Molded case circuit breaker

Abstract

The present invention provides a molded case circuit breaker comprising: a frame portion; a switching mechanism which allows a mover positioned in the frame portion, to come into contact with or separate from a stator; a pressure trip device which is provided with a shooter providing force for triggering the switching mechanism, and operates the switching mechanism to a trip position when a fault current occurs; and a reset lever portion which comes into contact with one side of the shooter and provides the shooter with a restoring force.

Description

Circuit breaker for wiring

[0001] The present invention relates to a wiring circuit breaker having improved short-circuit performance of the circuit breaker.

[0002] A circuit breaker is a device designed to automatically shut off a circuit when current exceeding the rated current flows through it, preventing accidents caused by overcurrent. Among these, molded case circuit breakers (MCCBs) are installed in wiring and housed within a molded case.

[0003] A circuit breaker for wiring includes a fixed terminal portion that is electrically connected to an external power source or load, and a movable terminal portion that is electrically connected or separated from the fixed terminal portion.

[0004] When an overcurrent flows through a circuit breaker, the fixed terminal and the movable terminal are separated, and the current is interrupted. This is called a trip process, and the device that performs the trip process is called a trip device.

[0005] In a circuit breaker according to the prior art, when an overcurrent is applied, a shooter provided in a detection mechanism rotates.

[0006] When a normal current is applied, the shooter binds the nail. However, when a higher current than the normal current is applied, the nail is released from the shooter and rotates as the shooter rotates, and the mechanism connected to the nail also rotates.

[0007] That is, in the case of a conventional wiring circuit breaker, when a fault current occurs and a circuit breaker is operated, an arc generated between the fixed contact of the fixed terminal section and the movable contact of the movable terminal section is guided to an arc extinguishing chamber and the arc is extinguished by expansion and cooling.

[0008] This sequential mechanism causes the moving and fixed contacts to be damaged by prolonged exposure to the arc during the breaking operation, which may lead to future defects such as abnormal current conduction and temperature rise.

[0009] To solve these problems, improvements will be made to reduce the blocking time by inserting a Pressure Trip device (shooter, PT shooter).

[0010] Specifically, the arc pressure generated during an accident current flows into the pressure trip device (PT Shooter ASS'Y) through the inlet, the introduced arc pressure operates the shooter, and the nail rotated by the action of the shooter operates the mechanism to implement physical blocking.

[0011] To summarize the above, it is as follows.

[0012] Accident current generation → Arc pressure flows into the trip device → PT shooter operates → Nail is released → Mechanism operates

[0013] Additionally, after the shooter action, the trip device returns to its initial position by the return spring within the trip device.

[0014] However, the circuit breaker for the above wiring may have a defect in that the shooter part, which is a plastic raw material, sticks to the case or cover of the pressure trip device due to high temperature arc pressure and does not return, preventing the circuit breaker from operating.

[0015] Additionally, the return spring may deteriorate, which may cause the trip device to malfunction, and furthermore, this may cause a decrease in the reliability of the trip device return operation.

[0016] Additionally, during the tripping process, circuit breakers release gases and carbonized substances through the shooter. These carbonized substances can contaminate the circuit breaker's interior. If these carbonized substances adhere to the circuit breaker's insulating material, insulation performance deteriorates and a short circuit between phases can occur.

[0017] Therefore, in the past, attempts were made to resolve the reset failure itself by changing the raw material of the shooter or changing the structure of the shooter itself in response to the reset failure that occurred after the shooter operation of the circuit breaker.

[0018] However, in the case of changes in the raw materials of internal components or changes in the structure of the shooter, it is not only uneconomical because it incurs a lot of cost during product implementation, but also has limitations in that the same problem may recur because there is no countermeasure for reset failure that may occur even when the structure of the shooter is changed.

[0019] Korean Patent Application No. 20-2024-0000375 (hereinafter, Patent Document 1) discloses a circuit breaker having a pressure trip device, which includes a case coupled to one side of a base assembly and having an arc inlet hole formed therein and communicating with an arc discharge hole of the base assembly; a trip shooter inserted into the case so as to be able to move up and down; a rotary plate rotatably installed in the case to push up the trip shooter and open and close the arc inlet hole; and a cover coupled to the case.

[0020] Patent Document 1 is configured to prevent trip operation failure by minimizing the inflow of arc flying products or foreign substances into the inside of the pressure trip device by closing the inside of the pressure trip device by a rotating plate after the arc gas is introduced.

[0021] That is, Patent Document 1 is a design that was created to prevent the reset failure itself from occurring by changing the structure of the shooter as a solution to the reset failure that occurs after the shooter operation.

[0022] Accordingly, Patent Document 1 does not include a separate operating means configured to perform a reset operation even when a problem causing a reset failure occurs.

[0023] Korean Patent Application No. 10-2016-0039998 (hereinafter, Patent Document 2) comprises: a housing forming the outer appearance of a mechanism; a yoke installed inside the housing; a yoke plate coupled to the upper portion of the yoke and having a hollow portion formed therein; a bobbin comprising a body formed of a cylindrical tube and an upper plate and a lower plate, the bobbin being installed between the yoke and the yoke plate; a coil wound around the body of the bobbin; a movable core formed with a step such that the upper diameter is larger than the lower diameter in the longitudinal direction, and is inserted through the body of the bobbin to enable up and down movement; a latch moved by the movable core and driving the mechanism; a spring fixed to the lower portion of the yoke, surrounding the lower outer surface of the movable core, the spring having a diameter smaller than the upper diameter of the movable core, and having an elastic force that pushes the movable core upward; a magnetic body installed at the lower portion of the yoke and attracting the movable core with a magnetic force; A voltage trip device is disclosed, which includes a control device having a control holder in contact with the movable core and pressing the movable core downward.

