Air circuit breaker having insulation member

Abstract

Disclosed is an air circuit breaker that has an insulation member. The air circuit breaker according to an aspect of the present invention comprises: a main body; an operating portion which is provided in the inner space of the main body and generates an arc when a mover is operated relative to a stator; a plurality of arc extinguishers which are installed above the operating portion and are arranged adjacent to each other to extinguish an arc; and insulation members which are arranged at both sides of the arc extinguishers in a second direction and, when an arc extinguishing gas generated by the arc extinguishers is discharged, the end portions of which are unfolded due to pressure so as to block the movement space of the arc extinguishing gas between an arc extinguisher and a neighboring arc extinguisher.

Description

Air circuit breaker with insulating material

[0001] The present invention relates to an air circuit breaker, and more particularly, to an air circuit breaker having an insulating member capable of improving arc-extinguishing performance.

[0002] In general, an air circuit breaker (ACB) is a device that uses air as an arcing medium to open and close devices that receive power in a power transmission and distribution system or line, or to cut off the current in the event of a safety accident such as overload or short circuit, thereby protecting the power system and load equipment.

[0003] These air circuit breakers are equipped with a movable part and a stator that comes into contact with the movable part. When the movable part comes into contact with the stator, current flows through the line. When a large current flows due to a safety accident on the line, the movable part is separated from the stator and the current in the line is cut off.

[0004] Meanwhile, the air circuit breaker must be configured to cut off the fault current within a short time in the event of a short circuit to ensure user safety and system integrity.

[0005] At this time, the current flowing between the movable and stator parts inside the circuit breaker does not disappear immediately, but changes into an arc shape and extends.

[0006] An arc can be defined as a flow of high-temperature, high-pressure electrons. If this arc persists within the circuit breaker's internal space for an extended period of time, it can damage the circuit breaker's components.

[0007] Accordingly, conventional air circuit breakers include multiple arc extinguishing sections arranged adjacently at the top to stably extinguish and discharge arcs.

[0008] And, the generated arc passes through the above-described arc-extinguishing section from bottom to top, and as the arc pressure increases, the moving speed becomes faster, and it moves along the designated discharge path of the arc-extinguishing section and is discharged to the outside.

[0009] And the arc passing through the arc section is discharged together with a high temperature gas (hot gas) containing conductivity (hereinafter referred to as “arc gas”) outside the arc section.

[0010] Meanwhile, the electric capacity of the power system has been increasing recently, which has resulted in higher fault voltage and larger fault current.

[0011] In such a case of current interruption, the pressure inside the arc-extinguishing section inevitably increases, and in this case, arc-extinguishing gas, including arc, is discharged through other parts, such as gaps between arc-extinguishing sections, other than the designated discharge path of the arc-extinguishing section.

[0012] Meanwhile, the upper part of the arc unit has an upper cover panel made of steel, and there are cases where a short circuit occurs between arc units due to conductive arc gas discharged through a gap, resulting in a failure in the blocking.

[0013] In other words, the arc gas emitted from the gap causes high conductivity to the upper cover panel made of steel material on the upper part of the arc section, causing insulation breakdown between adjacent arc sections, and causing a short circuit between phases, resulting in a failure of the shielding.

[0014] Accordingly, there is an urgent need for the development of an air circuit breaker that can secure high breaking performance even at high voltage / current by enabling complete insulation between sub-circuits.

[0015] The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to provide an air circuit breaker having an insulating member capable of improving arc-extinguishing performance.

[0016] In addition, the present invention provides an air circuit breaker equipped with an insulating material that can secure high blocking performance even at high voltage / current by implementing complete insulation between the circuit breaker parts.

[0017] In addition, the present invention provides an air circuit breaker having an insulating member capable of implementing complete insulation between arc sections by blocking the arc gas movement space between arc sections by shape deformation due to pressure when arc gas is discharged while maintaining assembly.

[0018] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the description below.

[0019] According to one aspect of the present invention, an air circuit breaker having an insulating member is provided.

[0020] An air circuit breaker comprises: a main body; an operating section provided in an internal space of the main body and generating an arc by operating an operator relative to a stator; a plurality of arc extinguishing sections installed above the operating section and arranged adjacently to extinguish the arc; and an insulating member arranged on each side of the second direction of the arc extinguishing section, the insulating member having an end that expands due to pressure when the arc extinguishing gas generated from the arc extinguishing section is discharged, thereby blocking a movement space of the arc extinguishing gas between the arc extinguishing section and an adjacent arc extinguishing section.

