This part is a kind of semiconductor called SKM400GB128D.

Function of this product has SPT IGBT Module.

Manufacturers : Semikron International

Image and pinout :

Some of the text within the PDF file :

SKM 400GB128D... Absolute Maximum Ratings Symbol Conditions IGBT  % %56 7  9" 1 3     )- 12*3 .   /  :5&%:; <   &" /  =   )- 12*3 .   /    /*  B  =B 9  /-* .   )- 12*3 .   /    /*  B  B 9  /-* .   )- ."      ' Values /)** -#- 14**3 #** 8 )*  4* === > /-* 1/)-3 4*** @A* 1)#*3 #** )A** @A* 1)#*3 #** )A** Units  & &  .  & & & & & & SEMITRANSTM 3 SPT IGBT Module SKM 400GB128D SKM 400GAL128D SKM 400GAR128D Inverse diode %? %?56 %? 6 %? %?56 %? 6 Freewheeling diode Characteristics Symbol Conditions IGBT 713 % 1:3  1 3    D 5E>E '1 3  '13   13 7  " %  /) & 7  *"    " 9  )- 13 . 9  )- 13 . 7  /- " 9  )- 1/)-3 [ ... ]

SKM400GB128D PDF Datasheet Download