Molded case circuit breaker having arc guide part

Abstract

The present invention relates to a molded case circuit breaker having an arc guide part and, more specifically, to a molded case circuit breaker having an arc guide part provided at a terminal part thereof to have improved insulation performance. In a molded case circuit breaker according to each embodiment of the present invention, an arc guide part is provided on a terminal part cover coupled to a terminal part so that arc is discharged to the outside without entering the terminal part.

Description

Circuit breaker with arc guide

[0001] The present invention relates to a circuit breaker for wiring having an arc guide portion, and more particularly, to a circuit breaker for wiring having improved insulation performance by providing an arc guide portion in a terminal portion.

[0002] In general, a molded case circuit breaker (MCCB) is an electrical device that automatically cuts off the circuit in the event of an electrical overload or short circuit to protect the circuit and load.

[0003] A circuit breaker for wiring is largely composed of a terminal portion that can be connected to the power source side or the load side, a contact portion that includes a fixed contactor and a movable contactor that makes contact with or separates the fixed contactor to connect or separate the circuit, a switching mechanism that provides power necessary to open and close the circuit by moving the movable contactor, a trip portion that detects overcurrent or short-circuit current flowing in the circuit and induces a trip operation of the switching mechanism, and an arc extinguishing portion that extinguishes an arc that occurs when an abnormal current is interrupted.

[0004] Fig. 1 illustrates a wiring circuit breaker according to the prior art. Fig. 2 illustrates the internal structure of a wiring circuit breaker according to the prior art by cutting it along the longitudinal direction.

[0005] A circuit breaker (10) according to the prior art includes a case (11) and a cover (12) which are enclosures formed of an insulating material, a fixed contactor (21) and a movable contactor (22) which constitute a contact portion for connecting or cutting off a circuit transmitted from a power source side to a load side, a switching mechanism (40) which provides power to rotate the movable contactor (22), an arc extinguishing unit (30) which is provided to extinguish an arc generated when an accident current is cut off, a trip unit (50) which detects an abnormal current and trips the switching mechanism, etc.

[0006] Additionally, terminals (15) are provided at both ends of the outer case (11, 12) to connect a circuit to a power source or load.

[0007] Meanwhile, the contact portion (21, 22) and the contact portion (30) are separately built into the base assembly (20) placed inside the case (11).

[0008] When a fault current flows in the circuit, the trip unit (50) detects this and operates the opening / closing mechanism (40) to separate the movable contactor (22) from the fixed contactor (21) and block the flow of current. At this time, an arc (A) occurs at the contactor (21, 22).

[0009] At this time, the size (strength) of the arc is proportional to the size of the current. The arc is a state in which gas in the atmosphere is instantaneously brought into a plasma state by voltage, and the temperature at the center of the arc reaches 8,000 to 12,000℃ and has explosive expansion pressure. As a result, it has the characteristic of melting and consuming the contact part (21, 22) and deteriorating and destroying the surrounding parts, so whether the arc lasts or not has a great impact on the performance and durability of the circuit breaker. Therefore, the arc must be quickly blocked, extinguished, and discharged within the arc extinguishing part (30).

[0010] In this way, in case of a circuit breaker for wiring, the task of handling the arc when a fault current occurs is the main goal in protecting the product, load, and line by blocking the fault current, and it directly affects the performance of the circuit breaker.

[0011] The operation of the base assembly (20) when the fault current is interrupted is as follows. The base assembly (20) is illustrated in Fig. 3.

[0012] When an accident current occurs, the opening / closing mechanism (40) is operated by the action of the trip unit (50), and accordingly, the shaft (26) rotates clockwise with respect to the axis (25). At this time, an arc is generated at the contact units (21, 22), and the arc is partially cooled and extinguished while moving to the grid (31) in the arc extinguishing unit (arc chamber) (30). As the arc moves along the grid (31), the arc voltage increases, and ultimately the arc is extinguished.

[0013] In a circuit breaker for wiring, the success of the circuit breaker depends on rapid arc extinguishment. That is, the rotation speed of the shaft (26) must be fast, and the generated arc must spread quickly to the grid (31) to increase the arc voltage.

[0014] An arc (A) generated at the contact point (21, 22) due to an accident current escapes between the grids (31) of the arc-extinguishing section (30) and exits through the exhaust port (29) of the base case (28). Thereafter, it passes through the branch port (18) and the exhaust pipe (19) at the bottom of the terminal section (15) and is discharged to the outside.

[0015] Figure 4 shows a detailed view of the arc extinguishing section and exhaust section of a wiring circuit breaker.

