Molded case circuit breaker

Abstract

The utility model relates to the technical field of circuit breakers, in particular to a molded case circuit breaker. The molded case circuit breaker comprises a base assembly, the base assembly comprises a plurality of base modules, and the plurality of base modules are respectively used for controlling connection / disconnection of a circuit in the molded case circuit breaker; the plurality of base modules are connected in series, and the plurality of base modules are detachably connected; any two of the plurality of base modules are used for being electrically connected with an external circuit. According to the molded case circuit breaker, the plurality of base modules connected in series are used for voltage division, so that the molded case circuit breaker can be suitable for a high-voltage environment, and the plurality of base modules are detachably connected, so that different numbers of base modules can be used according to different voltages, and the molded case circuit breaker can be suitable for environments with different voltages. In addition, due to the fact that the base modules are detachably connected, the base modules can be detached when faults occur, and the base modules can be maintained or replaced conveniently.

Description

Technical Field

[0001] This application relates to the technical field of circuit breakers, and particularly to a molded case circuit breaker. Background Art

[0002] In modern electrical systems, circuit breakers are key devices to ensure the safe operation of circuits. They are widely used in various fields such as industrial enterprises, commercial buildings, and households, and play an important role in cutting off the circuit in case of faults such as overload and short circuit to prevent damage to electrical equipment and serious accidents such as fires. With the development of the power system, the performance requirements for molded case circuit breakers are also increasing day by day. With the popularization of renewable energy and electric vehicles, the proportion of DC systems in the power system is rising, and the importance of DC circuit breakers is also increasing.

[0003] Currently, DC molded case circuit breakers determine whether there is an abnormal situation in the circuit by detecting the temperature or magnitude of the current in the conductor. When an abnormal situation is detected, the DC molded case circuit breaker will automatically cut off the circuit to prevent the occurrence of safety accidents. Existing DC molded case circuit breakers are usually connected to the circuit individually, and DC molded case circuit breakers with a voltage application range that matches the different voltages are required. When DC molded case circuit breakers are applied to high-voltage conditions, due to the higher voltage faced, the DC molded case circuit breakers are prone to electrical failures. To ensure the normal use of DC molded case circuit breakers, it is necessary to select better-performing insulating materials to manufacture DC molded case circuit breakers, thus increasing the manufacturing cost of DC molded case circuit breakers. Summary of the Utility Model

[0004] Based on this, it is necessary to provide a molded case circuit breaker with high versatility suitable for DC high-voltage conditions.

[0005] To solve the above technical problems, the present application provides the following technical solutions:

[0006] A molded case circuit breaker includes a base assembly. The base assembly includes a plurality of base modules, and the plurality of base modules are respectively used to control the connection / disconnection of the circuit inside the molded case circuit breaker; the plurality of base modules are connected in series, and moreover, the plurality of base modules are detachably connected;

[0007] Any two of the plurality of base modules are used for electrical connection with an external circuit.

[0008] It can be understood that the power on / off of the molded case circuit breaker is controlled by the series connection between multiple detachable base modules. On the one hand, multiple series-connected base modules can be used for voltage division, so that the molded case circuit breaker can be applied to high-voltage working conditions; on the other hand, different numbers of base modules can be selected for series connection according to different voltage requirements to adapt to different working conditions, which has the effect of expanding the applicable range of the molded case circuit breaker. Moreover, the faulty base module can be repaired or replaced individually, which plays a role in reducing the use cost.

[0009] In one embodiment, the multiple base modules are arranged side by side along a first direction, and any two adjacent base modules among the multiple base modules are in abutting limit;

[0010] Wherein, the first direction is the width direction of the base module.

[0011] It can be understood that by arranging the base modules side by side and making the adjacent base modules in abutting limit, the connection line between the two base modules can be shortened, so that the use cost of the connection line is lower.

[0012] In one embodiment, the base assembly further includes a connecting screw and a locking nut. The connecting screw penetrates through the multiple base modules along the first direction, and the part of the connecting screw passing through the multiple base modules is screwed with the locking nut for locking the multiple base modules.