[0024] Patent Document 2 adopts a control holder and a control elastic member capable of controlling the force pressing the movable core, so that when the operating characteristics of the actuator change due to the dispersion of the parts or the change in the characteristics of the parts over time, the control holder and the control elastic member can be controlled to adjust the operating characteristics to a specific standard without replacing the parts.

[0025] However, even in the case of Patent Document 2, as a solution to a reset failure that occurs after the shooter operation, a separate operating means configured to enable a reset operation to be performed even when a reset failure occurs is not included.

[0026] Accordingly, as a solution to the reset failure in which the circuit breaker does not operate due to the shooter part, which is a plastic raw material, sticking to the case or cover of the pressure trip device and not being restored by high temperature arc pressure, there is a need for the development of a wiring circuit breaker that includes a separate configuration that can resolve the reset failure when it occurs, thereby preventing the trip device from malfunctioning and further improving the reliability of the trip device's reset operation.

[0027] The present invention has been devised to solve the above-mentioned problem, and the purpose of the present invention is to provide a wiring circuit breaker that includes a separate configuration that is designed to enable a reset operation to be performed even when a reset failure occurs, thereby preventing malfunction of a trip device and, further, improving the reliability of a trip device recovery operation.

[0028] In addition, the purpose of the present invention is to provide a wiring circuit breaker configured so that a reset operation is performed by applying pressure in the reset direction to the shooter of the pressure trip device, as a solution to a reset failure in which the circuit breaker does not operate because the shooter part, which is a plastic raw material, is stuck to the case or cover of the pressure trip device due to high temperature arc pressure and does not return.

[0029] In addition, an object of the present invention is to provide a wiring circuit breaker that is simple and economical in cost by including a separate configuration that can solve a reset failure.

[0030] In order to solve the above problem, the circuit breaker of the present invention comprises: a frame part; a switching mechanism part that contacts or separates a movable part located inside the frame part from a stator; a pressure trip device part that has a shooter that provides a force for triggering the switching mechanism part and operates the switching mechanism part to a trip position when a fault current occurs; and a reset lever part that contacts one side of the shooter and provides a restoring force to the shooter.

[0031] According to an example related to the present invention, the opening / closing mechanism includes a nail rotatably coupled to the frame portion to perform a trip operation; and a lever that rotates in a direction toward the nail or in a direction opposite to the nail.

[0032] According to another example related to the present invention, the pressure trip device unit includes a housing having an inlet; a shooter installed longitudinally inside the housing so that a certain portion of the upper side is exposed to the outside, and moves in one direction by gas introduced into the housing; and a first elastic member having one side supported by the housing and the other side in contact with one side of the shooter to elastically support the shooter.

[0033] Preferably, the housing includes a gas passage communicating with the inlet and through which the introduced gas flows, and the shooter has a lower portion accommodated within the gas passage.

[0034] In addition, the reset lever part includes a body having a certain area; a connecting hole formed horizontally through the body; and a second elastic member horizontally arranged in the connecting hole so as to be coupled to one side of the connecting hole, and a cross pin penetratingly installed in the frame part is disposed in the connecting hole on the other side thereof.

[0035] In addition, the body includes a first body having the connecting hole; and a second body formed longitudinally and connected to the upper end of the first body, and receiving pressure from the lever.

[0036] Preferably, the second body includes a pressure step formed on one side corresponding to the lever and in direct contact with the lever.

[0037] Additionally, the second body has a sloped surface with a side of the second body corresponding to the shooter inclined at a certain angle.

[0038] Additionally, the second elastic member is a coil spring.

[0039] In addition, the second elastic member has a horizontal length such that one side is connected to one side of the connecting hole and the other side is in contact with one side of the cross pin.

[0040] Additionally, the reset lever portion includes a support protrusion protruding from one side of the connecting hole and into which one side of the second elastic member is inserted and fixed.

[0041] In addition, the lever includes a handle; a handle cam in the shape of a plate extending downward from the handle; and a handle engaging member inserted into the handle cam and performing the function of a central axis of the rotating handle, and the handle cam includes a pressing projection formed on one side corresponding to the reset lever portion and in facing contact with the reset lever portion.

[0042] The circuit breaker for wiring of the present invention has the advantage of preventing malfunction of a trip device and, further, improving the reliability of the trip device return operation.

[0043] In addition, the circuit breaker for wiring of the present invention includes a reset lever section that applies pressure in the reset direction to the shooter of the pressure trip device section, so that even in the event of a reset failure in which the shooter section, which is a plastic raw material, sticks to the case or cover of the pressure trip device due to high temperature arc pressure and does not return, a reset operation is performed.

[0044] In addition, the circuit breaker for wiring of the present invention has a simple and economical configuration and has the effect of efficiently performing a trip device recovery operation.

[0045] Fig. 1 is a perspective view showing the overall configuration of a circuit breaker for wiring of the present invention.

[0046] Figure 2 is an exploded perspective view showing the overall configuration of the wiring circuit breaker of the present invention.

[0047] Figure 3 is an exploded perspective view showing the detailed configuration of the wiring circuit breaker (S phase) of the present invention.

[0048] Fig. 4 is a front view showing the configuration of a circuit breaker for wiring of the present invention.

[0049] Fig. 5 is a cross-sectional view showing the detailed configuration of the single-pole blocking unit and arc extinguishing unit of the present invention.

[0050] Fig. 6 is a perspective view showing the detailed configuration of the reset lever portion of the present invention.

[0051] Fig. 7 is a front view showing the detailed configuration of the reset lever portion of the present invention.

