Shelly Pro 3EM-400A

Shelly Pro 3EM-400A — WiFi and Ethernet 3-Phase Meter up to 400A

The Shelly Pro 3EM-400A (model SPEM-003CEBEU400) is a professional DIN rail mount three-phase energy meter with Gen2 firmware. Designed for high-power installations with measurement up to 400A per phase using included current clamps. Compatible with Home Assistant, Alexa, and Google Home without a hub or subscriptions.

Technical Specifications — Shelly Pro 3EM-400A

• Model: SPEM-003CEBEU400
• Connectivity: WiFi 802.11 b/g/n (2.4 GHz) + Ethernet (RJ45) + Bluetooth BLE 4.2
• Power Supply: 110–240V AC, 50/60 Hz
• Maximum Current: 3 × 400A (current clamps included)
• Measurement Channels: 3 (three-phase)
• Accuracy: Class B (IEC 62053-21)
• Measurement: Voltage, current, active/reactive/apparent power, power factor, accumulated energy — bidirectional
• Storage: 60 days at 1-minute intervals (non-volatile memory)
• Indicator: Optical pulse for visual consumption tracking
• Mounting: DIN rail
• Certifications: CE, RoHS
• Protocols: MQTT, HTTP REST API, WebSockets, Webhooks, Scripting (mJS), Modbus TCP

Main Features

• Measurement up to 400A per phase — ideal for industrial and commercial installations
• High-capacity current clamps included — no wire cutting required
• Bidirectional measurement: consumed and produced energy
• Phase sequence inversion detection
• Optical pulse indicator for visual consumption control
• 60 days of data storage at 1-minute resolution
• Dual connectivity: WiFi + Ethernet RJ45 for professional environments
• Compatible with photovoltaic installations and self-consumption systems

Compatible with

• Home Assistant (local, no cloud)
• Amazon Alexa
• Google Home
• MQTT, HTTP REST API, Scripting mJS, Modbus TCP

Use Cases

• Consumption monitoring in high-power industrial installations
• Energy control in substations and electrical distribution centers
• Monitoring of large-scale photovoltaic installations
• Professional energy management in buildings and industrial warehouses
• Integration into BMS and building management systems

Official Shelly distribution. Shipping from Spain. Official Shelly warranty.