[0016] An external cable (50) is connected to the terminal portion (15). A cable terminal (52) of the external cable (50) is connected to the terminal (16) of the terminal portion (15). The cable is connected to the cable terminal (52) through the terminal connection portion (51).

[0017] In the case of circuit breakers of the prior art, when an arc is generated during a circuit breaker operation due to a fault current, the arc is converted into gas through the arc extinguishing section and emitted to the outside. However, the arc gas emitted to the outside may come into contact with a conductive object (cable terminal) or terminal conductor outside the circuit breaker, causing problems such as circuit breaker failure, insulation breakdown, or damage to other components.

[0018] The present invention has been devised to solve the above-mentioned problem, and its purpose is to provide a wiring circuit breaker having an arc guide portion to prevent an insulation breakdown phenomenon that may occur at a terminal portion during the process of discharging arc gas generated during blocking.

[0019] A circuit breaker according to one aspect of the present invention comprises: an outer case of the circuit breaker; and a terminal cover coupled to a terminal of the outer case, wherein the terminal cover is formed with an arc guide portion that is connected to an exhaust duct of the terminal portion and guides arc gas generated when the circuit breaker is interrupted.

[0020] Here, the exhaust ducts are provided on both sides of each phase.

[0021] In addition, the arc guide portion is composed of a guide plate extending horizontally to the terminal portion cover and a guide grid extending vertically from the guide plate.

[0022] In addition, the arc guide part is provided at one of the upper or lower terminal parts of one side of the outer case, and is provided at the other of the upper or lower terminal parts of the other side of the outer case.

[0023] In addition, the guide plate is formed so that the terminal portion on one side is inclined in one direction, either upward or downward, toward the outside, and the terminal portion on the other side is formed so that the guide plate is formed so that the terminal portion on the other side is inclined in the other direction, either upward or downward, toward the outside.

[0024] Additionally, the above guide plate is provided in the middle of each phase.

[0025] Additionally, the guide plate is formed in a 'V' shape so as to spread outward.

[0026] Additionally, the upper surface of the terminal cover is placed on the terminal and overlapped.

[0027] Additionally, a fastening member is coupled through the fastening hole of the terminal portion and the cover fastening hole of the terminal portion cover.

[0028] In addition, an assembly protrusion that fits into the assembly groove of the terminal portion is formed vertically on the inner end of the upper wall portion formed on the terminal portion cover.

[0029] According to the circuit breaker for wiring according to each embodiment of the present invention, an arc guide part is provided on the terminal part cover coupled to the terminal part so that the arc does not enter the terminal part but is discharged to the outside.

[0030] Specifically, the arc gas coming out of the exhaust duct of the terminal part flows downward by the guide plate of the terminal part cover and is dispersed to both side surfaces of each phase by the guide plate of the terminal part cover, thereby preventing movement to the terminal part and improving the insulation performance.

[0031] Therefore, insulation breakdown at the terminal is prevented.

[0032] Figures 1 to 4 illustrate a wiring circuit breaker according to the prior art.

[0033] Figure 1 is a perspective view of a circuit breaker for wiring.

[0034] Figure 2 is a perspective view showing the internal structure of a circuit breaker cut along the longitudinal direction.

[0035] Figure 3 is a diagram of the internal structure of the base assembly.

[0036] Figure 4 is a detailed drawing of the exhaust section in Figure 2.

[0037] Figures 5 to 14 illustrate a wiring circuit breaker according to one embodiment of the present invention.

[0038] FIG. 5 and FIG. 6 are perspective views of a wiring circuit breaker according to one embodiment of the present invention viewed from different directions.

[0039] Figure 7 is a perspective view showing the internal structure of a circuit breaker cut along the longitudinal direction.

[0040] Fig. 8 is a perspective view of the power side terminal cover removed from Fig. 6.

[0041] Figures 9 and 10 are perspective and side views of a circuit breaker for wiring, with the terminal cover cut off.

[0042] Figures 11 and 12 are perspective and front views of the load side terminal cover of the wiring circuit breaker.

[0043] Figures 13 and 14 are perspective and front views of the power side terminal cover of the wiring circuit breaker.

[0044] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, these drawings are intended to provide a detailed description sufficient to enable those skilled in the art to easily practice the invention, and are not intended to limit the technical spirit or scope of the present invention.

[0045] The terms “absence” or “part” used to refer to components in the present invention are not used for any limiting purpose and may be omitted.

[0046] Figures 5 and 6 are perspective views of a circuit breaker for wiring according to one embodiment of the present invention, viewed from different directions. Figure 7 is a perspective view showing the internal structure of a circuit breaker cut along the longitudinal direction. Figure 8 is a perspective view of Figure 6 with the power-side terminal cover removed.

