Shelly Pro 3EM is a three‑phase energy meter with Wi‑Fi for whole‑home or sub‑panel monitoring. It provides per‑phase and total measurements for voltage, current, active/reactive power, power factor, and energy. Data is available locally via REST/HTTP, CoAP/CoIoT, and MQTT—no hub or cloud required. Designed for DIN‑rail installations, it integrates cleanly with Home Assistant for real‑time dashboards and automations.

Highlights

• Three‑phase energy monitoring (also works with single‑phase setups)
• Local API (HTTP/CoIoT) and MQTT; Shelly Cloud optional
• Wi‑Fi 2.4 GHz; no hub required
• DIN‑rail form factor for electrical panels
• Works with Home Assistant via the official Shelly integration

Home Assistant experience

• Auto‑discovered on your network; entities for per‑phase power, voltage, current, and energy
• 100% local operation; the cloud is optional for remote access and backups