ABB REX521GHHPSH50G Integrated Protection Relay

Overview

The ABB REX521GHHPSH50G is a high-performance protection relay for medium-voltage power systems. ABB designed it to protect feeders, transformers, and other critical equipment. It integrates advanced protection, control, and monitoring in one compact unit. Moreover, its support for multiple communication protocols makes it ideal for modern digital substations and industrial networks.

Technical Specifications

Protection Functions

• Overcurrent

• Earth fault

• Over/under voltage

• Frequency protection

• Voltage imbalance

Measurement Capabilities

• Voltage, Current, Power, Power factor, Harmonics

Control Functions

• Circuit breaker control

• Auto-reclosing (up to 5 shots)

Monitoring Features

• Trip circuit supervision

• Breaker wear monitoring

• Harmonic distortion analysis

• Event logging

User Interface

• Multilingual LCD display

• Clear-text messaging

I/O and Performance

• I/O Capacity: Up to 256 points via expansion

• Cycle Time: <1 ms (standard), 0.1 ms (high-speed)

Power and Frequency

• Input Voltage: 220 V AC

• Output Frequency: 30 kHz

• Power Consumption: ≤5 W

Environmental and Mechanical

• Operating Temperature: –20°C to +60°C

• Enclosure Rating: IP20 standard, optional IP65

• MTBF: 120,000 hours (IEC 61730)

• Dimensions: 148.8 × 265.9 × 235 mm

• Weight: 0.9 kg