REF620 ANSI Feeder Protection and Control Product Guide

This document is a product guide for the ABB REF620 ANSI, a dedicated feeder IED (Intelligent Electronic Device) from the Relion 620 series, designed for protection, control, measurement, and supervision of utility substations and industrial power systems. It details the device's standard configurations, protection functions (including overcurrent, arc flash detection, and cable fault detection), control features, communication protocols (IEC 61850, DNP3, Modbus), and technical specifications.