Shelly 1L Gen3 – Wi-Fi Smart Relay (No Neutral Required, 1 Channel)
Overview
Shelly 1L Gen3 is a compact single-channel Wi-Fi smart relay designed specifically for lighting control in installations without a neutral wire. It operates on 220–240 V AC and requires the included Shelly Bypass for 1L/2L, connected in parallel with the load, to ensure stable operation in no-neutral circuits.
As a Gen3 device, Shelly 1L Gen3 features the latest Shelly ESP processor with enhanced performance, 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 systems such as Home Assistant.
Key Features
• 1-channel Wi-Fi smart relay for no-neutral installations
• Designed for lighting circuits without a neutral wire
• Requires Shelly Bypass for 1L/2L (included) for LED loads
• Rated for lighting loads up to 200 W
• Wi-Fi and Bluetooth connectivity
• Gen3 ESP processor (ESP-Shelly-C38F) with 8 MB flash
• 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 with overheating protection
• Wi-Fi range extender and Bluetooth gateway functionality
• No hub required – works with Shelly Smart Control app, Home Assistant, Alexa, and other platforms
• Matter support planned via firmware update
Technical Specifications
Power & Switching
Power supply: 220–240 V AC, 50 Hz
Neutral required: No (Shelly Bypass required for LED loads)
Max switching voltage: 240 V AC
Max switching power: 200 W
Power consumption: < 1.2 W
Internal temperature sensor: Yes
Load Requirements
Minimum load without neutral:
• LED loads: Shelly Bypass required (included)
• Incandescent loads: Bypass not required
External Protection (recommended)
10 A, tripping characteristic B or C
6 kA interrupting rating
Energy limiting class 3
Connectivity – Wi-Fi
Protocol: 802.11 b/g/n (2.4 GHz)
RF band: 2401–2495 MHz
Max RF power: < 20 dBm
Range:
• Up to 30 m indoors
• Up to 50 m outdoors (depending on conditions)
Connectivity – Bluetooth
Protocol: Bluetooth 4.2
RF band: 2400–2483.5 MHz
Max RF power: < 4 dBm
Range:
• Up to 10 m indoors
• Up to 30 m outdoors (depending on conditions)
Processor & Software
CPU: ESP-Shelly-C38F
Clock frequency: 160 MHz
RAM: 512 KB
Flash memory: 8 MB
Schedules: Up to 20
Webhooks: 20 (with up to 5 URLs per hook)
Scripting (mJS): Yes
MQTT: Yes
Environmental
Operating temperature: -20°C to 40°C
Storage temperature: 10°C to 40°C
Humidity: 30% to 70% RH
Max altitude: 2000 m
Physical
Dimensions (H × W × D): 37 × 42 × 16 mm
Weight: 24 g
Mounting: In-wall (behind switch or in wall box)
Shell material: Plastic
Shell colour: Cyan
Wiring
Screw terminals max torque: 0.4 Nm / 3.5 lbin
Conductor cross-section: 0.2 to 2.5 mm² (24–14 AWG)
Conductor stripped length: 6–7 mm
Installation Notes
• Designed specifically for lighting circuits without a neutral wire
• Shelly Bypass must be installed in parallel with the load for LED lighting
• Not compatible with Shelly Wall Switches (slightly larger than standard Shelly modules)
• Fits most standard wall boxes, but depth should be checked before installation
• Installation must be performed by a qualified electrician
• Do not exceed rated load limits
In the Box
• Shelly 1L Gen3
• Shelly Bypass for 1L/2L
• User guide