H1: AS 3609 GY-4 Insulator — 222kN Porcelain Stay Insulator for Overhead Lines
The AS 3609 GY-4 Insulator is a high-strength porcelain stay-type insulator specifically designed for stay wire isolation in overhead power distribution networks with voltages greater than 1000V a.c.
Manufactured in strict accordance with AS 3609:2005 Australian Standard, this insulator delivers superior electrical insulation and exceptional mechanical endurance for stay wires supporting poles in overhead lines.
With a mechanical failing load of 222kN, the GY-4 is engineered for the most demanding heavy-duty applications requiring maximum tensile strength. Its robust two-transverse-hole design ensures easy installation with stay wires and stable performance under extreme temperature cycling from -40°C to +105°C.
Whether used in heavy-duty guy wire isolation, pole stays, or high-tension corner applications, the AS 3609 GY-4 Insulator offers a durable and reliable solution for the most demanding distribution infrastructure.
H2: AS 3609 GY-4 Insulator Technical Specifications
The AS 3609 GY-4 Insulator features a mechanical failing load of 222kN, making it ideal for heavy-duty stay wire applications with extreme tensile loads.
Key electrical and dimensional ratings are detailed below:
| S/N | Technical Standard Particulars/Details | Brown (GY-4B) | Gray (GY-4G) |
| 1 | Product Item No./SKU Code | GY-4B | GY-4G |
| 2 | Glaze Color | Brown | Gray |
| 3 | Standard Reference | GY-4 | GY-4 |
| 4 | Figure No. (per AS 3609) | 4.4 | 4.4 |
| 5 | Type | Stay | Stay |
| 6 | Height H/mm (in.) | 280 (11) | 280 (11) |
| 7 | Outer Diameter D/mm (in.) | 115 (4-1/2) | 115 (4-1/2) |
| 8 | Inner Diameter d/mm (in.) | 67 (2-5/8) | 67 (2-5/8) |
| 9 | Transverse Hole Diameter d1/mm (in.) | 38 (1-1/2) | 38 (1-1/2) |
| 10 | Hole Center Spacing B/mm (in.) | 89 (3-1/2) | 89 (3-1/2) |
| 11 | Height to Hole F/mm (in.) | 165 (6-1/2) | 165 (6-1/2) |
| 12 | Mechanical Failing Load /kN | 222 | 222 |
| 13 | Power-frequency Wet Withstand Voltage (kV) | 20 | 20 |
| 14 | Low-frequency Wet Flashover Voltage (kV) | 30 | 30 |
| 15 | Steel Strand for Mechanical Test | 19/2.75 | 19/2.75 |
| 16 | Net Weight (kg) | 5.7 | 5.7 |
| 17 | Applicable Standard | AS 3609:2005 | AS 3609:2005 |
Material: Manufactured from high-grade wet-process porcelain per AS 3609 requirements.
H2: Material & Construction
Every unit of the AS 3609 GY-4 Insulator is made from high-grade wet-process porcelain, fired at high temperature to achieve maximum density and near-zero porosity.
The stay-type design features two transverse holes for the insertion of stay wires, ensuring easy handling and reliable performance under extreme thermal cycling from -40°C to +105°C.
The hard, glossy glaze coating offers good self-cleaning properties, reducing maintenance frequency. All transitions between surfaces are smoothly radiused to provide even bearing for wire rope or strand, in accordance with AS 3609:2005.
For more on porcelain manufacturing standards, visit the International Electrotechnical Commission (IEC).
H2: AS 3609 GY-4 Insulator Applications & Installation
The AS 3609 GY-4 Insulator is widely used in overhead power distribution networks with voltages greater than 1000V a.c., particularly for heavy-duty stay wire isolation. It is ideal for:
- High-tension guy wire isolation on pole stays
- Heavy-duty dead-end and angle pole stays
- Corner pole stay applications with extreme loads
- Stay wire tensioning in high-voltage distribution networks
The stay-type design allows easy mounting by threading steel strand or wire rope through the transverse holes and securing with clamps.
Explore our full range of suspension insulators and transmission hardware for more options.
H2: AS 3609 GY-4 Insulator Quality & Performance Advantages
Compared to polymer alternatives, porcelain offers unmatched resistance to UV radiation, bird pecking, and scratch damage. Its glaze reduces continuous water film formation, significantly raising pollution flashover voltage.
Moreover, the AS 3609 GY-4 Insulator requires minimal routine maintenance and delivers a service life of over 30 years under normal operating conditions. Full testing procedures are detailed in AS 3609:2005, published by Standards Australia.
Every unit undergoes 100% routine electrical and mechanical testing before dispatch, including visual inspection, dimensional checks, and mechanical load tests. Type tests — such as power-frequency wet flashover and mechanical strength — are performed per AS 3609:2005 requirements.
Sample tests including porosity testing (fuchsin dye penetration test) are conducted on random samples from each lot. Full test reports and traceability records are provided for each batch. For installation guidance, refer to our insulator string assembly guide.
Each insulator is individually packed with foam cushioning and secured in sturdy cartons to prevent transit damage. We offer flexible shipping options (FOB, CIF, EXW) with lead times of 15-30 days depending on order quantity.
For detailed datasheets, CAD drawings, or competitive pricing on the AS 3609 GY-4 Insulator, please contact our sales team via the inquiry form below. We also offer OEM services and free technical consultation for distribution line design.
H2: Why Choose Our AS 3609 GY-4 Insulator
When selecting an AS 3609 GY-4 Insulator for your overhead line project, quality and reliability are paramount. Our AS 3609 GY-4 Insulator is subject to strict quality control at every production stage — from raw material inspection to final electrical testing. We understand that distribution line outages are costly, which is why each AS 3609 GY-4 Insulator is designed for long-term durability.
With years of experience in porcelain insulator manufacturing, we provide competitive pricing, fast delivery, and dedicated technical support. Whether you need a small sample batch or a full container order, our AS 3609 GY-4 Insulator is available with short lead times.
Contact us today to learn how the AS 3609 GY-4 Insulator can enhance your distribution grid reliability.
