问ABB Electronic trip unit [ABB 电子断路器元件]

http://www.gkcity.com/DownLoad/dlid-1874.htm http://baike.baidu.com/view/2982488.htm http://blog.soufun.com/12741290/2460559/articledetail.htm http://www.vlongbiz.com/company/fudayefangfang/productdetail/2980792955.html http://www.518ad.com/HtmlFiles/SupplyDemand/2009-7-9/4034321.html 本人不了解，搜了一些网站，看看有用吗