Circuit breaker for wiring

Abstract

The invention discloses a circuit breaker for wiring. The circuit breaker for wiring is characterized in that the insulation performance of the housing is kept constant even if the interior of the housing is polluted by the inflowing oxides. A circuit breaker for wiring according to an embodiment of the present invention includes a housing, a housing cover, and a plurality of base assemblies. The shell cover covers the shell, and the plurality of base assemblies are contained in the shell. The base assembly has a base cover. The base cover has a space formed therein to accommodate the fixed contact, the movable contact, and the arc extinguishing portion. An insulating coating portion is formed on an inner surface of the housing, and the inner surface of the housing faces an outer surface of the base cover when the base cover is inserted into the housing. The insulating coating portion is formed by coating an inner surface of the housing with an insulating material.

Description

Technical Field

[0001] This invention relates to a wiring circuit breaker having a housing coated with an insulating material. Background Technology

[0002] A wiring circuit breaker (MCCB: Molded Case Circuit Breaker) is a type of circuit breaker designed to disconnect energized electrical equipment in the event of abnormal currents such as leakage or overcurrent to prevent electrical accidents.

[0003] A typical wiring circuit breaker internally includes fixed contacts and movable contacts. During the flow of a normal current (not an abnormal current), the fixed contacts and movable contacts are in contact with each other, thus enabling energization. Furthermore, if an abnormal current occurs, the fixed contacts and movable contacts separate, thereby disconnecting the energizer.

[0004] When the fixed and movable contacts separate, an electric arc is generated due to the abnormal current flowing between them. After an arc extinguishing process, the generated arc is discharged to the outside of the wiring circuit breaker.

[0005] The resulting electric arc can be defined as the flow of electrons under high temperature and high pressure.

[0006] Due to the high temperature and high pressure of the electric arc, oxides are generated inside the housing that houses the fixed and movable contacts. These oxides flow out of the housing and into the case of the wiring circuit breaker. The oxides flowing into the case contaminate the interior of the case and reduce its insulation performance.

[0007] To prevent contamination caused by oxides, etc., U.S. Patent Publication No. 2013-0334174 discloses that two parts forming the interrupter housing 300 are fastened together with bolts and nuts, and that an adhesive is used on the outer surfaces of the two parts.

[0008] However, U.S. Patent Publication No. 2013-0334174 does not disclose a solution to prevent the insulation performance of the base 102 from deteriorating when contaminants such as oxides flow into the interior of the base 102. Here, the base 102 corresponds to the housing of the aforementioned wiring circuit breaker.

[0009] Therefore, even if the interior of the circuit breaker housing is contaminated with pollutants such as oxides, the insulation performance of the housing must be kept constant. Summary of the Invention

[0010] The problem to be solved

[0011] The object of the present invention is to provide a wiring circuit breaker that can maintain the insulation performance of the housing at a constant level even if the interior of the housing of the wiring circuit breaker is contaminated by the inflowing oxides.

[0012] Technical solutions to the problem

[0013] The objectives of the present invention described above are achieved through the following content.

[0014] An example of a wiring circuit breaker according to an embodiment of the present invention includes a housing, a housing cover, and a plurality of base assemblies. The housing cover covers the housing, and the plurality of base assemblies are housed within the housing. Each base assembly has a base cover. The base cover has an internal space for accommodating a fixed contact, a movable contact, and an arc-extinguishing part. An insulating coating is formed on the inner surface of the housing, and the inner surface of the housing faces the outer surface of the base cover when the base cover is inserted into the housing. The insulating coating is formed by coating the inner surface of the housing with an insulating material.

[0015] Specifically, the insulating coating is formed on the inner surface of at least one of the bottom, one side wall, and the other side wall of the housing.

[0016] Specifically, the insulating coating is formed from any one or a mixture of more than one of silicone, polyurethane, polyamide, acrylic, and epoxy materials.

[0017] Specifically, the insulating coating is formed by spraying or brushing.

[0018] Specifically, the thickness of the insulating coating is 15μm to 50μm.

