Cooled electric fuse

Details Cooled electric fuse Cooled electric fuse

1976-07-26

1977-08-09

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337158, 337227, H01H 8502

Patent

active

040414345

ABSTRACT:
In fuses embodying this invention each of the terminal elements has a port for the passage of fluid through the casing of the fuse during normal operation thereof, i.e. while the fuse is carrying current. A tubular fusible element conductively interconnects said port in each of said terminal elements. The fuse further includes a toroidal body of quartz sand filling the space between said casing and said tubular fusible element. The fusible element has perforations covered by annular structures of electric insulating material precluding said quartz sand from penetrating into said tubular fusible element during the normal operation of said fuse. The fuse is further provided with a pair of check valves which open during normal operation of said fuse and then allow the flow of fluid through said tubular fusible element and close on occurrence of a build-up of a predetermined amount of pressure inside of said tubular fusible element and then inhibit said flow of fluid.

REFERENCES:
patent: 2179342 (1939-11-01), Muller
patent: 3183330 (1965-05-01), Barkan et al.
patent: 3251968 (1966-05-01), Cameron
patent: 3453579 (1969-07-01), Cinquin
patent: 3921116 (1975-11-01), Mikulecky

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