The Semikron SKVC 20A 251 is an ultra-fast rectifier diode module designed for use in high-power switching applications. It features a voltage rating of 200V and a current rating of up to 20A. This diode module is designed to provide very fast switching times, making it ideal for use in high-speed motor drives, power supplies, and uninterruptible power supplies. It also features low forward and reverse recovery times, allowing for smooth and efficient operation.