[0019] Invention Effects

[0020] In an embodiment of the present invention, the wiring circuit breaker has its housing coated with an insulating material, thereby protecting the housing from the effects of oxides even if the housing is contaminated by incoming oxides, and maintaining the insulation performance of the housing at a constant level.

[0021] Furthermore, in the example of the wiring circuit breaker of the present invention, since the inner surface of the housing is coated with an insulating material, the insulation performance of the housing is further improved when the oxide does not flow into the interior of the housing of the wiring circuit breaker. Attached Figure Description

[0022] Figure 1 This is a diagram illustrating an example of a wiring circuit breaker in an embodiment of the present invention.

[0023] Figure 2 From Figure 1 The wiring circuit breaker has its housing cover removed, and a diagram showing the housing and multiple base assemblies is provided.

[0024] Figure 3 This is a diagram showing a base assembly.

[0025] Figure 4 This is a cross-sectional view of the base assembly with the handle attached.

[0026] Figure 5 This is a diagram showing the electric arc generated between the movable and fixed contacts.

[0027] Figure 6 This is a diagram showing the housing of the wiring circuit breaker of the present invention.

[0028] Figure 7 yes Figure 6 The cross-sectional view of the housing is shown in the figure. Detailed Implementation

[0029] Hereinafter, with reference to the accompanying drawings, examples of embodiments of the present invention will be described in more detail. Detailed descriptions of constituent elements of the present invention that are readily understood and reproduced by those skilled in the art will be omitted to avoid obscuring the main points of the invention.

[0030] Typically, a wiring circuit breaker (MCCB: Molded Case Circuit Breaker) is an electrical device that protects circuits and loads by automatically disconnecting the circuit in the event of an electrical overload or short circuit.

[0031] Hereinafter, an example of a wiring circuit breaker in an embodiment of the present invention will be described.

[0032] Figure 1 This is a diagram illustrating an example of a wiring circuit breaker in an embodiment of the present invention. Figure 2 From Figure 1 The wiring circuit breaker has its housing cover removed, and a diagram showing the housing and multiple base assemblies is provided.

[0033] Reference Figure 1 and Figure 2 According to an example of an embodiment of the present invention, the wiring circuit breaker 10 includes a case 12, a case cover 11, and a plurality of base assemblies 13.

[0034] The housing 12 and housing cover 11 form the appearance of the wiring circuit breaker 10 in an example of an embodiment of the present invention.

[0035] The shell 12 and the shell cover 11 can be joined together to form a polyhedron (e.g., a hexahedron) with an internal accommodating space.

[0036] Specifically, the housing 12 is joined to the housing cover 11, thereby creating an accommodating space inside the housing 12 and the housing cover 11. The joining can be achieved by fastening components such as bolts, nuts, and screws.

[0037] The housing 12 and housing cover 11 also include other components that fasten the housing 12 and housing cover 11 to each other by means of fastening members (e.g., holes for bolts or screws to be inserted, slots for nuts to be inserted, etc.).

[0038] The receiving space formed by the combination of the housing 12 and the housing cover 11 can accommodate a plurality of base assemblies 13.

[0039] The housing 12 can be formed in the shape of a box with an opening on one side (the top surface in the attached figure) and an internal accommodating space.

[0040] The housing 12 has a bottom 121. For example, the bottom 121 refers to the base of the box.

[0041] Depending on the user's needs, the bottom 121 can be formed with bends, steps, holes, grooves, etc.

[0042] In addition, the housing 12 has a side portion 122, a side portion 123, a side wall portion 124, and a side wall portion 125.

[0043] For example, one side portion 122, the other side portion 123, one side wall portion 124, and the other side wall portion 125 represent the side panels of the box.

[0044] One side portion 122, another side portion 123, one side wall portion 124 and another side wall portion 125 are formed along the edge of the bottom 121 in a direction orthogonal to the bottom 121.

[0045] One side portion 122 and the other side portion 123 are configured to be separated by a predetermined distance and face each other.

[0046] One side portion 122 and the other side portion 123 each have one end and another end. One end and the other end are opposite to each other.

[0047] At one end 1221 and the other end 1222 of one side portion 122 (see reference) Figure 6A plurality of side openings 122h are formed between the two sides of the side opening 122.

