CBB21 are non-inductively wound with metallized polypropylene film as the dielectric/electrode with copper-clad steel leads and epoxy resin coating.

• CBB21为无感结构，用金属化聚丙烯膜作为电介质／电极绕制而成，导线采用镀锡铜包钢线，使用环氧树脂包封。