IEC 60309-1:20 21适用于插头、固定或便携式插座和电器入口，以下简称附件，额定工作电压不超过1 000 V DC或1 000 V AC，频率不超过500 Hz，额定电流不超过800 A，主要用于室内或室外工业用途。 本第五版取消并取代了1999年出版的第四版、修正案1:20 05和修正案2:20 12。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: 增加了带百叶窗配件的分类、要求和试验； 指示中性端子和/或接地端子的附加标记； 将术语“连接器”替换为术语“便携式插座”。

IEC 60309-1:2021 applies to plugs, fixed or portable socket-outlets and appliance inlets hereinafter referred to as accessories, with a rated operating voltage not exceeding 1 000 V DC or 1 000 V AC with a frequency not exceeding 500 Hz and a rated current not exceeding 800 A, primarily intended for industrial use, either indoors or outdoors.
This fifth edition cancels and replaces the fourth edition published in 1999, Amendment 1:2005 and Amendment 2:2012. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:

1. addition of classification, requirements and tests for accessories with shutters;
2. additional marking to indicate neutral terminal and/or earthing terminal;
3. replacement of the term "connector" by the term "portable socket-outlet".