Arc quenching assembly

Abstract

The present invention relates to an arc extinguishing assembly, which is constructed in such a way that, upon generation of an arc, the generated arc can be pushed in the direction away from the fixed contact by forming a temporary pressure difference between the arc guides.

Description

Technical Field

[0001] This invention relates to an arc-extinguishing assembly, and more specifically, to an arc-extinguishing assembly provided with an arc guide. Background Technology

[0002] A circuit breaker is a device that interrupts current in the event of abnormal current such as leakage, short circuit, or overcurrent in a circuit. This prevents accidents that may occur in the circuit or in electronic equipment connected to it. A circuit breaker is configured to be energized at a specific point in the circuit, allowing current to flow through it.

[0003] Existing circuit breakers are equipped with fixed contacts and movable contacts that are accessible or separable from the fixed contacts.

[0004] When a normal current is flowing, the movable contact makes contact with the fixed contact. If the movable and fixed contacts are in contact and energized, the circuit is electrically connected.

[0005] In the event of an abnormal current, the movable contact separates from the fixed contact. If the movable and fixed contacts separate, the current in the circuit is interrupted.

[0006] When the movable contact separates from the fixed contact, vapor of metal is generated as a portion of the fixed or movable contact melts and evaporates. The current flowing through the movable and fixed contacts is converted into an electric arc carrying the vapor of the metal, and the arc extends into an arc shape as the movable contact moves away from the fixed contact.

[0007] The electric arc is a flow of plasma composed of electrons and ions at high temperature and high pressure.

[0008] The generated electric arc is cooled and discharged to the outside of the arc-extinguishing assembly after undergoing an arc-extinguishing process within the assembly.

[0009] Below, refer to Figures 1 to 2 The arc extinguishing process in existing circuit breakers will be explained.

[0010] Reference Figure 1 The diagram shows an arc-extinguishing assembly 20 for extinguishing the generated electric arc.

[0011] The arc extinguishing assembly 20 is provided with a plurality of grid members 230 stacked on each other in a direction away from the fixed contact (not shown), and an exhaust section 212 for discharging the extinguished electric arc A is formed on the upper side of the plurality of grid members 230.

[0012] Reference Figure 2 The electric arc A is extinguished as it extends through a plurality of grid elements 230 and the electric arc flow channel 240.

[0013] If the movable contact (not shown) separates from the fixed contact (not shown) on the underside of the arc-extinguishing assembly 20, an electric arc A is generated as described above. The electric arc A extends along the movable contact.

[0014] Specifically, metallic gas is generated between the movable contact and the fixed contact, causing the pressure at the fixed contact to rise instantaneously, and the electric arc extends towards the grid 230 and the arc flow channel 240 due to the pressure difference.

[0015] The extended electric arc A reaches a plurality of grid members 230 and flow channels 240, and the electric arc A extends upward and is cooled as it flows along the grid members 230 and flow channels 240.

[0016] However, refer to Figure 1 The arc guides located on both sides of the path of the arc extension are excessively spaced apart.

[0017] Therefore, the following problem may occur: due to the dispersion of metallic gas generated by the separation of the movable contact from the fixed contact, the force pushing the arc A towards the grid member 230 and the arc flow channel 240 is insufficient.

[0018] Furthermore, the instantaneous pressure rise varies depending on the circuit voltage. That is, in the event of a voltage drop in the circuit, the instantaneous pressure rise may be less. The aforementioned problem occurs more frequently when a sufficient pressure differential cannot be generated due to the voltage drop. In such cases, damage to other components of the circuit breaker may occur because sufficient arc extinguishing cannot be achieved.

[0019] Prior art document (Chinese Patent Publication No. 1801418) discloses an arc-extinguishing device for eliminating electric arcs generated when a circuit is broken. Specifically, the arc-extinguishing device is provided with a grid and an arc flow channel, and the generated electric arc is extinguished as it extends along the grid and the arc flow channel.

[0020] However, in the arc extinguishing device, because the space for generating the electric arc is too wide, there may be a problem that the force pushing the electric arc towards the grid and the arc flow channel is insufficient. Summary of the Invention

[0021] The problem that the invention aims to solve

[0022] The purpose of this invention is to provide an arc-extinguishing assembly with a structure that can solve the above-mentioned problems.

[0023] Firstly, the present invention also aims to provide an arc-extinguishing assembly capable of extending the generated electric arc to the grid members and the flow channel.

[0024] In addition, the present invention aims to provide an arc-extinguishing assembly capable of pushing an electric arc generated into a flow channel.

[0025] In addition, an object of the present invention is to provide an arc-extinguishing assembly capable of pushing an electric arc generated by a grid member.

[0026] In addition, the present invention aims to provide an arc-extinguishing assembly capable of pushing the generated electric arc into the flow channel and grid member.

[0027] In addition, the present invention aims to provide an arc-extinguishing assembly capable of extinguishing an electric arc generated by pushing it into the flow channel and grid member with minimal structural changes.

[0028] Furthermore, an object of the present invention is to provide an arc-extinguishing assembly in which the generated arc can extend to the grid and the flow channel even when the voltage of the circuit drops.

[0029] Technical solutions to the problem

[0030] The present invention provides an arc-extinguishing assembly with a structure that can solve the above-mentioned problems.

[0031] The arc-extinguishing assembly of the present invention includes a pair of arc guides having inclined surfaces facing each other.

[0032] The tilted surfaces facing each other are tilted in such a way that they gradually move further away from the part where the electric arc is generated.

[0033] The distance between the inclined surfaces facing each other gradually increases as they move away from the part where the electric arc is generated.

[0034] The size of the space between the inclined surfaces facing each other gradually increases as the distance from the part where the electric arc is generated increases.

[0035] Thus, when an electric arc is generated, a pressure difference is instantaneously created in the space between the inclined surfaces that are facing each other.

[0036] The pressure in the part relatively close to where the electric arc is generated is temporarily higher than the voltage in the part relatively far away.

[0037] An arc-extinguishing assembly according to an embodiment of the present invention includes: a frame having side portions that are spaced apart by a predetermined distance and face each other, and an exhaust portion connecting the side portions to one side of the side portions; a plurality of grid members inserted between the side portions and combined with the frame to form a plate shape, and stacked together by a predetermined distance spaced apart from each other in one direction; and an arc guide member located on one side of the plurality of grid members, extending along the one direction, and respectively combined with the side portions.

[0038] In addition, the arc guide is provided with wings that protrude toward each other, and the distance between the wings gradually increases in one direction.

[0039] In addition, each of the wing portions has an inclined surface that faces each other, and each of the inclined surfaces gradually tilts toward the adjacent side portion in the direction of the first inclined surface.

