Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Patent
1980-09-19
1981-12-22
Harris, George
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
337273, H01H 8538
Patent
active
043073697
ABSTRACT:
An improved fuse tube for a high voltage fuse contact used to interrupt low and high fault currents. The fuse tube has an arc-extinguishing bore into which a fuse link is insertable. The fuse link includes an arc-extinguishing sheath surrounding a pair of separable terminals and a fusible element normally between the terminals. An arc established and elongated between the separating terminals after the fusible element melts and decomposes the bore, the sheath, or both to rapidly evolve large amounts of arc-extinguishing gases which are exhausted from an open end of the bore. A conductive chamber in the bore is electrically connected with one of the terminals and surrounds a portion of the sheath and the terminals. A mild taper is formed in the bore so that its larger end is at the open bore end. The chamber permits the fuse link to be positioned deep within the bore so that low fuse current interruption is not compromised. During high fault current interruption, the arc transfers from one of the terminals to the chamber, thus limiting the extent at which the arc can be elongated. This function of the chamber in combination with the mild taper results in efficient high fault current interruption.
REFERENCES:
patent: 2567236 (1951-09-01), Rawlins et al.
patent: 2878341 (1959-03-01), Lange
patent: 3513437 (1970-05-01), McMorres
Harris George
Kaufmann John D.
S&C Electric Company
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