This standard is applicable to reverse-blocking three-pole thyristors with cavity-packaged on-state currents of 200A, 500A, and 1000A, and off-state repetitive peak voltages and reverse repetitive peak voltages above 3200V (including 3200V).
JB/T 5839-1991 history
2013JB/T 8950.2-2013 Phase control thyristors.Part 2:Disc devices
1991JB/T 5839-1991 KH series 200A and above case-rated reverse blocking triple pole HT thyristors
JB/T 5839-1991 KH series 200A and above case-rated reverse blocking triple pole HT thyristors was changed to JB/T 8950.2-2013 Phase control thyristors.Part 2:Disc devices.