Shelly Pro 3EM-400A

Overview:

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. It can work standalone in a local LAN and/or Wi-Fi network, or it can also be operated through cloud home automation services through MQTT, HTTP, and WebSocket. All inbound connections support TLS. The Device reports accumulated energy as well as instantaneous voltage, current, active, and apparent power per phase in real time. It stores data in non-volatile memory that can be retrieved for a period of up to 60 days in 1-minute intervals.
The Device has a real-time clock to keep the correct time if the connection to an SNTP server is lost. Shelly Pro 3EM can be accessed, set up, and monitored remotely by the User, as well as the Device can access and communicate with an automation system, as long as they are in the same network infrastructure. The Device has an embedded Web Interface which can be used to monitor and control the device, as well as adjust its settings.

⚠NOTICE! The Device does not have a built-in relay. Contactor control is provided using a Shelly Pro Addon attached to the Shelly Pro 3EM.

Features:

• 4 Quadrant measurement
• DIN rail mounting
• Multiple connection types
• Current transformer connection
• Phase sequence error detection* (option)
• Channel-to-channel calibration**
• No load threshold***
• Optical pulse indication of energy usage
• Real-time clock
• Data logs
• Accuracy Class B (IEC 62053-21)
• Photovoltaic ready
* The Device has phase sequence error detection circuits. This detection works on phase voltages and considers only the zero crossings. The regular succession of these zero-crossing events is Phase A followed by Phase B followed by Phase C. If the sequence of zero-crossing events is, instead, Phase A followed by Phase C followed by Phase B, then a phase_sequence error is reported when the Phase sequence error detection option is enabled.
** At least 500 W load is required for each channel.
*** In case the total load for the three channels drops below 30 VA per channel the measured power level will be displayed, but no consumed energy will be accumulated to the energy statistics and a No load threshold notification will be displayed in the Device web interface and the mobile application.

Main Applications:

• Residential
• MDU (Multi Dwelling Units - apartments, condominiums, hotels, etc.)
• Light commercial (small office buildings, small retail/restaurant/gas station, etc.)
• Industrial (factories, power plants, water processing, refineries, etc.)
• Agricultural (farms, barns, silos, etc.)
• Government/municipal
• University/college

Simplified internal schematics:

Device electrical interfaces:

• Inputs
   • 4 line inputs on screw terminals: 3 L and 1 N
   • 4 current transformer inputs: 3 for L current measurements and 1 for N current measurement
• Ethernet port
   • 1 RJ45 connector
⚠CAUTION! Plug in or unplug the LAN cable only when the Device is powered off! The LAN cable connector must not be metallic in the parts touched by the user to plug in or unplug the cable.

Add-on interface

• Shelly proprietary serial interface

⚠CAUTION! High voltage on the add-on interface when the Device is powered!

Connectivity:

• Wi-Fi
• Ethernet
• Bluetooth N.B. Each connectivity option can be enabled or disabled by the user.

Safety features:

• Overheating protection

Supported load types:

• Resistive (incandescent bulbs, heating devices)
• Capacitive (LED light drivers, capacitor banks, electronic equipment, motor start capacitors)
• Inductive (transformers, fans, refrigerators, air-conditioners)

User interface:

• Inputs
   • One tactile dome button
   • Press briefly to toggle the state of the built-in relay.
   • Press and hold for 5 sec to activate Device AP.
   • Press and hold for 10 sec to factory reset.
• Outputs
   • LED indication
   • Power: Red light if the power supply is connected.
   • Wi-Fi (varies):
       • Blue light if in AP mode.
       • Red light if in STA mode, and not connected to a Wi-Fi network.
       • Yellow light if in STA mode, and connected to a Wi-Fi network. Not connected to Shelly Cloud or Shelly Cloud disabled.
       • Green light if in STA mode, and connected to a Wi-Fi network and the Shelly Cloud.
       • The LED will be flashing Red/Blue if OTA update is in progress.
• LAN: Green light if LAN is connected.
• Out: Red light if the output relay contact is closed.
• Count: Red light will be flashing when the Device is measuring energy according to settings with frequency dependent on the energy flowing through the measured circuit.

Specification:

Physical:

• Size (HxWxD): Button: 94x19x69 mm
• Weight: 62g
• Mounting: DIN Rail
• Screw Terminals Max Torque: 0.4Nm
• Conductor Cross Section: 0.5 to 2.5 mm² / 20 to 14 AWG (solid, stranded and bootlace lugs)
• Conductor Striped length: 6 to 7 mm
• Shell material: Plastic
• Colour: White

Environmental:

• Ambient temperature: -20 °C to 40 °C
• Humidity: 30 % to 70 % RH
• Max. Altitude: 2000m

Electrical:

• Power supply voltage AC: 100 - 260 v, 50/60 Hz
• Power supply voltage AC: N/A
• Power Consumption: < 3W

Output circuits ratings:

• Max switching voltage AC: 240 V
• Max switching voltage DC: N/A
• Max switching current: 2 A

Sensors, meters:

• Internal-temperature sensor: Yes
• Voltmeter (RMS): 100 - 260 V
• Voltmeters accuracy: ¬±1 %
• Ammeters (RMS via CT): 0 - 400 A
• Ammeters accuracy: ¬±1 % (5 - 50 A), ¬±2 % (0 - 5 A)
• Power and energy meters: Active and apparent power, Active and apparent energy, Power factor Channel-to-channel calibration minimum load: 500W per channle No load threshold: 30VA per channle
• Measurement data storage: At least 60 days of 1 min data resolution
• Data export: CSV for PQ recorded values, JSON format export through RPC

Radio:

• RF band: 2400 - 2495 MHz
• Max. RF power: < 20 dbm
• Wi-Fi Protocol: 802.11 b/g/n
• Wi-Fi Range: upto 30m indoors adnd 50m 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)

MCU:

• CPU: ESP32-DOWDQ6
• Flash: 16 MB

Firmware Capabilities:

• Webhooks (URL actions): 20 with 5 URLs per hook
• Scripting: Yes
• MQTT: Yes
• CoAP: No

Basic wiring diagrams:

Resources:

• Components and APIs - This device
• Components and APIs - All Shelly devices and services
• Compliance
• Installation guide

Package includes:

• 1 X Shelly Pro 3EM-400A
• 3 x 400 A Current Transformers