... : 1) Stud type phase control thyristers or silicon control rectifier (SCR), 5A~500A, 100V~5000V, hermetic metal case ... selectable. 2) Disc type phase control thyristor or silicon control rectifier (SCR), 5A ~ 5000A, 100V ~ 5000V, hermetic metal case ... In accordance with IEC international electrical committee standard Typical applications DC motor controls Controlled DC power supplies AC switch ...