[0013] It can be understood that by using the connecting screw and the locking nut to install the base assembly, the base assembly is detachably connected, and when a fault occurs, the base assembly can be disassembled and repaired.

[0014] In one embodiment, the base assembly further includes a positioning pin. The positioning pin penetrates through the multiple base modules, and the positioning pin is slidably matched with each base module respectively.

[0015] It can be understood that by arranging the positioning pin to penetrate through the multiple base modules, when assembling the multiple base modules with the connecting screw and the locking nut, the multiple base modules can be positioned first with the positioning pin, which is convenient for the subsequent assembly and fixation of the multiple base modules by the connecting screw and the locking nut.

[0016] In one embodiment, each base module includes two incoming and outgoing line connection plates;

[0017] Among two adjacent base modules, there are four incoming and outgoing line connection plates. The four incoming and outgoing line connection plates are combined in pairs to form two groups of incoming and outgoing line connection plate groups. Among them, two of the incoming and outgoing line connection plates in one group of incoming and outgoing line connection plate groups are connected by a connection row.

[0018] In one embodiment, the number of the base modules is configured to be three, and the three base modules are connected in series by two of the connection rows.

[0019] In one embodiment, the molded case circuit breaker further includes a connection row cover. The connection row cover is arranged corresponding to the connection row, and the connection row cover is arranged outside the corresponding connection row for covering the corresponding connection row.

[0020] Among them, the connection row cover is configured as an insulating part.

[0021] It can be understood that by providing the connection row cover and configuring the connection row cover as an insulating part, physical isolation of the connection row can be achieved, avoiding the connection row from being affected by the external environment.

[0022] In one embodiment, the base module includes a first base, a second base and an electrical component. An accommodation cavity is formed between the first base and the second base, and the electrical component is arranged in the accommodation cavity for controlling the connection / disconnection of the circuit in the base module.

[0023] Among them, the base module further includes a connection screw and a connection nut. The connection screw is arranged outside the accommodation cavity and penetrates through the first base and the second base, and the part of the connection screw passing through the first base and the second base is screwed with the connection nut for locking the first base and the second base.

[0024] In one embodiment, the molded case circuit breaker further includes an operating mechanism and a transmission mechanism. The operating mechanism is respectively in transmission connection with a plurality of the base modules through the transmission mechanism for simultaneously controlling the connection / disconnection of the circuits in the plurality of base modules.

[0025] It can be understood that by arranging an operating mechanism to drive the connection / disconnection of the circuits in a plurality of base modules, only one operating mechanism needs to be controlled to control the circuits in a plurality of base modules, which can simplify the operation steps.

[0026] In one embodiment, the molded case circuit breaker further includes an insulating middle cover and an insulating upper cover. The base assembly is installed in the insulating middle cover and covered with the insulating upper cover.

[0027] Among them, the operating mechanism includes a control handle, and the control handle penetrates through the insulating upper cover and is used to simultaneously control the connection / disconnection of the circuits in a plurality of the base modules.

[0028] It can be understood that by providing the insulating middle cover and the insulating upper cover, the interior is insulated from the external environment, preventing the internal circuit from being affected by the external environment. Therefore, the stable operation of the molded case circuit breaker can be ensured.

[0029] Compared with the prior art, by using the series connection between a plurality of detachable base modules to control the power on / off of the molded case circuit breaker, on the one hand, a plurality of series-connected base modules can be used for voltage division, so that the molded case circuit breaker can be applicable to the working conditions of high voltage; on the other hand, different numbers of base modules can be selected for series connection according to different voltage requirements to adapt to different working conditions, which has the effect of expanding the applicable range of the molded case circuit breaker, and the faulty base module can also be repaired or replaced individually, playing a role in reducing the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a schematic structural diagram of the molded case circuit breaker provided by the present application.

[0032] Figure 2 It is an exploded view of the molded case circuit breaker provided by the present application.

[0033] Figure 3 It is a base assembly diagram provided by the present application.

