Professional Smart Meter

Shelly Pro 3EM-3CT63 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. It has a real-time clock to keep the correct time if the connection to an SNTP server is lost.

Measure with confidence

Shelly Pro 3EM-3CT63 comes with a specially designed by Shelly 3-phase current transformer. This small yet powerful CT measures up to 63A, making it perfect for accurate energy monitoring. It’s easy to install on a DIN rail, saving space in your electrical panel. With Shelly’s design, you get reliable performance and simple energy management.

LAN, Wi-Fi, and Bluetooth connectivity

LAN connection for high security and reliability. Simultaneous Wi-Fi and LAN usage, as backup when needed.

4-quadrant measurement

Measure capacitive and inductive load types of active imported and exported energies.

Accuracy class B (active energy)

Shelly Pro 3EM-3CT63 has a measurement accuracy of 1%.

Energy measurement

Monitors mono-phase electrical systems with up to 3 points simultaneously. Fast notifications and at least 60 days of 1-minute records storage.

MODBUS support

Allows for easy and fast deployment in existing industrial installations.

Scripting functionalities

Shelly Pro 3EM-3CT63 fully supports mjS scripting, allowing you to create further features and functionalities.

Note : This device does not have a built-in relay. Contactor control is provided using a Shelly Pro Addon attached to the Shelly Pro 3EM-3CT63.

Features of Shelly Pro 3EM-3CT63

• 4 Quadrant measurement
• DIN rail mounting
• Multiple connection types: Three phase or single phase installations
• Current transformer connection: Non-contact measurements.
• 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 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
• Photovoltaic ready

Technical specifications of Shelly Pro 3EM-3CT63

• Physical
• Size (HxWxD):
• Shelly Pro 3EM-3CT63: 94x19x69 mm
• Shelly 3CT63: 14x54x26 mm
• Weight:
• Shelly Pro 3EM-3CT63: 62 g
• Shelly 3CT63: 32 g
• Screw terminals max torque: 0.4 Nm
• Conductor cross section:
• Shelly Pro 3EM-3CT63: 0.5 to 2.5 mm² / 20 to 14 AWG
• Shelly 3CT63: 0.2 to 2.5 mm² / 24 to 14 AWG (solid, stranded, and bootlace ferrules)
• Conductor stripped length: 6 to 7 mm
• Mounting:
• Shelly Pro 3EM-3CT63: DIN rail
• Shelly 3CT63: Freestanding on phase wires
• Shell material: Plastic
• Shell color: White
• Environmental
• Ambient working temperature: -20°C to 40°C 
• Humidity: 30% to 70% RH
• Electrical
• Power supply: 100-260 V~ 50/60 Hz
• Power consumption: < 3 W
• External protection: Tripping characteristic B or C, 16A max. rated current, min. 6 kA interrupting rating, energy limiting class 3
• Shelly 3CT63 electrical strength: 1000 V~, 60 sec
• Sensors, meters
• Internal-temperature sensor: Yes
• Voltmeter (AC): 100 - 260 V
• Voltmeter accuracy: ±1 %
• Ammeter (AC): 0 - 63 A
• Ammeter accuracy: ±1 % (2 - 63 A), ±2 % (1 - 2 A), ±5 % (0 - 1 A)
• Compatible current transformers: 3CT63
• 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
• Wi-Fi
• Protocol: 802.11 b/g/n
• RF band: 2400 - 2495 МHz
• Max. RF power: < 20 dBm
• Range: Up to 30 m indoors and 50 m outdoors (Depends on local conditions)
• Bluetooth
• Protocol: 4.2
• RF band: 2400 - 2483.5 MHz
• Max. RF power: < 4 dBm
• Range: Up to 10 m indoors and 30 m outdoors (Depends on local conditions)
• Microcontroller unit
• CPU: ESP32-D0WDQ6
• Flash: 16 MB