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A line choke is used to provide better protection against overvoltages on the line supply and to reduce the harmonic distortion of the current produced by the drive.
The recommended chokes limit the drive line current and they have been developed in line with standard EN 50178 (VDE 0160 level 1 high-energy overvoltages on the line supply).
These chokes should be installed upstream of the drive.
The use of line chokes is recommended in particular under the following circumstances: