Circuit breaker for wiring

Abstract

The present invention relates to a circuit breaker for wiring, and more particularly, to a circuit breaker for wiring in which the insulation performance of a base assembly is improved. According to the circuit breaker for wiring in each embodiment of the invention, two molded objects forming a base shell are provided with leakage prevention parts which protrude downwards along contact surfaces of bottom surfaces, and a leakage prevention combination part which is used as a groove and is used for insertion and combination of the leakage prevention parts is formed at the bottom of a shell, so that the leakage prevention parts are engaged with the leakage prevention combination part; therefore, the base shell is prevented from being opened.

Description

Technical Field

[0001] This invention relates to a wiring circuit breaker, and more specifically, to a wiring circuit breaker with improved insulation performance of the base assembly. Background Technology

[0002] Typically, a wiring circuit breaker (MCCB: Molded Case Circuit Breaker) is an electrical device that automatically disconnects the circuit to protect the circuit and load in the event of an electrical overload or short circuit fault.

[0003] A wiring circuit breaker generally consists of a terminal section that can be connected to the power supply side or the load side, a contact section including a fixed contact and a movable contact that connects or disconnects the circuit by contacting or separating from the fixed contact, a switching mechanism that provides the power required to open or close the circuit by moving the movable contact, a tripping section that detects the overcurrent or short-circuit current flowing in the circuit to guide the tripping action of the switching mechanism, and an arc extinguishing section for extinguishing the arc generated when an abnormal current is disconnected.

[0004] Figure 1 A prior art wiring circuit breaker is shown. Figure 2 The internal structure of a conventional wiring circuit breaker is shown when cut longitudinally.

[0005] The prior art wiring circuit breaker 10 includes the following components: a fixed contact 21 and a movable contact 22, with a contact portion formed inside a case 11 and a cover 12, which are enclosures made of insulating material, the contact portion being configured to connect or disconnect a circuit transmitted from the power supply side to the load side; an opening and closing mechanism 40, providing power to rotate the movable contact 22; an arc extinguishing section 30, configured to extinguish an electric arc generated when interrupting a fault current; and a tripping section 50, used to detect abnormal current and trip the opening and closing mechanism.

[0006] In addition, terminal portions 15 for connecting the circuit to a power source or load are provided at both ends of the housings 11 and 12.

[0007] On the other hand, the contact parts 21, 22 and the arc extinguishing part 30 are separately housed in the base assembly 20 disposed inside the housing 11.

[0008] If a fault current flows in the circuit, the tripping section 50 detects the fault current and performs a tripping operation that causes the opening and closing mechanism section 40 to operate, thereby separating the movable contact 22 from the fixed contact 21 and cutting off the flow of current. At this time, an electric arc A is generated in the contact sections 21 and 22.

[0009] At this point, the size (intensity) of the electric arc is proportional to the magnitude of the current. An electric arc refers to the phenomenon where atmospheric gas instantaneously reaches a plasma state under the influence of voltage. The center temperature of the arc reaches 8,000–12,000°C and exhibits explosive expansion pressure. Therefore, it has the characteristic of melting, consuming, deteriorating, and damaging surrounding components at the contact points 21 and 22. Consequently, the continuity of the electric arc has a significant impact on the performance and durability of the circuit breaker. Therefore, the electric arc needs to be rapidly blocked, extinguished, and discharged within the arc-extinguishing section 30.

[0010] Thus, in wiring circuit breakers, the task of handling the arc when a fault current is generated becomes the main objective of interrupting the fault current and protecting products, loads, and lines, and has a direct impact on the performance of the circuit breaker.

[0011] The base assembly 20 operates as follows when the fault current is cut off. Figure 3 The base assembly 20 is shown.

[0012] If a fault current occurs, the opening and closing mechanism 40 operates under the action of the tripping section 50, causing the shaft 26 to rotate clockwise around the shaft 25. At this time, an electric arc is generated at the contact sections 21 and 22. The arc moves towards the grid plate 31 in the arc extinguishing section (arc chamber) 30 and is extinguished by being segmented and cooled. As the arc moves along the grid plate 31, the arc voltage increases, and eventually the arc is extinguished.

[0013] In a wiring circuit breaker, successful interruption depends on rapid arc extinguishing. That is, the rotational speed of the shaft 26 needs to be fast, and the generated arc needs to spread rapidly to the grid plate 31 to increase the arc voltage.

[0014] The arc A generated by the fault current in the contact portions 21 and 22 is discharged between the grid plates 31 of the arc extinguishing portion 30 and through the exhaust port 29 of the base housing 28. Afterwards, it is released to the outside through the exhaust pipe 19 at the lower part of the terminal portion 15.

