Fusible element for electric fuses based on a M-effect

A ribbon-type fusible element for electric fuses including a base metal having a relatively high fusing point and an overlay metal having a relatively low fusing point and capable of severing the current path through said base metal comprising in combination

• (a) a base metal having a front side and a rear side and having an elongated substantially rectangular relatively long perforation extending substantially in a transverse direction of said base metal;
• (b) said base metal further having a pair of substantially rectangular relatively short perforations each to opposite sides of said relatively long perforation, said relatively short perforations being open along the lateral edges of said base metal;
• (c) said relatively long perforation and said relatively short perforations defining a pair of parallel current paths therebetween;
• (d) a first overlay metal arranged on said front side of said base metal extending across the entire width thereof and arranged in spaced relation from said pair of parallel current paths;
• (e) a second overlay metal arranged on said rear side of said base metal extending across the entire width thereof and arranged in spaced relation from said pair of parallel current paths;
• whereby
• (f) upon fusion of said first overlay metal and upon fusion of said second overlay metal two oppositely directed metal jets flow to said pair of parallel current paths and sever said base metal at said points of parallel current paths.