Schaffner FN2030 Series EMI Filters Schaffner FN2030 Series EMI Filters feature current ratings from 1 to 30A, high performance filter attentuation, and high differential-mode attenuation. They are available in medical and safety versions, and with optional overvoltage protection. Applications for Schaffner FN2030 EMI Filters include electrical and electronic equipment, consumer goods, household equipment, medical equipment, and various noisy applications requiring high filter performance.