Molded case circuit breaker

Abstract

The utility model relates to a molded case circuit breaker, which comprises a plurality of electrical connection installation parts and a plurality of electrical connection installation parts, a plurality of conductive static contact busbars (250), a plurality of conductive L-shaped busbars (240), a hollow nut (261) and a bottom plug (100). The upper support plate (110) and the lower support plate (130) of the bottom plug can be respectively connected to the corresponding first support plate receiving part and the corresponding second support plate receiving part located at the top of the base and / or the bottom of the base, and can be locked with the longitudinal first card groove and the longitudinal second card groove located at the top of the base and / or the bottom of the base by means of the first stopper (131) and the second stopper (132) of the bottom plug, so as to close the electrical connection installation part and / or the electrical connection installation part.

Description

Technical Field

[0001] The utility model relates to a molded case circuit breaker. The molded case circuit breaker is particularly provided with an insulating bottom plug, which can increase the electrical gap and creepage distance compared with the prior art. Background Art

[0002] Molded-Case Circuit Breaker (MCCB) usually has a larger rated current, breaking capacity and pollution level. In addition, with the development of technology, some molded-case circuit breakers now have digital and intelligent designs, and have integrated releases inside to adjust the tripping characteristics.

[0003] As a technical solution for molded case circuit breakers, announcement number CN 216671 525 U discloses an IoT carrier topology molded case circuit breaker, which aims to solve the problem that the existing molded case circuit breakers need to use a locking mechanism to press and fix the wires when installing or removing the wires, the operation steps are relatively cumbersome, and the locking mechanism is likely to be damaged during the disassembly process. The wires are mainly connected and fixed by the first wiring terminal and the second wiring terminal on the first fixing block and the second fixing block respectively arranged at the top and the bottom of the circuit breaker, and the upper ends of the first wiring terminal and the second wiring terminal are provided with regular hexagonal slots, the lower ends of the first wiring terminal and the second wiring terminal are provided with circular holes, and the first fixing block and the second fixing block are provided with arc-shaped notches, which facilitates the plugging and fixing of one end of the wire through the connecting terminal and the installation of the wire. However, this type of molded case circuit breaker only takes into account the convenience of wiring at both ends, but does not provide corresponding protection for the electrical connection parts of each terminal at both ends, that is, it does not consider how to increase the shortest distance between two conductive parts (wiring terminals) along the insulating surface - creepage distance, and the insulation distance between two conductive parts in the air - electrical clearance. And since a considerable number of molded case circuit breakers will be used outdoors in environments polluted by wind, sand or rain, their tolerance under pollution levels must be controlled. Furthermore, since instantaneous overvoltage or repetitive peak voltage will occur between the adjacent energized terminals of the circuit breaker, it will also bring certain risks to the use of the molded case circuit breaker. Therefore, special consideration should be given to the protection of the terminals used for electrical connection at both ends of the molded case circuit breaker.

[0004] In order to further improve the above-mentioned technical defects, announcement number CN 219370928 U describes a mounting base suitable for a circuit breaker and an end cover adapted thereto. The mounting base is hexagonal, and two rows of wiring holes are respectively arranged at the upper and lower ends of the upper surface of the mounting base; each row of wiring holes has at least three; screw holes are arranged between each row of wiring holes; the end cover covers the mounting base; the contact is arranged in the middle of the end cover and exposed outside the end cover; grooves are arranged at the upper and lower ends of the end cover; the position of the groove is the same as the position of the wiring hole; screw holes are arranged on the end cover, and the position corresponds to the screw holes on the mounting base. Obviously, the utility model has considered using the end cover to cover the mounting base of the circuit breaker, that is, to protect the power connection part of the circuit breaker, so as to enable the circuit breaker to be used safely and stably. However, because the end cover is connected to the mounting base by multiple screws, the three mounting bases located at the top and bottom of the circuit breaker are each combined with the three end covers by screws. Then, once the protective measures are incomplete, under the influence of pollution or external environment, a shorter electrical gap may be formed between the wiring hole and the mounting screw, and between the wiring hole and other conductive parts in close proximity. When the overvoltage value between the electrical gaps exceeds a certain critical value, this voltage will quickly cause electrical breakdown, making it impossible to ensure the stable operation of the circuit breaker. Furthermore, this method of threading the end cover and the mounting base also requires repeated disassembly, which is complicated and requires not only the rearrangement and processing of the circuit breaker base, but also the repeated installation of the end cover brings a lot of inconvenience to the user. Utility Model Content

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the above-mentioned prior art that the external connection parts of the molded case circuit breaker are not effectively protected, and the shortest distance between the two conductive parts (connection terminals) along the insulating surface is reduced when the base of the circuit breaker is installed with metal fasteners. In a simple and feasible way, a molded case circuit breaker with a bottom plug is provided to achieve effective protection and stable operation of the molded case circuit breaker.

[0006] In order to solve the above technical problems, the utility model provides a molded case circuit breaker, which has a housing including at least a circuit breaker mask, a circuit breaker upper cavity and a circuit breaker base, wherein at least the contact arc extinguishing module, the tripping component and the mechanical control module or the intelligent control module of the molded case circuit breaker are accommodated. It also includes:

[0007] A plurality of electrical input installation positions and a plurality of electrical output installation positions; a plurality of conductive stationary contact busbars, one end of which is configured to be electrically connected or disconnected with the moving contact of the molded case circuit breaker, and the other end of which is suitable for electrical input connection with the electrical input installation position; a plurality of conductive L-shaped busbars, which are configured to be suitable for electrical output connection of the molded case circuit breaker at the electrical output installation position; a hollow nut, which is configured to have an end portion that can be used for electrical input connection with the stationary contact busbar and can be used for electrical output connection with the L-shaped busbar.

