# US 11,443,911 B2 · Arc chamber of circuit breaker

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- Number: US 11,443,911 B2
- Document ID: US11443911B2
- Status: Granted
- Kind: B2
- Application number: 16/772,556
- Filed: 2018-11-22
- Published: 2020-12-17
- Granted: 2022-09-13
- Earliest claimed: 2017-12-27
- Assignees: Ls Electric Co., Ltd.
- Applicants: Ls Electric Co., Ltd.
- Inventors: Kyunghwan Oh; Kihwan Oh
- Web page: https://patentgrep.com/patent/US11443911B2

## CPC

- H01H 9/362: {Mounting of plates in arc chamber}
- H01H 73/18: Means for extinguishing or suppressing arc {(magnet coil acting as blow-out device H01H71/38)}
- H01H 9/36: Metal parts
- H01H 73/04: Contacts
- H01H 73/06: Housings; Casings; Bases; Mountings
- H01H 2009/365: {using U-shaped plates}
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)

## Abstract

The present device was conceived in order to resolve the aforementioned problem, and the objective thereof is to provide an arc chamber of a circuit breaker that enhances assemblability and ensures the consistency of the product. An arc chamber of the circuit breaker according to one embodiment of the present device comprises: a plurality of grids arranged at predetermined intervals outside a motion locus of a movable contactor and having a body portion and a leg portion extending from one side of the body portion; and a fixing cap having a receiving portion that is inserted into the leg portion in a press-fitting manner, wherein the fixing cap has a coupling portion extending to a side of the body portion at one side thereof.

## Claims

### Claim 1

An arc chamber of a circuit breaker, comprising:
a plurality of grids arranged outside of a motion trajectory of a movable contact at a predetermined interval and including a body portion and a leg portion extending from one side of the body portion; and
a fixing cap having an accommodating portion press-fitted into the leg portion,
wherein the fixing cap is provided with a coupling portion extending to a side surface of the body portion from one side thereof,
wherein a plurality of second protrusions disposed adjacent to the leg portion is provided at both side surfaces of the body portion,
wherein a plurality of fixing holes fitted to the second protrusions is provided on the coupling portion, and
wherein each of the second protrusions is provided with an interference prevention groove provided at both ends thereof in contact with the body portion.

### Claim 2 (depends on 1)

The arc chamber of claim 1, wherein a plurality of first protrusions is provided at both corners of the body portion, and
wherein a plurality of fixing grooves coupled to the first protrusions is provided on an end of the coupling portion.

### Claim 3 (depends on 1)

The arc chamber of claim 1, wherein each of the second protrusions is inclined downwardly toward the leg portion.

### Claim 4 (depends on 1)

The arc chamber of claim 1, wherein the coupling portion is provided with partition walls formed on an inner surface thereof corresponding to a position between each of the first protrusions, so that each of the grids is fitted.

### Claim 5 (depends on 4)

The arc chamber of claim 4, wherein an extended wall extending from the partition wall is provided on an inner wall of the fixing cap.

### Claim 6 (depends on 5)

The arc chamber of claim 5, wherein a thickness of the extended wall is less than a thickness of the partition wall.

### Claim 7 (depends on 5)

The arc chamber of claim 5, wherein a hemispherical protrusion in contact with the extended wall is provided on an upper surface of the leg portion.

### Claim 8 (depends on 4)

The arc chamber of claim 4, wherein a rib that presses the leg portion is provided between the partition walls.