SF-20/224 Pin-Type Insulator high-voltage 20kV Overhead Line Insulation Solution for Russian & CIS Markets
The SF-20/224 Pin-Type 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 SF-20/224 insulator is designed to meet IEC 383-1 Specifications for Post Insulators of Ceramic Material or Glass for Indoor and Outdoor Use, 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.
SF-20/224 Pin-Type Insulator Technical Specifications
| Parameter | Value |
| Rated System Voltage | 20 kV |
| Creepage Distance | 400mm |
| Power Frequency Withstand Voltage (Wet) | 65 kV |
| Power Frequency Withstand Voltage (Dry) | 85 kV |
| Lightning Impulse Withstand Voltage | 135 kV |
| Breakdown Voltage | 190 kV |
| Mechanical Bending Failure Load | ≥13 kN |
| Main Dimensions (D × H) | 175mm × 224mm |
| Weight | Approx. 3.5 kg |
SF-20/224 Pin-Type Insulator Key Features
Superior Electrical Performance — The SF-20/224 insulator delivers a dry power frequency withstand voltage of 85 kV， wet power frequency withstand voltage of 65 kV， lightning impulse withstand voltage of 135 kV， and breakdown voltage of 190 kV， 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 13 kN， 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 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.
SF-20/224 Pin-Type Insulator Application Scenarios
The SF-20/224 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
SF-20/224 Pin-Type Insulator Standards Compliance
| Standard | Description |
| IEC 383-1 | Specifications for post insulators of ceramic material or glass for indoor and outdoor use 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 SF-20/224 Pin-Type Insulator for Your Power Grid?
- Full IEC and GOST compliance — ensures smooth acceptance by grid operators and regulatory bodies worldwide
- Enhanced impulse performance — with 135kV lightning impulse withstand voltage, providing superior protection against surge events
- 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 SF-20/224 Pin-Type 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: SF-20/224 | Standards: IEC 383-1, 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: SF-20/224 Pin-Type 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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