ALP/11/275 Pin-Type Insulator Porcelain – AS 4899 Compliant for 11kV Overhead Power Lines
The ALP/11/275 Pin-Type Insulator Porcelain is a robust and dependable solution for insulation and conductor support in 11kV overhead transmission and distribution lines. Manufactured to meet AS 4899‑2007 (Pin insulators — Porcelain and glass for overhead power lines — Voltages greater than 1000 V a.c.) standard requirements, the ALP/11/275 insulator ensures seamless integration into power networks across Australia, New Zealand, and other markets that follow Australian Standards.
The ALP/11/275 features a durable glazed porcelain finish (available in brown or white), providing excellent weather resistance and long-term durability in outdoor environments. With its aerodynamic shed profile design, this insulator offers enhanced self‑cleaning properties, good pollution performance, exceptional mechanical strength, and competitive cost.
ALP/11/275 Pin-Type Insulator Porcelain – AS 4899 Designation Breakdown
The designation ALP/11/275 follows the AS 4899 coding system:
| Code | Meaning |
| A | Aerodynamic shed profile |
| LP | Line Pin |
| 11 | Typical operating voltage (11 kV) |
| 275 | Nominal minimum creepage distance (275 mm) |
ALP/11/275 Pin-Type Insulator Porcelain – AS 4899 Technical Specifications
| Parameter | Value |
| Model | ALP/11/275 |
| Standard | AS 4899‑2007 |
| Figure Number | 2.3 (per AS 4899) |
| Typical Application Voltage | 11 kV |
| Height (H) | 160 mm |
| Diameter (D) | 150 mm |
| Nominal Minimum Creepage Distance | 275 mm |
| Lightning Impulse Withstand Voltage | 105 kV |
| Wet Power Frequency Withstand Voltage | 30 kV |
| Minimum Bending Failing Load | 7 kN |
| Thread Pattern | C (round‑thread form) |
| Recommended Pin Type | C/150/7 |
| Head Type | Type 1 (per Figure 2.12 of AS 4899) |
| Designation / Identification | 275A7 |
| Approximate Net Weight | 2.0 kg (typical) |
Note: The values for lightning impulse withstand voltage (105 kV) and wet power frequency withstand voltage (30 kV) are specified in Table 2.1 of AS 4899‑2007. The height (160 mm) and diameter (150 mm) are sourced from product catalogues compliant with this standard.
ALP/11/275 Pin-Type Insulator Porcelain – AS 4899 Key Features
Superior Electrical Performance – The ALP/11/275 insulator delivers reliable electrical performance for 11kV systems, with a nominal minimum creepage distance of 275 mm that effectively increases leakage distance and reduces the risk of pollution flashover, guaranteeing safe operation of 11kV lines even under rain, fog, and contaminated conditions.
High Mechanical Strength – With a minimum bending failing load of 7 kN, the insulator reliably withstands conductor tension, wind loads, and ice accretion, ensuring long‑term stability in overhead line installations.
Aerodynamic Shed Profile – The “A” (aerodynamic) profile provides enhanced self‑cleaning properties, making it particularly suitable for outdoor applications in areas with moderate to heavy pollution where superior contamination performance is required.
Simple Structure, Easy Installation – The pin‑type insulator features a one‑piece porcelain body designed for convenient mounting on standard pins (recommended type C/150/7). The conductor is secured in the side groove or on the neck of the insulator using standard binding methods.
Glazed Porcelain Finish – The insulator features a durable glaze coating (available in brown or white) that provides excellent weather resistance, UV protection, and self‑cleaning properties, ensuring long‑term performance in harsh outdoor environments.
Reliable Design – Engineered for long‑term reliable operation with minimal maintenance requirements – regular visual inspections and cleaning are typically sufficient to ensure continued performance.
