From the ManufacturerMersen A2D10R 250V 10A Rk1 Time Delay Fuse, UL Power Fuse, Class Rk1, Time Delay Characteristics, 250 Vac, 10 Ampere, Interrupting Rating 200 Kiloampere, Ferrule Terminal, Diameter 9/16 Inch, Length 2 Inch, Approval Ul 248-12, Csa C22.2, Amp-Trap 2000[R] Brand, A2D Model, Current Limiting, Fiberglass Tube