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REX521GHHGSH50G

The ABB REX521GHHGSH50G is a fully-configured, high-performance numerical protection and control relay from the ABB Relion® 650 series (REX521 line). This alphanumeric code is a positional ordering key that defines the exact hardware configuration of the device, including its power supply, communication interfaces, and input/output (I/O) modules. It is engineered for comprehensive protection, control, monitoring, and automation of medium-voltage feeders, transformers, and other critical assets in substations and industrial power systems.

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Parameter Category Specification Device Platform ABB Relion® 650 Series, REX521 Feeder Protection Relay Standard Compliance IEC 60255, IEC 61850 (Ed.2), IEEE C37.90 Rated Auxiliary Supply 48 - 250 V DC (Wide Range) Protection Functions Configurable via software. Standard library includes: • Directional/Non-directional Overcurrent (50/51, 67) • Directional/Non-directional Earth Fault (50N/51N, 67N) • Over/Under Voltage (27/59) • Over/Under Frequency (81) • Breaker Failure (50BF) • Thermal Overload (49) Analog Inputs • Current: At least 4 channels (3-phase + earth), 5A nominal. • Voltage: 3-phase voltage inputs (typically 100/110V line-to-line or phase-to-neutral) are standard. Binary Inputs (BI) Minimum 16 channels, 24-48V DC. Binary Outputs (BO/Relays) Minimum 8 channels, Form-C contacts. Communication Interfaces • Ethernet: At least 1 port (RJ45 or fiber) for IEC 61850, IEC 60870-5-104. • Serial: At least 1 RS485 port for Modbus RTU or IEC 60870-5-103. • Front Port: USB for local configuration. Human-Machine Interface Graphical LCD with keypad. LED indicators. Measurement & Metering High-accuracy measurement of I, V, P, Q, S, PF, f, kWh, kVARh. Class 0.5. Event & Disturbance Recording Event recorder (≥ 1000 events). Fault recorder (oscillography) capability. Configuration Software ABB PCM600 – Universal engineering tool for setting, logic configuration, and documentation. Typical Mounting Panel-mounted (4U height, 19-inch rack) or DIN rail mounting variant possible.