[0015] Figure 4 A perspective view of the housing 11 and base assembly 20 of a prior art wiring circuit breaker is shown. The view is presented from above, tilted towards the power supply side.

[0016] Within the housing 11, each phase is provided with a base assembly 20. In the case of a three-phase system, three base assemblies 20 are provided. An opening / closing mechanism 40 is disposed in the middle phase (e.g., phase S in R, S, and T phases). Power from the opening / closing mechanism 40 is transmitted to each phase via a rotating pin 43 that spans all phases. That is, power from the opening / closing mechanism 40 causes all phases to move together via the rotating pin 43.

[0017] Figure 5 A perspective view of the base assembly from another side is shown. Figure 6 It is along Figure 1 A three-dimensional diagram of the aa line cut longitudinally.

[0018] The base housing 28 of the base assembly 20 is formed from a synthetic resin molded material. That is, the base housing 28 is manufactured in two parts, left and right, and then assembled after the internal components are installed. It is formed by combining one side base housing 28a and the other side base housing 28b.

[0019] Figure 7 A perspective view of the housing 11 is shown.

[0020] A base assembly 20 is provided on the bottom part 16 of the housing 11.

[0021] However, the problem with the existing base housing 28 is that, during cutting, such as Figure 5 As shown, the base housing 28 opens to the left and right due to the high pressure of the electric arc, and metal oxides flow out from the gaps opened by the base housing 28, contaminating the interior of the housing 11 and reducing its internal insulation performance. Summary of the Invention

[0022] The problem that the invention aims to solve

[0023] The present invention is proposed to solve the above-mentioned problems, and its purpose is to provide a wiring circuit breaker that prevents the base assembly housing from opening due to the arc pressure generated during cutting.

[0024] Technical solutions to the problem

[0025] A wiring circuit breaker according to one aspect of the present invention includes: a housing for the wiring circuit breaker; and a base housing disposed inside the housing to accommodate a contact portion and an arc-extinguishing portion; a leak-proof portion is formed protruding from the bottom surface of the base housing, and a leak-proof coupling portion is formed at the bottom of the housing as a groove for the leak-proof portion to be inserted and engaged.

[0026] Here, the leak-proof part is formed along the length direction on the bottom surface of the base housing.

[0027] In addition, the base housing is composed of a first main body of the base housing that accommodates the contact part and the arc extinguishing part, and a second main body of the base housing that is combined with the first main body of the base housing.

[0028] In addition, the leak-proof part is formed at the part where the first body of the base housing and the second body of the base housing are connected to each other.

[0029] In addition, the leak-proof part is composed of a first leak-proof part body formed on the first body of the base housing and a second leak-proof part body formed on the second body of the base housing.

[0030] In addition, the first body of the leak-proof part is formed on the side that is in contact with the second body of the base shell, and the second body of the leak-proof part is formed on the side that is in contact with the first body of the base shell.

[0031] In addition, the leak-proof joint is formed at the bottom of the outer casing along the central axis of each phase.

[0032] In addition, the leak-proof joint is formed across the power supply side exhaust pipe and the load side exhaust pipe of the housing.

[0033] In addition, ribs are formed between the leak-proof joint and the exhaust pipe of the terminal to enhance strength.

[0034] In addition, the leak-proof part has a partially cut-out section in the middle.

[0035] In addition, the leak-proof joint has a cut portion in the middle that is parallel to the bottom.

[0036] In addition, a side leak-proof part is formed protruding on the side of the base shell.

[0037] In addition, a side leak-proof joint is formed in the outer casing for engaging with the side leak-proof part.

[0038] In addition, the side leak-proof part is composed of a first body of the side leak-proof part formed on the first body of the base housing and a second body of the side leak-proof part formed on the second body of the base housing.

[0039] Furthermore, a partially cut groove is provided on the contact surface of one of the first and second leak-proof bodies, and a protrusion is provided on the contact surface of the other of the first and second leak-proof bodies, which protrudes toward one of the first and second leak-proof bodies and is inserted into the groove.

[0040] Invention Effects

[0041] According to various embodiments of the present invention, in a wiring circuit breaker, two molded parts constituting the base housing protrude downward along the contact surface of the bottom surface to form a leak-proof part, and a leak-proof joint part is formed at the bottom of the housing as a groove for the leak-proof part to be inserted and engaged, thereby making the leak-proof part engage with the leak-proof joint part and thus preventing the base housing from opening.

[0042] Therefore, even when the arc is blocked, the pressure generated by the arc gas will not cause the base shell to open, thus preventing the metal oxide from flowing out.

[0043] Therefore, it is necessary to prevent contamination inside the casing and to prevent a decrease in insulation performance. Attached Figure Description

[0044] Figures 1 to 7 A prior art wiring circuit breaker is shown.

