This part is a kind of semiconductor called BTA16-600B.

Function of this product has TRIAC.

Manufacturers : Comset Semiconductors

Image and pinout :

Some of the text within the PDF file :

SEMICONDUCTORS BTA16 Series TRIAC FEATURE Glass passivated triacs in a plastic TO220 package. The bta16 series is suitable for general purpose AC switching. They can be used as an ON/OFF function in applications such as static relays,heating regulation, induction motor starting circuits... or for phaseoperation in light dimmers, motorspeed controllers,... Compliance to RoHS. A2 A1 G ABSOLUTE MAXIMUM RATINGS http://www.DataSheet4U.net/ Symbol Ratings BTA16-600B Value BTA16-800B 800 800 16 160 -45 to +150 110 Unit VDRM VRRM IT(RMS) ITSM Tstg Tj Repetitive peak off-state voltage Repetitive peak reverse voltage RMS on-state current Non-repetitive peak on-state current Storage temperature range Operating junction temperature 600 600 V A A °C °C THERMAL CHARACTERISTICS Symbol R [ ... ]

BTA16-600B PDF Datasheet Download