Schaffner fn 406 ultra compact emc filter pcb mounting schaffner emc fn 406 05 02 a 05a single phase emc filter in a compact pcb mounting body the features and performance of these components make them suitable for a wide range of applications such as single phase power supplies switch mode power supplies test and measurement equipment small to medium size machinery schaffner emc fn406 05 02 05a ultra compact emi pcb filter