# Shelly 1L Gen4

*Shelly / S4SW-0A1X1EUL*

> The Shelly 1L Gen4 is the Gen4 choice for older light switches, because it needs no neutral wire. It comes set up for Matter, with Zigbee as the alternative. It suits HomeKit users, with native support through Matter over Wi-Fi. Home Assistant users get native support through Zigbee. Google Home, Alexa and SmartThings users reach it through an integration (the maker's cloud).

- Canonical page: https://smarthomecanon.com/devices/shelly-1l-gen4
- Last checked: 2026-10-20

## Key facts

| Fact | Value |
| --- | --- |
| Brand | [Shelly](https://smarthomecanon.com/brands/shelly) |
| Category | Relay module |
| Model numbers | S4SW-0A1X1EUL |
| Status | Current[^1][^2] |
| Generation | Gen4[^3] |
| Model code | S4SW-0A1X1EUL[^4] |
| Power measurement | Internal temperature only[^4] |
| Neutral wire | No neutral needed (Shelly Bypass included)[^4] |
| Max load | 200 W at 240 V~[^4] |
| Mounting | In-wall[^4] |
| Radio | Wi-Fi (802.11 b/g/n), Bluetooth 4.2, Zigbee[^4] |
| Matter | Built in (default). Zigbee is the alternate profile.[^4] |
| Local API | HTTP API, MQTT and webhooks[^4][^5] |

## Integration paths

**How the Shelly 1L Gen4 connects**

| Path | Requires | Local | Features lost |
| --- | --- | --- | --- |
| [Matter / Wi-Fi](https://smarthomecanon.com/protocols/matter-wifi) | Matter controller[^4] | unknown | unknown |
| [Zigbee](https://smarthomecanon.com/protocols/zigbee) | Zigbee coordinator[^4] | unknown | unknown |
| [Wi-Fi local](https://smarthomecanon.com/protocols/wifi-local) | withheld | withheld | unknown |
| [Wi-Fi cloud](https://smarthomecanon.com/protocols/wifi-cloud) | Vendor cloud account[^4] | No[^4] | unknown |

**Platform support for the Shelly 1L Gen4**

| Path | Platform | Support | Integration |
| --- | --- | --- | --- |
| Matter / Wi-Fi | [HomeKit](https://smarthomecanon.com/platforms/homekit) | Native[^6] |  |
| Zigbee | [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) | withheld | zigbee2mqtt |
| Wi-Fi local | [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) | withheld | Shelly |
| Wi-Fi local | [Homey](https://smarthomecanon.com/platforms/homey) | withheld | cloud.shelly.control |
| Wi-Fi cloud | [Amazon Alexa](https://smarthomecanon.com/platforms/alexa) | Via integration[^4] |  |
| Wi-Fi cloud | [Google Home](https://smarthomecanon.com/platforms/google-home) | Via integration[^4] |  |
| Wi-Fi cloud | [Samsung SmartThings](https://smarthomecanon.com/platforms/smartthings) | Via integration[^4] |  |

## Related pages

- [Shelly relays by generation](https://smarthomecanon.com/lines/shelly-relays) (line)
- [Shelly](https://smarthomecanon.com/brands/shelly) (brand)
- [Matter over Wi-Fi](https://smarthomecanon.com/protocols/matter-wifi) (protocol)
- [Zigbee](https://smarthomecanon.com/protocols/zigbee) (protocol)
- [Wi-Fi with local control](https://smarthomecanon.com/protocols/wifi-local) (protocol)
- [Wi-Fi through a cloud service](https://smarthomecanon.com/protocols/wifi-cloud) (protocol)
- [HomeKit](https://smarthomecanon.com/platforms/homekit) (platform)
- [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) (platform)
- [Homey](https://smarthomecanon.com/platforms/homey) (platform)
- [Amazon Alexa](https://smarthomecanon.com/platforms/alexa) (platform)
- [Google Home](https://smarthomecanon.com/platforms/google-home) (platform)
- [Samsung SmartThings](https://smarthomecanon.com/platforms/smartthings) (platform)

## Sources

[^1]: Shelly 1L Gen4 - Shelly Europe shop. https://www.shelly.com/products/shelly-1l-gen4 (manufacturer, checked 2026-10-09)
[^2]: Shelly Europe shop catalog (Shopify product feed, pages 1-3). https://www.shelly.com/products.json?limit=250&page=1 (manufacturer, checked 2026-10-09)
[^3]: Shelly Gen4 devices - Shelly Knowledge Base. https://kb.shelly.cloud/knowledge-base/shelly-gen4-devices (manufacturer, checked 2026-10-09)
[^4]: Shelly 1L Gen4 - Shelly Knowledge Base. https://kb.shelly.cloud/knowledge-base/shelly-1l-gen4 (manufacturer, checked 2026-10-09)
[^5]: Shelly Technical Documentation. https://shelly-api-docs.shelly.cloud/ (manufacturer, checked 2026-10-09)
[^6]: Shelly Group introduces multiprotocol connectivity at CES 2025 (2025-01-06). https://www.shelly.com/blogs/media-kit/shelly-group-introduces-multiprotocol-connectivity-at-ces-2025 (manufacturer, checked 2026-10-09)