[0021] At this time, the above-mentioned protection unit includes an upper frame and an upper cover panel covering an upper surface of the upper frame.

[0022] And, the insulating material is fixed between the upper frame and the upper cover panel.

[0023] For example, the insulating member includes a fixed portion fixed between the upper frame and the upper cover panel, a bent portion extending while an end of the fixed portion is bent to wrap around a side surface of the upper cover panel, and a plate-shaped blocking portion extending while an end of the bent portion is bent to cover one side of the upper surface of the upper cover panel in the first direction.

[0024] At this time, the fixed portion and the bending portion may have a length corresponding to the length of the upper cover panel in the first direction.

[0025] At this time, the blocking portion may have a length longer than the length of the upper cover panel in the first direction.

[0026] Meanwhile, the upper cover panel is formed with a plurality of exhaust holes. At this time, the blocking portion of the insulating material is arranged so as to cover a portion of the exhaust holes arranged on both ends in the second direction.

[0027] At this time, a fastening hole is formed in the fixed part through which the fastening member passes.

[0028] At this time, the insulating member may have elasticity so that the unfolded end can be folded and returned to its original state to maintain its shape when the discharge of the gas stops.

[0029] At this time, the insulating member may be made of a flexible material.

[0030] According to the above configuration, the air circuit breaker having an insulating member according to the present invention has an effect of improving arc extinguishing performance by preventing insulation breakdown between adjacent extinguishing parts by including an insulating member that spreads out by pressure when extinguishing gas is discharged on both sides of the second direction of the extinguishing part.

[0031] In addition, while maintaining the assembly properties, the insulating member's blocking portion can be expanded by pressure when the gas is discharged, thereby blocking the space for the gas to move between the blocking portions, thereby achieving complete insulation, thereby achieving the effect of securing high blocking performance even at high voltages / currents.

[0032] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the composition of the invention described in the claims.

[0033] FIG. 1 is a drawing showing an air circuit breaker having an insulating member according to one embodiment of the present invention.

[0034] FIG. 2 and FIG. 3 are drawings showing an example of a circuit breaker applied to an air circuit breaker having an insulating member according to one embodiment of the present invention.

[0035] FIG. 4 and FIG. 5 are drawings showing the arrangement and operating state of an insulating member in a circuit breaker applied to an air circuit breaker equipped with an insulating member according to one embodiment of the present invention.

[0036] FIG. 6 and FIG. 7 are drawings showing a state in which, when a extinguishing gas is discharged from an air circuit breaker equipped with an insulating member according to one embodiment of the present invention, a blocking portion of an insulating member is spread out to block the movement space of the extinguishing gas between the extinguishing portion and an adjacent extinguishing portion.

[0037] The present invention, in its best form, provides an air circuit breaker having an insulating member, which comprises: a main body; an operating member provided in an internal space of the main body and generating an arc by operating an operator with respect to a stator; a plurality of arc extinguishing members installed above the operating member and arranged adjacently to extinguish the arc; and an insulating member arranged on each of two sides of the arc extinguishing members in a second direction, the insulating member having an end that expands due to pressure when the arc extinguishing gas generated from the arc extinguishing members is discharged, thereby blocking a movement space of the arc extinguishing gas between the arc extinguishing members and adjacent arc extinguishing members.

[0038] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts irrelevant to the description are omitted in the drawings, and the same reference numerals designate identical or similar components throughout the specification.

[0039] The words and terms used in this specification and claims should not be construed as limited to their ordinary or dictionary meanings, but should be interpreted in a way that is consistent with the technical idea of ​​the present invention, in accordance with the principles by which the inventor can define terms and concepts in order to best explain his or her invention.

[0040] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings correspond to a preferred embodiment of the present invention, and do not represent all of the technical ideas of the present invention, so there may be various equivalents and modified examples that can replace the configuration at the time of filing of the present invention.

[0041] In this specification, terms such as “include” or “have” are intended to describe the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0042] When a component is said to be "in front of," "behind," "above," or "below" another component, this includes not only being placed "in front of," "behind," "above," or "below" the other component in direct contact with it, but also if there is another component intervening therebetween. Furthermore, when a component is said to be "connected" to another component, this includes not only being directly connected to one another, but also being indirectly connected to one another, unless there are special circumstances.

