Molded case circuit breaker with double bulkhead for phase-to-phase insulation

Abstract

Technology is disclosed regarding a circuit breaker for wiring that includes a double partition for inter-phase insulation. The circuit breaker for wiring includes a single-pole blocking unit capable of interrupting the current state between the terminals of a power source and a load, a tripping device that causes the single-pole blocking unit to operate to interrupt the current state when an overcurrent flows, and a circuit breaker base and a circuit breaker cover that internally mount the single-pole blocking unit and the tripping device. The circuit breaker base includes a first insulating partition disposed between the power-side fixed contact portions of each phase of the single-pole blocking unit. The first insulating partition is a double partition composed of a plurality of plate-shaped members of the same shape arranged side by side. The circuit breaker base may further include a second insulating partition disposed between the load-side fixed contact portions of each phase of the single-pole blocking unit. According to the present invention, even when a high voltage is applied to the circuit breaker for wiring, inter-phase insulation breakdown does not occur, resulting in excellent insulation performance.

Description

Technology Field

[0001] The present invention relates to a circuit breaker for wiring, and in particular discloses a circuit breaker for wiring that includes a double partition for inter-phase insulation and can operate stably even at high voltage. Background Technology

[0002] A Molded Case Circuit Breaker (MCCB) is a device that detects overcurrents and short circuits to interrupt a circuit. It can interrupt the circuit even under large fault currents and includes an arc extinguishing mechanism to eliminate the arc generated during circuit interruption. When an overcurrent exceeding the rated current flows, heat is generated, and when a short circuit occurs in a wire, a sudden current flows, causing sparks and heat. Overcurrents and short circuits can cause damage to electrical equipment or lead to fires. Therefore, MCCBs are used to protect circuits and electrical equipment and prevent fires.

[0003] A molded case circuit breaker (MCCB) includes a mechanism that interrupts the actual circuit and a tripping device that detects an overcurrent and operates the mechanism. In the event that a large current flows rapidly for a short period of time, such as in a short circuit, an armature utilizing electromagnetic force is used to perform an instantaneous tripping operation. In the event that a continuous overcurrent flows, a bimetal utilizing heat generated by the overcurrent is used to perform an inverse tripping operation.

[0004] FIG. 1 is a cross-sectional view showing the main configuration of a circuit breaker for wiring according to the prior art.

[0005] A circuit breaker according to the prior art is a device that detects an overcurrent flowing on the load side using a trip device (190) and, when an overcurrent flows, disconnects the load side terminal (170) connected to the load side wire (192) from the power side terminal (130) to cut off power. The trip device (190) detects the overcurrent using a heater (191) connected to the load side wire (192), a fixed core (193) that generates magnetism when a fault current occurs, a bimetal (194), etc., and rotates the trip shaft (195) to operate the switching mechanism (110). The switching mechanism (110) may also be operated from the outside using a lever (115).

[0006] The power side terminal (130) is connected to the power side fixed contact part (135), and the load side terminal (170) is connected to the load side fixed contact part (175). When power is supplied normally, the power side fixed contact part (135) is in contact with the power side movable contact part (153), and the load side fixed contact part (175) is in contact with the load side movable contact part (157), so that power is transferred from the power source to the load.

[0007] When an overcurrent flows, the trip device (190) operates, and the shaft assembly (160) rotates around the rotation axis (155) by means of the opening / closing mechanism (110). When the shaft assembly (160) rotates, the rotating bar (156) also rotates together, and the power-side movable contact (153) and the load-side movable contact (157) located at both ends of the rotating bar (156) rotate, so that they are opened from the power-side fixed contact (135) and the load-side fixed contact (175), respectively, thereby cutting off the power.

[0008] When the contact to which high voltage is applied is opened during overcurrent interruption, an arc is generated at the power side contact between the power side fixed contact part (135) and the power side movable contact part (153), and at the load side contact between the load side fixed contact part (175) and the load side movable contact part (157). The arc generated at the power side contact is discharged through the power side exhaust port (120) via the power side arc extinguishing part (125), and the arc generated at the load side contact is discharged through the load side exhaust port (180) via the load side arc extinguishing part (185).

[0009] The instantaneous flow of high-temperature and high-pressure gas generated inside the circuit breaker by the arc causes deformation of the parts and separation of the fastening parts. High-temperature gas and thermal molten material flow into the circuit breaker through the separated gaps and assembly gaps between parts, and foreign substances such as soot from carbonization are applied to the lower surface (140) of the circuit breaker. Due to these foreign substances, the insulation performance of the circuit breaker is reduced, and a current path is formed inside, which may cause tracking.

