TVR10K-E3/54 is an 800V diode from Vishay Semiconductor Diodes Division that has gone obsolete. 1N4947GP-E3/73GITB-ND from Vishay Semiconductor Diodes Division has been offered as a possible substitute. note* difference in speed replacement is faster.
To verify this part will work in your application or to view full specifications see the manufacturer datasheet
Please review the datasheets to ensure the alternative will work for your application.