1, insulation class for class B, protection grade for IP21; 2, generator base for casting structure; According to customer need ... 20.8150050STC-5050/62.540090.20.8150050ST/STC series three-phase ac synchronous generator applies to rural, urban, site, mountainous etc ... features below:1, insulation class for class B, protection grade for IP21;2, generator base for casting structure; According to ...