# US 2018/0025876 A1 · Mechanism coupling structure of molded case circuit breaker

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- Number: US 2018/0025876 A1
- Document ID: US20180025876A1
- Status: Published application
- Kind: A1
- Application number: 15/473,530
- Filed: 2017-03-29
- Published: 2018-01-25
- Earliest claimed: 2016-07-22
- Assignees: Lsis Co., Ltd.
- Applicants: Lsis Co., Ltd.
- Inventors: Sungrok YOO; Kihwan OH
- Web page: https://patentgrep.com/patent/US20180025876A1

## CPC

- H01H 71/0207: {Mounting or assembling the different parts of the circuit breaker}
- H01H 71/10: Operating or release mechanisms
- H01H 71/1009: {Interconnected mechanisms (H01H71/1045 takes precedence; operated by excess current and other electrical conditions H01H83/20)}
- H01H 71/0214: {Housing or casing lateral walls containing guiding grooves or special mounting facilities (H01H71/0221 takes precedence)}
- 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

A mechanism coupling structure of a molded-case circuit breaker according to an embodiment of the present disclosure including a shaft to one side of which a movable contactor is coupled, and on a part of which a rotating pinhole is formed in a penetrating manner; a base assembly into which the shaft is rotatably accommodated and coupled, a switch mechanism coupled to an upper portion of the base assembly and exposed with a first lower link and a second lower link at a lower side thereof, and a rotating pin coupled in a penetrating manner to the first lower link, second lower link and rotating pinhole may be provided therein, wherein the rotating pin has a protruding portion for release prevention at one end thereof.

## Claims

### Claim 1

A mechanism coupling structure of a molded-case circuit breaker, comprising a shaft to one side of which a movable contactor is coupled, and on a part of which a rotating pinhole is formed in a penetrating manner; a base assembly into which the shaft is rotatably accommodated and coupled, a switch mechanism coupled to an upper portion of the base assembly and exposed with a first lower link and a second lower link at a lower side thereof, and a rotating pin coupled in a penetrating manner to the first lower link, second lower link and rotating pinhole,
wherein the rotating pin has a protruding portion for release prevention at one end thereof.

### Claim 2 (depends on 1)

The mechanism coupling structure of a molded-case circuit breaker of claim 1, wherein the rotating pin comprises a first rotating pin having a first protruding portion and a second rotating pin having a second protruding portion.

### Claim 3 (depends on 1)

The mechanism coupling structure of a molded-case circuit breaker of claim 1, wherein the first rotating pin and second rotating pin are symmetrically provided in such a manner that the first protruding portion and second protruding portion face outward.

### Claim 4 (depends on 1)

The mechanism coupling structure of a molded-case circuit breaker of claim 1, wherein the first protruding portion and second protruding portion are brought into contact with the first lower link and second lower link.

### Claim 5 (depends on 1)

The mechanism coupling structure of a molded-case circuit breaker of claim 1, wherein an arc-shaped pinhole is formed on the base assembly to expose the rotating pinhole when the shaft rotates, and a discharge groove configured to open a part of the pinhole is formed at a lower portion of the first lower link and second lower link to discharge an arc pressure generated at the time of interruption to an outside thereof.

### Claim 6 (depends on 5)

The mechanism coupling structure of a molded-case circuit breaker of claim 5, wherein the discharge groove is formed by cutting a part of the first lower link and second lower link.

### Claim 7 (depends on 1)

The mechanism coupling structure of a molded-case circuit breaker of claim 1, wherein a screw groove and a screw portion are formed at body end portions of the first rotating pin and second rotating pin, respectively, to allow the first rotating pin and second rotating pin to be screw-coupled to each other.

### Claim 8 (depends on 1)

The mechanism coupling structure of a molded-case circuit breaker of claim 1, wherein threads are formed on rotating pin coupling holes of the first lower link and second lower link, and the first rotating pin and second rotating pin are configured with screws.