BAS EN 60947-4-2:2013

IEC 60947-4-2:2011 applies to a.c. semiconductor motor controllers and starters, which may include a series mechanical switching device, intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V a.c. This standard characterizes a.c. semiconductor motor controllers and starters with and without bypass means. This third edition replaces the second edition published in 1999 and its Amendments 1 (2001) and 2 (2006). It is a technical revision. This edition includes the following significant technical changes with respect to the previous edition and its amendments:<br /> - updated EMC normative references and associated requirements,<br /> - new references to IEC 60947-1,<br /> - marking of electronic relays without thermal memory,<br /> - marking of tripping time at 0 °C ambient or below,<br /> - new test requirements for limits of operation of time-delay overload relays,<br /> - new classes of overload current withstand time,<br /> - damp heat, salt mist, vibration and shock tests,<br /> - short-circuit test in the smallest enclosure,<br /> - update of the routine and sampling tests.<br />The contents of the corrigendum of July 2012 have been included in this copy. <br /><br />This publication is to be read in conjunction with <a href=''http://webstore.iec.ch/webstore/webstore.nsf/ArtNum_PK/44978''>IEC 60947-1:2007</a>.