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Home > Products > Porcelain Insulator > Line Post Insulator > Porcelain Post Insulator 57-4
Porcelain Post Insulator 57-4
  • Porcelain Post Insulator 57-4

Porcelain Post Insulator 57-4

    Payment Type: L/C,T/T
    Incoterm: FOB,CFR,CIF
    Delivery Time: 30 Days

Basic Info

Model No.: 57-4

Application: Insulators, High Voltage

Material: Porcelain

Certification: SGS, ISO9001

Type: Insulator

Color: Brown,Gray

Place Of Origin: Fuzhou,China


Surface: Glazed

Additional Info

Packaging: Carton, Wooden case, Sack

Transportation: Ocean,Land


Product Description

Porcelain Post Insulator 57-4 is a type of steel insulator, post Pin Insulator is used for supporting wires and resisting electric current, which porcelain wire insulators are consisting of one or more insulating members permanently glued to a metal base, sometimes with a cap,and ceramic electrical insulators can be double mounted on a metal base. The head bolt or one or several bolts are steel mounted on the support structure.

ANSI Class 57-4
Dimensions of the pin/mm M20
Creepage Distance/mm 1015
Dry Arcing Distance/mm 368
Cantilever Strength/kn 12.5
Low Frequency Dry Flashover Voltage/kv 150
Low Frequency Wet Flashover Voltage/kv 125
Critical Impulse Flashover Voltage, Pos/kv 255
Critical Impulse Flashover Voltage, Neg/kv 340
Test Voltage to Ground/kv 44
Maximum RIV at 1000KHZ/μv 200
Net Weight/kg 16
57-4line post insulator

57-4 line post insulators

Our Services

1. Small Orders Accepted
2. Fast producing time, Prompt Delivery
3. International Approvals
4. Reply promptly in 24 hours
5. Best Price


1. Q: How about payment terms?
A: 30% TT deposit + 70% TT before shipment,50% TT deposit + 50% LC balance, Flexible payment can be negotiated.
2. Q: Do you have some videos where we can see the line producing?
A: Yes, we can provide some videos for reference.
3. Q: Are you a Manufacture Factory?
A: Yes. We are the direct manufacture factory, and our factory has specialized in Porcelain Insulator,Composite Insulator,Glass Insulator,arrester, Cut Out Fuse and Power Fitting ,etc.

4. Q: How long is producing time ?

A: Normally it will take about 30 days for production.

5. Q: What is the standard of package ?
A: For small capacity, we use carton, but for big capacity, we will use strong wooden case for protection or double inner packs in a master carton.
6. Q: How do you make sure your good quality ?
A: We use the best raw material , and every single product will go through a series of strict test.

porcelain insulator

We warmly welcome friends both domestic and abroad to visit our company, if you have any questions, please contact with us directly.

Looking for ideal Pin Insulator Manufacturer & supplier ? We have a wide selection at great prices to help you get creative. All the Porcelain Wire Insulators are quality guaranteed. We are China Origin Factory of Ceramic Electrical Insulators. If you have any question, please feel free to contact us.

Product Categories : Porcelain Insulator > Line Post Insulator

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