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abb.com· Archivo PDFADVAC, AMVAC Integrated Racking Mechanism (BBR) Product WEB5 kV – 38 kV breakers (note: 38kV breaker truck connection on lower right of breaker assembly) • Low energy consumption (max 63 W) for reduced battery bank sizing • Mechanical clutch allows manual racking with no resistance • Limit switches and mechanical stops to ensure operation.