Primary contact for movable switch cabinet and movable switch cabinet with primary contact

Abstract

The invention relates to a primary contact for a movable switch cabinet and the movable switch cabinet with the primary contact. The primary contact comprises a supporting shell which is arranged on the transverse side of the power distribution bus in the cabinet body, the supporting shell comprises a bottom plate, a pair of transverse side plates and a pair of longitudinal side plates, a mounting space is defined by the pair of transverse side plates and the pair of longitudinal side plates, and each transverse side plate is provided with a connecting opening penetrating in the transverse direction; the limiting plate extends in the mounting space in the longitudinal direction and is provided with a limiting opening penetrating in the transverse direction, and the limiting opening is aligned with the center of the connecting opening of each transverse side plate; the contact part is transversely placed in the mounting space and penetrates through the limiting opening of the limiting plate, and the end, close to the power distribution bus, of the contact part is connected to the power distribution bus through the adjacent connecting opening; wherein the longitudinal size of a section, opposite to the limiting plate in the longitudinal direction, of the contact component is smaller than the longitudinal size of the limiting opening, and the vertical size of the section is smaller than the vertical size of the mounting space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical equipment, and in particular to a primary contact for a draw-out switchgear cabinet and a draw-out switchgear cabinet having the same. BACKGROUND

[0002] The draw-out switchgear cabinet, such as a drawer-type switchgear cabinet or a handcart-type switchgear cabinet, is widely used in power systems due to its convenient maintenance and reliable power supply, and generally comprises a cabinet body and an extractable component movable relative to the cabinet body, so that when the extractable component is moved to a working position relative to the cabinet body, the connection terminals on the extractable component can be electrically connected with the power distribution bus fixed in the cabinet body to conduct the main circuit and ensure the safe and reliable operation of the switchgear cabinet.

[0003] However, in the prior art, the primary contact arranged on the extractable component and electrically connected with the connection terminals is generally used to be electrically connected with the power distribution bus, which is difficult to avoid the situation that the primary contact is not completely aligned with the power distribution bus when the extractable component moves to the power distribution bus, thereby possibly leading to the defect that the contact between the power distribution bus and the primary contact is not tight and unreliable, and further leading to the problems of increased contact resistance and excessively high temperature rise and even burning of the primary contact.

[0004] Therefore, there is a demand in the art for a primary contact with higher reliability. SUMMARY

[0005] The present application aims to provide a primary contact which can at least solve some of the above problems.

[0006] The present application also aims to provide a draw-out switchgear cabinet applying the improved primary contact.

[0007] According to one aspect of the present application, there is provided a primary contact for a draw-out switchgear, the draw-out switchgear comprising a cabinet and a draw-out component movable transversely relative to the cabinet, the cabinet being provided with a power distribution bus therein and the draw-out component being provided with a connection terminal thereon, the primary contact comprising: a support housing arranged in a transverse side of the power distribution bus in the cabinet, the support housing comprising a bottom plate, a pair of transverse side plates located on both transverse sides of the bottom plate, and a pair of longitudinal side plates located on both longitudinal sides of the bottom plate, the pair of transverse side plates and the pair of longitudinal side plates enclosing an installation space, and each transverse side plate being provided with a connection opening penetrating in the transverse direction; a limiting plate extending in the longitudinal direction in the installation space and being provided with a limiting opening penetrating in the transverse direction, the limiting opening being aligned with the center of the connection opening of each transverse side plate; a contact component placed in the installation space in the transverse direction and penetrating through the limiting opening of the limiting plate, the contact component being connected to the power distribution bus via the adjacent connection opening adjacent to the end portion of the power distribution bus; wherein the longitudinal dimension of the section of the contact component opposite to the limiting plate in the longitudinal direction is smaller than the longitudinal dimension of the limiting opening, and the vertical dimension of the section is smaller than the vertical dimension of the installation space, so that when the draw-out component moves towards the cabinet and the connection terminal is connected to the end portion of the contact component adjacent to the connection terminal via the adjacent connection opening, the end portion of the contact component adjacent to the connection terminal is movable relative to the end portion of the contact component adjacent to the power distribution bus.

