阅读说明：本技术 配线用断路器 (Circuit breaker for wiring ) 是由 宋修扬 于 2019-08-22 设计创作，主要内容包括：本发明涉及配线用断路器,更具体而言,涉及提高了电弧保护功能的配线用断路器。本发明一实施例的配线用断路器包括：电源侧端子部,设置于外壳的前方部,并且包括固定触头；指状件组件,与所述固定触头相结合并配置在所述电源侧端子部的前表面上；以及基座总线支撑件,与所述电源侧端子部的上表面和下表面结合,并且形成有使所述指状件组件暴露的指状件孔,在所述基座总线支撑件设置有保护部,所述保护部在所述指状件孔周边包围所述指状件组件。(The present invention relates to a circuit breaker for wiring, and more particularly, to a circuit breaker for wiring having an improved arc protection function. The circuit breaker for wiring according to an embodiment of the present invention includes: a power supply side terminal portion provided at a front portion of the housing and including a fixed contact; a finger member assembly combined with the fixed contact and arranged on a front surface of the power supply side terminal portion; and a base bus bar support coupled to upper and lower surfaces of the power supply side terminal portion and formed with a finger hole exposing the finger assembly, the base bus bar support being provided with a protective portion surrounding the finger assembly around the finger hole.)

1. A circuit breaker for wiring, comprising:

a power supply side terminal portion provided at a front portion of the housing and including a fixed contact;

a finger member assembly combined with the fixed contact and arranged on a front surface of the power supply side terminal portion; and

a base bus bar support combined with the upper and lower surfaces of the power supply side terminal part and formed with a finger hole exposing the finger assembly,

a guard is provided on the base bussing support, the guard surrounding the finger assembly around the finger aperture.

2. The wiring circuit breaker according to claim 1,

partition walls are formed at the base bus bar support to insulate between the phases, and the protection portion is provided between the partition walls and the partition walls or between the partition walls and the side walls.

3. The wiring circuit breaker according to claim 1,

the finger assembly includes:

fingers formed in a pincer shape:

a finger reed providing a contact pressure to the finger; and

a finger holder for securing the finger and finger spring.

4. The wiring circuit breaker according to claim 1,

the protection part is formed by projecting from the front part of the base bus bar support to the rear.

5. The wiring circuit breaker according to claim 4,

the protection part is formed to have a length overlapping with an exhaust cover coupled to the power supply side terminal part.

6. The wiring circuit breaker according to claim 2,

an arc discharge space is provided between the protection portion and the partition wall.

7. The wiring circuit breaker according to claim 1,

the upper surface and the lower surface of the protection part are formed to have different lengths from each other.

8. The wiring circuit breaker according to claim 1,

an escape groove for preventing the protection portion from interfering with a connector connecting the finger assembly and the fixed contact is formed on an upper surface or a lower surface of the protection portion.

9. The wiring circuit breaker according to claim 2,

a plurality of ribs are formed between the protection portion and the partition wall.

Technical Field

The present invention relates to a wiring breaker, and more particularly, to a wiring breaker having an improved arc protection function.

Background

Generally, a Circuit Breaker for wiring (MCCB) is an electrical device that automatically breaks an electrical Circuit to protect the electrical Circuit and a load when an electrical overload state or an electrical short-Circuit fault occurs.

Among such wiring breakers, a wiring breaker used by being connected to a bus bar (Main bus bar) of a Distribution Board (or Distribution Board) is called a Plug-In (Plug-In) wiring breaker.

Fig. 1 to 4 show a conventional plug-in wiring breaker. Fig. 1 is a perspective view of a wiring breaker provided in a distributor plate, fig. 2 is a front side sectional view of the wiring breaker, and fig. 3 is a perspective view of a base bus bar support of the wiring breaker.

In the wiring circuit breaker 1, a power source side terminal portion 1a is connected to a bus bar 2, and a load side terminal portion 1b is coupled to a distribution board panel 4 via a mounting bracket 3. In the case of a three-phase circuit, three bus bars 2 are provided side by side. The bus bar 2 is arranged on one side of the distributor panel 4 by a bus bar mounting bracket 2a made of an insulating material.

A fixed contact (fixed contact arm)5 is provided inside the wiring circuit breaker 1, and a connector 6 and a finger assembly 7 are provided at the power supply side terminal portion 1a to connect the fixed contact 5 and the bus bar 2. Thereby, current can flow from the bus bar 2 to the fixed contact 5 through the finger assembly 7, the connector 6 in order. In the energized state, that is, when the handle 8 is rotated to the On position, the movable contact (not shown) is connected to the fixed contact 5, and a current flows through the circuit.

