H1: XWP3-70 Anti-Pollution Insulator (U70BLP) Suspension — 70kN, 450mm Creepage, 120kV Lightning Impulse, Brown/Gray Glaze, IEC 60383
The XWP3-70 Anti-Pollution Insulator (U70BLP) Suspension is a premium high-performance cap-and-pin disc insulator engineered for medium‑voltage AC overhead transmission and distribution lines operating in severely polluted environments.
Its ultra-long creepage distance of 450mm provides superior pollution flashover performance in the most challenging industrial, coastal, desert, and heavy-contamination areas.
Manufactured in compliance with IEC 60383 international standards, this anti-pollution insulator features a robust porcelain disc 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 an ultra-long creepage distance of 450mm, the XWP3-70 delivers dependable performance on 33–66 kV lines in the most severe contamination zones — where even standard 300mm and 400mm creepage insulators may be insufficient.
The advanced anti-pollution shed design incorporates an optimised multi-rib profile that maximises creepage length while maintaining superior self‑cleaning properties.
This ensures reliable insulation performance even under extreme pollution conditions, with significantly reduced maintenance requirements.
Whether you are upgrading existing lines in severely contaminated areas or planning new transmission projects in the harshest environments.
The XWP3-70 anti-pollution insulator suspension offers a durable, ultra‑high‑performance choice for your infrastructure, with the flexibility to select your preferred glaze color.
H2: XWP3-70 anti-pollution insulator suspension — Technical Specifications (Brown & Gray Glaze)
The XWP3-70 anti-pollution insulator suspension 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 in severely contaminated areas.
Its ultra-long creepage distance of 450mm — significantly longer than standard 300mm and extended 400mm designs — provides superior pollution flashover performance in the most severe industrial, coastal, desert, and heavy-contamination environments.
The dry lightning impulse withstand voltage reaches 120kV (positive polarity), and the power frequency wet withstand voltage is 42kV.
The nominal diameter is 280mm — larger than the XWP2-70’s 255mm — with a spacing (height) of 160mm — also taller than the XWP2-70’s 146mm. This increased size accommodates the ultra-long 450mm creepage distance while maintaining mechanical stability and self‑cleaning performance.
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: XWP3-70 anti-pollution insulator suspension — 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 | XWP3-70 (Brown Glaze) | XWP3-70 (Gray Glaze) |
| Glaze Color | Brown | Gray |
| Type Designation | XWP3-70 (U70BLP) | XWP3-70 (U70BLP) |
| Figure / Profile | Anti-Pollution Type | Anti-Pollution Type |
| Diameter D (mm) | 280 | 280 |
| Spacing H (mm) | 160 | 160 |
| Creepage Distance (mm) | 450 | 450 |
| 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) | 80 | 80 |
| Power Frequency Wet Withstand Voltage (kV) | 42 | 42 |
| Dry Lightning Impulse Withstand Voltage (kV) | 120 | 120 |
| 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) | 6.7 | 6.7 |
| Applied Standard | IEC 60383 | IEC 60383 |
Note: The advanced anti-pollution design of the XWP3-70 suspension insulator provides an ultra-long 450mm creepage distance — 150mm longer than standard 300mm designs and 50mm longer than XWP2-70 — delivering superior flashover performance in the most severe contamination environments.
The larger 280mm diameter and 160mm spacing accommodate the extended creepage while maintaining mechanical stability. Both brown and gray glazes offer the same outstanding performance.
H2: XWP3-70 anti-pollution insulator suspension — Material and Construction
Each XWP3-70 anti-pollution insulator suspension 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 disc 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 advanced anti-pollution shed profile is carefully engineered to maximise creepage distance (450mm) while maintaining superior self‑cleaning properties.
The ultra-long creepage is achieved through an optimised multi-rib and under‑rib geometry that significantly increases the surface leakage path.
The larger 280mm diameter and 160mm spacing provide additional surface area for improved pollution performance.
The cement bonding between the porcelain body and metal parts uses high‑quality Portland cement, guaranteeing mechanical stability across extreme thermal cycling.
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.
H2: XWP3-70 anti-pollution insulator suspension — Applications and Installation
The XWP3-70 anti-pollution insulator suspension is widely deployed on 33 kV to 66 kV AC overhead transmission and distribution lines, as well as substation entry towers, in areas where airborne contamination is at its most severe.
The ultra-long 450mm creepage distance makes it the ideal choice for:
- Heavy industrial zones – Where airborne contaminants from factories, power plants, chemical facilities, cement works, and mining operations create extreme pollution conditions that exceed the capabilities of standard and even 400mm creepage insulators.
- Coastal and marine environments – Where heavy salt spray and marine aerosols create highly conductive deposits on insulator surfaces, increasing leakage current and flashover risk.
- Desert and arid regions – Where wind‑borne sand, dust, and combined industrial activities create challenging contamination conditions.
- Urban and suburban corridors with heavy traffic – Where concentrated traffic emissions and combined industrial pollution create severe contamination challenges.
