Chokes in horizontal version enable space economising, flat printed circuit board assembly. Storage chokes are used in switching power supplies (switch mode regulators) as intermediate energy storage. These modern supply units offer fundamental advantages compared with older linear regulators: small construction size, low power losses, good efficiency and best no load operation behaviour. In order to achieve these advantages only high quality materials must be used as toroidal core. CALTRON storage chokes achieve their super qualities above all through the use of the special material Molypermalloy, an 80% nickel-iron compound. Compared with the iron powder core material the thermal conduct at high switching frequencies (<200kHz) is excellent. The chokes have an almost constant inductance even with high alternating field modulation and high DC pre-magnetising current. The simple construction enables high performance parameters with low heat development and an optimum price-performance ratio. The customer can select between four closed housings.