[0048] Additionally, at one end 1231 and the other end 1232 of the other side portion 123 (see reference) Figure 6 A plurality of openings 123h on the other side are formed between the two sides of the opening 123.

[0049] The opening 122h on one side or the opening 123h on the other side is provided with a terminal that is connected to the power supply side or the load side.

[0050] The interior and exterior of the housing 12 are electrically connected through either the opening 122h on one side or the opening 123h on the other side. This connection is achieved by an energized portion 138 penetrating both the interior and exterior of the housing 12 and being integrated into the housing 12.

[0051] One side wall portion 124 and the other side wall portion 125 are configured to be separated by a predetermined distance and face each other.

[0052] Each of the side wall portion 124 and the other side wall portion 125 includes one end and another end. The one end and the other end are opposite to each other.

[0053] One side wall portion 124 and the other side wall portion 125 are each formed in the shape of a plate having a predetermined length (length in the x direction in the figure), a predetermined thickness (length in the y direction in the figure), and a predetermined width (length in the z direction in the figure).

[0054] One side portion 122, the other side portion 123, one side wall portion 124 and the other side wall portion 125 are connected to each other.

[0055] Specifically, one end 1221 of one side portion 122 and one end 1241 of one side wall portion 124 (see reference) Figure 6 The other end 1222 of one side portion 122 is connected to one end 1251 of the other side wall portion 125 (see reference). Figure 6 )connect.

[0056] Furthermore, one end 1231 of the other side portion 123 and the other end 1242 of the side wall portion 124 (see reference) Figure 6 The other end 1232 of the other side portion 123 is connected to the other end 1252 of the other side wall portion 125 (see reference). Figure 6 )connect.

[0057] The accommodating space of the housing 12 refers to the space surrounded by the bottom 121, one side portion 122, the other side portion 123, one side wall portion 124, and the other side wall portion 125.

[0058] The bottom 121, one side 122, the other side 123, one side wall 124, and the other side wall 125 can be integrally formed.

[0059] The housing 12 is made of insulating materials such as plastic or synthetic resin. Therefore, it can prevent safety accidents that may occur due to arbitrary current flow through the housing 12.

[0060] The housing cover 11 serves to cover the housing 12. Through the housing cover 11, the constituent elements disposed in the receiving space of the housing 12 (e.g., the base assembly 13, etc.) are not exposed to the outside.

[0061] The housing cover 11 can be formed in the shape of a box with an opening on one side (the bottom surface in the attached figure) and an internal receiving space.

[0062] The upper plate of the housing cover 11 can be formed with bends, steps, holes, grooves, etc., according to the user's needs.

[0063] A through hole is formed in the upper plate of the housing cover 11. A handle 1351 is disposed in the through hole.

[0064] The housing cover 11 has a side panel formed along the edge of the upper plate in a direction orthogonal to the upper plate.

[0065] The side panel formed on the housing cover 11 can be connected to one side portion 122, another side portion 123, one side wall portion 124 and / or another side wall portion 125 formed on the housing 12. As mentioned above, the connection can be achieved by fastening members.

[0066] On the other hand, the housing 12 contains components for cutting off power and extinguishing the generated arc when an abnormal current (fault current) occurs.

[0067] Specifically, a plurality of base assemblies 13 are accommodated in the receiving space of the housing 12. That is, a plurality of base assemblies 13 are disposed in the receiving space of the housing 12. Figure 2 Three base components 13a, 13b, and 13c are shown.

[0068] Figure 3 This is a diagram showing a base assembly 13. Figure 4 This is a cross-sectional view showing the base assembly 13b with the handle 1351 mounted on it.

[0069] Apart from the handle 1351 and the various components for mounting the handle 1351, the plurality of base assemblies 13 may all be formed in the same or similar structure.

[0070] Although Figure 2Three base assemblies 13a, 13b, and 13c are shown, but this is not a limitation. Base assembly 13 can be configured with four or more depending on the user's needs.

[0071] A plurality of base assemblies 13 are connected to each other. Each of the plurality of base assemblies 13 includes various constituent elements that enable the plurality of base assemblies 13 to be connected to each other.