[0043] The terms "X-axis", "Y-axis", and "Z-axis" used in the description will be understood with reference to the coordinate system illustrated in the drawings. In addition, although the X-axis direction is referred to as the first direction, the Y-axis direction as the second direction, and the Z-axis direction as the third direction in the description, this is only an example according to a relative viewpoint, and the first to third directions and the coordinate axes (X, Y, Z axes) are only introduced to explain the relative positions between components, and do not limit the absolute positions of each component.

[0044] In addition, in explaining the present invention, specific descriptions of related known functions or configurations will be omitted in order to avoid obscuring the gist of the present invention.

[0045]

[0046] Hereinafter, an air circuit breaker having an insulating member according to one embodiment of the present invention will be described with reference to the drawings.

[0047] As illustrated in FIGS. 1 to 7, an air circuit breaker (1) having an insulating member according to one embodiment of the present invention includes an insulating member (100) that spreads the blocking member (130) by pressure when the arc gas is discharged on both sides of the arc extinguishing section (40) in the second direction, thereby preventing insulation breakdown between adjacent arc extinguishing sections (40) and enhancing arc extinguishing performance.

[0048] To this end, an air circuit breaker (1) equipped with an insulating member according to one embodiment of the present invention largely includes a main body (10), an operating part (20), a terminal part (30), a protection part (40), and an insulating member (100).

[0049] First, the main body (10) forms the outer shape of the air circuit breaker (1), has a space inside, and each component for the operation of the air circuit breaker (1) can be mounted.

[0050] In other words, the main body (10) functions as a kind of housing.

[0051] And the main body (10) is formed of a material with high heat resistance and high strength, which is to prevent damage to each component mounted inside and to prevent damage caused by an arc generated inside.

[0052] In the city, the main body (10) is depicted as a square body shape, but it is not limited to this, and it can have various shapes as long as components for the operation of the air circuit breaker (1) can be mounted and the inside can be electrically connected to the outside.

[0053] And, the operating part (20) is placed in the internal space of the main body part (10), and is a part where an arc is generated when the movable part operates with respect to the stator, and the terminal part (30) is a part that performs a connection with another device.

[0054] Since the structure of an already known air circuit breaker can be applied to the operating part (20) and terminal part (30), a detailed description of the related known function or configuration will be omitted in order to avoid obscuring the gist of the present invention.

[0055] However, the operating part (20) includes a movable member (not shown) and a stator (not shown) that comes into contact with the movable member. When the movable member comes into contact with the stator, current flows through the line. When a large current flows through the line due to a safety accident, the movable member is separated from the stator and the current of the line is cut off.

[0056] At this time, the current flowing between the movable part and the stator of the operating part (20) does not immediately disappear, but changes into an arc shape and extends.

[0057] In order to stably extinguish such arcs and discharge them to the outside, an air circuit breaker (1) equipped with an insulating member according to one embodiment of the present invention includes a plurality of extinguishing parts (40) arranged adjacently in a second direction on the upper portion of a main body (10) (see FIGS. 1, 6 and 7).

[0058] And, the generated arc passes through the arc section (40) from the bottom to the top in the third direction together with the arc gas, moves along the designated discharge path of the arc section (40), and is discharged to the outside.

[0059]

[0060] This, the sub-compartment (40) is described in more detail with reference to FIGS. 1 to 5 as follows.

[0061] The arc extinguishing unit (40) is installed on the upper part of the operating unit (20) in the main body (10) and primarily extinguishes the arc.

[0062] To this end, the sub-circuit (40) has a shape that can be inserted or withdrawn into the upper frame of the main body (10). In the drawing, three sub-circuits (40) are provided adjacently along the second direction of the main body (10). However, this is not limited to this, and it goes without saying that more may be provided depending on the size of the air circuit breaker (1).

[0063] In one embodiment, the fire extinguishing unit (40) has a frame-shaped upper frame (41) and plate-shaped side frames (42) positioned at mutually spaced positions on both sides of the second direction of the upper frame (41), a plurality of grids (43) are provided between the side frames (42), and an upper cover panel (46) is coupled to the upper portion of the upper frame (41) in which a plurality of exhaust holes (46a) are formed to pass through so that fire extinguishing gas can pass.

[0064] The grid (43) is a magnetic material that applies an attractive force to the arc, which is a flow of electrons, and guides the generated arc to the arc extinguishing part (40).

[0065] These grids (43) can be stacked in a plurality of pieces spaced apart in the first direction in the internal space of the sub-compartment (40).