[0008] Compared with the prior art, the primary contact in the present application is arranged on the side of the relatively fixed cabinet and connected to the power distribution bus, which can avoid repeated engagement and disengagement with the power distribution bus during the opening and closing of the switchgear, thereby avoiding wear on the power distribution bus. In addition, the contact component of the primary contact is arranged in the longitudinal and vertical directions relative to the limiting plate on the support housing, which allows the end portion of the contact component adjacent to the connection terminal to still be movable relative to the end portion of the contact component connected to the power distribution bus after the primary contact is installed to the cabinet and connected to the power distribution bus, thereby providing position compensation during the connection of the contact component and the connection terminal, and ensuring reliable connection between the contact component and the connection terminal.

[0009] Preferably, the contact component comprises: a pair of contact pieces extending in the transverse direction through the limiting opening and being longitudinally symmetrical about each other, the transverse ends of the pair of contact pieces being respectively configured for clamping the power distribution bus and the connection terminal; and a clamping member clamping together at least the sections of the pair of contact pieces opposite to the limiting opening in the longitudinal direction.

[0010] Preferably, the clamping member extends beyond the transverse ends of the limiting opening in the transverse direction; and the support housing further comprises a pair of limiting protrusions arranged on both transverse sides of the clamping member to limit the transverse movement of the clamping member relative to the support housing.

[0011] Preferably, the limiting plate comprises a pair of limiting plate members extending longitudinally from the pair of longitudinal side plates to cooperatively form the limiting opening, the pair of limiting plate members being arranged in parallel with respect to the bottom plate; the clamping member comprises a support section placed on the bottom plate and a pair of clamping sections located on both longitudinal sides of the support section, the pair of clamping sections being provided with abutting portions extending transversely and protruding towards each other to allow the pair of limiting plate members to be located vertically within adjacent abutting portions.

[0012] Preferably, a surface of each contact tab facing another contact tab adjacent to an end of the power bus is centrally arranged with a flat surface.

[0013] Preferably, segments of the pair of longitudinal side plates and the pair of contact tabs opposite to ends of the connection terminal are provided with a pair of buckle structures on sides facing away from each other for buckling cooperation with the cabinet body.

[0014] Preferably, a segment of the bottom plate opposite to the pair of buckle structures is provided with a vertical through avoiding opening extending transversely and communicating with an adjacent connection opening of the pair of contact tabs; the support shell is designed to be flexible to allow the segments of the pair of longitudinal side plates and the pair of contact tabs opposite to ends of the connection terminal to be able to move towards the avoiding opening under external force to release the buckling cooperation of the pair of buckle structures with the cabinet body.

[0015] Preferably, the bottom plate is further provided with a heat dissipation opening vertically through and communicating with the avoiding opening.

[0016] Preferably, each buckle structure comprises a pair of buckle protrusions protruding from the longitudinal side plate, a surface of a first buckle protrusion of the pair of buckle protrusions adjacent to the power bus is configured as a guide inclined surface facing the power bus, and a second buckle protrusion of the pair of buckle protrusions away from the power bus extends from the longitudinal side plate beyond the first buckle protrusion.

[0017] According to another aspect of the present application, there is also provided a draw-out switchgear comprising a cabinet body and a draw-out component movable transversely with respect to the cabinet body, the cabinet body being provided with a power bus and the draw-out component being provided with a connection terminal, the draw-out switchgear further comprising the primary contact as described above.

[0018] Some of the other features and advantages of the present application will be apparent from the detailed description that follows, taken in conjunction with the accompanying drawings, which together illustrate by way of example, not limitation, certain principles of the application. BRIEF DESCRIPTION OF DRAWINGS

[0019] Embodiments of the present application will be described below in detail with reference to the accompanying drawings, in which:

[0020] Figure 1 is an exploded view of a primary contact for a draw-out switchgear according to the present application;

[0021] Figure 2 is a perspective view of a primary contact for a draw-out switchgear according to the present application;

[0022] Figure 3 is a sectional view of a primary contact for a draw-out switchgear according to the present application;

[0023] Figure 4 is a top view of a primary contact for a draw-out switchgear according to the present application;

