TE ULP/33/740 Pin Type Insulators – 33kV Overhead Power Lines
The TE ULP/33/740 Pin Type Insulators are robust and dependable solution for insulation and conductor support in 33kV overhead transmission and distribution lines.
Manufactured by TE Connectivity and designed to meet the rigorous requirements of BS EN 60383, this insulator ensures seamless integration into power networks requiring high mechanical strength and reliable electrical performance.
The TE ULP/33/740 Pin Type Insulators feature a specialized brown porcelain body with a semiconductor glaze applied to designated surfaces, providing excellent pollution performance and long-term durability in outdoor environments.
With its rugged construction, this insulator offers exceptional mechanical strength (10kN failing load) and a high creepage distance (740mm) for reliable operation under harsh, polluted conditions.
TE ULP/33/740 Pin Type Insulators – Designation Breakdown
The designation ULP/33/740 follows a logical product coding system:
| Code | Meaning |
| ULP | Line Post Insulator series (TE Connectivity product family) |
| 33 | Typical operating voltage (33 kV class) |
| 740 | Nominal minimum creepage distance (740 mm) |
TE ULP/33/740 Pin Type Insulators – Technical Specifications
| Parameter | Value |
| Model | ULP/33/740 |
| Drawing Reference | T1051AX / PI-ULP/33/740-PSB |
| Applicable Standard | BS EN 60383 |
| Nominal Voltage | 33 kV Class |
| Frequency | 50 Hz / 60 Hz (Standard) |
| Height (H) | 245 mm |
| Shed Diameter (D) | 310 mm |
| Mounting Diameter | Ø120 ± 4 mm |
| Thread Diameter | Ø142 mm |
| Nominal Creepage Distance | 740 mm |
| Protected Creepage Distance | 370 mm |
| Lightning Impulse Withstand Voltage | 200 kV |
| Power Frequency Withstand Voltage (Dry) | 145 kV |
| Power Frequency Withstand Voltage (Wet) | 100 kV |
| Power Frequency Puncture Voltage | 210 kV |
| Minimum Mechanical Failing Load | 10 kN |
| Net Weight (Approx.) | 12.7 kg |
| Color | Brown |
| Surface Finish | Glazed (Semiconductor glaze on designated areas) |
| Thread Type | BS 3288 Part 2 |
| Base Fitting | Cemented Zinc Thimble |
| Manufacturer | TE Connectivity |
| Designer | TE Connectivity Energy |
TE ULP/33/740 Pin Type Insulators – Key Features
Superior Electrical Performance – The ULP/33/740 insulator delivers reliable electrical performance for 33kV systems. With an impulse withstand voltage of 200kV, a dry flashover voltage of 145kV, and a wet flashover voltage of 100kV, it effectively ensures safe operation under various environmental conditions. Testing and verification follow BS EN 60383 – Insulators for overhead lines with a nominal voltage above 1 000 V.
High Mechanical Strength – With a minimum mechanical failing load of 10 kN, the insulator reliably withstands conductor tension, wind loads, and ice accretion, ensuring long-term stability in overhead line installations. For installation best practices, refer to our Insulator installation guide for overhead lines.
Anti-Pollution Semiconductor Glaze – The drawing notes specify a “glazed semiconductor glaze” on marked surfaces. This specialized finish is designed to optimize pollution performance, reduce radio interference, and improve flashover voltage under contaminated and wet conditions. Research on semi-conducting glaze insulator performance demonstrates that semi-conductive glazed insulators exhibit higher flashover voltages compared with conventional porcelain insulators.
High Creepage Distance – With a nominal creepage distance of 740mm and a protected creepage distance of 370mm, this insulator is highly suitable for medium to heavy pollution environments, effectively reducing the risk of pollution flashover.
Hot-Dip Galvanised Hardware – All ferrous parts are hot-dip galvanised, providing excellent corrosion resistance and long-term durability 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.