[0052] Figure 8 is a first state diagram showing the operating state of the opening / closing mechanism and reset lever of the present invention during a reset operation.

[0053] Figure 9 is a second state diagram showing the operating state of the opening / closing mechanism and reset lever of the present invention during a reset operation.

[0054] Figure 10 is a third state diagram showing the operating state of the opening / closing mechanism and reset lever of the present invention during a reset operation.

[0055] Fig. 11 is an internal perspective view showing the detailed configuration of the pressure trip device of the present invention.

[0056] Fig. 12 is a front view showing the detailed configuration of the pressure trip device of the present invention.

[0057] Hereinafter, a wiring circuit breaker (1) related to the present invention will be described in more detail with reference to the drawings.

[0058] In this specification, identical or similar components are assigned identical or similar reference numbers even in different embodiments, and redundant descriptions thereof are omitted.

[0059] Additionally, even if the embodiments are different, a structure applied to one embodiment can be applied to another embodiment as long as there is no structural or functional contradiction.

[0060] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0061] In describing the embodiments disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the embodiments disclosed in this specification, the detailed description is omitted.

[0062] The attached drawings are only intended to facilitate understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

[0063] Fig. 1 is a perspective view showing the overall configuration of a circuit breaker for wiring of the present invention, Fig. 2 is an exploded perspective view showing the overall configuration of a circuit breaker for wiring of the present invention, Fig. 3 is an exploded perspective view showing the detailed configuration of a circuit breaker for wiring of the present invention (S phase), and Fig. 4 is a front view showing the configuration of a circuit breaker for wiring of the present invention.

[0064] Below, with reference to FIGS. 1 to 4, the wiring circuit breaker (1) of the present invention will be described.

[0065] A wiring circuit breaker (1) can allow or block current flow between an external power source and a load. To this end, the wiring circuit breaker (1) is connected so that current can flow between the external power source and the load.

[0066] When a current higher than the rated current is applied, the fixed contact (211) and the movable contact (221) (see Fig. 5) of the circuit breaker (1) for wiring may be separated from each other. This process is called a trip process. At this time, the external power source and load are not connected to each other, so that damage to the power source or load due to overcurrent can be prevented.

[0067] Referring to FIGS. 1 to 4, a circuit breaker (1) for wiring according to one embodiment of the present invention includes a frame portion (100), a single-pole circuit breaker portion (200) (see FIG. 5), a switching mechanism portion (300), a pressure trip device portion (400), and a reset lever portion (500).

[0068] The frame (100) forms the exterior of the wiring circuit breaker (1). Accordingly, a space is formed inside the frame (100). Each component provided for the operation of the wiring circuit breaker (1) can be accommodated in the space. Specifically, the space accommodates a single-pole circuit breaker (200) and an arc extinguishing unit (700) (see FIG. 5). In addition, a switching mechanism unit (300) and a pressure tripping device unit (400) can be rotatably coupled to the frame (100).

[0069] In the illustrated embodiment, the frame portion (100) is formed in a box shape.

[0070] The frame portion (100) may include any connecting means (not shown) so that the pressure trip device portion (400) is mounted on one side of the outer circumference of the frame portion. In the illustrated embodiment, the pressure trip device portion (400) is mounted on the front (left side in the drawing) side of the frame portion.

[0071] Although not shown, the frame portion (100) may have a gas hole formed through one side.

[0072] A gas hole (not shown) connects the internal space of the frame portion (100) and the external space of the frame portion (100). In the illustrated embodiment, a plurality of gas holes are formed through one surface where a plurality of frame portions (100) face each other.

[0073] When the opening / closing mechanism (300) and the pressure trip device (400) are operated, the single-pole circuit breaker (200) housed in the internal space of the frame (100) rotates, generating an arc and gas. The generated arc passes through the arc extinguishing unit (700) and is extinguished, and then flows to the external space of the frame (100) through the gas hole (not shown). (See Fig. 5)

[0074] In one embodiment, a plurality of frame parts (100) may be provided. The plurality of frame parts (100) may be arranged in parallel in a predetermined direction. In this case, two adjacent frame parts (100) are spaced apart from each other by a predetermined distance.

[0075] Referring to FIGS. 1 and 2, four frame parts (100) are provided and are arranged in a parallel manner in the left and right directions. This is because four phase currents of R phase, S phase, T phase, and N phase are passed through the wiring circuit breaker (1) according to the embodiment of the present invention.

[0076] However, the frame part (100) may be changed depending on the type of phase of the current flowing through the wiring circuit breaker (1). Accordingly, although not shown, three frame parts (100) may be arranged so that three phases of current, R phase, S phase, and T phase, flow through them.

[0077] In addition, the frame parts (100) of the R phase, S phase, T phase, and N phase each have a single-pole blocking part (200) placed inside. (See Fig. 5)

[0078] In addition, the configuration of the opening / closing mechanism (300), the pressure trip device (400), and the reset lever (500) is installed in the S-phase frame (100).

[0079] Fig. 5 is a cross-sectional view showing the detailed configuration of the single-pole blocking unit and arc extinguishing unit of the present invention.

[0080] Referring to FIG. 5, a single-pole blocking unit (200) is located inside the frame unit (100), and a stator (210) and a mover (220) may be provided.

[0081] A single-pole circuit breaker (200) allows or blocks current flow between a circuit breaker (1) for wiring and an external power source or load. The current flow is achieved through contact between a stator (210) and a movable member (220).

[0082] Additionally, the above blocking is achieved by separating the stator (210) and the movable member (220).

[0083] The single-pole circuit breaker (200) is accommodated in the internal space of the frame (100).

[0084] The single-pole circuit breaker (200) is placed adjacent to the arc extinguishing unit (700).

