IEC 61558-2-26:2013涉及变压器、电源单元和开关模式电源单元的安全性，所有这些都是为了在电气装置中通过调节输出电路上的输出电压和/或其他电气特性而不受变压器、电源单元和开关模式电源单元影响的中断来节约能源和其他目的。请国家委员会注意，设备制造商和测试组织在新的、修订的或修订的IEC出版物出版后可能需要一个过渡期，以便根据新的要求制造产品，并为其进行新的或修订的测试做好准备。 委员会建议，该出版物的内容应在出版之日起12个月内通过，以便在全国范围内实施。 本出版物应与IEC 61558-1:20 05一起阅读。

IEC 61558-2-26:2013 deals with the safety of transformers, power supply units and switch mode power supply units all for saving energy and other purposes in electrical installations by adjusting the output voltage and/or other electrical characteristics on the output circuits without interruption affected by the transformers, power supply unit and switch mode power supply unit. The attention of National Committees is drawn to the fact that equipment manufacturers and testing organizations may need a transitional period following publication of a new, amended or revised IEC publication in which to make products in accordance with the new requirements and to equip them for conducting new or revised tests. It is the recommendation of the committee that the content of this publication be adopted for implementation nationally not earlier than 12 months from the date of publication.

This publication is to be read in conjunction with IEC 61558-1:2005.