ZCAT Series Clamp Filters TDK ZCAT Series Clamp Filters for cable feature unique plastic cases that ensure simple, convenient installation and include a self-holding mechanism to prevent slippage on cables. A ferrite core provides excellent absorption of high-frequency EMC. The ZCAT series is highly effective against common mode EMC without adverse affect on signal quality and their large core size prevents saturation during large signal surges. Typical applications include personal computers, word processors, monitors, hard disk drives, digital telephones, audio devices, electronic musical instruments, video games, copiers, and facsimiles.