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3AH4 Vacuum Circuit-Breakers - Siemens· PDF file3AH4 Vacuum Circuit-Breakers · Siemens HG 11.04 · 2018 9 Description Maintenance, ambient conditions, current carrying capacity and dielectric strength Maintenance The 3AH4 vacuum circuit-breakers are maintenance-free up to 10,000 operating cycles under normal ambient conditions according to IEC 62271-1. After that, maintenance is to

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