Shelly Pro 3EM-3CT63 Single or Three-Phase DIN-Rail Energy Meter

The SHELLY-PRO-3EM-3CT63 represents a sophisticated three-phase energy monitoring solution designed for professional electrical installations. This system combines the main Shelly Pro 3EM unit with three 3CT63 current transformers to deliver comprehensive electrical parameter measurement across all phases and the neutral conductor. Engineered for precision and reliability, it serves as an essential tool for energy management, load balancing, and power quality analysis in commercial and industrial environments.

Featuring DIN rail mounting compatibility and robust connectivity options including Wi-Fi and Bluetooth, the system enables real-time monitoring and historical data analysis through its comprehensive measurement capabilities. The device maintains high accuracy across wide voltage and current ranges while providing detailed insights into power consumption patterns. With extensive data storage and export functionalities, it offers both immediate operational visibility and long-term trend analysis for optimising energy usage.

Technical Specifications

• Physical Dimensions: Shelly Pro 3EM: 94×19×69 mm / Shelly 3CT63: 14×54×26 mm
• Weight: Shelly Pro 3EM: 62 g / Shelly 3CT63: 32 g
• CT Aperture: Ø9 mm / Ø0.35 in
• Wire Diameter: 6 mm / 10 AWG
• Screw Terminals Max Torque: 0.4 Nm / 3.5 lb·in
• Conductor Cross Section: Shelly Pro 3EM: 0.5 to 2.5 mm² / Shelly 3CT63: 0.2 to 2.5 mm²
• Mounting: Shelly Pro 3EM: DIN rail / Shelly 3CT63: Freestanding on phase wires
• Power Supply: 100-260 V ~ 50/60 Hz
• Power Consumption: < 3 W
• Measurement Range: Voltage: 100-260 V RMS / Current: 0-63 A RMS
• Measurement Accuracy: Voltage: ±1% / Current: ±1% (2-63A), ±2% (1-2A), ±5% (0-1A)
• Wireless Connectivity: Wi-Fi 802.11 b/g/n / Bluetooth 4.2

Key Features

• Three-Phase Monitoring: Comprehensive measurement of all three phases plus neutral with individual current transformers for each circuit
• High Precision Measurement: Accurate monitoring of active power, apparent power, power factor, and energy consumption with detailed resolution
• Advanced Data Management: Storage of at least 60 days of 1-minute resolution data with CSV and JSON export capabilities
• Robust Connectivity: Dual wireless communication through Wi-Fi and Bluetooth for flexible integration and remote access
• Professional Installation: DIN rail mounting compatibility and screw terminal connections suitable for electrical distribution boards
• Extended Functionality: Webhooks support, Wi-Fi range extension, BLE gateway capability, and scripting for custom applications

Use Cases

The system is ideally suited for commercial building energy management, where it enables detailed monitoring of three-phase power distribution and identifies opportunities for load balancing and efficiency improvements. Industrial facilities benefit from its ability to track machine-specific energy consumption and detect abnormal power usage patterns that may indicate equipment issues. Data centres and server rooms utilise the monitoring capabilities for precise power usage effectiveness calculations and capacity planning. The solution also serves electrical contractors and energy auditors requiring accurate, verifiable measurements for compliance reporting and energy optimisation programmes.