neutral wire |
| Sx | Switch signal output terminal | ||
| L | Live (220–240 V~) terminal | ||
| O1 | Load circuit output terminal 1 | ||
| O2 | Load circuit output terminal 2 |
Shelly Smart Control
Troubleshooting
...
Components and APIs
Compliance
- Shelly 2L Gen3 multilingual EU declaration of conformity (2025-07-22)
- Shelly 2L Gen3 UK PSTI ACT Statement of compliance
Printed User Guide
Installation Guides
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