IEC 61643-331:2020作为IEC 61643-331:2020 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 61643-331:2020是金属氧化物压敏电阻器(MOV)的测试规范，用于电力线、电信或信号电路中高达1 000 V AC或1 500 V DC的应用。它们旨在保护设备或人员或两者免受高瞬态电压的影响。本文件适用于具有两个电极和混合电涌保护组件的MOV。本文件也不适用于安装及其对MOV特性的影响。给定的特性仅适用于仅以测试描述的方式安装的MOV。这第三版取消并取代了2017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: -变阻器MCOV额定值保证测试； -能量等级测试(2ms)； -修订了介电强度和绝缘电阻测试。

IEC 61643-331:2020 is available as IEC 61643-331:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 61643-331:2020 is a test specification for metal oxide varistors (MOV), which are used for applications up to 1 000 V AC or 1 500 V DC in power lines, or telecommunication, or signalling circuits. They are designed to protect apparatus or personnel, or both, from high transient voltages. This document applies to MOVs having two electrodes and hybrid surge protection components. This document also does not apply to mountings and their effect on the MOV’s characteristics. Characteristics given apply solely to the MOV mounted only in the ways described for the tests. This third edition cancels and replaces the second edition published in 2017. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- a Varistor MCOV rating assurance test;
- an energy rating test (2ms);
- revised Dielectric strength and insulation resistance tests.