[0008] According to the utility model, the molded case circuit breaker further comprises a bottom plug, which is configured to accommodate the main body of the hollow nut, and can enter the corresponding transverse slots located at the top of the base and / or the bottom of the base respectively along the longitudinal width direction X of the circuit breaker base by means of the first and second recesses opposed thereto. The bottom plug also comprises a bottom plug upper support plate and a bottom plug lower support plate, which can be respectively engaged with the corresponding first support plate receiving portion and the corresponding second support plate receiving portion located at the top of the base and / or the bottom of the base, and can be respectively locked with the longitudinal first slot and the longitudinal second slot located at the top of the base and / or the bottom of the base by means of the first stopper of the bottom plug and the second stopper of the bottom plug, so as to close the electrical input installation part and / or the electrical output installation part.

[0009] In a non-limiting embodiment of the molded case circuit breaker according to the present invention, a plurality of electrical input installation portions are evenly distributed along the longitudinal width direction X at the top of the base of the circuit breaker base; and a plurality of electrical output installation portions are evenly distributed along the longitudinal width direction X at the bottom of the base of the circuit breaker base.

[0010] In a non-limiting embodiment of the molded case circuit breaker according to the present invention, the plurality of conductive static contact busbars are designed to be vertically arranged along the longitudinal height direction Z between the upper cavity of the circuit breaker and the circuit breaker base, and adjacent to the plurality of electrical connection installation positions on the top of the base; and the plurality of conductive L-shaped busbars are designed to be arranged along the longitudinal height direction Z near the plurality of electrical connection installation positions at the bottom of the base of the molded case circuit breaker.

[0011] In a non-limiting embodiment of the molded case circuit breaker according to the present invention, the static contact busbar is roughly in a "J"-shaped one-piece configuration, and has a static contact connecting portion, a static contact fixing portion and a static contact piece for electrical connection and disconnection, wherein the static contact piece is located at the hook portion of the static contact busbar, and the static contact connecting portion opposite to the static contact piece is symmetrically arranged with at least one pair of electrical access mounting holes along its transverse direction.

[0012] In a non-limiting embodiment of the molded case circuit breaker according to the present invention, the L-shaped busbar is generally of L-shaped one-piece configuration, and has an L-shaped busbar fixing portion and an L-shaped busbar connecting portion that are perpendicular to each other, wherein at least one pair of electrical connection mounting holes are symmetrically arranged along the longitudinal width direction X in the L-shaped busbar connecting portion.

[0013] In a non-limiting embodiment of the molded case circuit breaker according to the present invention, the hollow nut has at least a nut cover and a hexagonal nut body, so that the external busbar is electrically connected to the static contact busbar by means of a fastening connection and the external busbar is electrically connected to the L-shaped busbar.

[0014] In a non-limiting embodiment of the molded case circuit breaker according to the present invention, the bottom plug is generally in a stepped configuration, and an integrally constructed bottom plug upper support plate, a bottom plug body and a bottom plug lower support plate are arranged in sequence along its longitudinal height direction, as well as a pair of nut holes in the shape of blind holes formed between the bottom plug upper support plate and the bottom plug lower support plate; and the bottom plug upper support plate, the bottom plug body and the bottom plug lower support plate extend along the longitudinal width direction of the bottom plug to the bottom plug back plate.

[0015] Furthermore, the bottom plug back plate is respectively constructed with bottom plug back plate thrust surfaces on both longitudinal sides adjacent to the bottom plug body for limiting the bottom plug back plate at the corresponding electrical input installation position and / or the corresponding electrical output installation position.

[0016] Furthermore, the first locking portion and the second locking portion of the bottom plug are constructed to have locking fingers extending toward the longitudinal outer side of the lower support plate of the bottom plug, and are connected with the corresponding clamping parts of the molded case circuit breaker to facilitate installation and disassembly by operators.

[0017] Specifically, the bottom plug is made of insulating material to provide insulation protection for the electrical input and output parts of the molded case circuit breaker.

[0018] In summary, the utility model overcomes the defects of the aforementioned prior art, and constructs a standardized structure of the external electrical connection part of the molded case circuit breaker and an insulating bottom plug adapted thereto through a modular design, thereby achieving effective protection and stable operation of the molded case circuit breaker in a simple, feasible and pluggable manner, and avoiding the use of conventional metal connectors, thereby increasing the electrical clearance and creepage distance.

[0019] For the convenience of discussion, the automatic sensing pencil sharpener described in the present application will be discussed with reference to the reference numerals indicated in the accompanying drawings. However, unless otherwise explicitly indicated, the drawings and detailed description should not be considered to limit the scope of the claims, and the utility model disclosed herein can also be implemented with various modifications or improvements as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings herein are incorporated in and constitute a part of the specification, and illustrate embodiments consistent with the present utility model. They are merely exemplary and explanatory and do not limit the present utility model.

[0021] Figure 1 A three-dimensional perspective view of a non-limiting embodiment of a bottom plug according to the present invention is shown;

[0022] Figure 2 A three-dimensional perspective view of a non-limiting embodiment of a bottom plug according to the present invention is shown from another perspective;

[0023] Figure 3 The invention shows a housing structure of a molded case circuit breaker and components connected thereto for electrical connection and connection, and in particular shows a three-dimensional view of a bottom plug for increasing electrical clearance and creepage distance and facilitating manufacture and installation;

[0024] Figure 4 From another perspective, the housing structure of the molded case circuit breaker according to the present invention and the components connected thereto for electrical connection and connection are shown, in particular, a three-dimensional view of a bottom plug for increasing electrical clearance and creepage distance and facilitating manufacture and installation is shown;

[0025] Figure 5 A three-dimensional view of a circuit breaker base of a molded case circuit breaker according to the utility model is shown;

[0026] Figure 6 A three-dimensional view of a molded case circuit breaker housing and a base top of a circuit breaker base and a bottom plug installed at the position according to the utility model is shown;

[0027] Figure 7 A three-dimensional view of a molded case circuit breaker housing and a base top of a circuit breaker base and a bottom plug installed at the position according to the utility model is shown in a partially enlarged view, wherein the structure of the base top of the circuit breaker base is specifically shown;

[0028] Figure 8 A three-dimensional view of a molded case circuit breaker housing and a base bottom of a circuit breaker base and a bottom plug installed at the position according to the utility model is shown;

[0029] Fig. 9 A three-dimensional view of the molded case circuit breaker housing and the base base of the circuit breaker base and the bottom plug installed at the position according to the utility model is shown from another viewing angle, in which the structure of the base bottom of the circuit breaker base is specifically shown.

