Current limiting fuse with improved low current clearing capabil

Details Current limiting fuse with improved low current clearing capabil Current limiting fuse with improved low current clearing capabil

1978-02-09

1980-02-19

Moses, R. L.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337161, H01H 8504

Patent

active

041896947

ABSTRACT:
This concerns a fuse of the type having a central mandrel or fuse spider around which is wound one or more fuse elements. At least one longitudinal strut of the mandrel is disposed to be freely rotated about its axis within limits during a fusing operation. Ideally, spaced struts are disposed to rotate in opposite directions about their axes. The aforementioned fuse element is fixedly secured to the struts so that the opposite rotational movement will strain each fuse element after a fusing operation has begun, thus mechanically breaking those fuse elements in several places to enhance the low current clearing capability of the fuse. An appropriate device for causing the rotation is provided. The device may be driven by an electrically actuated, highly controlled explosive charge which moves a plunger which in turn actuates interlinked levers, thus causing the desired rotation. The foregoing fuse is especially helpful in current limiting operations for high voltage, low current situations.

REFERENCES:
patent: 2294767 (1942-09-01), Williams
patent: 3243552 (1966-03-01), Mikulecky
patent: 3287525 (1966-11-01), Mikulecky
patent: 3304389 (1967-02-01), Lindell

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