[0024] Figure 5 is a current path diagram of a primary contact for a draw-out switchgear according to the present application.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 100 - primary contact; 10 - support housing; 11 - bottom plate; 111 - avoiding opening; 112 - heat dissipation opening; 12 - transverse side plate; 121 - connecting opening; 13 - longitudinal side plate; 14 - limiting protrusion; 15 - buckle structure; 151 - buckle protrusion; 152 - guide slope; 20 - limiting plate; 21 - limiting opening; 22 - limiting plate piece; 30 - contact component; 31 - contact piece; 311 - straight section; 312 - curved section; 313 - guide section; 314 - flat surface; 32 - clamping piece; 321 - support section; 322 - clamping section; 323 - abutting portion. DETAILED DESCRIPTION

[0027] With reference to the drawings, the illustrative scheme of a primary contact for a draw-out switchgear disclosed by the present application will be described in detail. Although the drawings are provided to present some embodiments of the present application, the drawings are not necessarily drawn to scale of the specific embodiments, and certain features can be enlarged, removed or partially cut to better show and explain the disclosure of the present application. Some components in the drawings can be adjusted in position according to actual needs without affecting the technical effects. The phrase "in the drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0028] Some directional terms used to describe the drawings in the following, such as "inner", "outer", "upper", "lower" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when normally looking at the drawings. Unless otherwise specified, the directional terms described in the specification are basically according to the conventional directions as understood by those skilled in the art.

[0029] The terms "first", "the first", "second", "the second" and similar terms used in the present invention do not indicate any order, number or importance in the present invention, but are used to distinguish one component from other components.

[0030] The terms "engage", "connect" and similar terms used in the present invention include both indirect connection of two components together by means of an intermediate layer (such as an adhesive, a solder, etc.) or an intermediate piece (such as a connector, a transition piece, etc.), and direct connection of two components together without any intermediate layer (such as an adhesive, a solder, etc.) or an intermediate piece (such as a connector, a transition piece, etc.).

[0031] Figures 1 to 5 A single contact 100 of the present invention is shown by way of example, which can be mounted to a cabinet body of a draw-out switchgear and electrically connected with a power distribution busbar on the side of the cabinet body, so that when an extractable component of the draw-out switchgear is moved in place in the transverse direction towards the cabinet body, the single contact 100 can be electrically connected with a connection terminal on the side of the extractable component, thereby electrically connecting the power distribution busbar with the connection terminal via the single contact 100 to conduct the main circuit, and also avoiding wear on the power distribution busbar. It can be understood that "transverse direction" herein is the left-right direction of the drawings shown, Figure 4 "longitudinal direction" is the up-down direction of the drawings shown, Figure 4 and "vertical direction" is the inside-outside direction of the drawings shown. Figure 4

[0032] Wherein, the power distribution busbar can extend in the vertical direction within the cabinet body and a busbar clamp extending in the transverse direction can be provided thereon to fixedly mount the power distribution busbar to the cabinet body via the busbar clamp. The single contact 100 can be fixedly mounted to the busbar clamp, thereby being fixedly arranged on the transverse side of the power distribution busbar facing the extractable component and electrically connected with the power distribution busbar. As shown in Figure 1 and Figure 2 The single contact 100 can include a support housing 10, a limiting plate 20 and a contact component 30.

[0033] Specifically, the support housing 10 can be generally designed as a hollow cuboid structure, which can include a bottom plate 11, a pair of transverse side plates 12 and a pair of longitudinal side plates 13. The transverse side plates 12 extend in the longitudinal direction and are arranged on the transverse sides of the bottom plate 11, while the longitudinal side plates 13 extend in the transverse direction and are arranged on the longitudinal sides of the bottom plate 11, so that the pair of transverse side plates 12 and the pair of longitudinal side plates 13 enclose the mounting space on the periphery of the bottom plate 11 for mounting subsequent parts. The transverse side plates 12 can be provided with a connecting opening 121 extending through in the transverse direction, so that the mounting space of the support housing 10 can be communicated with the outside via the connecting openings 121 of the two transverse side plates 12.

[0034] ​The limiting plate 20 can be arranged longitudinally within the installation space and has a limiting opening 21 extending laterally. The limiting opening 21 is aligned with the center of the connecting openings 121 located on both sides of the limiting opening 21, so as to a certain extent, the power distribution bus, contact component 30, and connecting terminal are arranged coaxially. The contact component 30 can be placed laterally within the installation space and passes through the limiting opening 21 of the limiting plate 20, so that the portion of the contact component 30 opposite to the limiting plate 20 is limited by the limiting plate 20, while the portions of the contact component 30 located on both sides of the limiting plate 20 are used for electrical connection to the power distribution bus and the connecting terminal, respectively. In practical applications, the limiting plate 20 can be integrally formed with the support housing 10.

