Delayed-fusion fuse
First Claim
1. A delayed-fusion fuse comprising:
- a fusible section having a narrow fusion portion made of electrically conductive metal;
a pair of electric connecting sections provided on both sides of said fusible section;
a metallic chip made of low fusing point metal for absorbing heat generated in said fusible section;
a covering and adhering section for holding said metallic chip; and
a thin metallic layer, disposed between a surface of said covering and adhering section made of said electrically conductive metal and a surface of said metallic chip, for increasing the energy of formation of a solid solution, said thin metallic layer including a nickel-plating layer having a thickness between 1 and 10 μ
m,wherein the energy of formation of a solid solution of said nickel-plating layer and said low fusing point metal of which said metallic chip is made is higher than the energy of formation of a solid solution of said low fusing point metal and said electrically conductive metal of which said fusible section is made.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention provides a delayed-fusion fuse by which its predetermined durability can be reliably ensured, and its stable pre-arcing time-current characteristics can be obtained, even when a current exceeding the steady-state current such as a motor lock current frequently flows in the fuse. The delayed-fusion fuse includes a pair of electric connecting sections formed on both sides of a fusible section having a narrow fusing portion made of an electrically conductive metal. Also, the delayed-fusion fuse includes a metallic chip made of low fusing point metal for absorbing heat generated in the fusible section, and a covering and adhering section for holding the metallic chip on the fusible section. A thin metallic layer forms a solid solution with the low fusing point metal, where the solid solution requires an energy of formation which is higher than that of the formation of a solid solution made of the electrically conductive metal and the low fusing point metal. This thin metallic layer is interposed between a surface of the covering and adhering section and a surface of the low fusing point metallic chip. Specifically, the thin metallic layer is provided on a surface of the fusible section in the form of a plating layer.
21 Citations
5 Claims
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1. A delayed-fusion fuse comprising:
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a fusible section having a narrow fusion portion made of electrically conductive metal; a pair of electric connecting sections provided on both sides of said fusible section; a metallic chip made of low fusing point metal for absorbing heat generated in said fusible section; a covering and adhering section for holding said metallic chip; and a thin metallic layer, disposed between a surface of said covering and adhering section made of said electrically conductive metal and a surface of said metallic chip, for increasing the energy of formation of a solid solution, said thin metallic layer including a nickel-plating layer having a thickness between 1 and 10 μ
m,wherein the energy of formation of a solid solution of said nickel-plating layer and said low fusing point metal of which said metallic chip is made is higher than the energy of formation of a solid solution of said low fusing point metal and said electrically conductive metal of which said fusible section is made. - View Dependent Claims (2, 3, 4, 5)
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Specification