IEC 60309-4:2006+A1:2012 applies to self-contained products that combine within a single enclosure, a socket-outlet or connector according to IEC 60309-1 or IEC 60309-2 and a switching device, with a rated operating voltage not exceeding 1 000 V d.c. or a.c. and 500 Hz, and a rated current not exceeding 800 A, primarily intended for industrial use, either indoors or outdoors. These accessories are intended to be installed by instructed persons (Amendment 1:2001 of IEC 60050-195:1998, 195-04-02) or skilled persons (Amendment 1:2001 of IEC 60050-195:1998, 195-04-01) only. These products may incorporate an interlock and/or protective devices. It bears the edition number 1.1. The technical content is therefore identical to the base edition and its amendment and has been prepared for user convenience. A vertical line in the margin shows where the base publication has been modified by amendment 1. Additions and deletions are displayed in red, with deletions being struck through. This consolidated version consists of the first edition (2006) and its amendment 1 (2012). Therefore, no need to order amendment in addition to this publication.