[国外标准] BS EN 60439-4-2004 Low-voltage switchgear and controlgear assemblies — Part 4 Particular requirement
[国外标准] BS EN 60439-2-2000 Low-voltage switchgear and controlgear assemblies Part 2 Particular requirements
[国外标准] BS EN 60439-1-1999 Low-voltage switchgear and controlgear assemblies — Part 1 Type-tested and partia