The finger assembly 7 is configured to have a constant voltage and is engaged with the bus bar 2.

The connector 6 is formed substantially in an "L" shape so as to incorporate the finger assembly 7 at an upper end and to be connected with the fixed contact 5 at a lower end.

A Base bus supporter (Base bus supporter)9 made of an insulator is provided at the power supply side terminal portion 1a of the circuit breaker to protect internal components from high-temperature Arc (Arc) and Gas (Gas) generated from the inside of the circuit breaker and discharged to the outside when a short circuit is cut off, and to secure insulation between conductors or with the outside.

The base bus bar support 9 is formed with a zigzag-shaped entry portion 9a at a front face portion to engage with the bus bar 2. Between each entry 9a the finger assemblies 7 of the respective phases are exposed so as to be connectable with the busbars 2 of the respective phases. An upper surface 9b of the base bus bar supporter 9 is formed to be protruded in a length capable of covering an upper portion of the power source side terminal portion 1a, and a bottom surface 9c of the base bus bar supporter 9 is formed to be extended deeply into a bottom surface of the circuit breaker 1 for wiring to form an exhaust port.

In addition, a finger hole 9d is formed at the front face of the base bus bar support 9 to enable the finger assembly 7 to be exposed.

Observing the exhaust flow of the arc gas (arrows) in the plug-in wiring breaker with reference to fig. 2, the arc generated inside at the time of breaking can directly contact the finger assembly 7.

However, when the arc contacts the finger assembly 7, the finger assembly 7 is damaged, thereby possibly breaking the path of the current flow.

Disclosure of Invention

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a circuit breaker for wiring, which protects a finger assembly from an arc generated at the time of disconnection.

The circuit breaker for wiring according to an embodiment of the present invention includes: a power supply side terminal portion provided at a front portion of the housing and including a fixed contact; a finger member assembly combined with the fixed contact and arranged on a front surface of the power supply side terminal portion; and a base bus bar support coupled to upper and lower surfaces of the power supply side terminal portion and formed with a finger hole exposing the finger assembly, the base bus bar support being provided with a protective portion surrounding the finger assembly around the finger hole.

Wherein a partition wall is formed at the base bus bar support to insulate between phases, and the protection part is disposed between the partition wall and the partition wall or between the partition wall and the sidewall.

And, the finger assembly includes: fingers formed in a pincer shape; a finger spring for providing a contact pressure to the finger; and a finger holder for holding the finger and the finger spring.

The protection part is formed to protrude rearward from a front surface part of the base bus bar support.

The protection portion is formed to have a length that overlaps with an exhaust cover coupled to the power supply side terminal portion.

An arc discharge space is provided between the protection portion and the partition wall.

And, the upper surface and the lower surface of the protection part are formed to have different lengths from each other.

And, a hiding groove for avoiding interference with a connector connecting the finger assembly and the fixed contact is formed on an upper surface or a lower surface of the protection portion.

Further, a plurality of ribs are formed between the protection portion and the partition wall.

According to the wiring circuit breaker of the embodiment of the present invention, since the protection portion for protecting the finger assembly provided for connecting the fixed contact with the bus bar is provided, the finger assembly is protected from the arc generated at the time of disconnection.

This makes it possible to protect the wiring breaker from damage due to insulation breakdown.

Also, the current path is prevented from being broken.

Drawings

Fig. 1 is a perspective view of a conventional circuit breaker for wiring provided in a distributor plate.

Fig. 2 is a front side sectional view of the wiring breaker of fig. 1.

Fig. 3 is a perspective view of a base bus bar support of the wiring circuit breaker of fig. 1.

Fig. 4 is a perspective view of the distribution breaker according to the embodiment of the present invention.

Fig. 5 is a front perspective view of the wiring circuit breaker of fig. 4 with the base bus bar support in a partially cut-away state.

Fig. 6 is a front side sectional view of the wiring breaker of fig. 4.

Fig. 7 is a rear perspective view of a base bus bar support portion of the wiring circuit breaker of fig. 4.

Fig. 8 is a perspective view of the base bus support of fig. 7.

Description of the reference numerals

10: the housing 11: power supply side terminal part

15: fixed contact 17: fastening member

18: handle 19: load side terminal section

20: bus 25: distributor panel

30: base bus bar support 31: entry section

32: upper surface bonding portion 33: lower surface joint part

34: front face 35: finger hole

36: discharge space 37: partition wall

38: protection portion 38 a: dodging groove

38 b: the convex ribs 38 c: discharge space for arc

39: side wall 40: finger assembly

41: the finger 42: finger-shaped reed

43: finger holder 45: connector with a locking member

50: exhaust cover plate

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to enable those skilled in the art to easily carry out the present invention, and thus, do not limit the technical spirit and scope of the present invention.

