This part is a kind of semiconductor called CR3CM.

Function of this product has Lead-Mount / Phase Control SCR.

Manufacturers : Powerex

Image and pinout :

Some of the text within the PDF file :

CR3CM Powerex, Inc., 200 Hillis Street, Youngwood, Pennsylvania 15697-1800 (412) 925-7272 Lead-mount, Phase Control SCR 3 Amperes/400-600 Volts OUTLINE DRAWING P H - DIA. C G  A D M N N F B Description: The Powerex CR3CM Lead-mount Phase Control SCRs are glasspassivated thyristors for use in low power control and rectification. These devices are molded silicone plastic types. Features: □ Glass Passivated Applications: □ Static Switch □ Motor Control □ Strobe Flasher Ordering Information: Example: Select the complete six or seven digit part number you desire from the table - i.e. CR3CM-8 is a 400 Volt, 3 Ampere Phase Control SCR. Type CR3CM Dimensions H J K L M N P Inches Millimeters VDRM/VRRM Volts 400 600 Dimensions A B C D E F G Inches 0.93 ± 0.02 0.47 Min. 0.39 Max. 0.31 [ ... ]

CR3CM PDF Datasheet Download