[0035] Combination Figure 3 As shown, the longitudinal dimension of the section of the contact component 30 opposite to the limiting plate 20 is smaller than the longitudinal dimension of the limiting opening 21, thereby allowing this section to move longitudinally relative to the support housing 10 within the limiting opening 21. The top side of the support housing 10, which is fixed to the cabinet via a busbar clamp, is closed by the busbar clamp or the cabinet. With the top surfaces of the longitudinal side plate 13 and the transverse side plate 12 of the support housing 10 substantially flush, the vertical dimension of the installation space of the support housing 10 is essentially equal to the dimensions of the longitudinal side plate 13 and the transverse side plate 12 of the support housing 10. The section of the contact component 30 opposite to the limiting plate 20 is also configured such that its vertical dimension is smaller than the vertical dimension of the installation space, thereby allowing this section to move vertically relative to the support housing 10 within the limiting opening 21 and even deflect.

[0036] In this manner, when the end of the contact component 30 adjacent to the power distribution bus is connected to the power distribution bus via the adjacent connection opening 121, when the removable component moves toward the cabinet and the connection terminal is connected to the end of the contact component 30 adjacent to the connection terminal via the adjacent connection opening 121, even if the connection terminal and the contact component 30 connected to the power distribution bus are slightly misaligned due to manufacturing and installation errors or deviations caused by long-term use, the end of the contact component 30 adjacent to the connection terminal can move relative to the end of the contact component 30 adjacent to the power distribution bus during the connection with the connection terminal, thereby providing a certain positional compensation to ensure reliable contact between the contact component 30 and the connection terminal.

[0037] like Figure 1 and Figure 2 As shown, the contact component 30 may include a pair of contact pieces 31 extending laterally and arranged symmetrically about each other longitudinally, and a clamping member 32, such as a snap ring, for clamping the pair of contact pieces 31. Figure 4As shown, the contact piece 31 can include a straight section 311 extending in the transverse direction and a curved section 312 extending from both sides of the straight section 311 in the transverse direction, wherein the straight section 311 of the contact piece 31 abuts against the straight section 311 of another contact piece 31 and the curved section 312 protrudes away from the another contact piece 31, so that the curved sections 312 of a pair of contact pieces 31 adjacent to the power busbar can cooperate to clamp the power busbar, and the curved sections 312 adjacent to the connecting terminal can cooperate to form a clamping for the connecting terminal.

[0038] Optionally, the curved section 312 of the contact piece 31 can further be provided with a guide section 313 on the side away from the straight section 311, which can also be configured in a curved shape extending away from the guide section 313 of another contact piece 31 and smoothly transitioned with the curved section 312, so that the guide sections 313 on both sides of a pair of contact pieces 31 can respectively guide the power busbar and the connecting terminal into the corresponding curved sections 312 and be clamped by the corresponding curved sections 312.

[0039] Advantageously, the end of the curved section 312 of the contact piece 31 adjacent to the power busbar, i.e. the portion of the surface of the contact piece 31 adjacent to the intersection of the guide section 313 and the curved section 312 facing the another contact piece 31, is designed as a flat surface 314, for example, which is located substantially in the middle of the curved section 312 in the vertical direction. Thus, the surface of the curved section 312 facing the another contact piece 31 can include the flat surface 314 and curved surfaces on both sides of the flat surface 314 in the vertical direction, which not only can increase the contact area of the contact piece 31 with the power busbar to ensure reliable connection therebetween, but also can divide the contact surface profile of the contact piece 31, thereby avoiding possible point contact between the contact piece 31 and the power busbar due to unevenness of single-sided machining.