[0030] Reference numerals

[0031] 100 Bottom plug

[0032] 110 Bottom plug upper support plate

[0033] 111 Nut hole

[0034] 120 Bottom plug body

[0035] 121 First Depression

[0036] 122 Second Depression

[0037] 123 The third depression

[0038] 130 Bottom plug lower support plate

[0039] 131 Bottom plug first stopper

[0040] 132 Bottom plug second stopper

[0041] 140 Bottom plug back plate

[0042] 141 Bottom plug back plate first thrust surface

[0043] 142 Second thrust surface of bottom plug back plate

[0044] 200 Molded Case Circuit Breaker Housing

[0045] 210 Circuit breaker mask

[0046] 220 Circuit breaker upper cavity

[0047] 230 circuit breaker base

[0048] 231 Pedestal top

[0049] 2311 The first longitudinal slot on the top of the base

[0050] 2312 Second longitudinal slot on the top of the base

[0051] 2313 The first lateral thrust surface on the top of the base

[0052] 2314 Second lateral thrust surface on the top of the base

[0053] 2315 The first horizontal slot on the top of the base

[0054] 2316 The second horizontal slot on the top of the base

[0055] 2317 First support plate receiving part at the top of the base

[0056] 2318 The second support plate receiving part on the top of the base

[0057] 232 Base bottom

[0058] 2321 Longitudinal thrust surface at the bottom of the base

[0059] 2322 The first longitudinal slot at the bottom of the base

[0060] 2323 The second longitudinal slot at the bottom of the base

[0061] 2324 The first transverse thrust surface at the bottom of the base

[0062] 2325 Second transverse thrust surface at the bottom of the base

[0063] 2326 The first horizontal slot at the bottom of the base

[0064] 2327 The second horizontal slot at the bottom of the base

[0065] 2328 First support plate receiving part at the bottom of the base

[0066] 2329 The second support plate receiving part at the bottom of the base

[0067] 240 L-shaped busbar

[0068] 241 L-shaped busbar fixing part

[0069] 242 L-shaped busbar connection

[0070] 250 static contact busbar

[0071] 251 static contact connection

[0072] 252 Stationary contact fixing part

[0073] 253 static contact piece

[0074] 260 hollow nut

[0075] 261 Nut Cover

[0076] 262 Nut body

[0077] Width direction X Length direction Y Height direction Z DETAILED DESCRIPTION

[0078] The utility model is described below in conjunction with the accompanying drawings. It should be understood that the embodiments listed below are only used to illustrate the technical solution of the utility model, and are not intended to limit the utility model. The accompanying drawings are provided to present multiple implementations of the utility model, but the accompanying drawings do not have to be drawn according to the dimensions of the specific implementation scheme, and certain features may be enlarged, removed or partially cut to better illustrate and explain the disclosure of the utility model. Some components in the accompanying drawings can be adjusted in position according to actual needs without affecting the technical effect. The phrase "in the accompanying drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0079] Certain directional terms used to describe the drawings below, such as "inside", "outside", "upper", "lower", "top", "bottom" and other directional terms will be understood to have their normal meanings and refer to those directions involved when the drawings are normally viewed. Unless otherwise specified, the directional terms described in this specification are basically in accordance with the conventional directions understood by those skilled in the art.

[0080] The terms "first", "first", "second", "secondary", and the like used in the present invention do not indicate any order, quantity or importance, but are used to distinguish one component from other components. The expression "substantially" allows for a reasonable range of angular deviations, but does not mean absolute consistency.

[0081] Some implementation methods of the present utility model are described in detail below in conjunction with the accompanying drawings.

[0082] Reference Figure 1 The utility model provides a bottom plug 100 for installing a molded case circuit breaker. Figure 2-3 A molded case circuit breaker housing 200 suitable for installing the bottom plug 100 described in the present invention is shown.

[0083] Molded case circuit breaker of the utility model

[0084] Specifically, see Figure 2 and Figure 3 , the molded case circuit breaker housing 200 at least includes a circuit breaker mask 210, a circuit breaker upper cavity 220 and a circuit breaker base 230. The circuit breaker upper cavity 220 accommodates other modules such as the contact arc extinguishing module, the tripping component and the mechanical control module or the intelligent control module of the molded case circuit breaker. Then, the circuit breaker upper cavity 220 having components such as the contact arc extinguishing module, the tripping component and the mechanical control module or the intelligent control module is integrally buckled with the circuit breaker base 230 located therebelow. On the other hand, the circuit breaker mask 210 is located above the circuit breaker upper cavity 220 to cover the circuit breaker upper cavity 220 and the circuit breaker base 230, and displays key operating parameters of the circuit breaker together with its display device.

[0085] like Figure 2 As shown, the circuit breaker base 230 of the molded case circuit breaker is also provided with a plurality of installation positions for electrical connection on the top 231 of the base, and a plurality of installation positions for accommodating electrical connection at the bottom 232 of the base.

