Applies to auxiliary contact units associated (or intended to be associated) with circuit-breakers for overcurrent protection, and with residual current operated circuit-breakers with or without integral overcurrent protection for household and similar installations, having a rated voltage not exceeding 440 V a.c. and 250 V d.c., and a rated current not exceeding 10 A. This consolidated version consists of the first edition (1999) and its amendment 1 (2002). Therefore, no need to order amendment inaddition to this publication.