Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Patent
1978-05-09
1980-05-20
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
337159, H01H 8508
Patent
active
042041830
ABSTRACT:
An electrical fuse is taught having a ribbon-like fuse element therein. The fuse element has a generally uniform width along its length, but the depth of the fuse element is tapered in some regions. Holes or openings of various shapes are disposed along the length of the fuse through the depth thereof. The holes may be circular, triangular, or rectangular in shape and may be through a central portion of the fuse element or may comprise notches at the edges of the fuse element or both. The depth of the fuse element may increase with longitudinal distance from a relatively thin central portion of the fuse element to relatively thick end portion thereof, or vice versa. During low current clearing, the relatively thin portion will melt first and then burns back along the tapered portions until the fault current is extinguished. During high current interruption the fuse element will melt first at the notches located on the thin portion of the element and then progressively at the notches along the tapered portion of the element. Multiple arclets are thus formed in series which merge towards each other with time. Each arclet provides a component voltage for a composite arc voltage which limits current.
REFERENCES:
patent: 2157906 (1939-05-01), Lohausen
patent: 2157907 (1939-05-01), Lohausen
patent: 3138682 (1964-06-01), Dannenberg et al.
patent: 3909766 (1975-09-01), Cameron et al.
Broome Harold
Moran M. J.
Westinghouse Electric Corp.
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