[0086] Further, refer to Figure 3A plurality of conductive static contact busbars 250 are arranged between the upper cavity 220 of the circuit breaker and the base 230 of the circuit breaker, especially near the top 231 of the base. The plurality of static contact busbars 250 are roughly configured in a "J" shape, and are respectively configured with a static contact connecting portion 251, a static contact fixing portion 252 and a static contact piece 253, wherein the static contact piece 253 located at the hook portion of the static contact busbar 250 can contact and separate from the moving contact built into the upper cavity 220 of the circuit breaker, thereby realizing the circuit connection and disconnection function of the circuit breaker; and the static contact fixing portion 252 roughly located in the middle of the static contact busbar 250 uses at least one pair of threaded holes to fasten the static contact busbar 250 to the corresponding portion of the upper cavity 220 of the circuit breaker. Furthermore, the static contact connection portion 251 of the hook portion away from the static contact busbar 250 has at least one pair of electrical access mounting holes arranged symmetrically along its transverse direction, so as to fix each external busbar and the static contact busbar 250 respectively by means of the hollow nut 260 and then engage with each bottom plug 100, thereby effectively electrically protecting each electrical access and electrical access of the circuit breaker by means of the bottom plug 100 at the base bottom 232 of the circuit breaker base 230. Further, referring to Figure 3-Figure 5In the vicinity of the multiple installation positions for electrical access located at the bottom 232 of the base, a corresponding multiple conductive L-shaped busbars 240 may also be provided. The L-shaped busbar 240 is generally L-shaped and is composed of an L-shaped busbar fixing portion 241 and an L-shaped busbar connecting portion 242 perpendicular to each other, wherein the L-shaped busbar fixing portion 241 is symmetrically arranged along its longitudinal axis with at least one pair of threaded holes for fixing the L-shaped busbar to the base bottom 232 of the circuit breaker base 230, and the L-shaped busbar connecting portion 242 is symmetrically arranged along its transverse direction with at least one pair of electrical connection installation holes, so as to fix each external busbar to the L-shaped busbar 240 with the help of a hollow nut 260 and then engage with each bottom plug 100, thereby effectively electrically protecting each electrical connection and electrical connection of the circuit breaker at the base bottom 232 of the circuit breaker base 230 with the help of the bottom plug 100. In view of this, the circuit breaker base 230 of the molded case circuit breaker is also provided with a plurality of electrical access installation parts at the top 231 of the base, and a plurality of electrical outlet installation parts are provided at the bottom 232 of the base. By means of electrical access at the top 231 of the base of the circuit breaker base 230 through the hollow nut 260, the static contact busbar 250 and the external busbar, and electrical outlet at the bottom 232 of the base of the circuit breaker base 230 through the hollow nut 260, the L-shaped busbar 240 and the external busbar, the molded case circuit breaker can be integrally placed in the outdoor circuit breaker box, electrically connected to a high-voltage outdoor power supply through the electrical access installation part at the top 231 of the base, and electrically connected to various electrical access circuits of the building through the electrical outlet installation part at the bottom 232 of the base. On the other hand, the molded case circuit breaker can also be installed as a whole in the unit circuit breaker box of each unit of the building, and electrically connected to the outdoor power supply circuit through the electrical access installation part 231 of the base top, and electrically connected to each indoor electrical access circuit of each unit through the electrical outlet installation part 232 of the base bottom. In addition, according to the model of the molded case circuit breaker, it can also be arranged indoors in the above-mentioned manner to connect between the outdoor circuit and the indoor circuit, so as to provide effective protection for the indoor power supply. In summary, the circuit breaker provided in this way can, on the one hand, provide power-off protection during overcurrent and short circuit, such as mechanically performing power-off protection or intelligently controlling power-off protection; on the other hand, the conductive parts of the molded case circuit breaker can also be effectively protected by the bottom plug 100 provided by the utility model, which has significant advantages over the prior art. The specific concept of this bottom plug will be elaborated in detail below.

[0087] Bottom plug

[0088] See also Figure 1 and Figure 2The utility model specifically provides a detachable bottom plug 100 that is easy to manufacture and process. Specifically, the bottom plug 100 is generally constructed in a stepped shape, and an integrally constructed bottom plug upper support plate 110, a bottom plug body 120, and a bottom plug lower support plate 130 are sequentially arranged along its longitudinal height direction, and the bottom plug lower support plate 130 has a larger size than the bottom plug upper support plate 110 in both the longitudinal direction and the longitudinal width direction of the bottom plug.

[0089] In a non-limiting embodiment of the present invention, the bottom plug upper support plate 110, the bottom plug body 120 and the bottom plug lower support plate 130 extend along the longitudinal width direction of the bottom plug 100 to the bottom plug back plate 140. In particular, the bottom plug back plate is perpendicular to the bottom plug upper support plate 110, the bottom plug body 120 and the bottom plug lower support plate 130, respectively, and the bottom plug back plate 140 protrudes beyond the bottom plug upper support plate 110 in the longitudinal height direction to form a bottom plug 100 of an integral structure having a generally stepped configuration.

[0090] In a non-limiting embodiment of the present invention, the bottom plug body 120 is indented from outside to inside at the position adjacent to the bottom plug back plate 140 and the position away from the bottom plug back plate 140 to form a first recess 121, a second recess 122 and a third recess 123 between the bottom plug upper support plate 110 and the bottom plug lower support plate 130, thereby forming a plug-in joint surface between the bottom plug 100 and the aforementioned molded case circuit breaker with the help of these recesses, facilitating the installation of the bottom plug 100 without the need for a threaded connection as mentioned in the aforementioned prior art. Further, due to the formation of these recesses, bottom plug back plate thrust surfaces are also constructed on both longitudinal sides of the bottom plug back plate 140 close to the bottom plug body 120, namely, the bottom plug back plate first thrust surface 141 and the bottom plug back plate second thrust surface 142, to play a role in limiting the bottom plug. This will be described in detail in conjunction with the shell structure of the molded case circuit breaker later, and will not be repeated here.