[0045] Figure 1 This is a 3D diagram of a circuit breaker used for wiring.

[0046] Figure 2 This is a perspective view showing the internal structure of a circuit breaker that cuts through the wiring longitudinally.

[0047] Figure 3 This is a diagram of the internal structure of the base assembly.

[0048] Figure 4 It is a 3D view of the base assembly and the housing.

[0049] Figure 5 This is a 3D view of the base assembly.

[0050] Figure 6 It is along Figure 1 A three-dimensional diagram of the aa line cut longitudinally.

[0051] Figure 7 This is a 3D view of the shell.

[0052] Figures 8 to 14 A wiring circuit breaker according to an embodiment of the present invention is shown.

[0053] Figure 8 This is a 3D view of a wiring circuit breaker. It is shown as a cut along the length and longitudinal direction.

[0054] Figure 9 This is a 3D view of the base assembly.

[0055] Figure 10 This is a 3D view of the shell.

[0056] Figure 11 This is a 3D view of a wiring circuit breaker. It is shown as a cut along the width and longitudinal direction.

[0057] Figure 12 This is a perspective view of the base assembly and opening / closing mechanism of another embodiment.

[0058] Figure 13 This is a perspective view of the housing according to another embodiment.

[0059] Figure 14 This is a perspective view of the housing and trip unit housing of another embodiment. Detailed Implementation

[0060] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. However, this is intended to provide a detailed description so that those skilled in the art can readily implement the invention, and is not intended to limit the technical concept and scope of the invention to these drawings.

[0061] In this invention, terms such as "component" or "part" used to refer to constituent elements are not for limiting purposes and may be omitted.

[0062] Figure 8 This is a 3D view of a wiring circuit breaker. It is shown as a cut along the length and longitudinal direction. Figure 9 This is a 3D view of the base assembly. Figure 10 This is a 3D view of the shell. Figure 11 This is a perspective view of a wiring circuit breaker. It is shown as a cut along both the width and longitudinal directions. Referring to the accompanying drawings, the wiring circuit breakers of various embodiments of the present invention will be described in detail.

[0063] A wiring circuit breaker according to an embodiment of the present invention is characterized in that it includes: housings 101 and 110 of the wiring circuit breaker; and a base assembly 170 disposed inside the housings 101 and 110, accommodating a contact portion and an arc-extinguishing portion; a leakage-proof portion 173 is formed protruding from the bottom surface of the base assembly 170, and a groove is formed at the bottom 111 of the housings 101 and 110 as a leakage-proof connection portion 113 for the leakage-proof portion 173 to be inserted and connected.

[0064] Housings 101 and 110 house and support the components of the wiring circuit breaker. Housings 101 and 110 are generally box-shaped. A handle 141 of the opening and closing mechanism 140 is exposed on the top surface of housings 101 and 110. The handle 141 actuates the opening and closing mechanism 140 by the user's manual operation.

[0065] The outer casings 101 and 110 are formed of an insulating material. The outer casings 101 and 110 may be composed of a housing 110 disposed at the lower part and a cover 101 covering the upper part of the housing. On the other hand, an upper cover 103 is provided at the upper center of the cover 101.

[0066] Terminal portions 130 and 135, which can be connected to a power source or a load, are provided on the front and back of the housings 101 and 110. The terminal portions 130 and 135 are composed of a power source side terminal portion 130 and a load side terminal portion 135.

[0067] Terminal sections 130 and 135 are provided for each phase (or each pole). For example, in the case of a three-phase circuit breaker, three terminal sections can be provided on the power supply side and the load side respectively.

[0068] Terminals 131 and 136 are provided in terminal portions 130 and 135, respectively. A power-side terminal 131 connected to a power supply circuit is provided in the power supply terminal portion 130, and a load-side terminal 136 connected to a load circuit is provided in the load-side terminal portion 135. Each terminal 131 and 136 is connected to fixed contacts 132 and 133, respectively.

[0069] Terminal exhaust pipes 119 for discharging arc gas to the outside are provided at the lower ends of terminal portions 130 and 135. The terminal exhaust pipes 119 are respectively provided on both sides for each phase. Each terminal exhaust pipe 119 can be connected to the terminal exhaust pipe 119 of the adjacent phase.

[0070] A tripping section 160, used to detect abnormal current flowing through the circuit and trip the switching mechanism, is provided in a part of the housings 101 and 110. The tripping section 160 is typically located on the load side.

[0071] The main function of the tripping section 160 of the wiring circuit breaker is to detect fault current and short-circuit current and to disconnect the switching mechanism section 140 to protect the load and the line. The tripping section 160 is classified into mechanical tripping sections and electronic tripping sections according to the tripping method.

