Harmonics: are they an issue for soft start applications? 

Harmonics are voltages and currents that create unwanted heating in motors, cables and other equipment. Harmonics can also disrupt operation of electronic equipment.

Harmonic generation by soft starters is insignificant and only occurs during starting or soft stopping. IEC 60947-4-2 (8.3.2.1.1) states “harmonic emissions are of short duration during starting, and there are no significant emissions in the FULL-ON state.

No special actions or filtering are required.

All AuCom soft starters comply with the EMC directive on radiofrequency emissions and immunity.