[0010] Meanwhile, the carbonized coating by the arc can also be applied to the load-side wire (192) of the trip device (190) located near the load-side arc extinguishing part (185).

[0011] FIG. 2 is a perspective view showing a circuit breaker base located at the bottom of a circuit breaker according to the prior art.

[0012] A protrusion (240) is formed on the circuit breaker base to accommodate a single-pole circuit breaker for each phase. When soot or the like is applied to the surface of the circuit breaker base, including the protrusion (240), due to an arc generated near the power-side fixed contact (135), a current path indicated by a dotted line is created by the carbonized material. Due to this current path, the insulation performance between each phase or pole is reduced, and if it worsens, insulation breakdown of the circuit breaker may occur. Various methods are being studied to solve these problems.

[0013] Meanwhile, Public Patent No. 10-2019-0094019, disclosed on August 12, 2019, relates to a "small circuit breaker" and discloses a small circuit breaker equipped with an inter-phase insulation barrier. The disclosed small circuit breaker includes an enclosure having a mounting portion formed on its side, and an insulation barrier formed in a plate shape and inserted and coupled to the mounting portion to prevent inter-phase insulation breakdown. In a distribution board where a plurality of circuit breakers are installed side by side, the inter-phase insulation barrier can be used without separating or dismantling the circuit breakers, thereby preventing inter-phase insulation breakdown.

[0014] Utility Model Registration No. 20-0487464, announced on September 20, 2018, relates to a "circuit breaker for wiring" and discloses a circuit breaker for wiring having an insulating barrier in the tripping portion. The disclosed circuit breaker for wiring includes an insulating barrier that is coupled to the front of the tripping portion case and insulates the tripping portion from the arc extinguishing portion. The insulation performance of the disclosed circuit breaker for wiring is improved by the tripping portion insulating barrier. Prior art literature

[0015] (Patent Document 0001) KR 10-2019-0094019 A (2019.08.12.)(Patent Document 0002) KR 20-0487464 Y1 (2018.09.20.) The problem to be solved

[0016] One objective of the present invention is to provide a circuit breaker comprising a double partition for inter-phase insulation that can prevent the insulation performance from being degraded by the molten material generated during arc extinguishing being applied to the bottom surface of the circuit breaker.

[0017] Another objective of the present invention is to provide a circuit breaker comprising a double partition for inter-phase insulation that can prevent the insulation performance from being degraded by the molten material generated during arc extinguishing being applied to the tripping device of the circuit breaker.

[0018] The problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description below. means of solving the problem

[0019] According to one aspect of the proposed invention, a circuit breaker for wiring comprising a double partition for inter-phase insulation comprises a plurality of single-pole breaking units, a plurality of tripping devices, a circuit breaker base, and a circuit breaker cover.

[0020] A single-pole blocking unit includes a first terminal, a second terminal, and a shaft assembly. The first terminal and the second terminal are connected to the power supply and load of each phase, respectively. The shaft assembly can rotate around a rotation axis to block the current flow between the first terminal and the second terminal. The single-pole blocking unit further includes a first fixed contact and a second fixed contact. The first fixed contact is connected to the first terminal. The second fixed contact is connected to the second terminal. The shaft assembly includes a rotating bar and a rotating pin. The rotating bar has a first movable contact at one end that contacts the first fixed contact and a second movable contact at the other end that contacts the second fixed contact. The rotating pin rotates a plurality of first movable contacts and a plurality of second movable contacts simultaneously.

[0021] The trip device is provided with a conductor connected to each second terminal of the single-pole blocking unit, and operates the single-pole blocking unit to cut off the current state when an overcurrent flows through the conductor.

[0022] The plurality of single-pole blocking units and the plurality of tripping devices are mounted inside the circuit breaker base. The circuit breaker base includes a first insulating partition. The first insulating partition is composed of a plurality of plate-shaped members of the same shape arranged side by side and is positioned between the first fixed contact portions of each phase of the plurality of single-pole blocking units.

[0023] The circuit breaker cover is attached to the upper part of the circuit breaker base. The circuit breaker cover covers the upper outer surface of the plurality of single-pole circuit breakers and the plurality of tripping devices.

[0024] According to an additional aspect, the first insulating bulkhead comprises a rectangular bulkhead portion and an arc-shaped bulkhead portion. The rectangular bulkhead portion is positioned next to the first fixed contact portion. The arc-shaped bulkhead portion is configured in a downwardly concave arc shape so as not to hinder the rotation of the shaft assembly.

