KEMET KEMET PFR Polypropylene Film Capacitors

KEMET PFR polypropylene film capacitors use a polypropylene film with attached metal foil electrodes. The radial leads of tinned wire are electrically welded to the winding and the entire PFR capacitor is encapsulated in self-extinguishing material that meets the requirements of the UL 94V-0. The KEMET PFR film capacitors are designed for high speed applications requiring low losses at high frequencies and high dU/dt typical of electrical ballasts, TV or video and telecommunications applications. The KEMET metallized polypropylene (plastic) film capacitors feature very low losses and the lowest dielectric absorption of all film dielectric materials. KEMET capacitors have a very high dielectric strength and high insulation resistance with a negative temperature coefficient. KEMET metallized plastic film capacitors exhibit self healing characteristics that actually work if a conducting particle or voltage surge punctures the dielectric, an arc occurs at the point of failure, thus melting the surrounding metal and insulating the area of the breakdown. In metallized plastic film dielectrics a breakdown causes a reduction of the insulation resistance due to a higher carbon deposit in the breakdown channel compared to paper film dielectrics.