Method for adjusting pre-arcing time-current characteristic of f

Details Method for adjusting pre-arcing time-current characteristic of f Method for adjusting pre-arcing time-current characteristic of f

1997-12-04

1999-06-29

Picard, Leo P.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337142, 337198, 337292, 337416, H01H 8504

Patent

active

059173998

ABSTRACT:
A method of adjusting pre-arcing time-current characteristic for a fuse is performed in a manner that a fusible portion I serving in a dead short-circuit area and a fusible portion II serving in a rare short-circuit area are coupled in series to form a fuse element, and entire pre-arcing time-current characteristic for the fuse is adjusted by combining pre-arcing time-current characteristic of the respective fusible portions I and II. A fuse structure is formed by a fusible portion I serving in a dead short-circuit, and a fusible portion II serving in a rare short-circuit area coupled in series with the fusible portion I serving in a dead short-circuit area. The fusible portion II serving in a rare short-circuit area is formed by material which is different in conductivity and melting point from those of material forming the fusible portion I serving in a dead short-circuit area.

REFERENCES:
patent: 4358747 (1982-11-01), Zlupko et al.
patent: 4626817 (1986-12-01), Cameron

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