Wickmann-werke Gmbh

André Jöllenbeck

Andreas Baus

Uwe Röder

Frank Althoff

Klaus Stark

Karin Koch

Peter Pössnicker

Ute Lehnhardt

Ludger Richter

Werner Barz

A fuse component includes an electrically insulating substrate having a top surface, a thick film fuse element applied to the top surface and a cover layer. The cover layer is made of an electrically insulating material having good caloric conductivity. The cover layer can be directly applied to the thick film fuse element and the adjoining zones of the top surface of the substrate. The cover layer can contain a glass having a specific caloric conductivity of &#x3e;2 W/mK. The cover layer can have a window disposed above a section of the fuse element, the section of the fuse element located within the window being at least partially covered by a solder containing layer.

Fuse component

A fuse component () includes a hollow body () which is formed from a tubular wall that encloses an inner area () and which has two open faces that are situated opposite one another. The fuse component also includes a fuse-element () which extends inside the inner area () between both faces of the hollow body () and two contact caps () each provided with a bottom () and lateral walls () connected thereto. Two end section () of a conductor of the fuse-element () are led out of the inner area () through the faces and around the wall of the hollow body (). The end sections () of the conductor of the fuse element () are fastened by an adhesive bond () so that the surfaces abutting the inner area () are essentially free from organic materials. The end sections () of the conductor are preferably fastened to a conductive plastic that, in turn, fastens the contact caps () to the outer wall () of the hollow body ().

A fuse component () has a fusible conductor () which extends in a gas filled cavity () within a cylindrical tube () between two end surfaces (). Two end caps () of an electrically conductive material are applied to the ends of the tube () so that an electrical contact is produced with the fusible conductor (). At at least one of the two ends of the tube (), a sealing body of a plastic material, which is predominantly elastically compressible but at the same time capable of creep, is introduced into a gap between the base of the end cap and the end surface () of the tube () and into a portion of the cavity adjacent to the cap base. The sealing body has been compressed between the end surface () and the cap base during the manufacture of the fuse component () when positioning the end cap (). The compressed sealing body () attempts to expand again, whereby it expands principally into the cavity (). If a sudden pressure rise occurs in the cavity shortly after its introduction during the manufacturing process as a result of a temperature increase, it can occur that this overpressure balances out into the external surroundings via a temporarily formed passage between the tube, the sealing body and the end cap. The passage which is formed is then sealed again as a result of the ability of the plastic material to creep.

Tubular fuse component with end caps with a hermetically sealing plastic sealing body insert

A fuse element includes a fusible conductor which extends within a gas filled cavity in a cylindrical tube. The fuse element includes a cylindrical tube comprising, an electrical insulator between two end faces of the tube, two end caps of an electrically conductive material being applied to the two ends of the tube such that an electrical contact is produced with the fusible conductor. At least one respective sealing element is inserted in at least one of the two ends in a space between the cap base and the end face of the tube and/or into a portion of the cavity of the tube adjacent to the end face such that one or more pressure balancing passages remain between the gas filled cavity within the tube and the external surroundings of the fuse element. The one or more pressure balancing passages are of such small cross-section that changes in pressure in the cavity are balanced only very slowly. A sudden increase in pressure in the cavity, such as occurs as a result of an arc, which is produced when the fusible conductor ruptures, can act to quench the arc.

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Bochum, Germany

André Jöllenbeck