This part is a kind of semiconductor called D75E60.

Function of this product has Fast Switching Emitter Controlled Diode.

Manufacturers : Infineon

Image and pinout :

Some of the text within the PDF file :

IDW75E60 Fast Switching Emitter Controlled Diode Features:  600V EmCon technology  Fast recovery  Soft switching  Low reverse recovery charge  Low forward voltage  175°C junction operating temperature  Easy paralleling  Pb-free lead plating; RoHS compliant  Complete product spectrum and PSpice Models: http://www.infineon.com/emcon/ Applications:  Welding  Motor drives PG-TO247-3 Type IDW75E60 VRRM 600V IF 75A VF,Tj=25°C 1.65V Tj,max 175C Marking D75E60 Package PG-TO247-3 Maximum Ratings Parameter Repetitive peak reverse voltage Continuous forward current TC = 25C TC = 90C TC = 100C Surge non repetitive forward current TC = 25C, tp = 10 ms, sine halfwave Maximum repetitive forward current TC = 25C, tp limited by tj,max, D = 0.5 [ ... ]

D75E60 PDF Datasheet Download