... Earthing switch with rapid open-close operation function has such capacity on short circuit current.7. Secondary wiring will be buried ... in metal channel to prevent damages from internal failures. Technical parameters ItemUnitValueRated voltageKV3.6,7.2, ... 1250,1600,2000,2500,3150specified short circuit drop-out currentKA20, 25, 31.5,40,50Rated short circuit making currentKA50, 63, ...