IEC 61439-1 is a standard for low-voltage switchgear and controlgear assemblies, which provides general rules for the design, construction, and testing of these assemblies. The standard is part of the IEC 61439 series, which replaces the IEC 60439 series.
Always purchase Edition 2.1 (2021) or later. Older editions are not recognized for new CE marking or most international tenders.
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Temperature rise is a frequent cause of panel failure. IEC 61439-1 imposes strict temperature limits on terminals, busbars, manual operating handles, and external enclosures to prevent premature aging of insulation and burn injuries to operators. Routine Verification (Section 11)
The RMS value of short-circuit current the panel can handle for a specified duration (e.g., 1 second). Rated Diversity Factor