Group of busbar guide rails

Abstract

The invention relates to a set of busbar rails (2L, 2M, 2R) for a current collection device, having a left busbar rail (2L), a middle busbar rail (2M) and a right busbar rail (2R), each having a top end (6K) and a bottom end (6F) along the longitudinal central axis (4) thereof, and each having a first through-hole (8) at the top end thereof for guiding a connection bolt, the center of the first through hole of the middle busbar guide rail is located on the longitudinal center axis of the middle busbar guide rail, so that when the middle busbar guide rail is overturned around the longitudinal center axis, the position of the first through hole relative to the longitudinal center axis remains unchanged; the first via hole of the left side busbar guide rail and the first via hole of the right side busbar guide rail are respectively located at the same distance d relative to the longitudinal central axis of the busbar guide rails, so that when the busbar guide rails (2L, 2R) are overturned around the corresponding longitudinal central axis, the first via holes are mirrored relative to the position of the corresponding longitudinal central axis.

Description

Technical Field

[0001] The invention relates to a group of busbar guide rails, a current collection device and a combination of a contactor and the current collection device. Background Art

[0002] Contactors are available in different sizes, which cover different current ranges. Current sensing may be required for the contactor's triggering function. To do this, a current sensing device can be connected in series with the contactor in the load circuit.

[0003] Until now, such current sensing devices have been available in different sizes, so that the spacing of their busbar rails corresponds to the corresponding dimensions of contactors of different sizes. An example is the Siemens SIMOCODE pro 3UF7 current sensing module for a current range of 20-630 A. In the "Schienenanschlusstechnik" technical specification (busbar technology), this current sensing module is available in two different sizes: a first, smaller size is intended for a current range of 20-200 A, and a second, larger size is intended for a current range of 63-630 A. Thus, the smaller size is intended for busbars to smaller contactors (e.g., contactors with an S6 size, such as the Siemens 3RT105 / 3RT145 contactors), while the larger size is intended for busbars to larger contactors (e.g., contactors with an S10 size, such as the Siemens 3RT106 / 3RT146 contactors). In the brochure "Industrielle Schalttechnik-Motormanagement-und The SIMOCODE pro current acquisition module 3UF7 is described in the “SIMOCODE pro” publication 02 / 2023. A5E40507294001A / RS-AG / 007, Siemens AG, Smart Infrastructure, Electrical Products, Post Office 10 09 53, 93009 Regensburg, DEUTSCHLAND, Stand 03 / 2023 (“Industrial Control Technology – Motor Management and Switchgear SIMOCODE pro”, Issue 02 / 2023, A5E40507294001A / RS-AG / 007, Siemens AG, Smart Infrastructure, Electrical Products, Post Office 10 09 53, 93009 Regensburg, Germany, as of 03 / 2023).

[0004] A disadvantage of the different sizes of the current sensing devices is the outlay for storage. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to improve the current collection device.

[0006] According to the present invention, the above-mentioned technical problem is solved by a set of busbar rails for a current collection device. The set of busbar rails comprises a left busbar rail, a middle busbar rail, and a right busbar rail, each having a top and a bottom end along its longitudinal center axis, and each having a first through-hole at its top end for guiding a connecting bolt. The center of the first through-hole in the middle busbar rail is located on its longitudinal center axis, so that when the middle busbar rail is rotated about its longitudinal center axis, the orientation of the first through-hole with respect to the longitudinal center axis remains unchanged. Furthermore, the first through-hole in the left busbar rail and the first through-hole in the right busbar rail are located at the same distance d from their longitudinal center axes, so that when the busbar rails are rotated about their respective longitudinal center axes, the orientations of the first through-holes with respect to the respective longitudinal center axes become mirror images. In other words, the first through-hole in the left busbar rail and the first through-hole in the right busbar rail are not centered, i.e., are eccentric with respect to their respective longitudinal center axes.

