Standard requirements

The main definitions and requirements about selectivity from the international Standards.

Here you can find the main information and definitions about selectivity from the standards:

  • IEC 60947-1
    “Low-voltage switchgear and controlgear – Part 1: General rules”.
  • IEC 60947-2
    “Low-voltage switchgear and controlgear – Part 2: Circuit-breakers”.
  • IEC 60947-2 – Annex A
  • IEC/TR 61912-2
    “Low-voltage switchgear and controlgear – Over-current protective devices – Part 2: Selectivity under over-current conditions”.
  • Technical Guide CEI 99-4
    “Guidelines for the execution of medium/low voltage electrical substations of final customers/users”.

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