Post insulators

Reliable use in plant construction

Our post insulators from the latest high performance ceramics have been in use for many decades in switchgear and capacitor bank platforms. We have experience with the manufacture of post insulators since 1930. Research and further development resulted in the optimization of our post insulators for distribution plants and switchgear systems.

In accordance with the standards IEC, ANSI, CSA and other certifications we manufacture single-component series up to a length of 90 inches and voltage levels up to 1100 kV. Our post insulators are mainly exposed to pressure, bending and torsional forces during operation and have been specifically designed for this purpose. We are also happy to offer our customers a customized full-service solution tailored ideally to their requirements.





  • Voltage level: 1 – 1100 kV
    (>245 kV in multiple component design)
  • Maximum installation length: 90 inches
  • Maximum trunk diameter: 11.33 inches
  • Flexible leakage path up to 2.16 in / kV
  • Conical design
    (preferred for design in accordance with IEC)
  • Cylindrical design
    (preferred for design in accordance with ANSI)







Production method

  • Wet method
  • In accordance with standard C130: high-strength alumina porcelain
  • In accordance with standard C130 HS: extra-high strength
  • Glaze colors: Brown RAL 8017
    and Grey ANSI 70


Manufactured in accordance with the standards

  • IEC 60273
  • IEC 60168
  • IEC 60672
  • ANSI C29


Use in industry-specific solutions

  • Device and plant construction, e.g. switchgear, for busbars
    and disconnect switches
  • Platform support for capacitor banks