The Eaton Bussmann ANN Fuses are fast-acting, indicating forklift fuses that open within seconds of being exposed to overloads and short circuits. Also called "fast-blow forklift fuses", these series fuses are highly sensitive to changes to current flow and don't tolerate temporary overload currents or power surges. With their see-through view window, it's quick and easy to see if the fuse wire is intact or has melted (blown).