Composite dropout fuse device

Details Composite dropout fuse device Composite dropout fuse device

H - Electricity

01

H

306/123

H01H 85/042 (2006.01) H01H 71/20 (2006.01) H01H 31/12 (2006.01)

Patent

CA 1042491

COMPOSITE DROPOUT FUSE DEVICE 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 arrange- ment 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 occurrence 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.

254613

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