Busbar connector

Abstract

The invention relates to a busbar connector with shock hazard protection for releasably connecting, in a high-current-conducting manner, two high-current busbars spaced apart from one another in different planes, comprising: - a plug part (13), which can be fastened to a contact portion of the one, first high-current busbar, and a bushing part (14), which can be fastened to a contact portion of the other, second high-current busbar and has a receptacle for the plug part (13), wherein the plug part (13) and the bushing part (14) can be brought into a plugged position by inserting the plug part (13) into the receptacle of the bushing part (14), in which plugged position an electric contact surface of the plug part (13) and an electric contact surface of the bushing part (14) rest against one another in a conductive manner, - a high-current-conducting current conduction sleeve (15), via which, in the plugged position, electric current can be conducted from the one to the other high-current busbar and which is laterally surrounded by an electrically insulating shock hazard protection of the busbar connector, and - an elongate fastening means (16) which, in the plugged position, extends through the current conduction sleeve (15), for releasably fixing the plug part (13) and the bushing part (14) in their plugged position.

Description

[0001] Busbar connectors

[0002] The present invention relates to a busbar connector with touch protection for the detachable, high-current-conducting connection of two high-current rails arranged at a distance from one another in different levels, as well as a plug part and also a socket part for a busbar connector.

[0003] With the growing importance of hybrid and electric vehicles and new components and interrelations in the electrified powertrain, the need to securely connect high-current rails within the vehicle is growing. Detachability of such a connection is desirable for assembly and / or disassembly purposes. Due to the high currents involved, particularly stringent safety requirements are placed on corresponding connectors for high-current rails. For example, contact elements of the connector must generally be protected against contact by a human finger. At the same time, the space available for busbar connectors in electric vehicles is often very limited. Particular difficulties arise when the high-current rails to be connected are not located opposite one another in the same plane, but are arranged on different planes.

[0004] It is an object of the present invention to provide a busbar connector which makes it possible to connect two high-current rails arranged in different levels in a detachable and as secure a manner as possible.

[0005] This object is achieved according to the invention by a busbar connector with contact protection for the detachable, high-current-conducting connection of two high-current rails arranged at a distance from one another in different planes, comprising: - a plug part which can be fastened to a contact section of the one, first high-current rail, and a socket part which can be fastened to a contact section of the other, second high-current rail and has a receptacle for the plug part, wherein the plug part and the socket part can be brought into a plug-in position by inserting the plug part into the receptacle of the socket part, in which an electrical contact surface of the plug part and an electrical contact surface of the socket part are in conductive contact with one another,

[0006] - a high-current conducting sleeve, through which electrical current can be conducted from one high-current rail to the other in the plug-in position and which is laterally surrounded by an electrically insulating contact protection of the busbar connector, and

[0007] - an elongated fastening means extending through the current-conducting sleeve in the plug-in position for releasably fixing the plug part and the socket part in their plug-in position.

[0008] Furthermore, the object is achieved according to the invention by a plug part of the busbar connector according to the invention, wherein the plug part can be fastened to a contact section of the first high-current rail, wherein the plug part and a socket part can be brought into a plug-in position by inserting the plug part into the receptacle of the socket part, in which position an electrical contact surface of the plug part and an electrical contact surface of the socket part can be conductively applied to one another.

[0009] Furthermore, the object is achieved according to the invention by a socket part of the busbar connector according to the invention, wherein the socket part can be fastened to a contact section of the other, second high-current rail and has a receptacle for a plug part, wherein the plug part and the socket part can be brought into a plug-in position by inserting the plug part into the receptacle of the socket part, in which an electrical contact surface of the plug part and an electrical contact surface of the socket part can be conductively applied to one another.

[0010] The busbar connector according to the invention accordingly comprises a plug part that is particularly releasably attachable to (or is attached to) a terminal contact section of one, first (particularly rigid) high-current busbar. Furthermore, the busbar connector comprises a socket part that is particularly releasably attachable to (or attached to) a terminal contact section of the other, second (particularly rigid) high-current busbar and has a receptacle for the plug part. According to the invention, the plug part and the socket part can be brought into a plugged-in position by inserting the plug part into the receptacle of the socket part, in which position an electrical contact surface of the plug part and an electrical contact surface of the socket part are in electrically conductive contact with one another.This insertion can conveniently be carried out from a non-plug-in position in which the electrical contact surface of the plug part and the electrical contact surface of the socket part are in non-conductive contact with each other.