[0091] In a non-limiting embodiment of the present invention, the bottom plug 100 forms a pair of bottom plug stopper portions, namely, a first bottom plug stopper portion 131 and a second bottom plug stopper portion 132, which are symmetrically arranged and can be used to lock the bottom plug 100 to the aforementioned molded case circuit breaker on both sides of the longitudinal length of the bottom plug lower support plate 130. In particular, the first bottom plug stopper portion 131 and the second bottom plug stopper portion 132 are configured to have a latching finger extending slightly toward the longitudinal outer side of the bottom plug lower support plate 130, and a narrow latching finger gap is formed between the latching finger and the bottom plug lower support plate 130 for locking the corresponding part of the molded case circuit breaker. In this way, the connection between the bottom plug and the aforementioned molded case circuit breaker can be achieved in a simpler way.

[0092] In a non-limiting embodiment of the present invention, a pair of blind hole-shaped nut holes are formed from the bottom plug upper support plate 110 of the bottom plug 100 to the position of the bottom plug lower support plate 130 along the depth direction of the bottom plug 100. Further, each of the blind holes can be constructed in any shape to cooperate with its respective adapter, so as to be able to fix electrical access or electrical connection. And further, by means of the blind hole configuration, the conductor enclosed in each blind hole, that is, the blind hole cooperates with the adapter connected to the electrical connection line, for example, the bolt and nut cooperate to form the adapter surrounded by the blind hole, which can realize the electrical access connection between the external busbar and the static contact busbar 250 by means of the aforementioned hollow nut 260, and can realize the electrical connection between the external busbar and the L-shaped busbar 240. Furthermore, the closed structure of the two conductors of the electrical connection line can form a sealed protection for the terminal and the two conductors of the electrical connection line enclosed therein, so as to prevent pollutants such as rainwater and dust in the external environment from entering the conductor, thereby effectively protecting the molded case circuit breaker and allowing the molded case circuit breaker to be used safely and stably.

[0093] Connection structure at the top of the base

[0094] Figure 4 and Figure 6 A non-limiting embodiment of the present invention is shown, wherein the connection structure and arrangement of the bottom plug 100 of the breaker base 230 of the molded case circuit breaker at the top 231 of the base, and the connection structure and arrangement of the bottom plug 100 of the breaker base 230 of the molded case circuit breaker at the bottom 232 of the base are shown. Figure 5 The general structure of the circuit breaker base 230 of the molded case circuit breaker is shown. Figure 6 In FIG. 1 , the installation state of the bottom plug 100 connected to the base top 231 of the circuit breaker base 230 of the molded case circuit breaker is marked with a mark I, and Figure 7 1 shows a partial enlarged view of the bottom plug connected to the base top 231 of the circuit breaker base 230 of the molded case circuit breaker, and specifically shows the structure of the bottom plug 100 and the base top 231 of the circuit breaker base 230 of the molded case circuit breaker.

[0095] Therefore, we can Figure 7 and Figure 3-Figure 4 Combined with the bottom plug 100 and the base top 231 of the circuit breaker base 230 of the molded case circuit breaker adapted therewith, Figure 1 and Figure 2 The structure of the static contact busbar 250 connected to the bottom plug 100, especially the connection relationship formed by the special structure between the above components. Figure 6 and Figure 7It can be seen that the housing of the molded case circuit breaker has three electrical access installation locations arranged in sequence along the longitudinal width direction at the base top 231 of the circuit breaker base 230 to accommodate three-wire connection. Depending on the situation, the molded case circuit breaker can also have four electrical access installation locations arranged in sequence along the longitudinal width direction at the base top 231 to accommodate four-wire connection.

[0096] See Figure 6 and Figure 7 , a bottom plug 100 connected in a simple plug-in manner is shown at each location for accommodating a terminal on the base top 231 of the circuit breaker base 230 of the molded case circuit breaker. Figure 4 , wherein a single static contact busbar 250 is shown. When viewed from the back to the front of the circuit breaker base 230, the static contact busbar 250 is located at the position closest to the left wall of the circuit breaker upper cavity 220 installed between the circuit breaker upper cavity 220 and the circuit breaker base 230. The "J"-shaped static contact busbar 250 is vertically arranged along the longitudinal height direction Z of the circuit breaker base 230 of the molded case circuit breaker, and its hook portion is generally located in the middle of the cavity formed by the circuit breaker upper cavity 220 and the circuit breaker base 230, and at least one pair of static contact pieces 253 arranged on the hook portion face the circuit breaker upper cavity 220. Correspondingly, the moving contact of the circuit breaker is also arranged in the cavity formed by the circuit breaker upper cavity 220 and the circuit breaker base 230, and the moving contact piece of the moving contact just faces the static contact piece 253 of the static contact busbar 250. Correspondingly, the moving contact pieces of the moving contact are also arranged to be the same in number as the stationary contact pieces 253 of the stationary contact busbar 250, so as to ensure that the moving contact pieces of the moving contact are in close contact with the stationary contact pieces 253 of the stationary contact busbar 250, thereby realizing that the molded case short circuit breaker keeps the circuit connected in a normal state. Furthermore, by means of the other stationary contact busbars ( Figure 2-Figure 5 (not shown) can realize the electrical connection of the moving contact and the static contact in the case of three-phase three-wire or three-phase four-wire.

