High-current fuse with endbell assembly

Patent metadata

Field	Value
Publication number	US-9761402-B2
Application number	US-201514699407-A
Country	US
Kind code	B2
Filing date	Apr 29, 2015
Priority date	Nov 14, 2014
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

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 fuse, comprising:
a fuse body having an inner cavity and fuse body aperture;
a fuse element comprising a first terminal and a second terminal, a portion of the fuse element disposed within the inner cavity, the first terminal and the second terminal disposed outside of the fuse body;
a first endbell and a second endbell coupled to the fuse element, wherein the first endbell includes a first barrier and the second endbell includes a second barrier, the first endbell and the second endbell having outer grooves filled with an adhesive securing the first endbell and the second endbell to the fuse body;
an arc quenching material disposed within the inner cavity, the arc quenching material contacting at least a portion of the fuse element; and
end caps coupled to the fuse body, the end caps sealing a portion of the fuse element within the fuse body;
wherein the first barrier and the second barrier seal the arc quenching material inside the inner cavity of the fuse body; and
wherein the fuse body aperture is radially aligned with the outer groove of one of the first end bell and the second end bell relative to a longitudinal axis of the fuse body.

2. The fuse of claim 1 , wherein the fuse body is a hollow insulating tube.

3. The fuse of claim 1 , wherein a predetermined amount of the arc quenching material is compacted in the inner cavity.

4. The fuse of claim 1 , wherein the arc quenching material surrounds the fuse element between the first endbell and the second endbell.

5. The fuse of claim 1 , wherein the first barrier and the second barrier are disposed on a first end and a second end, respectively, of the arc quenching material, and seal the arc quenching material from the first endbell and from the second endbell.

6. The fuse of claim 1 , wherein the first endbell is coupled to the first terminal and the second endbell is coupled to the second terminal.

7. The fuse of claim 1 , wherein the first endbell and the second endbell each include a first endbell section and a second endbell section, the first endbell section and the second endbell section coupled together to form a chamfered joint.

8. The fuse of claim 1 , wherein the first endbell and the second endbell are cup-shaped.

9. The fuse of claim 1 , wherein the fuse element and the first endbell and the second endbell within the 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.

10. The fuse of claim 9 , 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.

11. The fuse of claim 1 , wherein the fuse element is diagonal shaped.

12. A fuse comprising:
a fuse element comprising a conductive first strip and a second conductive strip arranged in one of a plurality of geometric configurations, the fuse element further including a set of electrically conductive bridges interconnecting adjacent portions of the first conductive strip and the conductive second strip, the set of electrically conductive bridges electrically connecting the first conductive strip and the second conductive strip;
a first terminal and a second terminal coupled to the fuse element, the first terminal and the second terminal electrically connecting the fuse to a circuit to be protected and to a power source;
a first endbell and a second endbell coupled to the fuse element;
a hollow fuse body having a first fuse body aperture and a second fuse body aperture, the hollow fuse body configured for receiving a portion of the fuse element and the first endbell and the second endbell, the first endbell and the second endbell including outer grooves, the outer grooves radially aligned with the first and second fuse body apertures relative to a longitudinal axis of the fuse body; and
a predetermined amount of arc quenching material disposed between the first endbell and the second endbell within the hollow fuse body, the arc quenching material surrounding at least a portion of the fuse element, wherein the predetermined amount of the arc quenching material is less than a total volume of the hollow fuse body,
wherein at least one barrier formed from a liquid adhesive is disposed on at least one end of the arc quenching material, the at least one barrier separating at least one of the first endbell and the second endbell from the arc quenching material.

13. The fuse of claim 12 , wherein the first endbell and the second endbell each include a first endbell section and a second endbell section, the first endbell section and the second endbell section are coupled together, the first endbell and the second endbell are cup-shaped, wherein the first endbell and the second endbell include a chamfered joint.

14. The fuse of claim 12 , wherein the liquid adhesive forms a first barrier on the first endbell and a second barrier on the second endbell, wherein the arc quenching material surrounding at least a portion of the fuse element is defined between the first barrier and the second barrier.

15. The fuse of claim 12 , further including end caps coupled to the fuse body, the end caps sealing a portion of the fuse element within the fuse body.

Assignees

• Littelfuse Inc

Inventors

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

Classifications

• H01H85/10

  with constriction for localised fusing (H01H85/11 takes precedence) · CPC title

• H01H85/042 Primary

  General constructions or structure of high voltage fuses, i.e. above 1000 V · CPC title

• H01H85/185

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

• H01H85/175

  characterised by the casing shape or form · CPC title

• H01H85/08

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