Technical Specifications

Complete technical specifications of the RE-431 series (rev. 1.5). The official datasheet can be downloaded in PDF format:

📄 Download datasheet (EN) — PDF📄 Scarica datasheet (IT) — PDF

General Specifications

Parameter	Description
Network Type	1P + N · 2P + N · 3P + N WYE (Y)
Sampling Rate	8 kSPS
Measurements	Total and fundamental Active Power (W), Reactive (VAR), Apparent (VA); Active (kWh), Reactive (kVARh), Apparent (kVAh) energy; total and fundamental IRMS and VRMS; total harmonic distortion (THD); power factor. Active energy: IEC 62053-21/22, EN 50470-3, OIML R46, ANSI C12.20. Reactive energy: IEC 62053-23/24.
Display	2.0" active matrix TFT, 320 × 240 pixels, 65K colors
Real Time Clock	NTP synchronized, accuracy ±1 ppm @ 25 °C
Data and Event Logging	Online and onboard real-time data and event logging

Power Inputs

Parameter	Description
Number of Inputs	2 inputs: Phase and Neutral
Voltage Range	90–300 VAC
Frequency Range	50–60 Hz
Max. Current	0.15 A
Overcurrent Protection	Internal fuse (1 A, 350 V AC)
Overvoltage Protection	Internal MOV + GDT

Voltage Inputs

Parameter	Description
Number of Inputs	4 inputs: 3 Phases and Neutral
Max. Voltage Input	300 V L-N
Measurement Category	300 V CAT III
Overcurrent Protection	Internal fuse (1 A, 350 V AC)
Overvoltage Protection	Internal MOV + GDT

Current Inputs

Parameter	Description
Number of Inputs	4 inputs: 3 Phases and Neutral
Input Type	Current Transformers (CT) · Rogowski Coils
Compatible CTs	75A:0.1A Ø10mm · 150A:0.1A Ø16mm · 300A:0.1A Ø24mm · 600A:0.1A Ø36mm · 1200A:0.1A Ø90mm · 2500A:0.1A Ø120mm
Compatible Rogowski	1000A Ø120mm · 2000A Ø190mm · 3000A Ø300mm

Accuracy

Parameter	Description
Voltage	0.2 %
Power Factor	± 0.001
Active / Apparent Power	Class 0.2
Reactive Power	Class 0.2
Frequency	0.05 % from 45 to 65 Hz
Active Energy	Class 0.2
Reactive Energy	Class 0.2

Power Quality Analysis

Parameter	Description
Class	IEC 61000-4-30 Class S
Measurement	VRMS½ / IRMS½ (refreshed each half cycle) · 10/12 cycle RMS · voltage and current unbalance · zero crossing · phase angle
Anomalies Detection	Dip and Swell monitor · event waveform capture · zero-crossing timeout
Line Frequency	One per phase
Harmonics Analysis	Individual harmonic magnitudes on voltage and current, up to the 63rd harmonic
Harmonics Distortion	Voltage (VTHD) · Current (ITHD)
Waveform	Capture on all voltage and current inputs (including Neutral)

Mechanical

Parameter	Description
Dimensions (L×W×H)	70 mm × 91 mm × 59 mm
DIN-Rail Size	4M
Weight	0.210 kg
Degree of Protection	IP40 front panel · IP20 body (conforming to IEC 60529)

Safety

Parameter	Description
General	CE as per IEC 61010-1 (double insulation)
Pollution Degree	2
Overvoltage Category	OVC III (5000 m)
Operating Altitude	Up to 5000 m
RS485 Insulation	5.7 kV reinforced insulation

Environment

Parameter	Description
Operating Temperature	-40 °C to +65 °C
Humidity Rating	5–95 % RH at 50 °C (non-condensing)
Pollution Degree	2

Cybersecurity

Parameter	Description
Data Encryption	MQTT data transfer over TLS
Flash Encryption	AES-XTS-based flash encryption
User Access	Strong password enforcement
Event Logging	Security events logging via Syslog
Secure Boot	RSA-based secure boot
Services	Unused services and ports can be disabled
Wi-Fi	Protected Management Frames (PMF) support
Conformity	Compliant with EN 18031-1 and Delegated Regulation (EU) 2022/30 (RED)

Communication & current inputs by variant

Model	Wi-Fi	Bluetooth	MQTT	Modbus TCP/IP	Modbus RTU	LoRaWAN	Ethernet	CT Split Core	Rogowski	ZigBee
RE-431-D	●	●	●	●				●
RE-431-D-RS485	●	●	●	●	●			●
RE-431-D-LW	●	●	●	●		●		●
RE-431-D-ETH	●	●	●	●			●	●
RE-431-D-ROG	●	●	●	●					●
RE-431-D-ZB	●	●	●	●				●		●