Insulated Ceramic Tube in EV Fuses

For standard 400V-class systems or low-current auxiliary circuits, 95% alumina ceramic tubes offer sufficient electrical insulation and mechanical strength at an excellent cost-performance ratio. However, for 800V/1000V high-voltage main circuits or fast-charging fuses requiring extremely high breaking capacity (over 100kA), we strongly recommend using alumina with 99% purity or higher. Higher purity significantly enhances dielectric strength and reduces energy loss at high temperatures, ensuring zero dielectric breakdown even under the impact of extreme high-voltage arcs.

Cracking during press-fitting usually stems from geometric tolerance deviations at the tube ends or stress concentration. We address this issue through two key measures: first, we use precision diamond centerless grinding to strictly control outer diameter and coaxiality tolerances within ±0.01mm; second, we apply precise radius (R-angle) or 45° chamfers to both ends of the tube to eliminate stress concentration points, thereby significantly improving the yield rate for your downstream automated assembly processes.

We possess comprehensive capabilities in mold design, cold isostatic pressing (CIP), and precision forming. Upon receipt of your 3D/2D engineering drawings, we can complete the engineering assessment and sample production within 10–15 working days. For products approved for mass production, we can achieve high-volume delivery within 10–15 days, utilizing our mold tooling and high-efficiency dry-pressing production lines.

We implement batch-to-batch traceability starting right at the granulation powder stage. During sintering, we utilize fully automated, computer-controlled continuous tunnel kilns, eliminating the temperature and density variations often caused by intermittent kilns. Furthermore, finished products undergo 100% inspection via fully automated optical sorting equipment, ensuring zero defects regarding dimensional accuracy and surface quality.