Porcelain and Glass Insulators for Overhead Lines and Substations
Suspension discs, long-rods, line posts, pin type, strain and spool units built to GB, ANSI, BS, DIN, AS and IEC designations, for systems up to 500 kV AC and 400 kV DC.
Station Posts and Line Posts Sized to Your Short Circuit Loads
Cantilever strength to 46 kN and torsion to 1500 N-m, with creepage figures published per type so the busbar and disconnector calculation can be finished before you order.
Toughened Glass Discs That Show a Failed Unit From the Ground
Fog, standard, aerodynamic and double umbrella profiles from 40 kN to 210 kN, with creepage from 190 mm to 550 mm per unit for polluted and coastal routes.
Insulators for the Lines and Substations You Are Building
Porcelain and toughened glass insulators for overhead lines and substations: suspension discs, long-rods, pin type, line post, station post, strain and spool units, made in Shangbu, Pingxiang, where electric porcelain has been produced for generations.
Eight Insulator Families From One Factory
Every type below carries its published creepage, coupling, mechanical and withstand figures, so the selection can be closed before an enquiry is sent.
Glass Insulators
Toughened glass suspension discs from 40 kN to 210 kN in standard, fog, aerodynamic and double umbrella profiles.
11 products in this category
Disc Type Suspension Insulators
ANSI cap and pin porcelain discs in ball and socket and clevis couplings, from 44 kN to 67 kN combined M&E strength.
3 products in this category
Long-Rod Type Suspension Insulators
Solid-core porcelain long-rods at 40 kN and 70 kN tensile strength, with 450 mm and 530 mm creepage in a single unit.
2 products in this category
Station Post Insulators
Solid-core porcelain posts for substation busbars and switch bases, with cantilever strength to 46 kN and torsion to 1500 N-m.
2 products in this category
Line Post Insulators
Porcelain line posts for 35 kV and 45 kV class construction, with 12.5 kN cantilever strength and leakage distances of 559 mm and 737 mm.
2 products in this category
Pin Type Insulators
Porcelain pin type insulators for 15 kV and 34.5 kV distribution, with 13.6 kN cantilever strength and leakage distances of 305 mm and 533 mm.
2 products in this category
Strain and Guy Insulators
Porcelain strain insulators at 53 kN and 91 kN tensile strength, fitted into guy wires to keep the anchor at earth potential.
2 products in this category
Spool Insulators
Porcelain spool insulators at 13.6 kN and 18.2 kN transverse strength for secondary racks and service drops.
2 products in this categoryTwelve of the Twenty Six Catalogued Designs
Suspension discs, long-rods, posts, pin type, strain and spool units in porcelain and toughened glass.
Double umbrella disk Suspension Insulators UG120B146/450D 16R
120 kN Double Umbrella Disc for Heavy Contamination
View specifications
Double umbrella disk Suspension Insulators UG70B146/450D 16R
70 kN Double Umbrella Disc for Dust and Dew Conditions
View specifications
Glass Aerodynamic Profile Suspension Insulators LXAP-160 / U160A
160 kN Aerodynamic Glass Disc With a Self-Cleaning Shed
View specifications
Glass Fog Profile Suspension Insulators LXHP-210 / U210BP
210 kN Fog Profile Glass Disc for Long Tension Strings
View specifications
Glass Fog Profile Suspension Insulators U160BP / 155
160 kN Fog Disc With 550 mm Creepage on a 155 mm Spacing
View specifications
Glass Fog Profile Suspension Insulators U160BP/170
160 kN Fog Disc on a 280 mm Shed With 20 mm Coupling
View specifications
Glass Fog Profile Suspension Insulators LXHP-120 / U120BP
120 kN Fog Profile Glass Disc With 450 mm Creepage
View specifications
Glass Fog Profile Suspension Insulators LXHP-70 / U70BP/ U70BLP
70 kN Fog Disc Available in 255 mm and 280 mm Sheds
View specifications
Glass Standard Profile Suspension Insulators LXP-40 / U40B
40 kN Standard Profile Glass Disc for Light Distribution Strings
View specifications
Glass Standard Profile Suspension Insulators LXP-120/ U120BL
120 kN Standard Profile Glass Disc for Clean Environment Lines
View specifications
Glass Standard Profile Suspension Insulators LXP-70 / U70BL
70 kN Standard Profile Glass Disc LXP-70 / U70BL
View specificationsLong-Rod Type Suspension Insulators SL-33/40
40 kN Long-Rod Porcelain Insulator With 530 mm Creepage
View specificationsMost Insulator Failures Start as Selection Failures
Most insulator failures are selection failures: creepage specified for a cleaner site than the line actually crosses, a coupling that does not match the string already on the tower, or a punctured porcelain unit nobody can see from the ground. We publish the full mechanical and electrical figures for every type so those decisions can be made before the order, not after the outage.
