vacuum circuit breaker / short-circuit / high-power / medium-voltage

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vacuum circuit breaker vacuum circuit breaker - 3AH3


  • Type:


  • Electrical characteristics:

    short-circuit, high-power, medium-voltage

  • Operating mode:


  • Other characteristics:


  • Current:

    Max.: 8,000 A

    Min.: 1,250 A

  • VAC:

    Max.: 40.5 kV

    Min.: 7.2 kV


The powerful 3AH3 vacuum circuit breakers were the first 63- and 72-kA vacuum circuit breakers on the market tested in accordance with IEEE C37.013 for load currents up to 12,000 A and short-circuit currents up to 100 kA. In addition to the standard designs, we can also offer phase-segregated versions with separate switching units. The low resistance in the main current path allows the 3AH3 vacuum circuit breaker to be used with operating currents of up to 6,300 A with no forced cooling, or up to 8,000 A with forced cooling. These modular vacuum circuit breakers can also be installed horizontally using special cooling elements and are suitable for retrofitting in existing systems.