[0097] See also Figure 3 and Figure 4, with the help of the static contact connecting portion 251 arranged at the other end of the "J"-shaped static contact busbar 250 away from the hook portion, the external busbar for electrical connection can be connected to the static contact connecting portion 251 by using a hollow nut 260. Specifically, the static contact connecting portion 251 can have a pair of mounting holes in a circular or square shape or other shapes. With the help of the static contact connecting portion 251 with the mounting holes and the hollow nut 260, the external busbar for electrical connection can be fixed to the connecting portion 251 of the static contact by mechanical compression. Of course, those skilled in the art also have reason to use other known mechanical connection methods, such as plug-in connection and other methods to fix the external busbar for electrical connection to the connecting portion 251 of the static contact.

[0098] See further Figure 6 and Figure 7 These two figures show the arrangement of the bottom plug 100 between the upper cavity 220 of the circuit breaker and the circuit breaker base 230, which is closest to the left wall of the upper cavity 220 of the circuit breaker, and the specific structure of the base top 231 of the corresponding circuit breaker base 230. Figure 6 It can be seen that the bottom plug 100 is installed at the electrical access installation position of the circuit breaker base 230 with the rear surface of its bottom plug back plate 140 facing the rear surface of the circuit breaker base 230 and the bottom surface of the bottom plug lower support plate 130 facing the longitudinal height direction Z of the circuit breaker base 230. Specifically, the bottom plug 100 uses its first recess 121 and the second recess 122 which are opposite and formed between the bottom plug upper support plate 110 and the bottom plug lower support plate 130 to make insertion movement along the longitudinal width direction X of the circuit breaker base 230 relative to the first transverse groove 2315 and the second transverse groove 2316 of the base top of the electrical access installation part thereof and engage with the two, until the first thrust surface 141 and the second thrust surface 142 of the bottom plug back plate respectively abut against the first transverse thrust surface 2313 and the second transverse thrust surface 2314 of the base top 231 of the circuit breaker base 230. In addition, according to Figure 6 and Figure 7It can be seen that according to the molded case circuit breaker of the utility model, a first support plate receiving portion 2317 on the top of the base for receiving the upper support plate 110 of the bottom plug 100 and a second support plate receiving portion 2318 on the top of the base for receiving the lower support plate 130 of the bottom plug 100 are also constructed on the top of the base 231 of the circuit breaker base 230 of the molded case circuit breaker. As a result, the bottom plug 100 is completely accommodated in the corresponding installation space of the top of the base 231 of the circuit breaker base 230 after the first recess 121 and the second recess 122 thereof are inserted along the longitudinal width direction X of the circuit breaker base 230 respectively relative to the first transverse groove 2315 and the second transverse groove 2316 of the top of the base at its electrical access installation position and engaged with the two. It should be noted that, for the convenience of illustration, the structure of the base top 231 is identified by the electrical access installation position adjacent to the leftmost installed bottom plug 100, and the same applies to the following.

[0099] In the meantime, see Figure 3 and Figure 4 After the electrical connection is completed by using the hollow nut 260 having the nut cover 261 and the nut body 262, the hexagonal nut body 262 can be respectively inserted into and fixed to the corresponding nut hole 111 of the bottom plug 100 when the first recess 121 and the second recess 122 of the bottom plug 100 are respectively inserted along the longitudinal width direction X of the circuit breaker base 230 relative to the first transverse groove 2315 and the second transverse groove 2316 at the top of the base at the electrical connection installation position.

[0100] Furthermore, with the help of the first bottom plug stopper 131 and the second bottom plug stopper 132 arranged on the longitudinal side edges of the bottom plug lower support plate 130 of the bottom plug 100, the two respectively have a latching finger extending slightly toward the longitudinal outer side of the bottom plug lower support plate 130, and the two latching fingers are respectively engaged with the first longitudinal latching groove 2311 and the second longitudinal latching groove 2312 on the top of the base located at the top 231 of the circuit breaker base 230 and arranged along the longitudinal height direction Z of the circuit breaker base 230, thereby locking the bottom plug 100.

[0101] Connection structure at the bottom of the base

[0102] Similar to the above installation method, Figure 8 and Fig. 9 A non-limiting embodiment of a plurality of electrical connection installation locations and a bottom plug installation according to the present invention are shown from respective perspectives. Specifically, the bottom plug connection structure and arrangement of the circuit breaker base 230 of the molded case circuit breaker described in the present application at the bottom 232 of the base are shown.

[0103] Will Figure 8 and Figure 3 Combined with the above, the invention concept of the non-limiting embodiment can be understood, where it can be seen that the housing of the molded case circuit breaker is arranged with three electrical connection installation positions in sequence along the longitudinal width direction at the base bottom 232 of the circuit breaker base 230 to accommodate three-wire connection. Depending on the situation, the molded case circuit breaker can also be arranged with four electrical connection installation positions in sequence along the longitudinal width direction at the base bottom 232 to accommodate four-wire connection.

[0104] See Fig. 9 and Figure 3 , the L-shaped busbar 240 connected in a simple plug-in manner is shown at each position of the base bottom 232 of the circuit breaker base 230 of the molded case circuit breaker for accommodating the wiring terminals, and the bottom plug 100 can be further attached to the L-shaped busbar 240 in the direction facing the back of the circuit breaker base 230. Specifically, Figure 8 An L-shaped busbar 240 connected in a simple plug-in manner is shown on the side wall opposite to the longitudinal width direction X of the circuit breaker base 230. It is worth noting that in order to clearly show the connection between the L-shaped busbar 240 and the base bottom 232 of the circuit breaker base 230, the bottom plug 100 is hidden.

