Including annexes, informative parts, and related standards like IEC 61439 (which might be an updated version) could add value. The user might not know that IEC 60439-1 has been replaced or updated. It would be helpful to mention that and suggest checking for the latest version.
The IEC 60439-1 standard covers various aspects of low-voltage switchgear and controlgear assemblies, including: iec 60439-1 standard pdf
on the differences between residential and industrial circuit breaker standards. Schneider Electric Blog iec 60439-1 standard pdf
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