[0040] In addition, each of the wing portions has inclined surfaces facing each other, and an imaginary extension line extending along the inclined direction of each of the inclined surfaces forms an acute angle with an imaginary center line passing through the center between the inclined surfaces along the same direction.

[0041] In addition, the distance between the wings gradually increases toward the exhaust section.

[0042] In addition, each of the wing portions has inclined surfaces that face each other, and each of the inclined surfaces gradually tilts toward the adjacent side portion in the direction of the exhaust portion.

[0043] In addition, the arc guide is separated from the fixed contact that generates the arc by a specified distance along the direction.

[0044] In addition, the arc extinguishing assembly also includes a flow channel that is inserted between the side portions and combined with the frame. The flow channel is located at a predetermined distance from the opposite side of the plurality of grid members, and one side of the flow channel is bent toward the fixed contact.

[0045] In addition, the length of the wing along the direction is less than the distance between the fixed contact and the curved side of the flow channel.

[0046] In addition, the grid member that is combined with the side portion includes arms on both sides, and the arms are respectively inserted into the arc guide.

[0047] In another embodiment of the present invention, the arc-extinguishing assembly includes: a frame having side portions spaced apart by a predetermined distance and facing each other, and an exhaust portion connecting the side portions on one side; a plurality of grid members inserted between the side portions and combined with the frame to form a plate shape, and stacked together by a predetermined distance spaced apart from each other in one direction; and an arc guide member located on one side of the plurality of grid members, extending along the one direction, and respectively combined with the side portions.

[0048] In addition, the arc guide is provided with wings that protrude toward each other, and the distance between the wings gradually increases toward the exhaust portion.

[0049] In addition, each of the wing sections has inclined surfaces facing each other, and an imaginary extension line extending along the inclined direction of each of the inclined surfaces forms an acute angle with an imaginary center line passing through the center between the inclined surfaces toward the exhaust section.

[0050] In addition, each of the wing sections has inclined surfaces facing each other, and each of the inclined surfaces gradually slopes toward the adjacent side portion toward the exhaust section.

[0051] In addition, the distance between the wings gradually increases in the aforementioned direction.

[0052] In addition, each of the wing portions has inclined surfaces that face each other, and each of the inclined surfaces gradually tilts toward the adjacent side portion in the direction of the exhaust portion.

[0053] In addition, the arc guide is separated from the fixed contact that generates the arc by a specified distance along the direction.

[0054] In addition, the arc extinguishing assembly also includes a flow channel that is inserted between the side portions and combined with the frame. The flow channel is located at a predetermined distance from the opposite side of the plurality of grid members, and one side of the flow channel is bent toward the fixed contact.

[0055] In addition, the length of the wing along the direction is less than the distance between the fixed contact and the curved side of the flow channel.

[0056] In addition, the grid member that is combined with the side portion includes arms on both sides, and the arms are respectively inserted into the arc guide.

[0057] In another embodiment of the present invention, the arc-extinguishing assembly includes: a frame having side portions spaced apart by a predetermined distance and facing each other, and an exhaust portion connecting the side portions on one side; a plurality of grid members inserted between the side portions and combined with the frame to form a plate shape, and stacked together by a predetermined distance spaced apart from each other in one direction; and an arc guide member located on one side of the plurality of grid members, extending along the one direction, and respectively combined with the side portions.

[0058] Additionally, the arc guide includes wings that protrude toward each other, the distance between the wings gradually increasing toward the direction and the exhaust portion.

[0059] In addition, each of the wing portions has inclined surfaces that face each other, and each of the inclined surfaces gradually tilts toward the adjacent side portion in the direction of the exhaust portion.

[0060] In addition, the arc guide is separated from the fixed contact that generates the arc by a specified distance along the direction.

[0061] In addition, the arc-extinguishing assembly also includes a flow channel, which is inserted between the side portions and combined with the frame. The flow channel is located at a predetermined distance from the opposite side of the plurality of grid members. One side of the flow channel is bent toward the fixed contact. The length of the wing in the one direction is less than the distance between the fixed contact and the bent side of the flow channel.

[0062] In addition, the distance between the two nearest parts of the wing is less than 1 / 2 of the distance between the side parts.

[0063] Invention Effects

[0064] According to the present invention, the following effects are achieved.

[0065] First, the distance between the fins increases with the proximity of the arc flow channels. This creates a temporary pressure difference when an arc is generated. As a result, the generated arc is pushed towards the arc flow channel side with relatively low pressure, thereby increasing the arc's propagation speed towards the arc flow channel and thus improving arc extinguishing performance.

[0066] Furthermore, the distance between the fins increases with the proximity of the exhaust section. This creates a temporary pressure difference when an electric arc is generated. As a result, the generated arc is pushed towards the side with relatively lower pressure. That is, the generated arc is pushed towards the grid member side, thereby increasing the arc's propagation speed towards the grid member and thus improving arc extinguishing performance.

[0067] Furthermore, the distance between the fins increases with the proximity of the arc flow channel and the exhaust section. This creates a temporary pressure difference when an arc is generated. As a result, the generated arc is pushed towards the side with relatively lower pressure. That is, the generated arc is pushed towards the grid and arc flow channel side, thereby increasing the arc's propagation speed towards the grid and arc flow channel, and thus improving arc extinguishing performance.

[0068] In addition, the arc extinguishing performance can be improved by changing the shape of the arc grid component without significant changes to the structure of the arc extinguishing assembly. Attached Figure Description

[0069] Figure 1 This is a three-dimensional diagram showing an existing arc-extinguishing assembly.

[0070] Figure 2 It shows the electric arc in Figure 1 A cross-sectional perspective view of the path extending from the arc-extinguishing assembly.

[0071] Figure 3 This is a perspective view of a circuit breaker according to an embodiment of the present invention.

[0072] Figure 4 yes Figure 3 A cross-sectional view of a circuit breaker.

[0073] Figure 5 This is a perspective view of an arc-extinguishing assembly according to an embodiment of the present invention.

[0074] Figure 6 yes Figure 5 An exploded three-dimensional view of the arc-extinguishing assembly.

[0075] Figure 7 yes Figure 6 Front and rear views of the arc guide.

[0076] Figure 8 yes Figure 6 Top and bottom views of the arc guide.

[0077] Figure 9 yes Figure 5 A cross-sectional view of the arc-extinguishing assembly.

[0078] Figure 10 It is shown Figure 6 A perspective view of another embodiment of the arc guide.

[0079] Figure 11 yes Figure 10 Front and rear views of the arc guide.

[0080] Figure 12 yes Figure 10 Top and bottom views of the arc guide.

