Ventilated fuse housing

Patent metadata

Field	Value
Publication number	US-10930463-B2
Application number	US-201916403520-A
Country	US
Kind code	B2
Filing date	May 4, 2019
Priority date	Nov 15, 2016
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

A fuse including a first housing part and a second housing part that are joined together to define a cavity, a fuse element disposed within the cavity, a first terminal extending from a first end of the fuse element and out of the housing, and a second terminal extending from a second end of the fuse element and out of the housing, the housing having a vent channel extending from an outer surface of the housing to the cavity for allowing vapor to escape from the cavity.

First claim

What is claimed is:

1. A method of forming a fuse, comprising:
joining a first housing part to a second housing part to form a housing that defines a cavity;
disposing a fuse element within the cavity with a first terminal extending from a first end of the fuse element and out of the housing and a second terminal extending from a second end of the fuse element and out of the housing, the fuse element comprising a curvature;
providing a pair of protrusions within the first housing part and the second housing part, wherein the pair of protrusions extend between the curvature and underneath the fuse element to support and align the fuse element within the cavity; and
providing the housing with a vent channel extending from an outer surface of the housing to the cavity for allowing vapor to escape from the cavity, the vent channel further comprising:
a first pair of vent channels disposed on opposing sides of the housing;
a second pair of vent channels disposed on second opposing sides of the housing, wherein the first pair of vent channels is orthogonal to the second pair of vent channels; and
a wall portion disposed at the outer surface of the housing, the wall portion being thick enough to be molded into the housing but thin enough to rupture during an overload or short circuit condition, the wall portion for preventing ingress of external contaminants into the cavity.

2. The method of claim 1 , wherein joining the first housing part to the second housing part includes mating an alignment portion of the first housing part with an alignment portion of the second housing part to align the first housing part with the second housing part in a desired manner.

3. The method of claim 1 , wherein the first housing part and the second housing part are joined via ultrasonic welding.

4. The method of claim 1 , further comprising an outer barrier attachable to the outer surface of the housing and configured to cover the vent channel for preventing ingress of external contaminants into the cavity.

5. The method of claim 1 , wherein the vent channel defines a non-linear path between the outer surface of the housing and the cavity for mitigating ingress of external contaminants into the cavity.

6. The method of claim 1 , wherein the first pair of vent channels is bisected by either terminal.

Assignees

• Littelfuse Inc

Inventors

• Schlaak Michael

Classifications

• H01H2223/002

  sealed · CPC title

• H01H85/43

  Means for exhausting or absorbing gases liberated by fusing arc, or for ventilating excess pressure generated by heating · CPC title

• H01H85/175 Primary

  characterised by the casing shape or form · CPC title

• H01H85/055

  Fusible members · CPC title

• H01H85/0452

  with parallel side contacts · CPC title