IEC 60364-4-43:2023提供了以下要求: -保护带电导体、PEN导体、PEM导体和PEL导体免受过电流引起的有害影响； -协调防止过电流的措施。 第四版取消并取代了2008年出版的第三版。本版构成技术修订版。 与上一版相比，此版本包括以下重大技术变更: a）该标准已重新构建，见下表1（IEC 60364？4？43:2008与本文件的对应关系）； b)“自动断开电源”措施已被指定为防止过电流的首选措施； c)除“自动切断供应”措施外的所有措施均已转入新的规范性附件，以表明这些措施仅在某些应用中和某些有限条件下可用（见附件A、附件B和附件E）；d)增加了新的条款"术语和定义"； e)增加了中性点或中点导体（有和没有三次谐波）保护的新要求。

IEC 60364-4-43:2023 provides requirements for:
- protection of live conductors, PEN conductors, PEM conductors, and PEL conductors against the harmful effects caused by overcurrent;
- coordination of measures for protection against overcurrent.
This fourth edition cancels and replaces the third edition published in 2008. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) the standard has been restructured, see Table 1 (Correspondence between IEC 60364？4？43:2008 and this document) below;
b) the measure "automatic disconnection of supply" has been designated as the preferred measure for protection against overcurrent;
c) all measures except the measure "automatic disconnection of supply" have been transferred into new normative annexes to indicate that these measures are usable in certain applications and under certain restricted conditions only (see Annex A, Annex B and Annex E);
d) a new clause "Terms and definitions" has been added;
e) new requirements have been added for the protection of the neutral or mid-point conductor (with and without triplen harmonics).