[0081] Figure 13 yes Figure 5 A cross-sectional view of another embodiment of the arc-extinguishing assembly.

[0082] Figure 14 It is shown Figure 6 A perspective view of another embodiment of the arc guide.

[0083] Figure 15 yes Figure 14 Front and rear views of the arc guide.

[0084] Figure 16 yes Figure 14 Top and bottom views of the arc guide.

[0085] Figure 17 yes Figure 5 A cross-sectional view of another embodiment of the arc-extinguishing assembly.

[0086] Explanation of reference numerals in the attached figures

[0087] 10: Circuit breaker 11: Circuit breaker body

[0088] 11a: Accommodation space; 12a: Power supply side connection part

[0089] 12b: Load-side connection part; 13: Movable contact

[0090] 13a: Movable contact; 14: Fixed contact

[0091] 14a: Fixed contact 100: Arc extinguishing assembly

[0092] 110: Frame 111: Side Section

[0093] 1111: Snap-fit ​​fastening hole; 1113: Threaded fastening hole

[0094] 1115: Grid component fastening hole; 1117: Arc flow channel fastening hole

[0095] 1119: Arc guide fastening hole; 112: Exhaust section

[0096] 1121: Exhaust body 1121a: Buckle protrusion

[0097] 1121b: Threaded fastening groove; 1123: Insulation plate

[0098] 1125: Filter; 1127: Exhaust cover

[0099] 130: Grid component; 131: Main body of the grid component

[0100] 133: Grid component arm; 135: Grid component fastening protrusion

[0101] 140: Arc flow channel; 141: Arc flow channel fastening protrusion

[0102] 150: Arc guide 151: Wing

[0103] 151a: Arm receiving groove; 151b: Inclined surface

[0104] 153: Extension section; 155: Fastening section

[0105] 155a: Fastening hole for fastening part; 163: Fastening component for arc guide.

[0106] 250: Arc guide 251: Wing

[0107] 251a: Arm receiving groove; 251b: Inclined surface

[0108] 253: Extension part; 255: Fastening part

[0109] 255a: Fastening hole for fastening part; 350: Arc guide component

[0110] 351: Wing; 351a: Arm receiving groove

[0111] 351b: Inclined surface; 353: Extension

[0112] 355: Fastening part; 355a: Fastening hole of the fastening part. Detailed Implementation

[0113] The arc-extinguishing assembly of the present invention will now be described in detail with reference to the accompanying drawings.

[0114] In the following description, some of the constituent elements may be omitted in order to clarify the features of the present invention.

[0115] First, let's define the terms used below.

[0116] 1. Definition of terms

[0117] The term "circuit breaker" as used below refers to a device connected to a circuit that senses a leakage current, overcurrent, or short circuit in the circuit and, in the event of such a condition, disconnects the current in the circuit. In one embodiment, the circuit breaker may be an air circuit breaker.

[0118] The term "normal current" as used below refers to the current in which the circuit breaker does not trip. Specifically, it includes the current within the circuit breaker's preset current range, the current in which there is no leakage current, or the current in which there is no short circuit.

[0119] The term "abnormal current" as used below refers to the current in which the circuit breaker trips. Specifically, it includes currents exceeding the current range preset by the circuit breaker, currents in the event of leakage, and currents in the event of a short circuit.

[0120] The term "arc" as used below refers to the plasma of electrons and ions generated when movable and fixed contacts separate, which are in a state where they are in contact and generate current.

[0121] The terms "front side," "rear side," "left side," "right side," "upper side," and "lower side" mentioned below can be found in [reference needed]. Figure 3 Understanding the coordinate system shown.

[0122] 2. Description of the configuration of a circuit breaker according to an embodiment of the present invention

[0123] Below, refer to Figure 3 and Figure 4 The configuration of a circuit breaker according to an embodiment of the present invention will be described.

[0124] Reference Figure 3 and Figure 4 This shows a circuit breaker 10 that disconnects current when an abnormal current is generated.

[0125] The circuit breaker 10 is provided with a circuit breaker body 11, and an upwardly opening receiving space 11a is formed inside the circuit breaker body 11 (see reference). Figure 4 A power supply side connection portion 12a, which is energized and connected to the power supply side, and a load side connection portion 12b, which is energized and connected to the load side, are formed on the front side of the circuit breaker body portion 11.

[0126] Reference Figure 4 A fixed contact 13 and a movable contact 14 are provided in the receiving space 11a of the circuit breaker body 11. The fixed contact 13 and the movable contact 14 are configured to disconnect or energize the power supply side connection 12a and the load side connection 12b.

[0127] A fixed contact 13a is provided in the fixed contact 13, and a movable contact 14a is provided in the movable contact 14. When a normal current flows in the circuit, the fixed contact 13a and the movable contact 14a are in contact with each other, thereby allowing current to flow between the power supply side connection 12a and the load side connection 12b.

[0128] When an abnormal current flows in the circuit, the movable contact 14 rotates by a predetermined angle in the direction of separation from the fixed contact 13. As a result, the fixed contact 13a and the movable contact 14a separate from each other, thereby disconnecting the current between the power supply side connection 12a and the load side connection 12b.

[0129] Since the structure of the movable contact 14 separating from the fixed contact 13 by rotation is prior art, its structure is omitted.

[0130] When the movable contact 14a and the fixed contact 13a are separated, an electric arc is generated between them. At this time, the electric arc is a plasma of high-temperature electrons and ions; if it is not extinguished quickly, the structure constituting the circuit breaker may be damaged. Therefore, an arc-extinguishing assembly 100 for extinguishing the electric arc is provided above the fixed contact 13a and the movable contact 14a.

[0131] The arc extinguishing assembly 100 is inserted into the open side of the receiving space 11a of the circuit breaker body 11 and covers the open portion of the receiving space 11a.

[0132] The generated electric arc is extinguished in the arc-extinguishing assembly 100 and then discharged to the outside of the circuit breaker 10 through the exhaust section 112 of the arc-extinguishing assembly 100. The electric arc extends as it flows along the grid member 130 and the arc flow channel 140 of the arc-extinguishing assembly 100. Therefore, it is preferable to move the electric arc rapidly toward the grid member 130 and / or the arc flow channel 140 to quickly extinguish the arc.

[0133] 3. Description of an embodiment of the arc-quenching assembly of the present invention

[0134] Below, refer to Figure 5 and Figure 6 An embodiment of the arc-extinguishing assembly 100 of the present invention will be described.

[0135] Reference Figure 5 and Figure 6 The image shows the arc-extinguishing assembly 100 in both a combined and a decomposed state.

