DS/EN IEC 61439-2:2021

Low-voltage switchgear and controlgear assemblies – Part 2: Power switchgear and controlgear assemblies

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This part of IEC 61439 defines the specific requirements for the power switchgear and
controlgear assembly (abbreviated ‘PSC-assembly’ throughout this document see 3.1.101) as
• assemblies for which the rated voltage does not exceed 1 000 V AC or 1 500 V DC;
• assemblies designed for a nominal frequency of the incoming supply or supplies not
exceeding 1 000 Hz;
NOTE 1 – Frequencies above 1 kHz are considered as high frequencies, see also IEC 60664-1:2007,
to take into account additional constraints to insulation coordination.
• assemblies intended for indoor and outdoor applications;
• stationary or movable assemblies with or without enclosures;
• assemblies intended for use in connection with the generation, transmission, distribution
and conversion of electrical energy, and for the control of equipment consuming electrical
energy and for associated data processing;
• assemblies designed for use under special service conditions, for example in ships and in
rail vehicles, provided that the other relevant specific requirements are complied with;
NOTE 2 – Supplementary requirements for assemblies in ships are covered by IEC 60092-302-2.
This document also applies to assemblies for use in photovoltaic installations, designated as
photovoltaic assemblies (PVA). The particular characteristics, specific service conditions and
the requirements for PVA’s are included in Annexes DD, EE and FF.
This document provides supplementary requirements for PSC-assemblies intended for use as
part of the electrical equipment of machines and can be applied in addition to the
requirements given in IEC 60204-1.
This document applies to all assemblies whether they are designed, manufactured and
verified on a one-off basis or fully standardised and manufactured in quantity.
The manufacture and/or assembly can be carried out by an entity other than the original
manufacturer (see 3.10.1 of IEC 61439-1:2020).
This document does not apply to individual devices, for example, circuit-breakers, fuse
switches and self-contained components such as, motor starters, power electronic converter
systems and equipment (PECS), switch mode power supplies (SMPS), uninterruptable power
supplies (UPS), basic drive modules (BDM), complete drive modules (CDM), adjustable speed
power drives systems (PDS), stand-alone energy storage systems (battery and capacitor
systems), and other electronic equipment which comply with their relevant product standards.
This document describes their integration into a PSC-assembly or an empty enclosure used
as a part of a PSC-assembly.
For some applications, such as, explosive atmospheres, functional safety, there may be a
need to comply with the requirements of other standards or legislation in addition to those
specified in the IEC 61439 series.This document does not apply to the specific types of assemblies covered by other parts of
IEC 61439. For assemblies not covered by other parts, this part applies.
Unless local legislation details additional requirements, equipment within the scope of this
document, which complies with this document, is deemed to meet essential safety
requirements. This includes fully verified specifier options, for example user choice of
protection against accidental contact with hazardous live parts of IPXXB or IP3XD. Where
special requirements are agreed between the user and manufacturer, that are not fully
specified within this document, for example, (i) part of the assembly is outside the scope of
this document, (ii) exceptional vibration is present at the place of installation, (iii) exceptional
voltage variations occur in service, or (iv) possible adverse effects from sonic or ultrasonic
sources, a risk assessment and/or additional or more severe verifications may be required to
demonstrate that the essential safety requirements have been fulfilled.

Number of pages: 62

Published: 2021-05-28

Date of approval: 2021-05-25

International relationships : EN IEC 61439-2:2021 IDT IEC 61439-2:2020 IDT

ICS: 29.130.20 - Low voltage switchgear and controlgear

Item number: M306639



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

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