Wi-Fi controlled controller with four digital inputs
The Shelly i4 Gen3 can manage four digital inputs, allowing you to manually activate or deactivate any created scene, synchronize actions, or execute complex trigger scenarios. You can activate various devices and control lighting, close blinds, and instantly activate scenes from one place. Compact enough to fit behind most wall switches, the Shelly i4 Gen3 is retrofittable and requires less than ten minutes for installation under a standard 4-button switch.
- Multi-click - Up to 16 actions possible
- New processor - ESP-Shelly-C38F chip with increased 8 MB memory
- Improved durability of the connectors
- Supports scripting, webhooks, MQTT, WebSocket, HTTPS, UDP, TLS, and custom certificates
- No HUB required! Easy control via the Shelly Smart Control App, various home automation protocols, and platforms
*The Shelly i4 Gen3 is an input reading device (it does not contain a relay).
WHY SHELLY I4 GEN3?
Full control at your switch
The Shelly i4 Gen3 is a smart device that allows you to easily control various devices and scenes in your home. When placed behind a switch, you can instantly set the mood for a movie night or conveniently turn off all the lights in the house from one place. Equipped with our own Shelly chip, it is now even more powerful, executes commands quickly, and sends notifications for various actions. Use the Shelly i4 Gen3 to control other Shelly relays, sensors, or devices controlled via HTTP and MQTT. Compact enough to fit behind any wall switch, the Shelly i4 Gen3 can display status and control actions for up to four inputs.
Features
Wi-Fi powered
Connect the Shelly i4 Gen3 to your Wi-Fi network. No HUB required!
Bluetooth
Add devices quickly and easily via the Bluetooth connection or use it as a Bluetooth gateway.
Wide range of voltage support
The Shelly i4 Gen3 can be powered with 110-240 V AC
can be powered.
Multi-click support
Up to 16 actions possible. Control any desired Shelly device and any scene.
Smart scenes
Combine the Shelly i4 Gen3 with other Shelly devices and create custom scenes.
Scripting
The Shelly i4 Gen3 fully supports mjS scripting, allowing you to create custom functions and features.
Features of the Gen3 series

On the way to Matter
Every Gen3 device is designed to be upgradable to Matter. The doubled memory compared to the Plus series ensures a smooth update process and paves the way for new smart features and integrations.
*Depending on the level of support for Matter features.
More memory, more performance
The Gen3 series ensures the quality and reliability of our devices by using our powerful Shelly chip. With an impressive 8 MB of memory, the device's performance and efficiency are greatly improved. This significant memory increase not only guarantees smoother and faster operation but also equips the Gen3 series for the introduction of new features.

Unified control with virtual components
The Gen3 series introduces "virtual components" that change the management and control of third-party devices. Within the Shelly Smart Control App, you can now create virtual devices to integrate non-Shelly products into a unified control system. This feature enables efficient control of all your smart devices, regardless of brand, through a single user interface.

Technical data
| PHYSICAL | |
|---|---|
| Size (H x W x D): | 37x42x17 mm / 1.46x1.65x0.66 inch |
| Weight: | 18 g |
| Screw terminal max. torque: | 0.4 Nm / 3.5 lbin |
| Conductor cross-section: | 0.2 to 2.5 mm² / |
| 24 TO 14 AWG (solid, stranded, and ferrules) | |
| Stripping length of conductor: | 6 to 7 mm / 0.24 to 0.28 inch |
| Mounting: | Flush-mounted box |
| Housing material: | Plastic |
| ENVIRONMENT | |
| Ambient temperature: | -20°C to 40°C |
| Humidity: | 30% to 70% relative humidity |
| Max. altitude above sea level: | 2000 m |
| ELECTRICAL | |
| Power supply: | 110 - 240 V~ 50/60 Hz |
| Device power consumption: | < 1 W |
| SENSORS, MEASURING DEVICES | |
| Internal temperature sensor: | Yes |
| RADIO | |
| WLAN | |
| Protocol: | 02.11 b/g/n |
| RF band: | 2401 - 2483 MHz |
| Max. RF power: | < 20 dBm |
| Range: | Up to 50 m outdoors, up to 30 m indoors (depending on local conditions) |
| BLUETOOTH | |
| Protocol: | 4.2 |
| RF band: | 2400 - 2483.5 MHz |
| Max. RF power: | < 4 dBm |
| Range: | Up to 30 m outdoors, up to 10 m indoors (depending on local conditions) |
| MICROCONTROLLER UNIT | |
| CPU: | ESP-Shelly-C38F |
| Flash: | 8 MB |
| FIRMWARE FEATURES | |
| WebHooks (URL actions): | 20 with five URLs per hook |
| Scripting: | Yes |
| MQTT: | Yes |
| Encryption: | Yes |