Electric fuse with indicating means

Details Electric fuse with indicating means Electric fuse with indicating means

1978-01-19

1979-05-22

Miller, J. D.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337241, H01H 8530

Patent

active

041562259

ABSTRACT:
An electric fuse is of the type including indicating means for indicating if the main fusible element has melted. The indicating means includes a first and second auxiliary fusible element, each having a higher resistance than the main fusible element. When the fuse is fully assembled, and the main fusible element has melted, the path of current is through the first and second auxiliary fusible elements. The second auxiliary fusible element functions to restrain movement of an indicator button. When current flows through the auxiliary fusible elements, the second auxiliary fusible element is designed to melt first, thereby causing the indicator button to move. The operability of the first and second auxiliary fusible elements can be independently and non-destructively determined before and after assembly of the fuse. After fuse assembly, the fuse can be non-destructively disassembled so as to determine the operability of the first and second auxiliary elements. Then, if the auxiliary elements are operable, the fuse can be simply reassembled.

REFERENCES:
patent: 2343224 (1944-02-01), Powell
patent: 2421658 (1947-03-01), Strang et al.
patent: 4060786 (1977-11-01), Cuzzone

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