[0136] The arc-extinguishing assembly 100 is housed within the receiving space 11a of the circuit breaker 10 and is located adjacent to the upper side of the fixed contact 13a and the movable contact 14a. An electric arc is generated on the lower side of the arc-extinguishing assembly 100 and undergoes an arc-extinguishing process within the assembly, after which it is discharged to the outside of the circuit breaker 10 through the exhaust portion 112 of the assembly. The arc-extinguishing assembly 100 includes a frame 110, a grid member 130, an arc flow channel 140, and an arc guide 150.

[0137] The frame 110 includes an exhaust section 112 and a pair of side sections 111 that are coupled to the exhaust section 112.

[0138] (1) Explanation of exhaust section 112

[0139] First, the exhaust section 112 will be explained.

[0140] The exhaust section 112 includes an exhaust hood 1121, an insulating plate 1123, a filter 1125, and an exhaust cover 1127.

[0141] A pair of side portions 111, described later, are respectively attached to the left and right sides of the exhaust hood 1121. A receiving portion (not marked) for accommodating the insulating plate 1123 and the filter 1125 is recessed in the center of the upper side of the exhaust hood 1121. A plurality of exhaust holes (not marked) in the shape of through holes are formed in the insulating plate 1123.

[0142] An exhaust cover 1127 is attached to the upper side of the exhaust cover 1121, and a plurality of gas outlets (not marked) in the shape of a hole are formed in the center of the exhaust cover 1127.

[0143] As described above, the exhaust section 112 includes, from bottom to top, an exhaust port, an insulating plate 1123, a filter 1125, and a gas outlet. Therefore, the metallic gas flowing in from the exhaust port passes through the insulating plate 1123 and the filter 1125, and is then discharged to the outside of the circuit breaker 10 via the gas outlet. In other words, the exhaust section 112 functions as a passage for discharging metallic gas to the outside of the circuit breaker 10.

[0144] Furthermore, the arc-extinguishing assembly 100 is connected to the circuit breaker body 11 via the venting section 112. The process of connecting the venting section to the circuit breaker housing is as follows.

[0145] The vent cover 1127 has through-hole-shaped fastening holes (not marked) on its front and rear sides. With the vent cover 1127 covering the open portion of the receiving space 11a of the circuit breaker 10, the fastening member (not shown) passes through the fastening hole and is attached to the circuit breaker body 11. Thus, the arc-extinguishing assembly 100 is attached to the circuit breaker body 11.

[0146] Furthermore, the exhaust section 112 functions as a means of increasing pressure inside the arc-extinguishing assembly 100. Specifically, since the exhaust section 112 covers the opening of the accommodating space 11a, the pressure inside the arc-extinguishing assembly 100 may rise instantaneously when metallic gas is generated. As a result, a temporary pressure difference is created between the inside of the arc-extinguishing assembly 100 and the outside of the circuit breaker 10, allowing the metallic gas to move toward the exhaust port of the exhaust section 112.

[0147] (2) Explanation of side part 111

[0148] Next, the side portion 111 will be described.

[0149] A pair of plates are provided on the side portion 111.

[0150] The side portions 111 are located facing each other, and the grid member 130 and the arc flow channel 140, described later, are disposed between and combined with the side portions 111.

[0151] A plurality of through-hole-shaped grid fastening holes 1115 and arc flow channel fastening holes 1117 are formed in the center of the side portion 111. Grid fastening protrusions 135 and arc flow channel fastening protrusions 141 (described later) are respectively inserted into the grid fastening holes 1115 and the arc flow channel fastening holes 1117.

[0152] Here, the grid fastening hole 1115 and the arc flow channel fastening hole 1117 are formed with dimensions corresponding to or slightly smaller than the grid fastening protrusion 135 and the arc flow channel fastening protrusion 141. Thus, the grid fastening protrusion 141 and the arc flow channel fastening protrusion 135 are pressed into the grid fastening hole 1115 and the arc flow channel fastening hole 1117, and the side portion 111 can be coupled with the grid 130 and the arc flow channel 140.

[0153] In the illustrated embodiment, the grid fastening hole 1115 and the arc flow channel fastening hole 1117 are formed as quadrilaterals, but their shapes may vary depending on the shapes of the grid fastening protrusion 135 and the arc flow channel fastening protrusion 141.

[0154] Furthermore, an arc guide 150, described later, is attached to each side portion 111. An arc guide fastening hole 1119, in the shape of a through hole, is formed on the lower side of the side portion 111 for engaging with the arc guide 150. A plurality of arc guide fastening holes 1119 may be formed.

[0155] The arc guide fastening member 161 passes through the arc guide 150 and engages with the arc guide fastening hole 1119. The arc guide 150 is engaged with the side portion 111 by the fastening force of the arc guide fastening member 161 and the arc guide fastening hole 1119.

[0156] In one embodiment, the arc guide fastening member 161 may be composed of bolts and nuts. Alternatively, in another embodiment, the arc guide fastening member may be a rivet.

[0157] An exhaust section 112, described later, may be attached to the upper side of the side portion 111 and between the side portions 111.

[0158] On the upper side of the side portion 111, there are a snap-fit ​​hole 1111 and a threaded fastening hole 1113 in the shape of a through hole for engaging with the exhaust portion 112.

[0159] In addition, the exhaust cover 1121 provided on the exhaust section 112 has a snap-fit ​​protrusion 1121a and a threaded engagement groove 1121b for engaging with the side section 111.

[0160] In order to engage with the exhaust section 112, a pair of side portions 111 slide toward the left and right sides of the exhaust section 112. If the side portions 111 move, the snap protrusions 1121a protruding from the left and right sides of the exhaust section cover 1121 are inserted into and engaged with the snap fastening holes 1111.

[0161] Here, the snap-fit ​​protrusion 1121a is formed at an angle in the insertion direction of the side portion 111. As a result, the snap-fit ​​protrusion 1121a can be easily inserted into the snap-fit ​​hole 1111. In addition, when the snap-fit ​​protrusion 1121a is inserted into the snap-fit ​​hole 1111, the side portion 111 will not move arbitrarily towards the lower side of the exhaust cover 1121.

[0162] In the illustrated embodiment, the snap fastening hole 1111 is formed as a quadrilateral, but its shape may vary depending on the shape of the snap protrusion 1121a.

[0163] Furthermore, with the side portion 111 engaged with the exhaust cover 1121, a fastening screw (not shown) passes through the threaded fastening hole 1113 and engages with the threaded fastening groove 1121b. This allows for a more secure fastening of the exhaust portion 112 and the side portion 111.

[0164] (3) Explanation of grid component 130 and arc flow channel 140

[0165] Next, the grid component 130 will be described.

