The B72220U2551K502 electronic part by TDK is a varistor through hole RoHS compliant component. It is a non-linear, two-terminal, electro-mechanical component constructed from ceramic materials. This varistor has a 5.2kV AC nominal voltage rating and is designed to protect against transient current surges. It features high insulation resistance and low leakage current, making it suitable for a wide variety of applications. Additionally, this part is RoHS compliant, meaning it has been tested for the presence of hazardous substances and meets safety and environmental regulations. This part is ideal for circuit protection and surge protection applications.