EMC mains filters are used to reduce interference voltages EMC input filters are a combination of interference suppression chokes and interference suppression capacitors into HF-tested units that have a smaller volume. This makes installation much easier and more convenient for the user. The resulting interference pulses are effectively attenuated by the EMC filters regardless of location. The EN55011 standard (limit values and measurement methods) regulates the use of EMC filters. The mains filter or input filter has an IP20 protection class and is suitable for frequency inverters with a power of 0.75 kW to 75 kW, at a mains voltage of 400 V. EMC mains filters are used, among other things, in three-phase speed motor drives, Sevo drives, inverters or power supplies.