Power Line Insulators

ANSI 57-4 C29.6 Electrical Ceramic Line Post Insulator Porcelain 33kv-55kv Insulators

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Product Overview

ANSI 57-3 series hollow core line post porcelain insulator is specially designed for 22kV overhead distribution lines in Middle East, South America and Africa (compatible with 24kV North American grid). Unlike traditional line post insulators with cast iron base, this model features a hollow core with 32mm center through hole for bolt mounting, eliminating the need for a cast iron base.

Quick Specs
Models: ANSI 57-3, ANSI 57-4
Equivalent: PW-22-Y/10kN, PW-22-Y/12.5kN
Voltage: 22kV (24kV grid compatible)
Strength: 10.0-12.5kN
Dry Flashover: 85-90kV
Impulse Withstand: 145kV
Number of Skirts: 5
Height: 218-232mm
Creepage Distance: 520-550mm
Mounting Hole: 32mm Through
Top Groove: 16mm for AWG #4-2/0
Glaze: Dark Brown
Standard: ANSI C29.7

Product Features

Hollow Core Design - Center through hole mounting, no cast iron base needed.
Integrated U-Groove - Top groove for direct conductor fixing, no external clamps.
Brown Anti-Pollution Glaze - High temperature glaze for coastal and industrial areas.
High Creepage Distance - >=520-550mm for Class III heavy pollution resistance.
Lightning Protection - Impulse withstand 145kV for reliable operation.