Description
The Shelly Pro 3EM 120A is a professional-grade three-phase energy meter designed for accurate, real-time monitoring of electrical consumption and production. Mounted on a standard DIN rail, it provides precise measurements for voltage, current, power factor and energy across all three phases. With built-in Wi-Fi, LAN and Bluetooth, it integrates easily into smart-home and industrial systems, offering full local control without requiring a separate hub.
Capable of handling up to 120 A per phase using external current transformers, the Shelly Pro 3EM is perfectly suited for homes with heavy loads, apartment buildings, commercial facilities, and PV installations. It supports 4-quadrant measurements, allowing it to monitor both imported and exported energy — ideal for tracking solar production and grid consumption.
The device also stores up to 60 days of historical data with one-minute resolution, and supports scripting, webhooks and multiple communication protocols such as MQTT, Modbus TCP and WebSocket, making it a powerful tool for advanced energy management.
Technical specifications
| Parameter | Specification |
|---|---|
| Mounting | DIN-rail |
| Dimensions | 94 × 19 × 69 mm |
| Weight | 62 g |
| Supply voltage | 100–260 V AC, 50/60 Hz |
| Current measurement | Up to 120 A per phase (via CT clamps) |
| Voltage measurement | 100–260 V RMS per phase |
| Accuracy | ±1% (2–120 A), ±2% (1–2 A), ±5% (0–1 A) |
| Data logging | 60 days, 1-minute intervals |
| Operating temperature | –20 °C to +40 °C |
| Humidity | 30% to 70% RH |
| Connectivity | Wi-Fi 2.4 GHz, Ethernet LAN, Bluetooth |
| Supported protocols | MQTT, Modbus TCP, HTTP, WebSocket, mJS scripting |
| Measurement standard | Class B (IEC 62053-21) |
