Shelly i4 Gen3

Device identification

Name: Shelly i4 Gen3

Model: S3SN-0024X

Device SSID: ShellyI4G3-XXXXXXXXXXXX

BLE Model ID: 0x1812

Short description

Shelly i4 Gen3 is a smart Wi-Fi switch input that lets you manually activate or deactivate scenes, trigger synchronized actions, or execute complex automation scenarios.
It can control other Shelly devices or third-party systems via HTTP or MQTT commands. Compact enough to fit behind standard wall switches,
Shelly i4 Gen3 supports four independent inputs and features upgraded processing power and memory for faster performance and expanded functionality.

Main features

• Wi-Fi connectivity for remote scene control and monitoring
• Bluetooth for fast device inclusion and BLE gateway capability
• Local and Cloud control options
• Improved processor and larger memory for better performance
• Embedded Web Interface for setup and management
• Acts as BLE Gateway – bridges Shelly BLU devices with Shelly Cloud or LAN devices
• Wi-Fi range extender for improved IoT connectivity
• Supports scripting and custom automation via Shelly Script
• Integrates with 3rd party systems via HTTP, MQTT(s), WebHooks, and UDP
• Virtual components for dynamic system configuration

Use cases

• Remote appliance and lighting control via mobile app or automation systems
• Manual activation or deactivation of complex scenes
• Trigger synchronized or chained actions for automation sequences
• Control other Shelly devices or third-party HTTP/MQTT-based systems
• Integrate wall switches into modern smart home ecosystems

Main applications

• Residential
• MDU (apartments, condominiums, hotels, etc.)
• Light commercial (offices, retail, restaurants, gas stations, etc.)
• Government / municipal buildings
• University / college facilities

Integrations

Amazon Alexa supported capabilities: Yes (via virtual device routine)

Google Smart Home supported traits: No

Samsung SmartThings supported capabilities: No

Device electrical interfaces

Inputs:

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

• 3 power supply inputs: 1 N and 2 L

Outputs:

• None

Add-on interface:

Shelly proprietary serial interface (⚠ High voltage when powered!)

Connectivity

Wi-Fi

Bluetooth

Safety function

Overheating protection

User interface

Inputs:

• One Control button

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

Press and hold for 10 seconds to factory reset the device.

Outputs:

LED (monocolor) indication

• AP enabled and Wi-Fi disabled: 1s ON / 1s OFF

• Wi-Fi enabled, not connected: 1s ON / 3s OFF

• Connected to Wi-Fi: Constantly ON

• Cloud enabled, not connected: 1s ON / 5s OFF

• Connected to Shelly Cloud: Constantly ON

• OTA update: ½s ON / ½s OFF

• Button held 5s: ½s ON / ½s OFF

• Button held 10s: ¼s ON / ¼s OFF

The LED behavior list starts with the lowest priority; higher priority states override the lower ones.

Physical

Size (HxWxD): 37×42×16 mm / 1.46×1.65×0.63 in

Weight: 19 g / 0.67 oz

Screw terminals torque: 0.4 Nm (3.5 lbf·in)

Conductor size: 0.2–2.5 mm² (24–14 AWG, solid, stranded, and bootlace ferrules)

Strip length: 6–7 mm (0.24–0.28 in)

Mounting: Wall box

Shell material: Plastic

Shell color: Orange

Terminal color: Black

Environmental

Ambient temperature: −20 °C to 40 °C (−5 °F to 105 °F)

Humidity: 30–70% 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 MHz

Max RF power: < 20 dBm

Range: Up to 30 m / 100 ft indoors; 50 m / 160 ft outdoors (depends on conditions)

Bluetooth protocol: 4.2 with BLE

Bluetooth RF band: 2400–2483.5 MHz

Bluetooth max RF power: < 4 dBm

Bluetooth range: Up to 10 m / 33 ft indoors; 30 m / 100 ft outdoors (depends on conditions)

MCU

CPU: ESP-Shelly-C38F

Flash: 8 MB

Firmware capabilities

Webhooks (URL actions): 20 with up to 5 URLs per hook

Scripting: Yes

MQTT: Yes