Photos of Main Insulator Products for Drop‑out Fuse Cutouts

At present, insulators supporting drop‑out fuse cutouts are mainly divided into two categories: porcelain type and composite (silicone rubber) type.

Porcelain Insulators

This type of insulator has an operating history of more than one hundred years, which fully proves the reliability and safety of porcelain insulators in high‑voltage power grids.

We adopt special cement and dedicated tooling for porcelain insulator cementing to meet requirements of mechanical strength and installation accuracy.

Composite Insulators

Although composite insulators do not have a century‑long application history, they have been operated in high‑voltage power grids for more than 50 years. The required service life for transmission and distribution lines is generally within 30 years. This sufficiently demonstrates that composite insulators can fully guarantee power grid safety and reliability. Meanwhile, composite insulators feature ultra‑light weight and maintenance‑free performance;

Studies show that during manufacturing, taking 110 kV suspension insulator as an example:

A composite insulator consumes approximately 120‑160 kWh, while a porcelain insulator consumes 1820‑2240 kWh, representing an 11‑ to 18‑fold difference.

Composite insulators produce around 70‑85 kg CO₂e carbon emissions, compared with 385‑455 kg CO₂e for porcelain insulators, a 5‑ to 6.5‑fold gap.

Over the past decade, with globalization and growing environmental awareness worldwide, as well as strict carbon emission regulations, composite insulators show a strong trend of comprehensively replacing porcelain insulators.

As a globally leading supplier of composite insulators, we realize full‑industrial‑chain production and quality control. Our composite insulators fully comply with mainstream standards including GB/T, IEC and ANSI.

What Is Composite Insulator

Composite insulator, also known as polymer insulator, rod insulator or silicone rubber insulator, is a critical component in transmission‑distribution systems to support conductors and provide insulation between conductors and towers. Different from traditional porcelain or glass insulators, it adopts polymer material technology and has outstanding advantages such as light weight, high mechanical strength and excellent pollution resistance. It is widely applied in high‑voltage and extra‑high‑voltage transmission lines.

Compared with conventional porcelain or glass insulators, composite insulators deliver remarkable advantages:

• Maintenance‑free against pollution (anti‑pollution flashover): Thanks to the migration property of silicone rubber, dust accumulated on sheds will hardly impair hydrophobicity, greatly cutting maintenance costs;

• Light weight: Weight is only 1/7‑1/10 of porcelain insulators. It lowers requirements for field operators and construction equipment and reduces tower load;

• High fracture resistance: Good toughness prevents damage during transportation and installation.

A composite insulator consists of three major parts:

Core Competitiveness

Why we can be a world‑class composite insulator supplier: we not only produce finished composite insulators, but also self‑manufacture end fittings, core rods and silicone rubber compound.

Click links below to visit our digital 360° panoramic workshop and experience our manufacturing capability.

Core Business: Manufacturing, sales and service of finished and semi‑finished composite insulators; we also provide turn‑key EPC projects for composite insulator production lines.

Global Footprint: We have successfully built 7 insulator factories in the following countries:

• South America: Argentina

• Asia: Thailand, Türkiye

• Africa: Ethiopia, Morocco, Tanzania

• Europe: Bulgaria

Main Application Fields

I. Primary Application Scenarios

1. Outdoor substations and open‑air switchyards: 10kV‑220kV. Supporting GW4, GW5, GW22 outdoor disconnectors, supporting switch conductive arms, providing insulation for live high‑voltage parts against ground and offering visible isolation points for maintenance. Including suburban, county‑level and mountainous substations.

2. Overhead distribution networks and pole‑mounted disconnectors: 10‑35kV. Insulators for pole‑mounted outdoor disconnectors, pole‑mounted section switches and drop‑out fuse cutouts. Widely used in urban‑rural distribution network upgrading and rural power grid renovation projects.

3. Power grids in heavy‑pollution zones: coastal salt‑fog areas, surrounding chemical plants, cement plants, mines and dusty regions. Composite insulators with large creepage distance replace traditional porcelain insulators to reduce pollution‑caused tripping and eliminate cleaning maintenance.

II. New Energy Industry (Fastest‑growing Market)

1. PV power station step‑up substations for centralized solar plants: essential accessories for 40.5 kV disconnectors. Silicone rubber insulators for disconnectors are preferred for gobi‑desert sites with large day‑night temperature difference and heavy sand‑dust. Mass procurement of GW5‑40.5 kV insulators for mountain PV, fishery‑solar complementary and tidal‑flat solar projects.

2. On‑shore & offshore wind farm step‑up substations: 35kV‑110 kV high‑voltage disconnectors. Offshore wind power sets strict requirements for salt‑fog resistance and anti‑corrosion performance; composite insulators serve as the preferred solution.

3. Energy‑storage power stations: insulating supporting components for disconnectors outside high‑voltage energy‑storage containers.

III. Rail Transit Industry

1. High‑speed & conventional‑rail traction substations: 35 kV and 110 kV outdoor disconnectors for railway traction stations, suitable for harmonic environment with excellent seismic resistance. GW4‑40.5 kV high‑voltage disconnectors for metro switching stations, widely adopted in urban metro and intercity railway projects.

2. Switchgear equipment for urban light‑rail power supply systems.

IV. Self‑owned Power Stations & Auxiliary Power Systems for Industrial Plants

1. Large industrial and mining enterprises: self‑owned substations of steel mills, chemical plants, refineries, mines, cement plants and paper mills; outdoor disconnectors in plant high‑voltage distribution rooms. Composite insulators outperform porcelain insulators for sites with heavy dust and corrosive gas.

2. Disconnectors for 10‑110 kV main step‑down substations in metallurgical, non‑ferrous metal smelting and large manufacturing plants.

3. Pumped‑storage and hydropower stations: insulators for GW4/GW5 disconnectors in outdoor high‑voltage switchyards of hydropower plants, adapted to humid rainy conditions.

V. Other Niche Application Fields

1. Oil & gas industry: substations for oil‑gas fields and long‑distance pipelines, high‑voltage disconnectors for remote field sites.

2. Airports, ports and large data centers: high‑voltage switchgears for airport switching stations, port distribution systems and external power supply of big‑data centers.

VI. Applicable Voltage Levels

Disconnector insulators for 10kV, 35kV (40.5kV), 66kV, 110kV, 220kV.