EN IEC 60947-3:2021被替代
Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units
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专家解读视频
IEC 60947-3:2020 applies to switches, disconnectors, switch-disconnectors and fuse-combination units and their dedicated accessories to be used in distribution circuits and motor circuits of which the rated voltage does not exceed 1 000 V AC or 1 500 V DC.This fourth edition cancels and replaces the third edition published in 2008, Amendment 1:2012 and Amendment 2:2015. This edition constitutes a technical revision.This edition includes the following significant technical changes with respect to the previous edition:addition of critical load current tests for DC switches (see 9.3.9);addition of requirements for a conditional short-circuit rating for disconnectors, switches, and switch-disconnectors protected by circuit-breakers (see 9.3.7.2);addition of new categories for high-efficiency motors switching (see Annex A);addition of new Annex E for connection to aluminium conductors;addition of new Annex F for power losses measurement.
