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Shelly EM single phase energy meter with contactor control

Shelly EM is Shelly’s compact size single phase power meter, with max 2 x 120A capacity. With Shelly EM you can also measure how much energy your solar system produces and the power consumption ath the same time.

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Factory SKU ID:
Supported protocols:
in stock (30+ pcs)
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Shelly EM is Shelly's single phase power meter for recommended for both home and corporate use. Shelly ЕМ can monitor energy consumption in real time in 2 points simultaneously (up to 120A each). With Shelly EM you can also measure how much energy your solar system produces and the power consumption at the same time.

365 day built-in energy history.
We developed Shelly ЕМ to allow you to monitor the status and history, as well as the current and past electrical power consumption for the day, week, month or year.

Small size full of functionalities: Intelligently designed to fit in most standard electrical boxes and switches. Shelly EM is smaller than  cookies stacked together.

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.

Detailed info about electricity consumption: With Shelly EM, you can view the quality of your energy network regarding active power, reactive power, voltage, and power factor. Monitor your facility or home to avoid additional expenses or drastic drops in energy that may damage your appliances and machines.


  • 110-230V ±10, 50/60Hz AC, Shelly EM is compatible with all major international voltage standards.
  • Small size: 39x36x17mm
  • equipped with built-in Wi-Fi
  • precise power meter with 1% accuracy, 50A and 120A current transformers are available, sold separately
  • MQTT, rest API support
  • Monthly expenses
  • 365 days consumption history stored on the device
  • User friendly charts
  • Detailed report downloadable in csv
  • Relay output for contactor control: 2 A / 230 VAC / 50/60 Hz



  • 2 x consumption (W),
  • 1 x current (A)
  • 1 x voltage (V)
  • 2 x energy (Wh), consumed energy from power grid
  • 2 x energy (Wh), generated energy from a photovoltaic system
  • 2 x reactive power (Var)


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 EM output from Shelly app, MQTT or Rest API
  • On home networks it seamlessly integrates with home automation systems via HTTP and/or UDP protocols



  • overpower control


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 facotry 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:
one-phase, two circuit high performance power meter, even for 2 way power consumption (power consumption + recharge with solar panel)
Device power supply:
110V-240V AC
230V AC (live and neutral)
DIN rail compatible:
yes, together with Shelly DIN-adapter (not included)
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 (2A)
Dimmer feature:
Power consumption metering:
yes, high performance, single phase, max. 2 x 120A, even two-way (power consumption + solar recharge)
Number of gangs / circuits:
Rated current (output):
2 x 120A or 2 x 50A, up to the connected current transformer
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)
40 g/pcs
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Shelly EM single phase energy meter with contactor control
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