Shelly i4 Gen3 4-Channel WiFi Smart Home Input Controller with Bluetooth
The Shelly i4 Gen3 is a smart Wi-Fi switch input controller that lets you take complete control of your smart home automation. This 4-channel digital input device allows you to manually activate or deactivate any created scene, run synchronized actions across multiple devices, or execute complex trigger scenarios - all without the need for a hub. Perfect for Australian homes upgrading to intelligent automation, the i4 Gen3 fits behind standard wall switches and integrates seamlessly with Amazon Alexa, Google Home, Home Assistant, and MQTT platforms.
Key Features
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4 Digital Inputs: Control up to four independent switches, buttons, sensors, or dry contacts for versatile automation
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Up to 16 Actions: Multi-click support enables single, double, triple, and long-press inputs for complex scene control
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Enhanced Gen3 Processor: Powered by ESP-Shelly-C38F chip with 8MB memory for faster response and improved reliability
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No Hub Required: Direct Wi-Fi (802.11 b/g/n 2.4GHz) and Bluetooth 4.2 connectivity
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Compact Design: Ultra-compact 37 × 42 × 16 mm size fits behind any wall switch or in electrical boxes
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Wide Voltage Support: Operates on 110-240V AC for Australian and global installations
Advanced Smart Home Integration
The Shelly i4 Gen3 is designed for seamless integration with your existing smart home ecosystem. Compatible with Home Assistant (local, no cloud required), Amazon Alexa, Google Home, MQTT, HTTP REST API, and custom mJS scripting. Control Shelly relays, sensors, and any HTTP or MQTT-controlled devices. Place it by your main entrance to switch all lights on or off throughout your home with a single button press, or activate your "Bedtime" scene to turn off all lights, lower blinds, and arm security - all in one smooth action.
Powerful Gen3 Technology
The third-generation Shelly i4 Gen3 features significant improvements over its predecessor, including an upgraded processor with doubled memory (8MB) compared to the Plus series. This ensures smoother and faster operation, improved device performance, and readiness for future Matter protocol upgrades. The device also functions as a BLE gateway and Wi-Fi range extender, enhancing connectivity across your smart home network with ranges up to 50m outdoors and 30m indoors.
Flexible Automation & Scripting
Create custom features and functionalities with full mJS scripting support. The Shelly i4 Gen3 supports webhooks, WebSocket, HTTPS, UDP, TLS, and custom certificates, making it ideal for advanced control logic and DIY home automation projects. Monitor and control remotely from anywhere via the free Shelly Smart Control app for iOS and Android, or use the embedded web interface for local configuration.
Easy Retrofit Installation
Installation takes less than 10 minutes. The ultra-compact design fits into standard electrical wall boxes, behind power sockets, light switches, or in tight spaces. Works perfectly with Shelly Wall Switches for a complete physical control solution. Compatible with solid, stranded, and crimp terminals (0.2 to 2.5 mm² / 24 to 14 AWG).
Universal Connectivity
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Wi-Fi: 802.11 b/g/n (2.4 GHz), up to 50m outdoors / 30m indoors
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Bluetooth: BLE 4.2, up to 30m outdoors / 10m indoors
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4 Switch/Button Inputs: SW1, SW2, SW3, SW4 on screw terminals
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Power Supply Inputs: 1 N and 2 L terminals
What's in the Box
- Shelly i4 Gen3 controller
- Quick start guide
Full Specifications
Power
| Power Supply |
110-240 V AC ±10%, 50/60 Hz |
| Device Power Consumption |
< 1 W |
Inputs & Control
| Channels |
4 digital inputs |
| Multi-Click Support |
Up to 16 possible actions |
| Custom Scripts |
mJS scripting supported |
| Device Temperature Protection |
Yes |
Connectivity
| Wi-Fi Protocol |
802.11 b/g/n (2.4 GHz) |
| Wi-Fi Range |
Up to 50 m outdoors, up to 30 m indoors |
| Bluetooth Protocol |
BLE 4.2 |
| Bluetooth Range |
Up to 30 m outdoors, up to 10 m indoors |
| BLE Gateway |
Yes |
Processor
| CPU |
ESP-Shelly-C38F |
| Flash Memory |
8 MB |
| Matter Upgradeable |
Yes |
Integrations
| Platforms |
Home Assistant, Amazon Alexa, Google Home |
| Protocols |
MQTT, HTTP REST API, WebSockets, Webhooks |
| Cloud Control |
Local and cloud operation supported |
| Webhooks |
20 total; up to 5 URLs per hook |
Environmental
| Operating Temperature |
-20°C to 40°C |
Physical
| Dimensions (H × W × D) |
37 × 42 × 16 mm |
| Weight |
19 g |
| Conductor Cross Section |
0.2 to 2.5 mm² / 24 to 14 AWG |
| Maximum Screw Terminal Torque |
0.4 Nm / 3.5 lbin |
Warranty
| Manufacturer Warranty |
3 years |
Specifications are sourced from the manufacturer product page and may be updated.