[0066] Through the space formed by a plurality of grids (43) spaced apart from each other, the introduced arc is divided and flows, thereby increasing the pressure of the arc and increasing the moving speed and arc extinguishing speed of the arc.

[0067] If necessary, a shield panel (44) having a through hole (44a) formed between the upper cover panel (46) and the upper portion of the grid (43) and a plurality of mesh members (45) may be provided. The shield panel (44) serves to control the amount of high-temperature extinguishing gas passing through or to support components assembled at the lower portion from the upper portion.

[0068] The grid (43), shield panel (44) and mesh member (45) are known functions, and a detailed description of their configuration will be omitted to avoid obscuring the gist of the present invention.

[0069] Meanwhile, as described above, the arc-extinguishing unit (40) applied to the air circuit breaker (1) equipped with an insulating member according to one embodiment of the present invention is a box-shaped unit including the above-described components, guides the discharge path of the arc-extinguishing gas, and is positioned adjacent to the movable member and the stator at the top of the operating unit (20).

[0070] At this time, the upper cover panel (46) made of steel material of the sub-housing unit (40) is placed adjacent to another upper cover panel (46) of the neighboring sub-housing unit (40).

[0071] In addition, the gasket (40) is structured to be connected to the upper part of the main body (10) in a way that it can be inserted or withdrawn, and a gap (11, Fig. 1) that allows gas flow must be formed between it and the upper frame of the main body (10) to which it is connected (see Fig. 1).

[0072] Accordingly, the arc-blocking member (40) applied to the air circuit breaker (1) equipped with an insulating member according to one embodiment of the present invention further includes an insulating member (100) to prevent a short circuit between adjacent arc-blocking members (40) from occurring when conductive arc-blocking gas is discharged through the gap (11) described above.

[0073] Referring again to FIGS. 2 to 4, the insulating member (100) has a folded panel (plate) shape and is arranged on each side of the second direction of the shielding portion (40).

[0074] And, when the arc gas generated in the arc section (40) is discharged, the end portion placed on the upper surface of the arc section (40) is spread out to both sides in the second direction, that is, left and right, thereby blocking the space for the arc gas to move between the arc section (40) and the adjacent arc section (40).

[0075] In other words, the arc gas escaping through the gap (11) is blocked by the insulating material (100) spread out in the adjacent arc section (40) and the arc section (40), thereby preventing the occurrence of a short circuit between the upper cover panel (46) made of steel material of the arc section (40).

[0076] Meanwhile, the insulating material (100) may be an insulating paper manufactured by compressing paper. In other words, the insulating material (100) can be applied to various materials as long as it is made of an insulating material and can be formed into a thin panel (plate) shape like paper. For example, various synthetic resin materials such as rubber or epoxy can also be applied.

[0077] Meanwhile, as described above, the sub-frame (40) includes an upper frame (41) and an upper cover panel (46) covering the upper surface of the upper frame (41).

[0078] At this time, the above-described insulating material (100) is inserted and fixed between the upper frame (41) and the upper cover panel (46).

[0079] As a specific example, the insulating member (100) includes a fixed portion (110), a bending portion (120), and a blocking portion (130).

[0080] The fixing portion (110) of the insulating member (100) is a portion fixed between the upper frame (41) of the extinguishing portion (40) and the upper cover panel (46), and may have, for example, a panel (plate) shape and may have a length corresponding to the length of the upper frame (41) or the upper cover panel (46) in the first direction. However, it is not limited thereto, and it is obvious that it may have various shapes as long as it can maintain the fixing force between the upper frame (41) of the extinguishing portion (40) and the upper cover panel (46) even under the pressure generated when the extinguishing gas is discharged.

[0081] Meanwhile, this fixed part (110) has a fastening hole (111) through which a fastening member penetrates, and the fixed part (110) is fixedly installed on the upper frame (41) by the fastening member coupled to the fastening hole (111), so that the insulating member (100) does not move from its position even when the pressure of the insulating gas is discharged.

[0082] In addition, the upper frame (41) and the upper cover panel (46) of the sub-body (40) are joined to each other in a close state by fastening members such as bolts, as shown in Fig. 3.

[0083] When the upper frame (41) and the upper cover panel (46) are fastened and fixed in a close contact state in this way, the fixing portion (110) of the insulating member (100) placed between them is compressed, so that the insulating member (100) can maintain its position without being displaced even under the pressure of the discharged gas.

