Composite dropout fuse device

Details Composite dropout fuse device Composite dropout fuse device

1975-11-19

1977-03-08

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337186, H01H 7120

Patent

active

040115372

ABSTRACT:
A dropout type fuse cutout is provided having a high current limiting fuse section and a serially connected expulsion fuse section mounted on a conventional dropout toggle linkage arrangement so that fuse action by the expulsion fuse section causes the cutout to dropout and pivot free of the upper terminal. The current limiting fuse section may comprise a helically edge wound fusible member that reduces the terminal-to-terminal distance thereby reducing the length of the current limiting fuse section so that there is a very short external gap. Further, because of the sequential occurence of maximum voltage across the current limiting fuse section and the expulsion fuse section, each section experiences a unique voltage distribution that requires the utilization of insulating skirts on both fuse sections to maintain the external voltage withstand capabilities of the device even though the device is of sufficient overall length to be expected to provide an adequate dielectric path when contaminated or under wet conditions.

REFERENCES:
patent: 2067541 (1937-01-01), Nobuhara
patent: 3611240 (1971-10-01), Mikulecky

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