... rpm 600,720,750,900,1200,1800 frequency 50,60Hz 1FC6 Brushless Alternator,Rating Capacity25KVA-4285KVAvoltage400V,450Venvironment temperature45oCpoles4,6,8,10rpm600 ... is less than 5% The highest protection degree is IP54. 1FC6/J6 Brushless synchronous generator