H1: XMP-70 Suspension Insulator (U70BL) Aerodynamic Type — 70kN, 300mm Creepage, 105kV Lightning Impulse, Brown/Gray Glaze, IEC 60383
The XMP-70 Suspension Insulator (U70BL) Aerodynamic Type is a high-performance cap-and-pin porcelain insulator engineered for medium‑voltage AC overhead transmission and distribution lines. Its distinctive aerodynamic profile reduces wind loading and enhances self‑cleaning properties.
Manufactured in compliance with IEC 60383 international standards, this suspension insulator features a robust porcelain body with a standard cap-and-pin design. The unit is available in either brown (standard) or gray (optional) glaze, both offering identical mechanical and electrical performance.
With a combined mechanical and electrical (M&E) failing load of 70kN and a creepage distance of 300mm, the XMP-70 delivers dependable performance on 33–66 kV lines in standard rural, suburban, and mildly polluted environments.
The aerodynamic design incorporates optimized shed geometry that minimizes wind resistance and promotes rainwater runoff. This reduces maintenance requirements while ensuring stable insulation performance.
Whether you are expanding distribution networks or upgrading existing overhead lines, the XMP-70 suspension insulator offers a durable, cost‑effective choice for your infrastructure, with the flexibility to select your preferred glaze color.
H2: XMP-70 Suspension Insulator — Technical Specifications (Brown & Gray Glaze)
The XMP-70 suspension insulator is rated with a combined mechanical and electrical (M&E) failing load of 70kN, making it suitable for tangent suspension and light‑tension applications on 33–66 kV overhead lines.
Its nominal creepage distance of 300mm provides adequate pollution flashover performance in standard environments. The dry lightning impulse withstand voltage reaches 105kV (positive polarity), and the power frequency wet withstand voltage is 40kV.
The nominal diameter is 350mm, with a spacing (height) of 146mm. The aerodynamic profile reduces wind loading by approximately 15–20% compared to standard disc designs, improving self‑cleaning and reducing tower loads.
The coupling hardware is the standard 16 ball‑and‑socket type, ensuring full interchangeability with existing fittings per IEC dimensional requirements.
The glaze is available in both brown (standard) and gray (optional). All other technical parameters — mechanical, electrical, and dimensional — are identical between the two color options.
Every unit undergoes a routine proof test load of 35kN and an impact strength test of 6Nm to verify mechanical integrity prior to dispatch. Power frequency puncture voltage reaches 120kV, and radio interference voltage (RIV) is exceptionally low at just 50μV at 1000 kHz.
H2: XMP-70 Suspension Insulator — Complete Technical Data (Brown vs. Gray Glaze)
The following table lists all technical parameters for both glaze color options. All values are identical except for the glaze color.
| Parameter | XMP-70 (Brown Glaze) | XMP-70 (Gray Glaze) |
| Glaze Color | Brown | Gray |
| Type Designation | XMP-70 (U70BL) | XMP-70 (U70BL) |
| Figure / Profile | Aerodynamic Type | Aerodynamic Type |
| Diameter D (mm) | 350 | 350 |
| Spacing H (mm) | 146 | 146 |
| Creepage Distance (mm) | 300 | 300 |
| Coupling Size | 16 | 16 |
| Combined M&E Strength (kN) | 70 | 70 |
| Routine Proof Test Load (kN) | 35 | 35 |
| Impact Strength (Nm) | 6 | 6 |
| Power Frequency Dry Withstand Voltage (kV) | 70 | 70 |
| Power Frequency Wet Withstand Voltage (kV) | 40 | 40 |
| Dry Lightning Impulse Withstand Voltage (kV) | 105 | 105 |
| Power Frequency Puncture Voltage (kV) | 120 | 120 |
| Test Voltage RMS to Ground (kV) | 10 | 10 |
| Maximum RIV at 1000 kHz (μV) | 50 | 50 |
| Net Weight, Approximate (kg) | 5.7 | 5.7 |
| Applied Standard | IEC 60383 | IEC 60383 |
Note: The aerodynamic profile of the XMP-70 suspension insulator reduces wind loading by approximately 15–20% compared to standard disc designs, making it ideal for coastal and high-wind areas. Both brown and gray glazes offer the same outstanding performance.
H2: XMP-70 Suspension Insulator — Material and Construction
Each XMP-70 suspension insulator unit is produced from high‑grade porcelain, fired at over 1,300 °C using the wet process, achieving maximum density and near‑zero porosity.
The cap-and-pin design features a porcelain body with a standard metal cap and pin. The metal components are manufactured from malleable cast iron and hot‑dip galvanised steel, providing excellent corrosion resistance in diverse atmospheric conditions.
