RER Bus Connection Module Selection Table for RED 500

This document provides selection tables for RER Bus Connection Modules compatible with RED 500 series protection devices, detailing supported communication protocols (DNP 3.0, Modbus, IEC 101/103, SPA, LON) and media types (fibre optic, FTT-10, RS-485) for various device ports. It also lists reference documents for related protection devices and bus connection modules, and notes that RER modules are not needed for the REX 521 device.