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High current switching
Available for up to 17.5 kV and withstanding fault currents up to 50 kA and continuous currents up to 4000 A.
Why 3AK7 vacuum circuit-breakers?
The Siemens 3AK7 vacuum circuit-breaker is the compact all rounder your medium voltage network has been waiting for. Engineered for special applications where performance, reliability and space efficiency matter, the 3AK7 covers generator switching per IEC/IEEE 62271-37-013, high current tasks and frequent switching operations — all within the same standardized external dimensions to simplify planning, spares and installation.
- up to 17.5 kV
- up to 50 kA
- up to 4000 A
- up to 30,000 operations
Key benefits
All-in-one
Simplify procurement and inventory by using one device for three applications.
Space saver
Free up switchgear room and accelerate retrofits.
Durability
Up to 30,000 switching operations with simple servicing.
Featured capabilities
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Generator switching
Type-tested according to IEC 62271-100 and the IEC/IEEE 62271-37-013 generator standard, the 3AK7 circuit-breaker is able to reliably interrupt demanding generator-source faults.
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Frequent switching operations
30,000 operating cycles ensure long service life even under demanding switching schedules.
Explore resources (in English)
Related content
IEC/IEEE generator switching
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3AH36/37/38
3AH36/37/38 are IEC/IEEE-tested generator circuit-breakers up to 500 MVA and 110 kA - providing trusted, low-maintenance and future-ready protection.