[0072] Mechanical tripping mechanisms include thermodynamic types that operate by the deformation of the conductor caused by the current flowing through it and the conductor's resistance, and electromagnetic types that operate based on changes in magnetic flux density. Thermodynamic tripping mechanisms are typically represented by bimetallic strips, while electromagnetic tripping mechanisms are typically represented by magnets and armatures.

[0073] An electronic trip unit uses a sensor that detects the current flowing through the circuit to activate the mechanism. Electronic tripping measures the current flowing through the conductor to activate the mechanism on a control panel.

[0074] The thermal type is a mechanism that breaks the conductor by deformation caused by the current flowing through the conductor and the conductor's resistance.

[0075] Figure 8 The embodiments provide examples of mechanical tripping units that combine thermal tripping mechanisms and electromagnetic tripping mechanisms.

[0076] The tripping section may include: a heater 161 connected to the load-side terminal 135; a bimetallic strip 162 coupled to the heater 161, which detects heat and bends according to the heat; a magnet 163 and an armature 164 disposed around the heater 161; a crossbar 165 configured to rotate by contact of the bimetallic strip 162 or the armature 164; and a push rod 166 which is restricted or released by the rotation of the crossbar 165, thereby restricting or releasing the locking pin 147 of the opening and closing mechanism 140.

[0077] Normally, when a small current is delayed and cut off, the bimetallic strip 162 is bent by the heat generated by the heater 161, and the crossbar 165 rotates to operate the opening and closing mechanism 140. When a large current is instantaneously cut off, the crossbar 165 rotates as the armature 164 is attracted by the magnetic force generated by the magnet 163, thereby operating the opening and closing mechanism 140.

[0078] The user's operating force is transmitted to the opening / closing mechanism 140 via the handle 141. In order to transmit the power of the opening / closing mechanism 140 to each phase, a pair of rotating pins 145 are provided in the opening / closing mechanism 140. The rotating pins 145 are formed to span the length of all phases and are provided in the shaft assembly (or movable assembly) 120.

[0079] A base assembly 170 is provided. The base assembly 170 has a contact portion and an arc-extinguishing portion. The base assembly 170 is provided in each phase.

[0080] A base assembly housing (hereinafter referred to as the base housing) 179 is provided. The base housing 171 can be formed by injection molding. The base housing 171 is generally formed in the shape of a box. Contact portions 132, 133, 122, 123 and arc extinguishing portion 150 are provided in the base housing 171. An opening and closing mechanism portion 140 is provided on the upper part of the base housing 171.

[0081] It is equipped with contact parts (fixed contacts and movable contacts). The contact parts are the parts of the circuit that actually connect or disconnect.

[0082] Fixed contacts 132 and 133 are disposed inside housings 101 and 110. Specifically, fixed contacts 132 and 133 and movable contacts 122 and 123 are mounted inside base assemblies 170 provided in each phase. Fixed contacts 132 and 133 are connected to terminal portions 130 and 135.

[0083] Fixed contacts 132a and 133a are provided on the fixed contacts 132 and 133. The fixed contacts 132a and 133a can be made of materials with excellent conductivity and durability, such as silver (Ag) alloy.

[0084] In the case of a double-contact circuit breaker, fixed contacts 132 and 133 are respectively provided on the power supply side and the load side. That is, a power supply side fixed contact 132 and a load side fixed contact 133 are provided. In this case, the power supply side fixed contact 132 can be directly connected to the power supply side terminal 130 or integrated into it. The load side fixed contact 133 can be connected to the load side terminal 135 through a tripping mechanism (especially a heater 161).

[0085] An arc-extinguishing section (arc-extinguishing device, arc chamber) 150 is provided near the contact section (fixed contact and movable contact) to extinguish the arc generated when the circuit is disconnected. In the case of a two-contact type wiring circuit breaker, the arc-extinguishing section 150 is provided on both the power supply side and the load side. The arc-extinguishing section 150 includes a pair of side plates 151, 152 and a plurality of grid plates 155 connected to the side plates 151, 152 at predetermined intervals.

[0086] A shaft assembly 120 is provided. A rotating pin 145 is provided through the shaft assembly 120. The shaft assembly 120 receives the opening and closing power of the opening and closing mechanism 140 via the rotating pin 145 and rotates accordingly. As the shaft assembly 120 rotates, the movable contacts 122 and 123 also rotate, thereby contacting or separating from the fixed contacts 132 and 133.

[0087] The shaft assembly 120 comprises a shaft body 121 and movable contacts 122 and 123.

