Patent ID: 6954132
Filing Date: 2005-10-11
Classification: H01H

Abstract:
1. A pyrotechnic fuse element including: (a) a closed housing consisting of an electrically conductive material; (b) two terminal zones contained in the closed housing being electrically connected by means of the electrically conductive material of the closed housing; (c) an explosive material provided in the closed housing, the electric connection of the two terminal zones being separable by activating the explosive material, and the explosive material being made of a deflagrating pyrotechnic substance provided in such an amount and configured such that the electric connection of the two terminal zones of the closed housing is separated in a predetermined time in response to the deflagrating pyrotechnic substance being activated; (d) a circumferential weakening portion extending over the entire periphery of an outer wall of the closed housing and formed in the thickness of the outer wall, the circumferential weakening portion having a predetermined axial extension between two cross sectional steps, and the circumferential weakening portion being configured to break out entirely at least in a partial area of the circumferential weakening portion between two defined peripheral lines in response to the deflagrating pyrotechnic substance being activated; and (e) a protective housing surrounds the closed housing and at least one part of the closed housing being axially movably held in the protective housing on one side of the circumferential weakening portion, the at least one part of the closed housing preferably including stop means at the outer periphery thereof which limit the axial movement of the closed housing after the circumferential weakening portion has broken out, and holding means being preferably provided which fix the at least one part after the at least one part has moved axially.