ST-20J Pin-Type Porcelain Insulator — high-voltage 20kV Overhead Line Insulation Solution for Russian & CIS Markets
The ST-20J pin-type porcelain insulator is a robust and dependable solution for insulation and conductor support in 20kV overhead transmission and distribution lines. Manufactured by Bonle (Fujian) Insulator Co., Ltd. , the ST-20J insulator is designed to meet IEC 60168 Tests on Indoor and Outdoor Post Insulators of Ceramic Material or Glass, IEC 60815 Selection and Dimensioning of High-Voltage Insulators Intended for Use in Polluted Conditions, and IEC 60273 Characteristics of Indoor and Outdoor Post Insulators for Systems with Nominal Voltages Greater than 1000 V, and fully complies with the interstate standard GOST 1232-2017 Porcelain and Glass Pin-Type Insulators for Voltage from 1 to 35 kV. General Specifications. This ensures seamless integration into power networks requiring 20kV insulation solutions.
ST-20J Pin-Type Porcelain Insulator Technical Specifications
| Parameter | Value |
| Rated System Voltage | 20 kV |
| Creepage Distance | 400mm ± 11 |
| Power Frequency Withstand Voltage (Wet) | 65 kV |
| Power Frequency Withstand Voltage (Dry) | 85 kV |
| Lightning Impulse Withstand Voltage | 125 kV |
| Breakdown Voltage | 180 kV |
| Mechanical Bending Failure Load | ≥13 kN |
| Weight | Approx. 3.5 kg |
ST-20J Pin-Type Porcelain Insulator Key Features
Superior Electrical Performance — The ST-20J insulator delivers a dry power frequency withstand voltage of 85kV， wet power frequency withstand voltage of 65kV， lightning impulse withstand voltage of 125kV， and breakdown voltage of 180kV， guaranteeing safe and reliable operation of 20kV lines even under rain, fog, and lightning conditions.
High Mechanical Strength — With a minimum bending failure load of 13kN， the insulator reliably withstands conductor tension, wind loads, and ice accretion, ensuring long‑term stability in overhead line installations.
Excellent Anti‑Pollution Flashover Performance — The creepage distance of 400mm ± 11 effectively increases leakage distance, reduces the risk of pollution flashover, and is particularly suitable for industrial, desert, and coastal areas with high contamination levels.
Simple Structure, Easy Installation — The pin‑type insulator features a porcelain body and a steel pin (or threaded insert) cemented with high‑strength Portland cement. The top groove design facilitates convenient conductor placement and binding, reducing pole height and installation time.
Unglazed Surface with Marking — The insulator features an unglazed surface with clear marking for easy identification and quality traceability, as specified in the technical requirements.
ST-20J Pin-Type Porcelain Insulator Application Scenarios
The ST-20J high‑voltage pin‑type insulator is ideal for:
- Insulation and conductor support in 20kV overhead distribution lines
- Outdoor installations with ambient temperatures ranging from ‑40°C to +40°C
- AC overhead power lines with frequencies not exceeding 100 Hz
- Power transmission and distribution networks in normal, polluted, and high‑altitude areas
ST-20J Pin-Type Porcelain Insulator Standards Compliance
| Standard | Description |
| IEC 60168 | Tests on indoor and outdoor post insulators of ceramic material or glass for systems with nominal voltages greater than 1000 V |
| IEC 60815 | Selection and dimensioning of high-voltage insulators intended for use in polluted conditions — Ceramic and glass insulators for AC systems |
| IEC 60273 | Characteristics of indoor and outdoor post insulators for systems with nominal voltages greater than 1000 V |
| GOST 1232‑2017 | Porcelain and glass pin‑type insulators for voltage from 1 to 35 kV. General specifications |
Why Choose ST-20J Pin-Type Porcelain Insulator for Your Power Grid?
- Full IEC and GOST compliance — ensures smooth acceptance by grid operators and regulatory bodies worldwide
- Proven reliability — with an average annual failure rate of just 0.0005 relative units per year
- Cost‑effective — high performance at competitive pricing, reducing total project costs
- Robust design — engineered to withstand harsh climatic conditions, from extreme cold to high humidity
About the ST-20J Pin-Type Porcelain Insulator Manufacturer
Bonle (Fujian) Insulator Co., Ltd., established in 2006, is located in Baizhong Industrial Zone, Minqing County, Fujian Province, China. The company specializes in the production of high and low voltage electrical porcelain products, including disc suspension insulators, anti‑pollution disc suspension insulators, pin insulators, post insulators, porcelain cross‑arm insulators, and over a hundred other products across dozens of series. All products undergo rigorous electrical and mechanical testing before shipment, ensuring the highest quality standards.
Model: ST-20J | Standards: IEC 60168, IEC 60815, IEC 60273, GOST 1232‑2017 | Rated Voltage: 20 kV | Manufacturer: Bonle (Fujian) Insulator Co., Ltd.
Useful Links (replace with your actual URLs)
- Product Catalog — browse our full range of insulators
- Technical Datasheet — download detailed specifications and drawings
- Request a Quote — get pricing and availability for your project
- Certifications & Compliance — view our quality and testing certificates
For technical inquiries, bulk orders, or customized solutions, please contact our sales team via the links above.
H2: ST-20J Pin-Type Porcelain Insulator References & Authoritative Resources
For certification, standard compliance, and procurement specifications, refer to:
- International Electrotechnical Commission (IEC) — global standards for electrical insulators and porcelain manufacturing.
👉 IEC Homepage - Full Range of Suspension Insulators — explore our complete product portfolio for transmission and distribution lines.
👉 Suspension Insulators Collection - NEMA Standards — official publications covering ANSI C29.7 and related specifications.
👉 NEMA Store - Insulator String Assembly Guide — installation best practices, string design, and torque specifications.
👉 Assembly Guide
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