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A20 Bus Insulators and Bus Bar Insulators

Eger supplies the highest-quality porcelain A20 bus insulators. Porcelain A20 bus insulators are used by switchgear, power transformer and bus duct manufacturers where reliability and ‘uptime’ is paramount. Porcelain A20 bus insulators typically have high mechanical stresses placed on them, and our A20 bus insulators meet all industry standards.

A20 porcelain bus insulators are offered for the following voltage classes:

  • 5kv
  • 7.2kv
  • 15kv/95kv BIL
  • 15kv/110kv BIL

Porcelain A20 bus insulators are typically used to support copper bus-bars, and are commonly used in high-voltage switching applications. Eger supplies porcelain A20 bus insulators that have aluminum inserts to for durability and ease of installation.

The design of porcelain A20 bus insulators takes into account both the mechanical and electrical requirements of IEEE, IEC, NEMA and ANSI Standards. Our A20 porcelain bus insulators are cantilever tested and additional testing is performed to ensure our products perform in accordance with the applicable industry standards.

Maintenance of porcelain A20 bus insulators is not required. The glaze coating on the exterior of the insulator keeps dirt and pollutants from adhering. The aluminum inserts are ideal for supporting copper bus-bars without corrosion.

Eger helps customers avoid long leadtimes by stocking industry standard A20 porcelain bus insulators. Stocking agreements are offered so that your production process can run without interruption. Eger’s porcelain A20 bus insulators can usually be shipped within 24 hours from receipt of order.

To find out more and request a quote:
Call Josh Link 513-947-2537 or
Call Shawn Hall 513-947-2538 or
Call Brian Reed II 513-947-2538 or

Indoor Bus Insulators
A20 Drawings