[0166] The grid members 130 are formed in the shape of plates and are stacked in a plurality of them at predetermined intervals along a direction away from the fixed contact. Specifically, the grid members 130 are stacked in a plurality of them at predetermined distances from the front side to the rear side.

[0167] The grid member 130 is provided with a grid member main body 131 and arm portions 133 extending downward from both sides of the grid member main body 131. Specifically, the arm portions 133 extend downward from the left and right sides of the grid member main body 131. The lower ends of the arm portions 133 are respectively inserted into the arm receiving grooves 151a of the arc guide member 150, which will be described later.

[0168] Since the lower end of the arm 133 is surrounded by the arm receiving groove 151a, the electric arc can move upward without stopping in the arm 133.

[0169] Furthermore, grid fastening protrusions 135 are formed on both sides of the grid member 130, specifically on the left and right sides of the grid member 130. The grid fastening protrusions 135 protruding to both sides are inserted into the grid fastening holes 1115, thereby fixing the grid member 130 between a pair of side portions.

[0170] The grid element 130 can be formed of any material capable of exerting electromagnetic attraction on the electric arc. In one embodiment, the grid element 130 can be formed of iron (Fe).

[0171] The electric arc extends and moves among a plurality of grid elements 130. As a result, the arc voltage increases, and the arc is cooled.

[0172] Next, the arc flow channel 140 will be described.

[0173] The arc flow channel 140 is formed in the shape of a plate and is spaced back by a predetermined distance from the plurality of grid members 130.

[0174] The electric arc extends to the lower end of the arc flow channel 140 and flows along the arc flow channel 140. If the electric arc cannot reach the arc flow channel 140, the arc extinguishing performance may decrease. Considering this, it is preferable to reduce the distance between the location where the electric arc occurs and the arc flow channel 140.

[0175] For this purpose, the lower end of the arc flow channel 140 is bent toward the fixed contact 13a. The bent lower end is located on the lower side of the rearmost grid member 130 among the plurality of grid members 130. Through the bent structure of the arc flow channel 140, the distance between the lower end of the arc flow channel 140 and the fixed contact 13a is shortened.

[0176] The arc flow channel 140 can be formed of any material capable of exerting electromagnetic attraction on the arc. In one embodiment, the arc flow channel can be formed of iron (Fe) material.

[0177] (4) Description of Arc Guide 150

[0178] Next, the arc guide 150 will be described.

[0179] A pair of arc guides 150 are provided, and are respectively coupled to a pair of side portions 111 on the underside of the grid member 130.

[0180] The arc guide 150 is formed of an insulating material and extends along the stacking direction of the grid member 130. That is, the arc guide 150 extends in a direction away from the fixed contact 13a.

[0181] The arc guide 150 includes a wing 151, an extension 153, and a fastening part 155.

[0182] The wing 151 is formed to extend rearward from the lower side of the foremost grid member 130. The extension 153 is formed to extend from the wing 151 to the lower side of the rearmost grid member. The fastening part 155 is formed to extend downward from the wing 151 and the extension 153.

[0183] The wing 151 and the extension 153 suppress the decrease in arc extinguishing efficiency by accommodating the arm 133 of the grid member 130.

[0184] Specifically, arm receiving grooves 151a, which open to the upper and side portions 111, are formed in the wing portion 151 and the extension portion 153, and are formed along the stacking direction of the grid member 130. The openings facing the side portions 111 are blocked by the engagement with the side portions 111, and the lower end of the arm portion 133 is inserted into the upper opening of the arm receiving groove 151a.

[0185] The arm receiving groove 151a can be formed in multiple parts by being divided so that the arms 133 can be inserted separately, or it can be integrally formed so that multiple arms 133 can be inserted.

[0186] In one embodiment, the arm receiving groove 151a formed on the wing 151 is formed into a plurality of segments, while the arm receiving groove formed on the extension 153 is formed as a single unit.

[0187] The lower end of the inserted arm 133 is surrounded by an arc guide 150 made of insulating material, thereby causing the generated arc to move toward the arm 133 and suppressing the decrease in arc extinguishing efficiency.

[0188] A pair of wings 151 are formed protruding toward each other, thereby reducing the size of the space formed between the wings 151. Therefore, it is possible to suppress the dispersion of metallic gas generated at the fixed contact when an abnormal current is generated. That is, it is possible to suppress the dispersion of metallic gas generated adjacent to the front and lower sides of the wings 151.

[0189] Furthermore, the pair of wings 151 can be configured such that the distance between them gradually increases from the front side to the rear side. As a result, the size of the space between the pair of wings 151 gradually increases from the front side to the rear side.

[0190] In one embodiment, a pair of wings 151 are provided with inclined surfaces facing each other, and each inclined surface is formed to be inclined from the front side to the rear side towards the adjacent side portion.

[0191] In one embodiment, a pair of wings 151 have a quadrilateral cross-sectional shape, the lengths of the left and right sides of the quadrilateral gradually decreasing from the front side to the rear side. As a result, the size of the space between the two inclined surfaces gradually increases from the front side to the rear side, and a pressure difference is generated between the front and rear sides when metallic gas is generated at the fixed contact.

[0192] Furthermore, the metallic gas is pushed rearward by the pressure difference. This increases the length and speed of the arc's extension from the front to the rear. A more detailed explanation of this will follow later.

[0193] The fastening part serves to connect the arc guide 150 and the side part.

[0194] Specifically, the fastening part 155 extends from the lower side of the wing part 151 and the extension part 153, and a fastening hole 155a in the shape of a through hole is formed in the fastening part 155 at a position corresponding to the fastening hole 1119 of the arc guide.

[0195] With the fastening portion 155 and the side portion 111 connected to each other and the arc guide fastening hole 1119 and the fastening portion fastening hole 155a aligned, the arc guide fastening member 161 passes through the fastening portion fastening hole 155a and the arc guide fastening hole 1119. Thus, the arc guide 150 can be combined with the side portion 111.

[0196] Preferably, the portion of the arc guide fastening member 161 exposed towards the arc guide side is insulated. This prevents the arc from moving through the arc guide fastening member 161.

[0197] (5) Explanation of the distance between the arc guides 150 and the inclined surface of the arc guides 150

[0198] Below, refer to Figures 7 to 9 The distance between the arc guides 150 and the shape of the inclined surface 151b of the arc guides 150 in this embodiment will be described in detail.

[0199] Figure 7 yes Figure 6 Front and rear views of the arc guide 150. Figure 8 yes Figure 6 Top and rear views of the arc guide 150. Figure 9 yes Figure 5 A cross-sectional view of the arc-extinguishing assembly 100.

