This edition includes the following significant technical changes with respect to the previous edition: editorial changes according to ISO/IEC directives Part 2, alignments with IEC 60947-1:2020: markings ("s", "sol", "r" or "f"); constructional requirements including material requirements; requirements for screwless terminals; measurement method of the pole impedance; EMC requirement and testing; procedure to determine data for electromechanical CPS’s used in functional safety applications.