Energy cost meter SHELL Shelly Pro 3EM-3CT63 AC 63 A 50–60 Hz DIN 94×19×69 mm

Shelly Pro 3EM-3CT63 is a DIN-rail mountable single- or three-phase energy meter designed for monitoring AC electrical consumption up to 63 A. The compact unit (94 × 19 × 69 mm) works with three external current transformers and reports accumulated energy, instantaneous voltage, current, active and apparent power per phase in real time. It supports LAN and Wi‑Fi connectivity, Modbus, MQTT, HTTP and WebSocket protocols with TLS for inbound connections, and stores up to 60 days of 1‑minute interval measurements in non-volatile memory. The device includes a real-time clock and an embedded web interface for local configuration, monitoring, and remote access within the same network.

Advantages

The meter combines DIN-rail form factor and compact dimensions for easy installation in distribution panels. It offers flexible connectivity (LAN/Wi‑Fi) and multiple communication protocols (Modbus, MQTT, HTTP, WebSocket) for integration with automation systems. Data logging to non-volatile memory for up to 60 days at 1‑minute resolution and a real-time clock ensure reliable historical records. TLS support for inbound connections increases communication security. The device can operate standalone in a local network or be integrated into cloud and third‑party systems.

Suitable for

• Monitoring energy consumption in residential distribution boards
• Tracking multi-circuit or three-phase consumption in small commercial installations
• Integration with building automation systems via Modbus, MQTT or HTTP
• Energy cost calculation and consumption reporting for tenants or operators

Key specifications

• Mounting: DIN-rail
• Supported systems: single-phase or three-phase (with external current transformers)
• Maximum current (via CTs): 63 A
• Frequency: 50–60 Hz
• Housing dimensions: 94 × 19 × 69 mm
• Measurements: accumulated energy, voltage, current, active and apparent power per phase
• Data storage: up to 60 days at 1‑minute intervals in non-volatile memory
• Connectivity: LAN, Wi‑Fi
• Protocols: Modbus, MQTT, HTTP, WebSocket; inbound connections support TLS
• Real-time clock: onboard

How to use

Mount the Shelly Pro 3EM-3CT63 on a standard DIN rail inside the distribution panel and connect the external current transformers to the measured conductors according to the installation guidelines. Connect the unit to the local network via LAN or Wi‑Fi, open the embedded web interface to configure phases, CT ratios, communication settings and logging intervals, and integrate the device with your automation system or cloud service using the supported protocols. Use the web interface or compatible management tools to view real-time measurements and retrieve stored data.

Usage recommendations

Note that the device does not include a built-in relay; if contactor control is required, use the Shelly Pro 3EM Switch Add-on attached to this meter. Ensure CTs are correctly oriented and configured, and follow local electrical regulations during installation.