[0105] See further Fig. 9 , wherein a single L-shaped busbar 240 is shown. When viewed from the rear to the front of the circuit breaker base 230, the L-shaped busbar 240 is inserted into the corresponding electrical connection installation position of the base bottom 232 of the circuit breaker base 230 along the longitudinal direction Z by using the two outermost walls of its L-shaped busbar fixing portion 241 along the longitudinal direction X. It can also be seen that Figure 3 and Figure 4 See further Figure 4 The L-shaped busbar 240 also has an L-shaped busbar connection portion 242 integrally constructed with its L-shaped busbar fixing portion 241 in the vertical direction, wherein the L-shaped busbar connection portion 242 extends "L"-shaped or reverse "L"-shaped protrusions on both sides thereof along the longitudinal width direction X. When the L-shaped busbar 240 is inserted into the corresponding electrical connection installation position of the base bottom 232 of the circuit breaker base 230 along the longitudinal height direction Z with its L-shaped busbar fixing portion 241, the two "L"-shaped or reverse "L"-shaped protrusions belonging to the L-shaped busbar connection portion 242 will abut against the base bottom longitudinal thrust surface 2321 of the base bottom 232 of the circuit breaker base 230 for positioning, see Figure 8. Further, the L-shaped busbar 240 can be fastened to the circuit breaker base 230 or other components of the molded case circuit breaker by means of the mounting holes provided on the L-shaped busbar fixing portion 241 thereof. Accordingly, the L-shaped busbar 240 is also provided in the same number as the aforementioned static contact busbar 250, so as to be arranged in sequence along the longitudinal width direction X of the circuit breaker base 230 at the base bottom 232 of the circuit breaker base 230 to realize the electrical connection of the L-shaped busbar 240 in the case of three-phase three-wire or three-phase four-wire.

[0106] Furthermore, the external busbar for electrical connection can be connected to the L-shaped busbar connection part 242 by using a hollow nut 260. Specifically, the L-shaped busbar connection part 242 can have a pair of mounting holes in a circular or square shape or other shapes. With the help of the L-shaped busbar connection part 242 with the mounting holes and the hollow nut 260, the external busbar for electrical connection can be fixed to the L-shaped busbar connection part 242 by mechanical compression. Of course, those skilled in the art also have reason to use other known mechanical connection methods, such as screw and threaded hole connection, plug-in connection and other methods to fix the electrical connection for electrical connection to the L-shaped busbar connection part 242.

[0107] See Fig. 9 , the accompanying drawing specifically shows the structure of the base bottom 232 of the circuit breaker base 230, and the base bottom 232 also constructs a first longitudinal groove 2322 and a second longitudinal groove 2323 of the base bottom, a first transverse thrust surface 2324 and a second transverse thrust surface 2325 of the base bottom, a first transverse groove 2326 and a second transverse groove 2327 of the base bottom, and a first support plate receiving portion 2328 and a second support plate receiving portion 2329 of the base bottom.

[0108] The installation method of the bottom plug 100 on the base top 232 of the circuit breaker base 230 is the same as that of the bottom plug 100 described above. Specifically, the bottom plug 100 uses its opposite second recess 122 and first recess 121 to respectively insert and engage with the first transverse groove 2326 and the second transverse groove 2327 of the base bottom at its electrical access installation position along the longitudinal width direction X of the circuit breaker base 230, until the second thrust surface 142 and the first thrust surface 141 of the bottom plug back plate respectively abut against the first transverse thrust surface 2324 and the second transverse thrust surface 2325 of the base top located at the base bottom 232 of the circuit breaker base 230. In addition, according to Fig. 9It can be seen that according to the molded case circuit breaker of the utility model, a first support plate receiving portion 2328 at the top of the base for receiving the upper support plate 110 of the bottom plug 100 and a second support plate receiving portion 2329 at the top of the base for receiving the lower support plate 130 of the bottom plug 100 are also constructed at the base bottom 232 of the circuit breaker base 230 of the molded case circuit breaker. As a result, the bottom plug 100 is completely accommodated in the corresponding installation space of the base bottom 232 of the circuit breaker base 230 after the first recess 121 and the second recess 122 thereof are inserted along the longitudinal width direction X of the circuit breaker base 230 respectively relative to the first transverse groove 2326 and the second transverse groove 2327 of the base bottom of the electrical access installation portion thereof and engaged with the two.

[0109] At the same time, after the electrical connection is completed, the hollow nut 260 having the nut cover 261 and the nut body 262 can be respectively embedded and fixed to the corresponding nut hole 111 of the bottom plug 100 by using its hexagonal nut body 262 when the first recess 121 and the second recess 122 of the bottom plug 100 are inserted along the longitudinal width direction X of the circuit breaker base 230 relative to the first transverse groove 2326 and the second transverse groove 2327 of the bottom of the base at its electrical connection installation position.

[0110] Furthermore, with the help of the first bottom plug stopper 131 and the second bottom plug stopper 132 arranged on the longitudinal side edges of the bottom plug lower support plate 130 of the bottom plug 100, the two respectively have a latching finger extending slightly toward the longitudinal outer side of the bottom plug lower support plate 130, and the two latching fingers are respectively engaged with the first longitudinal latching groove 2322 and the second longitudinal latching groove 2323 of the base bottom arranged along the longitudinal height direction Z of the circuit breaker base 230 at the base bottom 232 of the circuit breaker base 230, thereby locking the bottom plug 100.

[0111] In summary, other bottom plugs can also be arranged in sequence to the base top 231 and base bottom 232 of the circuit breaker base 230 through the design of this simple bottom plug 100 and the circuit breaker base 230, without any physical labor of the operator. Further, the bottom plugs 100 are all constructed to the same size, and the electrical connection installation part of the base top 231 and the electrical connection installation part of the base bottom 232 connected thereto are also constructed to the same size. This highly interchangeable design is particularly convenient for the design, manufacturing and installation process, effectively sealing the conductive parts of the electrical connection and electrical connection in the housing of the molded case circuit breaker to effectively protect them from pollution, and avoiding the situation described in the prior art where the electrical gap between the conductive parts is too small due to the connection using screws or bolts.

