Current limiting fuse

Details Current limiting fuse Current limiting fuse

1981-05-15

1983-06-14

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337162, H01H 8504

Patent

active

043886035

ABSTRACT:
A current limiting fuse has a main fusible element and an auxiliary fusible element each helically wound over an insulative support member. Each end of the auxiliary element is connected to conductive metal clips or electrodes in which blocks of metal oxide varistor material are fixedly secured and placed in contact with the main fusible element. Subsequent to the initial burn back of the main fusible element, the metal oxide varistors precisely initiate electrical arcs between the terminal clips at the ends of the auxiliary fusible element and the main element at points adjacent to these terminal clips. The presence of these arcs quickly sever the main element or elements at these points thereby producing additional burnback areas in the main fusible element or elements.

REFERENCES:
patent: 3243552 (1966-03-01), Mikulecky
patent: 3813627 (1974-05-01), Koch
patent: 3978443 (1976-08-01), Dennis et al.
patent: 4028655 (1977-06-01), Koch

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