[0034] Figure 4 It is an exploded view of the base module provided by the present application.

[0035] Figure 5 It is a schematic diagram of the circuit connection structure of the molded case circuit breaker provided by the present application.

[0036] Figure 6 It is a schematic diagram of the structures of the operating mechanism and the transmission mechanism provided by the present application.

[0037] Figure 7 It is an exploded view of the operating mechanism and the transmission mechanism provided by the present application.

[0038] The reference numerals of each element are as follows:

[0039] 100, Molded Case Circuit Breaker; 10, Base Assembly; 11, Base Module; 111, Inlet and Outlet Connection Plate; 112, First Base; 113, Second Base; 114, Electrical Component; 1141, Contact; 11411, Moving Contact; 11412, Static Contact; 1142, Arc Extinguishing Component; 115, Accommodation Cavity; 116, Connecting Screw; 117, Connecting Nut; 12, Connection Bar; 13, Connecting Screw Rod; 14, Locking Nut; 15, Positioning Pin; 20, Connection Bar Cover; 30, Operating Mechanism; 31, Seat Body; 32, Control Handle; 33, Elastic Component; 34, Multi-link Component; 35, Driving Plate; 40, Transmission Mechanism; 41, Rotating Shaft Linkage Component; 42, Auxiliary Triggering Component; 43, First Rotating Shaft; 44, Second Rotating Shaft; 45, Rotating Component; 46, Protrusion; 47, Groove; 50, Insulating Middle Cover; 60, Insulating Upper Cover; 70, Sealing Component. Detailed Embodiment

[0040] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed embodiments of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0041] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the description of the present application are only for the purpose of illustration and do not represent the only implementation manner.

[0042] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0043] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0044] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the related listed items.

[0045] Please refer to Figures 1 to 7 , this application provides a plastic case circuit breaker 100, which is applied to DC high voltage conditions. The plastic case circuit breaker 100 includes a base assembly 10, and the base assembly 10 includes a plurality of base modules 11. The plurality of base modules 11 are respectively used to control the connection / disconnection of the circuits inside the plastic case circuit breaker 100; the plurality of base modules 11 are connected in series, and moreover, the plurality of base modules 11 are detachably connected; any two of the plurality of base modules 11 are used for electrical connection with an external circuit.

[0046] As can be seen from the above, by using the series connection between a plurality of detachable base modules 11 to control the power on / off of the plastic case circuit breaker 100, on the one hand, a plurality of series-connected base modules 11 can be used for voltage division, so that the plastic case circuit breaker 100 can be applicable to high voltage working conditions; on the other hand, different numbers of base modules 11 can be selected for series connection according to different voltage requirements to adapt to different working conditions, which has the effect of expanding the applicable range of the plastic case circuit breaker 100, and moreover, the faulty base module 11 can be repaired or replaced separately, which plays a role in reducing the use cost.

[0047] As Figures 1 to 3 shown, the plurality of base modules 11 are arranged side by side along the first direction x, and moreover, any two adjacent base modules 11 among the plurality of base modules 11 are in abutting limit; wherein, the first direction x is the width direction of the base module 11. It can be understood that since the plurality of base modules 11 are arranged side by side along the first direction x and any two adjacent base modules 11 are in abutting limit, the distance between the base modules 11 is closer, so that the circuit connection between the base modules 11 is more convenient.

[0048] In one embodiment, each of the base modules 11 includes two wire inlet / outlet connection plates 111; among two adjacent base modules 11, there are four wire inlet / outlet connection plates 111, and the four wire inlet / outlet connection plates 111 are combined in pairs to form two groups of wire inlet / outlet connection plate groups. Among them, two wire inlet / outlet connection plates 111 in one group of wire inlet / outlet connection plate groups are connected by a connection row 12. Here, the number of base modules 11 can be three, four, five, etc. There is a group of wire inlet / outlet connection plates 111 connected in series by a connection row 12 between adjacent base modules 11, and finally the circuits between the base modules 11 of the base assembly 10 are connected in series.

