UL 3239 High Voltage Silicone Rubber Wire (10kV to 50kV DC)
Superior Dielectric Strength for Mission-Critical High Voltage Systems
CableApex’s UL 3239 series is specifically designed to provide reliable insulation in high-voltage DC environments where standard electronic wires would fail. With voltage ratings spanning from 10kV to 50kV DC, this high voltage silicone wire features an extra-thick insulation layer that effectively prevents arcing and insulation breakdown. Built with 99.99% high-purity oxygen-free tinned copper (OFC), it maintains excellent conductivity and flexibility even at temperatures up to 180°C. This makes it the premier choice for medical X-ray equipment, laser systems, and high-voltage power supplies.
Technical Specifications (UL File E333030)
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AWM Style: UL 3239
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Insulation: High-Performance Silicone Rubber (High Dielectric Strength)
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Temperature Rating: 150°C / 180°C
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Voltage Rating: 10kV – 50kV DC
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Flame Retardancy: Passed UL VW-1 vertical flame test.
Special Property: Excellent resistance to corona discharge and chemical exposure.
UL 3239 Voltage Rating & Dimension Table
| Rated Voltage (DC) | AWG Size Range | Insulation Thickness (mm) | Approx. Outer Diameter (mm) |
| 10kV DC | 24 – 10 AWG | 0.95 – 1.20 | 2.50 – 5.50 |
| 20kV DC | 22 – 14 AWG | 1.65 – 1.90 | 4.00 – 6.20 |
| 30kV DC | 22 – 16 AWG | 2.15 – 2.45 | 5.10 – 7.50 |
| 40kV DC | 20 – 18 AWG | 2.60 – 2.85 | 6.50 – 8.20 |
| 50kV DC | 20 – 18 AWG | 3.10 – 3.40 | 7.80 – 9.50 |
Why Partner with CableApex?
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15-Year Industrial Expertise: Leveraging over a decade of specialized manufacturing experience and our 20-acre production facility in Yangzhou to ensure precision in high-voltage engineering.
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99.99% Pure Copper Guarantee: We use only top-tier tinned copper to ensure your high-voltage systems operate with zero compromise on safety and efficiency.
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Certified Global Traceability: All our UL 3239 cables are manufactured and verifiable under UL File E333030, ensuring compliance with international safety protocols.
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Factory-Direct High Voltage Solutions: Get competitive factory-direct pricing and technical consulting directly from the source to keep your complex projects on track.
