SRPS EN IEC 60947-3:2021

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

Scope

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:
<ul>
<li>addition of critical load current tests for DC switches (see 9.3.9);</li>
<li>addition of requirements for a conditional short-circuit rating for disconnectors, switches, and switch-disconnectors protected by circuit-breakers (see 9.3.7.2);</li>
<li>addition of new categories for high-efficiency motors switching (see Annex A);</li>
<li>addition of new Annex E for connection to aluminium conductors;</li>
<li>addition of new Annex F for power losses measurement.</li>
</ul>

Related directives

NOTE: If the word "harmonized" (marked in green) is not found in the field with the name of the directive, it means that the European standard is not cited in the OJEU.

National regulations and standards