低压浪涌保护元件 - 第331部分:金属氧化物变阻器（MOV）的性能要求和测试方法

[中文适用范围]： 本部分是用于低压浪涌保护应用（高达1000V AC或1500V DC）的金属氧化物压敏电阻（MOV）的测试规范，适用于电源线路、电信线路或信号电路。该文档旨在保护设备或人员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浪涌保护组件的MOV。本文件不适用于安装件及其对MOV特性的影响。所述特性仅适用于仅按测试描述方式安装的MOV。 [外文原描述]： 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.