Regulations on how the assembly handles heat generated by components under load.
To achieve TTA status, an assembly design must pass seven specific laboratory tests:
: The official IEC 61439 series must be purchased from the IEC Webstore or your country's national standards body (e.g., ANSI in the US, BSI in the UK, DIN in Germany). Some organizations may provide access to standards through a subscription service. For general information and guidance, manufacturers like ABB and Eaton often publish useful overviews and white papers explaining the new standard [17†L0-L1].
Data based on information from DIN and BEAMA [11†L16-L21][17†L25-L35]. iec 60439-1 standard pdf
Using the withdrawn IEC 60439-1 for new designs or compliance verification is not recommended. The successor standard is the backbone for modern low-voltage switchgear and controlgear assemblies.
Manufacturers who produced components for IEC 60439-1 boards (e.g., specific busbar systems, draw-out cassettes) still need the standard to ensure mechanical and electrical compatibility.
If you are looking for an IEC 60439-1 standard PDF for a new project, you should be aware that . It was withdrawn and completely replaced by the IEC 61439 series . Regulations on how the assembly handles heat generated
: Tests the physical and thermal capability of the busbars and brackets to survive massive electromagnetic forces during a short circuit, defined by:
Even though it's technically obsolete, engineers still reference the IEC 60439-1 PDF Legacy Systems:
Standards for shielding against electromagnetic interference. 4. The Transition: From IEC 60439-1 to IEC 61439-1 For general information and guidance, manufacturers like ABB
– Experienced engineers shared summary tables (but never full copyrighted PDFs). One kind member emailed her a comparison document between 60439-1 and 61439-1—a legal, helpful resource.
In some countries (e.g., British Library, Library of Congress), you can view the standard on-premises for free. You cannot take the PDF away, but you can take notes.