A GFCI (Ground Fault Current Transformer) switch is a device used for electrical safety protection, primarily to prevent electric shock and electrical fires. The GFCI switch has a highly sensitive current detection function. Once leakage or ground fault is detected in the circuit, the power supply can be quickly cut off, effectively preventing electric shock accidents. In addition, GFCI switches are also waterproof and moisture-proof, and are suitable for use in humid environments such as bathrooms and kitchens, providing users with a safer and more reliable electrical environment. GFCI switches are usually designed to be easy to install and operate, allowing users to easily monitor and reset the switch status. In general, the GFCI switch is an important electrical safety device that can effectively protect users from electric shock and electrical fires. It is an essential safety device in modern homes and commercial places.