[0049] As Figure 5 shown, in this embodiment, the number of base modules 11 is configured to be three, and the three base modules 11 are connected in series by two connection rows 12. The connection row 12 is made of pure copper material.

[0050] As Figure 4 shown, the base module 11 includes a first base 112, a second base 113, and an electrical component 114. An accommodation cavity 115 is formed between the first base 112 and the second base 113, and the electrical component 114 is disposed in the accommodation cavity 115 and is used to control the connection / disconnection of the circuit in the base module 11; among them, the base module 11 further includes a connection screw 116 and a connection nut 117. The connection screw 116 is disposed outside the accommodation cavity 115 and penetrates through the first base 112 and the second base 113, and the part of the connection screw 116 passing through the first base 112 and the second base 113 is screwed with the connection nut 117 to lock the first base 112 and the second base 113.

[0051] Furthermore, the electrical component 114 includes a contact 1141 and an arc extinguishing member 1142. Among them, the contact 1141 includes a moving contact 11411 and a static contact 11412. The connection / disconnection of the circuit can be realized by the contact or separation of the moving contact 11411 and the static contact 11412. When the contact 1141 disconnects the circuit, an arc will be generated between the contacts 1141. An arc is a high-temperature and conductive gas discharge phenomenon. If it is not extinguished in time, problems such as burning of the contacts 1141 will occur. Therefore, by providing the arc extinguishing member 1142, the arc can be quickly extinguished after the contact 1141 breaks the circuit, ensuring the normal operation of the circuit breaker.

[0052] In one embodiment, the base assembly 10 further includes a connecting screw 13 and a locking nut 14, wherein the connecting screw 13 is arranged to penetrate the plurality of base modules 11 along the first direction x, and the portion of the connecting screw 13 passing through the plurality of base modules 11 is screwed to the locking nut 14 to lock the plurality of base modules 11. Here, the number of the connecting screw 13 and the locking nut 14 can be set to be multiple, such as 4, 5, 6, etc., and the connecting screw 13 and the locking nut 14 are arranged one by one.

[0053] In this embodiment, the number of the connecting screws 13 and the locking nuts 14 is both set to four.

[0054] In one embodiment, the base assembly 10 further includes a positioning pin 15, which is arranged through the plurality of base modules 11, and the positioning pin 15 is respectively slidably matched with each base module 11. By arranging the positioning pin 15 to penetrate the plurality of base modules 11, the base module 11 is first installed and positioned by the positioning pin 15 when it is installed, so that the assembly of the base assembly 10 is faster and the assembly efficiency of the base module 11 can be improved. Here, the number of the positioning pins 15 can be set to multiple, such as 2, 3, 4, etc.

[0055] In this embodiment, the number of the positioning pins 15 is set to two. The cost of the two positioning pins 15 is relatively low, and they can achieve a good positioning effect on the base module 11 .

[0056] like Figure 2 As shown, the molded case circuit breaker 100 further includes a connection row cover 20, which is arranged corresponding to the connection row 12, and the connection row cover 20 is arranged on the outer side of the corresponding connection row 12, and is used to cover the corresponding connection row 12; wherein the connection row cover 20 is configured as an insulating member. Here, the material of the connection row cover 20 can be configured as insulating plastic, ceramic material, etc.

[0057] like Figure 2 , Figure 6 and Figure 7 As shown, the molded case circuit breaker 100 further includes an operating mechanism 30 and a transmission mechanism 40 . The operating mechanism 30 is respectively connected to the plurality of base modules 11 through the transmission mechanism 40 , so as to simultaneously control the connection / disconnection of the circuits in the plurality of base modules 11 .