[0007] Furthermore, the above-described technical problem is solved by a current collection device having a set of busbar rails as described above. The current collection device includes a housing having a front face and three first openings arranged in a straight line within the housing: a first opening on the left side, a first opening in the middle, and a first opening on the right side. The three first openings are for inserting the busbar rails. The corresponding busbar rails, namely the left busbar rail, the middle busbar rail, and the right busbar rail, are each inserted at their bottom ends into the three first openings, thereby being secured within the housing. The two outer first openings are equidistant from the middle first opening. The busbar rails each extend from the housing at their top ends, with the first vias pointing toward the front face of the housing. The left busbar rail and the right busbar rail can each be inserted into the corresponding first opening by rotating them in 180-degree increments about their respective longitudinal center axes. When the left and right bus rails are inserted into their respective first openings so that their first vias are displaced toward each other, the first vias of the left and right bus rails have the same smaller distance d1 relative to the first vias of the center bus rail. When the left and right bus rails are inserted into their respective first openings so that their first vias are displaced away from each other, the first vias of the left and right bus rails have the same larger distance d2 relative to the first vias of the center bus rail.

[0008] Furthermore, the above technical problem is solved by a combination of a contactor and a current acquisition device. The current acquisition device is connected in series with the contactor. The current acquisition device can provide measurement data required for a triggering function of the contactor. The busbar rails of the current acquisition device are connected to the electrical contacts of the contactor. The contactor is available in either of two structural sizes, and the left and right busbar rails of the current acquisition device are inserted into their respective first openings, depending on the structural size of the contactor, such that their first vias are displaced toward or away from each other.

[0009] The present invention is based on the idea that, by eccentrically arranging the first vias on the two outer busbar rails, which are provided for establishing electrical connections to contactors, two different distances between the busbar rails can be achieved, depending on how the busbar rails are tilted. This significantly reduces the number of current collection devices that must be stocked: only a single housing for the current collection device remains; and depending on the overall size of the contactor to be connected, the busbar rails can be tilted in one direction or the other, thereby achieving two different distances between the busbar conductors.

[0010] Advantageous embodiments and developments of the invention are given in the following description.

[0011] According to a preferred design of a set of busbar rails, the busbar rails have a rectangular profile transverse to the longitudinal center axis, with two narrow sides and two wide sides. The left and right busbar rails each have a bend at their top ends, such that the narrow sides in the top region are offset relative to the narrow sides in the bottom region. Depending on the positioning, the bends of the left and right busbar rails face toward or away from each other. This bend allows for an eccentric arrangement of the first vias, while also saving material in the busbar rails.

[0012] According to a preferred embodiment of a set of busbar rails, each busbar rail has a second through-hole at its bottom end for guiding a connecting bolt through. The center of each second through-hole is located on the corresponding longitudinal center axis, so that when the busbar rail is tilted about the corresponding longitudinal center axis, the orientation of the second through-hole relative to the corresponding longitudinal center axis remains unchanged. This has the advantage that, while two different distances between the busbar rails can be achieved, the busbar rails remain fixed in the housing of the current collection device.

[0013] According to a preferred embodiment of a current collecting device having a set of busbar rails, the busbar rails are each fixed at their bottom ends to the interior of the housing by means of a second through-hole. This has the advantage that, while two different distances between the busbar rails can be achieved, the fixing of the busbar rails in the housing of the current collecting device remains unchanged. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The characteristics, features and advantages of the present invention described above and their implementation will become clearer and easier to understand through the following description of embodiments, which will be explained in more detail with reference to the accompanying drawings. In the accompanying drawings, which are schematically shown and not to scale:

[0015] Figure 1 A conventional current acquisition device having a first smaller structural size is shown, which is connected to a contactor having a first smaller structural size;

[0016] Figure 2 A conventional current acquisition device having a second larger structural size is shown, which is connected to a contactor having a second larger structural size;

[0017] Figure 3 A conventional busbar rail is shown;

[0018] Figure 4 The busbar rail is shown;