[0085] The single-pole circuit breaker (200) is connected to an external power source and load so that it can be energized.

[0086] A plurality of single-pole blocking units (200) may be provided. The plurality of single-pole blocking units (200) may be accommodated in each of the plurality of frame parts (100). In the illustrated embodiment, four single-pole blocking units (200) are provided and accommodated in each of the four frame parts (100).

[0087] In addition, the single-pole circuit breaker (200) is connected to the switching mechanism (300). When the switching mechanism (300) is operated, the single-pole circuit breaker (200) is also operated, thereby cutting off the current between the wiring circuit breaker (1) and an external power source or load.

[0088] The single-pole blocking portion (200) may be formed of a conductive material. For example, the single-pole blocking portion (200) may be formed of copper (Cu), silver (Ag), or the like.

[0089] In the embodiment illustrated in FIG. 5, the single-pole circuit breaker (200) includes a stator (210), a mover (220), and a rotating shaft (230).

[0090] The stator (210) and the movable member (220) are in contact with or spaced apart from each other to allow or block the current of the circuit breaker (1). The contact or separation can be achieved by rotating the rotating shaft (230).

[0091] The stator (210) is electrically connected to an external power source or load.

[0092] Through the stator (210), the wiring circuit breaker (1) can be connected to an external power source or load.

[0093] A portion of the stator (210) is accommodated in the internal space of the frame portion (100).

[0094] At this time, the stator (210) does not move in the internal space of the frame part (100). Therefore, the contact and separation between the stator (210) and the movable member (220) is achieved by the movement of the movable member (220).

[0095] Except for the above-mentioned part of the stator (210), the remaining part is exposed to the outside of the frame part (100). The remaining part can be electrically connected to an external power source or load by a conductor member (not shown) or the like.

[0096] A plurality of stators (210) may be provided. In the illustrated embodiment, two stators (210) are provided and are respectively positioned on the front and rear sides of the frame portion (100). In addition, in the above embodiment, the two stators (210) are arranged to be symmetrical with respect to the central axis of the rotating shaft (230).

[0097] A plurality of stators (210) can be electrically connected to each other. The connection is formed by a plurality of movable elements (220) each coming into contact with a plurality of stators (210).

[0098] The stator (210) is positioned adjacent to the arc-extinguishing unit (700). In the embodiment illustrated in FIG. 5, the stator (210) positioned on the front side (left side in the drawing) is positioned above the arc-extinguishing unit (700). In addition, the stator (210) positioned on the rear side (right side in the drawing) is positioned below the arc-extinguishing unit (700).

[0099] In the illustrated embodiment, the stator (210) includes a fixed contact (211) and a fixed contact band (212).

[0100] The fixed contact (211) is in contact with or separated from the movable contact (221). Accordingly, the wiring circuit breaker (1) can be connected to or disconnected from an external power source or load.

[0101] The fixed contact (211) is electrically connected to the fixed contact block (212). The fixed contact (211) is arranged adjacent to the fixed contact block (212).

[0102] The fixed contact (212) is connected to an external power source or load so that it can be energized.

[0103] The fixed contact (212) is electrically connected to the fixed contact (211).

[0104] In the illustrated embodiment, the fixed contact (211) arranged on the front side (left side in the drawing) is located on the lower side of the fixed contact plate (212), and the fixed contact (211) arranged on the rear side (right side in the drawing) is located on the upper side of the fixed contact plate (212).

[0105] The movable element (220) is energized and connected to or separated from the stator (210). Through the movable element (220), a plurality of stators (210) can be energized and connected to each other. Consequently, the wiring circuit breaker (1) can be energized and connected to an external power source or load.

[0106] The movable member (220) is accommodated in the internal space of the frame member (100). The movable member (220) is movably coupled to the internal space of the frame member (100).

[0107] The actuator (220) is coupled to the rotary shaft (230). When the rotary shaft (230) rotates, the actuator (220) can also rotate together with the rotary shaft (230).

[0108] The movable member (220) is electrically connected to the rotating shaft (230). Therefore, current flowing through the stator (210) can be transmitted to the movable member (220) and the rotating shaft (230).

[0109] A plurality of actuators (220) may be provided. In the illustrated embodiment, the wiring circuit breaker (1) is provided with two actuators (220), which are respectively positioned on the front and rear sides of the frame portion (100). In addition, in the above embodiment, the two actuators (220) are arranged to be symmetrical with respect to the central axis of the rotating shaft (230).

[0110] A plurality of movers (220) can be electrically connected to or separated from a plurality of stators (210).

[0111] That is, the actuator (220) can be rotated to come into contact with the stator (210) or rotated to be separated from the stator (210). The contact and separation can be achieved by the rotation of the rotating shaft (230) to which the actuator (220) is connected.

[0112] The actuator (220) is placed adjacent to the arc-protecting section (700).

[0113] In the illustrated embodiment, the movable member (220) positioned on the front side (left side in the drawing) is positioned adjacent to the arc-extinguishing member (700) on the lower side of the stator (210), and the movable member (220) positioned on the rear side (right side in the drawing) is positioned adjacent to the arc-extinguishing member (700) on the upper side of the stator (210).

[0114] In the above embodiment, the actuator (220) may be spaced apart from the stator (210) as the rotary shaft (230) rotates counterclockwise. Conversely, when the rotary shaft (230) rotates clockwise, the actuator (220) may come into contact with the stator (210).

[0115] In the illustrated embodiment, the actuator (220) includes a movable contact (221) and a movable contact member (222).

[0116] The movable contact (221) is in contact with or separated from the fixed contact (211). Accordingly, the wiring circuit breaker (1) can be connected to or disconnected from an external power source or load.

