Fuse element with a temporary quasi-hermetic seal of its...

Details Fuse element with a temporary quasi-hermetic seal of its... Fuse element with a temporary quasi-hermetic seal of its...

2006-11-21

2006-11-21

Vortman, Anatoly (Department: 2835)

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

C337S273000, C337S250000

Reexamination Certificate

active

07138899

ABSTRACT:
A fuse element includes a fusible conductor which extends within a gas filled cavity in a cylindrical tube. The fuse element includes a cylindrical tube comprising, an electrical insulator between two end faces of the tube, two end caps of an electrically conductive material being applied to the two ends of the tube such that an electrical contact is produced with the fusible conductor. At least one respective sealing element is inserted in at least one of the two ends in a space between the cap base and the end face of the tube and/or into a portion of the cavity of the tube adjacent to the end face such that one or more pressure balancing passages remain between the gas filled cavity within the tube and the external surroundings of the fuse element. The one or more pressure balancing passages are of such small cross-section that changes in pressure in the cavity are balanced only very slowly. A sudden increase in pressure in the cavity, such as occurs as a result of an arc, which is produced when the fusible conductor ruptures, can act to quench the arc.

REFERENCES:
patent: 1700080 (1929-01-01), Sandin
patent: 2135166 (1938-11-01), Bussman
patent: 2166174 (1939-07-01), Popp
patent: 4158187 (1979-06-01), Perreault
patent: 4656453 (1987-04-01), Reeder
patent: 5198792 (1993-03-01), Bacon et al.
patent: 5235307 (1993-08-01), Oh
Mechanical Behavior, Properties and Behavior of plastics, Canadian Building Digest, 1973, pp. 2-7, downloaded from http://irc.nrc-cnrc.gc.ca/pubs/cbd/cbd157—e.html.
Plastic materials having a yield strength above 10MPa obtained from a search at www.matweb.com.

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