[0088] The shaft body 121 is formed in the shape of a cylinder or cylindrical body. Shafts 125 are formed protruding from the two flat sides (disc surfaces) of the shaft body 121. A pair of pin holes 129 are formed in the shaft body 121, which pass through parallel to the direction of the shafts 125, and can be used to insert rotating pins 145.

[0089] Movable contacts 122 and 123 are rotatably mounted on the shaft body 121. The movable contacts 122 and 123 rotate together with the shaft body 121 or individually in a counterclockwise or clockwise direction and come into contact with or separate from the fixed contacts 132 and 133, thereby energizing or disconnecting the circuit.

[0090] Movable contacts 122a and 123a are respectively provided at both ends of the movable contacts 122 and 123, which can contact the fixed contacts 132a and 133a of the fixed contacts 132 and 133. The movable contacts 122a and 123a can be made of materials with excellent conductivity and durability, such as silver (Ag) alloy.

[0091] A contact pressure spring 126 is provided inside the shaft body 121 to provide contact pressure to the movable contacts 122 and 123. The contact pressure spring 126 is installed between the movable contacts 122 and 123 and the shaft pin 127 located inside the shaft body 121. When the movable contacts 122 and 123 are in contact with the fixed contacts 122 and 123, the contact pressure spring 126 makes it difficult for the movable contacts 122 and 123 to separate from the fixed contacts 122 and 123.

[0092] The movable contacts 122 and 123 rotate together with the shaft body 121 under normal low-current or high-current interruption conditions. However, during current-limiting interruption, due to the rapid electrodynamic repulsion, the movable contacts 122 and 123 overcome the force of the contact pressure spring 126 and rotate independently. In this case, the movable contacts 122 and 123 contact the other shaft pin 127 of the shaft body 121 and stop rotating.

[0093] An arc-extinguishing section 150 is provided to extinguish the electric arc generated during disconnection. The arc-extinguishing section 150 is disposed inside the base assembly 170. The arc-extinguishing section 150 is disposed adjacent to the contact portions of the fixed contacts 132, 133 and the movable contacts 122, 123.

[0094] The arc-extinguishing section 150 includes: side plates 151 and 152, symmetrically opposite each other to form a pair of sidewalls; and grid plates 155, formed of a plurality of iron plates, inserted side-by-side at predetermined intervals into the side plates 151 and 152. A plurality of grid plates 155 can be provided, and the side plates 151 and 152 can be arranged in multiple layers with predetermined intervals. Thus, a passageway for the electric arc to flow is provided between each grid plate 155. The spacing of the stacked grid plates 155 can be appropriately set considering the segmentation and suction force of the electric arc.

[0095] The arc-extinguishing section is surrounded by side plates 151, 152 and grid plates 155, forming an internal space capable of extinguishing the electric arc. The arc-extinguishing section is also called the arc chamber.

[0096] Under normal circuit conditions, the fixed contacts 132a and 133a of the fixed contacts 132 and 133 are connected to the movable contacts 122a and 123a of the movable contacts 122 and 123, allowing current to flow. When a fault current occurs in the circuit, the movable contacts 122 and 123 are rotated by the mechanism 107, causing the movable contacts 122a and 123a to separate from the fixed contacts 132a and 133a, thereby interrupting the current. At this time, an electric arc is generated between the movable contacts 122a and 123a and the fixed contacts 132a and 133a. This arc enters between the individual grid plates 155 and is divided into short arcs, increasing the arc voltage. Furthermore, the arc voltage is further increased by the arc-extinguishing gas, such as SF6, present in the arc-extinguishing section. Thus, the arc is suppressed and extinguished as free electrons are released. Afterwards, the arc gas is discharged to the outside through the exhaust section 179 of the base housing 171 and the exhaust pipe 119 of the housing 110.

[0097] Exhaust ports 179 are formed at both ends of the base housing 171. The exhaust ports 179 are formed as pipes or holes connected to the outside in a part of the base housing 171. In particular, the exhaust port 179 disposed on the load side is connected from the arc extinguishing part 150 to the exhaust pipe 119 of the housing 110. The exhaust port 179 is formed to a predetermined length.

[0098] Terminal mounting parts 180 for mounting power or load terminals are provided in terminal parts 130 and 135.

[0099] The terminal mounting member 180 is inserted into the exhaust pipe 119. For this purpose, insertion slots 181 are formed on both sides of the terminal mounting member 180. Preferably, the insertion slots 181 are shaped to correspond to the shape of the terminal exhaust pipe 119. Typically, the terminal exhaust pipe 119 has a rectangular cross-section; therefore, preferably, the insertion slots 181 are quadrilateral.

[0100] Detailed description of base assembly 170. Figure 9 The base assembly 170 is shown. The base assembly 170 consists of a base housing 171 and contact portions 120, 132, 132 and arc-extinguishing portion 150 built into the base housing 171. Here, the contact portions 120, 132, 132 and arc-extinguishing portion 150 are as described above.

