IEC 61439-1:20 20作为IEC 61439-1:20 20 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 61439-1:20 20规定了低压开关设备和控制设备组件的一般定义和使用条件、施工要求、技术特性和验证要求。注:在整个文件中，术语组件（见3.1.1）用于低压开关设备和控制设备组件。为了确定装配符合性，IEC 61439系列第2部分及以后相关部分的要求与本文件引用的要求一起适用。对于第3部分以后未涵盖的组件，第2部分适用。这第三版取消并取代了2011年出版的第二版。它构成技术修订。与上一版相比，此版本包括以下重大技术变更: a)阐明功率电转换器系统、开关模式电源、不间断电源和可调速度功率驱动系统根据其特定产品标准进行测试，但当它们被并入组件中时，该并入是根据IEC 61439系列标准； b)为负载组件内的电路引入组额定电流，并将温升验证重新集中在这一新特性上； c)增加关于DC的要求； d)介绍关于电击防护的I类和II类组件的概念。

IEC 61439-1:2020 is available as IEC 61439-1:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 61439-1:2020 lays down the general definitions and service conditions, construction requirements, technical characteristics and verification requirements for low-voltage switchgear and controlgear assemblies. NOTE Throughout this document, the term assembly(s) (see 3.1.1) is used for a low-voltage switchgear and controlgear assembly(s). For the purpose of determining assembly conformity, the requirements of the relevant part of the IEC 61439 series, Part 2 onwards, apply together with the cited requirements of this document. For assemblies not covered by Part 3 onward, Part 2 applies. This third edition cancels and replaces the second edition published in 2011. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) clarification that power electric converter systems, switch mode power supplies, uninterruptable power supplies and adjustable speed power drive systems are tested to their particular products standard, but when they are incorporated in assemblies the incorporation is in accordance with the IEC 61439 series of standards;
b) introduction of a group rated current for circuits within a loaded assembly and the refocusing of temperature-rise verification on this new characteristic;
c) addition of requirements in respect of DC;
d) introduction of the concept of class I and class II assemblies regarding protection against electric shock.