D0, D series D-fuse-links is proper to protect cables and electrical wires at rated voltage of 380V AC and 250V DC. The fusing -indicators, in several colors, allow to show both the rating and the fusion of the cartridge. A suitable gauge must be inserted in the base and the whole device is blocked by means of the screw cap. In this way, we have got a non-interechangeability of the fuse links with others of different currents.