Electrical fuse with pyrotechnic blowout indicator

Details Electrical fuse with pyrotechnic blowout indicator Electrical fuse with pyrotechnic blowout indicator

1984-09-20

1986-07-29

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337265, H01H 8530

Patent

active

046033157

ABSTRACT:
An electrical fuse features a pyrotechnic smoke-generating mixture supported proximate to or adheringly supported on a meltable fuse wire element. A portion of the fuse housing is transparent. Upon either low current or high current blowout the local temperatures attendant thereto cause ignition of the pyrotechnic mixture and evolution of a cloud of colored smoke which deposits on the interior of the transparent portion of the housing to yield a readily visible indication that the fuse has blown. Additionally, when the fuse is operated at temperatures close to blowout conditions, a different colored smoke is produced to indicate incipient fuse deterioration.

REFERENCES:
patent: 1033754 (1912-07-01), Buchanan
patent: 2007313 (1935-07-01), Sherwood

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