ALP/11/275 Pin-Type Insulator Porcelain – AS 4899 Application Scenarios
The ALP/11/275 high‑voltage pin‑type insulator is ideal for:
- Insulation and conductor support in 11kV overhead distribution and transmission lines
- Outdoor installations with exposure to all atmospheric factors, particularly in areas with moderate pollution
- AC overhead power lines with frequencies not exceeding 100 Hz
- Power distribution networks in normal and moderately polluted environmental conditions
- Installation on wooden, reinforced concrete, and metal poles
- Medium voltage distribution networks in Australia, New Zealand, and other AS‑standard markets
- Mounting options – can be used vertically or horizontally
ALP/11/275 Pin-Type Insulator Porcelain – AS 4899 Standards Compliance
| Standard | Description |
| AS 4899‑2007 | Pin insulators — Porcelain and glass for overhead power lines — Voltages greater than 1000 V a.c. |
| AS/NZS 2947.1 | Test methods — Insulator units |
| AS 1824.1 | Insulation co‑ordination — Definitions, principles and rules |
| AS 4436 | Guide for the selection of insulators in respect of polluted conditions |
| AS 1154.1 | Insulator and conductor fittings for overhead power lines – Performance, material, general requirements and dimensions |
ALP/11/275 Pin-Type Insulator Porcelain – AS 4899 Recommended Pin Type – C/150/7
The ALP/11/275 insulator is designed to be used with pin type C/150/7 per AS 4899. Pin specifications are as follows:
| Parameter | Value |
| Pin Type Reference | C/150/7 |
| Head Pattern | C |
| Cantilever Minimum Failing Load | 7 kN |
| Shank Diameter | 20 mm |
| Shank Length | 165 mm |
| Thread Length (minimum) | 80 mm |
| Minimum Collar Diameter | 60 mm |
| Stem Length | 150 mm |
The pin is supplied complete with one galvanized nut and one galvanized washer, and is forged from steel with a minimum tensile strength of 470 MPa. The head thread conforms to the basic round‑thread form (Pattern C) per Appendix B of AS 4899.
Why Choose ALP/11/275 Pin-Type Insulator Porcelain – AS 4899 for Your Power Grid?
- Full AS compliance – meets AS 4899‑2007 standard, ensuring smooth acceptance by grid operators and regulatory bodies in Australia and New Zealand
- Aerodynamic profile design – enhanced self‑cleaning properties for improved performance in polluted environments
- Proven reliability – engineered with high mechanical strength (7 kN bending failing load) and robust electrical performance
- Pollution‑resistant design – 275 mm creepage distance ensures reliable operation in moderately contaminated environments
- Weather‑resistant – glazed porcelain finish provides excellent weather resistance and UV protection
- Cost‑effective – high performance at competitive pricing, reducing total project costs
- Versatile – suitable for 11kV applications and available in brown or white
About the ALP/11/275 Pin-Type Insulator Porcelain – AS 4899 Manufacturer
The ALP/11/275 Pin-Type Insulator Porcelain is manufactured by one leading Chinese insulator manufacturer Bonle (Fujian) Insulator Co., Ltd. with decades of experience in power line products. This manufacturer holds ISO 9001 certification and produces insulators in accordance with IEC, ANSI, ASTM, AS, BS, DIN, and ISO standards. All products undergo rigorous electrical and mechanical testing before shipment, ensuring the highest quality standards.
Model: ALP/11/275 | Standard: AS 4899‑2007 | Rated Voltage: 11 kV | Creepage Distance: 275 mm
ALP/11/275 Pin-Type Insulator Porcelain – AS 4899 References & Authoritative Resources
For certification, standard compliance, and procurement specifications, refer to:
- AS 4899‑2007 – Pin insulators — Porcelain and glass for overhead power lines — Voltages greater than 1000 V a.c.
- AS/NZS 2947.1 – Test methods — Insulator units
- AS 4436 – Guide for the selection of insulators in respect of polluted conditions
- Full Range of Pin Insulators – explore our complete product portfolio for transmission and distribution lines
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