Composite circuit breaker

Abstract

A composite circuit breaker is disclosed. A composite circuit breaker according to one aspect of the present invention comprises: a first blocking member electrically connected to either one of an external power source and a load; a second blocking member electrically connected to the other of the external power source and a load; a first busbar electrically connecting the first blocking member to either of the external power source and a load; a second busbar electrically connecting the second blocking member to the other of the external power source and a load; and a connecting busbar electrically connecting the first busbar and the second busbar, wherein an inductor may be electrically connected to at least one of the first busbar, the second busbar, and the connecting busbar to reduce the rate of increase in magnitude of the fault current.

Description

Technology Field

[0001] The present invention relates to a composite circuit breaker, and more specifically, to a composite circuit breaker having a structure capable of reducing the rate of increase of the fault current rise rate in various forms. Background Technology

[0002] A circuit breaker is a general term for a device that automatically cuts off the flow of current in an electrical circuit to prevent damage or fire that may occur due to overload or short circuits. Such devices are essential for maintaining the safety and stability of electrical systems.

[0003] Circuit breakers of a traditional structure are configured to allow an electrical connection between an external power source and a load through mechanical operation. Specifically, a traditional circuit breaker is composed of a fixed contact that is positioned in a fixed location and a movable contact that is movably provided relative to the fixed contact and contacts and separates from the fixed contact.

[0004] When the fixed contact comes into contact with the movable contact, the external power source and load can be electrically connected. Additionally, when the fixed contact is separated from the movable contact, the external power source and load can be electrically disconnected.

[0005] Meanwhile, recently, solid-state circuit breakers, which perform current interruption operations using semiconductor devices rather than traditional types of circuit breakers, can be utilized. Solid-state circuit breakers utilize power semiconductor devices such as MOSFETs and IGBTs, allowing them to interrupt or connect current more quickly than traditional types of circuit breakers.

[0006] However, semiconductor circuit breakers have high manufacturing costs and require additional circuitry for closing and closing operations, making it difficult to ensure high operational reliability compared to traditional circuit breakers when used independently.

[0007] Accordingly, composite circuit breakers that combine traditional circuit breakers and semiconductor circuit breakers are being utilized recently. Since composite circuit breakers can control the electrical connection between the external power source and the load through both mechanical and electrical methods, their reliability can be further enhanced.

[0008] On the other hand, semiconductor circuit breakers perform current interruption operations electrically. Therefore, if the generated fault current rises rapidly, there is a risk that the components of the semiconductor circuit breaker may be damaged, leading to a decrease in operational reliability.

[0009] Korean Registered Patent Document No. 10-2741915 discloses a bidirectional semiconductor circuit breaker for DC power distribution and a method of operating the same. Specifically, it discloses a bidirectional semiconductor circuit breaker for DC power distribution and a method of operating the same, wherein a voltage supplied through a coupled inductor is stored for backup purposes, and the DC power supply can be blocked by a first or second thyristor using the stored backup voltage.

[0010] However, the bidirectional semiconductor circuit breaker for DC distribution and the method of operating the same disclosed in the aforementioned prior art are limited to providing a method for equipping an inductor solely within the semiconductor circuit breaker itself. The aforementioned prior art fails to provide a method for achieving a specific effect by equipping an inductor not only in semiconductor circuit breakers but also in mechanical circuit breakers.

[0011] Korean Registered Patent Document No. 10-2761892 discloses a DC circuit breaker. Specifically, it discloses a DC circuit breaker comprising an inductor connected in series to a main current-carrying part and a mechanical switch connected to the inductor, and an auxiliary current-carrying part comprising a capacitor connected to the inductor and the mechanical switch.

[0012] However, the aforementioned prior art only provides methods for reducing fault current and capacitor withstand voltage during semiconductor switching operations. The aforementioned prior art also fails to provide a method for how to arrange inductors when mechanical circuit breakers are included in addition to semiconductor circuit breakers. Prior art literature

[0013] Korean Registered Patent Document No. 10-2741915 (December 9, 2024) Korean Registered Patent Document No. 10-2671892 (May 29, 2024) The problem to be solved

[0014] The present invention is intended to solve the problems described above, and the objective of the present invention is to provide a composite circuit breaker with a structure capable of interrupting current in various forms.

[0015] Another objective of the present invention is to provide a composite circuit breaker with a structure capable of forming a gradual rate of change in the magnitude of the fault current.

[0016] Another objective of the present invention is to provide a composite circuit breaker with a structure capable of smoothly shaping the rate of change in the magnitude of the fault current in various forms depending on the magnitude of the fault current.

[0017] Another objective of the present invention is to provide a composite circuit breaker of a structure capable of having various configurations for controlling the rate of change in magnitude of the fault current as needed.

[0018] Another objective of the present invention is to provide a composite circuit breaker with a structure capable of forming a gradual change rate in the magnitude of the fault current while maintaining the inherent function of the composite circuit breaker.

[0019] Another objective of the present invention is to provide a composite circuit breaker with a structure that can improve design freedom while achieving the above objective.

[0020] The problems of the present invention are not limited to those mentioned above, and other unmentioned problems will be clearly understood by a person skilled in the art to which the present invention pertains from the description below. means of solving the problem

[0021] According to one aspect of the present invention, a composite circuit breaker is provided, comprising: a first blocking member electrically connected to either one of an external power source and a load; a second blocking member electrically connected to the other of the external power source and a load; a first busbar electrically connecting the first blocking member to either of the external power source and a load; a second busbar electrically connecting the second blocking member to the other of the external power source and a load; and a connecting busbar electrically connecting the first busbar and the second busbar, wherein an inductor is electrically connected to at least one of the first busbar, the second busbar, and the connecting busbar to reduce the rate of increase in the magnitude of the fault current.

[0022] At this time, the first busbar comprises a first input busbar that electrically connects any one of the external power source and load and the first blocking unit; and a first output busbar that electrically connects the first blocking unit and the connecting busbar, and a composite circuit breaker may be provided in which the inductor is electrically connected to any one or more of the first input busbar and the second input busbar.

[0023] Additionally, a composite circuit breaker may be provided, comprising: a first input busbar that is electrically connected to either of the external power source and load and functions as a neutral line; a first N-phase input busbar that is electrically connected to either of the external power source and load and conducts current.

[0024] At this time, a composite circuit breaker may be provided, comprising a first inductor that is electrically connected by being coupled to either of the external power source and load and the first N-phase input busbar.

[0025] Additionally, a composite circuit breaker may be provided, wherein the connecting busbar comprises: a first connecting busbar electrically connected to the first output busbar to conduct current; and a second connecting busbar electrically connected to the first output busbar to function as a neutral line, and the first output busbar comprises: a first P-phase output busbar electrically connected to the first blocking unit and the first connecting busbar to conduct current; and a first N-phase output busbar electrically connected to the first blocking unit and the second connecting busbar to function as a neutral line.

