This standard is applicable to reverse blocking three-pole thyristors with rated cavity package of 1250A, 1600A, 2000A and 2500A average on-state current.
JB/T 5838-1991 history
2013JB/T 8950.2-2013 Phase control thyristors.Part 2:Disc devices
1991JB/T 5838-1991 KP series 1000A and above case-rated reverse blocking triple pole thyristors
JB/T 5838-1991 KP series 1000A and above case-rated reverse blocking triple pole thyristors was changed to JB/T 8950.2-2013 Phase control thyristors.Part 2:Disc devices.