• Electrical characteristics (AC or DC, Voltage...) of the installation for which the CB is intended.
  • Its environment: ambient temperature, in a kiosk or switchboard enclosure, climatic conditions, etc.
  • Presumed short-circuit current at the point of installation.
  • Characteristics of the protected cables, busbars, busbar trunking system and application (distribution, motor...)
  • Co-ordination with upstream and/or downstream device: Discrimination (selectivity), cascading, coordination with switch disconnector, contactor.
  • Operational specifications: requirements (or not) for remote control and indication and related auxiliary contacts, auxiliary tripping coils, connection.