This part is a kind of semiconductor called GUR460.

Function of this product has (GUR440 / GUR460) Ultrafast Plastic Rectifier.

Manufacturers : General Semiconductor

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Some of the text within the PDF file :

GUR440 and GUR460 Ultrafast Plastic Rectifier DO-201AD Reverse Voltage 400 to 600V Forward Current 4.0A Features 1.0 (25.4) MIN. New ct u d Pro 0.210 (5.3) 0.190 (4.8) DIA. 0.375 (9.5) 0.285 (7.2) • Plastic package has Underwriters Laboratories Flammability Classification 94V-0 • Ideally suited for use in very high frequency switching power supplies, inverters and as free wheeling diodes • Ultrafast recovery time for high efficiency • Excellent high temperature switching • Glass passivated junction • High temperature soldering guaranteed: 250°C/10 seconds, 0.375" (9.5mm) lead length, 5 lbs. (2.3kg) tension Mechanical Data 0.052 (1.32) 0.048 (1.22) DIA. 1.0 (25.4) MIN. Dimensions in inches and (millimeters) Case: JEDEC DO-201AD molded plastic body o [ ... ]

GUR460 PDF Datasheet Download