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VD4 Series Vacuum Circuit Breaker Circuit Diagram

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This document is a detailed circuit diagram for ABB VD4 series vacuum circuit breakers (VD4/R, VD4/UNIAIR-F, VD4/UNIMIX-F) equipped with an electric operating mechanism and a REF601 or REF601/CEI 0-16 relay. It provides wiring connections, terminal designations (XB, BS, OB, MS, MC, MU), and component references for installation, commissioning, and maintenance of the apparatus.

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