REF620 V2.0 ANSI Protective Relay Single Line Diagram and AC Schematic

This document provides a typical single line diagram and AC schematic for the ABB REF620 V2.0 ANSI protective relay, detailing its functional application in distribution feeder protection. It includes relay order codes, input/output assignments, breaker failure and arc flash trip logic, VT/CT connection configurations, and parameter settings for ground and polarizing signal selection.