[0101] An operating hole 172 is formed on the side of the base housing 171, which enables the rotating pin 145 to move. A portion of the shaft assembly 120 is exposed through the operating hole 172.

[0102] The base housing 171 has an exhaust portion 179 for venting the electric arc generated during the cutting process. The exhaust portion 179 is formed on both sides of the base housing 171, that is, on the power supply side and the load side. Here, the exhaust portion 179 on the power supply side can be provided on the upper part of the base housing 171, and the exhaust portion 179 on the load side can be provided on the lower part of the base housing 171.

[0103] The base housing 171 exposes a power supply side terminal 131, and on the other side exposes a load side fixed contact 133 that connects to the load side terminal portion 136. Here, the power supply side terminal 131 can be disposed on the lower part of the base housing 171, and the load side fixed contact 133 can be disposed on the upper part of the base housing 171.

[0104] The base housing 171, as a synthetic resin molded material, is divided into two molded parts, with contact portions 120, 132, 132 and arc-extinguishing portions 150 internally arranged. That is, the contact portions 120, 132, 132 and arc-extinguishing portions 150 are arranged within the first molded part, and the second molded part is combined and assembled with the first molded part. The two molded parts are typically configured to divide the base housing 171 in half along its length. These two molded parts are distinguished as a first base housing body 171a and a second base housing body 171b.

[0105] The first body 171a and the second body 171b of the base housing are joined together by a threaded connection. For this purpose, a plurality of fastening members 191 are provided.

[0106] To prevent arc gas from leaking through gaps that may be formed between the first body 171a and the second body 171b of the base housing, a leak-proof part 173 is provided.

[0107] Leak-proof part 173 is formed along the length direction on the bottom surface of the base housing 171.

[0108] Leak-proof section 173 is provided at the junction of the first body 171a and the second body 171b of the base housing. Arc gas leaks as the junction of the first body 171a and the second body 171b of the base housing opens up due to arc pressure. Therefore, opening up is prevented by reinforcing the junction of the first body 171a and the second body 171b of the base housing.

[0109] The leak-proof part 173 is composed of a leak-proof part first body 173a formed on the first body 171a of the base shell and a leak-proof part second body 173b formed on the second body 171b of the base shell.

[0110] That is, the first leak-proof part 173a is formed on the inner side of the first body 171a of the base shell (the side that contacts the second body), and the second leak-proof part 173b is formed on the inner side of the second body 171b of the base shell (the side that contacts the first body). Therefore, the cross-section of the bottom part of the base shell 171 is T-shaped due to the leak-proof part 173 (see reference). Figure 11 , Figure 12 ).

[0111] A leak-proof connection portion 113 is provided at the bottom 111 of the housing 110 for the leak-proof portion 173 of the base housing 171 to be inserted and engaged. The leak-proof connection portion 113 is formed as a groove for the leak-proof portion 173 to be inserted and engaged.

[0112] A leak-proof joint 113 is formed along the length of the bottom 111 of the housing 110. The leak-proof joint 113 can be provided in each phase. Here, the leak-proof joint 113 can be formed along the central axis of each phase.

[0113] The leak-proof joint 113 is formed across the power supply side exhaust pipe 119a and the load side exhaust pipe 119b of the housing 110. That is, it can be formed above the length direction of the base assembly 170. When the base assembly 170 is assembled to the housing 110, the leak-proof joint 113 also functions as an assembly groove, thereby helping to facilitate assembly.

[0114] On the other hand, a rib 114 can be formed between the leak-proof joint 113 and the exhaust pipe 119 of the terminal to enhance strength.

[0115] According to an embodiment of the present invention, a circuit breaker for wiring has a leak-proof portion 173 protruding from the contact surface of the bottom surface of the base housing 171, and a leak-proof coupling portion 113, which serves as a groove for the leak-proof portion 173 to be inserted into the bottom 111 of the housing 110, thereby preventing the base housing from opening.

[0116] Therefore, even when the arc is cut off, the base shell does not open due to the pressure generated by the arc gas, so that the metal oxide does not flow out.

[0117] Therefore, it is necessary to prevent contamination inside the casing and to prevent a decrease in insulation performance.

[0118] Another embodiment of the present invention will be described.

[0119] Figure 12 A perspective view of the base assembly 170 and the opening / closing mechanism 140 is shown.

[0120] The opening and closing mechanism section 140 shows a handle 141 that allows the user to provide manual power, a rod 142 that is connected to the handle, a latch 143 that fixes the main spring, a latch bracket 144 that limits the latch, and a latch pin 147 that limits the latch bracket.

