Shelly 2L Gen3 – Wi-Fi Smart Relay (No Neutral Required, 2 Channels)
Overview
Shelly 2L Gen3 is a compact dual-channel Wi-Fi smart relay designed for lighting control in installations without a neutral wire. It operates on 220–240 V AC and includes a Shelly Bypass for 1L/2L, required for stable operation on one of the outputs in no-neutral setups.
The device allows independent control of two lighting circuits and is ideal for retrofitting in existing electrical installations where only a live wire is present. As a Gen3 device, Shelly 2L Gen3 features the latest Shelly ESP processor, Bluetooth connectivity for fast onboarding, and the ability to act as a Bluetooth gateway for Shelly BLU devices.
It supports local and cloud control, advanced automations, and integrations with platforms such as Home Assistant, Alexa, and other supported systems.
Key Features
• Dual-channel Wi-Fi smart relay for no-neutral installations
• Designed for lighting control without a neutral wire
• Includes Shelly Bypass for 1L/2L (required for O1 output)
• Independent control of two lighting circuits
• Output ratings: up to 200 W on O1, up to 700 W on O2
• Wi-Fi and Bluetooth connectivity
• Gen3 ESP processor with 8 MB flash memory
• Can act as a Bluetooth gateway for Shelly BLU devices
• Supports schedules, scenes, and local actions
• Supports scripting (mJS), MQTT, WebSocket, HTTPS, and MQTTS
• Internal temperature sensor for overheating protection
• Wi-Fi range extender functionality
• No hub required – works with Shelly Smart Control app, Home Assistant, Alexa, and other platforms
• Matter-ready via future firmware update
Technical Specifications
Power & Switching
Power supply: 220–240 V AC, 50 Hz
Neutral required: No (Shelly Bypass required for load on O1)
Max switching voltage: 240 V AC
Max switching power:
• O1: 200 W
• O2: 700 W
Power consumption: < 1.2 W
Load & Channel Information
Channels: 2
Bypass requirement:
• O1: Shelly Bypass required (included)
• O2: Neutral not required
Connectivity – Wi-Fi
Protocol: 802.11 b/g/n (2.4 GHz)
RF band: 2401–2495 MHz
Range:
• Up to 30 m indoors
• Up to 50 m outdoors (depending on conditions)
Connectivity – Bluetooth
Protocol: Bluetooth 4.2
Range:
• Up to 10 m indoors
• Up to 30 m outdoors (depending on conditions)
Features
Internal temperature protection: Yes
Overload protection: No
Custom scripts (mJS): Yes
HTTP / HTTPS webhooks: Yes
Environmental
Operating temperature: -20°C to 40°C
Humidity: 30% to 70% RH
Physical
Dimensions (H × W × D): 37 × 42 × 16 mm
Mounting: In-wall (behind switch or in wall box)
Installation Notes
• Designed specifically for lighting circuits without a neutral wire
• Shelly Bypass must be installed in parallel with the load on O1
• Suitable for retrofit installations with limited space
• Fits most standard wall boxes, but depth should be checked before installation
• Installation must be carried out by a qualified electrician
• Do not exceed rated load limits
In the Box
• Shelly 2L Gen3
• Shelly Bypass for 1L/