Non-arcing fuse

Patent metadata

Field	Value
Publication number	US-10074501-B2
Application number	US-201615256849-A
Country	US
Kind code	B2
Filing date	Sep 6, 2016
Priority date	Sep 6, 2016
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

An arc-mitigating fuse including a tubular fuse body, a first endcap covering a first end of the fuse body and a second endcap covering a second end of the fuse body, a fusible element disposed within the fuse body and extending between the first endcap and the second endcap to provide an electrically conductive pathway therebetween, and an arc-mitigating element disposed within the fuse body and held in a compressed state between the first endcap and the second endcap, the arc-mitigating element adapted to extend to an uncompressed state upon separation of the fusible element.

First claim

The invention claimed is:

1. An arc-mitigating fuse comprising:
a tubular fuse body;
a first endcap covering a first end of the fuse body and a second endcap covering a second end of the fuse body;
a fusible element disposed within the fuse body and extending between the first endcap and the second endcap to provide an electrically conductive pathway therebetween; and
an arc-mitigating element disposed within the fuse body and held in a compressed state between the first endcap and the second endcap, the arc-mitigating element adapted to extend to an uncompressed state upon separation of the fusible element, the arc-mitigating element providing a first electrically conductive pathway extending from the first end cap to the second endcap, and the fusible element providing a second electrically conductive pathway extending from the first end cap to the second endcap, the first and second electrically conductive pathways being electrically in parallel with one another and being electrically independent and separate from one another.

2. The arc-mitigating fuse of claim 1 , wherein the arc-mitigating element exhibits a first electrical resistance in the compressed state and a second electrical resistance in the uncompressed state, the second electrical resistance being greater than the first electrical resistance.

3. The arc-mitigating fuse of claim 2 , wherein the first electrical resistance is in a range between 1 ohm and 20 ohms and the second electrical resistance is in a range between 1 mega ohm and 100 mega ohms.

4. The arc-mitigating fuse of claim 1 , wherein the arc-mitigating element is formed of a quantum tunneling compound.

5. The arc-mitigating fuse of claim 1 , wherein the arc-mitigating element is a tubular member having an uncompressed length that is greater than a length of the fusible element.

6. The arc-mitigating fuse of claim 1 , wherein the arc-mitigating element biases the first endcap and the second endcap away from one another to hold the fusible element in tension.

7. The arc-mitigating fuse of claim 1 , wherein one of the first endcap and the second endcap is fastened to the fuse body.

8. The arc-mitigating fuse of claim 1 , wherein one of the first endcap and the second endcap is fastened to the arc-mitigating element in electrical communication therewith.

9. The arc-mitigating fuse of claim 1 , wherein the first endcap and the second endcap are fastened to the arc-mitigating element in electrical communication therewith.

10. The arc-mitigating fuse of claim 1 , wherein the fusible element is rigidly secured to the first endcap and to the second endcap to retain the arc-mitigating element in the compressed state.

Assignees

• Littelfuse Inc

Inventors

• Johnson Brian

Classifications

• H01H85/143

  Electrical contacts; Fastening fusible members to such contacts · CPC title

• H01H85/38 Primary

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

• H01H85/175

  characterised by the casing shape or form · CPC title

• H01H69/02

  Manufacture of fuses · CPC title

• H01H2085/385

  Impedances connected with the end contacts of the fusible element · CPC title