Overcurrent protection using a new type of electric fuse

The electric fuses are one of the very well-known protection electrical apparatus which are used for domestic and especially in industrial applications. They have many advantages in comparison with other protection electrical apparatus as small overall dimensions, fast acting and small costs. Form protection point of view they isolate the load from the main source of power. Due to the fact that time of clearing fault current is the main parameter, in order to transform the time-current characteristic into an adjustable one, it has been developed the concept of controlled fusing. In this paper, the principle of controlled fusing applied to high breaking capacity fuses, is described. The protection of electronic devices, especially for power semiconductors, using the proposed controlled fuse, can be extended to other critical parameters from the protected electrical installation.