Shelly 1L Gen3 WiFi Switch without Neutral Wire

With the Shelly 1L Gen3, you bring a smart switching solution into your home that even works without a neutral wire – ideal for older installations in Switzerland. This compact WiFi switch turns your conventional light switches and sockets into smart devices in no time. Thanks to the Gen3 platform, the 1L offers you even more security, reliability, and future-proofing. It can be directly integrated into existing installations and controlled via WiFi with the Shelly app, voice assistants, or automations. Particularly clever: Even push-buttons with pilot lamps or light bulbs with low load can be reliably switched thanks to the included bypass. The new Gen3 version comes with more memory, a faster processor, and better security features. Via the REST API and MQTT, you can flexibly integrate it into existing systems like Home Assistant. Scenarios such as time control, remote access, or local automations can also be easily implemented. The Shelly 1L Gen3 works completely without the cloud if you wish, thereby maintaining your privacy. Thanks to its compact design, it fits behind almost any light switch or into a flush-mounted box.

Features:

• Usable without a neutral wire: The Shelly 1L Gen3 also works in circuits without a neutral wire – perfect for old buildings and existing installations.
• With bypass for load optimization: Thanks to the included bypass, even LED lamps or consumers with low power consumption can be operated safely and stably.
• WiFi-enabled and usable without a hub: A connection to the local WiFi is sufficient – no central control unit required.
• App control and voice assistant integration: You can conveniently control the switch via the Shelly app or via Google Assistant and Alexa.
• Enhanced security and reliability: The Gen3 platform offers more memory and optimized security features.
• Local control without the cloud: Full functionality even without the internet – for a secure and private smart home.
• REST API and MQTT support: Easy integration into automation platforms like Node-RED, openHAB, or Home Assistant.
• Schedules and scenes: You can set up individual time controls or smart scenes – for automatic lighting when you come home.
• Compact design: Fits in almost any flush-mounted box and behind most light switches.
• High switching capacity: Up to 4.1 A at 240 V AC (without bypass), ideal for many household applications.

Application examples:

• Smart control of a living room lamp via app and voice.
• Integration into Home Assistant for automatic scenes at sunset.
• Switching a fan in the bathroom, even without a neutral wire.
• Time-controlled activation of hallway lighting in the evening.
• Upgrade conventional light switches in old buildings to smart control.

Documentation:

• Shelly Knowledge Base
• Shelly Forum English

Technical Data:

• Manufacturer: Allterco
• Manufacturer SKU: Shelly_1L_Gen3
• Physical Properties:
  • Maximum torque of terminal screws: 0.4 Nm
  • Wire cross-section: 0.2 to 2.5 mm² (solid, flexible, ferrules)
  • Wire stripping length: 6 to 7 mm
  • Installation: In-wall / Flush-mounted
  • Housing material: Plastic
  • Housing color: Cyan
  • Clamp color: Black
• Environmental conditions:
  • Operating temperature: -20 °C to +40 °C
  • Storage temperature: 10 °C to +40 °C
  • Humidity: 30% to 70% relative humidity
  • Maximum operating altitude: 2000 m above sea level
• Electrical Properties:
  • Power supply: 220–240 V~ 50 Hz
  • Power consumption: < 1.2 W
  • Neutral wire required: No (bypass required for consumers on output O)
  • Minimum load without neutral wire: The Shelly Bypass is mandatory for LED bulbs. Not required for incandescent bulbs.
  • External protection: 10 A circuit breaker with B or C tripping characteristic, 6 kA breaking capacity, energy limitation class 3
  • Bypass included: Yes
• Output Circuit:
  • Maximum switching voltage: 240 V~ 50 Hz
  • Maximum switching power: 200 W
• Sensor:
  • Internal temperature sensor: Yes
• Wireless connection:
  • WiFi protocol: 802.11 b/g/n
  • Frequency band (WiFi): 2401 – 2495 MHz
  • Maximum transmission power (WiFi): < 20 dBm
  • WiFi range: Up to 30 m indoors / up to 50 m outdoors (depending on the environment)
  • Bluetooth version: 4.2
  • Frequency band (Bluetooth): 2400 – 2483.5 MHz
  • Maximum transmission power (Bluetooth): < 4 dBm
  • Bluetooth range: Up to 10 m indoors / up to 30 m outdoors (depending on the environment)
• Processor and Memory:
  • Microcontroller: ESP-Shelly-C38F
  • Clock frequency: 160 MHz
  • RAM: 512 KB
  • Flash memory: 8 MB
• Firmware features:
  • Schedules: Up to 20
  • Webhooks (URL actions): Up to 20 with 5 URLs each
  • Scripting (custom automations): Yes
  • MQTT support: Yes
• Dimensions: 37 x 42 x 16mm
• Weight: 48g

Scope of delivery:

• 1x Shelly 1L Gen3 WiFi Switch
• 1x Shelly Bypass