... various kinds of Thyristor, such as KP Phase Control Thyristors, Fast-Turn-off Thyristor, High Frequency Thyristor, Rotation Thyristors. ... hermetic glass-metal seal selectable. 2) Disc type phase control thyristor or silicon control rectifier (SCR), 5A ~ 5000A, ... hermetic metal case with ceramic insulator. 3) Rotary type phase control thyristor or silicon control rectifier (SCR), 300A ~ 500A, 600V ...