REF 541, REF 543, REF 545 Feeder Terminal Product Guide

This document is a product guide for ABB’s Feeder Terminal series (REF 541, REF 543, REF 545), detailing features for protection, control, measurement, and supervision of medium voltage networks. It covers functions such as overcurrent and earth-fault protection, power quality measurement, condition monitoring, communication interfaces, and support for IEC 61850 and Profibus-DPV1 protocols.