Shelly Pro 3EM-3CT63

Device identification

Name: Shelly Pro 3EM 3CT63

Model: SPEM-003CEBEU63

Device SSID: ShellyPro3EM3CT63-XXXXXXXX

BLE Model ID: 0x1025

Short description

Shelly Pro 3EM 3CT63 is a professional single or three-phase DIN rail–mountable energy meter with
enhanced Gen2 firmware flexibility and LAN connectivity. It supports Modbus, MQTT, HTTP, and WebSocket
with TLS for secure integration into industrial and smart energy monitoring systems. The device measures
and reports accumulated energy, voltage, current, active and apparent power in real time for each phase/channel
and stores up to 60 days of data in 1-minute intervals in non-volatile memory.
A built-in real-time clock ensures accurate data logging even during network outages.



Note: The device does not include a built-in relay. Contactor control is available using the
Shelly Pro 3EM Switch Add-on.

Main features

• 4-quadrant measurement (active, reactive, apparent power)
• DIN rail mountable
• Supports both three-phase and single-phase installations
• Non-contact current measurements through current transformers
• Phase sequence error detection* (optional)
• Channel-to-channel calibration**
• No-load threshold***
• Optical pulse indication of energy usage
• Built-in real-time clock with offline timestamp synchronization****
• Data logging for up to 60 days in 1-minute intervals
• External contactor control via Shelly Pro 3EM Switch Add-on
• Accuracy Class B (IEC 62053-21)
• Photovoltaic-ready

* Detects phase order errors by monitoring zero-crossing sequences.

** Minimum load of 500 W required per channel.

*** Below 30 VA per channel, power is displayed but not accumulated in statistics.

**** Internal RTC maintains correct timestamps during temporary network interruptions.

Use cases

• Industrial power distribution: Continuous three-phase current monitoring for energy optimization and fault detection.
• Commercial buildings: Compact CT design for precise current measurement in space-constrained panels.
• Motor control centers (MCCs): Mounted over breakers to track motor load and predict maintenance.
• Data centers: Real-time power tracking for critical equipment and infrastructure monitoring.
• Renewable energy installations: CT monitoring for solar or wind systems to ensure accurate current flow readings.
• Substation monitoring: Compact form factor for efficient current tracking and power stability.
• Building management systems (BMS): Real-time data for demand response and smart energy control.
• Power quality monitoring: Ensures clean power delivery for sensitive electronic and medical systems.
• 
  

Physical

Size (HxWxD): Shelly Pro 3EM-3CT63: 94×19×69 mm / 3.70×0.75×2.71 in; Shelly 3CT63: 14×54×26 mm / 0.55×2.12×1.02 in

Weight: Shelly Pro 3EM-3CT63: 62 g / 2.19 oz; Shelly 3CT63: 32 g / 1.12 oz

Screw terminals torque: 0.4 Nm (3.5 lbf·in)

Conductor size: Shelly Pro 3EM-3CT63: 0.5–2.5 mm² (20–14 AWG); Shelly 3CT63: 0.2–2.5 mm² (24–14 AWG; solid, stranded, and bootlace ferrules)

Strip length: 6–7 mm (0.24–0.28 in)

Mounting: Shelly Pro 3EM-3CT63: DIN rail; Shelly 3CT63: Freestanding on phase wires

Conductor aperture (Shelly 3CT63): Ø9 mm / Ø0.35 in

Shell material: Plastic

Shell color: White

Environmental

Ambient temperature: −20 °C to 40 °C (−5 °F to 105 °F)

Humidity: 30–70% RH

Max altitude: 2000 m (6562 ft)

Electrical

Power supply: 100–260 V~ 50/60 Hz

Power consumption: < 3 W

External protection: Tripping characteristic B or C; 16 A 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 & 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 at 1 min data resolution

Data export: CSV for PQ recorded values; JSON format export via RPC

Radio

Wi-Fi protocol: 802.11 b/g/n

Wi-Fi RF band: 2400–2495 MHz

Wi-Fi max RF power: < 20 dBm

Wi-Fi range: Up to 30 m / 100 ft indoors; 50 m / 160 ft outdoors (depends on conditions)

Bluetooth protocol: 4.2

Bluetooth RF band: 2400–2483.5 MHz

Bluetooth max RF power: < 4 dBm

Bluetooth range: Up to 10 m / 33 ft indoors; 30 m / 100 ft outdoors (depends on conditions)

MCU

CPU: ESP32-D0WDQ6

Flash: 16 MB

Firmware capabilities

Webhooks: 20 (up to 5 URLs each)

Scripting: Yes

MQTT: Yes

Encryption: Yes