[0040] Further combining Figure 5 As shown, after the main circuit of the draw-out switchgear is turned on, the current flows from the power busbar to the connecting terminal through the contact piece 31 in the direction of the current i. A pair of contact pieces 31 are installed longitudinally symmetrically about each other, according to the right-hand rule, the magnetic fields of a pair of contact pieces 31 in the middle region in the longitudinal direction cancel each other out, while the magnetic field directions of the side of each contact piece 31 facing away from the another contact piece 31 are opposite, as shown by the letter B in the figure. According to the left-hand rule, the anemophore of each contact piece 31 in the magnetic field is in the longitudinal direction towards the another contact piece 31, as shown by the letter F in the figure, so that a pair of contact pieces 31 can clamp the power busbar and the connecting terminal located between the pair of contact pieces 31. In particular when a short-circuit fault occurs in the draw-out switchgear, the clamping force of a pair of contact pieces 31 for clamping the power busbar and the connecting terminal will increase, thereby avoiding repulsion between a pair of contact pieces 31, and at this time the contact resistance is smaller, which is beneficial to reduce the temperature rise.

[0041] As Figure 3As shown, the clamping member 32 may include a support section 321 and a pair of clamping sections 322 located on both sides of the longitudinal direction of the support section 321. The support section 321 is placed on the base plate 11 and its longitudinal dimension exceeds the longitudinal dimension of the limiting opening 21. The clamping sections 322 are provided with abutment portions 323 that extend laterally and protrude toward the other clamping section 322, such that the pair of clamping sections 322 have a minimum longitudinal distance at the abutment portions 323 and the longitudinal distance is less than the longitudinal dimension of the limiting opening 21.

[0042] The limiting plate 20 may include a pair of limiting plates 22, which extend longitudinally from a pair of longitudinal side plates 13 to form a limiting opening 21. The limiting plates 22 may be arranged parallel to the base plate 11 so that the limiting plates 22 can easily extend into the abutment portion 323 of the clamping section 322 of the adjacent contact piece 31. That is, the limiting plates 22 are arranged longitudinally and vertically spaced from the clamping sections 322 of the adjacent contact piece 31, and the limiting plates 22 located in the abutment portion 323 of the clamping section 322 of the contact piece 31 in the vertical direction can prevent the clamping member 32 from vertically disengaging from the support housing 10 after the clamping member 32 is installed to the support housing 10.

[0043] Combination Figure 2 and Figure 4 As shown, the clamping member 32 is arranged longitudinally opposite to the limiting plate 20 and extends laterally beyond both ends of the limiting plate 20. Therefore, the support housing 10 may also provide a pair of limiting protrusions 14 on both lateral sides of the clamping member 32 to laterally confine the clamping member 32 within the support housing 10. The straight section 311 of the contact piece 31 may extend laterally beyond the pair of limiting protrusions 14, so the limiting protrusions 14 may correspondingly have openings extending laterally to allow the contact piece 31 to pass through. The limiting protrusions 14 are also spaced apart from the straight section 311 of the contact piece 31, and the distance between the limiting protrusions 14 and the contact piece 31 is preferably greater than the distance between the clamping member 32 and the limiting plate 20 to allow positional compensation when the contact piece 31 is connected to the connecting terminal.

[0044] like Figure 4 As shown, the curved segment 312 of the contact piece 31 adjacent to the distribution busbar can extend from the straight segment 311 away from another curved segment 312 beyond the adjacent limiting protrusion 14, thereby preventing the contact piece 31 from moving away from the distribution busbar when it is inserted into the distribution busbar. In this case, the connection opening 121 on the transverse side plate 12 adjacent to the distribution busbar can be designed to be large enough to allow the curved segment 312 of the contact piece 31 adjacent to the distribution busbar to extend directly from the support housing 10, or even the transverse side plate 12 adjacent to the distribution busbar can be ignored.