[0026] At this time, a composite circuit breaker may be provided, wherein the inductor includes a second inductor that is electrically connected by being coupled to the first N-phase output busbar and the second connection busbar, respectively.

[0027] Additionally, a composite circuit breaker may be provided, wherein the connecting busbar comprises: a first connecting busbar electrically connected to the second busbar to conduct current; and a second connecting busbar electrically connected to the second busbar to function as a neutral line, and the second busbar comprises: a second N-phase busbar combined with the other of an external power source and a load and the first connecting busbar to function as a neutral line; and a second input busbar combined with the second blocking unit and the second connecting busbar to conduct current.

[0028] At this time, a composite circuit breaker may be provided, wherein the inductor includes a second inductor that is electrically connected by being coupled to the second input busbar and the second connection busbar, respectively.

[0029] Additionally, a composite circuit breaker may be provided, wherein the second busbar includes a second N-phase busbar that functions as a neutral line by being electrically connected to the other one of the external power sources and loads and the connecting busbar, and the inductor includes a third inductor that is electrically connected by being coupled to the other one of the external power sources and loads and the second N-phase busbar, respectively.

[0030] At this time, a composite circuit breaker may be provided in which the first busbar, the connecting busbar, and the second busbar are each provided in multiple quantities, current is conducted in any one of the multiple first busbars, any one of the multiple connecting busbars, and any one of the multiple second busbars, and another of the multiple first busbars, another of the multiple connecting busbars, and another of the multiple second busbars function as a neutral line, and the inductor is electrically connected by being coupled with any one or more of the other of the multiple first busbars, the other of the multiple connecting busbars, and the other of the multiple second busbars.

[0031] Additionally, a composite circuit breaker may be provided, comprising an inductor case that accommodates the inductor and is electrically connected to one or more of the first busbar, the second busbar, and the connecting busbar.

[0032] At this time, a composite circuit breaker may be provided, wherein the inductor case comprises: a case body surrounding the inductor; a receiving space surrounding the inner surface of the case body and accommodating the inductor; and a support member coupled to the inner surface of the case body, elastically supporting the inductor, and electrically connected to the inductor.

[0033] Additionally, a composite circuit breaker may be provided, wherein the inductor case is coupled to the outer surface of the case body and includes a case wire electrically connected to the support member.

[0034] At this time, the inductor may be configured to be connected in series with one or more of the first busbar, the second busbar, and the connecting busbar to control fluctuations in the current being conducted. Effects of the invention

[0035] According to the above configuration, the composite circuit breaker according to the embodiment of the present invention can interrupt current in various forms.

[0036] In addition, according to the above configuration, the composite circuit breaker according to the embodiment of the present invention can form a gradual rate of change in the magnitude of the fault current.

[0037] In addition, according to the above configuration, the composite circuit breaker according to the embodiment of the present invention can form a gradual change rate of the magnitude of the fault current in various forms depending on the magnitude of the fault current.

[0038] In addition, according to the above configuration, the composite circuit breaker according to the embodiment of the present invention may be provided with various configurations for controlling the rate of change in the magnitude of the fault current as needed.

[0039] In addition, according to the above configuration, the composite circuit breaker according to the embodiment of the present invention can form a gradual change rate in the magnitude of the fault current while maintaining the inherent function of the composite circuit breaker.

[0040] In addition, according to the above configuration, the composite circuit breaker according to the embodiment of the present invention can achieve the above objective while improving the degree of design freedom.

[0041] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention. Brief explanation of the drawing

[0042] FIG. 1 is a perspective view illustrating a composite circuit breaker according to an embodiment of the present invention. Figure 2 is a plan view illustrating the composite circuit breaker of Figure 1. FIG. 3 is a perspective view illustrating a first circuit breaker and a connecting busbar provided in the composite circuit breaker of FIG. 1. FIG. 4 is an exploded perspective view illustrating the first blocking section and the connecting busbar of FIG. 3. FIG. 5 is an exploded perspective view illustrating the first blocking section and the connecting busbar of FIG. 3. FIG. 6 is a plan view illustrating the first blocking section of FIG. 3. Figure 7 is a plan view illustrating the connecting busbar of Figure 3. FIG. 8 is a perspective view illustrating a second blocking member provided in the composite circuit breaker of FIG. 1. FIG. 9 is a plan view illustrating the second blocking section of FIG. 8. FIGS. 10 and FIGS. 11 are partially open perspective views illustrating the second blocking portion of FIG. 8. FIG. 12 is a plan view illustrating the second blocking section of FIG. 8. FIG. 13 is an AA perspective cross-sectional view illustrating the second blocking portion of FIG. 8. FIG. 14 is a perspective view illustrating the location where an inductor is coupled to the composite circuit breaker of FIG. 1. FIG. 15 is a plan view illustrating the location where an inductor is coupled to the composite circuit breaker of FIG. 14. FIG. 16 is an exploded perspective view illustrating the state in which an inductor is coupled to the composite circuit breaker of FIG. 14. FIG. 17 is a plan view illustrating the state in which an inductor is coupled to the composite circuit breaker of FIG. 16. FIG. 18 is a usage state diagram illustrating an inductor case provided in the composite circuit breaker of FIG. 1. FIG. 19 is a usage state diagram illustrating another embodiment of an inductor case provided in the composite circuit breaker of FIG. 1. Specific details for implementing the invention

[0043] Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the description in the drawings have been omitted, and the same reference numerals have been used throughout the specification for identical or similar components.

[0044] The words and terms used in this specification and claims are not limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention in accordance with the principles by which the inventor defines terms and concepts to best describe his invention.

[0045] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings correspond to preferred embodiments of the present invention and do not represent all technical ideas of the present invention; thus, various equivalents and modifications that may replace such configurations may exist at the time of filing the present invention.

[0046] In the following description, descriptions of some components may be omitted to clarify the features of the present invention.

[0047] In the following description, the term "connection" refers to one or more members being connected to each other in a manner that allows for fluid communication. In one embodiment, the connection may be formed by members such as a conduit, a pipe, or a piping system. In the following description, the term "connection" may be used interchangeably with the meaning that one or more members are "fluidly connected" to each other.

[0048] In the following description, the term "conduction" means that one or more components are connected to each other to transmit current or electrical signals. In one embodiment, the conduction may be formed in a wired form by a conductor member, etc., or in a wireless form such as Bluetooth, Wi-Fi, or RFID. In one embodiment, the conduction may include the meaning of "communication."

