The Shelly i4 Gen3 is the invisible brain that transforms your conventional wall switches into smart controls. Unlike a Shelly relay, the i4 does not directly power loads: its function is to read your interactions with your physical switches or buttons (single, double, triple, or long press) and translate them into actions for the rest of your smart home. Thanks to the Gen3 chip, latency is almost non-existent, so a double-click can turn off all the lights in the house or lower all the blinds at once. With its 4 independent inputs, you can centralize the control of lights, blinds, scenes, or an "away mode" in a single point, processed locally for greater speed and security.
Why choose the Shelly i4 Gen3?
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4 independent inputs: one button for lights, another for blinds, another for scenes…
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Scenes and multi-click: each input executes multiple actions (up to 16 different scenes).
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No construction work: reuse your current switches or buttons (also dry contact).
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Local processing: immediate response without relying on the cloud.
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No HUB or subscriptions: works on your 2.4 GHz WiFi network and Bluetooth.
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Integration: Shelly app, Home Assistant, Alexa (via virtual device), and HTTP/MQTT API.
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Matter-ready via firmware update.
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3-year manufacturer's warranty.
Key features
- WiFi and Bluetooth controller module with 4 inputs
- Does not include relay: reads switches/buttons and triggers automations
- Supports push button, switch, or dry contact
- Scenes, multi-click, and synchronized actions
- No HUB required
- Integration with HTTP API, MQTT(s), WebSockets, Webhooks, UDP, and mJS scripting
- Compatible with Home Assistant and Alexa (via virtual device)
- App for iOS and Android
Technical specifications
| Model |
S3SN-0024X |
| Flash |
8 MB |
| Power supply |
110 - 240 VAC, 50/60 Hz |
| Inputs |
4 (SW1-SW4) |
| Input type |
Push button, switch, or dry contact |
| Relay output |
No (input device) |
| Power metering |
No |
| Communication |
WiFi 2.4 GHz
Bluetooth 4.2 |
| Matter compatible |
Yes (via firmware) |
| BLE gateway |
Yes |
| WiFi range extender |
Yes |
| Scripting (mJS) |
Yes |
| MQTT |
Yes |
| Mounting |
Wall |
| Material |
Plastic |
| Working temperature |
-20°C to 40°C |
| Humidity |
30% to 70% RH |
| Range |
Up to 30 m indoors and 50 m outdoors |
| Dimensions |
37 x 42 x 16 mm |
| Weight |
19 g |
