This part is a kind of semiconductor called KBU1510.

Function of this product has 15 A Single-Phase Silicon Bridge Rectifier.

Manufacturers : SEP ELECTRONIC

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Some of the text within the PDF file :

SEP ELECTRONIC CORP. KBU15005 thru KBU1510 15 A Single-Phase Silicon Bridge Rectifier 3.85 + 0.25 23.2 + 0.5 4.4 + 0.2 1.95 + 0.25 6.8 + 0.2 Rectifier Reverse Voltage 50 to 1000V Features Ideal for P.C. Board mounting High surge current capability This series is UL listed under the Recognized Component Index, file number E142814 The plastic material used carries Underwriters Laboratory flammability recognition 94V-0 High temperature soldering guaranteed 265 C /10 seconds at 5 lbs (2.3kg) tension 17.3 + 0.5 19.3 MAX. _ 1.9 R. TYP . (2PLACES) ~ ~ + 10.8 + 0.5 4.9 + 0.2 25.4 MIN. Mechanical Data Case: Molded plastic body Terminals: Plated leads solderable per MIL-STD-202, Method 208 Polarity: Polarity symbols molded on body Mounting Position:: Any Mounting Torque: 5 in-lbs max. Weig [ ... ]

KBU1510 PDF Datasheet Download