[0200] Figure 7 (a) shows the forward end of wing 151. Figure 7 (b) shows the rear end of wing 151.

[0201] The fixed contact 13a is located on the lower side of the front end of the wing 151. If the movable contact 14a separates from the fixed contact 13a due to sensing an abnormal current, metallic gas is generated instantaneously, and the generated metallic gas flows through the electric arc.

[0202] If metallic gas is generated, the pressure in the part where the metallic gas is generated increases instantaneously. As a result, the metallic gas rises towards the exhaust section 112 of the arc-extinguishing assembly 100 due to the pressure difference. Thus, the electric arc flowing through the metallic gas rises and extends in an arc shape.

[0203] Here, the electric arc moves through the space between the arc guides 150 to the grid members 130 and the arc flow channel 140, and is discharged to the outside of the circuit breaker 10 after the arc extinguishing process in the grid members 130 and the arc flow channel 140.

[0204] On the other hand, as described above, since an electric arc is a flow of electrons under high temperature and pressure, it is preferable to discharge the arc to the outside of the circuit breaker 10 in a short time. For this purpose, it is preferable to allow the generated arc to extend rapidly to the arc flow path 140 located furthest from the fixed contact 13a. Furthermore, it is preferable that the generated arc extends rapidly from the fixed contact 13a towards the exhaust portion 112.

[0205] Since the wings 151 of the pair of arc guides 150 in this embodiment protrude toward each other, the size of the space between the wings 151 is reduced. This suppresses the dispersion of metallic gas generated at the fixed contact 13a between the wings 151. As a result, the dispersion of the arc between the wings 151 is suppressed, and the generated arc can rapidly extend toward the grid member 130 in the space between the wings 151.

[0206] In addition, each of the pair of wings 151 is provided with an inclined surface 151b facing each other. The specific shape of the inclined surface 151b is as follows.

[0207] That is, the front and rear ends of a pair of wings 151 are connected by inclined surfaces 151b, and the distance D1 between the front ends of the pair of wings 151 is less than the distance D2 between the rear ends. As a result, the distance between the inclined surfaces 151b of the pair of wings 151 gradually increases from the front side to the rear side.

[0208] That is, the size of the space between the inclined surfaces 151b of the pair of wings 151 gradually increases from the front side to the rear side. In other words, the size of the space between the inclined surfaces 151b of the pair of wings 151 increases as it moves away from the fixed contact 13a in the stacking direction of the grid member 130. As a result, when an electric arc is generated, a temporary pressure difference is generated between the space between the front ends and the space between the rear ends of the wings 151.

[0209] The metallic gas is pushed from the front end of the wing 151, where the pressure is relatively high, to the rear end, where the pressure is relatively low. That is, due to the pressure difference, the electric arc is pushed from the front end of the wing 151 to the rear end.

[0210] Through the wing 151 structure described above, the electric arc can extend rapidly toward the electric arc flow channel 140.

[0211] Specifically, the metallic gas is pushed from the front end of the wing 151 to the rear end. In other words, the metallic gas is pushed away from the fixed contact along the stacking direction of the grid members. That is, the metallic gas is pushed towards the arc flow channel. As a result, the arc can be rapidly extended to the arc flow channel located on the rear side of the wing 151. Consequently, the arc extension distance can be increased along the stacking direction of the grid members 130.

[0212] In other words, due to the temporary pressure difference in the space between the wing portions 151, the electric arc is pushed towards the arc flow channel 140, thus allowing the electric arc to rapidly extend into the arc flow channel 140. (Refer to...) Figure 9 This shows the direction in which the electric arc is propelled by a temporary pressure difference in the arc guide 150.

[0213] When the voltage in the circuit drops, the instantaneous pressure increase generated when the fixed contact 13a and the movable contact 14a separate is relatively reduced. As a result, the arc cannot reach the arc flow channel 140, thus reducing the arc extinguishing performance.

[0214] However, when using the arc guide 150 with the above-described structure, the reduction in pressure increase caused by a voltage drop in the circuit can be compensated for. Therefore, even when the circuit voltage drops, the arc can smoothly extend into the arc flow channel 140.

[0215] The inclined surface 151b of the arc guide 150 in this embodiment will now be described in detail.

[0216] Figure 8 (a) shows the upper side of wing 151. Figure 8 (b) shows the lower side of wing 151.

[0217] The inclined surface 151b of the wing portion 151 is formed to be inclined toward the adjacent side portion 111 as it moves away from the fixed contact 13a in the stacking direction of the grid member 130. In other words, the inclined surface 151b of the wing portion 151 is formed to be inclined gradually toward the adjacent side portion 111 from the front to the rear.

[0218] Reference Figure 8 The diagram shows imaginary extension lines L1 extending along the tilt direction of each tilted surface 151b, and an imaginary center line C1 passing through the center between the two tilted surfaces 151b along the stacking direction of the grid member 130. Here, each extension line L1 forms an acute angle with the center line C1.

[0219] Through the structure of the inclined surface 151b described above, the distance between the inclined surfaces 151b of the pair of wings 151 gradually increases from the front side to the rear side. That is, the size of the space between the inclined surfaces 151b of the pair of wings 151 gradually increases from the front side to the rear side.

[0220] As a result, a pressure difference is generated between the space between the front and rear ends of the wing 151 when an electric arc is generated. Consequently, the pressure in the space between the wing 151 gradually decreases from front to rear when an electric arc is generated. In addition, the fluid between the wing 151 flows from the front, where the pressure is relatively high, to the rear, where the pressure is relatively low, when an electric arc is generated.

[0221] That is, the metallic gas is pushed from the front end to the rear end of the wing 151 due to the pressure difference. That is, the electric arc is pushed from the front end to the rear end of the wing 151 due to the pressure difference.

[0222] The explanation of the effects of this structure is the same as that described above, therefore the aforementioned explanation is cited.

[0223] The inclined structure of the wing 151 is for pushing the electric arc toward the lower end of the arc flow channel 140. Therefore, it is preferable that the length of the wing 151 in the front-rear direction is less than the distance between the fixed contact 13a and the lower end of the arc flow channel 140.

[0224] In one embodiment, the lower end of the arc flow channel 140 is separated from the rear end of the wing 151 by a predetermined distance.

[0225] In order to prevent excessive dispersion of metallic gas when an electric arc is generated, a predetermined distance may be separated between a portion of a pair of wings 151 and the portion closest to the fixed contact 13a.

[0226] In one embodiment, when an abnormal current is generated, the distance between a portion of a pair of wings 151 and the portion closest to the fixed contact 13a may be less than half the distance between a pair of side portions 111.

