Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Shunt or short circuit completion devices
Patent
1983-02-22
1984-05-29
Beha, Jr., William H.
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Shunt or short circuit completion devices
200144B, H01H 8538
Patent
active
044518137
ABSTRACT:
A vacuum fuse includes a pair of metallic spiral elements of different wrapping directions mounted on inner end portions of axially aligned conductor rods. The radial inner ends of spiral elements are electrically connected to respective conductor rods and the radial outer ends are electrically connected to outer metallic rings, respectively. Arcing electrode disks are mounted to opposite axial ends of the outer rings to define confronting spaced apart and parallel arcing surfaces. A fusible element is connected between the conductor rods. When the fusible element is broken by an excess current, an arc is produced between the arcing surfaces and a magnetic flux is induced by the current flowing through the spiral elements. The magnetic flux causes the arc to move so that each arcing electrode is prevented from being locally heated, thereby improving the current interrupting property of the fuse.
REFERENCES:
patent: 2949520 (1960-08-01), Schneider
patent: 3283103 (1966-11-01), Greenwood et al.
patent: 3587024 (1971-06-01), Cutris
patent: 3683139 (1972-08-01), Ludwig
patent: 3818164 (1974-06-01), Mizutani et al.
patent: 3913047 (1975-10-01), Arthur
patent: 4109123 (1978-08-01), Lipperts
Hirose Kengo
Kudo Norio
Beha Jr. William H.
Japan Radio Company, Ltd.
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