[0047] A circuit breaker (100) according to one embodiment of the present invention comprises an outer case (200, 230) of the circuit breaker; and a terminal cover (260, 280) coupled to a terminal part (210, 220, 240, 250) of the outer case (200, 230), wherein the terminal cover (260, 280) is characterized in that an arc guide part is formed that is connected to an exhaust duct (218, 258) of the terminal part (210, 220, 240, 250) and guides arc gas generated when breaking.

[0048] The housing (200, 230) accommodates and supports the components of the circuit breaker. The housing (200, 230) is formed roughly in a box shape. The handle (141) of the switching mechanism (140) is exposed on the upper surface of the housing (200, 230). The handle (141) operates the switching mechanism (140) by the user's manual operating force.

[0049] The outer case (200, 230) is formed of an insulating material. The outer case (200, 230) may be composed of a case (200) positioned at the bottom and a cover (230) covering the upper portion of the case. Meanwhile, an upper cover (235) is provided at the central upper portion of the cover (230).

[0050] The front and rear surfaces of the housing (200, 230) are provided with housing terminal sections (210, 220, 240, 250) that can be connected to a power source or a load. The housing terminal sections (210, 220, 240, 250) are composed of a housing power side terminal section (220, 250) and a housing load side terminal section (210, 240). (Here, depending on the direction of current flow, the part that serves as the starting point is called the power side, and the part that serves as the destination is called the load side. These are general names that can be divided into one side and the other side. The same applies hereinafter.)

[0051] The outer case power side terminal section (220, 250) is composed of a case power side terminal section (220) and a cover power side terminal section (250).

[0052] The outer case load side terminal section (210, 240) is composed of a case load side terminal section (210) and a cover load side terminal section (240).

[0053] Assembly holes (242, 252) are formed in the cover power side terminal section (250) and the cover load side terminal section (240) so that a tool can be inserted to connect the terminals or the internal status can be visually checked. Assembly holes (242, 252) are provided for each phase.

[0054] Assembly grooves (244, 254) are formed in the cover power side terminal portion (250) and the cover load side terminal portion (240) respectively to connect auxiliary components such as terminal portion covers. The assembly grooves (244, 254) are provided at the end portion of the cover (230). The assembly grooves (244, 254) are provided between each phase. The assembly grooves (244, 254) are provided vertically at the ends of the cover power side terminal portion (250) and the cover load side terminal portion (240). The assembly grooves (244, 254) extend to the case terminal portions (220, 230).

[0055] A fastening hole (246, 256) is formed in the cover power side terminal section (250) and the cover load side terminal section (240) to fasten auxiliary components such as a terminal cover. The fastening hole (246, 256) is composed of a load side fastening hole (246) and a power side fastening hole (256).

[0056] Terminal holes (212, 222) are formed in the case power side terminal section (220) and the case load side terminal section (210), respectively. The terminal holes (212, 222) are composed of a load side terminal hole (212) and a power side terminal hole (222).

[0057] A terminal section (130, 135) is installed at the bottom of the terminal hole (212, 222). The terminal section (130, 135) is composed of a power-side terminal section (130) and a load-side terminal section (135). The terminal section (130, 135) and an external cable are connected through the terminal hole (212, 222).

[0058] An exhaust duct (218, 258) is formed in the outer case power side terminal section (220, 250) and the outer case load side terminal section (210, 240). At this time, a power side exhaust duct (258) may be provided in the cover power side terminal section (250) of the outer case power side terminal section (220, 250), and a load side exhaust duct (218) may be provided in the case load side terminal section (210) of the outer case load side terminal section (210, 240). This is a consideration for connecting with the exhaust structure of the base outer case (171).

[0059] Two exhaust ducts (218, 258) are provided for each phase. That is, they are respectively located on both sides of each phase of the outer case terminal section. The arc gas that comes out through the exhaust section (179) of the base case (171) is divided through the branch port (190) and discharged through the exhaust ducts (218, 258).

[0060] The outer terminal portions (210, 220, 240, 250) are provided with terminal portions (130, 135). The outer terminal portions (210, 220, 240, 250) are formed of an insulating material such as synthetic resin, and the terminal portions (130, 135) are formed of a conductive material (metallic material) so that a circuit is connected and current flows. The terminal portions (130, 135) are composed of a power-side terminal portion (130) and a load-side terminal portion (135).

[0061] Terminal sections (130, 135) are provided for each phase (or each pole). For example, in the case of a three-phase circuit breaker, three terminal sections may be provided on each of the power side and the load side.

