Live-Tank outdoor vacuum circuit breakers

With our Live-Tank outdoor vacuum circuit-breakers, we provide reliable quality for all your medium-voltage network needs

Circuit-breakers form a most vital part of your medium-voltage network. They must make and break all currents within the scope of their ratings, from small inductive and capacitive load currents up to the short-circuit current, regardless of earth faults, phase opposition, etc. Outdoor vacuum circuit-breakers (OVCB) have to face even higher demands, with the additional influence of weather conditions. For its proven reliability, network operators around the world have chosen Siemens medium-voltage vacuum circuit-breakers for over 40 years, with over 350,000 vacuum circuit-breakers in service to date.

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Products to rely on

The right solutions for tomorrow’s intelligent networks

Siemens puts large effort into developing and manufacturing its medium-voltage circuit-breakers to the highest possible standards, enabling them to withstand the toughest climates and function reliably in practically every kind of environment.
Live-Tank 3AF0

The space saver

The Live-Tank 3AF0 is used for transformer substations and distribution grids, where it reliably switches off overhead lines. It excels with its light-weight and space saving compact design. Moreover, it is totally restrike-free and offers reliable operation through its spring stored-energy operating mechanism.

Due to their modular structure and lightweight components, our live-tank circuit breakers 3AF0 can easily be transported to their installation site. Their switching function is based on the same, well-proven components we use for our indoor circuit breakers. In addition, they can be optimally adapted to each application using current and voltage transformers. And since they contain very few moving parts, our live-tank circuit breakers 3AF0 are virtually maintenance-free.

The sealed pole design makes them suitable for all environments. In addition, all live-tank circuit breakers up to 40.5 kV conform to the new IEC 62271-100 (the new standard for circuit breakers) and all models have been type-tested at the independent KEMA laboratory in the Netherlands.

  • Capacitor and Reactor Switching
  • Up to 40.5 kV and 31.5 kA
  • High operational safety, restrike-free
  • Suitable for all environments
  • SF6 free
Live-Tank 3AF04/3AF05

Tailor-made for traction power substations

The Live-Tank 3AF04 / 3AF05 for AC traction power supplies is especially designed for railway distribution networks and consists of three major parts: the pole assembly, the operating mechanism box, and the supporting steel structure. For easy access, the operating mechanism box is situated inside the supporting steel frame. It features the circuit-breaker operating mechanism including motor, release and auxiliary switches and the control cabinet. The actual switching is carried out by a vacuum interrupter mounted inside the weatherproof pole assembly at electrical potential (live). The two pole assemblies rest on a base frame with a common operating shaft.

The design of our AC traction power supply OVCBs 3AF04 and 3AF05 respectively offers all the advantages of the proven 3-pole live-tank OVCB 3AF01. It comprises a minimum number of moving parts and a simple construction, which guarantee outstanding operational reliability and mechanical endurance. All control elements have been placed in the operating mechanism box, which also contains the fully wired control cabinet for local operation of the circuit-breakers.

  • One- and two-pole designs available
  • Well-established vacuum technology for reliable switching duties
  • Practically maintenance-free up to 10,000 operations
  • Weather-proof, compact design
  • Fulfills IEC 62271-1, IEC 62271-100 as well as EN 50152-1, EN 50163 for railway applications
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