China ST-20J Pin Insulator Manufacturers, Factory

  • ST-20J pin insulators are primarily used in overhead distribution lines with voltages of 20kV and below.
  • Their core function is to support and secure conductors, isolating the live wires from the grounded pole structure.
  • They are installed vertically by screwing the base onto a metal or wooden "pin-type" base (pin) fixed to a wooden or concrete pole.

ST-20J 23.jpg

Product Description

Dimensional Data
Spacing (S) 185 mm
Max. shed Diameter (D) 175 mm
Creepage distance (C/D) 400 mm
Mechanical Values
Electronical Failing Load 13 kN
Electrical Values
Power-frequency dry withstand voltage 85 kV
Power-frequency wet withstand voltage 65 kV
Power-frequency puncture voltage 180 kV
Rated voltage 20 kV
Lightning impulse withstand voltage 135 kV
Packing Information
Approx. net weight per unit 3.86 kg
Carton Quantity 6
Pallet Quantity 180
Industry Standard(s)
Manufactured according to IEC-60383-1
Frequently Asked Questions
What is the rated voltage of this insulator?
The rated voltage for this specific model is 20 kV.
What is the creepage distance of the product?
The creepage distance is 400 mm, ensuring reliable performance in various environmental conditions.
Which international standards are followed during manufacturing?
The product is strictly manufactured in accordance with the IEC-60383-1 industry standard.
What are the electrical withstand capabilities?
It features a power-frequency dry withstand voltage of 85 kV and a wet withstand voltage of 65 kV.
How is the product packed for shipping?
Items are packed with 6 units per carton, and a full pallet contains 180 units for large-scale logistics.
What is the mechanical strength of this unit?
The electronical failing load for this insulator is rated at 13 kN.

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