Relion 605 REJ603 Self-Powered Feeder Protection Relay Product Guide

This document is a product guide for the ABB Relion 605 series REJ603 self-powered feeder protection relay, designed for secondary distribution networks in utilities and industries. It details the relay's protection functions, including non-directional overcurrent and earth-fault protection with selectable time characteristics, as well as its application in Ring Main Units and unmanned substations where auxiliary power is unavailable.