[0117] The movable contact (221) is electrically connected to the movable contact block (222). The movable contact (221) is positioned adjacent to the movable contact block (222).

[0118] The movable contact (222) is electrically connected to the rotating shaft (230).

[0119] When the rotating shaft (230) rotates, the movable contact member (222) can also rotate. Accordingly, the movable contact member (222) can rotate in a direction toward the stator (210) or in a direction opposite to the stator (210).

[0120] In the illustrated embodiment, a plurality of movable contacts (222) are provided, and are respectively connected to the front side and the rear side of the rotating shaft (230). The movable contacts (222) arranged on the front side are electrically contactable with or spaced apart from the stator (210) located on the front side. The movable contacts (222) arranged on the rear side are electrically contactable with or spaced apart from the stator (210) located on the rear side.

[0121] The movable contact (222) is electrically connected to the movable contact (221).

[0122] In the illustrated embodiment, the movable contact (221) arranged on the front side is located on the upper side of the movable contact plate (222), and the movable contact (221) arranged on the rear side is located on the lower side of the movable contact plate (222).

[0123] In one embodiment, the movable contact (221) may be formed integrally with the movable contact plate (222).

[0124] Referring to FIGS. 2 to 4, the opening / closing mechanism (300) is arranged adjacent to the single-pole circuit breaker (200) and is configured to contact or separate the movable member (220) from the stator (210).

[0125] When overcurrent is applied, the switching mechanism (300) operates together with the pressure trip device (400) to cut off the current between the circuit breaker (1) and an external power source or load.

[0126] Therefore, the opening / closing mechanism (300) is connected to the pressure trip device (400).

[0127] When the pressure trip device (400) rotates and operates, the opening / closing mechanism (300) can also rotate.

[0128] In addition, the switching mechanism (300) is also connected to the single-pole circuit breaker (200). When the switching mechanism (300) is rotated and operated, the movable contact (221) can be separated from the fixed contact (211). Accordingly, the wiring circuit breaker (1) is electrically separated from an external power source or load.

[0129] During the operation of the opening / closing mechanism (300), the arc generated in the internal space of the frame (100) passes through the arc extinguishing section (700) and is extinguished, and then discharged to the outside through the gas hole of the frame (100).

[0130] Referring to FIGS. 3 and 4, the opening / closing mechanism (300) includes a nail (310) and a lever (320).

[0131] The nail (310) is configured to be rotatably connected to the frame portion (100) and perform a trip operation.

[0132] The nail (310) can be rotated toward the pedal (not shown) or in the opposite direction to the pedal (not shown) by the pressure trip device (400).

[0133] In a state where normal current is applied, the nail (310) restrains the pedal (not shown). At this time, the pedal (not shown) is prevented from rotating arbitrarily by the restraint of the nail (310).

[0134] As the nail (310) rotates, the pedal (not shown) is released from the nail (310) and rotates, and the handle (321) connected to the pedal (not shown) also rotates. Through the above process, when an overcurrent is applied to the circuit breaker (1) for wiring, the current flow between the external power source and the load can be cut off.

[0135] Additionally, if the nail (310) is rotated in the opposite direction to the above process, the pedal (not shown) is re-bound to the nail (310) and can be returned to the initial state together with the handle (321).

[0136] The nail (310) may be formed of a high-strength material. For example, the nail (310) may be formed of a metal material. This is to prevent the nail (310) from being physically damaged when the pedal (not shown) is pressed or when the pressure trip device (400) is pressed.

[0137] The lever (320) is coupled to the frame portion (100) so as to be rotatable toward or against the nail (310).

[0138] The lever (320) performs an operation in which the pressure trip device (400) performing the trip operation returns to the initial state.

[0139] Specifically, the lever (320) is a device for a user to manually perform a trip operation of the circuit breaker (1) when an overcurrent occurs. The lever (320) is rotated by an external force to allow or block current flow between the circuit breaker (1) and an external power source and load.

[0140] That is, when the pressure trip device (400) strikes the nail (310), the nail (310) rotates and the pedal (not shown) is released. At this time, as the released pedal (not shown) rotates, the lever (320) rotates together with the pedal (not shown), allowing the user to easily recognize the status of the wiring circuit breaker (1) from the outside.

[0141] Additionally, in the above state, when the lever (320) is pressed again and rotated, it returns to the initial state before the trip operation is performed.

[0142] The lever (320) is partially exposed on the outside of the frame portion (100). The user can easily recognize the operating status of the circuit breaker (1) through the exposed portion of the lever (320).

[0143] Additionally, the user can determine whether the circuit breaker (1) for wiring is operated through the lever (320). That is, the user can control the state of the circuit breaker (1) to “ON,” “OFF,” or “TRIP,” etc., by operating the lever (320).

[0144] In the illustrated embodiment, the lever (320) includes a handle (321), a handle cam (322), and a handle engaging member (323).

[0145] The handle (321) has the shape of a handle and is shaped like a lever (320).

[0146] The handle (321) is connected to the frame portion (100) so as to be rotatable about the handle coupling member (323). In addition, the handle (321) is connected so as to be rotatable relative to the handle coupling member (323).

[0147] The handle (321) can be rotated toward the nail (310) or away from the nail (310).

[0148] The handle (321) is partially exposed to the outside of the frame portion (100). Therefore, the user can easily operate the wiring circuit breaker (1) by gripping the handle (321) and applying pressure to the front side (left side in the drawing) or the rear side (right side in the drawing).

[0149] In one embodiment, the handle (321) may be formed to have an arc-shaped cross-section with a predetermined curvature.

[0150] The handle cam (322) is a plate-shaped configuration extending downward from both sides of the handle (321).

