IEC 61439-2:20 20定义了电源开关设备和控制设备组件（在本文件中缩写为“PSC组件”，参见3.1.101）的具体要求如下: -额定电压不超过1 000 V AC或1？500伏直流电； -为输入电源的标称频率不超过1 000赫兹而设计的组件； 注1？高于1 kHz的频率被视为高频，另见IEC 60664-1:20 07，5.3.3.2.5，以考虑绝缘配合的附加约束。 -用于室内和室外应用的组件； -带或不带外壳的固定或可移动组件； -用于电能的产生、传输、分配和转换以及用于控制消耗电能的设备和用于相关数据处理的组件；-为在特殊使用条件下使用而设计的组件，例如在船舶和轨道车辆中使用，但须符合其他相关的具体要求； 注2？IEC 60092-302-2涵盖了船舶组件的补充要求。 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)增加用于光伏安装的组件的附件DD、EE和FF； b)明确了内部隔离形式的要求，增加了当隔离形式高于1时，功能单元舱室内所有在功能单元关闭时保持带电的部件应至少防护到IPXXB；c)与IEC 61439-1:20 20的结构一致； d)增加温升验证；(i)通过与参考设计和计算的比较组合，对具有自然冷却和额定高于1 600 A的电路的组件进行温升验证；(ii)具有主动冷却和额定电流高达1 600 A的组件的温升验证； e)考虑具有主动冷却的IP。

IEC 61439-2:2020 defines the specific requirements for the power switchgear and controlgear assembly (abbreviated "PSC-assembly" throughout this document see 3.1.101) as follows:
- assemblies for which the rated voltage does not exceed 1 000 V AC or 1？500 V DC;
- assemblies designed for a nominal frequency of the incoming supply or supplies not exceeding 1 000 Hz;
NOTE 1？Frequencies above 1 kHz are considered as high frequencies, see also IEC 60664-1:2007, 5.3.3.2.5 to take into account additional constraints to insulation coordination.
- assemblies intended for indoor and outdoor applications;
- stationary or movable assemblies with or without enclosures;
- assemblies intended for use in connection with the generation, transmission, distribution and conversion of electrical energy, and for the control of equipment consuming electrical energy and for associated data processing;
- assemblies designed for use under special service conditions, for example in ships and in rail vehicles, provided that the other relevant specific requirements are complied with;
NOTE 2？Supplementary requirements for assemblies in ships are covered by IEC 60092-302-2.
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) addition of Annexes DD, EE and FF for assemblies for use in photovoltaic installation;
b) clarification of the requirements for forms of internal separation and the addition of the requirement, when the form of separation is higher than 1, all parts within the functional unit compartment that remain live when the functional unit is switched off shall be protected to at least IPXXB;
c) alignment with the structure of IEC 61439-1:2020;
d) addition of temperature-rise verification for; (i) temperature-rise verification of assemblies with natural cooling and circuits rated above 1 600 A by a combination of comparison with a reference design and calculation, and; (ii) temperature-rise verification of assemblies with active cooling and rated currents up to 1 600 A;
e) consideration of IP with active cooling.