# Shelly Pro 3EM-400

*Shelly / SPEM-003CEBEU400*

> The Shelly Pro 3EM-400 is a DIN-rail three-phase energy meter for 400 A current transformers. It has Ethernet, Wi-Fi and Bluetooth, and contactor control needs a Pro add-on. It suits Home Assistant users through an integration (local Wi-Fi control).

- Canonical page: https://smarthomecanon.com/devices/shelly-pro-3em-400
- Last checked: 2026-10-14

## Key facts

| Fact | Value |
| --- | --- |
| Brand | [Shelly](https://smarthomecanon.com/brands/shelly) |
| Category | Energy meter |
| Model numbers | SPEM-003CEBEU400 |
| Status | Current[^1][^2] |
| Generation | Pro[^3] |
| Model code | SPEM-003CEBEU400[^4] |
| Measurement | Three-phase or single-phase, up to 400 A per phase[^4] |
| Current sensing | Current transformers, 400 A[^4] |
| Relay output | None; contactor control through a Shelly Pro add-on[^4] |
| Mounting | DIN rail[^4] |
| Radio | Ethernet, Wi-Fi, Bluetooth 4.2[^4] |
| Matter | unknown |
| Local API | HTTP API, MQTT and webhooks[^4][^5] |

## Integration paths

**How the Shelly Pro 3EM-400 connects**

| Path | Requires | Local | Features lost |
| --- | --- | --- | --- |
| [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 Pro 3EM-400**

| Path | Platform | Support | Integration |
| --- | --- | --- | --- |
| Wi-Fi local | [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) | withheld | Shelly |

## Related pages

- [Shelly energy meters](https://smarthomecanon.com/lines/shelly-energy-meters) (line)
- [Shelly](https://smarthomecanon.com/brands/shelly) (brand)
- [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)
- [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) (platform)

## Sources

[^1]: Shelly Pro 3EM-400 - Shelly Europe shop. https://www.shelly.com/products/shelly-pro-3em-400 (manufacturer, checked 2026-10-13)
[^2]: Shelly Europe shop catalog (Shopify product feed, pages 1-4). https://www.shelly.com/products.json?limit=250&page=1 (manufacturer, checked 2026-10-13)
[^3]: Shelly Pro devices - Shelly Knowledge Base. https://kb.shelly.cloud/knowledge-base/shelly-pro-devices (manufacturer, checked 2026-10-13)
[^4]: Shelly Pro 3EM-400 - Shelly Knowledge Base. https://kb.shelly.cloud/knowledge-base/shelly-pro-3em-400 (manufacturer, checked 2026-10-13)
[^5]: Shelly Technical Documentation. https://shelly-api-docs.shelly.cloud/ (manufacturer, checked 2026-10-13)