IEC 60433:2021适用于具有陶瓷材料绝缘部件的长棒型串绝缘子单元，用于标称电压大于1000 V、频率不大于100 Hz的交流架空电力线。它也适用于变电站中使用的类似设计的绝缘子。本文件适用于长杆类型的陶瓷串绝缘子单元，其两端带有用于与舌片连接的u形夹端配件，或两端带有用于与销球连接的插座端配件。本文件的目的是规定长棒型陶瓷串绝缘子单元的电气和机械特性以及主要尺寸的规定值。第四版取消并取代了1998年出版的第三版。与上一版相比，此版本包括以下重大技术变更: -范围内的措辞由“应”改为“旨在”； -增加了新的规范性参考； -修订第4条的标题，加入新的注释4； -扩展表1以包括更具体的机械失效载荷。

IEC 60433:2021 is applicable to string insulator units of the long rod type with insulating parts of ceramic material intended for use in AC overhead power lines with a nominal voltage greater than 1000 V and a frequency not greater than 100 Hz. It is also applicable to insulators of similar design, used in substations. This document is applicable to ceramic string insulator units of the long rod type, either with a clevis end fitting at both ends for coupling with a tongue, or with a socket end fitting at both ends for coupling with a pin ball. The object of this document is to prescribe specified values for electrical and mechanical characteristics, and for the principal dimensions of ceramic string insulator units of the long rod type. This fourth edition cancels and replaces the third edition published in 1998. This edition includes the following significant technical changes with respect to the previous edition:
- wording in Scope changed from "should" to "are intended to";
- new normative references added;
- title of Clause 4 amended, new Note 4 added;
- Table 1 expanded to include more specified mechanical failing loads.