MCX912/913 Multifunctional Protection Relay Manual

This document describes the ABB Power Automation MCX912/913 multifunctional microprocessor-controlled relay, designed for protection of rotating AC machines, transformers, and line/cable feeders. It details the relay's features, including thermal replica, short-circuit, overcurrent, earth fault, negative phase sequence, and motor starting protection, along with its setting and self-monitoring capabilities.