This part is a kind of semiconductor called BTB16.

Function of this product has Triac.

Manufacturers : BLUE ROCKET ELECTRONICS

Image and pinout :

Some of the text within the PDF file :

BTB16 Rev.E Mar.-2016 DATA SHEET 描述 / Descriptions TO-220 塑封封装 双向可控硅。Triac in a TO-220 Plastic Package.  特征 / Features 中电流可控硅，高转换性能，低通态压降，高可靠性和稳定性，热敏电阻特性低，低热阻绝缘陶瓷片， 绝缘 BTA。 Medium current triac, High commutation performances,Low on state voltage drop,High reliability and stability,Low thermal resistance, Low thermal resistance insulation ceramic,insulated BTA. 用途 / Applications 主要应用于开关电路，如固态继电器、温控器、马达驱动和马达调速控制、相位控制调光器等。 They can be used as an ON/OFF function in applications such as static relays,heating regulation, induction motor starting circuits or phase control operatio [ ... ]

BTB16 PDF Datasheet Download