[0019] Figure 5 A current sensing device connected to a contactor having a first smaller structural size is shown;

[0020] Figure 6 A current collecting device connected to a contactor having a second larger structural size is shown;

[0021] Figure 7 A first arrangement of the current collection device and the busbar rail is shown;

[0022] Figure 8 A second arrangement of the current collection device and the busbar rail is shown;

[0023] Figure 9 The front side of the housing is shown;

[0024] Figure 10 Shown Figure 8 The top surface of the shell;

[0025] Figure 11 Shown Figure 8 The back of the shell;

[0026] Figure 12 Shown Figure 8 the bottom surface of the shell;

[0027] Figure 13 Shown Figure 8 The right side of the shell;

[0028] Figure 14 The bottom end of the busbar rail is shown; and

[0029] Figure 15 Shows the connection between the current acquisition device and the contactor. DETAILED DESCRIPTION

[0030] Figures 1 to 3 The prior art shows that contactors are available in different sizes. Conventional current collection devices S1 and S2 are also available in different sizes, with the sizes of the current collection devices S1 and S2 being adapted to the sizes of the contactors. Consequently, only the contactors and the current collection devices can be electrically connected via busbar rails.

[0031] Figure 1 A conventional current collecting device S1 of a first smaller size is shown, which is electrically conductively connected to a contactor 16A of a first smaller size by means of a rail connection.

[0032] To establish an electrical connection, the current collecting device S1 has three busbars 2 arranged linearly side by side, projecting upward from the housing 22 of the current collecting device S1. These busbars 2 can be provided for each phase of a three-phase power grid. The busbars 2 include a left busbar 2L, a center busbar 2M, and a right busbar 2R. The distance e1 between the longitudinal center axes of the left busbar 2L and the center busbar 2M at the point of exit of the left busbar 2L and the center busbar 2M from the housing 22 is equal to the distance e1 between the longitudinal center axes of the center busbar 2M and the right busbar 2R at the point of exit of the center busbar 2M and the right busbar 2R from the housing 22.

[0033] The busbar rails 2 each have a through-hole in their end sections, which is arranged in the center of the busbar rail 2. Since the busbar rail 2 extends along a straight line, the distance d1 between the through-holes 8 of the busbar rail 2 corresponds to the distance e1 between the longitudinal center axes of the busbar rails 2 at the point of exit of the busbar rail 2 from the housing 22.

[0034] The contactor 16A has three electrical contacts 10 arranged linearly side by side, extending downward from the housing 36 of the contactor 16A. The contacts 10 include a left contact 10L, a middle contact 10M, and a right contact 10R. Each of the contacts 10 of the contactor 16A has a through-hole in its end section. The distance d1 between the through-hole of the left contact 10L and the through-hole of the middle contact 10M is equal to the distance d1 between the through-hole of the middle contact 10M and the through-hole of the right contact 10R.

[0035] Therefore, the distance d1 between the through-holes of busbar rails 2 is chosen to be equal to the distance d1 between the through-holes of contacts 10, ensuring alignment. To establish an electrical connection, busbar rails 2 of current collecting device S1 and contacts 10 of contactor 16A are positioned one above the other, with the through-holes correspondingly overlapping. Using connecting bolts 20 inserted through the aligned through-holes and corresponding nuts, busbar rails 2 of current collecting device S1 are pressed against electrical contacts 10 of contactor 16A, ensuring a secure electrical connection. In the practical example, e1 = d1 = 37 mm.

[0036] Figure 2 A conventional current collecting device S2 of a second larger structural size is shown, which is electrically conductively connected to a contactor 16B of a second larger structural size by means of a rail connection. Figure 1 The description applies similarly to Figure 2 Only the distances e2 and d2 between the busbar rail, electrical contacts and through-holes are greater than Figure 1 The distance in the figure is because it involves two different structural sizes 16A and 16B of the contactor. In the practical example, it is e2 = d2 = 48 mm.

