Shelly 2L Gen3 – Dual-Channel Wi-Fi Smart Relay (No Neutral Required)
Overview
Shelly 2L Gen3 is a compact, Wi-Fi operated dual-channel smart relay designed for lighting control in installations where no neutral wire is available. Powered directly from the live wire and supplied with a Shelly Bypass, it enables reliable smart control in retrofit scenarios, including older properties.
The device supports remote control, scheduling, scripting, and voice assistants, and fits behind standard wall switches or inside electrical boxes.
Key Features
• No neutral wire required (Shelly Bypass included for O1)
• Dual-channel relay output
• Wi-Fi operated – no hub required
• Bluetooth for quick pairing and gateway functionality
• Compact design for installation behind wall switches
• Supports schedules, sunrise/sunset automation
• Local scripting support (mJS)
• Internal temperature protection
• Over-the-air firmware updates
• Compatible with Alexa and Google Assistant
• Matter-ready (via future firmware updates)
Technical Specifications
Power
• Supply: AC 220–240 V ~ 50 Hz
• Max switching voltage: 240 V ~ 50 Hz
• Max switching power:
– O1: 200 W (bypass required)
– O2: 700 W
• Power consumption: < 1.2 W
• Neutral required: No (bypass required on O1)
Connectivity
• Wi-Fi: 802.11 b/g/n
• Wi-Fi frequency: 2401–2495 MHz
• Wi-Fi range:
– Up to 50 m outdoors
– Up to 30 m indoors
• Bluetooth: 4.2
• Bluetooth range:
– Up to 30 m outdoors
– Up to 10 m indoors
Features
• Device temperature protection: Yes
• Overload protection: No
• HTTP/HTTPS webhooks: Yes
• Custom scripting (mJS): Yes
• Channels: 2
Environmental
• Operating temperature: –20 °C to +40 °C
• Humidity: 30–70% RH
Dimensions
• 37 × 42 × 16 mm
Installation / Application Notes
• Designed for lighting circuits without a neutral wire
• Shelly Bypass must be installed on output O1
• Suitable for retrofit installations and shallow wall boxes
• Install behind existing wall switches or inside junction boxes
• Requires basic electrical knowledge; installation should comply with local electrical regulations
In the Box
• Shelly 2L Gen3 smart relay
• Shelly Bypass
• Quick start documentation