Active/passive fuse module

Patent metadata

Field	Value
Publication number	US-12308194-B2
Application number	US-202318198016-A
Country	US
Kind code	B2
Filing date	May 16, 2023
Priority date	Jul 14, 2022
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

An active/passive fuse module including a fuse having an electrically insulating fuse body, first and second endcaps disposed on opposing ends of the fuse body, a fusible element extending through the fuse body between the first endcap and the second endcap, and an arc quenching material disposed within the fuse body and surrounding the fusible element. The fuse module further includes a pyrotechnic interrupter (PI) coupled to the fuse body, the PI having a housing defining a shaft, a piston disposed within the shaft, a drive pin extending from the piston into the fuse body, the drive pin terminating in a cutter disposed adjacent the fusible element, and a pyrotechnic ignitor disposed within the shaft above the piston configured to detonate upon receiving an initiation signal from a controller, whereby the piston and the drive pin are forcibly driven through the shaft causing the cutter to separate the fusible element.

First claim

The invention claimed is:

1. An active/passive fuse module comprising:
a fuse comprising:
an electrically insulating fuse body;
first and second endcaps disposed on opposing ends of the fuse body;
a fusible element extending through the fuse body between the first endcap and the second endcap; and
an arc quenching material disposed within the fuse body and surrounding the fusible element;

a pyrotechnic interrupter (PI) coupled to the fuse body, the PI comprising:
a housing defining a shaft;
a piston disposed within the shaft;
a drive pin extending from the piston into the fuse body, the drive pin terminating in a cutter disposed adjacent the fusible element; and
a pyrotechnic ignitor disposed within the shaft above the piston configured to detonate upon receiving an initiation signal from a controller, whereby the piston and the drive pin are forcibly driven through the shaft causing the cutter to separate the fusible element; and
a crush rib disposed below the fusible element and aligned with the cutter, wherein the crush rib at least partially fills a space directly underneath the cutter and the fusible element to block the arc-quenching material from packing into the space, and wherein the crush rib provides a medium having a lower mechanical resistance than the arc-quenching material through which the cutter can pass when the PI is detonated.

2. The active/passive fuse module of claim 1 , wherein the fusible element has a bridge portion that is mechanically weaker than surrounding portions of the fusible element, and wherein the cutter is aligned with the bridge portion and is configured to pass directly through the bridge portion upon detonation of the PI.

3. The active/passive fuse module of claim 2 , wherein a tip of the cutter is pointed.

4. The active/passive fuse module of claim 1 , wherein the fusible element includes an intermediate portion spanning between a first bridge portion and a second bridge portion, wherein the first bridge portion and the second bridge portion are mechanically weaker than the intermediate portion, and wherein the cutter is aligned with the intermediate portion and is configured to directly engage the intermediate portion upon detonation of the PI and to cause the fusible element to separate at the first bridge portion and the second bridge portion.

5. The active/passive fuse module of claim 4 , wherein a tip of the cutter is blunt.

6. The active/passive fuse module of claim 1 , wherein the cutter is formed of a dielectric material.

7. The active/passive fuse module of claim 1 , wherein the cutter is formed of an electrically conductive material.

8. The active/passive fuse module of claim 1 , wherein the housing of the PI is clamped onto the fuse body of the fuse.

9. The active/passive fuse module of claim 1 , wherein a tip of the cutter is fastened to the fusible element to secure a position of the cutter relative to the fusible element.

10. The active/passive fuse module of claim 1 , wherein the crush rib is formed of silicone foam.

11. An active/passive fuse module comprising:
a fuse comprising:
an electrically insulating fuse body;
first and second endcaps disposed on opposing ends of the fuse body;
a plurality of fusible elements extending through the fuse body between the first endcap and the second endcap; and
a pyrotechnic interrupter (PI) coupled to the fuse body, the PI comprising:
a housing defining a shaft;
a piston disposed within the shaft;
a drive pin extending from the piston into the fuse body, the drive pin terminating in a cutter, wherein at least one of the plurality of fusible elements extends through a respective through hole in the cutter and wherein a bottom edge of the cutter is disposed above at least another one of the plurality of fusible elements; and
a pyrotechnic ignitor disposed within the shaft above the piston configured to detonate upon receiving an initiation signal from a controller, whereby the piston and the drive pin are forcibly driven through the shaft causing the cutter to separate the plurality of fusible elements.

12. The active/passive fuse module of claim 11 , wherein each of the plurality of fusible elements has a plurality of bridge legs that are parallel to one another and that are mechanically weaker than surrounding portions of the plurality of fusible elements, and wherein the cutter is aligned with the bridge legs and is configured to pass directly through the bridge legs upon detonation of the PI.

13. The active/passive fuse module of claim 11 , wherein the cutter is formed of a dielectric material.

14. The active/passive fuse module of claim 11 , wherein the cutter is formed of an electrically conductive material.

15. The active/passive fuse module of claim 11 , wherein the cutter is fastened to at least one of the plurality of fusible elements to secure a position of the cutter relative to the plurality of fusible elements.

16. The active/passive fuse module of claim 11 , further comprising an arc quenching material disposed within the fuse body and surrounding the plurality of fusible elements.

17. The active/passive fuse module of claim 16 , further comprising a crush rib disposed below the plurality of fusible elements and aligned with the cutter, wherein the crush rib at least partially fills a space directly underneath the cutter and the plurality of fusible elements to block the arc-quenching material from packing into the space, and wherein the crush rib provides a medium having a lower mechanical resistance than the arc-quenching material through which the cutter can pass when the PI is detonated.

18. The active/passive fuse module of claim 17 , wherein the crush rib is formed of silicone foam.

19. The active/passive fuse module of claim 11 , wherein the cutter comprises a plurality of cutters spaced apart from one another along lengths of the plurality of fusible elements, wherein the plurality of cutters are configured to separate the plurality of fusible elements at various points along the lengths of the plurality of fusible elements when the PI is detonated.

Assignees

• Littelfuse Inc

Inventors

• Hetzmannseder Engelbert
• Lasini Derek
• Burns David Arthur

Classifications

• H01H85/38

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

• H01H85/18

  Casing fillings, e.g. powder · CPC title

• H01H39/006

  Opening by severing a conductor · CPC title

• H01H85/10

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

• H01H85/12

  Two or more separate fusible members in parallel · CPC title