Pajisje shpërndarëse dhe kontrolli për tension të ulët - Pjesa 3: Çelësat, ndarësit, çelësat ndarës dhe njësi të kombinuara me siguresa

Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units

Asnjë informacion i shtuar.

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.