The KL-225/50,8/SW/V/I with Heatsink is a power transistor module manufactured by Seifert. It has an extruded heatsink, a compact, robust, sealed construction, and is U-shaped. It is suitable for use with various packages, including SOT32, SOT93, TO126, TO218, TO220, TO247, and TOP3. The module is intended for power switching applications with medium power dissipation, and has excellent thermal performance. It supports both forward and reverse power flow, and is suitable for many types of medium power applications.