REJ 525 Overcurrent and Earth-Fault Relay Product Guide

This document is a product guide for the REJ 525 overcurrent and earth-fault relay, detailing its protection features such as three-phase low-set and high-set overcurrent stages, earth-fault stages, phase discontinuity protection, circuit-breaker failure protection, and a disturbance recorder. It also covers communication protocols (IEC 60870-5-103, SPA bus), HMI with alphanumeric LCD, configurable output contacts, and self-supervision capabilities.