[0062] Terminals (131, 136) are provided in the terminal section (130, 135). The power terminal section (130) is provided with a power terminal (131) connected to a power circuit, and the load terminal section (135) is provided with a load terminal (136) connected to a load circuit. Each terminal (131, 136) is connected to a fixed contactor (132, 133), respectively.

[0063] A branch port (190) is provided to connect the exhaust section (179) of the base assembly (170) and the exhaust duct (218, 258) of the case (200). The branch port (190) guides the arc gas generated in the arc extinguishing section (150) of the base assembly (170) to exit to the exhaust duct (218, 258). In addition, the branch port (190) serves to branch the arc gas so that it is divided into two exhaust ducts (218, 258) for each phase.

[0064] A trip unit (160) for detecting an abnormal current flowing in the circuit and tripping the switching mechanism is provided in a part of the outer case (200, 230). The trip unit (160) is usually provided on the load side.

[0065] The trip unit (160) of a circuit breaker for wiring has the main function of detecting fault current and short-circuit current and shutting off the switching mechanism (140) to protect the load and the line. The trip unit (160) is divided into a mechanical trip unit and an electronic trip unit depending on the method of detecting and tripping the current.

[0066] Mechanical trip mechanisms include thermal trip mechanisms, which operate by changes in current flowing through the conductor and deformation of the conductor due to its resistance, and magnetic trip mechanisms, which operate by changes in magnetic flux density. Thermal trip mechanisms typically utilize bimetals, while magnetic trip mechanisms typically utilize magnets and armatures.

[0067] An electronic trip unit operates a mechanism by using a sensor that detects the current flowing through the circuit. An electronic trip unit operates a mechanism from a control panel by measuring the current flowing through a conductor.

[0068] The embodiment of Fig. 7 is an example of a mechanical trip unit in which a thermal trip mechanism and a magnetic trip mechanism are combined.

[0069] The trip unit may include a heater (161) connected to a load-side terminal unit (135), a bimetal (162) coupled to the heater (161) to detect heat and bend according to the amount of heat, a magnet (163) and an armature (164) installed around the heater (161), a crossbar (165) installed so as to be rotatable by contact with the bimetal (162) or the armature (164), and a shooter (166) that is bound or released by rotation of the crossbar (165) to bind or release the nail (147) of the opening / closing mechanism unit (140).

[0070] Normally, when a small current delay is interrupted, the bimetal (162) is bent by the heat generated in the heater (161), causing the crossbar (165) to rotate and operate the switching mechanism (140), and when a large current instantaneous interruption is performed, the armature (164) is attracted by the magnetic force excited by the magnet (163), causing the crossbar (165) to rotate and operate the switching mechanism (140).

[0071] The user's operating power is transmitted to the opening / closing mechanism (140) through the handle (141). In order to transmit the power of the opening / closing mechanism (140) to each phase, a pair of rotary pins (145) are installed in the opening / closing mechanism (140). The rotary pins (145) are formed to have a length that crosses all phases and are installed in the shaft assembly (or actuator assembly) (120).

[0072] A base assembly (170) is provided. A contact portion and an arc extinguishing portion are installed in the base assembly (170). A base assembly (170) is provided for each phase.

[0073] A base assembly casing (abbreviated as base casing) (171) is provided. The base casing (171) can be formed by injection molding. The base casing (171) is formed in a roughly box shape. Contact parts (132, 133, 122, 123) and an arc extinguishing part (150) are installed in the base casing (171). An opening / closing mechanism part (140) is installed on the upper part of the base casing (171).

[0074] Contact points (fixed contact points and movable contact points) are provided. The contact points are the parts where the circuit is actually connected or disconnected.

[0075] Fixed contacts (132, 133) are fixedly installed inside the housing (200, 230). Specifically, fixed contacts (132, 133) and movable contacts (122, 123) are installed inside the base assembly (170) provided for each phase. Fixed contacts (132, 133) are connected to terminals (130, 135).

[0076] The fixed contacts (132, 133) are provided with fixed contacts (132a, 133a). The fixed contacts (132a, 133a) can be made of a material with excellent electrical conductivity and durability, such as a silver (Ag) alloy.

[0077] In the case of a double circuit breaker, fixed contacts (132, 133) are provided on the power side and the load side, respectively. That is, a power side fixed contact (132) and a load side fixed contact (133) are provided. At this time, the power side fixed contact (132) may be directly connected to the power side terminal (131) or may be formed integrally. The load side fixed contact (133) may be connected to the load side terminal (136) via a trip mechanism (particularly, a heater (161)).

