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 Alexa: You can integrate the Shelly i4 Gen3 with Alexa. This enables voice control and automation capabilities through the platform.
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: https://shelly-api-docs.shelly.cloud/gen2/Scripts/ShellyScriptLanguageFeatures/
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: https://shelly-api-docs.shelly.cloud/gen2/DynamicComponents/Virtual/
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
Integrations
Amazon Alexa supported capabilities
Yes - through a virtual device routine
Google Smart Home supported traits
No
Samsung SmartThings supported capabilities
No
Simplified internal schematics
N/A for this device.
Device electrical interfaces
Inputs
4 switch/button inputs on screw terminal: SW1, SW2, SW3, and SW4
3 power supply inputs on screw terminals: 1 N and 2 L
Outputs
N/A
Add-on interface
Shelly proprietary serial interface
⚠CAUTION! High voltage on the add-on interface when the Device is powered!
Connectivity
Wi-Fi
Bluetooth
Safety function
Overheating protection
User interface
blu Inputs
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.
Outputs
LED (monocolor) indication
AP (Access Point) enabled and Wi-Fi disabled:
1 secondON/ 1 secondOFFWi-Fi enabled, but not connected to a Wi-Fi network:
1 secondON/ 3 secondsOFFConnected to a Wi-Fi network:
ConstantlyONCloud is enabled, but not connected:
1 secondON/5 secondsOFFConnected to Shelly Cloud:
ConstantlyONOTA (Over the Air Update):
½ secON/ ½ secondOFFButton pressed and held for 5 seconds:
½ secondON/ ½ secondOFFButton presses and held for 10 seconds:
¼ secondON/ ¼ secondOFF
The list above starts with the initial device status and the lowest priority. Every next state cancels the previous one.
Specifications
Quantity | Value |
|---|---|
Physical | |
Size (HxWxD): | 37x42x16 / 1.46x1.65x0.63 |
Weight: | 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 |
Mounting: | Wall box |
Shell material: | Plastic |
Shell color: | Orange |
Terminal Color | Black |
Environmental | |
Ambient working temperature: | -20 °C to 40 °C / -5 °F to 105 °F |
Humidity: | 30 % to 70 % RH |
Max. altitude: | 2000 m / 6562 ft |
Electrical | |
Power supply: | 110 - 240 V~ 50/60 Hz |
Power consumption: | < 1 W |
Sensors, meters | |
Internal-temperature sensor: | Yes |
Radio | |
Wi-Fi | |
Protocol: | 802.11 b/g/n |
RF band: | 2401 - 2483 МHz |
Max. RF power: | < 20 dBm |
Range: | Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors |
Bluetooth | |
Protocol: | 4.2 with BLE |
RF band: | 2400 - 2483.5 MHz |
Max. RF power: | < 4 dBm |
Range: | Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors |
Microcontroller unit | |
CPU: | ESP-Shelly-C38F |
Flash: | 8MB |
Firmware capabilities | |
Webhooks (URL actions): | 20 with 5 URLs per hook |
Scripting: | Yes |
MQTT: | Yes |
Basic wiring diagrams
 |  |
Legend
Terminals | Wires | ||
|---|---|---|---|
SW1, SW2, SW3, SW4 | Switch/button input terminals | L | Live wire (110-240 V~) |
L | Live terminal (110-240 V~) | N | Neutral wire |
N | Neutral terminal |
Shelly Smart Control
Shelly Web user interface
Components and APIs
Compliance
Shelly I4 Gen3 multilingual EU declaration of conformity 2025-07-22.pdf
Shelly i4 Gen3 AU NZ Certificate for Suitability.pdf
Shelly i4 Gen3 UK PSTI ACT Statement of compliance.pdf
Printed user guide
Shelly i4 Gen3 multilingual printed user and safety guide.pdf
