Product Overview

The REU610 is a high-precision numerical voltage protection relay from the ABB Relion family, engineered for the comprehensive monitoring and protection of medium-voltage power distribution networks. This module is specialized in detecting voltage-based abnormalities, providing critical overvoltage, undervoltage, and residual overvoltage protection. By ensuring rapid fault isolation and deterministic performance, the REU610 safeguards transformers, motors, and busbar systems from potentially damaging voltage fluctuations. Its compact design and multi-protocol communication support make it an essential Intelligent Electronic Device (IED) for modern substation automation and industrial power management.

Detailed Technical Specifications

• Manufacturer: ABB

• Model: REU610

• Device Type: Numerical Voltage Protection Relay

• Protection Functions: Overvoltage (3-phase), undervoltage (3-phase), and residual overvoltage protection

• Rated Voltage Input: Up to 110 V AC (Secondary side VT connection)

• Nominal Frequency: 50 / 60 Hz (Configurable)

• Auxiliary Power Supply: Universal wide-range 24–250 V DC or 48–240 V AC

• Binary Inputs/Outputs: Multiple programmable digital I/O for signaling and trip logic

• Communication Protocols: Modbus RTU, IEC 60870-5-103, and SPA bus

• Monitoring & Recording: Built-in disturbance recorder and detailed event logs for fault analysis

• Human-Machine Interface (HMI): Front-panel LCD display with navigation push buttons

• Operating Temperature: -25°C to +70°C

• Storage Temperature: -40°C to +85°C

• Dimensions (WxHxD): 160 mm x 180 mm x 200 mm

• Weight: 2.5 kg

• Mounting Configuration: Panel-flush mount

• Protection Degree: IP20 (Rear terminals); higher front panel protection with standard installation

• Standards Compliance: IEC 60255 series for power system protection