[0227] In one embodiment, the distance between the nearest portions of a pair of wings 151 may be less than half the distance between a pair of side portions 111.

[0228] However, if the distance between a portion of a pair of wings 151 and the portion closest to the fixed contact 13a is too close, interference with the movable contact 14 may occur.

[0229] With this in mind, preferably, the distance between the closest portions of a pair of wings 151 is such that it does not interfere with the movable contact 14.

[0230] 4. Description of another embodiment of the arc-quenching assembly 100 of the present invention

[0231] Below, refer to Figures 10 to 13 Another embodiment of the arc-extinguishing assembly 100 of the present invention will be described.

[0232] In this embodiment of the arc-extinguishing assembly, apart from the arc guide 250, the remaining configuration is the same as that of the arc-extinguishing assembly 100 of an embodiment of the present invention. Therefore, the modified arc guide 250 will be described in detail, while the description of the remaining configuration refers to the foregoing description.

[0233] Furthermore, compared to the aforementioned arc guide 150, the arc guide 250 of this embodiment has the same configuration except for the inclined surface 251b. Therefore, the description of the remaining configuration except for the inclined surface 251b refers to the description of the aforementioned arc guide 150.

[0234] The following section focuses on the modified inclined surface 251b.

[0235] Reference Figures 10 to 12 A pair of wings 251 have inclined surfaces 251b facing each other.

[0236] In one embodiment, the pair of wings 251 may have a trapezoidal cross-section with the upper portion cut off in a right-angled triangle. Each inclined surface 251b may be inclined from the lower side to the upper side towards the adjacent side surface 111. In other words, each inclined surface 251b is formed to be inclined towards the adjacent side surface 111 as it approaches the exhaust portion 112.

[0237] That is, the imaginary extension line L2 extending along the tilt direction of each tilting surface 251b forms an acute angle with the imaginary center line C2 passing through the center between the tilting surfaces toward the exhaust section. As a result, the distance between the pair of wings 251 gradually increases from the lower side to the upper side.

[0238] Specifically, the lower ends of a pair of wings 251 are separated by a first distance D1, and the upper ends are separated by a second distance D2. Here, the value of the second distance D2 can be greater than the value of the first distance D1. That is, the distance between a pair of wings 251 can gradually increase from the lower ends to the upper ends.

[0239] The size of the space between the pair of wings 251 gradually increases from the lower side to the upper side. As a result, when metallic gas is generated at the fixed contact 13a, a temporary pressure difference is generated between the lower and upper sides of the space between the two inclined surfaces 251b.

[0240] Furthermore, the metallic gas is pushed from the lower end, where the pressure is relatively high, to the upper end, where the pressure is relatively low. This increases the speed at which the electric arc extends from the lower to the upper side. Figure 13 This illustrates the direction in which the electric arc is propelled by the temporary pressure difference generated between the arc guides 250. As a result, the arc extends more rapidly to the grid members 130, thereby improving arc extinguishing performance.

[0241] 5. Description of another embodiment of the arc-quenching assembly 100 of the present invention

[0242] Below, refer to Figures 14 to 17 Another embodiment of the arc-extinguishing assembly 100 of the present invention will be described.

[0243] In the arc-extinguishing assembly of this embodiment, the remaining configuration, except for the arc guide 350, is the same as that of the arc-extinguishing assembly 100 of an embodiment of the present invention. Therefore, the modified arc guide 350 will be described in detail, and the description of the remaining configuration refers to the foregoing description.

[0244] Furthermore, compared to the aforementioned arc guide 150, the arc guide 350 of this embodiment has the same configuration as the arc guide 150 except for the inclined surface 351b. Therefore, the description of the remaining configuration except for the inclined surface 351b refers to the description of the configuration of the aforementioned arc guide 150.

[0245] The following section focuses on the modified inclined surface 351b.

[0246] Reference Figures 14 to 16 A pair of wings 351 have inclined surfaces 351b facing each other.

[0247] In one embodiment, the pair of wings 351 may have a trapezoidal cross section with the upper part cut off in a right-angled triangle. The pair of wings 351 are respectively provided with inclined surfaces 351b facing each other, and each inclined surface 351b is formed to gradually incline towards the adjacent side surface 111 from the front side to the rear side and from the bottom side to the top side.

[0248] In other words, the inclined surfaces 351b facing each other are formed to gradually slope toward the adjacent side portion 111 as they move away from the fixed contact 13a and as they approach the exhaust portion 112. As a result, the distance between the inclined surfaces 351b gradually increases from the front side to the rear side and from the bottom side to the top side.

[0249] Reference Figure 15 (a) shows the leading ends of a pair of wings 151. The distance between the leading ends of the pair of wings 151 gradually increases from the lower side to the upper side. Specifically, the pair of wings 151 are separated by a predetermined first distance D11 at their lower ends (first portions), and by a predetermined second distance D21, which is larger than the first distance D11, at any portion between the lower and upper ends (second portions).

[0250] Reference Figure 15 (b) shows the rear ends of a pair of wings 351. The distance between the pair of wings 351 gradually increases from front to rear.

[0251] In the first part, the distance between a pair of wings 351 gradually increases from front to rear. The distance between the pair of wings 351 gradually increases rearward from a first distance D11, and at the rear end is a predetermined third distance D12 that is larger than the first distance D11.

[0252] In the second part, the distance between a pair of wings 351 gradually increases from front to rear. The distance between the pair of wings 351 gradually increases rearward from a second distance D21, and at the rear end is a predetermined fourth distance D22 that is larger than the second distance D11.

[0253] That is, as described above, the distance between the inclined surfaces 351b gradually increases from the front side to the rear side and from the bottom side to the top side. Consequently, the size of the space between the two inclined surfaces 351b gradually increases from the front side to the rear side and from the bottom side to the top side, respectively. As a result, when an electric arc is generated at the fixed contact 13a, a temporary pressure difference is generated in the space between the wings 351.

[0254] Furthermore, the pressure on the front side temporarily increases compared to the pressure on the rear side, and the pressure on the lower side temporarily increases compared to the pressure on the upper side. As a result, the arc is pushed towards the rear and upper sides due to the pressure difference. This increases the arc's extension length and speed from the front to the rear side. Additionally, it increases the arc's extension speed from the lower to the upper side. (See reference...) Figure 17 This shows the direction in which the electric arc is propelled by the pressure difference generated between a pair of wings 351.

[0255] Because the speed at which the electric arc extends backward and upward is increased, the arc extends more rapidly to the grid member 130 and the arc flow channel 140. As a result, the arc extinguishing performance is improved.

