... ProtectionIt can be used inindoor system of 50HZ and rated voltage of 3.6KV,7.2Kv,12KV,24KV,40.5KV:Used ... .It is also a necessary accessory for high-voltage switch box,circular circuitcabinet,high Low voltage top-loading transformer substation. Type instruction Basic ... .3Φ51×5374010162025Φ76×53731.54050Φ88×5376380160 XRNT high voltage limit current fuse