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REF620 V2.0 ANSI Protective Relay Single-Line Diagram

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This document is a technical drawing set for an ABB REF620 V2.0 ANSI protective relay and associated switches, detailing a typical single-line diagram for breaker control and protection applications. It includes wiring and labeling for two circuit breakers (52-1 and 52-2), binary inputs/outputs, trip signals, breaker failure protection, and bus selection logic with general installation notes.

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