[0025] According to an additional aspect, the rectangular partition is formed higher than the height of the first fixed contact portion.

[0026] According to an additional aspect, the arc-shaped bulkhead is formed such that the height of the lowest point of the arc is lower than the height of the lowest point of the rotating pin.

[0027] According to an additional aspect, the circuit breaker base further comprises a second insulating partition. The second insulating partition is composed of a plate-shaped member connected to the first insulating partition and is disposed between the second fixed contact portions of each phase of the plurality of single-pole blocking units.

[0028] According to an additional aspect, the second insulating partition is formed higher than the height of the second fixed contact portion.

[0029] According to an additional aspect, the circuit breaker base further includes a third insulating partition. The third insulating partition is formed below the second insulating partition and is disposed in the space between the trip bases of the trip device.

[0030] According to an additional aspect, the trip device includes a trip base. The trip base blocks the surface in contact with the unipolar blocking unit so that the conductors inside are not exposed toward the unipolar blocking unit.

[0031] According to an additional aspect, the single-pole blocking unit includes a catch, and the trip device includes a coupling groove. The catch is formed in a second exhaust port through which arc vapor generated at the second fixed contact portion is discharged. The coupling groove is formed to engage with the catch at a position that engages with the second exhaust port of the single-pole blocking unit. Effects of the invention

[0032] A circuit breaker for wiring including a double partition for inter-phase insulation according to the present invention can improve inter-phase insulation performance by increasing the insulation distance through the application of a double partition to the single-pole breaking unit assembly of the circuit breaker base.

[0033] A circuit breaker for wiring including a double partition for inter-phase insulation according to the present invention can improve the inter-phase insulation performance of the circuit breaker by providing a trip base that prevents the inflow of gas and molten material into the conductor part of the trip device.

[0034] Furthermore, according to the present invention, a circuit breaker for wiring that can operate stably even at high voltage can be provided because it has excellent insulation performance. Brief explanation of the drawing

[0035] FIG. 1 is a cross-sectional view showing the main configuration of a circuit breaker for wiring according to the prior art. FIG. 2 is a perspective view showing a circuit breaker base located at the bottom of a circuit breaker according to the prior art. FIG. 3 is an exploded perspective view showing the main configuration of a circuit breaker for wiring including a double partition for inter-phase insulation according to one embodiment. FIG. 4 is a perspective view showing the configuration of an insulating partition formed on a circuit breaker base located at the bottom of a circuit breaker including a double partition for inter-phase insulation according to one embodiment. FIG. 5 is a cross-sectional view showing the main configuration of a circuit breaker for wiring including a double partition for inter-phase insulation according to one embodiment and the shape of the insulation partition. FIG. 6 is a cross-sectional view of a circuit breaker for wiring including a double partition for inter-phase insulation according to one embodiment, with the insulating partition superimposed. FIG. 7 is a cross-sectional view taken by cutting the portion coupled to the tripping device in a circuit breaker including a double partition for inter-phase insulation according to one embodiment, looking from the tripping device side toward the single-pole blocking unit side. FIG. 8 is a side view of a single-pole breaking unit and a trip device mounted on a wiring circuit breaker including a double partition for inter-phase insulation according to one embodiment. FIG. 9 is a perspective view of a trip device mounted on a circuit breaker including a double partition for inter-phase insulation according to one embodiment, viewed from the direction of a single-pole blocking unit. FIG. 10 is a photograph showing the state of the circuit breaker base after a withstand voltage test of a circuit breaker including a double partition for inter-phase insulation according to one embodiment. Specific details for implementing the invention

[0036] The foregoing and additional aspects are embodied through embodiments described with reference to the attached drawings. It is understood that the components of each embodiment may be combined in various ways within the embodiment or with components of other embodiments, unless otherwise stated or contradictory. Based on the principle that the inventor may appropriately define the concepts of terms to best describe his invention, the terms used in this specification and claims shall be interpreted in a meaning and concept consistent with the description or proposed technical idea. Components indicated by identical or similar reference numerals perform identical or similar functions, and thus their description may be omitted. For components with reference numerals for which description is omitted, reference may be made to the descriptions previously provided for components with identical or similar reference numerals.

[0037] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0038] FIG. 3 is an exploded perspective view showing the main configuration of a circuit breaker for wiring including a double partition for inter-phase insulation according to one embodiment.

