Current-limiting fuse with improved means for interrupting low overcurrents
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United States of America Patent
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-
Nov 9, 1982
Grant Date -
N/A
app pub date -
Jul 1, 1981
filing date -
Jul 1, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This current-limiting fuse comprises a fusible element having a predetermined location at which an arc will be initiated when prolonged overcurrents of relatively low value have persisted for a predetermined duration. For increasing the arc voltage developed by said arc, an electrical insulating member is disposed about the fusible element in a position where at least a portion of the arc will burn within the insulating member and cause vapors to be evolved from the material of the insulating member. The insulating member is of a material that evolves substantially no vapors or gases at the temperatures reached by the insulating material prior to arc-initiation during prolonged overcurrents of up to one hour in duration. This material is a baked material, a major portion of which is hydrated aluminum silicate including water of hydration that is released only at temperatures in excess of those attained by the insulating material during prolonged overcurrents as long as one hour.
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