Power fuse with zinc-aluminum alloy terminals and methods of fabrication

Patent metadata

Field	Value
Publication number	US-12412722-B2
Application number	US-202418420660-A
Country	US
Kind code	B2
Filing date	Jan 23, 2024
Priority date	Jul 23, 2021
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

A power fuse with zinc-aluminum terminals is provided. The power fuse includes a housing having a first end and a second end. Coupled to the housing at the first end is a first terminal assembly fabricated from a zinc-aluminum alloy, and coupled to the housing at the second end is a second terminal assembly also fabricated from the zinc-aluminum alloy. The first and second terminal assemblies include a copper plating entirely covering an exterior of the zinc-aluminum alloy. A fuse element assembly is positioned inside the housing and is electrically connected between the first terminal assembly and the second terminal assembly.

First claim

What is claimed is:

1. A power fuse comprising:
a housing having a first end and a second end;
a first terminal assembly fabricated from a zinc-aluminum alloy and coupled to the housing at the first end;
a second terminal assembly fabricated from the zinc-aluminum alloy and coupled to the housing at the second end; and
a fuse element assembly positioned inside the housing and electrically connected between the first terminal assembly and the second terminal assembly,
wherein the first terminal assembly and the second terminal assembly each further comprise a copper plating entirely covering an exterior of the zinc-aluminum alloy.

2. The power fuse of claim 1 , wherein the first terminal assembly is a single piece and further comprises a terminal and an end bell.

3. The power fuse of claim 1 , wherein the first terminal assembly further comprises at least one filler hole.

4. The power fuse of claim 1 , wherein the first terminal assembly further comprises a groove sized to receive an end of the fuse element assembly.

5. The power fuse of claim 1 , wherein the first terminal assembly includes a plurality of terminal injection gates.

6. The power fuse of claim 1 , wherein the power fuse is engineered to provide a voltage rating of 120 V or greater.

7. The power fuse of claim 1 , wherein the power fuse is engineered to provide a current rating of 600 A.

8. The power fuse of claim 1 , wherein the zinc-aluminum alloy comprises approximately 4% of aluminum by mass and approximately 95% of zinc by mass.

9. A terminal assembly for a power fuse comprising:
an end bell; and
a terminal extending from the end bell,
wherein the terminal assembly is fabricated from a zinc-aluminum alloy, and the terminal assembly further comprises a copper plating entirely covering an exterior of the zinc-aluminum alloy.

10. The terminal assembly of claim 9 , wherein the terminal assembly is a single piece.

11. The terminal assembly of claim 9 , wherein the terminal assembly further comprises at least one filler hole.

12. The terminal assembly of claim 9 , wherein the terminal assembly further comprises a groove on a side of the end bell opposite the terminal.

13. The terminal assembly of claim 9 , wherein the terminal assembly includes a plurality of terminal injection gates.

14. The terminal assembly of claim 9 , wherein the zinc-aluminum alloy comprises approximately 4% of aluminum by mass and approximately 95% of zinc by mass.

15. A method of fabricating a terminal assembly for a power fuse, comprising:
providing a zinc-aluminum alloy into a die cavity;
casting the terminal assembly as a single piece from the zinc-aluminum alloy; and
plating an entire exterior of the terminal assembly with copper.

16. The method of claim 15 , wherein casting the terminal assembly further comprises casting the terminal assembly to have an end bell and a terminal extending from the end bell.

17. The method of claim 16 , wherein casting the terminal assembly further comprises casting the terminal assembly to have a groove on a side of the end bell opposite the terminal.

18. The method of claim 15 , wherein casting the terminal assembly further comprises casting the terminal assembly to have at least one filler hole.

19. The method of claim 15 , wherein providing a zinc-aluminum alloy further comprises providing the zinc-aluminum alloy through a plurality of injection gates.

20. The method of claim 15 , wherein providing a zinc-aluminum alloy further comprises providing the zinc-aluminum alloy that includes approximately 4% of aluminum by mass and approximately 95% of zinc by mass.

21. The power fuse of claim 1 , wherein each of the first terminal assembly and the second terminal assembly further comprises:
an end bell;
a terminal extending from the end bell; and
a groove on a side of the end bell opposite the terminal.

Assignees

• Eaton Intelligent Power Ltd

Inventors

• Medina Archibaldo Montes
• Douglass Robert Stephen
• Still Jr Frederick Eugene
• Langowska Iwona

Classifications

• H01H85/143

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

• H01H85/0456 Primary

  with knife-blade end contacts · CPC title

• H01H69/02

  Manufacture of fuses · CPC title

• H01H85/153 Primary

  Knife-blade-end contacts · CPC title