Chokes in horizontal version enable space economising, flat printed circuit board assembly. All choke types comply with the guidelines of EN 60938-2. In combination with suitable capacitors high quality interference suppression filters against parasite interference influences are achieved. Main application fields are: general purpose filtering of parasite disturbance factors above all with symmetric interferences e.g. in frequency converters, switch mode power supplies, automotive electronics etc. Frequently they are also used in combination with current compensated interference suppression chokes. Optimum adaptation of core materials and technical design guarantee the best possible compliance to the world-wide hig requirements with the smallest volume. The simple construction enables high performance parameters with the smallest heat development and an optimum.