Product Overview

The REF542plus is a high-performance, multipurpose feeder terminal and digital bay control module engineered for medium-voltage power distribution systems. Designed by ABB, the REF542plus serves as a comprehensive protection, control, and monitoring hub, integrating high-speed microprocessor technology with flexible logic programming. It is optimized for a diverse range of applications, including feeder, transformer, and motor protection. By utilizing the Function Plan (FUPLA) programming environment, the REF542plus allows for precise customization of protection schemes and interlocking logic, ensuring high-tier reliability in modern substation automation and industrial power grids.

Detailed Technical Specifications

• Manufacturer: ABB

• Model Designation: REF542plus

• Device Type: Digital Bay Control and Protection Unit

• Primary Function: Feeder Management, Transformer, and Motor Protection

• Auxiliary Power Supply: 24–250 V DC / 48–240 V AC (Configuration dependent)

• Rated Current Input: 1 A or 5 A (Software/Hardware configurable)

• Rated Voltage Input: Standard 100 V / 110 V AC (Compatible with high-precision sensors)

• Protection Logic: Overcurrent (Phase/Earth), directional earth-fault, voltage, frequency, and thermal overload

• Measurement Accuracy: Real-time current, voltage, frequency, power, and energy monitoring

• Digital I/O Capacity: Multiple configurable channels for local interlocking and remote signaling

• Communication Protocols: IEC 61850, Modbus RTU, IEC 60870-5-103

• Interface: Integrated LCD display with keypad for local HMI monitoring and configuration

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

• Ingress Protection: IP20 (Rear), IP54 (Optional front panel protection)

• Mounting: Panel-flush mount

• Dimensions: 190 mm x 170 mm x 200 mm

• Shipping Weight: 5.0 kg (3 kg net weight)

• Compliance: IEC, CE Standards