[0058] Specifically, please refer to Figure 6 and Figure 7, the operating mechanism 30 includes a base body 31, a control handle 32, an elastic member 33, a multi-link member 34, and a drive plate 35. The transmission mechanism 40 includes a rotating shaft linkage member 41, an auxiliary trigger member 42, a first rotating shaft 43, a second rotating shaft 44, and a rotating member 45. The control handle 32 can rotate relative to the base body 31. The multi-link member 34 is rotatably connected to the base body 31. One end of the elastic member 33 is connected to the control handle 32, and the other end is connected to the multi-link member 34. The base body 31 is rotatably connected to the axis of the rotating shaft linkage member 41 through the first rotating shaft 43. One end of the drive plate 35 is connected to the multi-link member 34, and the other end is rotatably connected to the rotating shaft linkage member 41 through the second rotating shaft 44. The connection position of the second rotating shaft 44 and the rotating shaft linkage member 41 is eccentrically arranged relative to the axis of the rotating shaft linkage member 41. At the same time, a protrusion 46 is provided at an eccentric position of the axis on one side surface of the rotating shaft linkage member 41, and a groove 47 with the same shape is provided at a position corresponding to the protrusion 46 on the rotating member 45. The protrusion 46 can cooperate with the groove 47. Combined with Figure 4 , the contact 1141 includes a moving contact 11411 and a static contact 11412. Among them, the static contact 11412 is fixed in the accommodating cavity 115, and the moving contact 11411 is movably arranged in the accommodating cavity 115 and fixed at an eccentric position of the axis of the rotating member 45. In this way, when the control handle 32 is operated to move relative to the base body 31, the multi-link member 34 is pulled through the elastic member 33, so that the multi-link member 34 rotates relative to the base body 31, and then drives the drive plate 35 to move. At this time, the drive plate 35 drives the rotating shaft linkage member 41 to rotate on the first rotating shaft 43. When the rotating shaft linkage member 41 rotates, the protrusion 46 cooperates with the groove 47, so as to drive the rotating member 45 to rotate; the moving contact 11411 also moves with the rotating member 45 and is connected or disconnected from the static contact 11412, so as to realize the connection or disconnection control of the circuit. At the same time, a protrusion 46 as described above is also provided on one side surface of the rotating member 45 away from the rotating shaft linkage member 41, and the protrusion 46 is also eccentrically arranged relative to the axis of the rotating member 45; correspondingly, a groove 47 corresponding to the protrusion 46 is also formed on the auxiliary trigger member 42, and the protrusion 46 and the groove 47 are correspondingly matched, so as to realize the auxiliary trigger member 42 to rotate following the rotating member 45, so as to realize the feedback of the circuit switch state.

[0059] Furthermore, a plurality of drive plates 35 are provided, and the plurality of drive plates 35 are synchronously rotated through the multi-link member 34 capable of synchronous movement. The plurality of drive plates 35 are connected to the plurality of rotating shaft linkage members 41, so as to drive the plurality of rotating shaft linkage members 41 to rotate through the plurality of drive plates 35, so as to realize the triggering of the plurality of base modules 11.

[0060] Specifically, please continue to refer to Figure 7, in this embodiment, two driving plates 35 are provided, two rotating shaft linkage members 41 are also provided, and three rotating members 45 are provided. One rotating shaft linkage member 41 is arranged between two adjacent rotating members 45, and each driving plate 35 drives one rotating shaft linkage member 41 to rotate.

[0061] Of course, the control handle 32 can also be directly connected to the multi-link member 34, so as to directly drive the multi-link member 34 to move, thereby driving the driving plate 35 to move.

[0062] Here, the multi-link member 34 can be a four-link, a five-link, etc. The elastic member 33 is provided as a spring or an elastic connecting block, etc.

[0063] As Figure 1 shown, the molded case circuit breaker 100 further includes an insulating middle cover 50 and an insulating upper cover 60. The base assembly 10 is installed in the insulating middle cover 50 and covered with the insulating upper cover 60; wherein, the control handle 32 penetrates through the insulating upper cover 60 and is used to simultaneously control the connection / disconnection of the circuits in multiple base modules 11.

[0064] As Figure 3 and Figure 4 shown, the molded case circuit breaker 100 further includes a seal 70. The molded case circuit breaker 100 realizes internal sealing through the seal 70. Here, the seal 70 is mainly used to seal the connection parts when the first base 112 and the second base 113 are connected by connecting screws 116 and connecting nuts 117, as well as the connection parts when the base assembly 10 is installed by connecting screws 13 and locking nuts 14 and the positioning parts of the positioning pins 15.