[0072] Multiple base assemblies 13 are connected to each other and are simultaneously energized or de-energized.

[0073] Any one of the plurality of base assemblies 13 is equipped with a handle 1351 and various constituent elements for mounting the handle 1351.

[0074] By operating the handle 1351, the plurality of base assemblies 13 can be simultaneously energized or de-energized.

[0075] As mentioned above, the components and operating principles for connecting the plurality of base assemblies 13 to each other and simultaneously energizing or de-energizing them follow known techniques.

[0076] Reference Figure 3 and Figure 4 The base assembly 13 includes a base cover 131 and a fixed contact 132, a movable contact 133, an opening and closing mechanism 135, an arc extinguishing part 134, and a tripping part 136 housed in the base cover 131.

[0077] The base cover 131 forms the appearance of the base assembly 13.

[0078] The base cover 131 may have an internal receiving space, and the base cover 131 may be formed in a polyhedral shape (e.g., a hexahedral shape). Each face of the polyhedron may be formed with bends, steps, holes, grooves, etc., according to the user's needs.

[0079] For ease of assembly of the constituent elements constituting the base assembly 13, the base cover 131 has a physically separate first base cover 1311 and a second base cover 1312.

[0080] The first base cover 1311 and the second base cover 1312 can be manufactured separately and then joined together. The joining can be achieved by fastening components such as bolts, nuts, and screws.

[0081] The first base cover 1311 and the second base cover 1312 form the appearance of the base assembly 13. The first base cover 1311 may be configured, for example, on the left side, and the second base cover 1312 may be configured, for example, on the right side.

[0082] According to an example of an embodiment of the present invention, the first base cover 1311 and the second base cover 1312 can be formed symmetrically to each other. That is, the opposite sides of the first base cover 1311 and the second base cover 1312 can be formed with the same structure. Similarly, the opposite sides of the first base cover 1311 and the second base cover 1312 can be formed with the same structure.

[0083] Spaces are formed inside the first base cover 1311 and the second base cover 1312. The spaces are connected to each other when the first base cover 1311 and the second base cover 1312 are joined together. The spaces accommodate a fixed contact 132, a movable contact 133, an opening and closing mechanism 135, an arc extinguishing part 134, and a tripping part 136, etc.

[0084] The trip unit 136 operates when an abnormal current (fault current) flows in the wiring circuit breaker 10, thereby cutting off the external and internal power supply to the wiring circuit breaker 10. In other words, the trip unit 136 senses the overcurrent or short-circuit current flowing in the circuit and guides the trip operation of the switching mechanism 135.

[0085] The tripping part 136 is disposed in part of the housing 12. The tripping part 136 is electrically connected to the fixed contact 132.

[0086] The tripping unit 136 includes a tripping lever, a trip unit, and a resilient member to perform its function. If the tripping unit 136 is activated, the opening and closing mechanism 135 connected to the tripping unit 136 is activated, so that external users can easily identify that a tripping action has been performed.

[0087] Since the operation process of the trip unit 136 and the operation process of the opening and closing mechanism unit 135 through the trip unit 136 are known technologies, detailed descriptions thereof are omitted.

[0088] An opening and closing mechanism 135 is configured (or installed) in any one of the plurality of base assemblies 13.

[0089] The opening and closing mechanism 135 moves the movable contact 133 to provide the power required for opening and closing the circuit.

[0090] The opening and closing mechanism 135 includes a handle 135 and various components for mounting and driving the handle 1351.

[0091] The opening and closing mechanism 135 is connected to the shaft 137, and the shaft 137 rotates when the opening and closing mechanism 135 rotates. That is, the shaft 137 can rotate by receiving the force from the opening and closing mechanism 135.

[0092] The opening and closing mechanism 135 rotates due to the operation of the tripping part 136. As a result, the shaft 137 also rotates, thereby causing the fixed contact 132 and the movable contact 133 to come into contact with or separate from each other.

[0093] A rotating pin 1371 is provided through the shaft 137. The shaft 137 receives the opening and closing power of the opening and closing mechanism 135 and rotates through the rotating pin 1371. The movable contact 133 also rotates with the shaft 137, thereby contacting or separating from the fixed contact 132.

