Fanuc A50L-0001-0259 transistor module. These 300 amp transistors were manufactured by Fuji or Hitachi under licence for Fanuc.
Under the Fuji brand there were three series releases of the 0259 transistor; labelled as 0259/A being the earliest Fuji 2MBI300KB-060. Followed by the 0259/N which is both a Fuji 2MBI300ND-060-01 or the later Fuji 2MBI300NK-060-01. With the last released being the 2MBI300SK-060-01 labelled as a 0259#S.
Under the Hitachi licence model MBM300HS6A and later MBM300HS6G were labelled as 0259/N and the last was the MBM300HR6G being labelled as a 0259/S.
At DNC we have kept hold of thousands of old IGBT transistor modules which are fully functioning pulls; that we have kept hold off due to replacing with uprated transistor modules. The transistors are isolated gate bipolar transistors in the MBI package rated at 300 amp / 600 volt. If you require any contact us.