[0037] Figure 3 A set of conventional busbar rails 2 for a three-phase current collection device is shown. These three busbar rails 2 are identical, except for the unimportant auxiliary opening 14 and the second through-hole 12; any busbar rail 2 can be installed at any location in the current collection device. Transversely to the longitudinal center axis 4, the busbar rail 2 has a rectangular profile with two narrow sides 2.2, 2.4 and two broad sides 2.1, 2.3. Along its longitudinal center axis 4, the busbar rail 2 has a top end 6K and a bottom end 6F.

[0038] Accordingly, a first through-hole 8 for guiding the connecting bolt is provided in the top end 6K of the busbar guide 2. The center of the first through-hole 8 is correspondingly located on the longitudinal center axis 4 of the busbar guide 2, so that when the busbar guide 2 is turned around the longitudinal center axis 4, the orientation of the first through-hole 8 relative to the longitudinal center axis 4 remains unchanged.

[0039] Accordingly, a second through hole 12 for guiding the connecting bolt is provided in the bottom end 6F of the busbar rail 2. The center of the second through hole 12 is correspondingly located on the longitudinal center axis 4 of the busbar rail 2, so that when the busbar rail 2 is turned around the longitudinal center axis 4, the orientation of the second through hole 12 with respect to the longitudinal center axis 4 remains unchanged.

[0040] exist Figure 3 In the embodiment of the present invention, the second through-holes 12 of the two outer busbar rails 2 are correspondingly designed as longitudinal holes, wherein the length of the longitudinal holes extends at right angles to the longitudinal center axis 4. The design as longitudinal holes offers the following advantages when using cable glands: in this way, the required voltage spacing can be maintained. Furthermore, in this way there is a certain leeway (assembly tolerance) so that the busbar rails 2 or the cable glands can be aligned better with one another.

[0041] Figures 4 to 6 This illustrates the difference from the prior art (contactors are available in different sizes). The current collecting device S12 according to the present invention is available in only one size, wherein adaptation to the different sizes of the contactors is accomplished via busbar rails. Due to the non-central, i.e., eccentric, position of the through-holes in the left and right busbar rails, and depending on the tilting of the left and right busbar rails (eccentric positions of the through-holes moving away from or towards each other), the contactor and the current collecting device can be electrically connected via the busbar rails.

[0042] Figure 4 A set of busbar rails 2L, 2M, 2R according to the present invention is shown. Figure 3 The difference of the conventional busbar guide 2 shown in FIG is that the two busbar guides 2L, 2R for the outer phases pass through the first through-hole 8 at an eccentric position different from the middle busbar guide 2M. For the description of the auxiliary opening 14 and the second through-hole 12, please refer to the description of the auxiliary opening 14 and the second through-hole 12. Figure 3 Description.

[0043] The center of the first through-hole 8 of the middle busbar rail 2M is located on its longitudinal center axis 4 , so that when the middle busbar rail 2M is turned around the longitudinal center axis 4 , the orientation of the first through-hole 8 relative to the longitudinal center axis 4 remains unchanged.

[0044] The first through-holes 8 of the outer busbar rails 2L, 2R, i.e. the left busbar rail 2L and the right busbar rail 2R, are respectively located at the same distance d relative to their longitudinal center axes 4, so that when the outer busbar rails 2L, 2R are flipped around their respective longitudinal center axes 4, the orientations of the first through-holes 8 with respect to their respective longitudinal center axes 4 are mirrored.

[0045] The left-hand busbar rail 2L and the right-hand busbar rail 2R are identical: the left-hand busbar rail 2L is transformed into the right-hand busbar rail 2R by being turned around its longitudinal center axis 4 , and vice versa.

