... Technical parameters of 12kv switchgearItemUnitValueRated voltageKV12Rated frequencyHz50/60Rated insulation level1 min power frequency withstand voltageKV42 (isolation fracture: 48)Rated lightning impulse ... withstand voltage75 (isolation fracture: 85)Rated currentA630,1250,1600,2000,2500,3150,4000,5000specified short ...