Life-Tank Outdoor Vacuum Circuit-Breakers 3AF04/3AF05

for Traction Power Substations


Life-Tank Outdoor Vacuum Circuit-Breakers 3AF04/3AF05

Built to meet demanding requirements
The 3AF04/3AF05 OVCBs for AC traction power supplies consist 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.

Life-Tank Outdoor Vacuum Circuit-Breakers 3AF04/3AF05

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 pole assemblies consist of two porcelain insulators that separate the terminal connectors from the steel structure. The upper insulator contains the vacuum interrupter: its upper end is fixed to the upper terminal connector, while its lower end allows free axial movement inside flexible connectors to connect it the lower terminal connector. Underneath the lower insulators covers the switching rod is located, which transmits the switching movement from the operating mechanism box to the vacuum interrupter.

Proven live-tank design

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.

Technical Data

Rated operating current

2,000 A

Rated voltage

27.5 kV

Short-circuit breaking current

31.5 kA

Lightning impulse withstand voltage

200 kV

Operating sequence



Opening time

< 75 ms

Closing time

< 50 ms * 1

Number of operating cycles

10,000 * 2

Number of short circuit operations

up to 100


IEC 62271-100, IEC 62271-1;
EN 50152-1; EN 50163

*1 with second shunt release
*2 higher switching cycle rates on request

Rated voltage

current (kA)

voltage (kV)

Operational current

2,000 A

27.5 kV

31.5 kA

200 kV


  • One- and two-pole designs available

  • Well-established vacuum technology for reliable switching duties

  • Practically maintenance-free up to 10,000 make/break operations

  • Weather-proof, compact design

  • Fulfills IEC 62271-1, IEC 62271-100 as well as EN 50152-1, EN 50163 for railway applications