[0011] The busbar connector further comprises a high-current conducting current conducting sleeve, via which, in the aforementioned plug-in position, electrical (high) current can be conducted from one high-current busbar to the other. For safety reasons, the current conducting sleeve is laterally surrounded by an electrically insulating contact guard of the busbar connector, in particular made of plastic. The contact guard can, for example, be a plastic wall formed as a coating of the current conducting sleeve, in particular a coating applied to the current conducting sleeve by overmolding or by injection molding. The high-current conducting current conducting sleeve is preferably formed in one piece. In the case of a one-piece current conducting sleeve, the same is formed in one piece from the current conducting sleeve and the electrically insulating contact guard, preferably formed as a coating.In a preferred embodiment, the plastic wall formed by overmolding or injection molding as electrically insulating contact protection, for example in the form of a plastic sleeve, and the high-current conducting current conducting sleeve form the one-piece current conducting sleeve.

[0012] Finally, the busbar connector comprises an elongated fastening means extending through the current-conducting sleeve in the plug-in position for releasably, preferably force-fitting, fixing the plug part and the socket part in their plug-in position, in particular a screw.

[0013] By using such a plug part to which the first high-current busbar can be attached, such a socket part to which the second high-current busbar can be attached, such a current-conducting sleeve surrounded by a touch guard, and such a fastening means extending through the sleeve, high-current busbars running in different planes can be releasably connected to one another in a secure manner and – with an appropriate design of the current-conducting sleeve – with virtually no electrical loss. The current-conducting sleeve transmits the high current between the two high-current busbars, and the fastening means fixes the plug part and the socket part in the plugged-in position and preferably prevents at least relative movement in the axial direction of the fastening means.

[0014] According to a first embodiment of the invention, the current-conducting sleeve can preferably be a component of the plug part. Alternatively, it is also theoretically conceivable to integrate the current-conducting sleeve into the socket part or to form it as a component of the socket part.

[0015] Further preferably, the plug part and / or the socket part can each have at least one contact protection made of electrically insulating material, in particular a contact protection which, in a non-plugged position in which the plug part is not plugged into the socket part, ensures that the electrical contact surface of the plug part or the electrical contact surface of the socket part cannot be touched by a standard-compliant test finger and / or a user's finger.

[0016] In this case, the contact protection of the socket part can comprise an inner, preferably centrally arranged in the receptacle of the socket part for the plug part, preferably circumferential, in particular (hollow) cylindrical contact protection wall, which is arranged at a distance, preferably axial distance, from the contact surface of the socket part, in particular on the side of the contact surface of the socket part facing the plug part.

[0017] Furthermore, it can be provided that this inner wall of the contact protection of the socket part is surrounded by a circumferential, outer wall of the receptacle for the plug part, forming a gap between them, in particular with a radial spacing. This is in particular with a preferably axial spacing that is selected so small that, in the non-plugged position, a standardized test finger and / or a user's finger cannot touch the contact surface of the socket part through the gap, in particular on the side of the centrally arranged contact protection wall facing away from the plug part.It can be provided that the inner contact protection wall surrounds and / or delimits a channel through which the elongated fastening means extends in the plug-in position, in particular a channel whose inside diameter is selected to be so small that in the non-plug-in position a standard-compliant test finger and / or a user's finger cannot touch the contact surface of the socket part, which is arranged in particular on the side of the centrally arranged contact protection wall facing away from the plug part.

[0018] The plug part can further be designed such that it can be inserted into the receptacle for the plug part with a front section while the inner wall of the contact protection of the socket part is immersed in one or more matching recesses in the front section of the plug part.

[0019] Furthermore, the contact protection of the plug part can comprise at least two walls which run at a particular radial distance from one another, forming an intermediate space between them, wherein the contact surface of the plug part is then arranged axially recessed in the intermediate space, so that in the non-plugged position the free end edges of the walls protrude axially relative to the contact surface.

[0020] In this case, the radial distance between the two walls can be selected in such a way that in the non-plug-in position, a standard-compliant test finger and / or a user's finger cannot touch the axially recessed contact surface of the plug part through the gap.

[0021] The electrical contact surface of the socket part can rest electrically conductively on the current-conducting sleeve in the plug-in position and / or the electrical contact surface of the socket part can be formed by a contact piece of the high-current rail, in particular by an electrically conductive, preferably disc-like, contact piece, in particular made of the same material or connected electrically conductively to the second high-current rail.