[0049] As used in the following description, the term "fluid" refers to any form of substance that flows due to an external force and whose shape or volume, etc., can be deformed. In one embodiment, the fluid may be a liquid such as water or a gas such as air.

[0050] As used in the following description, the term "fault current" refers to a current that differs from the current flowing under normal conditions in terms of magnitude, period, etc. The term "fault current" may be used to refer to a current that must be interrupted to prevent safety accidents or damage to components.

[0051] The terms "upper side," "lower side," "left side," "right side," "front side," and "rear side" used in the following description shall be understood by referring to the coordinate system depicted throughout the attached drawings.

[0052] Referring to FIGS. 1 to 5, a composite circuit breaker (10) according to an embodiment of the present invention is illustrated as an example. The composite circuit breaker (10) according to an embodiment of the present invention may be electrically connected to an external power source and a load, respectively. At this time, the composite circuit breaker (10) may allow or block the electrical connection between the external power source and the load.

[0053] The composite circuit breaker (10) can control the electrical connection between the external power source and the load in various forms. For example, the composite circuit breaker (10) can control the electrical connection between the external power source and the load in either a mechanical form or an electrical form. In the above embodiment, the composite circuit breaker (10) can control the electrical connection between the external power source and the load in both mechanical and electrical forms.

[0054] Accordingly, as can be seen from the name, the composite circuit breaker (10) may be configured to include both a mechanically operated component (i.e., the first circuit breaker (100) to be described later) and an electrically operated component (i.e., the second circuit breaker (200) to be described later).

[0055] Meanwhile, the composite circuit breaker (10) according to an embodiment of the present invention may include a configuration for reducing the rate of increase in magnitude, that is, the slope of the current relative to time, when a fault current occurs. As an example, the composite circuit breaker (10) may be configured to include an inductor (I). The inductor (I) can prevent a rapid increase in the magnitude of the fault current by storing a portion of the generated fault current as energy.

[0056] In addition, the inductor (I) can perform the role of reducing surge current in a specific frequency band.

[0057] That is, the inductor (I) has an impedance proportional to the frequency of the alternating current, which can be determined by the inductance value of the inductor (I) and the frequency of the alternating current. In other words, the impedance of the inductor (I) is proportional to the inductance value and the frequency of the alternating current.

[0058] At this time, the high-frequency component of the surge current can be suppressed by the high impedance of the inductor (I). Therefore, the inductor (I) connected in series with the composite circuit breaker (10) can limit the flow of surge current of a specific frequency, particularly a high frequency.

[0059] As a result, not only the components provided in the composite circuit breaker (10), but also the load electrically connected to the composite circuit breaker (10) can be protected.

[0060] At this time, the composite circuit breaker (10) according to an embodiment of the present invention may be equipped with inductors (I) at various locations depending on the magnitude of the fault current. In addition, a plurality of inductors (I) may be provided together at one or more locations.

[0061] Accordingly, the degree of freedom in the arrangement of the inductor (I) can be improved depending on the magnitude or nature of the generated fault current. Furthermore, a situation in which the magnitude of the fault current generated by each inductor (I) rises rapidly can be prevented.

[0062] As a result, the composite circuit breaker (10) is configured to interrupt fault current in various forms while gradually increasing the magnitude of the generated fault current.

[0063] A detailed description of the various arrangement structures of the inductor (I) will be provided later.

[0064] The composite circuit breaker (10) may include any configuration that is electrically connected to an external power source and a load, respectively, and can allow or block the electrical connection between them. In the illustrated embodiment, the composite circuit breaker (10) includes a first blocking section (100), a second blocking section (200), a first busbar (300), and a connecting busbar (400).

[0065] Additionally, referring further to FIGS. 10 through 13, the composite circuit breaker (10) according to the illustrated embodiment further includes a second busbar (500). Furthermore, referring further to FIGS. 18 through 19, the composite circuit breaker (10) according to the illustrated embodiment further includes an inductor case (600).

[0066] The first blocking section (100) constitutes a part of the outer shape of the composite circuit breaker (10). The first blocking section (100) is configured such that the composite circuit breaker (10) is connected to either an external power source or a load. The first blocking section (100) may be electrically connected to either an external power source or a load by means of a wire (not shown), etc.

[0067] The first blocking unit (100) can perform the role of physically blocking the fault current among the components of the composite circuit breaker (10). To this end, the first blocking unit (100) may be configured to include a circuit breaker (120) comprising a contact that is movably provided and a contact that is fixedly provided.

[0068] The first blocking unit (100) is electrically connected to the second blocking unit (200). Specifically, the first blocking unit (100) can be electrically connected to the second blocking unit (200) by a connecting bus bar (400).

[0069] The first blocking unit (100) can be electrically connected to the first busbar (300). The first blocking unit (100) can be electrically connected to either an external power source or a load via the first busbar (300). Additionally, the first blocking unit (100) can be electrically connected to the connecting busbar (400) via the first busbar (300).

[0070] The first blocking unit (100) can be electrically connected to the connecting busbar (400). As described above, the first blocking unit (100) can be electrically connected to the second blocking unit (200) and the second busbar (500) by the first busbar (300) and the connecting busbar (400).

[0071] The first blocking unit (100) may include any configuration for being electrically connected to either an external power source and a load, and to the second blocking unit (200) via a connecting busbar (400). In the illustrated embodiment, the first blocking unit (100) includes a first housing (110) and a circuit breaker (120).

[0072] The first housing (110) forms the outer shape of the first blocking part (100). A space is formed inside the first housing (110) so that other components of the first blocking part (100) can be accommodated. Additionally, the space of the first housing (110) may partially accommodate a first busbar (300) coupled with other components of the first blocking part (100) and a connecting busbar (400) coupled with the first busbar (300).

[0073] The first housing (110) can surround the other configuration of the first blocking part (100) from the outside. Accordingly, the other configuration of the first blocking part (100) housed inside the first housing (110), and the first busbar (300) and connecting busbar (400) coupled thereto, may not be exposed to the outside.

[0074] The first housing (110) may be formed of a high-rigidity yet electrically insulating material. This is to prevent accidental damage caused by external forces and to block accidental electrical current flow between the components housed inside the first housing (110) and the outside.

[0075] The space formed inside the first housing (110) may be partially connected to the outside. That is, as illustrated, a through hole is formed through the first housing (110) to allow the space to be connected to the outside. Accordingly, heat generated inside the first housing (110) can be released.

[0076] The first housing (110) may be of any shape capable of accommodating other components of the first blocking part (100) and the first busbar (300) and connecting busbar (400) combined therewith. In the illustrated embodiment, the first housing (110) is a three-dimensional shape having a length in the front-rear direction that is longer than the width in the left-right direction and a height in the up-down direction.

