Improvement in time delay fuse

Details Improvement in time delay fuse Improvement in time delay fuse

H - Electricity

01

H

H01H 85/055 (2006.01) H01H 85/0445 (2006.01) H01H 85/38 (2006.01) H01H 85/00 (2006.01)

Patent

CA 2155301

A time delay fuse (10) and various subassembly for that time delay fuse. The fuse includes a housing (12) made of an insulating material. The housing encloses a short-circuit fusible element (30), preferably a copper or copper alloy strip having a plurality of slots (34). The housing also encloses one or more rigid meltable fusible elements (46, 48), preferably a plurality of solder bars. A body (62) of resilient, compressible insulating material has at least one passageway through which each of the time delay fusible elements extends. When the rigid meltable fusible elements melt, the circuit through the fuse opens. In addition, the passageway which surrounded the rigid meltable fusible elements collapses upon its melting. This provides protection against "arc-back".

Fusible à fusion temporisée (10) et différents sous-ensembles pour ce dernier. Le fusible comprend un boîtier (12) en matériau isolant. Le boîtier renferme un élément fusible (30) faisant court-circuit, de préférence une bande en cuivre ou en alliage de cuivre comportant plusieurs fentes (34). Le boîtier renferme également un ou des éléments fusibles rigides (46, 48), de préférence plusieurs barres de soudure. Un bloc (62) de matériau isolant comprimable élastique comprend au moins un passage à travers lequel chacun des éléments à fusion temporisée s'allongent. Lorsque les éléments fusibles rigides fondent, le circuit qui traverse le fusible s'ouvre. En outre, le passage qui entourait les éléments fusibles rigides s'affaisse au moment de la fonte, ce qui assure une protection contre le retour d'arc.

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