[0022] The socket part and / or the receptacle of the socket part for the plug part can preferably be a plastic part, in particular an injection-molded plastic part.

[0023] Furthermore, it can be provided that the socket part and / or the plug part can be fastened to the contact section of the high-current rail by means of a positive and / or non-positive connection.

[0024] As far as the plug part is concerned, it can be provided that it has a receiving part, in particular designed as a preferably injection-molded plastic part, into which the contact section of the high-current rail can be inserted, as well as a separate housing part, in particular also designed as a preferably injection-molded plastic part, which is preferably releasably attached to the receiving part. This is preferably done by means of one or more locking means, in particular by means of one or more retaining clips arranged on one or both of these two components, namely the housing part and / or the receiving part, which each interact with a corresponding locking means counterpart arranged on the other component.

[0025] The elongated fastening means can also have two free ends, of which, in the plug-in position, a first end is arranged in the plug part, preferably in the housing part, in particular with a frictional engagement with the contact section of the high-current busbar. The second end can in particular be frictionally connected, preferably screwed, to a contact piece of the second high-current busbar. In particular, to a contact piece forming the electrical contact surface of the socket part, in particular a disc-like contact piece, preferably integrally connected to the second high-current busbar or electrically connected by a material bond.

[0026] In the plug-in position, the elongated fastening means can also be guided through a channel of the plug part, the free end of which is limited and / or formed by the inner, preferably (hollow) cylindrical wall of the contact protection of the plug part.

[0027] As far as the current conducting sleeve is concerned, this can be connected to at least a partial section in a

[0028] Interior of the receiving part of the plug part, in particular in an interior of a preferably hollow cylindrical section of the receiving part.

[0029] The current-conducting sleeve can also be detachably fastened to the receiving part, in particular to the preferably hollow-cylindrical section thereof, preferably by means of one or more locking means, particularly preferably by means of one or more retaining clips arranged on one or both of these two components, namely the receiving part and / or the current-conducting sleeve, which each interact with a corresponding locking means counterpart arranged on the respective other component.

[0030] As far as the contact protection surrounding the current conducting sleeve on the side is concerned, this can be formed by a plastic sleeve manufactured by overmolding the current conducting sleeve, which also forms the two walls of the contact protection of the plug part, which run at a distance from one another.

[0031] Furthermore, it can be provided that the first end of the elongate fastening means arranged in the plug part rests force-fittingly against the contact section of the first high-current rail under prestress preferably applied by a spring. This is particularly the case under a prestress which, when the busbar connector is transferred from the plug-in position to a non-plug-in position, exerts a force on the first end of the fastening means, moving said force away from the contact section; preferably in such a way that the second end of the elongate fastening means is moved into the free end of the channel of the plug part. This is particularly the case to such an extent that, in the non-plug-in position, a standard-compliant test finger and / or a user's finger cannot touch the second end of the elongate fastening means through the channel.Thus, the preload preferably applied by a spring ensures that current conducted through the high-current rail cannot be transmitted via the fastening means to a standard test finger and / or a user's finger, as the fastening means is moved into the channel of the plug part as soon as the fastening means loses the connection to the second high-current rail.

[0032] The elongated fastening means can further be guided through a preferably cylindrical channel running centrally in the interior of the receiving part and / or centrally in the interior of the current-conducting sleeve.

[0033] In a preferred embodiment of the busbar connector, the plug part and / or the socket part each have at least one contact guard made of electrically insulating material, wherein the contact guard, which in a non-mating position in which the plug part is not plugged into the socket part, ensures that the electrical contact surface of the plug part or the electrical contact surface of the socket part cannot be touched by a standard-compliant test finger and / or a user's finger, wherein the contact guard of the plug part comprises at least two walls which preferably run at a radial distance from one another, forming an intermediate space which is formed by the walls which preferably run at a radial distance from one another, wherein the contact surface of the plug part is arranged axially set back in the intermediate space, so that in the non-mating position the free end edges of the walls protrude axially relative to the contact surface.

[0034] Further features of the present invention emerge from the appended claims, from the following description of a preferred embodiment and from the appended drawings.