[0077] The circuit breaker (120) effectively performs the role of controlling the electrical connection state between the external power source and the load. The circuit breaker (120) can be connected directly or indirectly to the external power source and the load.

[0078] The circuit breaker (120) is coupled with the first housing (110). The circuit breaker (120) is accommodated in a space formed inside the first housing (110) and is not arbitrarily exposed to the outside.

[0079] The circuit breaker (120) is coupled with the first busbar (300). The circuit breaker (120) can be electrically connected to an external power source and load (specifically, through a connecting busbar (400) that is electrically connected to the second circuit breaker (200)) by the first busbar (300). The circuit breaker (120) is housed inside the first housing (110) together with the first busbar (300) and is not arbitrarily exposed to the outside.

[0080] The circuit breaker (120) may be provided in any form capable of controlling the electrical connection between an external power source and a load. In one embodiment, the circuit breaker (120) may be provided in the form of an air circuit breaker, a vacuum circuit breaker, or a DC relay.

[0081] A plurality of circuit breakers (120) may be provided. The plurality of circuit breakers (120) may be electrically separated from each other and each may be electrically connected to an external power source and load. In the illustrated embodiment, a pair of circuit breakers (120) is provided, including a first circuit breaker (121) and a second circuit breaker (122).

[0082] The first circuit breaker (121) is located on one side in the width direction of the first circuit breaker (100), on the left side in the illustrated embodiment. The first circuit breaker (121) can be coupled with the first N-phase input busbar (311) to function as a neutral line. Additionally, the first circuit breaker (121) can be coupled with the first P-phase output busbar (321) to output current.

[0083] The second circuit breaker (122) is located on the other side in the width direction of the first circuit breaker (100), to the right in the illustrated embodiment. The second circuit breaker (122) can be coupled with the first P-phase input busbar (312) to receive current. Additionally, the second circuit breaker (122) can be coupled with the first N-phase output busbar (322) to function as a neutral line.

[0084] The second blocking section (200) constitutes a different part of the exterior of the composite circuit breaker (10). The second blocking section (200) is configured such that the composite circuit breaker (10) is connected to one of the external power sources and loads. The second blocking section (200) may be electrically connected to the other of the external power sources and loads by means of a wire (not shown), etc.

[0085] The second blocking unit (200) can perform the role of electrically blocking the fault current among the components of the composite circuit breaker (10). To this end, the second blocking unit (200) may be configured to include a switchable configuration, namely a semiconductor device unit (230) to be described later.

[0086] The second blocking unit (200) is electrically connected to the first blocking unit (100). Specifically, the second blocking unit (200) can be electrically connected to the first blocking unit (100) by a connecting bus bar (400).

[0087] The second blocking unit (200) is electrically connected to the second busbar (500). Specifically, the second blocking unit (200) can be electrically connected to the connecting busbar (400) and another of the external power source and load by the second busbar (500).

[0088] The second blocking unit (200) may include any configuration for being electrically connected to the first blocking unit (100) via a connecting bus bar (400) with one of the external power sources and loads. In the embodiment illustrated in FIGS. 8 to 13, the second blocking unit (200) includes a second housing (210), a switch unit (220), a semiconductor device unit (230), a heat sink (240), and a fan member (250).

[0089] The second housing (210) forms the outer shape of the second blocking part (200). A space is formed inside the second housing (210) so that other components of the second blocking part (200) can be accommodated. Additionally, the second busbar (500) and the connecting busbar (400), which are combined with other components of the second blocking part (200), can be partially accommodated in the space of the second housing (210).

[0090] The second housing (210) can surround the other configuration of the second blocking part (200) from the outside. Accordingly, the other configuration of the second blocking part (200) housed inside the second housing (210), and the connecting busbar (400) and the second busbar (500) coupled thereto, may not be exposed to the outside.

[0091] The second housing (210) may be formed of a high-rigidity yet electrically insulating material. This is to prevent accidental damage caused by external forces and to block accidental electrical current flow between the components housed inside the second housing (210) and the outside.

[0092] The space formed inside the second housing (210) may be partially connected to the outside. That is, as illustrated, a through hole is formed through the second housing (210) to allow the space to be connected to the outside. Accordingly, heat generated inside the second housing (210) is released, thereby preventing thermal damage to other components of the second blocking part (200).

[0093] The second housing (210) may be of any shape capable of accommodating other components of the second blocking part (200) and the connecting busbar (400) and the second busbar (500) combined therewith. In the illustrated embodiment, the second housing (210) is a three-dimensional shape having a length in the front-rear direction that is longer than the length in the left-right direction and a height in the up-down direction.

[0094] The switch unit (220) is configured such that the second blocking unit (200) receives a control signal from the outside. The switch unit (220) is exposed to the outside of the second blocking unit (200) and can receive a control signal from an operator or any device. The switch unit (220) may be electrically connected to other components of the second blocking unit (200), for example, a semiconductor device unit (230) or a fan member (250).

[0095] The control signal input to the switch unit (220) can be transmitted to the semiconductor device unit (230) or the fan member (250) and used to drive them.

[0096] The switch unit (220) is coupled to the second housing (210). The switch unit (220) is located on one side in the height direction of the second housing (210), on the upper side in the illustrated embodiment. The switch unit (220) can be electrically connected to a semiconductor device unit (230) or a fan member (250) through a PCB (Printed Circuit Board) housed inside the second housing (210).

[0097] The switch unit (220) may be provided in any form capable of receiving a control signal from the outside. In the illustrated embodiment, the switch unit (220) may be provided in the form of a button that receives a control signal through a pressing operation. The switch unit (220) may be provided with a display for outputting the input control signal and the corresponding operating status.

[0098] The semiconductor device section (230) is configured such that the second blocking section (200) is combined with the second busbar (500) and electrically connected. The semiconductor device section (230) can be electrically connected to the other of the external power source and load, and to the connecting busbar (400) by the second busbar (500).

[0099] The semiconductor device part (230) is housed inside the second housing (210). The semiconductor device part (230) is surrounded by the second housing (210) and may not be arbitrarily exposed to the outside. At this time, heat generated from the semiconductor device part (230) is released to the outside through a through hole formed in the second housing (210), so that the semiconductor device part (230) can be cooled.

[0100] The semiconductor device part (230) is electrically connected to the switch part (220). A control signal applied to the switch part (220) is transmitted to the semiconductor device part (230) and can be used to control the semiconductor device part (230).

[0101] The semiconductor device portion (230) is positioned adjacent to the heat sink (240). In one embodiment, the semiconductor device portion (230) may be coupled in contact with the heat sink (240). In the above embodiment, heat generated from the semiconductor device portion (230) can be transferred to the heat sink (240) and rapidly released. In the illustrated embodiment, the lower side of the semiconductor device portion (230) is coupled to the upper side of the heat sink (240).