[0046] The left-hand busbar rail 2L and the right-hand busbar rail 2R each have projections 30 at their bottom ends 6F on both narrow sides 2.2 and 2.4, respectively. The narrow sides of the center busbar rail 2M are straight, i.e., without projections. The projections 30 are provided at the bottom ends 6F of the outer busbar rails 2L and 2R to ensure a sufficiently large contact surface between the longitudinal holes 12 in the two wide sides 2.1 and 2.3 and the edges of the wide sides 2.1 and 2.3. The longitudinal holes 12 allow for displacement of the outer busbar rails 2L and 2R or the cable glands, thereby increasing the contact surface necessary to provide a sufficient current contact surface in any assembly situation. This design of projections 30 is optional; the outer busbar rails 2L and 2R could also be straight, i.e., without projections.

[0047] Figure 5 The current collecting device S12 is shown connected to a contactor 16A having a first smaller overall size. Here, the left-hand busbar 2L and the right-hand busbar 2R are fixed in the housing 22 of the current collecting device S12 so that their eccentrically positioned through-holes are oriented toward one another. This ensures that the distance d1 between the through-holes 8 of the busbar rails 2 is smaller than the distance e12 between the longitudinal center axes of the busbar rails 2 at their exit point from the housing 22. The distance d1 between the through-holes 8 of the busbar rails 2 corresponds exactly to the distance d1 between the through-holes of the contacts 10 of the contactor 16A having the first smaller overall size.

[0048] Figure 6 Shown with Figure 5 The same current collecting device S12 is used, but here it is connected to a contactor of the second, larger size. This is achieved by attaching the left-hand busbar rail 2L and the right-hand busbar rail 2R to the housing 22 of the current collecting device S12 so that their eccentrically positioned through-holes are oriented away from one another. This ensures that the distance d2 between the through-holes 8 of the busbar rails 2 is greater than the distance e12 between the longitudinal center axes of the busbar rails 2 at their exit point from the housing 22. The distance d2 between the through-holes 8 of the busbar rails 2 corresponds exactly to the distance d2 between the through-holes of the contacts 10 of the contactor 16A of the second, larger size.

[0049] In an exemplary embodiment, d1 =37 mm, d2 =48 mm, and e12 =1 / 2x(d1+d2)=42.5 mm.

[0050] Figure 7 Shown separately Figure 5 The current acquisition device S12 has no contactor. Figure 8 Shown separately Figure 6 As can be seen from the two figures, the housing 22 of the current collecting device S12 is identical in the two designs, and only the orientation of the left busbar rail 2L and the right busbar rail 2R differs. Figure 7 and Figure 8 Likewise shown is an electrical contact 10 which is not provided for connection to a contactor having a different structural size and is therefore not adapted to a corresponding dimension; its design is therefore irrelevant to the present invention.

[0051] Figures 9 to 13 The housing 22 of the current sensing device S12 is shown in different views. Figure 9 The front side 22 . 1 of the housing 22 is shown. Figure 10 The top side 22 . 2 of the housing is shown, wherein first openings 26 are provided on the top side 22 . 2 , with the first openings 26 comprising a left-hand first opening 26L, a middle first opening 26M and a right-hand first opening 26R. Figure 4 The busbar rail 2 in the housing is inserted into the first opening 26 of the housing 22 and fixed in the housing (for example by screwing). Figure 11 The rear side 22 . 3 of the housing 22 is shown; a support rail fastening is fixed there, by means of which the current sensing device S12 can be clipped onto a support rail, for example a top hat rail or a DIN rail. Figure 12 The bottom side 22 . 4 of the housing 22 is shown. Figure 13 The right side 22R of the housing 22 is shown.

[0052] Figure 14 The bottom end 6F of the busbar rail 2 is shown. The busbar rail 2 has a rectangular cross-section and comprises two opposite broad sides 2.1, 2.3, two opposite narrow sides 2.2, 2.4, and an end face 2.5. The longitudinal center axis 4 extends through the interior of the busbar rail 2. A second through-hole 8' extends through the interior of the busbar rail 2 in the region of the bottom end 6F of the first broad side 2.1 to the opposite broad side 2.3.