[0094] Since the process by which the opening and closing mechanism 135 and the shaft 137 rotate due to the action of the tripping unit 136 is known technology, a detailed description thereof is omitted.

[0095] The movable contact 133 is rotatably configured (or mounted) on the shaft 137.

[0096] The movable contact 133 rotates with or alone in a counterclockwise or clockwise direction to contact or separate from the fixed contact 132. If the movable contact 133 and the fixed contact 132 are in contact, the circuit is energized; if the movable contact 133 and the fixed contact 132 are separated, the circuit is de-energized (in other words, disconnected).

[0097] The fixed contact 132 is configured to be separated from the movable contact 133 by a predetermined distance.

[0098] An arc-extinguishing part 134 is arranged around the part where the fixed contact 132 and the movable contact 133 are in contact with or separated from each other.

[0099] When the circuit is in normal condition, the fixed contact 132 and the movable contact 133 are in contact, and current flows in the circuit.

[0100] Conversely, if an abnormal current occurs in the circuit, a tripping action is performed by the operation of the tripping section 136 and the opening / closing mechanism section 135. That is, the movable contact 133 rotates and separates from the fixed contact 132, and the current in the circuit is cut off. At this time, an electric arc is generated around the part where the movable contact 133 and the fixed contact 132 separate (see reference). Figure 5 ).

[0101] The size (intensity) of the electric arc A is proportional to the magnitude of the current. Electric arc A is a phenomenon where atmospheric gas momentarily transforms into a plasma state due to voltage. The center temperature of electric arc A reaches 8,000℃ to 12,000℃ and possesses explosive expansion pressure. Therefore, electric arc A melts and consumes contacts 132 and 133, and degrades and damages surrounding components. The continuity of electric arc A has a significant impact on the performance and durability of the circuit breaker. Therefore, it is necessary to rapidly block, extinguish, and discharge electric arc A within the arc-extinguishing section 134.

[0102] The arc extinguishing section 134 extinguishes the electric arc A generated when the abnormal current is interrupted.

[0103] As the electric arc A enters the grid 1341, it is broken into short arcs, and the voltage of arc A increases. If the voltage of arc A increases, the current density increases, electron recombination occurs, and arc A is cooled and extinguished. Arc A is extinguished by the suppression of the release of free electrons.

[0104] Arc A is generated when the fixed contact 132 and the movable contact 133 separate. Arc A is extinguished when it passes through the arc extinguishing part 134 and discharged to the outside of the wiring circuit breaker 10.

[0105] The arc-extinguishing section 134 is located near the contact points of the fixed contact 132 and the movable contact 133. Specifically, the arc-extinguishing section 134 is located near the contact points of the fixed contact 132 and the movable contact 133 and near the path of rotation of the movable contact 133. As a result, the electric arc A extending along the movable contact 133 can easily enter the arc-extinguishing section 134.

[0106] A plurality of arc-extinguishing parts 134 may be provided. The plurality of arc-extinguishing parts 134 are respectively configured to be adjacent to the positions that contact the fixed contact 132 and the movable contact 133.

[0107] The arc-extinguishing part 134 includes a support plate (not marked) and a grid plate 1341.

[0108] Multiple support plates may be provided. The multiple support plates are configured to be separate from each other and facing each other, and support grid plates 1341 on both sides.

[0109] The grid plate 1341 applies a magnetic force to the generated electric arc A. The generated electric arc A is extinguished as it passes between the grid plates 1341 by the magnetic force applied by the grid plate 1341 and discharged to the outside of the wiring circuit breaker 10.

[0110] The grid 1341 is formed of a magnetic material. This is to cause the generated arc A to flow toward the arc outlet by applying an attractive force to the arc A, which is a flow of electrons.

[0111] The grid plate 1341 may have a defined space formed on the side facing the movable contact 133. The movable contact 133 can rotate when passing through the space. The rotation path of the movable contact 133 is located between the grid plates 1341. Thus, the electric arc A can be guided by the grid plates 1341.

