Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Patent
1977-03-07
1978-06-06
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
337159, 337293, H01H 8504, H01H 8512
Patent
active
040939324
ABSTRACT:
In fuses for a sufficiently elevated circuit voltage the single breaks formed near the center of the fusible element at the occurrence of small overload currents does not produce a sufficiently high arc voltage to bring the current down to zero. In such instances it is necessary to produce series multibreaks to achieve interruption of the overloaded circuit.
The present invention describes new means to produce series multibreaks. In fuses according to this invention the fusible element is subdivided into a plurality of spaced elements in parallel to reduce the concentration of metal vapors. Each of the element forms a break near the center thereof. This occurs at different times t.sub.1, t.sub.2, t.sub.3, etc. even though the elements are identical. Each break-formation is accompanied by a concomitant increase of current in the remaining fusible elements, and each break-formation is accompanied by a concomitant voltage spike or voltage surge -- L(di/dt). These voltage surges are used to form series breaks in the fusible elements by spacing the constituent windings thereof so that a breakdown between windings may occur. The breakdown is, or may be said to be, a kind of Townsend discharge or spark rather than an arc discharge, i.e. a low current rather than a high current discharge.
REFERENCES:
patent: 3735317 (1973-05-01), Jacobs, Jr.
patent: 3810062 (1974-05-01), Kozacka
patent: 3843948 (1974-10-01), Kozacka
patent: 3881161 (1975-04-01), Kozacka
patent: 3969694 (1976-07-01), Kozacka
Broome Harold
Gould Inc.
Salzer Erwin
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