Shelly Pro 3EM

Out of Stock, can be pre-ordered


Next-generation DIN-mountable 3-Phase Energy Meter 

Shelly Pro 3EM is a DIN rail mountable three-phase energy meter. Enhanced with all the gen2 firmware flexibility and LAN connectivity, it provides professional integrators with additional options for end-customer solutions. Shelly Pro 3EM reports accumulated energy as well as instantaneous voltage, current, and power factor per phase in real-time.

  • 4 quadrant measurement with multiple connection types
  • Accuracy Class B (IEC 62053-21)
  • Photovoltaic ready
  • Phase sequence error detection* (option)
  • Optical pulse indication of energy usage
  • Measurement accuracy tо 1%
  • Stores data in non-volatile memory that can be retrieved for a period of up to 60 days in 1-minute intervals
  • Package includes 3 pieces of 120A Current Transformers.


Next-generation 3-Phase Energy Meter

Shelly Pro 3EM is a Wi-Fi-operated DIN-mountable 3-Phase Energy Meter with Wi-Fi, Bluetooth, and LAN connectivity. With active energy measurement accuracy of 1%, Shelly Pro 3EM can be used to monitor the consumption of any home appliances, electric circuits, and office equipment individually. It features 60 days of on-device historical data with a 1-minute resolution for each phase. Additionally, its scripting functionalities allow for the execution of complex scenes and provide broader monitoring abilities.

Shelly Pro 3EM supports mTLS for MQTT, HTTP, and secure outbound WebSockets. Its industry-grade security allows for direct connections to your cloud infrastructure, reducing the cost of deploying complex networks and VPNs.

Shelly Pro 3EM brings support for MODBUS for voltage, current, power, and energies. You can accurately sample your energy usage and instantaneous values of voltage, current, and power. Our new firmware platform allows for custom implementation that can report as fast as every 100ms to your infrastructure.

Monitor your home, office, or factory, and avoid additional expenses or drops in voltage that can damage your appliances and devices. Shelly Pro 3EM can calculate 2-way consumption: produced and used energy for each of the three phases. The device can be configured to measure three separate circuits of a mono-phase electrical system. View the quality of your electricity network regarding active power, reactive power, voltage, and power factor.

Thanks to Shelly Pro 3EM's scripting functionalities and webhooks, you can now easily control other Shelly or Wi-Fi devices on your local network. Use these capabilities to set exact parameters for heating, cooling, or electric vehicle charging based on PV production and have your devices automatically shed power usage. All these work without using a cloud.


Current Transformer: 3 x CT120 included in the package
Size (HxWxD): 94x19x69 ±0.5 mm / 3.70x0.75x2.71 ±0.02 in
Weight: 62 ±1 g / 2.19 ±0.05 oz
Mounting: DIN rail
Screw terminals max torque: 0.4 Nm / 4.43 lbin
Conductor cross section: 0.5 to 2.5 mm² / 20 to 14 AWG (solid, stranded and bootlace lugs)
Conductor stripped length: 6 to 7 mm / 0.24 to 0.28 in
Shell material: Plastic
Color: White
Ambient temperature: -20 °C to 40 °C / -5 °F to 105 °F
Humidity: 30 % to 70 % RH
Max. altitude: 2000 m / 6562 ft
Power supply voltage AC: 110 - 240 V, 50/60 Hz
Power supply voltage DC: N/A
Power consumption: < 3 W
Sensors, meters
Temperature sensor: Yes
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 % (2 - 120 A), ±2 % (1 - 2 A), ±5 % (0 - 1 A)
Power and energy meters: Active and apparent power; Active and apparent energy; Power factor; Fundamental active and fundamental 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
RF band: 2401 - 2495 MHz
Max. RF power: <20 dBm
Wi-Fi protocol: 802.11 b/g/n
Wi-Fi Range: Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors (Depends on local conditions)
Bluetooth Protocol: 4.2
Bluetooth Range: Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors (Depends on local conditions)"
Flash: 16 MB
Firmware capabilities
Webhooks (URL actions): 20 with 5 URLs per hook
Scripting: mJS
CoAP: No

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Customer Reviews

Based on 2 reviews
Kruse Ludington

Delivered quickly along with the 4"din rail for it I ordered (being in the US in an older home they do not use din rails) - running perfectly. Shelly products are truly outstanding. Easily added into Home Assistant, accurate readings as well!

Benoit Sauve
Working very well, easy integration with home assistant

Easy to use and well documented