Sinus filters are used to convert the output voltage of the frequency converter into a sinusoidal voltage. Sinusoidal shaped output voltage for your frequency inverters. Frequency converters generate high electrical interference signals on the motor cable, which not only disturb the load, but also increase the insulation load on the motor. A sine-wave filter, which reduces these interfering signals, provides a remedy. In addition, the voltage peaks are attenuated as well as the electromagnetic compatibility (EMC), which promises a longer service life. The filters are connected between the frequency converter and the motor in the motor cable. Compared to a line filter, the sinusoidal filter has a low cut-off frequency.