The RX0405K with Thyristors - TRIACs is a one-way thyristor designed to protect electrical circuits from voltage and current surges. It is a 600V thyristor with a TO-252-2 (DPAK) package and is RoHS compliant. This thyristor is manufactured by Haoruijia, an experienced semiconductor company known for producing high-quality components with advanced reliability and stability. The RX0405K Thyristor can be used for a variety of applications such as controlling the speed of fans, light dimmers, variacs, power supplies, motor drives, and many more. This particular thyristor offers a great combination of speed and control for your applications needs.