Shelly Pro 3EM-400A
£249.99
1 in stock
Overview
Shelly Pro 3EM-400A is a professional DIN-rail-mountable three-phase energy meter designed for very high-current installations up to 400A per phase. Built on Gen2 firmware with LAN, Wi-Fi, and Bluetooth connectivity, it provides real-time monitoring of voltage, current, power, and power factor per phase, along with four-quadrant energy measurement. With photovoltaic readiness, high measurement accuracy, and local data storage, Shelly Pro 3EM-400A is ideal for commercial, industrial, and large residential energy monitoring.
Key features
- DIN-rail-mountable three-phase energy meter
- Measures up to 400A per phase and neutral
- Four-quadrant energy measurement with multiple wiring options
- Real-time voltage, current, power, and power factor per phase
- Accuracy Class B active energy (IEC 62053-21, manufacturer tested)
- Photovoltaic-ready for monitoring energy production and consumption
- Phase sequence error detection
- Optical pulse indication of energy usage
- Local data storage for up to 60 days at 1-minute resolution
- LAN, Wi-Fi, and Bluetooth connectivity
- Supports scripting, MQTT, and advanced automation
Product information
Use cases
- Three-Phase Energy Monitoring
- Monitor real-time and historical energy usage across high-current three-phase electrical systems.
- Solar and Energy Generation Tracking
- Track photovoltaic energy production and bidirectional energy flow in large installations.
- Commercial and Industrial Installations
- Deploy in factories, commercial buildings, and industrial sites requiring high-current monitoring.
- Energy Auditing and Optimisation
- Store and export detailed energy data for analysis, reporting, and optimisation.
Technical specifications
Physical
Size (HxWxD)
94 × 19 × 69 mm (±0.5 mm)
Weight
62 g (±1 g)
Mounting
DIN rail
Shell material
Plastic
Colour
White
Environmental
Ambient temperature
-20°C to +40°C
Humidity
30% to 70% RH
Max altitude
2000 m
Electrical
Power supply AC
110–240 V, 50/60 Hz
Power supply DC
N/A
Power consumption
< 3 W
Sensors and Meters
Temperature sensor
Yes
Voltmeters (RMS per phase)
100–260 V
Voltmeter accuracy
±1 %
Ammeters (RMS via CT)
0–400 A per phase and neutral
Ammeter accuracy
±1 % (5–400 A), ±2 % (0–5 A)
Power and energy measurement
Active and apparent power, active and apparent energy, power factor, fundamental active and reactive energy
No-load threshold
30 VA per phase
Measurement data storage
At least 60 days at 1-minute resolution
Data export
CSV (PQ values), JSON via RPC
Radio
RF band
2400–2495 MHz
Max RF power
< 20 dBm
Wi-Fi protocol
802.11 b/g/n
Wi-Fi range
Up to 30 m indoors / 50 m outdoors
Bluetooth protocol
4.2
Bluetooth range
Up to 10 m indoors / 30 m outdoors
MCU
CPU
ESP32-D0WDQ6
Flash
16 MB
Firmware Capabilities
Webhooks (URL actions)
20 (5 URLs per hook)
Scripting
mJS
MQTT
Yes
CoAP
No
What’s included
- Shelly Pro 3EM energy meter
- 3 × 400A current transformer clamps
