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SHELLY - WiFi-operated 3 Phase Energy Meter and Contactor Control




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Shelly 3EM is an energy monitor with integrated relay output which can be used for contactor control.

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Monitor the consumption of any home appliances, electric circuit and office equipment (lights, power lines, security systems, heating and cooling, etc.) individually. The consumption of your whole home or generated electricity from solar panels with the only one of its kind WiFi-operated Energy Meter with contactor control functionality in the world.

Shelly 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 points of a mono-phase electrical system and measure each of them separately.

Wi-Fi connected

Shelly 3EM can be connected to any Wi-Fi network or can operate as an Access Point.

Power supply

Each phase of Shelly 3EM must be 110-230V ±10, 50/60Hz AC

Monophase systems

Shelly 3ЕМ can also monitor monophase electrical systems with up to 3 points simultaneously.

Contactor control

Shelly 3EM has an integrated 10A relay output for contactor control.

Mobile app control

Turn Shelly 3EM on/off directly from your smartphone or tablet. You can manage Shelly 3EM’s output from the Shelly Cloud app, MQTT or Rest API.

Overconsumption and overpower protection

Shelly 3EM can automatically turn off the whole circuit if consumption or energy (pre-paid energy option) reaches the set limit.

Embedded web server

Turn on/off Shelly 3EM’s contactor output directly, without the need of any additional controller or hub.

Sunrise/sunset schedules

Shelly 3EM can automatically turn on/off the power based on the sunrise/sunset hours.

Weekly schedules

Choose a time and create custom daily schedules for your Shelly 3EM.


  • Precise 3-phase energy metering
  • Up to 120A per phase
  • Integrated 10A contactor control
  • Solar and Wind power compatible
  • Factory calibrated with over 99% accuracy
  • DIN mountable
  • Wi-Fi enabled
  • Cloud and MQTT Enabled
  • 365 days power consumption history
  • Anti energy theft protection
  • Compatible with Google Home and Amazon Echo
  • Power supply: 110-230V ±10% 50/60Hz AC
  • Power Metering: 3 channels, up to 120A each
  • Consumption history: 365 days built-in energy history (Wh)
  • Contactor control: Maximum load 10A
  • Electrical consumption: <1 W
  • Radio signal power: 1mW
  • Wireless/WiFi Protocol: 802.11 b/g/n (2.4 GHz)
  • Frequency: 2400 – 2484 MHz
  • Operational range (depending on local construction):
    • up to 50 m outdoors
    • up to 30 m indoors
  • Working temperature: 0 – 40°C
  • Dimensions (HxWxL): 73 x 57 x 22 mm
  • Complies with EU standards:
    • RE Directive 2014/53/EU
    • LVD 2014/35/EU
    • EMC 2004/108/WE
    • RoHS2 2011/65/UE