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POI20A Series

Standoff Insulator

  • for outdoor service
  • 20A strength class
  • up to 46kV/250kV BIL
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Voltage (kV)
BIL (kV)
Height (Inches)
Outside Diameter
Insert Top
Insert Bottom
Drawing Purchase
100-205-01 5 60 3.50 4.00 A1 A1 Request Quote
100-205-09 5 60 3.50 4.00 A7 A7 Request Quote
100-208-01 8 75 4.50 4.00 A1 A1 Request Quote
100-208-09 8 75 4.50 4.00 A7 A7 Request Quote
100-212-01 12 95 5.10 4.00 A1 A1 Request Quote
100-212-09 12 95 5.10 4.00 A7 A7 Request Quote
100-215-01 15 95 6.00 4.00 A1 A1 Request Quote
100-215-09 15 95 6.00 4.00 A7 A7 Request Quote
100-218-01 18 110 7.50 4.00 A1 A1 Request Quote
100-218-09 18 110 7.50 4.00 A7 A7 Request Quote
100-225-01 25 125 8.75 4.00 A1 A1 Request Quote
100-225-09 25 125 8.75 4.00 A7 A7 Request Quote
100-228-01 28 150 10.50 4.00 A1 A1 Request Quote
100-228-09 28 150 10.50 4.00 A7 A7 Request Quote
100-231-01 31 150 11.00 4.00 A1 A1 Request Quote
100-231-09 31 150 11.00 4.00 A7 A7 Request Quote
100-235-01 35 170 12.75 4.00 A1 A1 Request Quote
100-235-09 35 170 12.75 4.00 A7 A7 Request Quote
100-238-01 38 200 14.50 4.00 A1 A1 Request Quote
100-238-09 38 200 14.50 4.00 A7 A7 Request Quote
100-246-01 46 250 20.25 4.00 A1 A1 Request Quote
100-246-09 46 250 20.25 4.00 A7 A7 Request Quote

General Description
- Voltage ratings from 5kV to 46kV
- Impulse rating up to 250kV BIL
- High strength
- Partial discharge free
- Flammability rating, UL 94 V0
- Various mounting insert configurations available, see options tab for details.
- Manufactured to specific industry standards (ANSI C29.1 and ANSI C29.10)


Applications
The POI20A series insulators are designed for outdoor service for ambient temperatures between
-50°C to +75°C. Applications include:
- supports for switchgear bus
- substation posts
- disconnects
- other special power applications


Construction
- Cast in high dielectric strength cycloaliphatic epoxy for UV exposure
- Zinc plated steel mounting inserts are standard, other materials available upon request.
- Insulators rated 95kV BIL and higher have inserts connected to prevent partial discharge on unused
inserts

Standard Mounting Insert Configurations

Polycast offers several standard mounting configurations. For unique applications, custom configurations are also available.
Voltage Electrical Withstand Dimensions* (in inches) Mechanical** Withstand
  BIL 60Hz Height Creep Cantilever (lb) Torsion (in-lb)
5 60 19 3.50 6.00 1750 5000
8 75 26 4.5 7.5 1500 5000
15 95 36 6.0 10.5 1250 4000
18 110 50 7.5 14.5 1000 4000
25 125 60 8.75 17.0 800 4000
28 150 80 10.5 21.0 650 3000
31 150 80 11.0 21.5 600 3000
35 170 80 12.75 27.0 500 2000
38 200 95 14.5 28.75 Application Dependant  
46 250 105 20.25 30.75 Application Depndant  

* All POI20A insulators are 4.00” in diameter, except for the POI20A38 and POI20A46 series, which have a 4.25” diameter flared base for additional mechanical strength.

** Mechanical withstand values are 80-90% of ultimate values. Working loads up to 50% of published values are considered safe for all insert options, but maximum loading will vary with the application and conditions of use. Cantilever forces were applied 2.50” above the loaded end of the insulator.

Additional Mechanical Withstand Details:

Tension—3,000 lb      Compression—30,000 lb

Electrical withstand values are conservative and are based upon test data. The deep shed design makes these insulators suitable for polluted environments.