Switchgear system USN

USN cubicles are used in indoor switchgears and distribution centers for 6 (10) kV (USN 100 series), 12 (17.5) kV (USN 150 series), 24 kV (USN 170 series) voltage 50/60 Hz frequency electrical power distribution, line overload and short circuit protection.

  • Cubicles are equipped with vacuum or SF gas circuit breakers of various manufacturers.
  • Construction of three high voltage compartments with draw-out circuit breakers

  • Type tested according IEC62271-200

  • Designed for high power regional substation switchgears

  • Make-type earthing switch

  • One side maitenance

  • Operation of all switching devices with front door closed

  • Complete air insulation of all switchboard live parts

  • IP41 degree of protection on the external housing

  • Constructed to withstand the overpressures caused by the internal arc up to 50kA/1s

  • Mechanical outside door interlock ensures safe maintenance