[0078] An arc extinguishing unit (arc extinguishing device, arc chamber) (150) is provided near the contacts (fixed contacts and movable contacts) to extinguish the arc generated during the breaking. In the case of a double-contact type circuit breaker, the arc extinguishing units (150) are provided on the power supply side and the load side, respectively. The arc extinguishing unit (150) includes a pair of side plates (151, 152) and a plurality of grids (155) coupled to the side plates (151, 152) at predetermined intervals.

[0079] A shaft assembly (120) is provided. A rotary pin (145) is installed through the shaft assembly (120). The shaft assembly (120) receives the opening and closing power of the opening and closing mechanism (140) through the rotary pin (145) and rotates. As the shaft assembly (120) rotates, the movable contacts (122, 123) also rotate and come into contact with or are separated from the fixed contacts (132, 133).

[0080] The shaft assembly (120) is composed of a shaft body (121) and a movable contactor (122, 123).

[0081] The shaft body (121) is formed in a cylindrical or cylindrical shape. An axis (125) is formed protrudingly on both flat surfaces (disk surfaces) of the shaft body (121). A rotary pin (145) is inserted and installed through the shaft body (121) in a direction parallel to the axis (125).

[0082] The movable contacts (122, 123) are rotatably installed on the shaft body (121). The movable contacts (122, 123) rotate counterclockwise or clockwise together with the shaft body (121) or independently, and contact or separate from the fixed contacts (132, 133) to energize or cut off the line.

[0083] The movable contacts (122, 123) are composed of a power-side movable contact (122) that contacts or is separated from a power-side fixed contact (132) and a load-side movable contact (123) that contacts or is separated from a load-side fixed contact (133).

[0084] At both ends of the movable contacts (122, 123), movable contacts (122a, 123a) that can come into contact with the fixed contacts (132a, 133a) of the fixed contacts (132, 133) are respectively provided. The movable contacts (122a, 123a) can be made of a material with excellent electrical conductivity and durability, such as a silver (Ag) alloy.

[0085] A pressure spring (126) is provided inside the shaft body (121) to provide a pressure force to the movable contacts (122, 123). The pressure spring (126) is installed between the movable contacts (122, 123) and the shaft pin (127) provided inside the shaft body (121). When the movable contacts (122, 123) are in contact with the fixed contacts (122, 123), the pressure spring (126) prevents the movable contacts (122, 123) from being easily separated from the fixed contacts (122, 123).

[0086] The movable contacts (122, 123) rotate together with the shaft body (121) in normal low-current or high-current interruption situations, but in the case of current interruption, the movable contacts (122, 123) overcome the force of the pressure spring (126) due to the sudden electromagnetic repulsion and rotate independently. In this case, the movable contacts (122, 123) come into contact with another shaft pin (127) of the shaft body (121) and stop rotating.

[0087] An arc extinguishing unit (150) is provided to extinguish the arc generated during blocking. The arc extinguishing unit (150) is installed inside the base assembly (170). The arc extinguishing unit (150) is positioned adjacent to the contact points of the fixed contacts (132, 133) and the movable contacts (122, 123).

[0088] The arc extinguishing unit (150) includes side plates (151, 152) that face each other symmetrically to form a pair of side walls, and a grid (155) formed of a plurality of iron plates and inserted in parallel at a predetermined interval into the side plates (151, 152). A plurality of grids (155) may be provided and installed in multiple layers at a predetermined interval in the side plates (151, 152). Accordingly, a passage is provided between the grids (155) through which the arc can pass. The interval when the grids (155) are installed in layers may be appropriately set in consideration of the division and attraction of the arc.

[0089] The arc extinguishing section is surrounded by side plates (151, 152) and a grid (155) to form an internal space where the arc can be extinguished. The arc extinguishing section is also called an arc chamber.

[0090] When the circuit is in a normal state, the fixed contacts (132a, 133a) of the fixed contacts (132, 133) and the movable contacts (122a, 123a) of the movable contacts (122, 123) are connected and current flows. When a fault current occurs in the circuit, the movable contacts (122, 123) are rotated by the mechanism (107), so that the movable contacts (122a, 123a) are separated from the fixed contacts (132a, 133a), and the current is cut off. At this time, an arc occurs between the movable contacts (122a, 123a) and the fixed contacts (132a, 133a). This arc is divided into short arcs as it passes between the grids (155), and the arc voltage increases. In addition, the arc voltage is further increased by the arc extinguishing gas such as SF6 present in the arc extinguishing part. Accordingly, the arc is extinguished as the emission of free electrons is suppressed. Thereafter, the arc gas is discharged to the outside through the exhaust section (179) of the base case (171) and the exhaust duct (218, 258) of the case (200).