[0045] like Figure 1 , Figure 2 and Figure 4As shown, the curved segment 312 of the contact 31 adjacent to the connection terminal can be accommodated in the support housing 10 and supported by the bottom plate 11 of the support housing 10 to improve the stability of the contact 31 and the connection terminal connecting device. The side plate of the longitudinal side plate 13 facing away from the other longitudinal side plate 13 can be provided with a buckle structure 15 to buckle connect with the busbar clamp on the side of the cabinet and subsequently facilitate the removal from the busbar clamp. The buckle structure 15 can include a pair of buckle protrusions 151 protruding longitudinally from the longitudinal side plate 13 on which the buckle protrusions 151 are arranged transversely spaced apart to form a recess therebetween, so as to be connected with the corresponding protrusions on the busbar clamp. Preferably, the surface of the first buckle protrusion 151a of the pair of buckle protrusions 151 adjacent to the power distribution busbar facing the power distribution busbar can be designed as a guide inclined surface 152 to facilitate guiding the support housing 10 to be connected to the busbar clamp. The second buckle protrusion 151b of the pair of buckle protrusions 151 away from the power distribution busbar, i.e. the second buckle protrusion 151b adjacent to the connection terminal, extends longitudinally beyond the first buckle protrusion 151a to form a stop when the support housing 10 is installed to the busbar clamp to limit the maximum insertion depth of the support housing 10 relative to the busbar clamp.

[0046] Further, the bottom plate 11 can be provided with a vertical avoiding opening 111 and a heat dissipation opening 112. The avoiding opening 111 is arranged on the section of the bottom plate 11 opposite to the buckle structure 15 and communicates with the adjacent connection opening 121. Based on this, the support housing 10 can be made of a material with elasticity, such as plastic. In this way, when it is necessary to remove the support housing 10 from the busbar clamp, the operator can hold the buckle protrusion 151 adjacent to the connection terminal and force the pair of side plates to deform and move towards each other, i.e. towards the avoiding opening 111, so that the buckle structure 15 on the longitudinal side plate 13 is disengaged from the busbar clamp, and then the user can remove the contact 100 from the busbar clamp and the power distribution busbar. In addition, the avoiding opening 111 can also be arranged between the curved ends of the pair of contacts 31 to ensure the support of the contacts 31 by the support housing 10.

[0047] The heat dissipation opening 112 can be arranged on the side of the avoiding opening 111 adjacent to the limiting plate 20 and communicates with the avoiding opening 111 to possibly increase the hollow area on the bottom plate 11, so as to reduce the temperature rise and improve the heat dissipation effect. It can be seen from Figure 4 It can be seen from the above that the heat dissipation opening 112 is formed as a quadrilateral opening to provide support for the contact 31, and the avoiding opening 111 communicates with the heat dissipation opening 112 with a substantially constant longitudinal dimension, and is connected to the adjacent connection opening 121 with an increasing longitudinal dimension, so as to increase the degree of deformation of the longitudinal side plate 13 under external force.

[0048] It should be understood that although the present specification is described in terms of various embodiments, not every embodiment need necessarily include every independent technique described herein, and description of a particular embodiment as including particular techniques is meant to be illustrative only and not to be limiting. One of skill in the art will understand that the specification as a whole is intended to be a complete description of the various techniques described herein, and that the techniques described in each embodiment can be combined with techniques described in other embodiments to form other techniques that are within the scope of the present specification.

[0049] The above description is only the illustrative specific implementation of the present application, and is not used to limit the scope of the present application. Any equivalent changes, modifications and combinations made by those skilled in the art without departing from the concept and principle of the present application shall fall within the scope of the present application.

Claims

1. A primary contact (100) for a draw-out switchgear cabinet, the draw-out switchgear cabinet comprising a cabinet body and a draw-out part which is movable transversely relative to the cabinet body, a power distribution bus being provided in the cabinet body and a connection terminal being provided on the draw-out part, characterized in that The primary contact (100) comprises: a support housing (10) arranged in the cabinet body at the lateral side of the power distribution bus, the support housing (10) comprising a bottom plate (11), a pair of lateral side plates (12) located at the lateral sides of the bottom plate (11), and a pair of longitudinal side plates (13) located at the longitudinal sides of the bottom plate (11), the pair of lateral side plates (12) and the pair of longitudinal side plates (13) enclosing a mounting space, and each lateral side plate (12) being provided with a connection opening (121) extending through in the lateral direction; a limiting plate (20) extending in the longitudinal direction within the mounting space and being provided with a limiting opening (21) extending through in the lateral direction, the limiting opening (21) being aligned with the center of the connection opening (121) of each lateral side plate (12); a contact component (30) placed in the mounting space in the lateral direction and passing through the limiting opening (21) of the limiting plate (20), the contact component (30) being connected to the power distribution bus via the adjacent connection opening (121) adjacent to the end of the power distribution bus; wherein the longitudinal dimension of the section of the contact component (30) opposite to the limiting plate (20) is smaller than the longitudinal dimension of the limiting opening (21) and the vertical dimension of the section is smaller than the vertical dimension of the mounting space, so that the end of the contact component (30) adjacent to the connection terminal can move relative to the end of the connection terminal connected to the end of the power distribution bus via the adjacent connection opening (121) when the extractable component moves towards the cabinet body.

