Shelly 2L Gen3
Device Identification
- Device name: Shelly 2L Gen3
- Device model: S3SW-0A2X4EUL
- Device SSID: Shelly2LG3-XXXXXXXXXXXX
- Device Bluetooth ID: 0x1013
Short Description
The Shelly 2L Gen3 is a compact, two-channel smart switch designed for precise lighting control. A key feature is that it operates without requiring a neutral wire. However, it must be used in conjunction with a Shelly Bypass 1L/2L Gen3 connected in parallel to the load at Channel 1. The device enables seamless control of lighting setups via smartphone, tablet, PC, or integrated home automation systems.
It functions either standalone on a local Wi-Fi network or integrates 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 from virtually anywhere.
Engineered for flexibility, the Shelly 2L Gen3 fits neatly into standard electrical wall boxes, can be discreetly installed behind light switches, or placed in space-constrained areas. Its built-in Web Interface allows intuitive monitoring, control, and fine-tuning of device settings.
This device is Matter-ready and supports this functionality via firmware update.
Main Features
- Perfect for Retrofitting! No neutral wire required. Power and control lights or other appliances using only a live wire.
- Dual Channels! Control two separate lights or devices independently.
- Low Minimum Load: Requires a Shelly Bypass 1L/2L Gen3 to be installed near the load (Channel 1), enabling control of bulbs over 5W.
- Wi-Fi Connectivity: Connects to your home Wi-Fi network for remote control via the Shelly mobile app or third-party platforms.
- Remote Control: Control connected devices from anywhere with an internet connection using the Shelly app on mobile or desktop.
- Voice Control: Compatible with Amazon Alexa and Google Assistant for hands-free operation via voice commands.
- Scheduling & Automation: Supports timers and custom routines—e.g., schedule lights to turn on/off at specific times.
- Compatibility:
- Designed and tested for compatibility with a wide range of lighting types.
- Operates across a broad voltage range: 220–240 VAC.
- Compact Design: Fits easily in standard wall boxes or behind switches, minimizing space usage.
- Overheating Protection: Equipped with an internal temperature sensor to prevent damage from excessive heat.
- Local & Remote Access: Control devices both locally (on the same network) and remotely (via the cloud).
- OTA Updates: Receives over-the-air firmware updates to improve performance, security, and features.
- Smart Home Ecosystem Integration: Compatible with MQTT, Home Assistant, and other major smart home platforms, enhancing versatility.
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
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
- Two switch/button inputs on screw terminals: S1 and S2
- One power supply input on screw terminal: L
Outputs
- One switch/button signal output on screw terminal: Sx
- Two relay outputs on screw terminals: O1 and O2
Connectivity
- Wi-Fi
- Bluetooth
Safety Function
- Overheating protection
Supported Load Types
Output 1:
- Incandescent lights
- LED lights
Note: Not compatible with low-voltage lights using step-down transformers
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: Performs factory reset.
Outputs
- Monochrome LED indicator:
- 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 Update in progress: 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: States are listed in order of priority. Higher-priority states override lower ones.
Specifications
| Quantity | Value |
|---|---|
| Physical | |
| Size (H×W×D) | 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 | 0.2 to 2.5 mm² / 24 to 14 AWG (solid, stranded, bootlace ferrules) |
| Conductor stripped length | 6 to 7 mm / 0.24 to 0.28 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 O1 load) |
| Shelly Bypass included | Yes |
| Power consumption | < 1.2 W |
| Neutral not needed | Yes (Shelly Bypass required for O1 load) |
| Min. load without neutral and without Bypass | Not applicable (Bypass required for O1; not needed for incandescent loads) |
| Output circuits ratings | |
| Max. switching voltage | 240 V~ |
| Max. switching power | |
| • Through O1 | 200 W |
| • Through 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 (indoor), up to 50 m / 160 ft (outdoor) (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 (indoor), up to 30 m / 100 ft (outdoor) (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 up to 5 URLs per hook |
| Scripting | Yes |
| MQTT | Yes |
Basic Wiring Diagram
Legend
| Terminals | 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
(Content pending)
Components and APIs
Compliance
- Shelly 2L Gen3 Multilingual EU Declaration of Conformity (2025-07-22)
- Shelly 2L Gen3 UK PSTI ACT Statement of Compliance
- Compliance Archive: Shelly 2L Gen3 EU Declaration of Conformity 83 09.04.02025
Printed User Guide
Installation Guides
(No guides available at this time)