[0112] A plurality of grid plates 1341 may be provided. The plurality of grid plates 1341 are separated from each other and stacked. The generated electric arc A is extinguished and moved through the space formed between the grid plates 1341.

[0113] like Figure 4 As shown, a plurality of grid plates 1341 can be stacked vertically and can be stacked at an angle according to the position of the passage for discharging the electric arc A. Thus, the electric arc A can pass through the space between the plurality of grid plates 1341 and can move smoothly toward the passage for discharging the electric arc A.

[0114] On the other hand, due to the high temperature and high voltage arc A generated when the abnormal current (fault current) is cut off, oxides are generated inside the base cover 131 of the base assembly 13, and the inside of the base cover 131 may be contaminated by the oxides.

[0115] Furthermore, due to the high temperature and high pressure of the electric arc A, the first base cover 1311 and the second base cover 1312 of the base cover 131 may open up, resulting in a gap between the first base cover 1311 and the second base cover 1312. Oxides formed inside the base cover 131 can flow out from the gap and into the interior of the housing 12 of the wiring circuit breaker 10.

[0116] The interior of housing 12 may be contaminated by the incoming oxides, which may reduce the insulation performance of housing 12. The insulation of the interior of housing 12 may be compromised by the reaction of the incoming oxides. Therefore, even if the interior of housing 12 is contaminated by incoming oxides, it is necessary to maintain the insulation performance of housing 12 at a constant level.

[0117] To maintain a constant insulation performance of the housing 12 or to further improve the insulation performance of the housing 12, the inner surface of the housing 12 of the present invention is coated with an insulating material. Here, insulating coating means that the inner surface of the housing 12 is coated with an insulating material.

[0118] By insulating the inner surface of the housing 12, the inner surface of the housing 12 can be protected from contaminants such as oxides flowing out from the base cover 131, thereby maintaining the insulation performance of the housing 12 at a constant level.

[0119] Furthermore, since the oxide does not flow into the interior of the housing 12, the insulation performance of the housing 12 is further improved because the inner surface of the housing 12 is coated with an insulating material.

[0120] Figure 6 This is a diagram showing the housing 12 of the wiring circuit breaker of the present invention. Figure 7 It is shown Figure 6 A cross-sectional view of the housing 12.

[0121] Reference Figure 6 and Figure 7 The wiring circuit breaker 10 of the present invention includes an insulating coating portion 14.

[0122] The insulating coating 14 is formed inside the housing 12 of the wiring circuit breaker 10 of the present invention. The insulating coating 14 serves to further improve the insulation performance of the housing 12.

[0123] An insulating coating portion 14 is formed on the inner surface of the housing 12 facing the outer surface of the base cover 131 when the base cover 131 is inserted into the housing 12. The insulating coating portion 14 is formed by coating the inner surface of the housing 12 with an insulating material.

[0124] Specifically, the insulating coating 14 is formed on the inner surface of at least one of the bottom 121, one side wall 124, and the other side wall 125 of the housing 12.

[0125] If the base cover 131 of the base assembly 13 is housed within the housing 12 of the wiring circuit breaker 10, the inner surface of the housing 12 and the outer surface of the base cover 131 face each other. The insulating coating 14 serves to fill any space (gap) that may be created between the inner surface of the housing 12 and the outer surface of the base cover 131.

[0126] Therefore, even if a gap is formed between the first base cover 1311 and the second base cover 1312, the insulating coating portion 14 can prevent contaminants such as oxides from flowing out of the gap by filling the gap.

[0127] Furthermore, even if contaminants such as oxides flow out between the first base cover 1311 and the second base cover 1312, the contaminants cannot come into contact with the inner surface of the housing 12 due to the insulating coating portion 14.

[0128] The insulating coating 14 is formed of an insulating material. Specifically, the insulating coating 14 may be formed of any one or a mixture of more than one of silicone, polyurethane, polyamide, acrylic, and epoxy materials.

[0129] The insulating coating 14 can be formed by coating the aforementioned material by spraying or brushing.

[0130] The spraying method refers to spraying (spreading) the aforementioned liquid material onto the bottom 121, one side wall 124, and the inner surface of the other side wall 125 of the housing 12 by means of pumping or spraying nozzles.

