Shelly 1L Gen3
Device Identification
- Device name: Shelly 1L Gen3
- Device model: S3SW-0A1X1EUL
- Device SSID: Shelly1LG3-XXXXXXXXXXXX
- Device Bluetooth ID: 0x1014
Short Description
The Shelly 1L Gen3 is a compact smart switch designed for lighting control. A standout feature is that it does not require a neutral wire to operate — however, it must be used in parallel with a Shelly Bypass 1L/2L Gen3 connected to the load. You can conveniently manage your lighting via mobile phone, tablet, PC, or home automation systems.
The device functions either standalone on a local Wi-Fi network or integrates with cloud-based home automation services. As long as the Shelly 1L Gen3 is connected to a Wi-Fi router and the internet, users can access, control, and monitor it remotely from anywhere.
Designed for space efficiency, the Shelly 1L Gen3 fits snugly into standard electrical wall boxes, behind light switches, or in tight spaces. It includes an embedded Web Interface for easy monitoring, control, and fine-tuning of device settings.
✅ This device is Matter-ready — functionality can be enabled via firmware update.
Main Features
- Perfect to retrofit! No neutral wire required. Power and control via live wire only.
- Minimum bulb wattage support: With the Shelly Bypass 1L/2L Gen3 installed, it supports bulbs over 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 from anywhere with an internet connection using the Shelly app (mobile/tablet).
- Voice Control: Compatible with Amazon Alexa and Google Assistant for voice commands.
- Scheduling & Automation: Set timers and create routines (e.g., lights turning on/off at specific times).
- Compatibility:
- Works with a wide range of lighting types.
- Supports voltages from 220–240 VAC.
- Compact Design: Fits easily in standard electrical boxes or behind switches.
- Overheating Protection: Internal temperature sensor ensures safe operation.
- Local & Remote Access: Control both locally (same Wi-Fi) and remotely (over internet).
- OTA Updates: Receives over-the-air firmware updates for improved features and security.
- Smart Home Ecosystems: Compatible with MQTT, Home Assistant, and more.
- New Features vs. Old Shelly 1L: Scripting support, HTTPS, MQTTS, inbound/outbound WebSockets.
Main Applications
- Residential
- MDU (Multi Dwelling Units – apartments, condos, 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
- 1 switch/button input on screw terminal: S
- 1 power supply input on screw terminal: L
Outputs
- 1 switch/button signal output on screw terminal: Sx
- 1 relay output on screw terminal: O
Connectivity
- Wi-Fi
- Bluetooth
Safety Function
- Overheating protection
Supported Load Types
- Incandescent lights*
- LED lights*
*Excludes lower-voltage lights without step-down transformers
User Interface
Inputs
- One (Control) button:
- Press and hold for 5 seconds: Enables Device Access Point and Bluetooth.
- 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 Update in progress: ½ sec ON / ½ sec OFF
- Button held for 5 sec: ½ sec ON / ½ sec OFF
- Button held for 10 sec: ¼ sec ON / ¼ sec OFF
⚠️ The list starts with initial status and lowest priority. Each subsequent state overrides 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 | 24 g / 0.85 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 0.28 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~ 50Hz (Shelly Bypass required) |
| Shelly Bypass included | Yes |
| Power consumption | < 1.2 W |
| Neutral not needed | Yes (Shelly Bypass required for load at O) |
| Min. load without neutral and without Bypass | No (Bypass required for all LED lights); Bypass not needed for incandescent lights |
| External protection | 10 A, tripping characteristic B or C, 6 kA interrupting rating, Energy limiting class 3 |
| Output circuits ratings | |
| Max. switching voltage | 240 V~ 50 Hz |
| Max. switching power | 200 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 |
|---|---|---|---|
| L | Live (220–240 V~) terminal | L | Live (220–240 V~) wire |
| O | Load circuit output terminal | N | Neutral wire |
| S1, S2 | Switch input terminals | ||
| Sx | Switch signal output terminal |
Shelly Smart Control
Troubleshooting
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Components and APIs
Compliance and Certification
- Shelly 1L Gen3 multilingual EU Declaration of Conformity (2025-07-22)
- Shelly 1L Gen3 UK PSTI ACT Statement of Compliance
Compliance archive
Printed User Guide
Additional Language Version:
Installation Guides
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