The cement bonding between the porcelain body and metal parts uses high‑quality Portland cement, guaranteeing mechanical stability across extreme thermal cycling.
The aerodynamic shed profile is carefully engineered to reduce wind resistance and facilitate self‑cleaning through rainwater runoff. The hard, glossy glaze — available in brown or gray — further enhances self‑cleaning and maintains surface integrity over decades of service.
Both glaze colors are applied using the same high‑quality process, ensuring identical durability, hardness, and electrical performance. The choice between brown and gray is purely aesthetic or based on regional preference.
H2: XMP-70 Suspension Insulator — Applications and Installation
The XMP-70 suspension insulator is widely deployed on 33 kV to 66 kV AC overhead transmission and distribution lines, as well as substation entry towers and switching stations.
Its aerodynamic profile makes it particularly advantageous in:
- Coastal regions – Where high winds and salt spray are common; the reduced wind loading minimizes swing and mechanical stress on towers.
- High-wind corridors – Open plains, mountain passes, and offshore-influenced areas where standard discs may experience excessive wind-induced movement.
- Urban and suburban distribution networks – Where space constraints and aesthetic considerations favor compact, clean-profile insulators.
The 70kN mechanical capacity makes it suitable for both suspension and light‑tension applications. The 300mm creepage distance provides reliable performance in standard rural, suburban, and mildly polluted areas.
Typical application scenarios include:
- 33 kV lines – Single suspension strings in distribution networks.
- 66 kV lines – Suspension and light‑tension strings where aerodynamic performance is valued.
- Substation entries – Reliable insulation for strain and dead‑end towers in wind-prone locations.
The standard 16 ball‑and‑socket coupling ensures compatibility with existing clevis pins, yokes, and socket hardware. The compact design facilitates easy hot‑stick handling for live‑line maintenance, minimizing system downtime during replacements.
For higher voltage requirements, multiple units of the XMP-70 suspension insulator can be assembled in strings. Explore our full range of suspension insulators and transmission hardware for more options.
H2: XMP-70 Suspension Insulator — Quality and Performance Advantages
Compared to standard disc‑type suspension insulators, the XMP-70 suspension insulator offers a significant performance advantage through its aerodynamic shed design. This profile reduces wind loading by approximately 15–20%, minimizing insulator swing and reducing mechanical stress on tower structures.
At just 5.7kg, the XMP-70 is significantly lighter than many equivalent 70kN class insulators, reducing tower dead‑load and allowing for more economical tower designs.
The solid porcelain body ensures excellent dielectric strength, with a power frequency puncture voltage of 120kV demonstrating robust insulation integrity. Radio interference voltage (RIV) is exceptionally low at just 50μV at 1000 kHz, ensuring minimal electromagnetic interference with nearby communication systems.
With an expected service life exceeding 50 years under normal operating conditions, the XMP-70 requires minimal routine maintenance. Every unit undergoes 100% routine testing before dispatch, including:
- Visual and dimensional inspections.
- Routine proof test load verification (35 kN).
- Impact strength testing (6 Nm).
- Power‑frequency wet and dry withstand voltage tests.
- Porosity and temperature‑cycle prototype testing per IEC 60383.
Each insulator is individually foam‑cushioned and securely packed in durable wooden crates or corrugated cartons. This prevents damage during transit. We offer flexible shipping arrangements (FOB, CIF, EXW) with lead times of 15–30 days, depending on order quantity.
For detailed product datasheets, CAD drawings, or competitive pricing on the XMP-70 suspension insulator (brown or gray), please contact our sales team via the inquiry form below.
We also provide OEM services and complimentary technical consultation for string assembly design. For installation guidance, refer to our insulator string assembly guide.
H2: XMP-70 Suspension Insulator — Why Choose Our Product?
Selecting the right suspension insulator for your transmission infrastructure is critical to long‑term grid reliability — especially in high-wind or coastal environments. Our XMP-70 suspension insulator is manufactured under stringent quality control protocols at every production stage.
From raw material sourcing (high‑grade porcelain clay) to final high‑voltage electrical testing, every step aligns with IEC 60383. We understand that insulator swing caused by high winds can lead to flashovers, tower damage, and costly outages.
That is why the XMP-70 suspension insulator is specifically engineered with an aerodynamic profile to reduce wind loading and improve self‑cleaning performance. Additionally, we offer both brown and gray glaze options to match regional preferences or project specifications.
With over a decade of experience in porcelain insulator production, we offer competitive factory pricing, prompt delivery, and dedicated after‑sales technical support.
Whether you require a small sample batch for project validation or a full container shipment, the XMP-70 suspension insulator (brown or gray) is available with short lead times. Contact us today to discover how the XMP-70 suspension insulator can strengthen your grid reliability in high-wind and coastal environments.
