IEC 60947-3:2008

The contents of the corrigendum of August 2001 have been included in this copy.

States the characteristics of the equipment, the conditions with which the equipment shall comply (operation and behaviour in normal service, operation and behaviour in case of specified abnormal conditions, dielectric properties) the test for confirming that these conditions have been met and the methods to be adopted for these tests; the information to be marked on the equipment or made available by the manufacturer, e.g. in the catalogue. This publication supersedes IEC 60408 (1985) and should be read in conjunction with IEC 60947-1 (1988).

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. The contents of the corrigendum of October 2021 have been included in this copy.