Classification of relevant parameters (Time/Current-Characteristic; Integrals; Operating Times etc.) of two or more overload protection devices to each other. In case of overloads only the protection device should react. Fuses with the same characteristic are mostly selective to each other, if they are selected in the proportion 1:1,6. That means, that a fuse with a rated current of 100 A should be downstream of a fuse rated 160 A. For the short-circuit range the comparison of the melting integrals versus the Operating integral of the downstream fuse is important.