This part is a kind of semiconductor called KBP307.

Function of this product has 3.0A Single-Phase Silicon Bridge Rectifier.

Manufacturers : SEP ELECTRONIC

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Some of the text within the PDF file :

SEP ELECTRONIC CORP. KBP301 thru KBP307 3.0 A Single-Phase Silicon Bridge Rectifier Rectifier Reverse Voltage 50 to 1000V 14.7+ 0.5 Features This series is UL listed under the Recognized Component Index, file number E142814 Ideal for printed circuit board mounting The plastic material used carries Underwriters Laboratory flammability recognition 94V-0 Built-in printed circuit board stand-offs High case dielectric strength High temperature soldering guaranteed 265 /10 seconds at 5 lbs (2.3kg) tension Mechanical Data Case: Reliable low cost construction utilizing molded plastic technique Terminals: Plated leads solderable per MIL-STD-202, Method 208 Mounting Position: Any Weight: 0.065 ounce, 2.2 grams (approx) 12.2+ 0.5 15.2 MIN. 12.7 MIN. 2.41+ 0.25 3.85+0.25 0.81+ 0.05 1.5 + 0.2 [ ... ]

KBP307 PDF Datasheet Download