Fig. 4 is a perspective view of the distribution breaker according to the embodiment of the present invention. Fig. 5 is a front perspective view of the wiring circuit breaker of fig. 4 with the base bus bar support in a partially cut-away state. Fig. 6 is a front side sectional view of the wiring breaker of fig. 4. The terminal structure of the wiring breaker according to each embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The circuit breaker for wiring according to an embodiment of the present invention includes: a power supply side terminal portion 11 provided at a front portion of the housing 10 and including a fixed contact 15; a finger member assembly 40 combined with the fixed contact 15 and arranged on a front surface of the power source side terminal portion 11; and a base bus bar support 30 combined with the upper surface and the lower surface of the power supply side terminal part 11 and formed with a finger hole 35 exposing the finger assembly 40, a protection part 38 being provided at the base bus bar support 30, the protection part 38 surrounding the finger assembly 40 at the periphery of the finger hole 35.

The case 10 of the circuit breaker for wiring is formed in a substantially rectangular parallelepiped box shape. A handle 18 capable of operating the opening and closing mechanism is provided at an upper portion of the housing 10. The handle 18 may be rotated to an On position, an Off position, a reset position.

A power source side terminal portion 11 connectable to a power source (power line) is provided at a front portion (left side in the drawing) of the housing 10, and a load side terminal portion 19 connectable to a load is provided at a rear portion (right side in the drawing).

The power supply terminal portion 11 is provided with a fixed contact 15 (see fig. 6). Although not separately illustrated, a movable contact that can be brought into contact with or separated from the fixed contact 15 is provided inside the housing 10, so that the movable contact is brought into contact with or separated from the fixed contact 15 by the opening and closing mechanism to connect or separate an electric circuit.

The distributor plate 25 is provided with a plurality of bus bars 20. In the case of a three-phase circuit, the three busbars 20 may be arranged side by side in a parallel manner. Each bus bar 20 may be provided to the distribution board panel 25 by a bus bar mounting member (busmoving member)21 made of an insulating material, a bus bar mounting bracket 22, and a fastening screw 23.

The load-side terminal portion 19 of the housing 10 is fixed to the distribution board panel 25 by a mounting bracket 29.

The power source side terminal portion 11 is provided with a connecting member for connecting the power source side terminal, i.e., the fixed contact 15, to the bus bar 20. The connecting member may be comprised of a connector 45 and a finger assembly 40.

The connector 45 is bent in an L-shape when viewed from the side, and has a lower end connected to the fixed contact 15 and an upper end exposed to the front of the power source side terminal portion 11. At the upper end of the connector 45 is incorporated a finger assembly 40. The finger assembly 40 may be formed in a pincer-like shape to engage the bus bar 20. At this point, the finger assemblies 40 of each phase may be at different heights from one another. For example, the finger assembly of the R phase is disposed at the position of the uppermost bus bar, and the finger assembly of the T phase is disposed at the position of the lowermost bus bar.

Finger assembly 40 includes: fingers 41 formed in a pincer shape; a finger reed 42 that provides contact pressure to the finger 41; and a finger holder 43 surrounding and fixing the finger 41 and the finger spring 42.

The finger assembly 40 is exposed between the entry portions 31 formed to protrude at the front face of the base bus bar support 30.

The wiring breaker according to the embodiment of the present invention is provided with a connector 45. A connector 45 connects the finger assembly 40 and the fixed contact 15. The connector 45 may be formed substantially in an "L" shape. The finger assembly 40 is fixedly coupled to an upper portion of the connector 45, and the fixed contact 15 is fixedly coupled to a lower portion of the connector 45.

The connector 45 may be constituted by a vertical connector 46, a horizontal connector 47, and a fastening member 48 for fixing the vertical connector 46 and the horizontal connector 47.

The connector 45 may be coupled to the fixed contact 15 by a fastening member 17.

Further reference is made to the base bus support shown in fig. 7 and 8.

The circuit breaker for wiring according to an embodiment of the present invention is further provided with a base bus bar support 30 to protect a connection member between the power supply side terminal portion 11 and the bus bar 20 and to maintain insulation from the outside. The base bus support 30 is formed of an insulating material.

The base bus bar support 30 is fixedly mounted to the power supply side terminal portion 11 and covers the finger assembly 40 and the connector 45. The base bus bar support 30 may be formed in a box shape whose rear is opened as a whole.

