Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Patent
1977-04-15
1978-09-26
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
337159, H01H 8508
Patent
active
041174410
ABSTRACT:
A current limiting fuse is characterized by a self-standing tubular fuse element having a high surface area-to-volume ratio to augment cooling and thus increase the steady-state current rating of the fuse and also having a plurality of axially spaced, generally diamond-shaped perforations each of which extends circumferentially somewhat less than 360.degree., with axially successive perforations displaced 180.degree. apart in a circumferential direction, thereby forming a plurality of axially spaced, ring-shaped portions providing parallel arcuate current paths and with axially extending interconnections between successive pairs of ring-shaped portions disposed on diametrically opposed sides of said tubular element to thereby further increase the length of current path through said fuse element and develop a high arc voltage.
REFERENCES:
patent: 2337938 (1943-12-01), Serfling et al.
Broome Harold
Electric Power Research Institute Inc.
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