[0053] Figure 15 The diagram shows the connection between current collection device S12 and contactors 16A and 16B. Main circuit 48 includes three phase conductors L1, L2, and L3, a neutral conductor N, and a ground conductor PE. A motor feeder 52 branches from the three phase conductors L1, L2, and L3 of main circuit 48, delivering electrical energy from main circuit 48 to motor 50 via motor feeder 52.

[0054] The three phases L1, L2, and L3 of the motor feeder 52 are connected to the input terminals of contactors 16A and 16B of any size. A current sensor S12 is connected in series with the contactors 16A and 16B, with the electrical output contacts 10 of the contactors 16A and 16B connected to the busbar 2 of the current sensor S12. In this case, the current sensor S12 is connected to the motor feeder 52 downstream of the contactors 16A and 16B, as viewed in the direction of energy supply to the motor 50. The motor feeder 52 extends from the output terminals of the current sensor S12 to the motor 50.

[0055] The current measurement value acquired by current acquisition device S12 is transmitted via first data line 44 of control circuit 42 to control device 40, where it is further processed. Control device 40 checks whether the current measurement value, or a current variable derived therefrom, is within a normal value range or an abnormal value range. The latter is referred to as a fault condition and can occur in the event of an overload or short circuit. In this fault condition, control device 40 sends a trigger signal to contactors 16A and 16B via second data line 46 of control circuit 42. This trigger signal causes contactors 16A and 16B to interrupt motor feeder 52.

[0056] Reference Signs List

[0057] 2 busbar rails

[0058] 2.1 Broadside

[0059] 2.2 Narrow side

[0060] 2.3 Broadside

[0061] 2.4 Narrow side

[0062] 2.5 End face

[0063] 2L Left busbar rail

[0064] 2M middle busbar rail

[0065] 2R right busbar rail

[0066] 4 Longitudinal center axis

[0067] 6F bottom

[0068] 6K Top

[0069] 8 The first via at 6K

[0070] 8' Second via at 6F

[0071] 10 electrical contacts

[0072] 10L Electrical contacts on the left side

[0073] 10M Middle electrical contact

[0074] 10R electrical contacts on the right side

[0075] 12 Via at 6F

[0076] 14 Auxiliary opening

[0077] 16A contactor of the first size

[0078] 16B contactor of the second structural size

[0079] 18 rail system

[0080] 20 connecting bolts

[0081] 22 housing

[0082] 22.1 Front

[0083] 22.2 Top surface

[0084] 22.3 Back

[0085] 22.4 Bottom

[0086] 22L Left side of 22

[0087] 22R 22 right side

[0088] 24 Load rail fixings

[0089] 26 First Opening

[0090] 26L First opening on the left

[0091] 26M The first opening in the middle

[0092] 26R First opening on the right

[0093] 28 Second Opening

[0094] 30 protrusion

[0095] 36 housing

[0096] 40 Control Equipment

[0097] 42 Control Circuit

[0098] 44 First data line

[0099] 46 Second data line

[0100] 48 Main Circuit

[0101] 50 motor

[0102] 52 Motor feeder

[0103] d1 8 first distance

[0104] d2 8 second distance

[0105] The first distance of e1 2

[0106] e2 2's second distance

[0107] e12 2 uniform distance

[0108] L1 phase

[0109] L2 phase

[0110] L3 phase

[0111] N Neutral conductor

[0112] PE Land

[0113] S1 Current acquisition device of the first size

[0114] S2 second size current acquisition device

[0115] S12 current acquisition device with unified structure and size

Claims

1. A set of busbar rails (2L, 2M, 2R) for a current collection device, the set of busbar rails comprising a left busbar rail (2L), a middle busbar rail (2M), and a right busbar rail (2R), each having a top end (6K) and a bottom end (6F) along its longitudinal center axis (4), and each having a first through hole (8) at its top end (6K) for guiding a connecting bolt through. in, The center of the first through hole (8) of the middle busbar guide rail (2M) is located on its longitudinal center axis (4), so that when the middle busbar guide rail is turned around the longitudinal center axis (4), the orientation of the first through hole (8) with respect to the longitudinal center axis (4) remains unchanged, and The first through hole (8) of the left busbar guide rail (2L) and the first through hole (8) of the right busbar guide rail (2R) are respectively located at the same distance d relative to their longitudinal center axis (4), so that when the busbar guide rails (2L, 2R) are flipped around the corresponding longitudinal center axis (4), the orientation of the first through hole (8) with respect to the corresponding longitudinal center axis (4) is mirrored.

