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VD4/S and VD4/UNIAIR Vacuum Circuit Breaker Circuit Diagram

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This document is a detailed circuit diagram for ABB VD4/S and VD4/UNIAIR series vacuum circuit breakers, specifically for models equipped with an electric operating mechanism and a REF601 or REF601/CEI 0-16 protection relay. It includes wiring schematics, terminal designations (XB1, XB3, etc.), and component references for installation, maintenance, and troubleshooting of the switchgear.

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