Foam fuse filler and cartridge fuse

Patent metadata

Field	Value
Publication number	US-9911566-B2
Application number	US-201414503876-A
Country	US
Kind code	B2
Filing date	Oct 1, 2014
Priority date	Oct 18, 2013
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

Fuses having a melamine-coated-steatite foam filler are described. In particular, melamine-coated-steatite foam filler for use in a fuse comprising steatite coated in a melamine compound (e.g., plasticized melamine resin) and then heated to form crystalline foam filler are described. The foam filler may comprise steatite of substantially 3 times the melamine compound by weight and may be heated and then cooled to form the foam filler.

First claim

What is claimed is:

1. A melamine-coated-steatite foam filler for use in a fuse comprising:
a mixture of particles, including:
a melamine compound; and
a steatite of at least 2 times the melamine compound by weight, wherein
the mixture of particles is heatable such that the melamine compound is melted to bond to the steatite to form the melamine-coated-steatite foam filler, the melamine-coated-steatite foam filler having a rigid crystalline structure to contain an electric arc of the fuse.

2. The melamine-coated steatite foam filler of claim 1 , comprising the steatite of substantially 3 times the melamine compound by weight.

3. The melamine-coated steatite foam filler of claim 1 , wherein the melamine compound and the steatite are heated to form the melamine-coated-steatite foam filler crystalline structure in the fuse.

4. The melamine-coated-steatite foam filler of claim 3 , wherein the melamine compound and the steatite are heated to between 50 and 250 degrees Celsius for between 1 and 900 minutes to form the foam filler.

5. The melamine-coated steatite foam filler of claim 1 , wherein the melamine compound and the steatite are heated to between 150 and 180 degrees Celsius and cooled to room temperature to form the melamine-coated-steatite foam filler crystalline structure in the fuse.

6. A fuse comprising:
a hollow body having a cavity therein;
a fuse element disposed in the cavity;
first and second end caps in electrical connection with the fuse element; and a melamine-coated-steatite foam (MCSF) filler disposed in the cavity around the fuse element, the MCSF filler comprising:
a mixture of particles, including:
a melamine compound; and
a steatite of at least 2 times the melamine compound by weight, wherein the mixture of particles is heatable such that the melamine compound is melted to bond to the steatite to form the melamine-coated-steatite foam filler,
the melamine-coated-steatite foam (MCSF) filler having a rigid crystalline structure configured to contain an electric arc of the fuse.

7. The fuse of claim 6 , comprising the steatite of substantially 3 times the melamine compound by weight.

8. The fuse of claim 6 , wherein the melamine compound and the steatite are heated to form the melamine-coated-steatite foam filler crystalline structure filler.

9. The fuse of claim 8 , wherein the melamine compound and the steatite are heated to between 50 and 250 degrees Celsius for between 1 and 900 minutes to form the melamine-coated-steatite foam filler crystalline structure filler.

10. The fuse of claim 6 , wherein the melamine compound and the steatite are heated to between 150 and 180 degrees Celsius and cooled to room temperature to form the melamine-coated-steatite foam filler crystalline structure filler.

Assignees

• Littelfuse Inc

Inventors

• Retardo Roel
• Enriquez Albert

Classifications

• Y10T29/49107

  Fuse making · CPC title

• H01H85/165

  Casings · CPC title

• H01H33/765

  the gas-evolving material being incorporated in the contact material · CPC title

• H01H33/72

  having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber · CPC title

• H01H2085/388

  using special materials · CPC title