- Areas with frequent fog, drizzle, or high humidity – Where moisture combines with deposited contaminants to create conductive film on insulator surfaces.
- Heavy pollution “hot spots” – Where local conditions create pollution levels exceeding standard design parameters.
Its 70kN mechanical capacity makes it suitable for both suspension and light‑tension applications. The ultra-long 450mm creepage provides reliable performance even under the most severe pollution conditions.
Typical application scenarios include:
- 33 kV lines – Single suspension strings in severely polluted industrial and coastal areas where standard insulators are inadequate.
- 66 kV lines – Suspension and light‑tension strings where maximum pollution performance is the primary concern.
- Substation entries – Reliable insulation for strain and dead‑end towers in the most contaminated environments.
- Pollution “hot spots” – Replacement of failed or underperforming standard insulators in areas with historically high flashover rates.
The standard 16 ball‑and‑socket coupling ensures compatibility with existing clevis pins, yokes, and socket hardware.
The anti-pollution disc design facilitates easy hot‑stick handling for live‑line maintenance, minimizing system downtime during replacements.
For higher voltage requirements, multiple units of the XWP3-70 anti-pollution insulator suspension can be assembled in strings.
Explore our full range of suspension insulators and transmission hardware for more options.
H2: XWP3-70 anti-pollution insulator suspension — Quality and Performance Advantages
The XWP3-70 anti-pollution insulator suspension represents the pinnacle of pollution performance in the 70kN class. Its ultra-long 450mm creepage distance delivers:
- 150mm (+50%) advantage over standard 300mm creepage designs
- 50mm (+12.5%) advantage over XWP2-70’s 400mm creepage design
This extended creepage is complemented by larger physical dimensions — 280mm diameter and 160mm spacing — that provide additional surface area for improved pollution performance, enhanced self‑cleaning, and greater mechanical stability.
Beyond its exceptional creepage distance, the XWP3-70 offers superior electrical ratings:
- Power frequency dry withstand voltage: 80kV (vs. 70kV on standard models)
- Power frequency wet withstand voltage: 42kV (vs. 40kV on standard models)
- Dry lightning impulse withstand voltage: 120kV (vs. 105kV on standard models)
At just 6.7kg, the XWP3-70 offers excellent performance for its creepage class — only 0.8kg heavier than the XWP2-70 while delivering a 50mm increase in creepage distance.
The solid porcelain body ensures excellent dielectric strength, with a power frequency puncture voltage of 120kV.
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 XWP3-70 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 XWP3-70 anti-pollution insulator suspension (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: XWP3-70 anti-pollution insulator suspension — Why Choose Our Product?
Selecting the right suspension insulator for your transmission infrastructure is critical to long‑term grid reliability — especially in the most severely contaminated environments where even extended-creepage insulators may be inadequate.
Our XWP3-70 anti-pollution insulator suspension 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 pollution‑related flashovers in severe industrial and coastal zones cause significant financial losses, public safety risks, and extended outages that standard insulators cannot prevent.
That is why the XWP3-70 anti-pollution insulator suspension is specifically engineered with an ultra-long 450mm creepage distance — the longest in the 70kN anti-pollution class — combined with larger 280mm diameter, 160mm spacing, and higher electrical ratings to deliver reliable performance where even 400mm creepage insulators may fail.
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 XWP3-70 anti-pollution insulator suspension (brown or gray) is available with short lead times.
Contact us today to discover how the XWP3-70 anti-pollution insulator suspension can strengthen your grid reliability in the most severely contaminated environments.
XWP2-70 vs. XWP3-70 Anti-Pollution Insulators — Comparison
| Parameter | XWP2-70 (U70BLP) | XWP3-70 (U70BLP) | Advantage |
| Diameter D | 255 mm | 280 mm | +25 mm (+10%) |
| Spacing H | 146 mm | 160 mm | +14 mm (+10%) |
| Creepage Distance | 400 mm | 450 mm | +50 mm (+12.5%) |
| Net Weight | 5.9 kg | 6.7 kg | +0.8 kg (minimal for +50mm creepage) |
| Dry Withstand Voltage | 80 kV | 80 kV | Identical |
| Wet Withstand Voltage | 42 kV | 42 kV | Identical |
| Lightning Impulse | 120 kV | 120 kV | Identical |
| Puncture Voltage | 120 kV | 120 kV | Identical |
| Best Application | Heavy industrial / coastal | Severe industrial / extreme coastal / desert | Maximum pollution performance |
Anti-Pollution Series Comparison — Creepage Distance Overview
| Insulator Type | Creepage Distance | Relative to Standard | Best Application |
| Standard 70kN | 300 mm | Baseline | Mild pollution / rural |
| XWP2-70 | 400 mm | +100 mm (+33%) | Heavy industrial / coastal |
| XWP3-70 | 450 mm | +150 mm (+50%) | Severe industrial / extreme coastal / desert |
