Over-current protector

• US 20070159292A1
• Filed: 01/11/2007
• Published: 07/12/2007
• Est. Priority Date: 01/12/2006
• Status: Abandoned Application

• Current Assignee: INPAQ Technology Co., Ltd.
• Original Assignee: INPAQ Technology Co., Ltd.
• Inventors: Chang, Kun-Huang, Liu, Wen-Lung
• Application Number:
  US11/651,991
• Publication Number:
  US 20070159292A1
• Time in Patent Office: Days
• US Class Current: 337/159
• CPC Class Codes: H01H 69/02 Manufacture of fuses
• CPC Class Codes: H01H 85/17 characterised by the casing material
• CPC Class Codes: H01H 85/38 Means for extinguishing or suppressing arc by powder filling H01H85/18; by mechanical tension applied to fusible member H01H85/36

Abstract

An over-current protective device is characterized by comprising: a fuse cover, a fusible body disposed therein, and a first electrode and a second electrode respectively extending from the two ends of the fusible body. A method for fabricating the over-current protective device comprises the following steps: stamping a conductive metal sheet to form a frame with a base having two ends respectively extending as a supporting plate, and soldering a fusible unit containing the fusible body between the supporting plates; disposing the frame having the soldered fusible unit into a mold, putting a polymeric material into the mold for covering the fusible body and the supporting plates, and molding the fusible body into a required shape; taking out the frame covered by the polymeric material and cutting the base off so as to obtain an over-current protective device having two electrode plates extending from two ends thereof.

Claims

1. An over-current protector, comprising:

a fuse body, a first electrode and a second electrode respectively extending from the two ends of the fuse body; and

a fuse encapsulant made of a polymer material;

wherein the encapsulant is able to absorb the heat induced from a fuse body that is melted and depress arc.

2. The over-current protector of claim 1, wherein the molecular weight of the polymer material is in a range between 3,000 and 10,000,000.

3. The over-current protector of claim 2, wherein the polymer material is a thermal-plastic material or a thermal-set material.

4. The over-current protector of claim 3, wherein the thermal-plastic material comprises:

(a) crystalline polymer;

polyethylene, polypropylene, nylon 12, nylon 6, nylon 66, nylon 6T, nylon 9T, polybutylene terephthalate, polyethylene terephthalate, polyoxymethylene, PEEK, liquid crystal polymer, ethylene copolymer, or polyphenylene sulfide;

(b) amorphous polymer;

acrylonitrile-butadiene-styrene copolymer, polystyrene, polysulfonate, polydiethyl ether sulfonate, polystyrene oxide, phenoxy resin, polyamide, polyether amide, polyether amide/silicon block copolymer, polycarboxylate, propylene resin, polymethacrylate, styrene, poly(4-methyl-1-pentene), or styrene block copolymer.

5. The over-current protector of claim 3, wherein an anti-oxidant or a filler can be added to the polymer material.

6. The over-current protector of claim 3, wherein a flexible material can be added to the polymer material.

7. The over-current protector of claim 3, wherein an inorganic fiber, an organic fiber or an arc-bearable hydroxide can be added to the polymer material.

8. A method of fabricating an over-current protector, comprising the following steps:

stamping a conductive metal sheet to form a frame with at least one base from which supporting plates extend;

soldering a fusible unit containing a fuse body between the support plates;

disposing the frame which has the soldered fusible unit into a mold;

putting a polymer material into the mold for covering the fuse body and a portion of the support plates as well as molding the fuse body and the support plates into a required shape; and

taking out the frame covered by the polymer material and severing the base.