CBB20 are non-inductively wound with metallized polypropylene film as the dielectric/electrode and copper-clad steel leads and outer wrapping of polyester sealed with epoxy resin.

• CBB20为无感结构，用金属化聚丙烯膜为电介质／电极绕制而成，导线采用镀锡铜包钢线或铜线，外层采用聚酯胶带包裹，两端用环氧树脂密封。