DC commutation switch 3AT — air-insulated DC switching device of the 3A circuit-breaker series (4th generation, 3AQ/3AT), commutation switching duty in HVDC schemes, detailed ratings on request
3AT DC Commutation
- Dedicated DC switch type in the manufacturer's switching-products hierarchy: AIS circuit breakers → DC switches → 3AT DC Commutation Switch
- Designation denotes commutation switching duty — current transfer between DC paths — in HVDC installations
- Built on the 3AT platform — 4th generation of the 3A air-insulated circuit-breaker series (alongside 3AQ), per the OEM maintenance brochure
- OEM-defined service sequence for the 3AQ/3AT generation: visual checks at 5 / 10 / 15 years, revision at 20 years
- Four-step OEM service scope: diagnostic testing, inspection, preventive maintenance and function testing, by certified technicians with original spares
- Ratings tables and scheme-specific application data available on request
DC-side commutation switching in HVDC installationsInstalled-base service and maintenance under the OEM 3A circuit-breaker service program
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Specifications
Documents & downloads
Brochure Maintenance of AIS 3A circuit breakers — service scope and timelines incl. the 3AQ/3AT generation (2023)
Datasheet 3AT DC commutation switch — technical data (available on request)
Also covered in the technical library
Brochure HVDC Classic – powerful and economical — High-performance power transmission
Ordered designations
Representative orderable type designations of this family — searchable via the catalog search.
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