[0035] It shows:

[0036] Fig. 1 shows an exploded view of a busbar connector according to the invention with a plug part and a socket part,

[0037] Fig. 2 is a plan view of the busbar connector from Fig. 1,

[0038] Fig. 3 shows a section through the busbar connector from Fig. 1 along the section line C- C in Fig. 2,

[0039] Fig. 4 is a plan view of the socket part of the busbar connector from Fig. 1 and a test finger for testing a contact protection of the socket part, Fig. 5 is a section through the socket part and the test finger along the section line AA in Fig. 4,

[0040] Fig. 6 is a bottom view of the plug part of the busbar connector from Fig. 1 and a test finger for testing a contact protection of the plug part,

[0041] Fig. 7 shows a section through the plug part and the test finger along the section line BB in Fig. 6.

[0042] The drawings show a busbar connector 10 according to the invention, which detachably and conducts high currents between a first (upper) metallic high-current busbar 11 and a second (lower) metallic high-current busbar 12. The two high-current busbars 11, 12 are arranged at a distance from each other in different, parallel planes.

[0043] The busbar connector 10 has a multi-part plug part 13, which is fastened or can be fastened to the first high-current busbar 11, namely to a contact section 11a thereof, in this case a terminal contact section. It also has a socket part 14, which is fastened or can be fastened to the second high-current busbar 12, namely to a contact section 12a thereof, in this case also a terminal contact section.

[0044] The plug part 13 has a receiving part 20, preferably made of plastic, with a receiving space 20a that is open at the top, to which a separate housing part 21 of the plug part 13, which closes the receiving space 20a at the top and is preferably also made of plastic, can be detachably connected or fastened, for example by means of locking means 22a, such as holding clips, and corresponding locking means counterparts 22b.

[0045] When the receiving part 20 and the housing part 21 are not connected, the first high-current rail 11, namely its contact section 11a, can be inserted into the receiving space 20a of the plug part 13 to fasten the plug part 13 to the first high-current rail 11. The housing part 21 is then fastened to the receiving part 20 so that the contact section 11a is located in the plug part 13.

[0046] The socket part 14 of the busbar connector 10 in the present case has a sleeve part 23, which is also preferably designed as an injection-molded part made of plastic, which in the present case sits on the disc-like contact piece 18 of the second high-current rail 12 and has a receptacle 19 for the plug part 13, into which the plug part 13, namely a front end thereof, can be inserted for the electrically conductive connection of the plug part 13 and the socket part 14.

[0047] In this case, the disc-like contact piece 18 of the second high-current rail 12 can, for example, be connected to the rest of the high-current rail 12 in a uniform material and / or be electrically connected to it in a materially bonded manner, for example by welding.

[0048] The plug part 13 and the socket part 14 can be transferred from a non-plug-in position, in which the two high-current rails 11, 12 are not electrically connected to one another, see for example Figs. 5 and 7, into a plug-in position, see Fig. 3, in which high current can flow via the busbar connector 10 from one high-current rail 11, 12 to the other high-current rail 11, 12.

[0049] The current flow occurs via a particularly metallic, high-current-conducting current-conducting sleeve 15, which is arranged between the high-current rails 11 and 12, respectively, and is electrically connected thereto. In this case, it is an integral part of the plug part 13. However, it is also conceivable to integrate the current-conducting sleeve 15 into the socket part 14.

[0050] The current-conducting sleeve 15, or its outer side, is laterally surrounded by a plastic sleeve 24 forming a coating for the current-conducting sleeve 15, which was manufactured by overmolding the current-conducting sleeve 15. The current-conducting sleeve 15, together with the plastic sleeve 24, is detachably connected to the receiving part 20 of the plug part 13 via locking means 25a (retaining clips) and corresponding locking means counterparts 25b, and is seated with an (upper) partial section in a hollow cylindrical section 20a of the plug part 13.

[0051] As regards the current-conducting connection of the current-conducting sleeve 15 of the plug part 13 to the first high-current rail 11, in the present case a contact surface 15 a arranged at an (upper) end of the current-conducting sleeve 15 lies electrically conductively against a contact surface 11 b of the first high-current rail 11 formed by a (lower) outer side of the first high-current rail 11.

[0052] As regards the current-conducting connection of the current-conducting sleeve 15 or the plug 13 with the second high-current rail 12, in the present case a contact surface 15 b arranged at a (lower) end of the current-conducting sleeve 15 lies electrically conductively against a contact surface 12 b of the second high-current rail 12 formed by an (upper) outer side of the disc-like contact piece 18.

[0053] By means of an elongated fastening means 16, in this case a screw, the plug part 13 and the socket part 14 are releasably fixed in their plug-in position, so that no axial and / or transverse axial relative movements between the plug part 13 and the socket part 14 are possible.

