Shelly Pro 3EM – 120A
£157.79
DIN-rail energy meter for single- or three-phase installations, using three 120A current transformers to measure voltage, current, power and power factor per phase. Gen2 firmware with LAN, WiFi and Bluetooth. Suited to whole-home, commercial or industrial monitoring, including solar import/export tracking. No built-in relay.
- 3 x 120A current transformers for three-phase measurement
- Accuracy class B (IEC 62053-21), plus or minus 1% precision
- Stores 60 days of 1-minute interval data locally
- Tracks both imported and exported energy, ideal for solar PV systems.
Buy the Shelly Pro 3EM - 120A online in the UK from ShellyUK — genuine Shelly stock with fast UK delivery.
The Shelly Pro 3EM - 120A is a next-generation DIN rail mountable single or three-phase energy meter, designed for professional-grade monitoring and management of energy consumption across residential, commercial, and industrial installations. Enhanced with Gen2 firmware, LAN connectivity, and 3 x 120A three-phase current transformers, it delivers precision, flexibility, and reliability for integrators and advanced users alike.
This professional-grade energy meter measures accumulated energy as well as real-time values for voltage, current, active and apparent power, and power factor for each phase. It supports 4‑quadrant measurement and multiple wiring configurations, making it suitable for everything from whole-home energy monitoring to complex industrial power distribution systems. With an accuracy class B (IEC 62053‑21) and 1% measurement precision, it provides dependable data you can trust.
Shelly Pro 3EM - 120A stores up to 60 days of 1-minute interval data in non-volatile memory and includes an integrated real-time clock, ensuring timestamps remain accurate even without an internet connection. This device is photovoltaic-ready and can track both imported and exported energy, making it ideal for solar and renewable energy systems.
Designed for seamless integration, it supports LAN, WiFi, and Bluetooth connectivity, and can communicate locally or via the cloud using protocols such as Modbus, MQTT, HTTP, and WebSocket—with all connections secured via TLS. It also features an embedded web interface for direct configuration and monitoring.
External contactor control is available using the Shelly Pro 3EM Switch Add-on, enabling you to automate load control based on real-time data or custom scripts. Please note that the device does not include a built-in relay.
Thanks to its compact DIN rail design and included 120A current transformers, the Shelly Pro 3EM - 120A is easy to install in tight electrical panels, making it ideal for a wide range of applications, including:
- Whole-home or commercial energy monitoring
- Factory and industrial power optimisation
- Data centre or substation monitoring
- Renewable energy installations (solar/wind)
- EV charger and high-load appliance tracking
- Smart grid and building management systems
With its robust hardware, advanced connectivity options, and long-term data logging capabilities, the Shelly Pro 3EM - 120A is the ultimate professional tool for precise energy measurement, intelligent automation, and optimised power management.
3 x 120A current transformers for three-phase measurement
Accuracy class B (IEC 62053-21), plus or minus 1% precision
Stores 60 days of 1-minute interval data locally
Tracks both imported and exported energy, ideal for solar PV systems.
Where you'd use it
Solar Import/Export Tracking
Fit the Pro 3EM - 120A ahead of a solar inverter to log imported versus exported energy across all three phases, useful for checking a PV system is actually earning its keep.
Whole-Panel Load Visibility
Mount it on the DIN rail in a workshop or plant room consumer unit to monitor each phase separately, with 60 days of 1-minute data stored locally for spotting unusual consumption patterns.
Automated Load Shedding
Pair it with the Pro 3EM Switch Add-on to drop a contactor-controlled circuit such as an EV charger or immersion heater automatically when total demand approaches a set threshold, since the meter itself has no built-in relay.
Specification
Connectivity
- Wi-Fi protocol
- 802.11 b/g/n (2.4 GHz)
- Operational range (depending on local construction) • up to
- 50m outdoors • up to 30m indoors
- Bluetooth protocol
- 4.2
Physical & Build
- Mounting DIN rail
- (H x W x L)
- 94 x 19 x 69 mm
Environmental
- Ambient humidity
- 30% to 70% RH
Power & Electrical
- Power supply voltage
- AC 110-240V, 50/60Hz
- Power consumption < 3W
- Power metering
- 3 channels, up to 120A each
Other
- Ambient temperature
- -20°C to +40°C
- Voltmeters (RMS for each phase)
- 100-260 V
- Voltmeters accuracy
- ±1%
- Ammeters (RMS via CT for each phase and the Neutral)
- 0-120 A
- Ammeters accuracy • ±1% at
- 2-120 A • ±2% at 1-2 A • ±5% at 0-1 A
- Power and energy meter types • Active and apparent power • Active and apparent energy • Power factor • Fundamental active and reactive energy
- Measurement data storage At least
- 60 days of 1 min data resolution
- Data export CSV for PQ recorded values, JSON format export trough RPC
- CPU ESP32-D0WDQ6
- Flash
- 16 MB
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