China ANSI 55-4 Porcelain Pin Type Insulator Manufacturers, Suppliers

  • ANSI 55-4 pin porcelain insulators are mainly used for medium voltage distribution lines.
  • Ceramic pin insulators are installed on the needle sockets on the cross arms of electric poles.
  • The upper end of the insulator is equipped with a groove, through which the wire passes and is tied to the insulator with a wire of the same material as the wire.
  • Needle insulators are suitable for transmission and distribution lines with voltages up to 33 kV. When the working voltage exceeds 33 kV, the pin type insulators become too bulky and hence uneconomical.
  • Ideal for both urban and rural power distribution networks.

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Product Description

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Dimensional Data

Spacing (S) 4 3/8 inch (111 mm)
Diameter (D) 5 1/2 inch (140 mm)
Leakage distance (C/D) 9 inch (229 mm)
Dry arcing distance 5 inch (127 mm)
Minimum pin height 5 inch (127 mm)
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Mechanical Values

Combined M&E strength 3,000 lb (13.3 kN)

Electrical Values

Low frequency dry flashover voltage 65 kV
Low frequency wet flashover voltage 35 kV
Critical impulse flashover voltage, positive 105 kV
Critical impulse flashover voltage, negative 130 kV
Low frequency puncture voltage 95 kV
Type application voltage 13.2 kV
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Radio-influence Voltage

RIV test voltage rms to ground 10 kV
Maximum RIV at 1000 kHz 50 μV
Corona visual lest P/C 18/22 KV
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Packing Information

Approx. net weight per unit 4.1 lb (1.86 kg)
Pallet Quantity 420 pcs
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Industry Standard(s)

Manufactured according to ANSI C29.5

Frequently Asked Questions

What industry standard does this product comply with?
This product is manufactured in strict accordance with the ANSI C29.5 industry standard, ensuring high reliability and performance for electrical applications.
What are the critical electrical flashover values?
The insulator features a low frequency dry flashover voltage of 65 kV and a wet flashover voltage of 35 kV. The critical impulse flashover is 105 kV (positive) and 130 kV (negative).
What is the mechanical strength of the unit?
The combined mechanical and electrical (M&E) strength is rated at 3,000 lb (13.3 kN), providing robust support for power line installations.
Can you provide the weight and pallet information?
Each unit weighs approximately 4.1 lb (1.86 kg). For bulk shipping, the standard pallet quantity is 420 units.
What is the leakage and arcing distance?
The insulator provides a leakage distance of 9 inches (229 mm) and a dry arcing distance of 5 inches (127 mm).
What are the radio-influence voltage (RIV) specifications?
The maximum RIV at 1000 kHz is 50 μV with a test voltage rms to ground of 10 kV.

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