Air circuit breaker

Patent metadata

Field	Value
Publication number	US-10141140-B2
Application number	US-201715616850-A
Country	US
Kind code	B2
Filing date	Jun 7, 2017
Priority date	Dec 5, 2016
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

The present invention relates to an air circuit breaker, in which a recess is formed on one side or each of both sides of each contact plate provided in an insulating cage so as to reduce a contact area between a movable contactor and the contact plate when the movable contactor and the contact plate are brought into contact with each other, thereby preventing a contact portion between the movable contactor and the contact plate from being melted due to heat generation.

First claim

What is claimed is:

1. An air circuit breaker comprising:
an insulating cage provided with a plurality of contact plates;
movable contactors each inserted between the contact plates; and
fixed contactors brought into contact with or separated from the movable contactors in response to a movement of the movable contactors,
wherein each of the contact plates is provided with a recess,
wherein the recess is inclined toward an inside of the contact plates from rear sides of the contact plates to front sides of the contact plates,
wherein in a connected state, the movable contactors are pushed toward the insulating cage to be inserted between the contact plates and thus brought into contact with the contact plates, and
wherein a middle part of the movable contactors does not contact the contact plates by the recess.

2. The air circuit breaker of claim 1 , wherein the recess is formed on each of both side surfaces of the contact plate.

3. The air circuit breaker of claim 2 , wherein the recess has a rectangular or circular section.

4. The air circuit breaker of claim 1 , wherein the recess is located at a position adjacent to a contact portion between the movable contactor and the fixed contactor in a state that the movable contactor and the fixed contactor are brought into contact with each other.

5. The air circuit breaker of claim 1 , wherein the contact plate and the insulating cage are made of different materials from each other.

6. An air circuit breaker comprising:
an insulating cage provided with a plurality of contact plates;
movable contactors each inserted between the contact plates; and
fixed contactors brought into contact with or separated from the movable contactors in response to a movement of the movable contactors,
wherein each of both side surfaces of the contact plates is provided with a recess,
wherein the recess has a rectangular or circular section, and
wherein the recess is provided in plurality, and a depth of each of the recesses changes as the recess extends from a rear to front sides of the contact plate.

7. An air circuit breaker comprising:
an insulating cage provided with a plurality of contact plates;
movable contactors each inserted between the adjacent contact plates; and
fixed contactors brought into contact with or separated from the movable contactors in response to a movement of the movable contactors,
wherein each of the contact plates is provided with a recess,
wherein the contact plate and the insulating cage are made of different materials from each other, and
wherein the contact plate is made of a material having relatively higher thermal resistance than that of the insulating cage.

8. The air circuit breaker of claim 7 , wherein the contact plate is made of a thermosetting or thermoplastic resin composite.

9. The air circuit breaker of claim 7 , wherein the insulating cage is made of a thermosetting or thermoplastic resin composite.

Assignees

• Lsis Co Ltd

Inventors

• Park Woojin

Classifications

• H01H31/02 Primary

  Details · CPC title

• H01H1/225

  the supporting member being pivotable · CPC title

• H01H1/226 Primary

  having a plurality of parallel contact bars · CPC title

• H01H2001/228

  with insulating spacers between the contact bars · CPC title

• H01H33/60

  Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid · CPC title