Circuit breaker

Patent metadata

Field	Value
Publication number	US-9774180-B2
Application number	US-201514704641-A
Country	US
Kind code	B2
Filing date	May 5, 2015
Priority date	May 30, 2014
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

A circuit breaker according to the present invention includes a terminal switching unit mounted in an enclosure thereof, and the terminal switching unit accommodates, in a base as an outer casing thereof, a fixed contactor and a movable contactor contactable with and separated from each other, a sliding unit rotatably supporting the movable contactor, and a detection mechanism to detect a fault current. Radiators are provided at side portions of at least one of a contact portion where the movable contactor comes in contact with the fixed contactor, the sliding unit and the detection mechanism, each radiator radiating heat to the outside of the base. This may prevent an increase in temperature of the circuit breaker within a limited space without an increase in costs.

First claim

What is claimed is:

1. A circuit breaker comprising:
an enclosure thereof; and
a terminal switching unit mounted in the enclosure,
wherein the terminal switching unit accommodates, in a base as an outer casing thereof:
a fixed contactor fixed thereto;
a movable contactor contactable with and separated from the fixed contactor;
a sliding unit rotatably supporting the movable contactor; and
a detection mechanism to detect a fault current,
wherein radiators are provided at side portions of at least one of a contact portion where the movable contactor comes in contact with the fixed contactor, the sliding unit and the detection mechanism, each radiator radiating heat to the outside of the base.

2. The circuit breaker of claim 1 , wherein each sidewall of the base is configured such that an outer wall surface of a first portion thereof with the radiator provided thereon is more recessed than an outer wall surface of a second portion located at a periphery of the first portion.

3. The circuit breaker of claim 2 , wherein the outer wall surface of the second portion is closely adhered on the enclosure of the circuit breaker, and the outer wall surface of the first portion is spaced apart from the enclosure of the circuit breaker.

4. The circuit breaker of claim 2 , wherein each sidewall of the base is configured such that an outer wall surface of a third portion located at one corner thereof is more recessed than the outer wall surface of the second portion and extends toward the outer wall surface of the first portion.

5. The circuit breaker of claim 4 , wherein a flatness-securing protrusion is provided at one side of the third portion, wherein the flatness-securing protrusion protrudes from the outer wall surface of the third portion up to a height of the outer wall surface of the second portion.

6. The circuit breaker of claim 1 , wherein each sidewall of the enclosure of the circuit breaker is configured such that an inner wall surface of a portion thereof with the radiator is more recessed than an inner wall surface of the other portion thereof.

7. The circuit breaker of claim 6 , wherein the inner wall surface of the other portion is closely adhered on the base, and the inner wall surface of the portion with the radiator is spaced apart from the base.

8. The circuit breaker of claim 1 , wherein a vent hole is formed through the enclosure of the circuit breaker such that air flows therethrough, and
wherein the vent hole communicates with the radiator.

9. The circuit breaker of claim 8 , wherein the vent hole is formed in a shape of a slit long in a vertical direction.

10. The circuit breaker of claim 8 , wherein the vent hole is provided in plurality.

Assignees

• Lsis Co Ltd

Inventors

• Kim Woong Jae

Classifications

• H01H1/62 Primary

  Heating or cooling of contacts · CPC title

• H01H1/226 Primary

  having a plurality of parallel contact bars · CPC title

• H05K7/20127

  Natural convection · CPC title

• H01H73/50

  reset by lever · CPC title

• H01H9/52 Primary

  Cooling of switch parts (cooling of contacts H01H1/62) · CPC title