Fuse with free standing helical fuse element and method of makin

Details Fuse with free standing helical fuse element and method of makin Fuse with free standing helical fuse element and method of makin

1978-06-22

1979-06-12

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337295, 29623, H01H 8504

Patent

active

041581881

ABSTRACT:
A high voltage combination fuse has a current limiting section which has a free standing, helical coil of fusible wire material. The support for the free standing coil comes only from the pulverulent arc quenching material which fills the fuse casing and surrounds the coil. The coil has a foot portion and a head portion of increased cross-section to avoid arcing in the immediate vicinity of the end caps. The foot and head portions are preferably formed by doubling back a length of wire at the respective end and wrapping the tip of the doubled back length around the wire.

REFERENCES:
patent: 3287524 (1966-11-01), Huber et al.
patent: 3740687 (1973-06-01), Cameron
patent: 4028655 (1977-06-01), Koch

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