High-current fuse with endbell assembly

Patent metadata

Field	Value
Publication number	US-10262828-B2
Application number	US-201715606081-A
Country	US
Kind code	B2
Filing date	May 26, 2017
Priority date	Nov 14, 2014
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

A fuse includes a fuse element and a fuse body. A portion of the fuse element is housed in a fuse body. The fuse element includes a first terminal and a second terminal disposed outside of the fuse body. The first terminal and the second terminal electrically connects the fuse element to a circuit to be protected and a power source. A first endbell and a second endbell is coupled to the fuse element. A predetermined amount of arc quenching material is disposed within the fuse body. The arc quenching material contacts at least a portion of the fuse element. The predetermined amount of the arc quenching material is less than a total volume size of the fuse tube. The arc quenching material is compacted. A remaining air gap in the fuse tube is filled with a liquid adhesive and cured to a solid state.

First claim

The invention claimed is:

1. A method of manufacturing a fuse comprising:
providing a fuse element having a first end and a second end, the fuse element configured with a first terminal electrically connected to the first end and a second terminal electrically connected to the second end;
coupling a first endbell to the first end of the fuse element and coupling a second endbell to the second end of the fuse element, wherein each of the first endbell and the second endbell are cup-shaped and include an annular groove formed in an outer surface thereof, and wherein at least one of the first end bell and the second end bell has an end bell hole formed therein;
providing a hollow fuse body having an inner cavity and at least two fuse body apertures on the hollow fuse body;
inserting the fuse element into the hollow fuse body and radially aligning the annular grooves of the first end bell and the second end bell with the fuse body apertures relative to a longitudinal axis of the fuse body;
filling the hollow fuse body with a predetermined amount of arc quenching material via the end bell hole;
compacting the arc quenching material via one of vibrating or tapping the hollow fuse body;
injecting, via the end bell hole, a liquid silicone into the hollow fuse body and curing the silicone to a solid state, the liquid silicone filling a remaining air gap adjacent the arc quenching material inside the inner cavity, the liquid silicone being further disposed within the first endbell and the second endbell so as to seal the arc quenching material; and
crimping end caps onto two ends of the hollow fuse body.

2. The method of claim 1 , further including filling the annular grooves of the first endbell and the second endbell with liquid silicone through the at least two fuse body apertures to secure the first endbell and the second endbell to the hollow fuse body.

3. The method of claim 1 , wherein the fuse element and the first endbell and the second endbell within the hollow fuse body form a three-zone fuse, a first zone including at least a liquid adhesive, a second zone including at least the arc quenching material, and a third zone including at least the liquid adhesive, the second zone is between the first zone and the third zone.

4. The method of claim 3 , wherein the first endbell is positioned in the first zone, the second endbell is positioned in the third zone, and a center element of the fuse element is positioned in the second zone, the fuse element traversing through the first zone, the second zone, and the third zone.

5. The method of claim 3 , further including injecting the first endbell and the second endbell with the arc quenching material doped with a dielectric gel.

Assignees

• Littelfuse Inc

Inventors

• Schlaak Michael
• Stumpo Gregory
• Venhaus Ken
• Lasini Derek

Classifications

• H01H85/185

  Insulating members for supporting fusible elements inside a casing, e.g. for helically wound fusible elements · CPC title

• H01H69/02

  Manufacture of fuses · CPC title

• H01H85/18

  Casing fillings, e.g. powder · CPC title

• H01H85/38

  Means for extinguishing or suppressing arc (by powder filling H01H85/18; by mechanical tension applied to fusible member H01H85/36) · CPC title

• H01H85/08

  characterised by the shape or form of the fusible member · CPC title