H1: ANSI 52-9B Insulator — 44kN Porcelain Suspension Insulator for Overhead Distribution Lines
ANSI 52-9B Insulator is a medium‑sized, high‑creepage suspension insulator designed for distribution‑class overhead lines, particularly in areas with moderate pollution or coastal environments. Manufactured strictly in accordance with ANSI C29.2 standards, this ANSI 52-9B Insulator delivers consistent mechanical endurance and dependable electrical insulation even in challenging outdoor conditions. Its cap‑and‑pin construction ensures stable mechanical performance under extreme temperature cycling from ‑40°C to +105°C. Whether used in industrial zones, rural electrification projects, or urban distribution networks, the ANSI 52‑9B Insulator offers proven reliability and durability. For project engineers seeking a cost‑effective solution with enhanced creepage distance, the ANSI 52‑9B Insulator provides an economical choice for long‑term service.
H2: ANSI 52-9B Insulator Technical Specifications
The ANSI 52‑9B Insulator has a rated combined mechanical and electrical (M&E) failing load of 44kN (10,000 lbf), making it suitable for distribution‑class applications. Its nominal creepage distance is 210mm (8‑1/4 inches), providing superior pollution flashover performance compared to standard distribution insulators, especially in coastal and industrial environments. The dry low‑frequency flashover voltage is 70kV, and the wet flashover voltage is 35kV. The disc diameter is 146mm (5‑3/4 inches), and the unit spacing is 165mm (6‑1/2 inches). The coupling hardware uses the standard clevis type, fully interchangeable per ANSI dimensional requirements, allowing direct replacement of old units without tower modifications.
Standard glaze colors are grey or brown. The porcelain body is manufactured by the wet process, and a zinc collar is optionally available.
Complete Technical Data per ANSI/NEMA C29.2A‑2020 (both glaze colors):
| S/N | Technical Standard Particulars/Details | Brown (Data/Measured Value) | Gray (Data/Measured Value) |
| 1 | Product Item No./SKU Code | 3301B52-9B | 3301G52-9B |
| 2 | Glaze Color | Brown | Gray |
| 3 | ANSI Class | 52-9B | 52-9B |
| 4 | Figure No. | 1 | 1 |
| 5 | Connecting hardware coupling | Clevis | Clevis |
| 6 | Disc diameter D/in.(mm) | 5‑3/4 (146) | 5‑3/4 (146) |
| 7 | Unit Spacing H/in.(mm) | 6‑1/2 (165) | 6‑1/2 (165) |
| 8 | Leakage distance /in.(mm) | 8‑1/4 (210) | 8‑1/4 (210) |
| 9 | M&E strength /lb(kN) | 10000 (44) | 10000 (44) |
| 10 | Tension proof /lb(kN) | 5000 (22) | 5000 (22) |
| 11 | Impact strength /in‑lb(N‑m) | 48 (5.4) | 48 (5.4) |
| 12 | Low‑frequency dry flashover voltage (kV) | 70 | 70 |
| 13 | Low‑frequency wet flashover voltage (kV) | 35 | 35 |
| 14 | Critical impulse flashover voltage, Positive (kV) | 110 | 110 |
| 15 | Critical impulse flashover voltage, Negative (kV) | 105 | 105 |
| 16 | Low‑frequency puncture voltage (kV) | 90 | 90 |
| 17 | Radio‑influence voltage data‑RIV (Test voltage to ground)（kV） | 7.5 | 7.5 |
| 18 | Radio‑influence voltage data‑RIV (Max. RIV at 1000kHz)（μV） | 50 | 50 |
| 19 | Net weight (kg) | 3.2 | 3.2 |
| 20 | Applicated Standard | ANSI C29.2A | ANSI C29.2A |
H2: Material & Construction
Every unit of the ANSI 52‑9B Insulator is made from high‑grade alumina porcelain, fired at over 1,300°C to achieve maximum density and near‑zero porosity. The cap is produced from malleable cast iron, and the pin from hot‑dip galvanized steel — both providing excellent corrosion resistance. The cement bonding between porcelain and metal parts uses high‑quality Portland cement, ensuring stable mechanical performance under extreme thermal cycling from ‑40°C to +105°C. The hard, glossy glaze coating offers good self‑cleaning properties, reducing maintenance frequency. Cotter keys for locking connections are stainless steel for enhanced corrosion protection. For more on porcelain manufacturing standards, visit the International Electrotechnical Commission (IEC).
H2: ANSI 52-9B Insulator Applications & Installation
The ANSI 52‑9B Insulator is widely used on distribution‑class overhead lines, rural electrification networks, and substation entry towers where moderate mechanical strength and enhanced creepage are required. Typical string configurations are:
- 15kV — 2 to 3 discs per string
- 25kV — 3 to 4 discs per string
- 34.5kV — 4 to 5 discs per string
It can be assembled into single, double, or V‑strings to meet various tension and suspension requirements. Whether for urban grid upgrades or rural electrification projects, the ANSI 52‑9B Insulator offers a cost‑effective and durable insulation solution with improved pollution performance. Standard coupling dimensions ensure full compatibility with existing clevis pins, sockets, and yokes. For live‑line maintenance, it allows easy hot‑stick handling, reducing outage time during replacement.
Explore our full range of suspension insulators and transmission hardware for more options.
H2: ANSI 52-9B Insulator Quality & Performance Advantages
Compared to polymer alternatives, porcelain offers unmatched resistance to UV radiation, bird pecking, and scratch damage. Its hydrophobic glaze reduces continuous water film formation, significantly raising pollution flashover voltage. Moreover, the ANSI 52‑9B Insulator requires minimal routine maintenance and delivers a service life of over 50 years under normal operating conditions. Full testing procedures are detailed in ANSI C29.2, published by NEMA. For installation guidance, refer to our insulator string assembly guide.
Every unit undergoes 100% routine electrical and mechanical testing before dispatch, including visual inspection, dimensional checks, mechanical load tests, and high‑voltage withstand tests. Prototype tests — such as temperature cycling, thermal‑mechanical performance, and radio interference voltage (RIV) — are also performed per ANSI C29.2A. Full test reports and traceability records are provided for each batch.
Each insulator is individually packed with foam cushioning and secured in sturdy wooden crates or corrugated 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 ANSI 52‑9B Insulator, please contact our sales team via the inquiry form below. We also offer OEM services and free technical consultation for string assembly design.
H2: Why Choose Our ANSI 52‑9B Insulator
When selecting an ANSI 52‑9B Insulator for your distribution project, quality and reliability are paramount. Our ANSI 52‑9B Insulator is subject to strict quality control at every production stage — from raw material inspection to final electrical testing. We understand that line outages are costly, which is why each ANSI 52‑9B Insulator is designed for long‑term durability. With over a decade 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 ANSI 52‑9B Insulator is available with short lead times. Contact us today to learn how the ANSI 52‑9B Insulator can enhance your distribution grid reliability.