[0084] In addition, the bent portion (120) of the insulating member (100) has a shape that can be extended by bending the end of the above-described fixing portion (110) and wrap around the side of the upper cover panel (46).

[0085] Meanwhile, the fixed portion (110) and the bent portion (120) described above have a length corresponding to the length of the first direction of the upper cover panel (46) so that the conductive arc gas escaping through the gap (11) does not come into contact with the neighboring arc part (40), and can completely block the side of the upper cover panel (46).

[0086] In other words, preferably, the fixed portion (110) and the bent portion (120) completely wrap around the side of the upper cover panel (46) to fundamentally block the penetration of the gas discharged from the neighboring gas-bearing portion (40).

[0087] And, the blocking portion (130) of the insulating member (100) has a plate shape that can cover one side of the upper surface in the first direction of the upper cover panel (46) by extending the end of the bending portion (120) while being bent again toward the upper cover panel (46).

[0088] Meanwhile, the upper cover panel (46) described above includes a plurality of exhaust holes (46a) formed through the exhaust gas for exhausting the gas. In the drawing, the exhaust holes (46a) are shown as having a square hole shape, but are not limited thereto and may have various shapes such as circular or oval shapes as needed.

[0089] And, referring to Fig. 4, the blocking portion (130) of the above-described insulating member (100) is arranged so as to cover a portion of the above-described exhaust hole (46a) arranged on both end sides of the second direction of the upper cover panel (46).

[0090] In other words, the blocking portion (130) has an extended length (d1) so as to cover a portion of the exhaust hole (46a).

[0091] According to this configuration, when the conductive extinguishing gas passes through the exhaust hole (46a) described above under pressure and is discharged to the outside, the shape of the blocking portion (130) of the insulating member (100) is deformed so as to spread out to both sides of the second direction of the extinguishing portion (40) (see FIGS. 4 and 5).

[0092] In other words, the blocking portion (130) is rotated around the upper portion of the bending portion (120) and spreads out to both sides of the arc portion (40).

[0093] The blocking section (130) spread out in this way blocks the space for the moving gas between the arcing section (40) and the neighboring arcing section (40), thereby fundamentally preventing a short circuit between the arcing sections (see Fig. 7).

[0094] Meanwhile, it goes without saying that the blocking portion (130) may be formed to be extended to a length longer than the length of the upper cover panel (46) in the first direction for more complete blocking of the Soho gas, if necessary.

[0095] Meanwhile, the insulating member (100) provided in the protective part (40) of the air circuit breaker (1) equipped with an insulating member according to one embodiment of the present invention may have elasticity so that it can be spread out or returned to its original state according to the discharge and stop of the protective gas.

[0096] The unfolding end of the insulating member (100), i.e., the blocking portion (130), unfolds about the bending portion (120) by the exhaust pressure when the extinguishing gas is discharged, and when the extinguishing gas is stopped (or does not occur), it folds again and returns to its original state to maintain its shape.

[0097] In other words, the insulating material (100) may be made of a flexible material and have elasticity.

[0098]

[0099] Referring again to FIGS. 4 and 5, and FIGS. 6 and 7, the following describes a state of use in which complete insulation between arc sections is enabled through shape deformation of the insulating member (100) due to pressure when discharging arc gas in an air circuit breaker (1) equipped with an insulating member according to one embodiment of the present invention.

[0100] As described above, the circuit breaker (1) applied to the air circuit breaker of one embodiment of the present invention is provided with an insulating member (100) including a blocking member (130) on both sides in the second direction.

[0101] And, the plurality of sub-circuits (40) are connected to be introduced or withdrawn from the upper part of the main body (10) to the upper part of the operating part (20). These plurality of sub-circuits (40) are arranged adjacent to each other in the second direction of the main body (10).

[0102] Figure 6 shows the normal energized state of the air circuit breaker (1), in which the insulating member (100) coupled to the arc-blocking part (40) is positioned in a state in which the arc-blocking part (130) is in contact with the upper surface of the upper cover panel (46) of the arc-blocking part (40).

[0103] And, Fig. 7 shows the state of the air circuit breaker (1) in which a short circuit accident occurred in the state of Fig. 6.

[0104] At this time, the operating part (20) separates the movable part from the stator and blocks the current in the line.