[0039] According to one aspect of the proposed invention, a wiring circuit breaker including a double partition for inter-phase insulation comprises a circuit breaker cover (305), a plurality of tripping devices (390), a plurality of single-pole blocking units (320), and a circuit breaker base (340). The wiring circuit breaker may further include a switching mechanism (310).

[0040] The circuit breaker illustrated in FIG. 3 is a circuit breaker used for supplying three-phase power, and is illustrated with three single-pole breaking units and three tripping devices. A plurality of single-pole breaking units (320) and a plurality of tripping devices (390) are mounted inside the circuit breaker base (340). The plurality of single-pole breaking units (320) and the plurality of tripping devices (390) are each assembled as separate modules, and then the plurality of tripping devices (390) are attached to the front of the plurality of single-pole breaking units (320) and mounted on the circuit breaker base (340).

[0041] The circuit breaker base (340) includes a plurality of insulating partitions formed to protrude upward from the bottom for insulating each phase of a plurality of single-pole blocking units (320) and a plurality of tripping devices (390). The circuit breaker base (340) includes an insulating partition for a single-pole blocking unit for insulating each phase of a plurality of single-pole blocking units (320), and an insulating partition for a tripping device for insulating each phase of a plurality of tripping devices (390). The insulating partition for the single-pole blocking unit and the insulating partition for the tripping device may be composed of a plurality of interconnected partitions. For example, a first insulating partition and a second insulating partition may be used as the insulating partition for the single-pole blocking unit, and a second insulating partition and a third insulating partition may be used as the insulating partition for the tripping device.

[0042] The single-pole blocking unit (320) is provided with an exhaust port (380) protruding forward from the front lower portion. The thickness of the end portion of the exhaust port (380) is increased to form a catch at the end portion of the exhaust port. A trip device (390) is coupled to the front of the single-pole blocking unit (320). The exhaust port coupling groove formed on the rear lower portion of the trip device (390) is coupled to the exhaust port catch formed on the front lower portion of the single-pole blocking unit (320), thereby allowing the trip device (390) to be coupled to the single-pole blocking unit (320).

[0043] The circuit breaker cover (305) is attached to the upper part of the circuit breaker base (340). The circuit breaker cover (305) covers the upper outer surface of a plurality of single-pole circuit breaker units (320) and a plurality of trip devices (390). The circuit breaker cover (305) and the circuit breaker base (340) serve as the enclosure for the plurality of single-pole circuit breaker units (320) and the plurality of trip devices (390). The circuit breaker cover (305) and the circuit breaker base (340) are formed using an insulating material.

[0044] FIG. 4 is a perspective view showing the configuration of an insulating partition formed on a circuit breaker base located at the bottom of a circuit breaker including a double partition for inter-phase insulation according to one embodiment.

[0045] The circuit breaker base (340) includes a first insulating partition (441) for insulating each phase of a plurality of single-pole blocking units (320). The first insulating partition (441) is a double partition, that is, composed of a plurality of plate-shaped members of the same shape arranged side by side. By configuring the first insulating partition (441) as a double partition, the current path between each phase is increased, thereby improving the insulation performance between phases.

[0046] The first insulating partition (441) includes a side partition section (442), a rectangular partition section (443), and an arc-shaped partition section (445). The side partition section (442) is a double partition area extending from the first terminal section of the single-pole blocking unit (320). The rectangular partition section (443) is located between the side partition section and the arc-shaped partition section to improve the insulation of each phase of the single-pole blocking unit (320). The arc-shaped partition section (445) is configured in a downwardly concave arc shape so as not to interfere with the blocking operation of the single-pole blocking unit (320).

[0047] According to an additional aspect, the circuit breaker base (340) further includes a second insulating partition (447). The second insulating partition (447) may be composed of a single plate-shaped member connected to the first insulating partition (441). The second insulating partition (447) is intended to improve the insulation performance of the contact located at the top, and since the distance to the bottom surface is sufficiently long, it is preferable to form it as a single partition. Vertical ribs may be formed on the left and right sides to increase strength.

[0048] According to an additional aspect, the circuit breaker base (340) further includes a third insulating partition (449). The third insulating partition (449) is formed below the second insulating partition (447) and is positioned in the space between the trip bases of the trip device (390). The third insulating partition (449) may extend into the lower space of the single-pole blocking unit (320).

[0049] FIG. 5 is a cross-sectional view showing the main configuration of a circuit breaker for wiring including a double partition for inter-phase insulation according to one embodiment and the shape of the insulation partition.

