H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/144
H01H 85/06 (2006.01) H01H 85/055 (2006.01)
Patent
CA 1111881
ELECTRIC FUSE HAVING FOLDED FUSIBLE ELEMENT AND HEAT DAMS Abstract of Disclosure A fusible element for electric fuses combining the ability of interrupting with a time-lag currents in the overload range with the ability of interrupting with a current-limiting action currents in the range of short-circuit currents. The fusible element comprises a relatively wide perforated center section and axially outer heat-dam-strip sections of relatively uniform cross- section. The center section has points of reduced cross-section imparting to it a predetermined fusing i2.t. The center section of the fusible element is folded in a direction longitudinally thereof to effect mutual heating of the portion, or portions, thereof to different sides of the fold, or folds. This allows to increase the mass of the center section and results in an in- crease of time-lag. The relatively wide center section is further provided with an overlay of a metal having a fusing point lower than the fusing point of the metal of which the center section consists to sever the center section on occurrence of currents in the overload range. Relatively narrow heat-dam-strip sections extend from the ends of the center section to the termi- nals of the fuse. The fusing i2.t of the heat-dam-strip sections is larger than that of the center section to avoid fusion of the heat-dam-strip sections prior to that of the center section, or to entirely preclude fusion of said heat-dam-strip sections. The heat-dam-strip sections are folded in transverse direction preferably a number of times which increases their length for given casing dimensions, and consequently their resistance to axially outward heat flow from the center section, thereby en- hancing the same effect that results from the reduced width of the heat-dam-strip sections relative to the width of the center section. The points of reduced cross-section of the center section are of a metal having a relatively low fusing i2.t, in particular silver, to minimize its fusing i2.t. The heat-dam-strip sections are of a metal other than silver in the interest of greater economy and greater flexibility. Electroconductive bonds con- nect the center section to the heat-dam-strip sections.
328720
Gould Electronics Inc.
Sherman
LandOfFree
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