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Shelly 3EM professional 3-phase energy meter with contactor control

Shelly 3EM is Shelly’s new compact size 3-phase professional energy meter solution, with 3 x 120A capacity current transformers.

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Factory SKU ID:
Supported protocols:
in stock (30+ pcs)

Shelly 3EM is Shelly's 3-phase professional power meter for recommended for both home and corporate use. Shelly 3ЕМ can monitor energy consumption in real time for a 3-phase system or 3 points or a monophase electrical system simultaneously (up to 120A each). With Shelly EM you can also measure how much energy your solar system produces and the power consumption ath the same time. It can also be used to monitor real-time energy consumption for each phase and compare it to the neutral to know if someone is stealing electricity.

It can automatically turn off the whole circuit if consumption or energy (pre-paid energy option) reaches the set limit and has integrated relay output made for contactor control.

365 days built-in energy history: Shelly 3EM allows you to monitor the status and history, as well as the current and past electrical power consumption for the day, week, month, or year. Shelly 3EM exports all data in CSV format in 5 minute intervals. The information can help for analysis and detailed statistics. All data gets stored in the cloud at incrementing intervals.

The perfect solution for manufacturers: Shelly 3EM can do all the work for you. The 3-phase energy meter can calculate energy cost for production, notify you if a machine is powered on during non-working hours, measure the real working time of each machine and allows remote on/off control for power optimization.

Full protection: Shelly 3EM will automatically shutdown and notify you when the defined consumption limit is exceeded.

Optimize energy usage: Ever wanted to live sustainably and save energy, money and CO2? With Shelly 3EM, you can monitor the consumption of each circuit, or of your whole home to optimize energy usage. In case you have solar panels or wind turbines, you can be aware how much energy was produced and make savings effortless.


  • 110-230V ±10, 50/60Hz AC, Shelly 3EM is compatible with all major international voltage standards.
  • Small size: 3 mm x 57 mm x 22 mm
  • equipped with built-in Wi-Fi
  • precise power meter 3 pcs. of 120A current transformers are included with the product
  • MQTT, Rest API support
  • 365 days consumption history stored on the device (even in offline mode)
  • User friendly charts
  • Detailed report downloadable in CSV
  • Relay output for contactor control: max 10 A


WiFi connection:

  • Shelly EM - similarly to other Shelly devices - has a built-in web server, that is, can work in Access Point mode.
  • It can connect to home or corporate WiFi network and be managed from the free Shelly Cloud app (available for Android and iOS)
  • No need for gateway, controller or hub, it connects directly to WiFi as a WiFi client or access point
  • Supported WiFi protocols: 802.11 b / g / n (2.4 GHz)
  • Can work as a standalone device or connected to Shelly's Cloud
  • Turn devices on/off directly from your smartphone or tablet. You can manage Shelly 3EM output from Shelly app, MQTT or Rest API
  • On home networks it seamlessly integrates with home automation systems via HTTP and/or UDP protocols


Scheduling, timers:

  • Choose a time and create custom daily schedules for your devices.
  • Auto turn on and off by hour or sunset and sunrise.


For developers:

  • Its factory firmware supports integration to various home automation systems.
  • You can manage ShellyEM output from Shelly app, MQTT or Rest API.
  • REST API documentation can be found here:
  • Shelly ЕМ comes with a programming/debug header which can be used to flash alternative firmware on the device.


One application, countless possiblities: With the best cloud service in the world, user-friendly interface, scenes, bulk control, and much more, the Shelly Cloud application allows you to control your home from anywhere. Each Shelly can be integrated and works with all other Shelly devices in the Shelly App.

Product type:
three-pase high performance professional power meter, even for two way power consumption (power consumption + recharge with solar panel),
Device power supply:
110V-240V AC
230V AC (live and neutral)
DIN rail compatible:
Max. power consumption:
1W, &lt
Built-in memory:
yes, power measurement data can be stored on the device, even in offline mode
Embedded relay:
no, but there is an output to a contactor
Dimmer feature:
Power consumption metering:
yes, high performance, three phase, or single phase circuit (max. 3 x 120A)
Number of gangs / circuits:
Rated current (output):
3 x 120A
Physical on/off button on device:
External switch supported:
Momentary switching (inching):
yes, auto on and auto off settings available
Surge protection:
Overheat protection:
Ethernet (RJ-45):
Wi-Fi standards:
802.11 b/g/n (2.4GHz)
RF transmitter / receiver:
Controllable from internet:
Manufacturer smartphone app:
yes, free app (Shelly Cloud) (iOS, Android)
Web admin interface:
yes, almost the same functionality as the app
Voice control:
Amazon Alexa and Google Assistant compatible
Cloud mode:
yes, Shelly devices may connect to factory cloud (optional setting)
LAN mode:
yes, works just in the local area network mode, with full functionality (adjustable)
REST API support:
MQTT support:
Supported integrations:
Amazon Echo, Google Home, HomeSeer, openHAB, Home Assistant, ioBroker, Hubitat, Hoobs, Symcan, Domoticz, nymea, SmartThings (beta), REST API
Schedulers, timers:
yes, (after synchronizing clock on the internet) limited number of timings operate in offline mode, any further timing can be run from the cloud in online mode
Notification functions:
send email, Shelly app notification
yes: on/off history in the app (the last 50 event for every Shelly account)
500 g/pcs
Package offers
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Shelly 3EM professional 3-phase energy meter with contactor control
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