Shelly 3EM-63W Gen3 – Wi-Fi Three-Phase Energy Meter with Integrated CTs
Overview
Shelly 3EM-63W Gen3 is a compact Wi-Fi-operated three-phase energy meter with integrated current transformers, designed to monitor energy consumption in three-phase systems or up to three independent single-phase circuits.
It provides precise real-time and historical energy data, including voltage, current, active and apparent power, power factor, and accumulated energy for each phase. With local operation, cloud connectivity, and advanced scripting support, it is suitable for both residential and professional energy monitoring applications.
The device features built-in data storage, an embedded web interface, Bluetooth for easy onboarding, and future-ready support for solar and grid monitoring scenarios.
Key Features
• Three-phase energy monitoring or 3 independent single-phase circuits
• Integrated current transformers (0–63 A per phase)
• Class B accuracy (IEC 62053-21) with 4-quadrant measurement
• Real-time monitoring of voltage, current, power, and energy
• Local data storage (up to 7 days at 1-minute resolution)
• Embedded web server for direct local access
• Wi-Fi operated – no hub required
• Bluetooth for fast inclusion and setup
• Local automation and full scripting support
• MQTT, HTTP, WebSocket, and REST API support
• Suitable for future solar and energy optimisation use cases
Technical Specifications
Power
Power supply: 220–240 V AC, 50/60 Hz (between LA and N)
Power consumption: < 2 W
Measurement
Voltage (RMS): 220–240 V AC
Voltage accuracy: ±1%
Current (RMS via integrated CT): 0–63 A (130 A saturation)
Current accuracy:
• ±1% (2–63 A)
• ±2% (1–2 A)
• ±5% (0–1 A)
No-load threshold: 30 VA
Measured values:
• Active & apparent power
• Active & apparent energy
• Power factor
• Fundamental active & reactive energy
Data & Storage
Consumption history: Minimum 7 days
Data resolution: 1-minute intervals
Data export:
• CSV (power quality values)
• JSON via RPC
Environmental
Operating temperature: -20°C to 40°C
Humidity: 30% to 70% RH
Connectivity
Wi-Fi protocol: 802.11 b/g/n (2.4 GHz)
Wi-Fi RF band: 2401–2483 MHz
Max Wi-Fi RF power: < 20 dBm
Wi-Fi range:
• Up to 50 m outdoors
• Up to 30 m indoors
Bluetooth: 4.2
Bluetooth range:
• Up to 30 m outdoors
• Up to 10 m indoors
Physical
Dimensions (H × W × D): 21 × 54 × 42 mm
Wire length: 260 mm (including flat terminal)
Installation Notes
• Designed for installation inside electrical cabinets
• Integrated CTs allow contactless current measurement
• Supports three-phase or multi-circuit single-phase setups
• Can operate fully locally without cloud dependency
• External protection recommended: 63 A, type B or C circuit breaker
In the Box
• Shelly 3EM-63W Gen3
• Integrated current transformer wires (63 W version)
• Installation documentation