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In general, chokes are inductive passive components that are mainly used in the power supply of electrical and electronic devices or systems as well as in power electronics (power quality, regenerative systems, intelligent drive technology).An inductor is a coil that is used for damping, interference suppression, energy storage and distribution, commutation, current limitation or for suppressing undesired frequencies, among other things. It consists of at least one winding of a current conductor (single-phase choke) through which the full load current of the circuit flows. In addition to these 1AC chokes, typical 3-phase chokes are also used.The windings of the respective chokes consist, for example, of enamelled copper wire, high-frequency wire or aluminium strip or aluminium wire. The windings are wound over a coilformer and covered with special insulating materials. (Compliance with clearance and creepage distances). In addition, chokes are usually equipped with a soft magnetic core. (Except for air restrictors). The soft magnetic core consists of e.g. grain-oriented or cold-rolled electrical steel. Due to the number and arrangement of the windings, the design and the core and winding material, the value of the inductance - also called self-inductance or self-inductance - specified in[Henry] with the letter L. (value in mH or µH).