IEC 62505-1:20 16适用于单极和两极交流（AC）断路器，这些断路器设计用于牵引系统的室内或室外固定安装，并在IEC 60850:2014中规定的交流线电压和频率下运行。与上一版相比，主要变化如下: -反映所引用标准的最新版本，并删除IEC 62271系列中已包含的文本； -将范围扩大至包括单极和两极断路器； -根据IEC 62497-1:20 10的变更返工表1。 本出版物应与IEC 62271-1:20 07和IEC 62271-100:2008一起阅读。

IEC 62505-1:2016 is applicable to single-pole and two-pole alternating current (AC) circuit-breakers which are designed for indoor or outdoor fixed installations in tractions systems, and operated with an AC line voltage and frequency as specified in IEC 60850:2014. The main changes with respect to the previous edition are as follows:
- reflect the latest versions of standards referenced and remove text already included in the IEC 62271 series;
- extend the scope to include single-pole and two-pole circuit-breakers;
- rework Table 1 according to the changes of IEC 62497-1:2010.

This publication is to be read in conjunction with IEC 62271-1:2007, and IEC 62271-100:2008.