[0102] The semiconductor device part (230) is located adjacent to the fan member (250). Heat generated in the semiconductor device part (230) can be cooled by external air introduced by the fan member (250). In the illustrated embodiment, the semiconductor device part (230) is located on the front side of the fan member (250).

[0103] The semiconductor device part (230) may be provided in any form capable of performing the function of blocking current through a switching operation. In one embodiment, the semiconductor device part (230) may be provided as an electrical device including an IGBT or a MOSFET.

[0104] The semiconductor device portion (230) can be electrically connected to the second input bus bar (510) and the second output bus bar (520), respectively. As best illustrated in FIG. 13, the semiconductor device portion (230) can be electrically connected to the second input bus bar (510) and the second output bus bar (520), respectively, at different locations.

[0105] Since the process of the semiconductor device part (230) operating to allow or block electrical connection between an external power source and a load is a well-known technology, a detailed description will be omitted.

[0106] The heat sink (240) is configured to receive heat generated from the semiconductor device part (230) and release it to the outside. By the heat sink (240), the semiconductor device part (230) can be rapidly cooled so that thermal damage can be prevented.

[0107] The heat sink (240) is housed inside the second housing (210). The heat sink (240) is enclosed by the second housing (210) and is not arbitrarily exposed to the outside.

[0108] The heat sink (240) is coupled to the semiconductor device part (230). The heat sink (240) is located on one side in the height direction of the semiconductor device part (230), on the lower side in the illustrated embodiment. The heat sink (240) is in contact with the lower surface of the semiconductor device part (230) so as to receive heat generated from the semiconductor device part (230).

[0109] The heat sink (240) is positioned adjacent to the fan member (250). The heat transferred to the heat sink (240) can be cooled by the outside air introduced by the fan member (250).

[0110] The heat sink (240) may be provided in any form that is combined with the semiconductor device part (230) to receive heat and release the received heat to the outside. In the illustrated embodiment, the heat sink (240) has a length in the front-to-back direction, a height in the up-and-down direction, and a thickness in the left-to-right direction, and is configured to include a plurality of fins spaced apart in the left-to-right direction.

[0111] The heat sink (240) may be formed from a material with high thermal conductivity. This is to quickly receive heat generated from the semiconductor device part (230) and to release the received heat to the outside by the fan member (250). In one embodiment, the heat sink (240) may be formed from aluminum or an alloy material containing it.

[0112] The fan member (250) provides a transfer force for outside air to flow into the interior of the second housing (210). When the fan member (250) is operated, outside air outside the second housing (210) can flow into the interior to cool the semiconductor device part (230). Additionally, the incoming outside air can pass through the heat sink (240), absorb heat, and then flow out to the outside of the second housing (210).

[0113] The fan member (250) is located adjacent to the semiconductor device part (230) and the heat sink (240). The fan member (250) is located on one side in the longitudinal direction of the semiconductor device part (230) and the heat sink (240), on the rear side in the illustrated embodiment.

[0114] The fan member (250) is electrically connected to the switch unit (220). The fan member (250) can be operated in response to a control signal applied to the switch unit (220).

[0115] The fan member (250) operates in response to a control signal applied to the switch unit (220) and can be provided in any form capable of providing a transfer force to the outside air. In one embodiment, the fan member (250) can be provided in the form of a fan.

[0116] The first busbar (300) electrically connects the first blocking unit (100) to either of the external power source and load, and to the connecting busbar (400). The first busbar (300) is electrically connected to either of the external power source and load and to the connecting busbar (400), respectively.

[0117] The first busbar (300) is coupled with the first blocking unit (100). The first busbar (300) is accommodated in the internal space of the first housing (110) and is coupled with the blocker (120) to be electrically connected. Additionally, the first busbar (300) is coupled with the connecting busbar (400) and is electrically connected thereto.

[0118] The first busbar (300) may be provided in any form that can be electrically connected by being combined with different configurations. In one embodiment, the first busbar (300) may be provided as a bar-shaped busbar formed of an electrically conductive material.

[0119] In the embodiment illustrated in FIGS. 4 to 6, the first busbar (300) includes a first input busbar (310) and a first output busbar (320).

[0120] The first input busbar (310) is configured such that the first busbar (300) is electrically connected to either of the external power source and load. The first input busbar (310) is electrically connected to either of the external power source and load and to the circuit breaker (120), respectively. The first input busbar (310) is located on one side in the longitudinal direction of the composite circuit breaker (10), in the illustrated embodiment, on the front side.

[0121] The first input busbar (310) is housed inside the first housing (110). The first input busbar (310) is surrounded by the first housing (110) and may not be arbitrarily exposed to the outside.

[0122] Multiple first input busbars (310) may be provided. One of the multiple first input busbars (310) functions as a neutral line, and current may be input to the other. The multiple first input busbars (310) may be electrically connected by being coupled to each of the multiple circuit breakers (120).

[0123] At this time, a plurality of first input busbars (310) can be physically separated from a plurality of first output busbars (320) by blocking plates (not given a reference numeral) provided in a plurality of circuit breakers (120).

[0124] Accordingly, it will be understood that the electrical connection of the first input busbar (310) and the first output busbar (320) can be achieved only by the operation of the circuit breaker (120).

[0125] In the illustrated embodiment, the first input busbar (310) includes a first N-phase input busbar (311) and a first P-phase input busbar (312).

[0126] The first N-phase input busbar (311) is located on one side in the width direction of the composite circuit breaker (10), on the left side in the illustrated embodiment, and is electrically connected by being coupled with the first circuit breaker (121).

[0127] The first P-phase input busbar (312) is located on the other side in the width direction of the composite circuit breaker (10), on the right side in the illustrated embodiment, and is electrically connected by being coupled with the second circuit breaker (122).

[0128] Either one of the first N-phase input busbar (311) and the first P-phase input busbar (312) functions as a neutral line, and current can be transmitted to the other. In the illustrated embodiment, the first N-phase input busbar (311) functions as a neutral line, and current can be transmitted to the first P-phase input busbar (312).

[0129] In the above embodiment, a first inductor (I1), to be described later, is coupled and electrically connected to the first N-phase input busbar (311), so that the rate of increase of the fault current can be reduced. A detailed explanation thereof will be provided later.

[0130] The first output busbar (320) is configured such that the first busbar (300) is electrically connected to the connecting busbar (400). The first output busbar (320) is electrically connected to the circuit breaker (120) and the connecting busbar (400), respectively.

[0131] The first output busbar (320) is located on the other side in the longitudinal direction of the composite circuit breaker (10), on the rear side in the illustrated embodiment. The first output busbar (320) is located between the circuit breaker (120) and the connecting busbar (400).