[0050] FIG. 5(a) is a cross-sectional view taken from the side with the middle section cut off while the single-pole blocking unit (320) and the trip device (390) are installed.

[0051] A circuit breaker for wiring according to one embodiment is a device that detects an overcurrent flowing on the load side using a trip device (390), and when an overcurrent flows, operates a single-pole blocking unit (320) to disconnect the load side terminal (570) connected to the load side conductor (592) from the power side terminal (530) to cut off power. The trip device (390) detects the overcurrent using a heater (591) connected to the load side conductor (592), a fixed core (593) that generates magnetism when a fault current occurs, a bimetal (594), etc., and rotates a trip shaft (595) to operate the switching mechanism (510). The switching mechanism (510) may also be operated from the outside using a lever (515).

[0052] The single-pole blocking unit (320) includes a first terminal (530), a second terminal (570), and a shaft assembly (560). The first terminal (530) and the second terminal (570) are connected to the power supply and the load of each phase, respectively. For example, the first terminal (530) is a power-side terminal connected to the power supply, and the second terminal (570) is a load-side terminal connected to the load.

[0053] The single-pole blocking unit (320) further includes a first fixed contact (535) and a second fixed contact (575). The first fixed contact (535) is connected to the first terminal (530). The second fixed contact (575) is connected to the second terminal (570). When power is supplied normally, the first fixed contact (535) is in contact with the first movable contact (553), and the second fixed contact (575) is in contact with the second movable contact (557), so that power is transferred from the power source to the load.

[0054] The shaft assembly (560) can rotate around a rotation axis to cut off the electrical connection between the first terminal (530) and the second terminal (570). The shaft assembly (560) includes a rotating bar (556) and a rotating pin (565).

[0055] The rotating bar (556) is provided with a first movable contact part (553) that contacts a first fixed contact part (535) at one end, and a second movable contact part (557) that contacts a second fixed contact part (575) at the other end. Since the first movable contact part (553) and the second movable contact part (557) are formed at both ends of the same rotating bar (556), they move as a single unit.

[0056] The rotating pin (565) connects the shaft assembly to a plurality of phases to simultaneously rotate a plurality of first movable contact parts (553) and a plurality of second movable contact parts (557).

[0057] When an overcurrent flows, the trip device (390) operates and the shaft assembly (560) rotates around the rotation axis (555) by means of the opening / closing mechanism (510). When the shaft assembly (560) rotates, the rotating bar (556) also rotates together, and the first movable contact part (553) and the second movable contact part (557) located at both ends of the rotating bar (556) rotate, so that they are opened from the first fixed contact part (535) and the second fixed contact part (575), respectively, thereby cutting off the power.

[0058] The trip device (390) is provided with a conductor (592) connected to each second terminal (570) of the single-pole blocking unit (320), and when an overcurrent flows through the conductor (592), the single-pole blocking unit (320) is operated to cut off the current state between the first terminal (530) and the second terminal (570).

[0059] When a high voltage is applied to a contact when an overcurrent is interrupted, an arc is generated at the contact between the first fixed contact part (535) and the first movable contact part (553) of the single-pole interruption unit (320), and at the contact between the second fixed contact part (575) and the second movable contact part (557). The arc generated at the first fixed contact part (535) is discharged through the first exhaust port (520) via the first arc extinguishing part (525), and the arc generated at the second fixed contact part (575) is discharged through the second exhaust port (580) via the second arc extinguishing part (585). The arc gas discharged through the second arc extinguishing part (585) of the single-pole interruption unit (320) is discharged to the outside through the exhaust groove formed in the lower part of the trip device (390) via the second exhaust port (580).

[0060] FIG. 5(b) is a cross-sectional view taken from the side by cutting the circuit breaker base (340) to an insulating partition position located between each phase of the single-pole blocking unit (320) and the trip device (390).

[0061] According to an additional aspect, the first insulating partition (441) includes a rectangular partition section (443) and an arc-shaped partition section (445).

[0062] A rectangular partition (443) is positioned next to the first fixed contact (535). To provide insulation between adjacent first fixed contacts (535), the height (H1) of the rectangular partition (443) is formed to be higher than the height of the first fixed contact (535).

