CBB21-B型电容器为无戌结构，用金属化聚丙燃膜作电介质/电极绕制而成，导线采用镀锡铜包钢线，使用环氧树酯密封在塑料壳内，外观一致性好，高频损耗小，绝缘电阻高，自愈性好，寿命长，广泛用于大电流以及高频，直流，交流和脉动电路中。CBB21-Btypecapacitorarenon-inductivelywoundwithmetallizedpolyproynlenefilmasthedielectric/eclectrodewithcopper-cladsteelleadsandencapsulatedinaplasticcasesealedwithepoxyresin,theidenticalouterinsulationresistance,longlifeduetoself-healingeffect.widelyuesdinhighfrequency,DC,AC,andpulsecircuits.)