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IEC 60721-3-9:2024

Classification of environmental conditions - Part 3-9: Classification of groups of environmental parameters and their severities - Microclimates inside products

Standard Details

IEC 60721-3-9:2024 classifies groups of microclimatic conditions, to which components (basic parts, assemblies, built-in units) can be subjected inside products, which are used under the climatic conditions as classified in IEC 60721-3-3 and IEC 60721-3-4.
This second edition cancels and replaces the first edition published in 1993, Amendment 1:1994 and Corrigendum 1:1995. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Clause 2 has been updated;
b) Clause 4 has been re-edited and simplified;
c) Annex A has been revised and updated;
d) a new Annex B has been added and gives the origin of the constitutional diagram for humid air, which is the basis of drawing the climatogram for a microclimate.

General Information

Status : ACTIVE
Standard Type: Main
Document No: IEC 60721-3-9:2024
Document Year: 2024
Pages: 34
Edition: 2.0
  • Section Volume:
  • TC 104 Environmental conditions, classification and methods of test
  • ICS:
  • 19.040 Environmental testing

Life Cycle

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IEC 60721-3-9:2024
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