Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Patent
1977-09-27
1980-01-29
Harris, George
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
337241, 337244, H01H 8530
Patent
active
041863658
ABSTRACT:
An improved high-voltage fuse, the blown or unblown condition of which can be readily ascertained, is disclosed. Known fuses include a fusible element and a movable component, such as an arcing rod, which is held in a normal first position as long as the fusible element is present and remains intact. When the element fuses and arc is struck, the arcing rod moves through an arc-extinguishing medium to extinguish the arc, coming to rest in a second position. The fusible element, arcing rod, and arc-extinguishing medium are contained within an opaque, insulative housing for the fuse. In the improved fuse, the housing is made of an insulative material which is translucent. The housing's translucency is such that it may be difficult if not impossible to observe the condition of the fuse--blown or unblown--from the fuse's exterior. Accordingly, a member, mounted for movement with the arcing rod, is provided. The member is so configured and colored that an image thereof is readily visible through the translucent housing. The location of the image indicates the condition of the fuse. Facilitites may be associated with the housing to indicate the significance of the image location as it relates to fuse condition. These facilities may be an indicium, including lines or legends, which may bear a predetermined positional relationship to the member's image and which may instruct the observer of the significance of the location of the member image as it relates to the fuse's condition.
REFERENCES:
patent: 3225170 (1965-12-01), Chabala et al.
patent: 3852556 (1974-12-01), Kane et al.
patent: 3924216 (1975-12-01), Martin et al.
patent: 4016384 (1977-04-01), Le Row, Jr. et al.
Harris George
Kaufmann John D.
S&C Electric Company
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