[0121] A leak-proof portion 173 is formed on the lower part of the base housing 171. However, the leak-proof portion 173 here has a cut-out portion 174 formed in the middle, which is a groove. That is, the middle part of the leak-proof portion 173 is cut off by the cut-out portion 174. Thus, the leak-proof portion 173 is divided into a first leak-proof joint portion 173-1 and a second leak-proof joint portion 173-2. The cut-out portion 174 can be formed directly on the flat part of the bottom surface where the leak-proof portion 173 is not formed, as in the prior art.

[0122] The first leak-proof joint 173-1 is composed of a first leak-proof joint first body 173a-1 and a first leak-proof joint second body 173b-1, and the second leak-proof joint 173-2 is composed of a second leak-proof joint first body 173a-2 and a second leak-proof joint second body 173b-2.

[0123] Figure 13 Another embodiment of the housing is shown.

[0124] The leak-proof joint 113 of the housing 110 is also divided into a first leak-proof joint 113-1 and a second leak-proof joint 113-2. A cutting portion 115 is provided between the first leak-proof joint 113-1 and the second leak-proof joint 113-2. The cutting portion 115 forms a plane parallel to the bottom 111 of the housing 110.

[0125] The first leak-proof part 173-1 of the base shell 171 is inserted into the first leak-proof joint part 113-1 of the shell 110, and the second leak-proof part 173-2 of the base shell 171 is inserted into the second leak-proof joint part 113-2 of the shell 110.

[0126] The leak-proof part 173 and the leak-proof joint 113 are provided in multiples. As the length of each leak-proof part decreases, the resistance generated by the electric arc pressure increases.

[0127] On the other hand, a side leak-proof portion 175 is provided on the side of the base housing 171. The side leak-proof portion 175 protrudes along the height direction of the side of the base housing 171. The side leak-proof portion 175 is composed of a side leak-proof portion first body 175a formed on the first body 171a of the base housing and a side leak-proof portion second body 175b formed on the second body 171b of the base housing.

[0128] Figure 14 A housing and a trip unit housing according to another embodiment of the present invention are shown.

[0129] The trip unit housing 105 can be configured on the load side. Here, an example of an electronic trip unit is given for the trip unit housing 105.

[0130] In the trip section housing 105, the side leak-proof joint 107 is formed as a groove in each phase. The side leak-proof joint 107 is joined with a side leak-proof part 175.

[0131] The side leakage parts 175 and 107, together with the leakage parts 173 and 113, increase the resistance to the electric arc pressure, thereby effectively preventing the base shell 171 from opening during cutting.

[0132] Reference Figure 12 This illustrates yet another embodiment of the present invention.

[0133] The leak-proof part 173A of this embodiment includes the features of the leak-proof part 173 of the previous embodiment.

[0134] The leak-proof part 173A is composed of a first leak-proof part 173a formed on the first body 171a of the base shell and a second leak-proof part 173b formed on the second body 171b of the base shell.

[0135] That is, the first leak-proof part 173a is formed on the inner side of the first body 171a of the base shell (the side that is in contact with the second body), and the second leak-proof part 173b is formed on the inner side of the second body 171b of the base shell (the side that is in contact with the first body). As a result, the cross-section of the bottom part of the base shell 171 is in the shape of a "T" due to the leak-proof part 173.

[0136] Here, overlapping portions (177: 177a, 177b) are provided on the contact surface of the leak-proof part 173A.

[0137] That is, the top surface of the contact surface of one of the leak-proof part first body 173a and leak-proof part second body 173b is provided with a partially cut groove 177a, and the top surface of the contact surface of the other of the leak-proof part first body 173a and leak-proof part second body 173b is provided with a partially protruding part 177b that protrudes to one side of the leak-proof part first body 173a and leak-proof part second body 173b.

[0138] Figure 12 An example is shown where a groove 177a is formed in the first body 173a of the leak-proof portion and a protrusion 177b is formed in the second body 173b of the leak-proof portion. In this case, the protrusion 177b of the second body 173b of the leak-proof portion is inserted into and joined to the groove 177a of the first body 173a of the leak-proof portion. The protrusion 177b and the groove 177a can be formed across the entire leak-proof portion 173A along its length.

[0139] The leak-proof portion 173A is formed by overlapping in the vertical direction. That is, compared with the previous embodiment where the first leak-proof portion body 173a and the second leak-proof portion body 173b are in contact in a straight line, in this embodiment, the first leak-proof portion body 173a and the second leak-proof portion body 173b are in contact in a stepped shape. Therefore, the resistance to the opening of the base housing 171 caused by the arc pressure generated inside the base housing 171 during cutting is further increased.