[0054] The elongated fastening means 16 extends through the current-conducting sleeve 15, namely through an elongated, central, preferably cylindrical channel 17 or, if appropriate, a corresponding bore in the current-conducting sleeve 15.

[0055] A first (upper) free end 16 a of the elongated fastening means 16 (screw head) is arranged in the plug part 13, namely in the housing part 21 thereof, in particular with a force-fitting engagement with the contact section 11 a of the first high-current rail 11.

[0056] One or the second (lower) end 16 b of the elongated fastening means 16 is in the present case screwed to the contact piece 18 of the second high-current rail 12.

[0057] The contact protection of the busbar connector 10 is designed in a special way, which in particular ensures that in a non-plugged position of the plug part 13 and the socket part 14, i.e. after they have been removed from each other, for example after loosening the fastening means, a user cannot come into contact with a current-carrying component of the busbar connector 10.

[0058] The contact protection of the plug part 13 includes, among other things, the already mentioned plastic sleeve 24 which electrically insulates the current-conducting sleeve 15 of the plug part 13 at the side.

[0059] However, the plastic sleeve 24 not only provides such lateral contact protection of the plug part 13 or contact protection in the transverse axial or radial direction, but also contact protection in the axial direction, so that the contact surface 15 b of the plug part 13, which is otherwise exposed in the non-plugged position and is formed by the current-conducting sleeve 15, cannot be accidentally touched by a user's finger or by a standard-compliant test finger 26.

[0060] For this purpose, the plastic sleeve 24 has two walls which run at a (radial) distance from one another, namely an inner wall 24 a and an outer wall 24 b, which delimit an intermediate space 27, within which the (in this case essentially annular) contact surface 15 b of the current-conducting sleeve 15 or of the plug part 13 is arranged axially set back, so that in the non-plug-in position, cf. Fig. 7, the free end edges of the walls 24 a and 24 b protrude axially relative to the contact surface 15 b.

[0061] The distance between the walls 24 a and 24 b is selected such that the (test) finger 26 abuts against these end edges when penetrating the intermediate space 27, thus preventing further penetration and in particular contact with the contact surface 15 b.

[0062] The outer, circumferential wall 24 b is located in the plug-in position of the plug part

[0063] 13 and socket part 14 on the outside of a circumferential outer side of the contact piece 18 and is thus positively connected to it, see Fig. 7. In order to further prevent a user from coming into contact with the two ends 16 a and 16 b of the elongated fastening means 16 which may protrude from the channel 17 and which may also be live due to contact with the first high-current rail 11, several measures are provided.

[0064] On the one hand, the first end 16 a is arranged within the insulating (plastic) housing part 21, so that contact with the first end 16 a is excluded.

[0065] Secondly, the second end 16b of the elongated fastening means 16 is automatically moved into an end piece of the channel 17 of the plug part 13 (see Fig. 7), which is formed by a further wall 24c of the plastic sleeve 24, which extends radially further inward than the inner wall 24a. This occurs when the screw connection of the fastening means 16 to the contact piece 18 is released.

[0066] This is so far that, in the non-plugged position, a standardized test finger and / or a user's finger cannot touch the second end of the elongated fastening means through the channel 17. For this purpose, the diameter of the end piece of the channel 17 or the clear inner diameter of the circumferential wall 24c is chosen to be correspondingly small (and matched to the thickness of the test finger 26).

[0067] In order to effect this automatic movement of the second end 16 b into the end piece of the channel 17, in the plug-in position the first end 16 a of the elongate fastening means 16 rests force-fittingly against the contact section 11 a of the first high-current rail 11 under pretension applied in particular by a spring 28.

[0068] In this case, it is prestressed such that, when the plug part 13 and the socket part 14 are moved from the plug-in position to the non-plug-in position, a force is exerted on the first end 16a of the fastening means 16, which moves it away from the contact section 11a (upward), so that the second end 16b of the elongated fastening means 16 is correspondingly moved (upward) into the end piece of the channel 17. The socket part 14 also has a contact protection device, see Figs. 4 and 5.

[0069] For this purpose, the socket part 14 or the sleeve part 23 thereof has an inner, in this case central, circumferential contact protection wall 29 which is arranged in the receptacle 19 of the socket part 14 and which is arranged at an (axial) distance from the contact surface 12 b of the socket part 14 or the second high-current rail 12, specifically on the side of the contact surface 12 b facing the plug part 13.