[0091] An exhaust port (179) is formed at both ends of the base case (171). The exhaust port (179) is formed as a pipe or hole that is connected to the outside of a part of the base case (171). In particular, the exhaust port (179) arranged on the load side is connected from the arc extinguishing part (150) through the branch port (190) to the exhaust duct (218, 258) of the case (200). The exhaust port (179) is formed to a predetermined length.

[0092] A terminal mounter (180) is provided in the terminal section (130, 135) to install a power side terminal (131) or a load side terminal (136).

[0093] The terminal mounter (180) is fitted into the exhaust duct (218). For this purpose, insertion grooves (181) are formed on both sides of the terminal mounter (180). It is preferable that the insertion grooves (181) be formed in a shape corresponding to the outer shape of the terminal exhaust duct (218). Usually, since the cross-section of the terminal exhaust duct (218) is formed in a rectangular shape, it is preferable that the insertion grooves (181) be formed in a square groove shape.

[0094] Let us examine the base assembly (170) in detail. The base assembly (170) is composed of a base case (171), contact parts (120, 132, 132) built into the base case (171), and an arc extinguishing part (150). Here, the contact parts (120, 132, 132) and the arc extinguishing part (150) are as described above.

[0095] An operating hole (172) is formed in the base case (171) to enable the rotation pin (145) to operate on the side. A portion of the shaft assembly (120) is exposed through the operating hole (172).

[0096] An exhaust section (179) is formed in the base case (171) to discharge the arc generated during blocking. The exhaust sections (179) are formed on both sides of the base case (171), that is, on the power supply side and the load side. Here, the exhaust section (179) on the power supply side may be provided at the upper part of the base case (171), and the exhaust section (179) on the load side may be provided at the lower part of the base case (171).

[0097] On one side of the base case (171), a power-side fixed contact (132) connected to the power-side terminal (131) is exposed, and on the other side, a load-side fixed contact (133) connected to the load-side terminal (136) is exposed. Here, as described above, the power-side terminal (131) and the power-side fixed contact (132) can be formed integrally. Meanwhile, the power-side fixed contact (132) can be arranged at the lower side of the base case (171), and the load-side fixed contact (133) can be arranged at the upper side of the base case (171).

[0098] Terminal covers (260, 280) are illustrated in Figures 9 to 14. Figures 9 and 10 are perspective and side views of a wiring circuit breaker, with the terminal cover cut off. Figures 11 and 12 are perspective and front views of a load-side terminal cover, and Figures 13 and 14 are perspective and front views of a power-side terminal cover of a wiring circuit breaker.

[0099] A terminal cover (260, 280) is provided. The terminal cover (260, 280) is provided to protect the terminals (210, 220, 240, 250) and external connection terminals, etc., and to improve insulation performance. The terminal cover (260, 280) is composed of a power-side terminal cover (280) and a load-side terminal cover (260). The power-side terminal cover (280) is coupled to the outer case power-side terminal (220, 250), and the load-side terminal cover (260) is coupled to the outer case load-side terminal (210, 240).

[0100] The load-side terminal cover (260) has a height and width corresponding to the load-side terminal portions (210, 240). The load-side terminal cover (260) has an upper surface portion (261) and a side portion (262).

[0101] The upper surface (261) of the load-side terminal cover (260) is placed on and connected to the load-side terminal portion (210, 240) of the outer case (200, 230). The upper surface (261) of the load-side terminal cover (260) is placed on and overlapped to the load-side terminal portion (210, 240) of the outer case (200, 230), so that the bonding force is excellent.

[0102] A cover fastening hole (265) that communicates with the fastening hole (246) of the cover load-side terminal portion (240) is formed on the upper surface (261) of the load-side terminal portion cover (260). A fastening member is coupled through the fastening hole (246) of the cover load-side terminal portion (240) and the cover fastening hole (265).

[0103] A cover assembly hole (268) that is connected to the assembly hole (242) of the cover load side terminal part (240) is formed on the upper surface (261) of the load side terminal part cover (260).

[0104] A top surface step portion (264) is provided on the upper surface (261) of the load side terminal cover (260) at the end portion, in which a step is formed.

[0105] The side portions (262) of the load-side terminal cover (260) are formed on each side, and a phase wall portion (263) is provided between the two side portions (262). In the case of a three-phase wiring circuit breaker, two phase wall portions (263) are provided.

