... research and development;avalanche thyristors;(TL371-250,TL371-320)phase control thyristor;(T212-10,T222-20,T232-20,T242-50,T151 ... ,ssr,jgx-1,jgx-3j)Each kind of necessary radiator;SS,SF,SZ,SL,PRDRectification bridge series;SQL5A-500A QL5A-500 ...