This part is a kind of semiconductor called MDA1000.

Function of this product has Diode Modules.

Manufacturers : TECHSEM

Image and pinout :

Some of the text within the PDF file :

TECHSEM Features： n Isolated mounting base 2500V~ n Pressure contact technology with Increased power cycling capability n Space and weight savings Typical Applications n AC/DC Motor drives n Various rectifiers n DC supply for PWM inverter MDC1000 MDA1000 MDK1000 MD1000 Diode Modules IF(AV) VRRM IFSM I2t 1000A 600~1800V 18A×103 1650A2 S*103 SYMBOL CHARACTERISTIC IF(AV) IF (RMS) VRRM Mean forward current RMS forward current Repetitive peak reverse voltage IRRM IFSM I2t VFO rF VFM Rth(j-c) Rth(c-h) Viso Fm Tstg Wt Outline Repetitive peak current Surge forward current I2T for fusing coordination Threshold voltage Forward slop resistance Peak forward voltage Thermal resistance Junction to case Thermal resistance case to heat sink Isolation voltage Terminal connection torque (M12) M [ ... ]

MDA1000 PDF Datasheet Download