[0131] The brushing method refers to using a brush to apply the aforementioned liquid material to the bottom 121, one side wall 124, and the inner surface of the other side wall 125 of the housing 12.

[0132] The material of the insulating coating 14 can be flexible after curing.

[0133] The thickness D of the insulating coating 14 can be 15μm to 50μm.

[0134] If the base cover 131 of the base assembly 13 is housed in the housing 12 of the wiring circuit breaker 10, the inner surface of the bottom 121 of the housing 12 and the outer surface of the bottom 121 of the base cover 131 face each other.

[0135] When the thickness D of the insulating coating 14 is less than 15 μm, a space is formed between the inner surface of the bottom 121 of the housing 12 and the outer surface of the bottom 121 of the base cover 131, where contaminants such as oxides accumulate. Therefore, by making the thickness of the insulating coating 14 15 μm or more, the space between the inner surface of the bottom 121 of the housing 12 and the outer surface of the bottom 121 of the base cover 131 is eliminated. This can also be applied similarly to the inner surfaces of one side wall portion 124 and the other side wall portion 125 of the housing 12 and the outer surfaces of the respective side walls of the base cover 131 facing each other.

[0136] Furthermore, when the thickness D of the insulating coating 14 is greater than 50 μm, if the base cover 131 of the base assembly 13 is housed within the housing 12 of the wiring circuit breaker 10, assembly tolerances arise where the base cover 131 cannot be positioned correctly due to the thickness of the insulating coating 14. Therefore, when assembling the housing cover 11 into the housing 12 of the wiring circuit breaker 10, the base cover 131 of the base assembly 13 is interfered with, leading to assembly difficulties. In addition, the thickness of the insulating coating 14 formed on the inner surfaces of one side wall portion 124 and the other side wall portion 125 of the housing 12 also makes it difficult to insert the base cover 131.

[0137] In addition, according to an example of an embodiment of the present invention, different chemical substances can be coated on the inner surface of the housing 12 of the wiring circuit breaker 10 and the outer surface of the base cover 131 of the base assembly 13, and the base assembly 13 can be assembled to the housing 12. Then, after a predetermined time, chemical reactions between the different chemical substances are carried out, thereby producing the insulating coating part 14 formed of insulating material.

[0138] The features, structures, and effects described in the above embodiments belong to at least one embodiment of the present invention, but are not necessarily limited to only one embodiment. Furthermore, those skilled in the art can combine or modify the features, structures, and effects exemplified in each embodiment to implement other embodiments. Therefore, it should be understood that the content related to such combinations and modifications falls within the scope of the present invention.

[0139] Furthermore, the above description focuses on the implementation state, but this is merely an example and not a limitation of the invention. Those skilled in the art will understand that various modifications and applications not illustrated can be made without departing from the essential characteristics of this implementation state. That is, the specific constituent elements appearing in the implementation state can be modified. Moreover, it should be understood that any differences related to such modifications and applications fall within the scope of the invention as defined in the claims.

Claims

1. A circuit breaker for wiring, wherein, include: case; A housing cover, which covers the housing; as well as A plurality of base assemblies are housed in the housing; The base assembly has a base cover, which has an internal space to accommodate a fixed contact, a movable contact, and an arc-extinguishing part. An insulating coating is formed on the inner surface of the housing, and the inner surface of the housing faces the outer surface of the base cover when the base cover is inserted into the housing; The insulating coating is formed by coating the inner surface of the housing with an insulating material.

2. The circuit breaker for wiring according to claim 1, wherein, The insulating coating is formed on the inner surface of at least one of the bottom of the housing, one side wall of the housing, and the other side wall of the housing.

3. The circuit breaker for wiring according to claim 1, wherein, The insulating coating is formed from any one or a mixture of more than one of silicone, polyurethane, polyamide, acrylic, and epoxy materials.

4. The circuit breaker for wiring according to claim 3, wherein, The insulating coating is formed by spraying or brushing.

5. The circuit breaker for wiring according to claim 1, wherein, The thickness of the insulating coating is 15μm to 50μm.

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