Specifications

For the complete datasheet (rev. 1.5) and the PDF download, see the Technical Specifications page.

Models

Models
Models	Model	Communication
	RE-431-D	Wi-Fi, Bluetooth LE, Modbus TCP
	RE-431-D-RS485	Wi-Fi, Bluetooth LE, Modbus TCP, Modbus RTU (RS485)
	RE-431-D-LW	Wi-Fi, Bluetooth LE, Modbus TCP, LoRaWAN

Electrical Characteristics

General Specifications
General Specifications	Parameter	Description
	Network Type	1P + N, 2P + N, 3P + N WYE (Y); selectable 50/60 Hz
	Sampling Rate	8 kSPS
	Measurements	Active Power (W), Reactive Power (VAR), Apparent Power (VA), Active Energy (kWh), Reactive Energy (kVARh), Apparent Energy (kVAh), IRMS, VRMS, Power Factor, Frequency, THD Imported/exported energy counters, total and per phase Compliant with EN 50470-1, EN 50470-3, IEC 62053-21, IEC 62053-22, and IEC 62053-23 standards
	Display	2.0″ active matrix TFT, 320 × 240 pixels, 65K colors
	Real-Time Clock	NTP synchronized. Time accuracy: ±1 ppm @ 25°C
	Data and Event Logging	Online and onboard real-time data and event logging

Power Inputs
Power Inputs	Parameter	Description
	Number of Inputs	2 inputs: Phase and Neutral (shared with Voltage Inputs)
	Voltage Range	90–300 VAC
	Frequency Range	50–60 Hz
	Maximum Current	0.15 A
	Overcurrent Protection	Internal Fuse (1 A, 350 VAC)
	Overvoltage Protection	Internal MOV + GDT

Voltage Inputs
Voltage Inputs	Parameter	Description
	Number of Inputs	4 inputs: 3 Phases and Neutral (L1, L2, L3, N)
	Maximum Input Voltage	300 V L-N
	Measurement Category	300 V CAT III
	Overcurrent Protection	Internal Fuse (1 A, 350 VAC)
	Overvoltage Protection	Internal MOV + GDT

Current Inputs
Current Inputs	Parameter	Description
	Number of Inputs	4 inputs: 3 Phases and Neutral
	Input Type	External Current Transformers (CTs) / Rogowski Coils
	Maximum Input Current	0.1 A
	Current Transformer	Selectable ratio (75 A…2500 A : 0.1 A). Rogowski coils up to 3000 A

Accuracy
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

Mechanical Characteristics

Mechanical
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, compliant with IEC 60529 IP20 enclosure, compliant with IEC 60529

Environmental Characteristics

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

Safety and Standards

Safety
Safety	Parameter	Description
	General Compliance	CE compliant according to 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 (RE-431-D-RS485)
	Conformity	EN 18031-1 and Delegated Regulation (EU) 2022/30 (RED)

Communication

Communication
Communication	Parameter	Description
	Wi-Fi	2.4 GHz Wi-Fi (802.11 b/g/n)
	Bluetooth	Bluetooth® 5 (LE)
	Modbus TCP	Modbus TCP/IP (all models)
	Modbus RTU	RS485, configurable (RE-431-D-RS485 only)
	LoRaWAN	RE-431-D-LW only
	MQTT	MQTT Client MQTTs Client (TLS-encrypted)
	RS485 Insulation	5.7 kV reinforced insulation (RE-431-D-RS485 only)

Cybersecurity

Cybersecurity
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 event logging via Syslog
	Secure Boot	RSA-based secure boot
	Services	Unused services and ports can be disabled
	Wi-Fi	Protected Management Frames (PMF) support