[0256] Furthermore, when the circuit voltage drops, the instantaneous pressure increase generated when the fixed contact 13a and the movable contact 14a separate can be relatively reduced. As a result, the arc cannot reach the arc flow channel 140, and the arc extinguishing performance may decrease.

[0257] However, when using the arc guide 350 with the above-described structure, the reduction in pressure increase caused by a voltage drop in the circuit can be compensated. Therefore, even when the circuit voltage drops, the arc can smoothly extend into the arc flow channel 140.

[0258] The preferred embodiments of the present invention have been described above. However, those skilled in the art will understand that various modifications and changes can be made to the present invention within the spirit and scope of the invention as set forth in the claims.

[0259] Industrial applicability

[0260] This invention relates to arc-extinguishing assemblies, and can provide arc-extinguishing assemblies provided with arc guides, thus having industrial applicability.

Claims

1. An arc-extinguishing assembly, wherein, include: The frame is provided with side portions that are spaced apart by a predetermined distance and face each other, and an exhaust portion that connects the side portions to each other on one side of the side portions; A plurality of grid members are inserted between the side portions and combined with the frame to form a plate shape, stacked together at a predetermined distance from each other in one direction; and A plurality of arc guides are located on one side of the plurality of grid members, extend along the direction, and are respectively engaged with the side portion; Each of the plurality of said arc guides comprises: Wings, protruding toward each other, extending in the said direction; and An extension extends from the wing along the direction; The distance between the wings gradually increases in the said direction. Each of the said wings includes an inclined surface facing each other and extending obliquely from one end of the wing to the other end in said one direction; The wing portion is formed with a plurality of arm receiving grooves that respectively accommodate a portion of one of the plurality of grid members; An arm receiving groove is formed in the extension to accommodate the remaining grid members among the plurality of grid members and is formed integrally.

2. The arc-extinguishing assembly according to claim 1, wherein, Each of the inclined surfaces gradually tilts toward the adjacent side portion in the direction of the stated inclination.

3. The arc-extinguishing assembly according to claim 1, wherein, An imaginary extension line extending along the inclination direction of each of the inclined surfaces forms an acute angle with an imaginary center line passing through the center between the inclined surfaces along the same direction.

4. The arc-extinguishing assembly according to claim 1, wherein, The arc guide and the fixed contact that generates the arc are separated by a predetermined distance along the said one direction. The arc-extinguishing assembly also includes a flow channel. The flow channel is inserted between the side portions and combined with the frame. The flow channel is located at a predetermined distance from the opposite side of the plurality of grid members, and one side of the flow channel is bent toward the fixed contact.

5. The arc-extinguishing assembly according to claim 4, wherein, The length of the wing along the direction is less than the distance between the fixed contact and the curved side of the flow channel.

6. The arc-extinguishing assembly according to claim 1, wherein, The grid member, which is combined with the side portion, includes arms on both sides. The arm is inserted into the arc guide.

7. An arc-extinguishing assembly, wherein, include: The frame is provided with side portions that are spaced apart by a predetermined distance and face each other, and an exhaust portion that connects the side portions to each other on one side of the side portions; A plurality of grid members are inserted between the side portions and combined with the frame to form a plate shape, stacked together at a predetermined distance from each other in one direction; and A plurality of arc guides are located on one side of the plurality of grid members, extend along the direction, accommodate a portion of the plurality of grid members, and are respectively coupled to the side portion; Each of the plurality of said arc guides comprises: Wings, protruding toward each other, extending in the said direction; and An extension extends from the wing along the direction; The distance between the wings gradually increases toward the exhaust section; The wing portion is formed with a plurality of arm receiving grooves that respectively accommodate a portion of one of the plurality of grid members; An arm receiving groove is formed in the extension to accommodate the remaining grid members among the plurality of grid members and is formed integrally.

8. The arc-extinguishing assembly according to claim 7, wherein, Each of the aforementioned wings includes inclined surfaces facing each other. An imaginary extension line extending along the inclination direction of each of the inclined surfaces forms an acute angle with an imaginary center line passing through the center between the inclined surfaces toward the exhaust portion.

9. The arc-extinguishing assembly according to claim 7, wherein, Each of the aforementioned wings includes inclined surfaces facing each other. Each of the inclined surfaces gradually slopes toward the adjacent side portion of the exhaust section.

10. The arc-extinguishing assembly according to claim 7, wherein, The arc guide and the fixed contact that generates the arc are separated by a predetermined distance along the said one direction. The arc-extinguishing assembly also includes a flow channel. The flow channel is inserted between the side portions and combined with the frame. The flow channel is located at a predetermined distance from the opposite side of the plurality of grid members, and one side of the flow channel is bent toward the fixed contact.

11. The arc-extinguishing assembly according to claim 10, wherein, The length of the wing along the direction is less than the distance between the fixed contact and the curved side of the flow channel.

12. The arc-extinguishing assembly according to claim 7, wherein, The grid member, which is combined with the side portion, includes arms on both sides. The arm is inserted into the arc guide.

13. An arc-extinguishing assembly, wherein, include: The frame is provided with side portions that are spaced apart by a predetermined distance and face each other, and an exhaust portion that connects the side portions to each other on one side of the side portions; A plurality of grid members are inserted between the side portions and combined with the frame to form a plate shape, stacked together at a predetermined distance from each other in one direction; and A plurality of arc guides are located on one side of the plurality of grid members, extend along the direction, and are respectively engaged with the side portion; Each of the plurality of said arc guides comprises: Wings, protruding toward each other, extending in the said direction; and An extension extends from the wing along the direction; The distance between the wings gradually increases toward the said direction and the exhaust section. Each of the said wings includes an inclined surface facing each other and extending obliquely from one end of the wing to the other end in said one direction; The wing portion is formed with a plurality of arm receiving grooves that respectively accommodate a portion of one of the plurality of grid members; An arm receiving groove is formed in the extension to accommodate the remaining grid members among the plurality of grid members and is formed integrally.

14. The arc-extinguishing assembly according to claim 13, wherein, Each of the inclined surfaces gradually slopes toward the adjacent side portion of the exhaust section.

15. The arc-extinguishing assembly according to claim 13, wherein, The arc guide and the fixed contact that generates the arc are separated by a predetermined distance along the said one direction. The arc-extinguishing assembly also includes a flow channel. The flow channel is inserted between the side portions and engaged with the frame. The flow channel is located at a predetermined distance from the opposite side of the plurality of grid members, and one side of the flow channel is bent towards the fixed contact. The length of the wing along the direction is less than the distance between the fixed contact and the curved side of the flow channel.

16. The arc-extinguishing assembly according to claim 13, wherein, The nearest distance between the wings is less than 1 / 2 of the distance between the side portions.

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