DS/EN 61439-3:2012/AC:2019

Low-voltage switchgear and controlgear assemblies – Part 3: Distribution boards intended to be operated by ordinary persons (DBO)

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Harmonized under:
  • Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility (recast) Text with EEA relevance

Harmonized standards:


IEC 61439-3:2012 defines the specific requirements for distribution boards intended to be operated by ordinary persons (DBO). DBOs have the following criteria: – intended to be operated by ordinary persons (e.g. switching operations and replacing fuse-links), e.g. in domestic (household) applications; – outgoing circuits contain protective devices, intended to be operated by ordinary persons, complying e.g. with IEC 60898-1, IEC 61008, IEC 61009, IEC 62423 and IEC 60269-3; – rated voltage to earth does not exceed 300 V a.c.; – rated current (Inc) of the outgoing circuits does not exceed 125 A and the rated current (InA) of the DBO does not exceed 250 A; – intended for the distribution of electrical energy; – enclosed, stationary; – for indoor or outdoor use. This first edition cancels and replaces the first edition of IEC 60439-3 (1990), Amendment 1 (1993) and Amendment 2 (2001). It constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 60439-3 (including the amendments): – alignment with IEC 61439-1:2011. This publication is to be read in conjunction with IEC 61439-1:2011.

Number of pages: 5

Published: 2019-05-02

Date of approval: 2019-04-29

International relationships: EN 61439-3:2012/AC:2019-04 IDT IEC 61439-3:2012/COR2:2019 IDT

ICS: 29.130.20 - Low voltage switchgear and controlgear

Item number: M333351



  • CLC/SR 121B
  • IEC/TC 121/SC 121B

Danish committee