[0063] The arc-shaped bulkhead (445) is configured in a downwardly concave arc shape so as not to hinder the rotation of the shaft assembly (560). In the illustrated example, the height of the arc-shaped bulkhead (445) is formed to be lower than the lowest point height (H4) of the shaft assembly (560). The arc-shaped bulkhead (445) can be formed so that the lowest point height (H4) of the arc is lower than the lowest point height of the rotation pin (565). For example, if the left rotation pin (565) moves to the lower center, forming it lower than the lowest point height (H3) of the rotation pin does not hinder the operation of the rotation pin (565). As another example, if the left rotation pin (565) rotates only upward, the maximum height of the arc-shaped bulkhead (445) can be formed lower than the height (H2) of the left rotation pin, that is, close to the height (H2) of the left rotation pin. Meanwhile, to increase the electrical conduction distance from the floor, it is preferable that the minimum height of the arc-shaped bulkhead (445) be greater than 1 / 4 of the height of the square bulkhead, and even more preferable that it be greater than 1 / 3.

[0064] According to an additional aspect, the height (H5) of the second insulating partition (447) is formed to be higher than the height of the second fixed contact portion (575). Since the second insulating partition (447) has a high height from the bottom of the circuit breaker base (340) and thus a long current-carrying distance, it is possible to form it as a single partition.

[0065] According to an additional aspect, the height (H6) of the third insulating partition (449) can be formed to be the same as the height (H1) of the rectangular partition portion (443) of the first insulating partition. The third insulating partition (449) is formed to be wider than the second insulating partition (447) formed above it.

[0066] FIG. 6 is a cross-sectional view of a circuit breaker for wiring including a double partition for inter-phase insulation according to one embodiment, with the insulating partition superimposed.

[0067] Referring to FIG. 6, the rectangular bulkhead portion (443) of the first insulating bulkhead is formed high enough to cover the first fixed contact portion (535). The arc-shaped bulkhead portion (445) of the first insulating bulkhead is located at a position lower than the rotation of the shaft assembly.

[0068] The second insulating partition (447) is formed adjacent to the arc-shaped partition section (445) of the first insulating partition and is formed high enough to cover the second fixed contact section (575). The second insulating partition (447) extends to the trip section. A third insulating partition (449) is located below the second insulating partition (447) of the trip section.

[0069] FIG. 7 is a cross-sectional view taken by cutting the portion coupled to the tripping device in a circuit breaker including a double partition for inter-phase insulation according to one embodiment, looking from the tripping device side toward the single-pole blocking unit side.

[0070] Referring to FIG. 7, a single-pole blocking unit (320) is mounted inside a circuit breaker base (340), and a circuit breaker cover (305) is attached to and coupled with the circuit breaker base (340) on the upper part of the single-pole blocking unit (320). A second insulating partition (447) and a third insulating partition (449) are located between each phase of the single-pole blocking unit (320). The third insulating partition (449) is formed from the bottom to the top of the circuit breaker base (340), and the second insulating partition (447) is formed on the upper part of the third insulating partition (449).

[0071] The second insulating partition (447) is formed higher than the height of the second terminal (570) which is located higher than the second fixed contact part (575).

[0072] A third insulating partition (449) is formed below the second insulating partition and is placed in the space between each phase of the single-pole blocking unit. The third insulating partition (449) is formed to be thicker than the second insulating partition. It is preferable that the width of the third insulating partition (449) be formed to be equal to the gap between the single-pole blocking units (320). A second exhaust port (580) is formed below the single-pole blocking unit (320) to discharge arc gas. If the width of the third insulating partition (449) is formed to be equal to the gap between the single-pole blocking units (320), it is possible to prevent the single-pole blocking units (320) from spreading apart due to high-pressure arc gas, particularly the gap near the second exhaust port (580).

[0073] The third insulating partition (449) may be extended and positioned into the space between the trip bases of the trip device. By making the spacing between each phase of the trip device (390) equal to the spacing between each phase of the unipolar blocking unit (320), the unipolar blocking unit (320) and the trip device (390) can be secured by the third insulating partition (449) of the same width.

[0074] FIG. 8 is a side view of a single-pole blocking unit and a tripping device mounted on a wiring circuit breaker including a double partition for inter-phase insulation according to one embodiment. FIG. 8 (a) is a side view of a single-pole blocking unit (320), and FIG. 8 (b) is a side view of a tripping device (390).

[0075] Referring to FIG. 8(a), the single-pole blocking unit (320) includes a stopper (883). The stopper (883) is formed outside the second exhaust port (580) of the single-pole blocking unit (320). The second exhaust port (580) is formed protruding toward the trip device (390) to discharge arc vapor generated at the second fixed contact part (575). The stopper (883) is formed on the outer edge of the exhaust duct (881) protruding toward the trip device. The stopper (883) may be formed at the end of the exhaust duct (881). The stopper (883) may be formed with a larger outer dimension by increasing the thickness in at least one direction, preferably three directions, among the upper, left, and right sides of the exhaust duct (881).

