This is the Infineon TT162N12KOF Thyristor. It is a very powerful and reliable device, designed for high power applications. The thyristor has an off-state voltage rating, or Urmax, of 1.2kV, which allows for higher current operation. The continuous forward current rating, or If, is rated at 260A, and the gate trigger current, or Igt, is rated at 150mA. The package type is BG-PB34-1.