Patent ID: 7119651
Filing Date: 2006-10-10
Classification: H01H

Abstract:
1. A fuse state indicator for a fuse including a cylindrical fuse body and a primary fuse element therein, said fuse state indicator comprising: an extension member having an outer surface the outer surface having a curvature complementary to a curvature of the cylindrical fuse body; a transparent lens coupled to said extension member; a readily combustible substance adjacent the lens; a secondary fuse link adjacent said combustible substance, said readily combustible substance substantially completely ignited and consumed when said secondary fuse link opens; and a curved backing layer adjacent said secondary fuse link, the backing layer having a major surface and a minor surface peripheral to the major surface, the major surface having a curvature complementary to the curvature of the extension member, said backing layer at least partially concealed by said combustible substance when viewed through said transparent lens before the fuse has opened, said backing layer maintaining said secondary fuse link in position with respect to said combustible substance.