[0151] The handle cam (322) can generate rotational motion in the handle (321) that is separated from the handle coupling member (323).

[0152] The handle cam (322) is positioned between the handle coupling member (323) and the handle (321), and is coupled to the handle coupling member (323) and the handle (321), respectively. In the illustrated embodiment, the handle (321) is positioned above the handle cam (322), and the handle coupling member (323) is positioned below the handle cam (322). That is, the handle (321), the handle cam (322), and the handle coupling member (323) are positioned sequentially from the upper side to the lower side.

[0153] The handle cam (322) is interlocked with the handle (321) and rotates together with the handle (321) when rotated.

[0154] The handle cam (322) is formed in a curved plate shape.

[0155] Additionally, the handle cam (322) includes a pressure projection (322a) in the shape of a curved projection on one side corresponding to the reset lever portion (500).

[0156] The pressure projection (322a) may be a surface that provides pressure, i.e., restoring force, to move the reset lever portion (500) by coming into contact with the pressure step (5121) (see FIG. 7) of the reset lever portion (500) to be described later when the opening / closing mechanism portion (300) rotates. (see FIGS. 8 to 10)

[0157] Accordingly, the pressure projection (322a) has a size and shape that can be in direct contact with the first surface (5121a) of the pressure step (5121), which will be described later.

[0158] The handle coupling member (323) is inserted into the handle cam (322) and serves as the central axis of the rotating handle (321) and handle cam (322).

[0159] Therefore, the handle coupling member (323) is placed on the lower side of the handle cam (322).

[0160] In addition, the handle coupling member (323) is connected to the frame part (100) through a penetration connection, thereby being connected to the frame part (100). In summary, the handle coupling member (323) serves as a rotation axis of the handle cam (322).

[0161] Fig. 11 is an internal perspective view showing the detailed configuration of the pressure trip device of the present invention, and Fig. 12 is a front view showing the detailed configuration of the pressure trip device of the present invention.

[0162] The pressure trip device (400) is configured to have a shooter (420) that provides force for triggering the opening / closing mechanism (300), thereby operating the opening / closing mechanism (300) to a trip position when an accident current occurs.

[0163] That is, when an overcurrent is applied to the circuit breaker (1) for wiring, the pressure trip device (400) is operated by a means for detecting this and performs a trip operation.

[0164] Referring to FIGS. 2 and 3, the pressure trip device (400) is coupled to one side of the front outer surface of the frame (100).

[0165] In addition, the pressure trip device (400) includes a housing (410), a shooter (420), and a first elastic member (430) as shown in FIGS. 11 and 12.

[0166] The housing (410) is a configuration of the exterior of the pressure trip device (400) having an inlet (411) on one side.

[0167] Additionally, the housing (410) is formed in a roughly rectangular box shape. The housing (410) may be formed of a synthetic resin material.

[0168] The housing (410) includes a gas passage (412) through which the introduced gas flows.

[0169] The gas path (412) is connected to the inlet (411).

[0170] The gas path (412) is formed by grooves running in the vertical direction.

[0171] Additionally, a portion of the lower side of the shooter (420) is accommodated in the gas passage (412), so that the shooter (420) can move in one direction by the pressure of the introduced gas.

[0172] The shooter (420) is installed longitudinally inside the housing (410) so that a certain portion of the upper side is exposed to the outside, and is configured to move in one direction by gas introduced into the housing (410).

[0173] That is, the shooter (420) is configured to transmit rotational motion to the opening / closing mechanism (300) when the pressure trip device (400) performs a trip operation.

[0174] Accordingly, the shooter (420) presses the nail (310). When overcurrent flows through the circuit breaker (1), the shooter (420) presses the nail (310), and the opening / closing mechanism (300), including the handle (321), rotates so that the user can easily recognize the circuit breaker (1).

[0175] Conversely, when the handle (321) is pressed back to its initial state by an external force, the shooter (420) that was pressing the nail (310) can return to its initial state. Accordingly, the nail (310) is also returned to its initial state.

[0176] Therefore, the shooter (420) is positioned adjacent to the nail (310).

[0177] The shooter (420) is coupled to the housing (410) so as to be movable toward or away from the nail (310).

[0178] When the shooter (420) moves toward the nail (310), it comes into contact with the nail (310) and presses the nail (310). The movement of the shooter (420) ends when the shooter (420) comes into contact with the inner surface of the housing (410).

[0179] Conversely, when the reset lever (500) presses the shooter (420) during the reset operation, the shooter (420) moves in the opposite direction to the nail (310). Accordingly, the shooter (420) can be returned to its initial state. The shooter (420) can be moved until it comes into contact with the inner surface of the housing (410).

[0180] Additionally, the shooter (420) can be formed into any shape capable of pressing the nail (310).

[0181] The first elastic member (430) is configured such that one side is supported by the housing (410) and the other side comes into contact with one side of the shooter (420) to elastically support the shooter (420).

[0182] Specifically, the first elastic member (430) is an elastic spring arranged on one side of the shooter (420), and is configured such that both ends are joined to the inner surface of the shooter (420) and the housing (410) to provide restoring force to the moving shooter (420).

[0183] That is, the first elastic member (430) is accommodated in the internal space of the housing (410).

[0184] Additionally, the first elastic member (430) is provided in the form of a coil spring.

[0185] In addition, the first elastic member (430) can be applied without limitation to a known elastic member having the same effect as a coil spring.

[0186] That is, the first elastic member (430) can be provided in any shape that can store restoring force through compression and tension and provide restoring force stored in other members.