[0112] Unless expressly excluded or otherwise limited, each document cited herein, including any cross-referenced or related patent or patent application and any patent application or patent to which this application claims priority or the beneficial effect thereof, is hereby incorporated by reference in its entirety. The reference to any document is not an admission that it is prior art to any disclosed or claimed invention of the present invention, or an admission that it proposes, suggests or discloses any such invention by itself or in combination with any one or more references. In addition, when any meaning or definition of a term in the present invention conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to the term in the present invention shall prevail.

[0113] Although the specific embodiments of the utility model have been illustrated and described, it is obvious to those skilled in the art that many other changes and modifications can be made without departing from the essence and scope of the utility model. Therefore, it is intended that all such changes and modifications within the scope of the utility model are covered in the appended claims.

Claims

1. A molded case circuit breaker, comprising a housing (200) comprising at least a circuit breaker mask (210), a circuit breaker upper cavity (220) and a circuit breaker base (230), wherein at least a contact arc extinguishing module, a tripping component and a mechanical control module or an intelligent control module of the molded case circuit breaker are accommodated, wherein: Also includes Multiple electrical input mounting locations and multiple electrical output mounting locations; A plurality of conductive static contact busbars (250), one end of which is capable of being electrically connected to or disconnected from the movable contact of the molded case circuit breaker, and the other end of which is suitable for being connected to the electrical access of the electrical access installation portion; A plurality of conductive L-shaped busbars (240) configured to be suitable for electrical connection between the molded case circuit breaker and an electrical connection installation location; A hollow nut (260) configured to have an end portion capable of being used for electrical connection with the stationary contact busbar (250) and for electrical connection with the L-shaped busbar (240); A bottom plug (100) configured to accommodate a main body of the hollow nut (260) and capable of respectively entering corresponding transverse slots located at the top of the base and / or at the bottom of the base along the longitudinal width direction X of the circuit breaker base (230) by means of its opposite first recess (121) and second recess (122); The upper support plate (110) of the bottom plug and the lower support plate (130) of the bottom plug can be respectively connected to the corresponding first support plate receiving portion and the corresponding second support plate receiving portion located at the top of the base and / or the bottom of the base, and can be locked with the longitudinal first card groove and the longitudinal second card groove located at the top of the base and / or the bottom of the base by means of the first locking portion (131) of the bottom plug and the second locking portion (132) of the bottom plug, so as to close the electrical input installation portion and / or the electrical output installation portion.

2. The molded case circuit breaker according to claim 1, characterized in that: A plurality of electrical input installation locations are evenly arranged along the longitudinal width direction X on the base top (231) of the circuit breaker base (230); and a plurality of electrical output installation locations are evenly arranged along the longitudinal width direction X on the base bottom (232) of the circuit breaker base (230).

3. The molded case circuit breaker according to claim 1, characterized in that: The plurality of conductive static contact busbars (250) are designed to be vertically arranged along a longitudinal height direction Z between the circuit breaker upper cavity (220) and the circuit breaker base (230), and adjacent to a plurality of electrical access installation locations on the base top (231); as well as A plurality of conductive L-shaped busbars (240) are designed to be arranged along a longitudinal height direction Z near a plurality of electrical connection installation locations of a base bottom (232) of the molded case circuit breaker.

4. The molded case circuit breaker according to claim 3, characterized in that: The stationary contact busbar (250) is generally in a "J"-shaped one-piece configuration and comprises a stationary contact connecting portion (251), a stationary contact fixing portion (252) and a stationary contact piece (253) for electrical connection and disconnection, wherein The stationary contact piece (253) is located at the hook portion of the stationary contact busbar (250), and The static contact connecting portion (251) opposite to the static contact piece (253) is symmetrically arranged with at least one pair of electrical access mounting holes along its transverse direction.

5. The molded case circuit breaker according to claim 3, characterized in that: The L-shaped busbar (240) is generally in an L-shaped one-piece configuration and has an L-shaped busbar fixing portion (241) and an L-shaped busbar connecting portion (242) perpendicular to each other, wherein At least one pair of electrical connection installation holes is symmetrically arranged along the longitudinal width direction X on the L-shaped busbar connection portion (242).

6. The molded case circuit breaker according to claim 1, characterized in that: The hollow nut (260) has at least a nut cover (261) and a hexagonal nut body (262), so as to electrically connect the external busbar to the static contact busbar (250) and electrically connect the external busbar to the L-shaped busbar (240) by means of a fastening connection.

7. The molded case circuit breaker according to claim 1, characterized in that: The bottom plug (100) is generally in a stepped shape, and is provided with an integrally constructed bottom plug upper support plate (110), a bottom plug body (120) and a bottom plug lower support plate (130) in sequence along its longitudinal height direction, and a pair of blind hole-shaped nut holes (111) formed between the bottom plug upper support plate (110) and the bottom plug lower support plate (130); and The bottom plug upper support plate (110), the bottom plug body (120) and the bottom plug lower support plate (130) extend along the longitudinal width direction of the bottom plug (100) to the bottom plug back plate (140).

8. The molded case circuit breaker according to claim 7, characterized in that: The bottom plug back plate (140) is respectively constructed with bottom plug back plate thrust surfaces on both longitudinal sides adjacent to the bottom plug body (120) for limiting the bottom plug back plate at the corresponding electrical input installation position and / or the corresponding electrical output installation position.

9. The molded case circuit breaker according to claim 8, characterized in that: The first bottom plug stopper (131) and the second bottom plug stopper (132) are configured to have stopper fingers extending toward the longitudinal outer side of the bottom plug lower support plate (130).

10. The molded case circuit breaker according to claim 9, characterized in that: The bottom plug (100) is made of insulating material.

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