This part is a kind of semiconductor called BTW69-200.

Function of this product has SCR.

Manufacturers : SGS-THOMSON

Image and pinout :

Some of the text within the PDF file :

BTW 69 (N) FEATURES HIGH SURGE CAPABILITY HIGH ON-STATE CURRENT HIGH STABILITY AND RELIABILITY BTW 69 Serie : INSULATED VOLTAGE = 2500V(RMS) (UL RECOGNIZED : E81734) SCR DESCRIPTION The BTW 69 (N) Family of Silicon Controlled Rectifiers uses a high performance glass passivated technology. This general purpose Family of Silicon Controlled Rectifiers is designed for power supplies up to 400Hz on resistive or inductive load. K A G TOP 3 (Plastic) ABSOLUTE RATINGS (limiting values) Symbol IT(RMS) IT(AV) ITSM I2t dI/dt Tstg Tj Tl Parameter RMS on-state current (180° conduction angle) BTW 69 Tc=70°C BTW 69 N Tc=75°C Average on-state current (180° BTW 69 Tc=70°C conduction angle,single phase circuit) BTW 69 N Tc=75°C Non repetitive surge peak on-state current ( Tj initial = 2 [ ... ]

BTW69-200 PDF Datasheet Download