Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Patent
1976-09-14
1978-02-14
Harris, George
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
337280, H01H 8518
Patent
active
040742202
ABSTRACT:
A fusible device is provided, of the generally-enclosed type, having an improved granular filler material surrounding, or encompassing the one or more fuse links. Preferably, the granular filler material comprises sand and alumina trihydrate (Al.sub.2 O.sub.3.3H.sub.2 O). Another filler material, which gives roughly half the improvement of the aluminum trihydrate, is aluminum monohydrate (Al.sub.2 O.sub.3.H.sub.2 O) in varying proportions.
Of less satisfactory performance, as admixed with the sand, was hydrous alumina silicate (Al.sub.2 O.sub.3.SiO.sub.2.XH.sub.2 O) (unfired lava), and of still less satisfactory performance, is a slight amount of free water physically admixed with sand, although its physical location within the sand is questionable, and such a fuse is of low interrupting reliability.
REFERENCES:
patent: 1157919 (1915-10-01), Arsem
patent: 1959770 (1934-05-01), Slepian
patent: 3227844 (1966-01-01), Burrage et al.
Inorganic Chemistry, Jones, 1947, pp. 259-261.
Crout W. R.
Harris George
Westinghouse Electric Corporation
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