The Shelly 2L Gen3 is a compact, dual-circuit, Wi-Fi-based smart relay that offers an ideal solution for retrofitting and smartening lighting systems where no neutral wire is available in the wall outlet, only a phase wire. This is especially useful in older buildings where installing traditional smart relays can be challenging. The Shelly 2L Gen3 enables remote lighting control, setting schedules, and creating automation scenes without the need for a neutral wire.
The device is easy and quick to install, taking as little as 10 minutes. The Shelly 2L Gen3 is specifically designed to fit behind standard wall switches or other tight spaces, making it ideal for retrofit installations. With built-in Wi-Fi and Bluetooth connections, it easily integrates into existing smart home systems and enables remote access and control.
About the Shelly brand
Shelly is the brand of the Bulgarian company Shelly, known worldwide for its innovative and reliable smart home solutions. Thanks to their modular structure and open integration options, Shelly products are popular among both the DIY community and professional installers.
Main product features:
- Perfect for retrofit installation! No neutral wire needed. Lights or other devices can be powered and controlled with only a phase wire, without connecting the device to a neutral wire.
- Dual circuit The Shelly 2L Gen3 is suitable for switching and controlling two lighting circuits: with a maximum power of 200W and 700W respectively. Not suitable for shutter control!
- Supported load types:
Incandescent bulbs*
LED lighting*
*For light sources that do not use a step-down transformer (for low voltage lighting). - Minimum bulb power: A “Bypass 1L/2L Gen3” unit must be installed on the O1 output circuit next to the LED lamps, allowing control of bulbs above 5W. Not required for traditional incandescent bulbs.
- Wi-Fi connection: The Shelly 2L Gen3 connects to the home Wi-Fi network, enabling remote control through the Shelly mobile application or other smart home platforms.
- Remote control: With the Shelly app and internet connection, the connected device can be controlled from anywhere using a smartphone or tablet.
- Voice control: If connected to voice assistants such as Amazon Alexa or Google Assistant, it can be controlled using voice commands.
- Scheduling and automation: Shelly 2L Gen3 supports scheduling and automation, allowing you to create routine tasks and set timers, such as automatic switching on and off of lights at specified times.
- Compatibility Designed and tested to be compatible with various types of lighting. Operates in the 220–240 VAC voltage range.
- Compact design The Shelly 2L Gen3 is compact in size, making it easy to fit behind traditional chandelier switches or inside electrical boxes without taking up much space.
- Protection Internal temperature sensor for overheating protection.
- Local and remote access Devices can be controlled locally within the same Wi-Fi network or remotely when you’re not at home.
- OTA Updates Shelly devices regularly receive OTA (over-the-air) firmware updates to expand functionality and improve security.
- Smart home system compatibility
- The Shelly 2L Gen3 can be compatible with several smart home systems such as MQTT, Home Assistant, etc., making it a flexible solution for building a smart home.
- What’s new compared to the old Shelly 1L: Includes all new features of the latest Shelly devices:
- This new type can now control two lighting circuits.
- Scripting capabilities
- HTTPS and MQTTS support
- Inbound and outbound WebSocket support
Smart home protocols and platform compatibility
- Supported protocols: Wi-Fi (802.11 b/g/n), Bluetooth 4.2
- Bluetooth Gateway function: Capable of receiving and forwarding signals from Shelly BLE devices (remotes and sensors)
- Native platform: Shelly Smart Control App (Android, iOS)
- Cloud platform integrations: Amazon Alexa, Google Assistant
- Third-party platforms: Home Assistant, OpenHAB, Domoticz, ioBroker, Node-RED, MQTT, REST API, Webhook, HTTPS, UDP
- Voice control: Supports Amazon Alexa and Google Assistant
Smart features
- Remote switching on and off
- Remote status inquiry
- Set schedules and automations: up to 20 timers can be stored in the device’s memory.
- Create scenes with other Shelly devices
- Local and cloud-based operation
- Firmware update support
- Bluetooth Gateway function for BLE devices: can be remotely controlled via Shelly Bluetooth remotes and Bluetooth wireless wall switches
Electrical features
- Supply voltage: 220V–240V AC, 50/60Hz
- Maximum load: 200W (on the O1 output) + 700W (on the O2 output) @ 240V AC
- Switch input: One switch input per circuit for control, compatible with push-button and toggle switches. Not usable with intermediate or crossover switches.
- Voltage-free (dry contact) switching: Not supported
- Energy metering: Not supported
- Auto-off / Auto-on function: Supported
Other characteristics
- Size: Compact design, fits behind standard wall switches
- Installation: Easy and quick wall socket installation
- Bypass requirement: The included “Shelly Bypass 1L/2L Gen3” must be used for low power loads (under 5W)
- DIY compatibility: Open API and MQTT support, ideal for DIY projects
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