[0132] The first output busbar (320) is housed inside the first housing (110). The first output busbar (320) is enclosed by the first housing (110) and may not be arbitrarily exposed to the outside.

[0133] Multiple first output busbars (320) may be provided. One of the multiple first output busbars (320) functions as a neutral line, and the other can output current. The multiple first output busbars (320) may be electrically connected by being coupled to each of the multiple circuit breakers (120) and connecting busbars (400).

[0134] In the illustrated embodiment, the first output busbar (320) includes a first P-phase output busbar (321) and a first N-phase output busbar (322).

[0135] The first P-phase output busbar (321) is located on one side in the width direction of the composite circuit breaker (10), on the left side in the illustrated embodiment, and is electrically connected by being coupled to the first circuit breaker (121) and the first connecting busbar (410), respectively.

[0136] The first N-phase output busbar (322) is located on the other side in the width direction of the composite circuit breaker (10), on the right side in the illustrated embodiment, and is electrically connected by being coupled to the second circuit breaker (122) and the second connecting busbar (420), respectively.

[0137] Either one of the first P-phase output busbar (321) and the first N-phase output busbar (322) functions as a neutral line, and the other can output current. In the illustrated embodiment, the first P-phase output busbar (321) outputs current, and the first N-phase output busbar (322) can be maintained as a neutral line.

[0138] Accordingly, it will be understood that the first connecting busbar (410) coupled with the first P-phase output busbar (321) receives current, and the second connecting busbar (420) coupled with the first N-phase output busbar (322) functions as a neutral line.

[0139] In the above embodiment, a second inductor (I2) is coupled and electrically connected between a part of the second connecting busbar (420), for example, the part where the second connecting busbar (420) and the first N-phase output busbar (322) are connected or the part where the second connecting busbar (420) and the second input busbar (510) are connected, so that the rate of increase of the fault current can be reduced. A detailed explanation thereof will be provided later.

[0140] The connecting busbar (400) is coupled to the first busbar (300) and the second busbar (500), respectively, to electrically connect them.

[0141] Specifically, the connecting busbar (400) is electrically connected to the first output busbar (320) to function as a neutral line or to receive current. Additionally, the connecting busbar (400) is electrically connected to the second input busbar (510) and the second N-phase busbar (530), respectively, to transmit the received current.

[0142] The connecting busbar (400) is located between the first blocking section (100) and the second blocking section (200). The connecting busbar (400) extends in the longitudinal direction of the composite blocker (10), and in the front-rear direction in the illustrated embodiment.

[0143] One end of the connecting busbar (400) in the longitudinal direction is received inside the first housing (110) and coupled to and electrically connected to the first output busbar (320). The other end of the connecting busbar (400) in the longitudinal direction is received inside the second housing (210) and coupled to and electrically connected to the second input busbar (510) and the second N-phase busbar (530), respectively.

[0144] The connecting busbar (400) may be provided in any form that can be electrically connected by being combined with each other different configurations. In one embodiment, the connecting busbar (400) may be provided as a bar-shaped busbar formed of an electrically conductive material.

[0145] In the embodiments illustrated in FIGS. 3 to 7, the connecting busbar (400) includes a first connecting busbar (410) and a second connecting busbar (420).

[0146] The first connecting busbar (410) is electrically connected to the first P-phase output busbar (321) and the second N-phase busbar (530), respectively. The first connecting busbar (410) can transmit the current provided from the first P-phase output busbar (321) to the second N-phase busbar (530). As described above, since the first P-phase output busbar (321) can output current, it can be said that the first connecting busbar (410) transmits current to the second N-phase busbar (530).

[0147] The second connecting busbar (420) is electrically connected to the first N-phase output busbar (322) and the second input busbar (510), respectively. The second connecting busbar (420) can transmit the current provided from the first N-phase output busbar (322) to the second input busbar (510). As described above, since the first N-phase output busbar (322) functions as a neutral line, it can be said that the second connecting busbar (420) also functions as a neutral line.

[0148] A second inductor (I2) may be coupled to either the first connecting busbar (410) or the second connecting busbar (420). In the illustrated embodiment, the second connecting busbar (420), which functions as a neutral line, may be coupled to the second inductor (I2) and electrically connected. Accordingly, the rate of increase of the fault current may be reduced. A detailed explanation thereof will be provided later.

[0149] The second busbar (500) electrically connects the second blocking unit (200) to the other of the external power source and load, and to the connecting busbar (400). The second busbar (500) is electrically connected to the other of the external power source and load and to the connecting busbar (400), respectively.

[0150] The second busbar (500) is coupled with the second blocking part (200). The second busbar (500) is accommodated in the internal space of the second housing (210) and is coupled with the semiconductor device part (230) to be electrically connected. Additionally, the second busbar (500) is coupled with the connecting busbar (400) and is electrically connected thereto.

[0151] The second busbar (500) may be provided in any form that can be electrically connected by being combined with different configurations. In one embodiment, the second busbar (500) may be provided as a bar-shaped busbar formed of an electrically conductive material.

[0152] In the embodiment illustrated in FIGS. 10 to 13, the second busbar (500) includes a second input busbar (510), a second output busbar (520), and a second N-phase busbar (530).

[0153] The second input busbar (510) is configured such that the second busbar (500) is combined with the semiconductor device part (230) and the connecting busbar (400) and electrically connected. The second input busbar (510) is electrically connected to any one of the plurality of connecting busbars (400). In the illustrated embodiment, the second input busbar (510) is located on one side in the longitudinal direction and one side in the width direction of the composite circuit breaker (10), that is, on the right side of the front.

[0154] The second input busbar (510) is combined with the second connection busbar (420) and electrically connected. As described above, the second connection busbar (420) can function as a neutral line. Accordingly, current is passed through the second input busbar (510), and a second inductor (I2), which will be described later, can be placed between the second connection busbar (420) and the second input busbar (510).

[0155] The second input busbar (510) is combined with the semiconductor device part (230) and electrically connected. The second input busbar (510) can be electrically connected to the second output busbar (520) by the semiconductor device part (230).

[0156] The second output busbar (520) is combined with the semiconductor device part (230) and electrically connected. The second output busbar (520) is exposed to the outside of the second blocking part (200) and can be electrically connected to one of the external power sources and loads. In the illustrated embodiment, the second output busbar (520) is exposed to the outside on the other side in the longitudinal direction of the composite blocking device (10), i.e., the rear side. The second output busbar (520) can extend between the semiconductor device part (230) and the fan member (250).

[0157] The second output busbar (520) can be electrically connected to the second input busbar (510) by the semiconductor device part (230). As described above, current is passed through the second output busbar (520), and thus current can also be passed through the second output busbar (520).

