IEC 62041: 2017 is applicable to transformers, reactors and power supply units covered by the IEC 61558 series of standards. This document deals with the electromagnetic compatibility requirements for emission and immunity within the frequency range 0 Hz to 400 GHz. No tests need to be performed at frequencies where no requirements are specified.This third edition cancels and replaces the second edition published in 2010. It constitutes a technical revision.This edition includes the following significant technical changes with respect to the previous edition: the inclusion of a clause on tests in series production; the inclusion of a new clause on measurement uncertainly, and the status of a harmonized standard for this third edition.It has the status of a product family EMC standard in accordance with IEC Guide 107:2009,Electromagnetic compatibility a?? Guide to the drafting of electromagnetic compatibility publications.