Schaffner fn 402 0 5a single phase filter pcb mount schaffner emc fn 402 0 5 02 a pcb mounting single phase filter that is a practical solution to reducing emi rfi typical applications include electrical and electronic equipment small to medium size machinery single phase power supplies switch mode power supplies test and measurement equipment etc schaffner emc fn 402 0 5 02 0 5a pcb mount filter