Electric fuse capable of interrupting small overload currents by

Details Electric fuse capable of interrupting small overload currents by Electric fuse capable of interrupting small overload currents by

1976-10-19

1977-10-18

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337293, 337296, H01H 8512

Patent

active

040548589

ABSTRACT:
The fusible element of a fuse that needs series multibreaks for interrupting small currents is provided with a shunt current path including an arc gap in the center region thereof. That current path does not normally carry any current on account of the presence of the arc gap in it. The shunt current path shunts a portion of the fusible element including a so-called M-effect causing overlay. When that overlay becomes operative it causes formation of an arc gap in the fusible element which, in turn, causes a voltage to appear across the arc gap. When that voltage is sufficiently high the arc gap breaks down. The ensuing arc current is too small to allow formation of series breaks in the fusible element. The fusible element or the above shunt thereof are provided with beads that evolve gases under the action of the arc. These gases are directed to the points of junction of the fusible element and its shunt and due to this artificial gap contamination by hot gases the arc current becomes sufficiently high to produce series breaks in the fusible element.

REFERENCES:
patent: 3341674 (1967-09-01), Jacobs, Jr.
patent: 3705373 (1972-12-01), Cameron
patent: 3810062 (1974-05-01), Kozacka
patent: 3864655 (1975-02-01), Kozacka
patent: 3969694 (1976-07-01), Kozacka

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