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SF6 transformer maintenance vacuum Siemens

3AH4 Vacuum Circuit-Breakers - Siemens· PDF fileThe vacuum circuit-breaker type 3AH4 up to 36 kV is designed for extremely high numbers of operating cycles: It controls 60,000/120,000 operating cycles. Minimum maintenance work, such as greasing of operating mechanisms after 10,000 operating cycles and replacement of vacuum interrupters after 30,000 operating cycles,

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