IEC 60947-4-2:2020 applies to semiconductor motor controllers, starters and soft-starters which can include a series mechanical switching device, intended to be connected to circuits the rated voltage of which does not exceed 1 000 V AC. This fourth edition cancels and replaces the third edition published in 2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: scope exclusions; editorial correction of notes and hanging paragraphs; reference to IEC 62683-1; safety aspects related to: general aspects; limited energy circuits; electronic circuits; mention of dedicated wiring accessories; power consumption measurement; alignment to IEC 60947-1:2020.