IEC 60947-4-2 Ed. 4.0 b:2020

Low-voltage switchgear and controlgear – Part 4-2: Contactors and motor-starters – Semiconductor motor controllers, starters and soft-starters

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.