Relion BIO-Testers Application Manual

This document describes the Relion® BIO-Testers, which are tools designed for simulating and testing binary inputs and outputs of Relion® protection relays. It covers the testers' application across the relay's entire life cycle, including design simulation, commissioning, maintenance, troubleshooting, and replacement, and lists compatible relay models such as REX610, REM615, and REX640.