[0076] Referring to FIG. 8(b), the trip device (390) includes a coupling groove (893). The coupling groove (893) of the trip device (390) engages with the catch (883) of the single-pole blocking unit (320). To connect the trip device (390) to the single-pole blocking unit (320), the trip device (390) is provided with a duct groove (891) into which the exhaust duct (881) of the second exhaust port (580) of the single-pole blocking unit is fitted. Since the exhaust duct (881) of the single-pole blocking unit has a catch (883), the trip device (390) includes a coupling groove (893) that engages with the catch (883) at a position where it is connected to the second exhaust port (580) of the single-pole blocking unit.

[0077] The cross-sectional area of ​​the catch (883) of the single-pole blocking unit is larger than the cross-sectional area of ​​the exhaust duct (881). That is, the external size of the catch (883) is larger than the external size of the exhaust duct (881). For example, if the size of the catch (883) is large in all three directions—up, left, and right—the trip device (390) can be connected to the single-pole blocking unit (320) by moving from the top to the bottom. When the trip device (390) and the single-pole blocking unit (320) are connected, the catch (883) of the single-pole blocking unit is larger than the duct groove (891) of the trip device, so the connection between the trip device (390) and the single-pole blocking unit (320) can be maintained stably.

[0078] In addition, even when high-pressure arc gas is generated inside the single-pole blocking unit, if the stopper (883) and the coupling groove (893) are coupled, the second exhaust port (580) of the single-pole blocking unit can maintain a constant size by the trip device (390). As a result, the gap in the single-pole blocking unit (320) can be widened, preventing arc gas from leaking toward the trip device (390).

[0079] FIG. 9 is a perspective view of a trip device mounted on a circuit breaker including a double partition for inter-phase insulation according to one embodiment, viewed from the direction of a single-pole blocking unit.

[0080] According to an additional aspect, the trip device (390) includes a trip base (910). The trip base (910) blocks the surface in contact with the unipolar blocking unit so that the conductors inside the trip device (390) are not exposed toward the unipolar blocking unit (320).

[0081] The trip base (910) is provided with a blocking surface composed of an insulator facing the single-pole blocking unit, thereby preventing arc gas generated from the single-pole blocking unit from being applied to conductors such as the fix core (593) of the trip device (390), and as a result, can improve the inter-phase insulation performance of the trip device (390). The trip base (910) composed of an insulator can form a blocking surface not only on the surface facing the single-pole blocking unit but also on the left and right sides of each phase. An inter-phase gap (950) can be formed between the left and right sides of the trip base (910). A third insulating partition (449) can be inserted into the inter-phase gap (950) of the trip base (910). The third insulating partition (449) can fix the trip base (910), i.e., the trip device (390), to the circuit breaker base (340) and improve the inter-phase insulation of the trip device (390).

[0082] The trip base (910) can be configured with the side of the heater (591), which is difficult for arc gas to reach, open. The trip base (910) includes an opening for a load-side wire (592) on the side of the single-pole blocking unit, so that the protruding load-side wire (592) can be connected to the load-side terminal (570) of the single-pole blocking unit.

[0083] The trip base (910) includes an exhaust groove (930) in the lower part that communicates with the second exhaust port (580) of the single-pole blocking unit. The trip base (910) may have a coupling groove (893) that engages with the catch (883) of the single-pole blocking unit in the part constituting the exhaust groove (930).

[0084] FIG. 10 is a photograph showing the state of the circuit breaker base after a withstand voltage test of a circuit breaker including a double partition for inter-phase insulation according to one embodiment.

[0085] To test the withstand voltage of a circuit breaker, a high voltage of 2000V or more was applied between phases or poles of the circuit breaker, and the tripping device was operated to repeat the supply and interruption of power a certain number of times, after which the voltage holding characteristics were checked. In the same experiment, a conventional product without an insulating barrier used as a comparative example failed to hold the voltage due to tracking, but the circuit breaker according to one embodiment succeeded in holding the voltage as no tracking occurred.

[0086] Referring to FIG. 10, arc gas was applied to the circuit breaker base (340) of a circuit breaker according to one embodiment after a pressure test, but no tracking phenomenon occurred on the bottom surface. This is because the insulation performance of the circuit breaker was improved by including a first insulating partition (443, 445) and a second insulating partition (447) in the circuit breaker base (340). In particular, the tracking phenomenon can be prevented by forming the first insulating partition (443, 445), specifically the arc-shaped partition portion (445) close to the bottom surface, as a double partition to lengthen the current path.

