Skip to main content
Skip table of contents

Shelly i4 Gen3

i4 Gen3-0.jpeg

Device identification

  • Device name: Shelly i4 Gen3

  • Device model: S3SN-0024X

  • Device SSID: ShellyI4G3-XXXXXXXXXXXX

  • BLE Model ID: 0x1812

Short description

Shelly i4 Gen3 is a smart Wi-Fi switch input that allows you to manually activate or deactivate any created scene, run synchronized actions, or execute complex trigger scenarios. You can use Shelly i4 Gen3 to control other connected Shelly switches, sensors, or HTTP and MQTT-controlled devices. Small enough to fit behind every wall switch, Shelly i4 Gen3 can show the status and control the action of four inputs. The device also has improved processor and increased memory compared to its predecessor.

You can access and monitor Shelly i4 Gen3 remotely from any place where you have internet connectivity, if the Device is connected to a Wi-Fi router and the Internet.

You can retrofit the Device into standard electrical wall boxes, behind power sockets, light switches, or into other places with limited space.

Shelly i4 Gen3 has an embedded Web Interface that you can use to control it and set it up.

Main features

  • Wi-Fi Connectivity: The device can connect to your home Wi-Fi network, allowing you to remotely monitor humidity and temperature data through a smartphone app or other compatible devices.

  • Integration with Smart Home Platforms: You can integrate the Shelly i4 Gen3 with popular smart home platforms, including Google, Alexa, and Samsung SmartThings. This enables voice control and automation capabilities through these platforms.

  • Local and Cloud Control: Can function independently in a local Wi-Fi network and can also be operated through cloud home automation services.

  • Bluetooth Connectivity: Bluetooth and BLE gateway are available for inclusion purposes, which may be useful during the setup process.

  • User-Friendly Interface: The device provides a user-friendly interface with a reset button for manual interactions.

  • Improved Processor and Memory: Upgraded with an improved processor and increased memory for enhanced performance.

  • Embedded Web Interface: Features an embedded web interface for monitoring, control, and adjustment of settings.

  • Wireless Connectivity: The device supports Wi-Fi (802.11 b/g/n) and Bluetooth 4.2 protocols with specified indoor and outdoor range capabilities.

  • BLE Gateway: Bridge between your Shelly BLU devices and the wider Shelly ecosystem. It receives Bluetooth signals and sends them to the cloud or locally to another non-bluetooth device.

  • Wi-Fi Range extender for IoT devices: A Wi-Fi extender is employed to expand the reach of your Wi-Fi network by receiving your current Wi-Fi signal, enhancing its strength, and then transmitting the enhanced signal over a wider area.

  • Scripting:

  • Wide range of integrations: The device can be integrated with 3rd party home systems, documented HTTP API, MQTT(s), Web Hooks over HTTP and HTTPS, UDP

  • Virtual Components:

Use cases

  • Remote Appliance Control: Turn on or off electric appliances remotely using your mobile phone, tablet, PC, or home automation system.

  • Internet-Connected Convenience: Access аnd control devices from anywhere with internet connectivity, as long as the Shelly i4 Gen3 is connected to a Wi-Fi router. 

  • Home Automation: Shelly i4 Gen3 enables automatic control of power appliances for more relaxing and enjoyable experience.

Main applications

  • Residential

  • MDU (Multi Dwelling Units - apartments, condominiums, hotels, etc.)

  • Light commercial (small office buildings, small retail/restaurant/gas station, etc.)

  • Government/municipal

  • University/college


Amazon Alexa supported capabilities

Yes - through a virtual device routine

Google Smart Home supported traits


Samsung SmartThings supported capabilities


Simplified internal schematics

N/A for this device.

Device electrical interfaces


  • 4 switch/button inputs on screw terminal: SW1, SW2, SW3, and SW4

  • 3 power supply inputs on screw terminals: 1 N and 2 L



Add-on interface

  • Shelly proprietary serial interface

Shelly Plus 1 addon interface

⚠CAUTION! High voltage on the add-on interface when the Device is powered!


  • Wi-Fi

  • Ethernet

  • Bluetooth

Safety function

  • Overheating protection

User interface


  • One (Control) button

    • Press and hold for 5 seconds to enable Device access point and Bluetooth connection.

    • Press and hold for 10 seconds to factory reset the Device.


  • LED (monocolor) indication

    • AP (Access Point) enabled and Wi-Fi disabled:
      1 second ON / 1 second OFF

    • Wi-Fi enabled, but not connected to a Wi-Fi network:
      1 second ON / 3 seconds OFF

    • Connected to a Wi-Fi network:
      Constantly ON

    • Cloud is enabled, but not connected:
      1 second ON /5 seconds OFF

    • Connected to Shelly Cloud:
      Constantly ON

    • OTA (Over the Air Update):
      ½ sec ON / ½ second OFF

    • Button pressed and held for 5 seconds:
      ½ second ON / ½ second OFF

    • Button presses and held for 10 seconds:
      ¼ second ON / ¼ second OFF

The list above starts with the initial device status and the lowest priority. Every next state cancels the previous one.





Size (HxWxD):

37x42x16 / 1.46x1.65x0.63


19 g / 0.67 oz

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


Wall box

Shell material:


Shell color:


Terminal Color



Ambient working temperature:

-20 °C to 40 °C / -5 °F to 105 °F


30 % to 70 % RH

Max. altitude:

2000 m / 6562 ft


Power supply:

110 - 240 V⎓, 50/60 Hz

Power consumption:

< 1 W

Sensors, meters

Internal-temperature sensor:





802.11 b/g/n

RF band:

2401 - 2483 МHz

Max. RF power:

< 20 dBm


Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors
(Depends on local conditions)



4.2 with BLE

RF band:

2400 - 2483.5 MHz

Max. RF power:

< 4 dBm


Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors
(Depends on local conditions)

Microcontroller unit





Firmware capabilities

Webhooks (URL actions):

20 with 5 URLs per hook





Basic wiring diagrams

i4 Gen3-20240528-133422.png

i4 DC Gen3 with buttons AC symbol.png




SW1, SW2, SW3, SW4

Switch/button input terminals


Live wire (110-240 V~)


Live terminal (110-240 V~)


Neutral wire


Neutral terminal

Components and APIs


Shelly i4 Gen3 multilingual EU declaration of conformity.pdf

Printed user guide

Shelly i4 Gen3 multilingual printed user and safety guide.pdf

Installation guides

JavaScript errors detected

Please note, these errors can depend on your browser setup.

If this problem persists, please contact our support.