... can be used inindoor system of 50HZ and rated voltage of 3.6KV,7.2Kv,12KV,24KV,40.5KV ... also a necessary accessory for high-voltage switch box,circular circuitcabinet,high Low voltage top-loading transformer substation. Type instruction ... 25,31.5,4050,63,80,100,125Installation DimensiosTachnique data TypeUN(KV)IN(A)D×L(mm)Rated break ... Φ76×53731.54050Φ88×5376380160 XRNT high voltage limit current fuse