Shelly Pro 3EM-120A 3-Phase DIN-rail Energy Meter

The Shelly Pro 3EM-120A represents a sophisticated three-phase energy monitoring solution designed for professional electrical installations. This microprocessor-managed device enables comprehensive remote monitoring and control of electrical circuits through various interfaces including mobile applications and web browsers. Engineered specifically for integration into distribution boards, it provides detailed energy consumption analytics for commercial and industrial environments where precise three-phase power monitoring is essential.

As part of the Shelly Pro series, this device is built for reliability in demanding applications, featuring DIN rail mounting compatibility for seamless installation in electrical cabinets. The unit operates both as a standalone device within local Wi-Fi networks and through cloud-based home automation services, offering flexibility in system integration. Its robust construction and advanced monitoring capabilities make it suitable for facilities requiring accurate energy measurement across all three phases with professional-grade precision.

Technical Specifications

• Electrical Ratings: 3x120A maximum current per phase, 3x230/400V AC voltage range
• Power Supply: 100-240V AC, 50/60Hz
• Communication: Dual-band Wi-Fi 2.4GHz & 5GHz, Ethernet LAN connection, Bluetooth for initial configuration
• Mounting: DIN rail enclosure compatible with standard distribution boards
• Measurement Accuracy: Class 1 accuracy for active energy measurement
• Operating Temperature: -25°C to +55°C
• Protection Degree: IP20 rated enclosure for indoor installation

Key Features

• Three-Phase Monitoring: Simultaneous measurement of voltage, current, power, and energy consumption across all three phases with individual phase analysis
• Real-time Data: Continuous monitoring of electrical parameters with detailed power quality analysis including frequency and power factor measurements
• Remote Accessibility: Full control and monitoring capabilities through web interface and mobile applications from any location with internet connectivity
• API Integration: Comprehensive application programming interface for custom integration with building management systems and automation platforms
• Historical Data: Energy consumption logging with detailed historical reports and consumption patterns analysis
• Safety Compliance: Designed and manufactured in accordance with relevant electrical safety standards and regulations

Use Cases

The Shelly Pro 3EM-120A is ideally suited for commercial establishments, industrial facilities, and large residential buildings requiring detailed three-phase energy monitoring. Its applications include load balancing across phases in manufacturing plants, energy consumption optimisation in retail centres, and power quality monitoring in office buildings. The device provides essential data for energy management programmes, cost allocation in multi-tenant buildings, and preventive maintenance scheduling through continuous electrical parameter monitoring.

Facility managers utilise this energy meter for sub-metering applications, allowing precise tracking of energy usage across different departments or production lines. The comprehensive data collection supports sustainability initiatives by identifying energy waste patterns and verifying the effectiveness of energy efficiency measures. Integration with building management systems enables automated responses to abnormal power conditions, enhancing overall electrical system reliability and operational efficiency.