2. A primary contact (100) for a draw-out switchgear cabinet according to claim 1, characterized in that The contact component (30) comprises: a pair of contact pieces (31) extending through the limiting opening (21) in the lateral direction and being longitudinally symmetrical about each other, the lateral ends of the pair of contact pieces (31) being respectively configured for clamping the power distribution bus and the connection terminal; a clamping piece (32) clamping together at least the sections of the pair of contact pieces (31) opposite to the limiting opening (21) in the longitudinal direction.

3. The primary contact (100) for the withdrawable switchgear according to claim 2, wherein: the clamping piece (32) extends beyond the lateral ends of the limiting opening (21) in the lateral direction; the support housing (10) further comprises a pair of limiting protrusions (14) arranged at the lateral sides of the clamping piece (32) to limit the lateral movement of the clamping piece (32) relative to the support housing (10).

4. The primary contact (100) for the withdrawable switchgear according to claim 2, wherein: the limiting plate (20) comprises a pair of limiting plate pieces (22) extending from the pair of longitudinal side plates (13) in the longitudinal direction to cooperatively form the limiting opening (21), the pair of limiting plate pieces (22) being arranged in parallel relative to the bottom plate (11). The clamping piece (32) comprises a support section (321) placed on the bottom plate (11) and a pair of clamping sections (322) located on both longitudinal sides of the support section (321), and the pair of clamping sections (322) are provided with abutting portions (323) extending in the transverse direction and protruding towards each other to allow the pair of limiting plate pieces (22) to be located in the vertically adjacent abutting portions (323).

5. A single contact (100) for a draw-out switchgear cabinet according to claim 2, characterized in that The surface of each contact piece (31) facing the other contact piece (31) adjacent to the end of the power distribution bus is centrally provided with a flat surface (314).

6. A single contact (100) for a draw-out switchgear cabinet according to claim 2 or 3, characterized in that The sections of the pair of longitudinal side plates (13) opposite to the end of the pair of contact pieces (31) adjacent to the connecting terminal are provided with a pair of buckle structures (15) on the side surfaces facing away from each other for buckling with the cabinet body.

7. The primary contact (100) for a draw-out switchgear according to claim 6, characterized in that, The section of the bottom plate (11) opposite to the pair of buckle structures (15) is provided with a vertical through avoiding opening (111), and the avoiding opening (111) extends in the transverse direction inside the longitudinal direction of the pair of contact pieces (31) and communicates with the adjacent connecting opening (121); The support shell (10) is designed to be elastic to allow the sections of the pair of longitudinal side plates (13) opposite to the end of the pair of contact pieces (31) adjacent to the connecting terminal to be able to move towards the avoiding opening (111) under the action of external force to decouple the pair of buckle structures (15) from the cabinet body.

8. A single contact (100) for a draw-out switchgear cabinet according to claim 7, characterized in that The bottom plate (11) is further provided with a vertical through heat dissipation opening (112) communicating with the avoiding opening (111).

9. A single contact (100) for a draw-out switchgear cabinet according to claim 6, characterized in that Each buckle structure (15) comprises a pair of buckle protrusions (151) protruding from the longitudinal side plate (13) where it is located, and the surface of the first buckle protrusion (151a) of the pair of buckle protrusions (151) adjacent to the power distribution bus facing the power distribution bus is configured as a guide inclined surface (152), and the second buckle protrusion (151b) of the pair of buckle protrusions (151) away from the power distribution bus extends from the longitudinal side plate (13) where it is located beyond the first buckle protrusion (151a).

10. A draw-out switchgear comprising a cabinet and a draw-out part which is movable transversely with respect to the cabinet, a power distribution bus being provided in the cabinet and connection terminals being provided on the draw-out part, characterized in that, The draw-out switchgear further comprises the primary contact (100) according to any one of claims 1 to 9.

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