[0070] This inner wall 29 is surrounded by a circumferential outer wall 30 of the receptacle 19 for the plug part, forming a gap 31 between them at a radial distance. This distance is also chosen to be small enough that, in the non-plugged position, a standardized test finger and / or a user's finger cannot touch the contact surface 12b through the gap 31.

[0071] The inner wall 29 also surrounds and / or delimits a channel 32 through which the elongated fastening means 16 extends in the plug-in position.

[0072] The clear diameter of this channel 32 is also selected to be so small that in the non-plugged position the test finger 26 and / or a user's finger cannot touch the contact surface 12 b through it.

[0073] List of reference symbols

[0074] 10 busbar connectors 28 spring

[0075] 11 first high-current rail 29 inner wall sleeve part

[0076] 11 a contact section 30 outer wall sleeve part

[0077] 11 b (lower) contact surface 31 gap

[0078] 12 second high-current rail 32 channel socket part

[0079] 12 a Contact section

[0080] 12 b (upper) contact surface

[0081] 13 Plug part

[0082] 14 Socket part

[0083] 15 Conductive sleeve

[0084] 15 a (upper) contact surface current conducting sleeve

[0085] 15 b (lower) contact surface current conducting sleeve

[0086] 16 elongated fastener

[0087] 16 a first end fastener

[0088] 16 b second end fastener

[0089] 17 channel connector

[0090] 18 Contact piece second high-current rail

[0091] 19 Socket part

[0092] 20 Recording part

[0093] 20 a recording room

[0094] 21 Housing part

[0095] 22 a Restraint device

[0096] 22 b locking element counterpart

[0097] 23 Sleeve part of the socket part

[0098] 24 plastic sleeve

[0099] 24 a inner wall

[0100] 24 b outer wall

[0101] 24 c additional wall

[0102] 25 a resting device

[0103] 25 b locking element counterpart

[0104] 26 test fingers

[0105] 27 space

Claims

Patent claims 1. Busbar connector with touch protection for the detachable, high-current conductive connection of two high-current rails arranged at a distance from each other in different levels, comprising: - a plug part (13) which can be fastened to a contact section of one, first high-current rail, and a socket part (14) which can be fastened to a contact section of the other, second high-current rail and has a receptacle for the plug part (13), wherein the plug part (13) and the socket part (14) can be brought into a plug-in position by inserting the plug part (13) into the receptacle of the socket part (14), in which an electrical contact surface of the plug part (13) and an electrical contact surface of the socket part (14) are in conductive contact with one another, - a high-current conducting sleeve (15) through which, in the plug-in position, electrical current can be conducted from one high-current rail to the other and which is laterally surrounded by an electrically insulating contact protection of the busbar connector, and - an elongated fastening means (16) extending through the current conducting sleeve (15) in the plug-in position for releasably fixing the plug part (13) and the socket part (14) in their plug-in position.

2. Busbar connector according to claim 1, characterized in that the current-conducting sleeve (15) is a component of the plug part (13).

3. Busbar connector according to one or more of the preceding claims, characterized in that the plug part (13) and / or the socket part (14) each have at least one contact protection made of electrically insulating material.

4. Busbar connector according to claim 3, characterized in that the plug part (13) and / or the socket part (14) each have at least one contact protection made of electrically insulating material, wherein the contact protection, which is arranged in a Non-plugging position, in which the plug part (13) is not plugged into the socket part (14), ensures that the electrical contact surface of the plug part (13) or the electrical contact surface of the socket part (14) cannot be touched by a standard test finger and / or a user's finger.

5. Busbar connector according to claim 3, characterized in that the contact protection of the socket part (14) comprises an inner contact protection wall which is arranged at a distance from the contact surface of the socket part (14).

6. Busbar connector according to claim 5, characterized in that the inner contact protection wall is surrounded at a distance by a circumferential, outer contact protection wall of the receptacle for the plug part (13), forming an intermediate space between them.

7. Busbar connector according to one or more of the preceding claims, characterized in that the inner contact protection wall surrounds and / or delimits a channel through which the elongate fastening means (16) extends in the plug-in position.

8. Busbar connector according to one or more of the preceding claims, characterized in that the plug part (13) is designed such that it can be inserted into the receptacle for the plug part (13) with a front section while immersing the inner wall of the contact protection of the socket part (14) into one or more matching recesses in the front section of the plug part (13).