[0065] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as these combinations of technical features do not conflict, they should be considered as the scope described in this specification.

[0066] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A molded case circuit breaker, comprising a base assembly (10), the base assembly (10) comprising a plurality of base modules (11), the plurality of base modules (11) being respectively used to control the connection / disconnection of a circuit within the molded case circuit breaker (100); characterized in that: The plurality of base modules (11) are connected in series, and the plurality of base modules (11) are detachably connected; Any two of the base modules (11) among the plurality of base modules (11) are used to be electrically connected to an external circuit.

2. The molded case circuit breaker according to claim 1, characterized in that: The plurality of base modules (11) are arranged in parallel along a first direction, and any two adjacent base modules (11) among the plurality of base modules (11) are abutted to limit position; Wherein, the first direction is the width direction of the base module (11).

3. The molded case circuit breaker according to claim 2, characterized in that: The base assembly (10) further comprises a connecting screw (13) and a locking nut (14); the connecting screw (13) is arranged to penetrate the plurality of base modules (11) along the first direction, and the connecting screw (13) passes through the portion of the plurality of base modules (11) and is threadedly connected to the locking nut (14) for locking the plurality of base modules (11).

4. The molded case circuit breaker according to claim 2, characterized in that: The base assembly (10) further comprises a positioning pin (15), wherein the positioning pin (15) is arranged through the plurality of base modules (11), and the positioning pin (15) is respectively slidably matched with each base module (11).

5. The molded case circuit breaker according to claim 1, characterized in that: Each of the base modules (11) comprises two inlet and outlet connection plates (111); Two adjacent base modules (11) include four inlet and outlet connection plates (111), and the four inlet and outlet connection plates (111) are combined in pairs to form two inlet and outlet connection plate groups, wherein two inlet and outlet connection plates (111) in one inlet and outlet connection plate group are connected via a connection row (12).

6. The molded case circuit breaker according to claim 5, characterized in that: The number of the base modules (11) is configured to be three, and the three base modules (11) are connected in series via two connecting rows (12).

7. The molded case circuit breaker according to claim 5, characterized in that: The molded case circuit breaker (100) further comprises a connection row cover (20), the connection row cover (20) being arranged corresponding to the connection row (12), and the connection row cover (20) being arranged on the outside of the corresponding connection row (12) and used for covering the corresponding connection row (12); Wherein, the connecting row cover (20) is configured as an insulating part.

8. The molded case circuit breaker according to claim 1, characterized in that: The base module (11) comprises a first base (112), a second base (113) and an electrical component (114); a receiving cavity (115) is formed between the first base (112) and the second base (113); the electrical component (114) is arranged in the receiving cavity (115) and is used to control the connection / disconnection of a circuit in the base module (11); The base module (11) further comprises a connecting screw (116) and a connecting nut (117); the connecting screw (116) is arranged on the outside of the accommodating cavity (115) and passes through the first base (112) and the second base (113); and the connecting screw (116) passes through parts of the first base (112) and the second base (113) and is screwed to the connecting nut (117) for locking the first base (112) and the second base (113).

9. The molded case circuit breaker according to claim 1, characterized in that: The molded case circuit breaker (100) further comprises an operating mechanism (30) and a transmission mechanism (40); the operating mechanism (30) is respectively connected to the plurality of base modules (11) through the transmission mechanism (40) for simultaneously controlling the connection / disconnection of circuits within the plurality of base modules (11).

10. The molded case circuit breaker according to claim 9, characterized in that: The molded case circuit breaker (100) further comprises an insulating middle cover (50) and an insulating upper cover (60), wherein the base assembly (10) is installed in the insulating middle cover (50) and is covered by the insulating upper cover (60); The operating mechanism (30) comprises a control handle (32), and the control handle (32) is arranged through the insulating upper cover (60) and is used to simultaneously control the connection / disconnection of circuits in a plurality of the base modules (11).

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