“IEC 61439-1:2020, 9.1.3”. A specific assembly standard may not require, and hence need not call up, a general rule where it is not applicable, or it may can add requirements if the general rule is deemed inadequate in the particular case, but it may not deviate from it unless there is substantial technical justification detailed in the ...

IEC 61439-1:2020 lays down the general definitions and service conditions, construction requirements, technical characteristics and verification requirements for low-voltage switchgear and controlgear assemblies.

2022年1月19日 · 内容提示： IEC 61439-1 ® Edition 3.0 2020-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Low-voltage switchgear and controlgear assemblies – Part 1: General rules Ensembles d’appareillage à basse tension – Partie 1: Rè gles gé né rales

Part 1: General rules for low voltage equipment” “Back-up is a coordination of two overcurrent protective devices in series, where the protective device on the supply side, with or without the assistance of the other protective device, trips first in order to prevent any excessive stress on downstream devices”.

2025年3月25日 · 标准名称：低电压开关装置和控制装置装配 – 第1部分: 通用规则 适用范围： 本国际标准规定了低电压开关装置和控制装置装配的一般规则。

IEC 61439-1:2020 lays down the general definitions and service conditions, construction requirements, technical characteristics and verification requirements for low-voltage switchgear and controlgear assemblies. NOTE Throughout this document, the term assembly (s) (see 3.1.1) is used for a low-voltage switchgear and controlgear assembly (s).

2020年5月5日 · IEC 61439-1:2020 lays down the general definitions and service conditions, construction requirements, technical characteristics and verification requirements for low-voltage switchgear and controlgear assemblies.

2014年10月27日 · Low-voltage switchgear and controlgear assemblies - Part 1: General rules 低压开关设备和控制设备组件第1部分:总则

2025年3月22日 · IEC 61439 的本部分规定了低压开关设备和控制设备组件的一般定义和使用条件、构造要求、技术特性和验证要求。 注：在本文件的各个部分中，术语组件（见 3.1.1）用于低压开关设备和控制设备组件。