IEC 61991:2019作为IEC 61991:2019 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 61991:2019定义了机车车辆上用于保护人员免受电击的电气装置和设备的设计和制造中的要求。本文件适用于铁路运输系统的机车车辆、由外部电源供电的公路运输系统（如无轨电车）、磁悬浮运输系统以及安装在这些系统中的电气设备。第二版取消并取代了2000年出版的第一版。它基于EN 50153:2014。与上一版相比，此版本包括以下重大技术变更:a)几种参比标准品的替换。 b)介绍了几个术语和缩写术语； c)特殊国情列入附件

IEC 61991:2019 is available as IEC 61991:2019 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 61991:2019 defines requirements applied in the design and manufacture of electrical installations and equipment to be used on rolling stock to protect persons from electric shocks. This document is applicable to rolling stock of rail transport systems, road transport systems if they are powered by an external supply (e.g. trolley buses), magnetically levitated transport systems, and to the electrical equipment installed in these systems. This second edition cancels and replaces the first edition, published in 2000. It is based on EN 50153:2014. This edition includes the following significant technical changes with respect to the previous edition:
a) replacement of several reference standards.
b) several terms and abbreviated terms are introduced;
c) special national conditions are included in annex