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.