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HD4 Circuit-Breaker Kraus & Naimer Auxiliary Contact Replacement Instructions

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This document provides step-by-step instructions for replacing Kraus & Naimer auxiliary contacts in ABB HD4 circuit-breakers with ESH mechanical operating mechanisms, covering both fixed and withdrawable versions. It includes safety warnings, technical specifications, wiring instructions, disassembly procedures, and circuit diagrams for the auxiliary contact assembly.

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