This is a bridge rectifier,  GBPC15 Series with 4 pins and a case packaging. 

The unit has a maximum continuous current of 15A, a peak forward voltage of 1.1V, and a peak reverse repetitive voltage of 50V. Additionally, it has a maximum gate trigger voltage of 50V and a peak surge current of 300A. 

This unit is suitable for Business, Office & Industrial, Electrical Equipment & Supplies, Electronic Components & Semiconductors, Semiconductors & Actives, and Diodes & Rectifiers categories.

Please let us know if you need more information.