[0158] The second N-phase busbar (530) is another configuration in which the second busbar (500) is combined with another external power source and load and electrically connected to the connecting busbar (400). The second N-phase busbar (530) is electrically connected to another of the plurality of connecting busbars (400). In the illustrated embodiment, the second N-phase busbar (530) is located on one side in the longitudinal direction and the other side in the width direction of the composite circuit breaker (10), that is, on the front left side.

[0159] The second N-phase busbar (530) is combined with the first connecting busbar (410) and electrically connected. As described above, current can be passed through the first connecting busbar (410). Accordingly, the second N-phase busbar (530) functions as a neutral line and can be combined with the third inductor (I3). A detailed explanation of this will be provided later.

[0160] Referring to FIGS. 14 to 17, various embodiments are illustrated as examples in which an inductor (I) is provided in a composite circuit breaker (10) according to an embodiment of the present invention. The composite circuit breaker (10) according to an embodiment of the present invention may be electrically connected by combining an inductor (I) with a configuration in which current can be conducted, particularly a configuration that functions as a neutral line.

[0161] Therefore, even when a fault current occurs in the composite circuit breaker (10), the rate of increase in the magnitude of the fault current is reduced, so damage to each component of the composite circuit breaker (10) can be prevented. Furthermore, the occurrence of safety accidents caused by the occurrence of the fault current can also be prevented.

[0162] Additionally, one or more inductors (I) may be provided at multiple locations. Accordingly, the number and location of the inductors (I) can be changed to actively respond to the installation environment of the composite circuit breaker (10), such as the magnitude of the fault current.

[0163] Accordingly, the rate of increase in the magnitude of the fault current applied to the composite circuit breaker (10) is effectively reduced, so that damage to the composition of the composite circuit breaker (10) and the occurrence of safety accidents can be prevented.

[0164] At this time, the inductor (I) can be electrically connected by combining with the component that functions as the neutral wire among the components of the composite circuit breaker (10).

[0165] That is, as illustrated in FIGS. 14 to 17, the inductor (I) may be selectively placed at one or more of the following points: a point (A) where the first N-phase input busbar (311) and the first circuit breaker (121) are connected; another point (B) where the first N-phase output busbar (322) and the second connection busbar (420) are connected; and another point (C) where the second N-phase busbar (530) is connected to another external power source and load.

[0166] At this time, a first inductor (I1) may be placed at the above-mentioned point (A) and coupled and electrically connected to the first N-phase input busbar (311). Additionally, a second inductor (I2) may be placed at the above-mentioned other point (B) and coupled and electrically connected to the first N-phase output busbar (322) and the second connection busbar (420), respectively.

[0167] Furthermore, a third inductor (I3) is placed at the other point (C) and can be combined and electrically connected with the second N-phase busbar (530).

[0168] At this time, the first inductor (I1), the second inductor (I2), and the third inductor (I3) may be provided independently of each other. That is, at least one of the first inductor (I1), the second inductor (I2), and the third inductor (I3) may be provided and placed at the first point (A), the other point (B), and the yet another point (C), respectively.

[0169] Therefore, the number of inductors (I) placed can be changed depending on the required inductance size.

[0170] Additionally, the first to third inductors (I1, I2, I3) may be connected in series with one or more of the first busbar (300), the connecting busbar (400), and the second busbar (500) at the first point (A), the other point (B), and the other point (C). Each inductor (I1, I2, I3) may be configured to control fluctuations in the current flowing through each busbar (300, 400, 500).

[0171] Referring to FIGS. 18 and 19, an inductor case (600) provided in a composite circuit breaker (10) according to an embodiment of the present invention is illustrated as an example. The inductor case (600) accommodates and supports an inductor (I) and can be electrically connected by being combined with other components of the composite circuit breaker (10).

[0172] At this time, the inductor case (600) can accommodate inductors (I) having various sizes or various inductances. Accordingly, inductors (I) having different sizes depending on the required inductance can be accommodated in the same inductor case (600) and electrically connected to other components of the composite circuit breaker (10).

[0173] Specifically, the inductor (I) housed in the inductor case (600) shown in FIG. 18 (a) can be formed to be larger than the inductor (I) housed in the inductor case (600) shown in FIG. 18 (b).

[0174] Additionally, as illustrated in FIG. 19, the inductor case (600) can simultaneously accommodate multiple inductors (I) having different sizes or different inductances. To this end, the inductor case (600) may be configured to include various configurations for supporting inductors (I) of different sizes.

[0175] In the illustrated embodiment, the inductor case (600) includes a case body (610), a receiving space (620), a support member (630), and a case wire (640).

[0176] The case body (610) forms the outer shape of the inductor case (600). A receiving space (620) is formed inside the case body (610) to accommodate an inductor (I). A support member (630) is attached to a part of the inner surface of the case body (610), that is, the surface surrounding the receiving space (620), to support the inductor (I).

[0177] The case body (610) is coupled with the case wire (640). An inductor (I) housed in the case body (610) and supported by a support member (630) can be electrically connected to other components of the composite circuit breaker (10) by the case wire (640).

[0178] The case body (610) may be of any shape capable of accommodating and supporting the inductor (I). In the illustrated embodiment, the case body (610) is a polygonal prism shape having a rectangular cross-section and a length in the front-rear direction.

[0179] In the above embodiment, each side in the longitudinal direction of the case body (610), the upper and lower sides in the illustrated embodiment, can be connected to a case wire (640). The case wire (640) can be electrically connected to a support member (630) located on the inner surface of the case body (610).

[0180] The receiving space (620) is a space formed inside the case body (610). The receiving space (620) is defined by being enclosed within the inner surface of the case body (610). The receiving space (620) can accommodate an inductor (I).

[0181] A support member (630) is positioned in the receiving space (620). The support member (630) can be attached to the inner surfaces of the case body (610) surrounding the receiving space (620) along the longitudinal direction, specifically the front and rear inner surfaces in the illustrated embodiment.

[0182] The receiving space (620) may have a shape corresponding to the shape of the case body (610) or the inductor (I). In the illustrated embodiment, the receiving space (620) is formed as a polygonal prism-shaped space having a rectangular cross-section and a length in the front-rear direction.

[0183] The support member (630) elastically supports the inductor (I) housed in the receiving space (620). Accordingly, inductors (I) of various sizes can be housed and supported in the receiving space (620). At this time, the support member (630) can be electrically connected to the inductor (I). Additionally, the support member (630) is electrically connected by being coupled with the case wire (640).

[0184] Accordingly, the inductor (I) combined with the inductor case (600) can be electrically connected to other components of the composite circuit breaker (10) through the support member (630) and the case wire (640).

[0185] The support member (630) may have any shape capable of elastically supporting the inductor (I). In one embodiment, the support member (630) is provided in the form of a coil spring to elastically support each end of the inductor (I) in the longitudinal direction.

