Shelly Pro 3EM

Device identification

Device name: Shelly Pro 3EM
Device model: SPEM-003CEBEU120
Device SSID: ShellyPro3EM-XXXXXX

Short description

Shelly Pro 3EM (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 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

Each connectivity option can be enabled or disabled by the user.

Safety features

Internal temperature sensing and reporting

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 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.

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.
- 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.

Specifications

Type	Value
Physical
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
Color:	White
Environmental
Ambient temperature:	-20 °C to 40 °C / -5 °F to 105 °F
Humidity:	30 % to 70 % RH
Max. altitude:	2000 m / 6562 ft
Electrical
Power supply voltage AC:	100 - 260 V, 50/60 Hz
Power supply voltage DC:	N/A
Power consumption:	< 3 W
Sensors, meters
Internal-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
Compatible CT	CT 120A
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
Channel-to-channel calibration minimum load	500 W per channel
No load threshold:	30 VA per channel
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:	Up to 30 m / 100 ft indoors and 50 m / 160 ft 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-D0WDQ6
Flash:	16 MB
Firmware capabilities
Webhooks (URL actions):	20 with 5 URLs per hook
Scripting:	Yes
MQTT:	Yes
CoAP:	No

Basic wiring diagrams

Shelly Pro 3EM mono-phase wiring diagram

Legend

Terminals		Wires
A	Phase A input	LA	Phase A live (110-240 V) wire
B	Phase B input	LB	Phase B live (110-240 V) wire
C	Phase C and power supply input	LC	Phase C live (110-240 V) wire
N	Neutral terminal	L	Mono-phase live (110-240 V) wire
IA	Phase A current transformer input	N	Neutral wire
IB	Phase B current transformer input	Current transformers
IC	Phase C current transformer input	CTA	Phase A current transformer
IN	Neutral current transformer input	CTB	Phase B current transformer
		CTC	Phase C current transformer
		CTN	Neutral current transformer (Optional. Not included)