[0087] Although the present invention has been described above with reference to embodiments with reference to the accompanying drawings, it is not limited thereto and should be interpreted to encompass various variations that can be obviously derived from them by those skilled in the art. The claims are intended to encompass such variations. Explanation of the symbols

[0088] 305: Circuit breaker cover 310: Switching mechanism 320: Single-pole circuit breaker unit 340: Circuit breaker base 390: Trip device 441: First insulating bulkhead 443: Rectangular bulkhead 445: Arc-shaped bulkhead 447: Second insulating bulkhead 449: Third insulating bulkhead 520: 1st exhaust port 525: 1st arc extinguishing section 530: First terminal 535: First fixed contact part 540: Bottom surface of the circuit breaker 553: First movable contact 555 : Rotation axis 556 : Rotating bar 557 : Second movable contact part 560 : Shaft assembly 565 : Rotating pin 570: Second terminal 575: Second fixed contact part 580: Second exhaust port 585: Second arc extinguishing section 883 : Locking tab 893 : Connecting groove 910 : Trip base 930 : Trip device exhaust groove

Claims

Claim 1 A circuit breaker for wiring including a double partition for inter-phase insulation comprises: a plurality of single-pole blocking units each having a first terminal and a second terminal connected to a power source and a load of each phase, and a shaft assembly capable of rotating around a rotation axis to interrupt the current state between the first terminal and the second terminal; a plurality of tripping devices each having a conductor portion connected to the second terminal of each of the plurality of single-pole blocking units and operating to interrupt the current state of the plurality of single-pole blocking units when an overcurrent flows through the conductor portion; a circuit breaker base in which the plurality of single-pole blocking units and the plurality of tripping devices are mounted internally; and a circuit breaker cover coupled to the upper part of the circuit breaker base and covering the upper outer surface of the plurality of single-pole blocking units and the plurality of tripping devices; wherein the single-pole blocking unit comprises a first fixed contact portion connected to the first terminal; and further comprising a second fixed contact portion connected to the second terminal; wherein the shaft assembly comprises a rotating bar having a first movable contact portion at one end that contacts the first fixed contact portion and a second movable contact portion at the other end that contacts the second fixed contact portion; and a rotating pin that simultaneously rotates a plurality of first movable contact portions and a plurality of second movable contact portions; and wherein the circuit breaker base comprises a double partition consisting of two plate-shaped members of the same shape arranged in parallel, a first insulating partition disposed between the first fixed contact portions of each phase of the plurality of single-pole blocking units; a second insulating partition consisting of a single partition consisting of one plate-shaped member connected to the first insulating partition and disposed between the second fixed contact portions of each phase of the plurality of single-pole blocking units; and a third insulating partition formed below the second insulating partition and disposed in the space between the trip bases of the trip device.A circuit breaker for wiring, comprising: a second insulating partition wall formed higher than the first insulating partition wall, and a third insulating partition wall formed thicker than the second insulating partition wall with a width equal to the gap between the plurality of single-pole blocking units; an exhaust duct formed protruding toward the trip device to discharge arc vapor generated at the second fixed contact portion; and a catch projection formed protruding from the outer edges of the exhaust duct in three directions (upper, left, and right); wherein the trip device comprises a coupling groove formed concavely in the interior of the upper, left, and right directions to engage with the catch projection at a position where it is coupled to the exhaust duct of the single-pole blocking unit. Claim 2 A circuit breaker for wiring according to claim 1, wherein the first insulating partition comprises: a rectangular partition portion disposed next to the first fixed contact portion; and an arc-shaped partition portion configured in a downwardly concave arc shape so as not to hinder the rotation of the shaft assembly. Claim 3 A circuit breaker for wiring according to claim 2, wherein the rectangular partition is formed higher than the height of the first fixed contact part. Claim 4 In claim 2, the arc-shaped bulkhead is a wiring circuit breaker in which the height of the lowest point of the arc is formed lower than the height of the lowest point of the rotating pin. Claim 5 delete Claim 6 A circuit breaker for wiring according to claim 1, wherein the second insulating partition is formed higher than the height of the second fixed contact portion. Claim 7 delete Claim 8 A circuit breaker for wiring according to claim 1, wherein the trip device comprises a trip base that blocks the surface in contact with the single-pole blocking unit so that the internal conductors are not exposed toward the single-pole blocking unit. Claim 9 delete

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