The entry portion 31 is provided at the front face of the base bus bar support 30. The entry portion 31 may be formed in a plurality of tooth shapes to be able to be inserted between the respective bus bars 20 when viewed from the side. The teeth may be formed to be capable of meshing with the bus bar 20 and the bus bar mounting member 21.

Finger apertures 35 are formed in the front face 34 of the base bus support 30 so that the finger assemblies 40 can be exposed to the access portion 31. The finger assemblies 40 disposed at the various phases are arranged at different longitudinal and lateral positions, respectively. That is, referring to fig. 5, the finger assemblies 40 of the respective phases may be arranged at different positions from each other on the xy plane. For example, in the case of the R-phase finger assembly, the finger assembly may be disposed at the rightmost side on the x-axis and at the uppermost end on the y-axis. In the case of the T-phase finger assembly, the T-phase finger assembly may be disposed at the leftmost position on the x-axis and at the lowermost position on the y-axis.

An upper surface coupling portion 32 and a lower surface coupling portion 33 that can be coupled with the upper surface 13 and the lower surface 14 of the power supply side terminal portion 11 are formed at the upper portion and the lower portion of the base bus bar supporter 30. The upper surface bonding portion 32 and the lower surface bonding portion 33 may be formed of a plate (plate).

The lower surface coupling portion 33 of the base bus bar support 30 is formed to protrude rearward long so as to surround the lower surface 14 of the power supply side terminal portion 11. A plurality of ribs 33a are formed at the lower surface joining portion 33 to form an arc gas discharge space 36 between the lower surface 14 of the power source side terminal portion 11 and the lower surface joining portion 33. The arc gas generated at the time of the cutting is finally discharged to the outside through the discharge space 36. The rib 33a may extend from the partition wall 37.

The upper surface coupling portion 32 of the base bus bar support 30 may be formed shorter than the lower surface coupling portion 33.

A partition wall 37 is provided inside the base bus bar support 30 to insulate each phase from the other. The partition wall 37 may be formed as a longitudinal wall disposed between two sides of the base bus support 30. The partition walls 37 may be supported by a plurality of ribs formed at the periphery.

A guard 38 is formed around the finger hole 35 of the base bus bar support 30. The protector 38 is provided between the partition wall 37 and the partition wall 37 or between the partition wall 37 and the side wall 39.

The guard 38 is provided in such a manner as to surround the finger assembly 40. The protector 38 is sized to surround the finger 41, the finger spring 42, and the finger holder 43.

The guard portion 38 is formed to project rearward from the front face portion 34 of the base bus bar support 30. At this time, the protection portion 38 is formed to have a length that can overlap the exhaust duct 52 of the exhaust cover 50. Thus, the arc gas discharged through the exhaust duct 52 flows around the protection portion 38 without contacting the finger assembly 40.

A space is formed around the protection portion 38. An arc discharge space 38c is provided between the protection portion 38 and the partition wall 37. Thereby, the arc gas flows along the arc discharge space 38c to the discharge space 36 below.

The upper and lower surfaces of the protecting portion 38 may be formed to be different in length from each other.

A recess groove 38a for preventing the protection portion 38 from interfering with the connector 45 may be formed on an upper surface or a lower surface of the protection portion 38.

A rib 38b may be formed between the protector 38 and the partition wall 37 to reinforce the strength.

The circuit breaker for wiring according to an embodiment of the present invention is further provided with an exhaust cover 50. The exhaust cover 50 is coupled to the upper portion of the power supply terminal 11. The exhaust cover 50 is connected to an exhaust port of an arc chamber (not shown) of the circuit breaker and directs arc gases.

An assembly hole 51 for coupling the connector 45 and the fixed contact 15 is formed in the upper surface of the exhaust cover 50.

An exhaust duct 52 is provided on the lower surface of the exhaust cover 50 so that arc gas discharged from the exhaust port of the arc extinguishing portion can be discharged.

According to the wiring circuit breaker of the embodiment of the present invention, since the protection portion for protecting the finger assembly provided for connecting the fixed contact with the bus bar is provided, the finger assembly is protected from the arc generated at the time of disconnection.

This makes it possible to protect the wiring breaker from damage due to insulation breakdown.

Also, the flow of current is prevented from being broken.

The embodiments described above are examples for embodying the present invention, and those skilled in the art to which the present invention pertains can make various modifications and alterations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are for explaining the technical idea of the present invention, and are not intended to be limiting, and the scope of the technical idea of the present invention is not limited to the embodiments. That is, the scope of the present invention should be construed by the appended claims, and all technical ideas within the scope equivalent thereto should be construed to be included in the scope of the claims of the present invention.