[0105] At this time, the current flowing between the movable part and the stator of the operating part (20) is not immediately extinguished, but changes into an arc shape and extends. The generated arc is guided to the arc extinguishing part (40) and is discharged to the outside while passing through the exhaust hole (46a) formed in the upper cover panel (46) of the arc extinguishing part (40) together with the arc extinguishing gas.

[0106] Meanwhile, the small-capacity gas discharged while passing through the exhaust hole (46a) pushes out the blocking part (130) of the insulating member (100), and the blocking part (130) is rotated about the bending part (120) and spread out (see Fig. 7).

[0107] The blocking portion (130) of the insulating member (100) spread out in this way blocks the movement space of the arc gas between the arc portion (40) and the neighboring arc portion (40) together with the spread out blocking portion (130) of the neighboring arc portion (40).

[0108] As insulation is provided between the sub-assemblies in this way, insulation breakdown between the upper cover panels (46) made of steel is prevented and short circuits between phases can be fundamentally blocked.

[0109] Meanwhile, when the Soho gas is discharged and then the discharge stops, the blocking portion (130) of the insulating member (100) is folded again and returns to its original state in contact with the upper surface of the upper cover panel (46) of the Soho portion (40) as shown in FIG. 6, thereby maintaining its shape.

[0110]

[0111] As described above, the air circuit breaker (1) having an insulating member according to one embodiment of the present invention includes an insulating member (100) having a blocking member (130) that is expanded by pressure when an arc gas is discharged on both sides of the arc extinguishing member (40) in the second direction, thereby preventing insulation breakdown between adjacent arc extinguishing members (40) and thereby improving arc extinguishing performance.

[0112] In addition, since the insulating member (100) is a flexible material and has elasticity, the assembly of the air circuit breaker (1) including the arc section (40) can be maintained, and the space for the arc gas to move between the arc sections (40) can be blocked through the shape deformation of the arc section (130) unfolding, thereby performing complete insulation.

[0113] Accordingly, the air circuit breaker (1) equipped with the insulating material of the present invention can secure high breaking performance even at high voltage / current.

[0114] Although the embodiments of the present invention have been described, the spirit of the present invention is not limited to the embodiments presented in this specification, and those skilled in the art who understand the spirit of the present invention will be able to easily propose other embodiments by adding, changing, deleting, or adding components within the scope of the same spirit, but this will also be considered to fall within the spirit of the present invention.

Claims

1. Main body; An operating section provided in the internal space of the main body and in which an arc is generated by the operation of the movable section relative to the stator; A plurality of arc extinguishing parts installed on the upper part of the above operating part and arranged adjacently to extinguish the arc; and Including an insulating member arranged on each side of the second direction of the above-mentioned arc section, and which blocks the movement space of the arc gas between the above-mentioned arc section and the adjacent arc section by spreading the end portion due to the pressure when the arc gas generated from the above-mentioned arc section is discharged. Air circuit breaker with insulating material.

2. In paragraph 1, The above-mentioned protective cover comprises an upper frame and an upper cover panel covering an upper surface of the upper frame, An air circuit breaker having an insulating member, one end of which is fixed between the upper frame and the upper cover panel.

3. In paragraph 2, The above insulating material is, A fixing member fixed between the upper frame and the upper cover panel, A bending portion that extends while the end of the above fixed portion is bent and wraps around the side of the upper cover panel, An air circuit breaker having an insulating member, the air circuit breaker including a plate-shaped blocking portion that extends while the end of the above-mentioned bending portion is bent and covers one side of the upper surface of the upper cover panel in the first direction.

4. In paragraph 3, The above fixed part and the above bent part, An air circuit breaker having an insulating member having a length corresponding to the length of the first direction of the upper cover panel.

5. In paragraph 3, The above blocking part is, An air circuit breaker having an insulating member having a length longer than the length in the first direction of the upper cover panel.

6. In paragraph 3, The upper cover panel is formed with a plurality of exhaust holes, An air circuit breaker having an insulating member, wherein the above-mentioned blocking member is arranged so as to cover a portion of the exhaust hole arranged on both end sides in the second direction.

7. In paragraph 3, The above-mentioned fixed part is an air circuit breaker having an insulating member and a fastening hole formed therein through which a fastening member penetrates.

8. In paragraph 1, The above insulating material is, An air circuit breaker having an insulating member that is elastic so that the unfolded end can fold and return to its original state to maintain its shape when the discharge of the above-mentioned gas stops.

9. In paragraph 1, An air circuit breaker having an insulating member, wherein the insulating member is made of a flexible material.

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