Switchgear system USN

USN cubicles are used in indoor switchgears and distribution centers for 10 kV (USN 100 series), 12 kV (USN 120 series), 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 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