[0187] FIG. 6 is a perspective view showing a detailed configuration of a reset lever portion of the present invention, FIG. 7 is a front view showing a detailed configuration of a reset lever portion of the present invention, FIG. 8 is a first state diagram showing the operating state of the opening / closing mechanism portion and the reset lever portion of the present invention during a reset operation, FIG. 9 is a second state diagram showing the operating state of the opening / closing mechanism portion and the reset lever portion of the present invention during a reset operation, and FIG. 10 is a third state diagram showing the operating state of the opening / closing mechanism portion and the reset lever portion of the present invention during a reset operation.

[0188] The reset lever part (500) is configured to pressurize one side of the shooter (420) to provide restoring force to the shooter (420).

[0189] The reset lever part (500) is placed at the top of the housing corresponding to the shooter (420), that is, at the top of the housing (410) adjacent to the lever (320).

[0190] That is, the reset lever part (500) is placed between the shooter (420) and the lever (320).

[0191] The reset lever part (500) is configured to be moved toward the shooter (420) by being pressed by the rotating lever (320) during the reset operation, and the moved reset lever part (500) is configured to contact the shooter (420) and provide restoring force to the shooter (420) that returns to its initial state. (See FIGS. 8 to 10)

[0192] The shooter (420) part is formed of a plastic raw material and is stuck to the case or cover of the pressure trip device (400) due to high temperature arc pressure. The shooter (420) stuck to the case or cover of the pressure trip device (400) does not return during a reset operation, causing a reset failure of the circuit breaker (1).

[0193] The reset lever part (500) according to the present invention is a configuration created as a solution to the above-described reset failure, and applies pressure in the reset direction to the shooter (420) of the pressure trip device part (400) so that the reset operation can be performed smoothly even if the shooter (420) is attached to the case.

[0194] In addition, the reset lever part (500) is installed in the circuit breaker (1) while being fitted into a cross pin (600) that is installed through the arranged frame part (100).

[0195] Referring to FIGS. 6 and 7, the reset lever part (500) includes a body (510) having a certain area, a connecting hole (520) horizontally perforated through the body (510), and a second elastic member (530) horizontally arranged in the connecting hole (520) so as to be coupled to one side of the connecting hole (520).

[0196] The body (510) has a plate-like shape with a certain area.

[0197] Specifically, the body (510) is a plate-shaped body having a connecting hole (520) and a second elastic member (530) arranged thereon, a surface in contact with a lever (320) arranged on one side, and a surface for pressing a shooter (420) arranged on the other side.

[0198] Additionally, the body (510) includes a bottom surface that can be placed on top of the housing (410).

[0199] The lower surface of the body (510) may include a moving member (511b) that facilitates movement of the body.

[0200] The moving member (511b) reduces the frictional force on the bottom surface of the body (510) that moves horizontally on the top of the housing (410), thereby enabling the horizontal movement of the reset lever part (500) to be performed more smoothly.

[0201] Additionally, the moving member (511b) may have a longitudinal protrusion shape with a narrow width as shown in FIGS. 6 and 7.

[0202] Although not shown, the moving member (511b) may be applied without limitation to any other known member that facilitates movement of the body (510).

[0203] It may be desirable for the body (510) to be made of a material having a certain rigidity that is not damaged even when pressurized by the shooter (420) on one side and pressure is applied from the lever (320) on the other side.

[0204] As an example, the body (510) may be composed of a first body (511) having a connecting hole (520) therein and a second body (512) connected to the first body (511) and subjected to pressure from a lever (320).

[0205] The first body (511) is formed in a rectangular plate shape with a predetermined thickness, and a connecting hole (520) extending longitudinally is arranged on the inside.

[0206] The second body (512) is formed in the longitudinal direction to be connected to the upper end of the first body (511), and is configured to contact the lever (320) and receive the pressure of the lever (320).

[0207] The second body (512) includes a pressure step (5121) on one side of the upper portion corresponding to the lever (320).

[0208] The pressure step (5121) is configured to receive pressure from the lever (320).

[0209] Specifically, the pressure step (5121) is a step formed on the upper side of the second body (512) adjacent to the lever (320), and is a part that receives the pressure of the lever (320) by contacting the pressure projection (322a) of the lever (320).

[0210] Additionally, the pressure step (5121) is composed of a horizontal first surface (5121a) and a second surface (5121b) perpendicular to the first surface (5121a).

[0211] Referring to FIGS. 8 to 10, the pressure projection (322a) of the handle cam (322) pressurizes the reset lever part (500) by coming into contact with the second surface (5121b) and the first surface (5121a) of the pressure step (5121) when the lever (320) rotates, and in this process, the reset lever part (500) moves to the initial position.

[0212] Additionally, the second body (512) has a slope (5122) that is inclined at a certain angle on the side of the second body (512) corresponding to the shooter (420).

[0213] Accordingly, the second body (512) is configured to become wider as it goes downward where it comes into contact with the first body (511), thereby preventing the second body (512) under pressure from the lever (320) from breaking or being damaged, thereby improving the durability of the reset lever portion (500).

[0214] The connecting hole (520) is a horizontal hole formed on the inside of the body (510), through which a second elastic member (530) is received on one side and a cross pin (600) is positioned through the other side.

[0215] The second elastic member (530) is an elastic body that is horizontally placed in the connecting hole (520) so as to be coupled to one side of the connecting hole (520).

[0216] The second elastic member (530) has a horizontal length such that one side is in contact with one side of the cross pin (600) and one side can be joined to one side of the connecting hole (520).

[0217] That is, the second elastic member (530) is accommodated in the space of the connecting hole (520).

[0218] Additionally, the second elastic member (530) is provided in the form of a coil spring.

[0219] In addition, the second elastic member (530) can be applied without limitation to a known elastic member having the same effect as a coil spring.

