Shelly Pro 3EM - 3CT 63

Shelly Pro 3EM-3CT 63 – Professional 3-Phase Energy Meter (DIN Rail)

Shelly Pro 3EM-3CT63 is a DIN rail mountable single or three-phase energy meter designed for professional energy monitoring and advanced automation solutions. Powered by Shelly Gen2 firmware and enhanced with LAN connectivity, it delivers precise, real-time electrical measurements for residential, commercial, and industrial applications.

The device operates standalone within a local LAN and/or Wi-Fi network or integrates seamlessly with cloud and third-party automation platforms via Modbus, MQTT, HTTP, RPC, and WebSocket. All inbound connections support TLS encryption for secure communication.

This device does NOT have a built-in relay.
Contactor or load control requires the optional Shelly Pro 3EM Switch Add-on (sold separately).

• 4-Quadrant Measurement – Monitor import and export energy (Photovoltaic ready)
• Single or Three-Phase Support
• 63A Non-Contact CT Measurement (3CT63 included)
• DIN Rail Mountable – Compact professional installation
• Accuracy Class B (1% active energy)
• Real-Time Clock (RTC) – Maintains correct timestamps even without internet
• 60 Days Data Logging (1-minute resolution, stored locally)
• Phase Sequence Error Detection (optional)
• Channel-to-Channel Calibration (500W per channel)
• No Load Threshold Detection (30 VA per channel)
• Optical Pulse LED Indication
• Embedded Web Interface for setup, monitoring & control
• External Contactor Control via Shelly Pro 3EM Switch Add-on

Monitor accumulated energy and instantaneous electrical parameters per phase:

• Voltage (100-260V AC)
• Current (0-63A per phase)
• Active & Apparent Power
• Active & Apparent Energy
• Power Factor
• Fundamental Active & Reactive Energy

Data is stored in non-volatile memory and can be exported via CSV (Power Quality values) or JSON (RPC).

• Ethernet (RJ45)
• Wi-Fi 802.11 b/g/n (2.4 GHz)
• Bluetooth 4.2
• Modbus
• MQTT
• RPC
• Webhooks (20 hooks, 5 URLs per hook)
• Scripting Support
• TLS Encryption

Ideal for:

• Industrial power distribution monitoring
• Commercial buildings & facilities
• Motor Control Centres (MCC)
• Data centres
• Renewable energy & solar PV systems
• Substations
• Building Management Systems (BMS)
• Power quality monitoring
• Electrical panel upgrades
• Smart grid deployments

• Power Supply: 100-260V AC, 50/60 Hz
• Power Consumption: < 3W
• Current Transformers: 3CT63 (O9 mm conductor aperture)
• Measurement Accuracy: 1% (2-63A)
• Operating Temperature: -20oC to 40oC
• Humidity: 30% – 70% RH

• Device Size: 94 × 19 × 69 mm
• CT Size: 14 × 54 × 26 mm
• Mounting: DIN Rail
• Shell Material: Plastic (White)

With Gen2 firmware flexibility, scripting capabilities, Modbus support, and secure encrypted communication, Shelly Pro 3EM-3CT63 is designed for system integrators and advanced users who require accurate, reliable, and flexible energy monitoring.

Monitor smarter. Automate intelligently. Optimise energy usage with professional-grade precision.