2. A set of busbar rails (2L, 2M, 2R) according to claim 1, in, The busbar rails (2L, 2M, 2R) have a rectangular profile transversely to the longitudinal center axis (4), the rectangular profile having two narrow sides (2.2, 2.4) and two broad sides (2.1, 2.3), The left busbar rail (2L) and the right busbar rail (2R) are each bent at the top end (6K), so that the narrow side in the region of the top end (6K) is displaced relative to the narrow side in the region of the bottom end (6F). The left and right busbar rails (2L, 2R) are bent toward each other or away from each other.

3. A set of busbar rails (2L, 2M, 2R) according to any one of the preceding claims, in, The busbar guide rails (2L, 2M, 2R) are respectively provided with a second through hole (8') at their bottom end (6F) for guiding the connection bolts to pass through. The center of the second through hole (8') is located on the corresponding longitudinal center axis (4), so that when the busbar guide rail is flipped around the corresponding longitudinal center axis (4), the orientation of the second through hole (8) relative to the corresponding longitudinal center axis (4) remains unchanged.

4. A current collection device comprising a set of busbar rails (2L, 2M, 2R) according to any one of the preceding claims, in, The current collection device includes a shell having a front face, and includes three first openings arranged in a straight line in the shell, namely, a first opening on the left side, a first opening in the middle, and a first opening on the right side. The three first openings are used to insert busbar guides. The corresponding busbar guides, namely, the busbar guide on the left side, the busbar guide in the middle, and the busbar guide on the right side, are respectively inserted into the three first openings with their bottom ends (6F), thereby being fixed inside the shell. The two first openings on the outside have an equal distance e12 relative to the first opening in the middle. The busbar rails extend from the housing at their respective top ends (6K), wherein the first through holes (8) point in the direction of the front face. The left busbar guide rail (2L) and the right busbar guide rail (2R) can be respectively inserted into the corresponding first opening in a manner of flipping around the corresponding longitudinal center axis (4) in steps of 180 degrees. wherein, when the left busbar rail (2L) and the right busbar rail are inserted into their respective first openings so that their first through holes (8) are displaced toward each other, the first through hole (8) of the left busbar rail (2L) and the first through hole (8) of the right busbar rail respectively have the same smaller distance d1 relative to the first through hole (8) of the middle busbar rail (2M), and When the left busbar rail (2L) and the right busbar rail are inserted into their respective first openings so that their first through holes (8) are displaced away from each other, the first through hole (8) of the left busbar rail (2L) and the first through hole (8) of the right busbar rail have the same larger distance d2 relative to the first through hole (8) of the middle busbar rail (2M).

5. The current collection device according to claim 4, comprising a set of busbar rails (2L, 2M, 2R) according to claim 3, in, The busbar rails are fixed at their bottom ends (6F) inside the housing by means of second through holes (8').

6. A combination of a contactor (16A, 16B) and a current collection device (S12) according to claim 4 or 5, in, The busbar rails (2L, 2M, 2R) of the current collection device (S12) are connected to the electrical contacts (10) of the contactors (16A, 16B). The contactors (16A, 16B) are available in any of two structural sizes, and The left busbar rail (2L) and the right busbar rail of the current collection device (S12) are inserted into their corresponding first openings according to the structural dimensions of the contactors (16A, 16B), so that their first through holes (8) are shifted toward or away from each other.

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