This part is a kind of semiconductor called HVR-1X-30B.

Function of this product has High Voltage Power Diodes Standard and Ultra Fast Recovery.

Manufacturers : HV Component Associates

Image and pinout :

Some of the text within the PDF file :

HVR, UX, 2CL2–POWER DIODES, AXIAL LEADS HIGH VOLTAGE POWER DIODES STANDARD AND ULTRA-FAST RECOVERY 0.87 Min 22 0.87 Min 22 0.87 Min 22 0.28±.02 7±0.5 Inches MM 0.047 1.2 Repetitive Avg. Forward Peak Reverse Current Max. HVCA VRRM IFAVM@55°C mA Number V(Volts) (milliAmps) UX–Fast Recovery 50 nsec High Current Diode UX-FOB 8000 500 HVR-1X–Standard Recovery High Current Diodes HVR-1X-40A 10000 HVR-1X-30B 12000 500 500 Max. Forward Voltage Drop VF@IF V(Volts) 14.0 10.0 11.0 Max. Reverse Current IR@VRRM@25°C mA (microAmps) 0.5 0.3 0.3 Max. Surge Current IFSM (8.3ms) A (Amps) 20 30 30 MEDIUM POWER HIGH VOLTAGE SILICON DIODES ‘C’ dia Cathode Band 2 ‘D’ dia Dimension Details A B Maximum Inch mm Minimum Inch mm Minimum C Maximum mm Inch mm Inch Inch Maximum mm ‘B [ ... ]

HVR-1X-30B PDF Datasheet Download