Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Patent
1994-08-25
1996-08-13
Picard, Leo P.
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
337166, 337152, 337160, 29623, H01H 8504, H01H 7120, H01H 6902
Patent
active
055460666
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.
REFERENCES:
patent: 2711464 (1955-06-01), Anderson
patent: 4464052 (1987-02-01), Matsunaga
patent: 4862134 (1989-08-01), Poerschke
patent: 4944084 (1990-07-01), Horibe et al.
patent: 5097247 (1992-03-01), Doerrwaechter
patent: 5159309 (1992-10-01), Bayer
patent: 5262751 (1993-11-01), Kudo et al.
patent: 5309625 (1994-03-01), Onishi
Hanazaki Hisashi
Kondo Hiroki
Kudo Toshiharu
Totsuka Mitsuhiko
Picard Leo P.
Ryan Stephen T.
Yazaki -Corporation
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