[0140] According to various embodiments of the present invention, in a wiring circuit breaker, two molded parts constituting the base housing protrude downward along the contact surface of the bottom surface to form a leak-proof part, and a leak-proof joint part is formed at the bottom of the housing as a groove for the leak-proof part to be inserted and engaged, thereby making the leak-proof part engage with the leak-proof joint part and thus preventing the base housing from opening.

[0141] Therefore, even when the arc is blocked, the pressure generated by the arc gas will not cause the base shell to open, thus preventing the metal oxide from flowing out.

[0142] Therefore, it is necessary to prevent contamination inside the casing and to prevent a decrease in insulation performance.

[0143] The embodiments described above are examples of implementing the present invention. Those skilled in the art can make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in this invention are not intended to limit the technical concept of the invention, but are merely illustrative. The scope of the technical concept of the invention is not limited by these embodiments. That is, the scope of protection of the present invention should be interpreted through the appended claims, and should be interpreted as including all technical concepts within the equivalent scope within the scope of the claims of the present invention.

[0144] Explanation of reference numerals in the attached figures

[0145] 101 Cover

[0146] 105 Trip section housing

[0147] 107 Side Leak-Proof Joint

[0148] 110 Casing

[0149] 111 Bottom

[0150] 113 Leak-proof joint

[0151] 115 Cutting Section

[0152] 120 axis assembly

[0153] Movable contacts 122 and 123

[0154] Terminal sections 130 and 135

[0155] 132, 133 Fixed contacts

[0156] 140 Opening and Closing Mechanism Department

[0157] 145 Rotary Pin

[0158] 150 Arc Extinguishing Section

[0159] 160 Trip Section

[0160] 170 base assembly

[0161] 171 Base Shell

[0162] 173 Leak-proof section

[0163] 174 Cutting section

[0164] 175 Side Leak-Proof Section

[0165] 177 Overlapping part

Claims

1. A circuit breaker for wiring, characterized in that, include: The casing of a circuit breaker for wiring; as well as The base housing is disposed inside the housing and accommodates the contact portion and the arc extinguishing portion; A leak-proof part is formed protruding from the bottom surface of the base shell. A leak-proof joint is formed at the bottom of the outer casing, which serves as a groove for the leak-proof part to be inserted and joined.

2. The circuit breaker for wiring according to claim 1, characterized in that, The leak-proof part is formed along the length direction on the bottom surface of the base shell.

3. The circuit breaker for wiring according to claim 1, characterized in that, The base housing is composed of a first main body of the base housing that accommodates the contact portion and the arc extinguishing portion, and a second main body of the base housing that is combined with the first main body of the base housing.

4. The circuit breaker for wiring according to claim 3, characterized in that, The leak-proof part is formed at the junction of the first body of the base housing and the second body of the base housing.

5. The circuit breaker for wiring according to claim 4, characterized in that, The leak-proof part is composed of a first leak-proof part body formed on the first body of the base housing and a second leak-proof part body formed on the second body of the base housing.

6. The circuit breaker for wiring according to claim 5, characterized in that, The first body of the leak-proof part is formed on the side that is in contact with the second body of the base shell. The second body of the leak-proof part is formed on the side that is in contact with the first body of the base shell.

7. The circuit breaker for wiring according to claim 1, characterized in that, The leak-proof joints are formed at the bottom of the outer casing along the central axis of each phase.

8. The circuit breaker for wiring according to claim 1, characterized in that, The leak-proof joint is formed across the power supply side exhaust pipe and the load side exhaust pipe of the housing.

9. The circuit breaker for wiring according to claim 1, characterized in that, Ribs are formed between the leak-proof joint and the exhaust pipe of the terminal to enhance strength.

10. The circuit breaker for wiring according to claim 1, characterized in that, The leak-proof part has a partially cut section in the middle.

11. The circuit breaker for wiring according to claim 1, characterized in that, The leak-proof joint has a cut portion in the middle that is parallel to the bottom.

12. The circuit breaker for wiring according to claim 3, characterized in that, A side leak-proof part is formed protruding on the side of the base housing.

13. The circuit breaker for wiring according to claim 12, characterized in that, The outer casing has a side leak-proof joint for engaging with the side leak-proof part.

14. The circuit breaker for wiring according to claim 13, characterized in that, The side leak-proof part is composed of a first body of the side leak-proof part formed on the first body of the base housing and a second body of the side leak-proof part formed on the second body of the base housing.

15. The circuit breaker for wiring according to claim 5, characterized in that, A partially cut groove is provided on the contact surface of one of the first and second bodies of the leak-proof part. A portion of the contact surface of the first body of the leak-proof part and the second body of the leak-proof part protrudes into one of the first body of the leak-proof part and is inserted into the groove.

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