IEC 62271-105:2021 RLV包含官方IEC国际标准及其红线版本。Redline版本仅提供英文版本，为您提供了一种快速简单的方法来比较IEC官方标准与其以前版本之间的所有变化。 IEC 62271-105:2021适用于公共和工业配电系统的三极装置，这些装置是开关的功能组件，由开关或开关隔离开关和限流熔断器组成，设计为能够 -在所述额定电压下断开高达并包括所述额定短路断开电流的任何电流； -在额定电压下制造额定短路分断电流所施加的电路。 这第三版取消并取代了2012年出版的第二版。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: -该文件已更新为与IEC 62271-1:20 17第二版保持一致； -已删除额定TRV（TRV仅为测试参数），如最新修订的IEC 62271-100； -在为实现开关-熔断器组合预期的功能而表达的要求与仅当功能由独立设备执行时相关的要求之间引入了区别。目标是当功能在这样的程序集中实现时，避免与处理程序集的标准的需求重复或冲突。

IEC 62271-105:2021 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. IEC 62271-105:2021 applies to three-pole units for public and industrial distribution systems which are functional assemblies of switches composed of switches or switch-disconnectors and current-limiting fuses designed so as to be capable of
- breaking, at the rated voltage, any current up to and including the rated short-circuit breaking current;
- making, at the rated voltage, circuits to which the rated short-circuit breaking current applies.
This third edition cancels and replaces the second edition published in 2012. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
- the document has been updated to be in alignment with the second edition of IEC 62271-1:2017;
- rated TRV has been removed (TRV is only a test parameter), as in the latest revision of IEC 62271-100;
- differentiation has been introduced between requirements expressed for fulfilling the function expected from a switch-fuse combination, from requirements only relevant when the function is performed by a stand-alone device. The goal is to avoid duplication or conflicts of requirements with a standard dealing with assemblies, when the function is implemented within such an assembly.