Shelly 3EM-63T Gen3 - Single or Three-Phase Energy Meter

The Shelly 3EM-63T Gen3 is a compact energy meter with flat terminals (hence 'T' in the name), designed to monitor either a three-phase system or three independent single-phase circuits, integrating into smart home systems or professional setups to provide accurate, real-time data to optimise energy efficiency.

The device offers precise 4-quadrant measurement for accurate energy monitoring across both three-phase systems and single-phase circuits. Its flexible setup allows standalone Wi-Fi use or integration with popular home automation platforms such as Home Assistant. It can work standalone in a local Wi-Fi network, or it can also be operated through cloud home automation services through MQTT, HTTP, and WebSocket. All inbound connections support TLS.

It reports accumulated energy as well as instantaneous voltage, current, active and apparent power per phase in real time. It stores the data in non-volatile memory that can be retrieved for a period of up to 7 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, and an embedded Web Interface which can be used to monitor and control the device, as well as adjust its settings.

Its compact design makes installation easy. Additionally, it’s future-ready, supporting photovoltaic system monitoring to track solar energy production alongside grid usage.

Key features include:

• Wi-Fi operated, Bluetooth inclusion - connect the device to your Wi-Fi network. No HUB required!
• Energy Metering - monitor voltage, current, power factor, and active and apparent power and energy
• Advanced-Data Logging - stores energy data for up to 7 days in 1-minute intervals
• Flexible installation - easy fit to a DIN-rail circuit breakers
• Multiple Connection Types - supports three-phase or single-phase installations
• Current transformer connection - non-contact current measurements

Home energy management

The device provides homeowners with an intuitive way to monitor and optimize their energy usage.

By offering real-time insights into the power consumption of individual appliances or entire circuits, the device helps users identify high-energy-consuming devices and adjust their habits to reduce energy costs. For instance, monitoring the energy usage of heating or cooling systems can reveal opportunities to implement more efficient schedules. Additionally, the device’s local automation capabilities allow homeowners to create rules that automatically shut off unnecessary appliances during periods of peak consumption, ensuring smarter and more efficient energy usage without compromising convenience.

Cost optimisation for businesses

Businesses and commercial spaces benefit greatly from the precision and flexibility of the device.

Designed to track energy usage across three independent circuits, it enables business owners to monitor specific machines, departments, or processes. This granular level of tracking allows more accurate allocation of energy costs, helping to identify inefficiencies or excessive energy use.

With detailed consumption data readily available, businesses can plan operational improvements, reduce overhead costs, and ensure energy efficiency across their facilities.

Solar energy monitoring

The device is an ideal solution for those using photovoltaic (PV) systems to harness solar power.

By monitoring both energy production and consumption, users can ensure their solar panels are functioning at peak performance. The device helps users track the alignment between energy generation and usage, allowing them to optimize their consumption patterns during periods of high solar output.

For instance, homeowners can schedule energy-intensive tasks, such as charging an electric vehicle or running large appliances, during peak daylight hours to minimize dependency on the grid. For those aiming to maximize their investment in renewable energy, The device provides the insights needed to make every watt count.

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⚠️Caution - Read Before Buying⚠️

• Before beginning the installation, please read this guide and any other documents accompanying the device carefully and completely
• Danger of electrocution. The mounting/installation of the device should be performed by a qualified person (electrician)
• Failure to follow the installation procedures could lead to malfunction, danger to your health and life, violation of the law or refusal of legal and/or commercial guarantee (if any)
• Allterco Robotics (makers of Shelly products) and Mann Enterprises LTD are not responsible for any loss or damage in case of incorrect installation or improper operation of this device due to failure to follow the user and safety instructions in the printed guide accompanying this product (also available in the resources section below)
• Do not connect the device to appliances exceeding the given max load.
• Use the device only with a power grid and appliances which comply with all applicable regulations. Short circuit in the power grid or any appliance connected to the device may damage the device.
• Before starting, wire check that the breakers are turned off and there is no voltage on their terminals. This can be done with a phase meter or multimeter. When you are sure that there is no voltage, you can start wiring the cables.

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Features

• 4-quadrant measurement
• Multiple connection types: three phase or single phase installations
• Non-contact current measurements through current transformers
• Phase sequence error detection (option)
• No load threshold
• Optical pulse indication of energy usage
• Real-time clock: stored data keeps correct timestamps even if the internet connection is interrupted.
• Data logs: up to 7 days of data stored on the device for later retrieval
• Accuracy Class B (IEC 62053-21)
• Photovoltaic ready

Specifications

Size (HxWxD)	31x54x42 mm (without the wire)
Weight	52 g (including the wire)
Conductor aperture	Ø8 mm / Ø0.3″
Mounting	Above or under DIN-rail mounted circuit breakers
Shell material	Plastic
Shell colour	White
Ambient working temperature	-20 °C to 40 °C
Humidity	30 % to 70 % RH
Max. altitude	2000 m
Power supply	220-240 V~ 50/60 Hz (between LA and N)
Power consumption	< 2 W
External protection	63 A, tripping characteristic B or C, 6 kA interrupting rating, Energy limiting class 3
Internal temperature sensor	Yes
Voltmeters (RMS for each phase)	220-240 V~ 50/60 Hz
Voltmeters accuracy	Better than ±1%
Ammeters (RMS via integrated CT for each phase)	0 - 63 A (130 A saturation)
Ammeters accuracy	±1 % (2 - 63 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
No load threshold	30 VA
Measurement data storage	At least 7 days of 1 min data resolution
Data export	CSV for PQ recorded values JSON format export through RPC
Wi-Fi protocol	802.11 b/g/n
Wi-Fi RF band	2401 - 2483 МHz
Wi-Fi max. RF power	< 20 dBm
Wi-Fi range	Up to 30m indoors and 50m outdoors (Depends on local conditions)
Bluetooth protocol	4.2
Bluetooth RF band	2400 - 2483.5 MHz
Bluetooth max. RF power	< 4 dBm
Bluetooth range	Up to 10m indoors and 30m outdoors (Depends on local conditions)
Microcontroller unit
CPU	ESP-Shelly-C38F
Flash	8 MB
Firmware capabilities
Schedules	20
Webhooks (URL actions)	20 with 5 URLs per hook
Scripting	Yes
MQTT	Yes

Resources

• Shelly Product Documentation
• Printed User Guide (as found within the package)
• Declaration of Conformity
• Device Identification
  • Device name: Shelly 3EM-63T Gen3 (Flat terminal model)
  • Device number: S3EM-003CXCEU63
  • Device SSID: Shelly3EM63G3-XXXXXXXXXXXX
  • BLE model ID: 0x1026
• EAN: 3800235261941

Handy Shelly Resources

• Shelly Cloud
• Shelly App
  • Apple App Store
  • Google Play
  • Huawei AppGallery
• Home Assistant Shelly Integration
• Shelly Community Forum
• Shelly Facebook Support Group
• Shelly Knowledgebase
• Shelly Device Finder (easy-to-use software to find Shelly devices in the local network)
• Shelly Developer API

Package Contents

• 1x Shelly 3EM-63T Gen3 - Single or Three-Phase Energy Meter
  • T = Flat terminal version