ABB REF543 Feeder Terminal

Overview

The ABB REF543 is a multifunctional feeder terminal for medium-voltage power distribution. It actively protects, controls, measures, and monitors electrical feeders. Moreover, it adapts to various switching devices and network types, including unearthed, arc-suppression coil-earthed, and partially earthed systems. It also protects medium-sized three-phase asynchronous motors and reactive power capacitor banks. The REF543 integrates easily into substations and industrial networks, providing reliable feeder supervision and control.

Technical Specifications

Auxiliary Voltage

• 24–250 V DC

• 110–240 V AC

Digital Inputs

• Multiple configurable binary inputs

Analog Inputs

• Supports RTD and analog modules

Communication Protocols

• DNP3.0, Modbus, IEC 61850, Profibus-DPV1, LON

Display Interface

• Front panel HMI with LED indicators

• Fixed LCD shows 19 lines (17 main + 2 auxiliary)

• Supports external LCD via CAN bus

Mounting Options

• Panel or rack mount

• Dimensions: 28 mm × 129 mm × 74 mm

Weight and Protection

• Weight: 7.7 kg

• Protection class: IP20

Measurement & Fault Detection

• Measures voltage/current via transformers, sensors, or dividers

• Locates short-circuit faults across network types

IEC 61850 Support

• Compatible through SPA-ZC 400 adapter

Digital and Relay Outputs

• 25 binary inputs

• 18 output relays