: Ensures the assembly can handle its rated current without damaging insulation or components. Short-Circuit Withstand

Proper installation is vital to maintaining the safety ratings achieved during manufacturer testing. Key guidelines include: 1. Environmental & Physical Positioning IEC 61439 vs IEC 60439 - Schneider Electric Community

First, a critical note: The correct designation is , not "604391". The missing hyphen often leads to dead ends. IEC 60439-1 was the international standard for Low-voltage switchgear and controlgear assemblies – Part 1: Type-tested and partially type-tested assemblies .