IEC 60384-9, EIA 198. Class 1 S3N Capacitors. Ceramic class 1 capacitors S3N dielectric for SMPS, high frequency ballast and snubber circuits. Features. High reliability Low losses High capacitance in small size Kinked leads. Applications. The capacitors to be used in electronic circuits where low losses and high capacitance per volume are essential: SMPS, HF ballast, snubber and high-voltage circuits.