1. Electricity - Electronics
  2. Switch and Relay
  3. Vacuum circuit breaker
  4. Siemens Medium-voltage – Power distribution

Vacuum circuit breaker 3AH3

vacuum circuit breaker
vacuum circuit breaker
vacuum circuit breaker
vacuum circuit breaker
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Electrical characteristics
short-circuit, high-power, medium-voltage
Operating mode
Number of poles
Other characteristics
Primary current

Max.: 8,000 A

Min.: 1,250 A


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.
*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.