[0220] That is, the second elastic member (530) can be provided in any shape that can store restoring force through compression and tension and provide restoring force stored in other members.

[0221] As an example, when the lever (320) is pressed against the body (510) of the reset lever portion (500) by rotation of the lever (320), the body (510) moves in the reset direction of the shooter (420), and the second elastic member (530) is compressed by the cross pin (600) supporting the other side of the second elastic member (530), thereby exhibiting a deformation shape.

[0222] At this time, the second elastic member (530) stores restoring force.

[0223] Meanwhile, when a trip motion is performed in which the shooter (420) moves due to the introduced gas pressure, the nail (310) of the opening / closing mechanism (300) rotates and the lever (320) is turned off, and the body (510) moves to the original position due to the restoring force of the stored second elastic member (530).

[0224] Additionally, the second elastic member (530) can be installed by inserting one side of the second elastic member (530) into a supporting protrusion (540) protruding from one side of the connecting hole (520).

[0225] The process of performing the trip operation and return (reset) operation of the wiring circuit breaker (1) according to one embodiment of the present invention described above is summarized as follows.

[0226] When tripping, fault current occurs → arc pressure flows into the pressure trip device (400) → shooter (PT shooter) (420) operates → nail (NAIL) (310) is released → lever (320) operates

[0227] In the case of a return (reset) operation, the lever (handle) (320, 321) reset operation → the push movement of the reset lever part (500) → the push movement of the shooter (420) → the push movement of the nail (310) → the reset operation (see FIGS. 8 to 10)

[0228] Accordingly, the reset lever part (500) according to the present invention has a simple configuration that is installed by being fitted into the cross pin (600), and is arranged adjacent to the lever (320) on one side and adjacent to the shooter (420) on the other side, thereby providing a restoring force to the shooter (420) that moves to the initial position by the pressure received from the lever (320), thereby enabling the reset operation of the pressure trip device part (400) to be performed smoothly even if a factor that causes a reset failure occurs.

[0229] The circuit breaker for wiring of the present invention has the advantage of preventing malfunction of a trip device and, further, improving the reliability of the trip device return operation.

[0230] In addition, the circuit breaker for wiring of the present invention includes a reset lever section that applies pressure in the reset direction to the shooter of the pressure trip device section, so that even in the event of a reset failure in which the shooter section, which is a plastic raw material, sticks to the case or cover of the pressure trip device due to high temperature arc pressure and does not return, a reset operation is performed.

[0231] In addition, the circuit breaker for wiring of the present invention has a simple and economical configuration and has the effect of efficiently performing a trip device recovery operation.

[0232] The circuit breaker (1) for wiring described above is not limited to the configuration and method of the embodiments described above, and the embodiments may be configured by selectively combining all or part of each embodiment so that various modifications can be made.

[0233] It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics thereof. Therefore, the above detailed description should not be construed in any way as limiting but rather as illustrative. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the scope of equivalents of the present invention are intended to be included within the scope of the present invention.

Claims

1. Frame section; A switching mechanism that contacts or separates a movable member located inside the frame portion from a stator; A pressure trip device having a shooter that provides a force for triggering the above-mentioned opening and closing mechanism, and operates the above-mentioned opening and closing mechanism to a trip position when an accident current occurs; and A circuit breaker for wiring, comprising a reset lever portion that contacts one side of the shooter and provides restoring force to the shooter.

2. In paragraph 1, The above opening and closing mechanism part is, A nail rotatably coupled to the above frame portion to perform a trip operation; and A circuit breaker for wiring, comprising a lever that rotates in a direction toward or against the nail.

3. In paragraph 1, The above pressure trip device part is, Housing having an inlet; A shooter installed longitudinally inside the housing so that a portion of the upper side is exposed to the outside, and moves in one direction by gas flowing into the housing; and A circuit breaker for wiring, comprising a first elastic member, one side of which is supported by the housing, and the other side of which is in contact with one side of the shooter to elastically support the shooter.

4. In paragraph 3, The above housing, It includes a gas path that is connected to the above inlet and through which the introduced gas flows, The above shooter, A wiring circuit breaker, the lower portion of which is accommodated within the gas passage.

5. In paragraph 2, The above reset lever part, A body having a certain area; A connecting hole formed horizontally in the above body; and Including a second elastic member horizontally arranged in the connecting hole so as to be coupled to one side of the connecting hole, The above connecting hole is, A wiring circuit breaker having a cross pin installed through the frame on the other side.

6. In paragraph 5, The above body, A first body having the above connecting hole; and A wiring circuit breaker comprising a second body formed longitudinally and connected to the upper end of the first body and subjected to pressure from the lever.

7. In paragraph 6, The above second body, A wiring circuit breaker comprising a pressure step formed on one side corresponding to the lever and in direct contact with the lever.

8. In paragraph 6, The above second body, A wiring circuit breaker, wherein the side of the second body corresponding to the shooter has a sloped surface inclined at a certain angle.

9. In paragraph 5, The above second elastic member is, A coil spring, wiring circuit breaker.

10. In paragraph 5, The above second elastic member is, A wiring circuit breaker having a horizontal length in which one side is connected to one side of the connecting hole and the other side is in contact with one side of the cross pin.

11. In paragraph 5, The reset lever part, A wiring circuit breaker, comprising a supporting projection protruding from one side of the above connecting hole and into which one side of the second elastic member is inserted and fixed.

12. In paragraph 2, The above lever, handle; A plate-shaped handle cam extending downward from the above handle; and It includes a handle coupling member that is inserted into the handle cam and performs the function of the central axis of the rotating handle, The above handle cam is, A wiring circuit breaker, comprising a pressure projection formed on one side corresponding to the reset lever portion and in direct contact with the reset lever portion.

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