CBB21-B are non-inductively wound with metallized polypropylene film as the dielectric/electrode with copper-clad steel leads and encapsulated in a plastic case sealed with epoxy resin.

• 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，使用环氧树脂密封在塑料壳中。