Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units (IEC 60947-3:2020)

This part of IEC 60947 applies to switches, disconnectors, switch-disconnectors and fusecombination 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. NOTE 1 Accessories are interconnecting units, extended terminals, internal coils, auxiliary contacts, motor operator, etc. offered as options with the basic unit. This document does not apply to equipment coming within the scope of IEC 60947-2, IEC 60947-4- 1 and IEC 60947-5-1. Particular requirements for switches, disconnectors, switch-disconnectors and fusecombination units for use in photovoltaic (PV) DC applications are given in Annex D. Specific requirements for LV switchgear intended for the connections of aluminium conductors are given in Annex E. Guidance on measurement of power loss is provided in Annex F. This document does not include the additional requirements necessary for electrical apparatus for explosive gas atmospheres