Electronic converters, used in speed changers both for DC and AC and in SAI, generate electromagnetic interference (EMI), sometimes more commonly called "parasites".

The causes of this disturbance are abrupt changes in voltage and current caused by semiconductor switching. This type of interference usually causes faults with computers, automated programs, number control equipment, etc. In order to filter this type of high frequency disturbance and to comply with the European standards, CIRCUTOR has two components:

EMI filters for the converter system, EMR-xx-xxx.

Chokes to avoid engine cable radiation. These chokes CEM-xx, are attached between the converter and the engine.