High speed ratio, dual fuse link

Details High speed ratio, dual fuse link High speed ratio, dual fuse link

1977-06-21

1978-10-17

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337217, 337292, H01H 7110, Ho1H 7120

Patent

active

041211871

ABSTRACT:
A relatively low cost dual element fuse link including a meltable solder junction has a pair of thermally insulated, serpentine, fusible elements supported on opposite sides of the junction for increasing the heat transferred to the junction by the elements in response to a given current carried by the link such that the junction will be caused to melt at lower current values thereby providing the link with an increased speed ratio. A pair of cylindrical porcelain insulators disposed along respective serpentine elements present the desired thermal insulation as well as provide structural stability to the elements precluding deformation of their serpentine shape when the fuse link is under tension as in a distribution system cutout. The serpentine shape of the elements presents an increased element length which in turn reduces the temperature gradient along the elements thereby reducing axial conductive heat loss from the ends of the elements remote from the solder junction.

REFERENCES:
patent: 1740699 (1929-12-01), Murray
patent: 2416428 (1947-02-01), Boothe
patent: 2493601 (1950-01-01), Smith, Jr.
patent: 2750470 (1956-06-01), McBride

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