This part is a kind of semiconductor called 6MBI15S-120L.
Function of this product has IGBT MODULE ( S-Series ).
Manufacturers : Fuji Electric
Image and pinout :

Some of the text within the PDF file :
6MBI 15S-120L IGBT MODULE ( S-Series ) n Features • NPT-Technologie • Solderable Package • Square SC SOA at 10 x IC • High Short Circuit Withstand-Capability • Small Temperature Dependence of the Turn-Off Switching Loss • Low Losses And Soft Switching 6-Pack IGBT 1200V 6x15A n Outline Drawing n Applications • High Power Switching • A.C. Motor Controls • D.C. Motor Controls • Uninterruptible Power Supply n Maximum Ratings and Characteristics • Absolute Maximum Ratings Items Collector-Emitter Voltage Gate -Emitter Voltage Collector Current (25°C / 80°C) Max. Power Dissipation Operating Temperature Storage Temperature Isolation Voltage Screw Torque ( Tc=25°C) Symbols VCES VGES Continuous IC 1ms IC PULSE Continuous -IC 1ms -IC PULSE PC Tj Tstg A.C. 1min. Vis Mounti [ ... ]
6MBI15S-120L PDF Datasheet Download
