Device identificationDevice name: Shelly Pro 3EM-400Device model: SPEM-003CEBEU400Device SSID: ShellyPro3EM400-XXXXXXShort descriptionShelly Pro 3EM-400 (The Device) 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-400 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-400.Features4 Quadrant measurementDIN rail mountingMultiple connection typesCurrent transformer connectionPhase sequence error detection1 (option)Channel-to-channel calibration2No load threshold3Optical pulse indication of energy usageReal-time clockData logsAccuracy Class B (active energy)4Photovoltaic ready1 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.2 At least 500 W load is required for each channel.3 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. 4 The Device has a measurement accuracy of 1%, based on internal design validation and testing.
Main applications
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Residential
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MDU (Multi Dwelling Units - apartments, condominiums, hotels, etc.)
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Light commercial (small office buildings, small retail/restaurant/gas station, etc.)
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Agricultural (farms, barns, silos, etc.)
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Government/municipal
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University/college
Simplified internal schematics
Device electrical interfaces
Inputs
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4 line inputs on screw terminals: 3 L and 1 N
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4 current transformer inputs: 3 for L current measurements and 1 for N current measurement
Ethernet port
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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
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Shelly proprietary serial interface
⚠CAUTION! High voltage on the add-on interface when the Device is powered!
Connectivity
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Ethernet
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Wi-Fi
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Bluetooth
Each connectivity option can be enabled or disabled by the user.
Safety features
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Internal temperature sensing and reporting
Supported load types
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Resistive (incandescent bulbs, heating devices)
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Capacitive (LED light drivers, capacitor banks, electronic equipment, motor start capacitors)
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Inductive (transformers, fans, refrigerators, air-conditioners)
User interfaceInputsOne tactile dome buttonPress briefly to toggle the state of the relay in the attached Shelly Pro 3EM Switch Add-on.Press and hold for 5 sec to activate Device AP.Press and hold for 10 sec to factory reset.OutputsLED indicationPower: 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.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.SpecificationsTypeValuePhysicalSize (HxWxD):94x19x69 ±0.5 mm / 3.70x0.75x2.71 ±0.02 inWeight:62 ±1 g / 2.19 ±0.05 ozMounting:DIN railScrew terminals max torque:0.4 Nm / 4.43 lbinConductor 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 inShell material:PlasticColor:WhiteEnvironmentalAmbient temperature:-20 °C to 40 °C / -5 °F to 105 °FHumidity:30 % to 70 % RHMax. altitude:2000 m / 6562 ftElectricalPower supply voltage AC:110 - 240 V, 50/60 HzPower supply voltage DC:N/APower consumption:< 3 WExternal protection:Tripping characteristic B or C, 16A max. rated current, min. 6 kA interrupting rating, energy limiting class 3Sensors, metersInternal-temperature sensor:YesVoltmeters (RMS for each phase):100 - 260 VVoltmeters accuracy:±1 %Ammeters (RMS via CT for each phase and the Neutral): 0 - 400 ACompatible CTCT-400A Ammeters accuracy:±1 % (5 - 400 A), ±2 % (0 - 5 A)Power and energy meters:Active and apparent powerActive and apparent energyPower factorFundamental active and fundamental reactive energyChannel-to-channel calibration minimum load:5000 W per channelNo load threshold:30 VA per channelMeasurement data storage:At least 60 days of 1 min data resolutionData export:CSV for PQ recorded valuesJSON format export through RPCRadioRF band:2400 - 2495 MHzMax. RF power:<20 dBmWi-Fi protocol:802.11 b/g/nWi-Fi Range:Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors(Depends on local conditions)Bluetooth Protocol:4.2Bluetooth Range:Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors(Depends on local conditions)MCUCPU:ESP32-D0WDQ6Flash:16 MBFirmware capabilitiesWebhooks (URL actions):20 with 5 URLs per hookScripting:YesMQTT:YesCoAP:NoBasic wiring diagrams LegendTerminalsWiresAPhase A inputLAPhase A live (110-240 V) wireBPhase B inputLBPhase B live (110-240 V) wireCPhase C and power supply inputLCPhase C live (110-240 V) wireNNeutral terminalLMono-phase live (110-240 V) wireIAPhase A current transformer inputNNeutral wireIBPhase B current transformer inputCurrent transformersICPhase C current transformer inputCTAPhase A current transformerINNeutral current transformer inputCTBPhase B current transformerCTCPhase C current transformerCTNNeutral current transformer (Optional. Not included)
Shelly Smart Control
Troubleshooting
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Components and APIs
Compliance
Printed user guide