TE ULP/33/740 Pin Type Insulators – Application Scenarios
The ULP/33/740 high-voltage line post insulator is ideal for:
- Insulation and conductor support in 33kV overhead distribution and transmission lines
- Outdoor installations with exposure to all atmospheric factors
- AC overhead power lines with frequencies not exceeding 100 Hz
- Power distribution networks in medium to heavy pollution environments (thanks to the 740mm creepage and semiconductor glaze)
- Installation on wooden, reinforced concrete, and metal poles
- Transmission and distribution networks requiring high mechanical strength (10kN)
- Mounting options – can be used vertically or horizontally
For projects involving different voltage classes or mechanical load requirements, explore our related product ranges such as 1130W/32 11kV Pin-Type Insulator, SLP/11/180 11kV Pin-Type Insulator, TYPE 510 Porcelain Pin Insulator, TYPE 210 Porcelain Shackle Insulator, and TYPE 205 Porcelain Shackle Insulator.
TE ULP/33/740 Pin Type Insulators – Standards Compliance
| Standard | Description |
| BS EN 60383 | Insulators for overhead lines with a nominal voltage above 1 000 V |
| BS 3288 Part 2 | Insulator and conductor fittings for overhead power lines — Thread form |
| FNA TS 43-93 | Reference Standard (Specific technical requirements for this design) |
| AS/NZS 2947.1 | Test methods — Insulator units (Applicable testing methodology) |
For a comprehensive overview of how these standards apply to your specific project, visit our AS/NZS standards compliance overview.
TE ULP/33/740 Pin Type Insulators – Recommended Installation
The ULP/33/740 line post insulator features a cemented zinc thimble base with a thread form conforming to BS 3288 Part 2. It is designed for direct mounting onto cross arms, pole brackets, or building facades using appropriate bolts or pins. The spool design features integral grooves for secure conductor tying, ensuring reliable strain relief in dead-end and angle applications.
Why Choose TE ULP/33/740 Pin Type Insulators for Your Power Grids?
- Full compliance – designed to meet BS EN 60383 standards, ensuring smooth acceptance by grid operators and regulatory bodies.
- Proven reliability – engineered with 10 kN minimum failing load for dependable strain and dead-end applications.
- Pollution-resistant design – 740mm creepage distance and semiconductor glaze ensure reliable operation in medium to heavy pollution environments.
- Weather-resistant – durable brown porcelain body with hot-dip galvanised hardware provides excellent weather resistance and UV protection.
- Cost-effective – high performance at competitive pricing, reducing total project costs.
- Versatile – suitable for 33kV applications and available with custom surface finishes.
About the TE ULP/33/740 Pin Type Insulators Manufacturer
The TE ULP/33/740 Pin Type Insulators is manufactured by TE Connectivity, a global leader in connectivity and sensor solutions with decades of experience in power line products. TE Connectivity 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. View the full TE Energy official product range for related product specifications and technical documentation.
Designer: TE Connectivity Energy
Model: ULP/33/740 | Standard: BS EN 60383 | Rated Voltage: 33 kV | Creepage Distance: 740 mm | Mechanical Failing Load: 10 kN
Related Products & Technical Resources
Related Products
- 1130W/32 11kV Pin-Type Insulator – 250mm creepage, 11kN cantilever, semi-conductive
- SLP/11/180 11kV Pin-Type Insulator – AS 4899 compliant, 180mm creepage, 7kN cantilever
- TYPE 510 Porcelain Pin Insulator – 400-3000V, Cordeau thread, 7kN cantilever
- TYPE 210 Porcelain Shackle Insulator – 650V, 7kN designed loading
- TYPE 205 Porcelain Shackle Insulator – 3300V, 13.5kN designed loading
- 11kV strain insulators for overhead lines – 15kV wet flashover, 71kN mechanical failing load
- 22kV pin type insulators for high voltage – 150kV impulse withstand, 450mm creepage
- 71kN strain insulator for line (AS3609) – Compliant with AS3609
- 222kN strain insulator for line (AS3609) – 20kV wet flashover, 222kN failing load
Technical Resources
- Complete porcelain pin insulator selection guide
- Insulator installation guide for overhead lines
- AS/NZS standards compliance overview
- Pollution level selection guide for insulators
References & Authoritative Resources
- BS EN 60383 – Insulators for overhead lines with a nominal voltage above 1 000 V – BSI Group
- AS/NZS 2947.1 – Test methods for insulator units – Intertek Inform
- For engineers comparing equivalent 33kV line post insulator options, the TE ULP/33/740 datasheet provides a useful benchmark for standard pin and line post configurations.
- Semi-conducting glaze insulator performance study – IEEE Xplore (Relevant for contamination performance insights)
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