Electrical fuse with indicator

Details Electrical fuse with indicator Electrical fuse with indicator

H - Electricity

01

H

H01H 85/30 (2006.01) H01H 85/02 (2006.01)

Patent

CA 2393643

An electric fuse (10) is comprised of a tubular fuse casing (12) formed of an electrically insulating material. A first conductive component (2) is attached to a first end of the casing (12) and a second conductive component (3) is attached to a second end of the casing (12). A first conductive path is formed through the tube (12) between the first (2) and second (3) conductive components. The conductive path includes a fusible element (20) having a first resistance. A second conductive path (44) is formed along the exterior of the tubular fuse casing (12). The second conductive path (44) is in parallel to the first conductive path (20) and has a second resistance greater than the first resistance. The second conductive path (44) includes an indicator component (40). The indicator component (40) is comprised of a first layer (42) comprised of a colored material, and a second layer (44) comprised of an electrically conductive material deposited onto the first layer (42). The second layer (44) has a region (44a) of increased resistance. An inner cavity (72) is located above the region (44a) of increased resistance on the second layer (44). A third layer (66) comprised of a transparent, polymeric material covers the cavity (72) and the first (42) and second (44) layers.

L'invention porte sur un fusible (10) comportant une enveloppe tubulaire (12) faite d'un matériau isolant, munie à une première extrémité d'un premier élément conducteur (2), et à l'autre extrémité d'un deuxième élément conducteur (3) reliés par une première liaison conductrice traversant le tube (12) et incluant un élément fusible présentant une première résistance. Une deuxième liaison conductrice (44) parallèle à la première (20), passant à l'extérieur de la gaine du tube (12), et présentant une deuxième résistance supérieure à la première, comporte un voyant (40) fait d'une première couche (42) d'un matériau coloré et d'une deuxième couche (44) d'un matériau conducteur déposée sur la première (42) et présentant une zone (44a) de plus forte résistance au-dessus de laquelle (44a) se situe une cavité intérieure (72) recouverte d'un troisième couche (66) d'un polymère transparent qui recouvre également la première couche (42) et la deuxième couche (44).

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