The Shelly 2L Gen3 is a compact dual-channel smart relay designed for lighting control in installations without a neutral wire. It operates on 220–240V AC power and requires the included Shelly Bypass 1L/2L connected in parallel to the load for proper functionality in no-neutral setups.
The device supports Wi-Fi and Bluetooth connectivity, allowing for remote control via the Shelly app or integration with home automation systems such as Home Assistant. As it’s a Gen3 device, it can also be used as a Bluetooth gateway for Shelly BLU devices.
It is compatible with various smart home protocols, including MQTT, WebSocket, and Matter (via firmware update). The Shelly 2L Gen3 features an internal temperature sensor for overheating protection and is designed to fit into most standard electrical wall boxes or behind switches (please check dimensions before purchasing, as back/wall boxes vary in depth).
Different types of actions, scenarios, and schedules can be set to sync your environment to your daily activities or business needs, via the Shelly smart home ecosystem, including the Shelly Smart Control app – or link it with a popular home automation software such as Home Assistant via a Raspberry Pi!
Please research the device and your home wiring (safely, see below) before purchasing.
⚠️Caution – Read Before Buying⚠️
- Before beginning the installation, please read this guide and any other documents accompanying the device carefully and completely
- Danger of electrocution. The mounting/installation of the device should be performed by a qualified person (electrician)
- Failure to follow the installation procedures could lead to malfunction, danger to your health and life, violation of the law or refusal of legal and/or commercial guarantee (if any)
- Allterco Robotics (makers of Shelly products) and Mann Enterprises LTD are not responsible for any loss or damage in case of incorrect installation or improper operation of this device due to failure to follow the user and safety instructions in the printed guide accompanying this product (also available in the resources section below)
- Do not connect the device to appliances exceeding the given max load.
- Use the device only with a power grid and appliances which comply with all applicable regulations. Short circuit in the power grid or any appliance connected to the device may damage the device.
- Before starting, wire check that the breakers are turned off and there is no voltage on their terminals. This can be done with a phase meter or multimeter. When you are sure that there is no voltage, you can start wiring the cables.
Features
- Bluetooth, Wi-Fi
- 2-channel switch: Supports appliances:
- Up to 200W on output terminal 1
- Up to 700W on output terminal 2
- No Neutral wire required
- No minimum load required with Shelly Bypass for 1L/2L (included)
- Supports schedules, scenes and local actions
- Supports scripting, HTTPS, MQTTS, Inbound and Outbound Web Sockets
- Internal temperature sensor for overheating protection
- No hub required! Easy control through the Shelly Smart Control app, most platforms and protocols, as well as voice assistants. Use it with Alexa, Home Assistant, or your preferred automation platform.
- Wi-Fi range extender & Bluetooth gateway
Specifications
| Size (HxWxD) | 37x42x16 ±0.5 mm |
| Weight | 28g |
| Screw terminals max torque | 0.4 Nm / 3.5 lbin |
| Conductor cross-section | 0.2 to 2.5 mm² / 24 to 14 AWG (solid, stranded, and 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 |
| Ambient working temperature | -20 °C to 40 °C |
| Storage temperature | 10°C to 40 °C |
| Humidity | 30 % to 70 % RH |
| Max. altitude | 2000 m / 6562 ft |
| Power supply | 220-240 V~ 50Hz (Shelly Bypass is required for the load at O1) |
| Shelly Bypass included | Yes |
| Power consumption | < 1.2 W |
| Neutral not needed | Yes (Shelly Bypass is required for the load at O1) |
| Min. load without neutral and without a Bypass |
No (Shelly Bypass is required for the load at O1), for all LED lights. |
| No, Bypass is not needed for incandescent lights. | |
| Max. switching voltage | 240 V~ |
| Max. switching power | 200W through O1 |
| 700 W through O2 | |
| Internal-temperature sensor | Yes |
| Wi-Fi | |
| Protocol | 802.11 b/g/n |
| RF band | 2401 – 2495 МHz |
| Max. RF power | < 20 dBm |
| Range | Up to 30m indoors |
| Up to 50m outdoors | |
| (Depends on local conditions) | |
| Bluetooth | |
| Protocol | 4.2 |
| RF band | 2400 – 2483.5 MHz |
| Max. RF power | < 4 dBm |
| Range | Up to 10m indoors |
| Up to 30m outdoors | |
| (Depends on local conditions) | |
| Microcontroller unit | |
| CPU | ESP-Shelly-C38F |
| Clock frequency | 160 Mhz |
| RAM | 512 KB |
| Flash | 8 MB |
| Schedules | 20 |
| Webhooks (URL actions) | 20 with 5 URLs per hook |
| Scripting | Yes |
| MQTT | Yes |
Resources
- Shelly Product Documentation
- Printed User Guide (as found within the package)
- Components and APIs
- Declaration of Conformity
- Device Identification
- Device name: Shelly 2L Gen3
- Device model: S3SW-0A2X4EUL
- Device SSID: Shelly2LG3-XXXXXXXXXXXX
- Device Bluetooth ID: 0x1013
- EAN: 3800235261644
Handy Shelly Resources
- Shelly Cloud
- Shelly App
- Apple App Store
- Google Play
- Huawei AppGallery
- Home Assistant Shelly Integration
- Shelly Community Forum
- Shelly Facebook Support Group
- Shelly Knowledgebase
- Shelly Device Finder (easy-to-use software to find Shelly devices in the local network)
- Shelly Developer API
Package Contents
- 1x Shelly 2L Gen3
- 1x Shelly Bypass for 1L/2L
- 1x User guide
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