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MCX 912 and MCX 913 Multifunction Relay Operating Instructions

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This document provides operating instructions for ABB Power Automation's multifunction relays, models MCX 912 and MCX 913, covering protection functions, settings determination, installation, and wiring. It includes detailed guidance on configuring phase fault, overcurrent, earth fault, thermal overload, and negative phase-sequence protection, along with setting examples for motors and power transformers.

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