[0106] An assembly projection (266) that fits into the assembly groove (244) of the load-side terminal portion (210, 240) is formed vertically on the inner end of the upper wall portion (263). When the assembly projection (266) is fitted into the assembly groove (244), the bonding force between the load-side terminal portion cover (260) and the outer case load-side terminal portion (210, 240) is further enhanced.

[0107] The outer wall of the upper wall portion (263) may be formed as a double wall. That is, a joining groove (269) may be formed vertically long on the outer wall portion of the upper wall portion (263).

[0108] A load-side arc guide part (270) is provided at the bottom of the load-side terminal cover (260). The load-side arc guide part (270) is connected to the load-side exhaust duct (218).

[0109] The load-side arc guide part (270) may be composed of a load-side guide plate (271) extending in the horizontal direction and a load-side guide grating (272, 273) extending in the vertical direction.

[0110] The load-side guide plate (271) is formed horizontally across the side portion (262) of the load-side terminal cover (260) and the lower portion of the upper wall portion (263).

[0111] The load-side guide plate (271) is formed to be inclined downward when viewed from the side (see Fig. 10). Accordingly, the arc gas is prevented from moving upward.

[0112] The load side guide plate (272, 273) is formed to extend to the lower part of the load side guide plate (271).

[0113] The load-side guide plate (272, 273) can be provided in the middle of each phase.

[0114] The load-side guide plates (272, 273) are formed in a 'V' shape. Accordingly, the arc coming from the exhaust duct (218) is not concentrated in the middle, but is dispersed to the side of each phase.

[0115] Arc gas coming from the load-side exhaust duct (218) flows downward by the load-side guide plate (271) and is dispersed to both side surfaces of each phase by the load-side guide plates (272, 273), thereby preventing movement to the load-side terminal portion (135), thereby improving insulation performance.

[0116] The power side terminal cover (280) has a height and width corresponding to the power side terminals (210, 240). The power side terminal cover (280) has an upper surface (281) and a side surface (282).

[0117] The upper surface (281) of the power side terminal cover (280) is placed on and connected to the power side terminal (220, 250) of the outer case (200, 230). The upper surface (281) of the power side terminal cover (280) is placed on and overlapped to the power side terminal (220, 250) of the outer case (200, 230), so that the bonding strength is excellent.

[0118] A cover fastening hole (285) that is connected to the fastening hole (256) of the cover power side terminal part (250) is formed on the upper surface (281) of the power side terminal part cover (280). A fastening member is connected through the fastening hole (256) of the cover power side terminal part (250) and the cover fastening hole (285).

[0119] A cover assembly hole (288) that is connected to the assembly hole (252) of the cover power side terminal part (250) is formed on the upper surface (281) of the power side terminal part cover (280).

[0120] The upper surface (281) of the power side terminal cover (280) is provided with a stepped upper surface (284) formed in a step manner.

[0121] The side portions (282) of the power side terminal cover (280) are formed on each side, and a phase wall portion (283) is provided between the two side portions (282). In the case of a three-phase wiring circuit breaker, two phase wall portions (283) are provided.

[0122] An assembly protrusion (286) that fits into the assembly groove (254) of the power terminal portion (220, 250) is formed vertically on the inner end of the upper wall portion (283). When the assembly protrusion (286) is fitted into the assembly groove (254), the bonding force between the power terminal portion cover (280) and the power terminal portion (220, 250) of the outer case is further enhanced.

[0123] The outer wall of the upper wall portion (283) can be formed as a double wall. That is, a joining groove (289) can be formed vertically long on the outer wall portion of the upper wall portion (283).

[0124] A power-side arc guide part (290) is provided on the upper part of the power-side terminal cover (280). The power-side arc guide part (290) is connected to the power-side exhaust duct (258).

[0125] The power-side arc guide part (290) may be composed of a power-side guide plate (291) extending in the horizontal direction and a power-side guide grid plate (292, 293) extending in the vertical direction.

[0126] The power side guide plate (291) is formed horizontally across the side portion (282) of the power side terminal cover (280) and the upper portion of the upper wall portion (283).

[0127] The power-side guide plate (291) is formed to be inclined upward when viewed from the side (see Fig. 10). Accordingly, the arc gas is prevented from moving downward.

[0128] The power side guide plate (292, 293) is formed as an extension on the upper part of the power side guide plate (291).

[0129] The power side guide plate (292, 293) can be provided in the middle of each phase.

[0130] The power-side guide plate (292, 293) is formed in a 'V' shape. Accordingly, the arc coming from the power-side exhaust duct (258) is not concentrated in the middle, but is dispersed to the side of each phase.

