The Shelly Pro 3EM-400 is a DIN-rail energy meter for three-phase monitoring with included 400 A current transformers. It fits homes, workshops, and light commercial panels that need more current headroom than the standard 120 A version while still wanting Shelly's local-first automation approach.
Shelly's current official source set positions it for photovoltaic-aware monitoring, import and export visibility, and local integrations through the embedded web interface plus MQTT, HTTP, WebSocket, Modbus, and Home Assistant-friendly workflows. That makes it a strong fit when you want high-current CT monitoring without giving up local access or depending on a cloud-only setup.
This is a better match for structured monitoring and automation than for buyers who only want a simple app-first clamp monitor. It is also not a utility-grade revenue meter. Its value is the combination of higher-current CT coverage, three-phase visibility, and stronger local integration flexibility.