9. Busbar connector according to one or more of the preceding claims, characterized in that the contact protection of the plug part (13) comprises at least two walls running at a distance from one another, forming an intermediate space between them, in which the contact surface of the plug part (13) is arranged axially set back, so that in the non-plugged position the free end edges of the walls project axially relative to the contact surface.

10. Busbar connector according to one or more of the preceding claims, characterized in that the distance between the two walls is selected such is that in the non-mating position, a standard test finger and / or a user's finger cannot touch the axially recessed contact surface of the plug part (13) through the gap.

11. Busbar connector according to one or more of the preceding claims, characterized in that the electrical contact surface of the socket part (14) in the plug-in position rests electrically conductively on the current-conducting sleeve (15), and / or that the electrical contact surface of the socket part (14) is formed by a contact piece of the high-current rail.

12. Busbar connector according to one or more of the preceding claims, characterized in that the socket part (14) and / or the receptacle of the socket part (14) for the plug part (13) is a plastic part.

13. Busbar connector according to one or more of the preceding claims, characterized in that the socket part (14) and / or the plug part (13) can be fastened to the contact section of the high-current rail by means of a positive and / or non-positive connection.

14. Busbar connector according to one or more of the preceding claims, characterized in that the plug part (13) has a receiving part (20) into which the contact section of the first high-current rail can be inserted, and a separate housing part (21) which is fastened to the receiving part (20), 15. Busbar connector according to one or more of the preceding claims, characterized in that the elongate fastening means (16) has two free ends, of which in the plug-in position a first end is arranged in the plug part (13) and a second end is connected to a contact piece of the second high-current rail.

16. Busbar connector according to one or more of the preceding claims, characterized in that the elongate fastening means (16) is guided in the plug-in position through a channel of the plug part (13), the free end of which is delimited and / or formed by the inner wall of the contact protection of the plug part (13).

17. Busbar connector according to one or more of the preceding claims, characterized in that the current-conducting sleeve (15) is seated at least with a partial section in an interior space of the receiving part (20).

18. Busbar connector according to one or more of the preceding claims, characterized in that the current-conducting sleeve (15) is detachably fastened to the receiving part (20).

19. Busbar connector according to one or more of the preceding claims, characterized in that the first end of the elongate fastening means (16) arranged in the plug part (13) rests force-fittingly against the contact section of the high-current rail under prestress.

20. Busbar connector according to one or more of the preceding claims, characterized in that the first end of the elongate fastening means (16) arranged in the plug part (13) rests force-fittingly against the contact section of the high-current rail under prestress, wherein the prestress exerts a force on the first end of the fastening means (16) when the busbar connector is transferred from the plug-in position into a or the non-plug-in position, which force moves it away from the contact section, such that the second end of the elongate fastening means (16) is moved into an end piece of the channel of the plug part (13) to such an extent that in the non-plug-in position a standard-compliant test finger and / or a user's finger cannot touch the second end of the elongate fastening means (16) through the channel.

21. Busbar connector according to one or more of the preceding claims, characterized in that the elongate fastening means (16) is guided through a channel running in the interior of the receiving part (20) and / or in the interior of the current-conducting sleeve (15).

22. Busbar connector according to one or more of the preceding claims, characterized in that the contact protection laterally surrounding the current-conducting sleeve (15) is formed by a plastic sleeve manufactured by overmolding the current-conducting sleeve (15), which also surrounds the two walls running at a distance from one another. fertilizing the contact protection of the plug part (13).

23. Socket part (14) for a busbar connector according to one or more of the preceding claims 1 to 22, wherein the socket part (14) can be fastened to a contact section of the other, second high-current rail and has a receptacle for a plug part (13), wherein the plug part (13) and the socket part (14) are connected by Inserting the plug part (13) into the receptacle of the socket part (14) can be brought into a plug-in position in which an electrical contact surface of the plug part (13) and an electrical contact surface of the socket part (14) can be conductively applied to one another.

24. Plug part (13) for a busbar connector according to one or more of the preceding claims 1 to 22, wherein the plug part (13) can be fastened to a contact section of the one first high-current rail, wherein the plug part (13) and a socket part (14) can be brought into a plug-in position by inserting the plug part (13) into the receptacle of the socket part (14), in which position an electrical contact surface of the plug part (13) and an electrical contact surface of the socket part (14) can be conductively applied to one another.

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