The Shelly Pro 3EM is a three-phase energy meter, DIN rail mountable, that redefines consumption control. Equipped with Wi-Fi, LAN, and Bluetooth connectivity, it is the ideal solution for industrial, commercial, and residential installations that require accuracy and reliability in energy monitoring.

The Shelly Pro 3EM offers active energy measurement accuracy of Class B (IEC 62053-21). MODBUS protocol support enables easy and fast integration into existing industrial infrastructures, while simultaneous use of Ethernet and Wi-Fi (2.4 GHz) ensures uninterrupted data transmission, even under the most demanding conditions.

• Power Supply Voltage: AC 110-240V, 50/60Hz.
• Power Consumption: < 3W.
• Measurement Channels: 3 channels, up to 120A each.
• Measurement Accuracy: Class B (IEC 62053-21) with typical accuracy of 1%.
• Measurement Types: Active and apparent power, active and apparent energy, power factor, fundamental active and reactive energy.
• Wi-Fi: Protocol 802.11 b/g/n (2.4 GHz).
• Bluetooth: Version 4.2.
• Ethernet (LAN): Yes, for stable wired connection.
• CPU: ESP32-D0WDQ6.
• Flash Memory: 16 MB.
• Mounting: DIN rail.
• Ambient Temperature: -20°C to +40°C.
• Ambient Humidity: 30% to 70% RH.
• Data Storage: At least 60 days with 1-minute resolution (internal memory).
• Data Export: CSV format for PQ records, JSON via RPC.

• Photovoltaic Management (Net Metering): Because the Shelly Pro 3EM supports 4-quadrant measurement, it can simultaneously monitor how much energy your panels produce, how much energy the building consumes, and how much energy is "returned" to the grid.
• Overload Protection (Load Shedding): In installations with limited power supply, the Shelly Pro 3EM can act as a "guardian".
• Industrial Monitoring & Preventive Maintenance: In factories or workshops, monitoring phase-by-phase consumption on a machine can reveal faults,
• Cost Allocation in Rentals / Airbnb: If you have a building with a shared panel but different tenants (e.g. a property divided into 3 small studios), the Shelly Pro 3EM can separately measure the consumption of each phase (if each studio is connected to a different phase).