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GCB transformer maintenance vacuum

HB3-C Flyer - Vacuum generator circuit-breaker Type HB3-C· PDF filevacuum technology performance • Maintenance free vacuum technolo-gy with up to 10,000 CO operating cycles at full nominal rated current • Features full-spring operating mechanism stated to be the most reliable* way to operate a GCB with lifespan up to 20,000 CO operation • Equipped with sealed-for-lifetime** vacuum interrupter

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