Shelly Pro 3EM-400A DIN-rail Energy Meter

The Shelly Pro 3EM 400A represents a sophisticated three-phase energy monitoring solution designed for professional electrical installations. As part of the Shelly Pro series, this microprocessor-managed device enables comprehensive remote monitoring and control of electrical circuits through mobile applications, web interfaces, or home automation systems. Engineered for reliability and precision, it serves as an advanced tool for energy management in commercial, industrial, and residential settings where accurate three-phase power measurement is essential.

This professional-grade energy meter combines robust construction with intelligent features, offering both local Wi-Fi network operation and cloud-based management capabilities. The device's DIN rail mounting design facilitates neat installation within electrical distribution boards, making it particularly suitable for new construction projects and facility upgrades. With its ability to communicate through multiple protocols including Wi-Fi, LAN, and Bluetooth for device inclusion, the Shelly Pro 3EM 400A provides flexible integration options for modern building automation systems while maintaining standalone operational capability.

Technical Specifications

• Electrical Input: 3P+N, 3x230/400V AC
• Maximum Current: 400A per phase (using external current transformers)
• Measurement Accuracy: Class 1 (active energy) according to EN 50470-1
• Frequency Range: 50/60 Hz ± 5%
• Power Consumption: ≤ 2W, ≤ 10VA
• Communication Interfaces: Wi-Fi 2.4GHz, Ethernet (LAN), Bluetooth
• Operating Temperature: -25°C to +55°C
• Mounting: DIN rail (35mm)
• Protection Degree: IP20 (for installation in appropriate enclosures)

Key Features

• Three-Phase Monitoring: Simultaneous measurement of all three phases plus neutral, providing comprehensive energy consumption data
• Real-Time Data: Continuous monitoring of voltage, current, power, power factor, and frequency for each phase
• Energy Analytics: Detailed reporting on active, reactive, and apparent energy consumption with historical data tracking
• Multiple Connectivity: Simultaneous Wi-Fi and Ethernet support with Bluetooth for initial configuration
• Cloud Integration: Compatibility with Shelly Cloud services for remote access and management
• API Access: Comprehensive HTTP API for integration with third-party systems and custom applications
• Safety Compliance: Meets relevant European standards for electrical safety and measurement accuracy

Use Cases

The Shelly Pro 3EM 400A finds application across various sectors where precise three-phase energy monitoring is required. In commercial environments, it enables facility managers to monitor energy usage patterns, identify inefficiencies, and implement cost-saving measures. Manufacturing facilities utilise its capabilities for load monitoring and power quality analysis across production equipment. For retail establishments and office buildings, the device provides detailed energy consumption data to support sustainability initiatives and reduce operational costs. In multi-tenant residential buildings, it facilitates accurate energy allocation and submetering while providing residents with transparent consumption information.