... 1 (1991),GB3859, GB388 2.10-1000Kw 3.For paper making, metallurgy, printing and dyeing industry (*^__^*)The equipments ... electric furnace control system using silicon-controlled AC-DC power conversion theory, when the accident such as ... , the capacity of the furnace and the melting speed required.Our market is not only at home, ... some countries in Africa and Southern Asia.- DC motor speed thyristor tester