The D fuse system is the first generation of screw fuse systems in the German DIN standard. It is still used in many installations. This D system includes the sizes DII, DIII, DIV, DV. The D0 fuse system is the most modern screw system in the German DIN standard. This system includes the sizes D01, D02 and D03. These ultra-fast acting D & D0 ranges gR are dedicated to semiconductor protection in applications where fuse links are accessible to and can also be changed by untrained persons. They are used to protect components such as diodes, thyristors or AC / DC motor drives. The R stands for the English word Rectifier. D & D0 fuse links are available in the rated current range from 2A to 200A. IEC 60 269-4, DIN EN 60269-4 (VDE 0636-4), DIN VDE 0636-3