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REJ 521 Earth-Fault Relay Product Guide

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This document is a product guide for the REJ 521 earth-fault relay, detailing its features such as low-set and high-set non-directional earth-fault protection stages, circuit-breaker failure protection, and a disturbance recorder. It also covers communication protocols, HMI with alphanumeric LCD, self-supervision, and configurable output contacts.

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