[0186] In the illustrated embodiment, a pair of support members (630) are provided to support only the longitudinal direction of the inductor (I), i.e., the front and rear sides. Alternatively, a pair of additional support members (630) may be provided to additionally support the width direction of the inductor (I), i.e., the left and right sides.

[0187] The case wire (640) electrically connects the inductor (I) housed in the housing space (620) to other components of the composite circuit breaker (10). The case wire (640) is connected to each side along the longitudinal direction of the case body (610), the front side and the rear side in the illustrated embodiment, respectively. The case wire (640) is electrically connected to each of a pair of support members (630) that support the inductor (I) along the longitudinal direction.

[0188] In the embodiment illustrated in FIG. 18, the inductor case (600) may be configured to accommodate a number of inductors (I). In the above embodiment, it may be said that the number of inductors (I) are connected in series with other components of the composite circuit breaker (10).

[0189] In the embodiment illustrated in FIG. 19, the inductor case (600) may be configured to accommodate a plurality of inductors (I) spaced apart in the width direction. In the above embodiment, a plurality of inductors (I) connected in parallel with each other may be connected in series with other components of the composite circuit breaker (10).

[0190] Accordingly, the composite circuit breaker (10) according to an embodiment of the present invention can freely adjust the size, inductance, number of inductors (I), and arrangement method of the inductors (I) as needed.

[0191] Although embodiments of the present invention have been described, the spirit of the present invention is not limited to the embodiments presented in this specification. Those skilled in the art who understand the spirit of the present invention may easily propose other embodiments within the scope of the same spirit by adding, changing, deleting, or adding components, and such embodiments shall also be considered to fall within the scope of the spirit of the present invention. Explanation of the symbols

[0192] 10: Composite circuit breaker 100: First blocking section 110: 1st Housing 120: Circuit breaker 121: First circuit breaker 122: Second circuit breaker 200: Second blocking section 210: 2nd Housing 220: Switch section 230: Semiconductor Device Division 240: Heatsink 250: No fan 300: 1st busbar 310: 1st input busbar 311: 1st N-phase input busbar 312: 1st P-phase input busbar 320: 1st output busbar 321: 1st P-phase output busbar 322: 1st N-phase output busbar 400: Connect busbar 410: 1st connecting busbar 420: Second connecting busbar 500: 2nd busbar 510: Second input busbar 520: Second output busbar 530: 2nd N-phase busbar 600: Inductor case 610: Case body 620: Accommodation space 630: Lack of support 640: Case wire I: Inductor I1: First inductor I2: Second inductor I3: Third inductor

Claims

Claim 1 A composite circuit breaker comprising: a first blocking section electrically connected to either one of an external power source and a load; a second blocking section electrically connected to the other of the external power source and a load; a first busbar electrically connecting the first blocking section to either of the external power source and a load; a second busbar electrically connecting the second blocking section to the other of the external power source and a load; and a connecting busbar electrically connecting the first busbar and the second busbar, wherein an inductor is electrically connected to at least one of the first busbar, the second busbar, and the connecting busbar to reduce the rate of increase in the magnitude of the fault current. Claim 2 A composite circuit breaker according to claim 1, wherein the first busbar comprises: a first input busbar that electrically connects any one of the external power source and load and the first blocking part; and a first output busbar that electrically connects the first blocking part and the connecting busbar, and the inductor is electrically connected to any one or more of the first input busbar and the second input busbar. Claim 3 A composite circuit breaker according to paragraph 2, wherein the first input busbar comprises: a first N-phase input busbar electrically connected to either of the external power source and load and functioning as a neutral line; and a first P-phase input busbar electrically connected to either of the external power source and load and through which current is conducted. Claim 4 In paragraph 3, the composite circuit breaker comprises a first inductor that is electrically connected to either of the external power source and load and the first N-phase input busbar. Claim 5 A composite circuit breaker according to claim 2, wherein the connecting busbar comprises: a first connecting busbar electrically connected to the first output busbar to conduct current; and a second connecting busbar electrically connected to the first output busbar to function as a neutral line, and the first output busbar comprises: a first P-phase output busbar electrically connected to the first blocking unit and the first connecting busbar to conduct current; and a first N-phase output busbar electrically connected to the first blocking unit and the second connecting busbar to function as a neutral line. Claim 6 In claim 5, the composite circuit breaker comprises a second inductor that is electrically connected to and coupled to the first N-phase output busbar and the second connection busbar, respectively. Claim 7 A composite circuit breaker according to paragraph 2, wherein the connecting busbar comprises: a first connecting busbar electrically connected to the second busbar to conduct current; and a second connecting busbar electrically connected to the second busbar to function as a neutral line, and the second busbar comprises: a second N-phase busbar combined with the other of an external power source and a load and the first connecting busbar to function as a neutral line; and a second input busbar combined with the second blocking unit and the second connecting busbar to conduct current. Claim 8 In claim 7, the composite circuit breaker comprises a second inductor that is electrically connected to and coupled to the second input busbar and the second connection busbar, respectively. Claim 9 A composite circuit breaker according to claim 1, wherein the second busbar includes a second N-phase busbar that functions as a neutral line by being electrically connected to the other one of the external power source and load and the connecting busbar, and the inductor includes a third inductor that is electrically connected by being coupled to the other one of the external power source and load and the second N-phase busbar, respectively. Claim 10 A composite circuit breaker according to claim 1, wherein the first busbar, the connecting busbar, and the second busbar are each provided in multiple quantities, current is conducted in any one of the multiple first busbars, any one of the multiple connecting busbars, and any one of the multiple second busbars, and another of the multiple first busbars, another of the multiple connecting busbars, and another of the multiple second busbars function as a neutral line, and the inductor is electrically connected by being coupled with at least one of the other of the multiple first busbars, another of the multiple connecting busbars, and another of the multiple second busbars. Claim 11 A composite circuit breaker according to claim 1, comprising an inductor case that accommodates the inductor and is electrically connected to one or more of the first busbar, the second busbar, and the connecting busbar. Claim 12 A composite circuit breaker according to claim 11, wherein the inductor case comprises: a case body surrounding the inductor; a receiving space surrounding the inner surface of the case body and accommodating the inductor; and a support member coupled to the inner surface of the case body, elastically supporting the inductor and electrically connected to the inductor. Claim 13 A composite circuit breaker according to claim 12, wherein the inductor case comprises a case wire that is coupled to the outer surface of the case body and electrically connected to the support member. Claim 14 A composite circuit breaker according to claim 1, wherein the inductor is connected in series with one or more of the first busbar, the second busbar, and the connecting busbar to control fluctuations in the current being conducted.

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