Shelly Pro 3EM 3CT 63

Device identification

• Device name: Shelly Pro 3EM 3CT63

• Device model: SPEM-003CEBEU63

• Device SSID: ShellyPro3EM3CT63-XXXXXXXX

• Device Bluetooth ID: 0x1025

Short description

Shelly Pro 3EM-3CT63 (the Device) is a DIN rail mountable single or 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 Modbus, 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/channel 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-3CT63 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 3EM Switch Add-on attached to the Shelly Pro 3EM-3CT63.

Main features

• 4 Quadrant measurement

• DIN rail mounting

• Multiple connection types: three phase or single phase installations

• Current transformer connection: non contact measurements.

• Phase sequence error detection¹ (option)

• Channel-to-channel calibration²

• No load threshold³

• Optical pulse indication of energy usage

• Real-time clock: stored data keeps correct timestamps even if the internet connection is interrupted.⁴

• Data logs: up to 60 days of data stored on the device for later retrieval

• External contactor control: loads can be controlled based on device automation or scripts. Available with the addition of the Shelly 3EM Switch Add-on

• Accuracy Class B (active energy)⁵

• Photovoltaic ready

¹ 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 Shelly devices rely on internet connection for device clock. In case of installation network requirement or service interruption, the built-in clock provides correct timestamps for records.

⁵ The Device has a measurement accuracy of 1%, based on internal design validation and testing.

Use cases

Combined 3-phase current transformer (CT) that is designed to be mounted directly over a circuit breaker

1. Industrial Power Distribution:

   • In industrial settings with complex power distribution systems, a combined 3-phase CT mounted over a circuit breaker can efficiently measure and monitor current levels. This is crucial for optimizing energy usage and identifying potential issues in real-time.

2. Commercial Buildings and Facilities:

   • For commercial buildings and facilities, where space is often limited in electrical panels, the compact design of the CT is beneficial. Mounting it directly over circuit breakers allows for efficient use of space while ensuring accurate current measurement.

3. Motor Control Centers (MCCs):

   • Motor control centers, which are commonly found in manufacturing plants and industrial facilities, often have multiple circuit breakers. A combined 3-phase CT mounted over each breaker provides an integrated solution for monitoring motor currents, aiding in preventive maintenance and troubleshooting.

4. Data Centers:

   • In data centers, where precise monitoring of power consumption is crucial, combined 3-phase CTs can be installed over circuit breakers to measure the current flowing through critical equipment.

5. Renewable Energy Installations:

   • Combined 3-phase CTs can be used in renewable energy installations, such as solar or wind power systems. By mounting them directly over circuit breakers in the control panels, accurate current measurements can be obtained for monitoring and control purposes.

6. Substation Monitoring:

   • In electrical substations, where space is often at a premium, combined 3-phase CTs can be advantageous. Installing them directly over circuit breakers helps in monitoring the current levels in the different phases, contributing to the overall stability and reliability of the substation.

7. Building Management Systems (BMS):

   • For intelligent building management systems, having accurate real-time data on current consumption is essential. Combined 3-phase CTs can be installed over circuit breakers to provide the necessary information for energy management and demand response strategies.

8. Power Quality Monitoring:

   • In applications where maintaining power quality is critical, such as in sensitive electronic equipment or medical facilities, combined 3-phase CTs can be used to monitor current waveforms and identify any anomalies that might affect the quality of power supplied.

9. Electrical Panel Upgrades:

   • During electrical panel upgrades or retrofits, space constraints may arise. A combined 3-phase CT, designed for direct mounting over circuit breakers, offers a space-saving solution without compromising accurate current measurement.

10. Smart Grid Deployments:

    • In the context of smart grids, where real-time data is essential for grid management and optimization, combined 3-phase CTs can be deployed over circuit breakers to provide accurate current information for monitoring and control purposes.

In each of these use cases, the combined 3-phase CT offers a space-efficient and integrated solution for current measurement, contributing to the overall efficiency, safety, and reliability of the electrical systems.

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!

Detailed inputs and outputs description

Connector to Shelly Pro 3EM-3CT63

• three 2-pin MX3.0-2x1Y connectors

Inputs

• 6 current transformer line inputs on screw terminals: 3 for + current measurements and 3 for - current measurement

Connectivity

• Ethernet

• Wi-Fi

• Bluetooth

Protocols

• Modbus

• MQTT

• RPC

Safety function

• 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

Basic wiring diagrams

Fig. 1: Three-phase wiring diagram

Fig. 2: Single-phase wiring diagram

Legend

Installation

Legend

Shelly Smart Control

• Adding the device to the Shelly Smart Control

Troubleshooting

1. Check the correct installation of the CT:

   • If negative readings on a measured circuit are read and are not expected, check the correct installation of the CT (K->L).

2. Ensure that the device is properly powered:

   • Check power cables, outlets, and any power indicators on the device.

3. Inspect Connections:

   • Verify that all connections, including cables and wiring, are secure and properly seated. Loose connections can lead to functionality issues.

4. Review Device Settings:

   • If applicable, check and review the device settings. Ensure that configurations are correct and match your intended use.

5. Update Firmware/Software:

   • Check if there are any available firmware or software updates for the device. Keeping the device up-to-date can resolve known issues and improve performance.

6. Restart or Reboot:

   • Sometimes, a simple restart can resolve temporary glitches. Turn off the device, wait a few seconds, and then power it back on.

7. Check Network Connection:

   • If the device is connected to a network, ensure that the network settings are correct. Test the network connection and consider restarting routers or switches if needed.

8. Inspect Physical Components:

   • Physically inspect the device for any signs of damage, overheating, or unusual behavior.

9. Check Compatibility:

   • Ensure that the device is compatible with other components in your system, including hardware and software. Incompatibility issues can lead to malfunctions.

10. Monitor Environmental Factors:

    • Consider environmental factors such as temperature and humidity.

11. Inspect Power Supply Quality:

    • Poor power quality, including voltage spikes or fluctuations, can affect device performance. Consider using a surge protector or voltage regulator if needed.

*These are general troubleshooting steps, and the specific steps may vary based on the type of device or issue you are facing. If the issue persists and you are unable to resolve it, consider reaching out to our technical customer support.

Components and APIs

• This device

• All Shelly devices and services

Compliance

• Shelly Pro 3EM 3CT63 multilingual EU declaration of conformity 2025-07-30.pdf

• Shelly Pro 3EM-3CT63 AU NZ Certificate for Suitability.pdf

• Shelly Pro 3EM-3CT63 UK PSTI ACT Statement of compliance.pdf

Printed user guide

• Shelly Pro 3EM-3CT63 multilingual printed user and safety guide.pdf

• Ръководство за употреба и безопасност

Installation guides