Pollution Flashover on an Existing Line
A line built with standard-profile discs starts flashing over once a cement works, a mine road or a coastline changes the deposit on the sheds. The published creepage per unit, from 190 mm to 850 mm depending on type, is what lets you recalculate the string before specifying a replacement.
Punctured Units Nobody Can See
A punctured porcelain cap and pin disc stays in the string and looks normal from the ground. Toughened glass shatters when it punctures and long-rods have no cement joint in the dielectric path, so both remove that inspection problem in different ways.
Couplings That Do Not Match the Tower
Replacement discs arrive with a 20 mm ball when the string uses 16 mm, or a ball and socket when the line is built on clevis hardware. Every type in this catalogue states its coupling, spacing and shed diameter so the match is checked on paper.
Busbar Supports Sized Without the Torsion Check
Station posts are often selected on voltage alone, then fail when a disconnector is operated. Cantilever strength and torsion strength are both published here, 46 kN and 1500 N-m on the C6-170, so the mechanical case can be closed properly.
Utilities Contractors and Distributors
Transmission and distribution utilities, substation and line EPC contractors, switchgear builders and line hardware distributors buying against GB, ANSI, BS, DIN, AS and IEC specifications.
Overhead Transmission Lines
Transmission strings carry the conductor and the line tension while holding off the system voltage in whatever air the route passes through. Zhaotong ...
Read the application notesPower Distribution Networks
Distribution networks buy insulators in volume and fit them fast. What matters is dimensional consistency between batches, the right pin height, and e...
Read the application notes
Substations and Switchyards
In a substation the insulator is a structural component as much as an electrical one. It holds a rigid busbar against short-circuit forces and takes t...
Read the application notesCapacity Standards and Engineering Support
Production capacity of 10,000 tons per year, designs covering system voltages up to 500 kV AC and 400 kV DC, manufacturing certified to ISO 9001:2015, and engineering support for non-standard designs when a catalogue item does not fit the application.
The works are at Xitang, Pingli, Shangbu, Luxi, Pingxiang, Jiangxi, inside the Luxi electroceramics district, with a porcelain insulator capacity of 10,000 tons per year.
- Designs covering system voltages up to 500 kV AC and 400 kV DC
- GB, ANSI, BS, DIN, AS and IEC standard designs supplied against one order
- Manufacturing certified to ISO 9001:2015
- Engineering support for non-standard designs when no catalogue item fits
- Routine test records issued with the shipment and type test reports on request
- Units marked with type designation and production identification for traceability
Where the Catalogue Stops and Engineering Starts
Three routes we work through with buyers when the item number alone does not answer the question.
Non-Standard Insulator Design
Catalogue designs cover the standard cases. When an application falls outside GB, ANSI, BS, DIN, AS or IEC standard designs, our engineers work with you on an insulator for that specific application.
See how it worksPollution Performance Selection
Most insulator problems in service are contamination problems. Choosing a profile is not about buying the longest creepage figure; it is about matching the shed geometry to the deposit the line actually collects.
See how it worksStandards Compliant Sourcing
Buyers rarely have one standard across a whole network. Zhaotong produces to GB, ANSI, BS, DIN, AS and IEC standard designs, so a single order can cover an ANSI distribution network and an IEC transmission line without two supply chains.
See how it worksSelection Quality and Maintenance Guides
Technical notes written from our own production and inspection practice.
What the Black RF Glaze on an Insulator Actually Does
Semiconductor RF glaze standardises the potential gradient across the insulator surface so capacitive arcs do not generate radio frequency noise.
Read the guide
Which Defects Are Acceptable in a Porcelain Insulator
Incoming inspection criteria for glazed and unglazed surfaces, based on the definitions used in international standards such as IEC.
Read the guide
How Insulator Glaze Colour Is Determined
Colour has no effect on electrical or mechanical performance, but ANSI grey is defined to a Munsell notation with stated tolerances.
Read the guideFrequently Asked Questions
What do you manufacture?
Porcelain and toughened glass insulators for overhead lines and substations: suspension discs, long-rods, pin type, line post, station post, strain and guy, and spool insulators, covering 26 catalogued designs.
Which standards do you produce to?
GB, ANSI, BS, DIN, AS and IEC standard designs for building transmission and distribution lines and substations, for system voltages up to 500 kV AC and 400 kV DC.
Can you design an insulator for a non-standard application?
Yes. Our engineers work on insulators for specific non-standard applications where a catalogue design does not fit. Send the system voltage, mechanical loads, pollution class and mounting arrangement to start.
Is the factory certified?
Manufacturing facilities are certified to ISO 9001:2015.
What is your production capacity?
10,000 tons of porcelain insulators per year.
How do we get a quotation?
Email [email protected] with the type designation or the specification, the quantity and the destination port, and we will quote against it. There is no enquiry form to fill in.
Send Us the Specification and We Will Quote Against It
Email the type designation or the specification with your quantity and destination port. No enquiry form, no account to create.