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Shelly PRO 3EM-400A next generation professional 3-phase energy meter (3 x 400A)

PRO 3EM-400A is the next-generation DIN-mountable 3-Phase Energy Meter from Shelly, with 3 x 400A current transformers included.

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.

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Factory SKU ID:
Supported protocols:
Bluetooth, Ethernet / LAN, Wi-Fi
in stock (13 pcs)

Shelly Pro 3EM-400A is the biggest capacity version of Pro 3EM 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. 

Enhanced with all the gen2 firmware flexibility of Shelly products 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: Measure capacitive and inductive load types of active imported and exported energies.
  • Accuracy Class B (IEC 62053-21) active energy: Shelly Pro 3EM has a measurement accuracy of 1%.
  • Photovoltaic ready
  • Phase sequence error detection* (option)
  • Optical pulse indication of energy usage
  • This product version includes 3 pieces of 400A Current Transformers
  • MODBUS support: Allows for easy and fast deployment in existing industrial installations.
  • Wi-Fi, LAN, and Bluetooth connectivity: Simultaneous Ethernet and Wi-Fi usage. MQTT, inbound and outbound WebSocket, UDP, mTLS support.
  • Power monitoring: Monitors mono-phase electrical systems with up to 3 points simultaneously. Fast notifications and at least 60 days of 1-minute records storage. Stores data in non-volatile memory.
  • Scripting functionalities: Shelly Pro 3PM fully supports mjS scripting, allowing you to create further features and functionalities.
  • Industry-grade security 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.


Industrial installations
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.

2-way energy consumption monitoring
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.

Local control
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.

Solar panels monitoring and control
Keep track of how much energy your solar panels or wind turbines are generating and save effortlessly. Shelly Pro 3EM provides real-time information about the efficiency of the solar and wind energy system, as well as historical data on how much energy has been generated and consumed every minute for the past 60 days. This helps you control the energy flow, getting the most out of your solar panels and wind turbines. To take it a step further, connect Shelly Pro 3EM to your other Shelly devices and create scenes to trigger desired actions like turning off appliances or sounding alarms.

Shelly PRO 3EM - Specifications

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:
Operating temperature range:
-20 °C - 40 °C
Operating humidity range:
30% - 70% RH
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 3 circuit (max 3 x 400A)
Number of gangs / circuits:
Rated current (output):
3 x 400A
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:
yes, but Bluetooth is only used for device pairing with phone
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)
1.08 kg/pcs
Package offers
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Shelly PRO 3EM-400A next generation professional 3-phase energy meter (3 x 400A)
Shelly PRO 3EM-400A next generation professional 3-phase energy meter (3 x 400A)
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
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
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
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)