[0131] The arc gas coming from the power side exhaust duct (258) flows downward by the power side guide plate (291) and is dispersed to both side surfaces of each phase by the power side guide plates (292, 293), thereby preventing movement to the power side terminal portion (130), thereby improving the insulation performance.

[0132] According to the circuit breaker for wiring according to each embodiment of the present invention, an arc guide part is provided on the terminal part cover coupled to the terminal part so that the arc does not enter the terminal part but is discharged to the outside.

[0133] Specifically, the arc gas coming out of the exhaust duct of the terminal part flows downward by the guide plate of the terminal part cover and is dispersed to both side surfaces of each phase by the guide plate of the terminal part cover, thereby preventing movement to the terminal part and improving the insulation performance.

[0134] Therefore, insulation breakdown at the terminal is prevented.

[0135] In the above-described embodiment, the load-side arc guide part (270) is provided at the lower part of the load-side terminal part cover (260), and the power-side arc guide part (290) is provided at the upper part of the power-side terminal part cover (280). However, in another embodiment, the load-side arc guide part (270) may be provided at the upper part of the load-side terminal part cover (260), and the power-side arc guide part (290) may be provided at the lower part of the power-side terminal part cover (280).

[0136] The embodiments described above are embodiments that implement the present invention, and those skilled in the art will appreciate that various modifications and variations can be made without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments. In other words, the protection scope of the present invention should be interpreted by the following claims, and all technical ideas within a scope equivalent thereto should be interpreted as being included within the scope of the rights of the present invention.

[0137] [Explanation of symbols]

[0138] 120 shaft assembly

[0139] 130 Power side terminal

[0140] 131 Power side terminal

[0141] 132 Power side fixed contactor

[0142] 133 Load side fixed contactor

[0143] 135 Load side terminal

[0144] 136 Load side terminal

[0145] 150 Arc Sohobu

[0146] 170 base assembly

[0147] 171 base enclosure

[0148] 179 Exhaust

[0149] 180 terminal mounter

[0150] 190th Quarter

[0151] 200 cases

[0152] 210 Case load side terminal

[0153] 212 Load side terminal hole

[0154] 218 Load side exhaust duct

[0155] 220 case power side terminal

[0156] 222 Power side terminal hole

[0157] 230 covers

[0158] 240 Cover load side terminal

[0159] 244,254 assembly homes

[0160] 246 Load side fastening hole

[0161] 250 cover power side terminal

[0162] 256 Power side fastening hole

[0163] 258 Power side exhaust duct

[0164] 260,280 terminal cover

[0165] 261,281 upper surface

[0166] 262 Side

[0167] 263 Upper and lower wall

[0168] 265 cover fastening hole

[0169] 266 Assembly protrusion

[0170] 268 cover assembly holes

[0171] 269 ​​Combined Home

[0172] 270,290 Arc guide section

[0173] 271,291 guide plates

[0174] 272, 273, 292, 293 guide plates

Claims

1. Enclosure of circuit breaker for wiring; and Including a terminal cover coupled to the terminal of the above outer case, The above terminal cover, A wiring circuit breaker having an arc guide section that is connected to the exhaust duct of the terminal section and guides arc gas generated when breaking.

2. A wiring circuit breaker according to claim 1, characterized in that the exhaust ducts are provided on each side of each phase.

3. In the first paragraph, the arc guide part, A guide plate extending horizontally to the terminal cover, A wiring circuit breaker characterized by comprising a guide plate extending vertically from the above guide plate.

4. In the third paragraph, the arc guide part, One terminal part of the above outer case is provided at either the upper or lower end, A wiring circuit breaker characterized in that the other terminal part of the outer case is provided on either the upper or lower side.

5. In paragraph 4, the guide plate, The above one-side terminal portion is formed with an incline either upward or downward toward the outside, A wiring circuit breaker characterized in that the terminal portion on the other side is formed with an incline toward the outside, either upward or downward.

6. A wiring circuit breaker according to paragraph 5, characterized in that the guide grid is provided in the middle part of each phase.

7. A wiring circuit breaker according to claim 6, characterized in that the guide plate is formed in a ‘V’ shape so as to spread outward.

8. A wiring circuit breaker according to claim 1, characterized in that the upper surface of the terminal cover is placed on the terminal and overlapped and connected.

9. A wiring circuit breaker according to claim 1, characterized in that a fastening member is coupled through a fastening hole of the terminal portion and a cover fastening hole of the terminal portion cover.

10. A wiring circuit breaker according to claim 1, characterized in that an assembly projection is formed vertically on the inner end of the upper wall formed on the terminal cover to be fitted into the assembly groove of the terminal.

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