EP3289646B1 - Plug connection and set of plug connections - Google Patents

Description

The present invention relates to a connector which consists of a connector and a slot for inserting the connector. A first coding element with a coding pattern is arranged on the plug connector, and a second coding element with a coding pattern complementary to the coding pattern is arranged on the slot, such that the plug connector can be inserted into the slot in a plugging direction up to a coupling position, if the first Coding element and the second coding element occupy a predetermined relative position to each other,

Coded connectors are known in the art. In such connectors, a coding mechanism ensures that the connector can only be plugged into a correct slot assigned to it. In this way, it can be prevented in the presence of multiple slots that a connector can be inserted incorrectly in a slot not assigned to him, resulting in a faulty power or signal transmission result. Coded connectors are well known in the field of signal transmission to ensure that individual lines of a bundle of signal transmission lines are correctly coupled to associated receptacles. Coded connectors are also used in power transmission connectors to prevent connection errors during their installation.

A slot is understood to be any connector receptacle that is configured to be coupled to the connector so that electrical currents from the connector can be routed through the slot. Examples of slots include a stationary receptacle, a receptacle assembly with multiple receptacles, a mating connector assembly, a mating connector, which may be located at a cable end or the like.

In known coding mechanisms, the connector has a first coding element with a coding pattern, and the slot has a second coding element with a complementary coding pattern matching the coding pattern. The mating pattern may be in the form of a predetermined spatial arrangement of projections and / or recesses on the connector, which is adapted to engage with a complementary spatial arrangement of recesses and / or projections on the slot. Accordingly, the connector can be verkuppelt with the coding pattern in the plugging direction with the mating connector with the complementary coding pattern, provided that the connector and the slot are arranged relative to each other such that the coding pattern engages correctly when plugging into the complementary coding pattern.

EP2822106 A1 discloses a connector according to the preamble of claim 1.

In the coupling position contact elements of the connector and slot are in electrical contact, and the connector is in an axial end position at the slot.

In conventional coded connectors are sometimes several attempts at different relative positions of connector and slot to perform by the fitter until the first coding element engages in the correct position in the second coding element and the mating process can be performed successfully. In a plurality of connections to be verkuppelnden, eg. For coupling a cable bundle, therefore often numerous insertion tests are required. Coupling conventional connectors is therefore time consuming and cumbersome.

In view of the problems described, it is the object of the present invention to provide a simple verkuppelbare coded connector, which nevertheless reliably prevents mis-coupling.

This object is achieved by a connector according to claim 1. Advantageous developments of the invention are described in the dependent claims. Furthermore, a set of connectors according to claim 12 is provided.

In a plug-in connection according to the invention, the first coding element is held rotatably on the plug connector about a rotation axis extending parallel to the plug-in direction and / or the second coding element is held rotatably about the rotation axis on the plug-in slot. In other words, in a first embodiment according to the invention, only the first coding element is rotatably supported on the connector about an axis of rotation extending parallel to the plug-in direction; in a second embodiment, only the second coding element is rotatably held on the slot about an axis of rotation parallel to the plug-in direction; and in a third and particularly preferred embodiment of the present invention, the first and second coding elements are rotatably supported on the connector and on the slot, respectively.

The invention is based on the knowledge that in conventional plug connections from the cable installer often several relative rotational positions between connector and slot must be tested through to the Coding pattern correct position in the complementary coding pattern engages and the insertion process is made possible. Rotations of the entire slot and rotations of the connector to which a stiffening cable is regularly attached, however, are troublesome and can lead to damage to the connector. In contrast, it is sufficient in the connector according to the invention to rotate only the first and / or the second coding element such that it is aligned in the correct position with respect to. The other coding element, whereupon a plug-in operation is possible. A rotation of the main body of the connector with attached cable or a rotation of the entire slot, however, are not required according to the invention. The rotatable first coding element and / or the rotatable second coding element are preferably held on the connector or in the slot, that the coding pattern is readily recognizable by the cable fitter and / or the cable fitter is accessible for rotation. This facilitates the setting of the predetermined relative position between the connector and the slot prior to insertion and the correct selection of a connector belonging to a slot in the case of multiple connectors. In particular, the first coding element forms an outer boundary surface of the connector, is easily visible prior to insertion and / or is preferably exposed radially outward.

According to the invention, the plug-in connection has a self-aligning mechanism, by means of which the first coding element and the second coding element are automatically rotated relative to one another in the predetermined relative position when the plug-in connector is inserted. This self-alignment between the two coding elements can be effected by a relative force acting upon insertion in the plugging direction between the two coding elements. In other words, the self-aligning mechanism includes a force deflecting mechanism for converting a plug-in force directed in the plugging direction into one of the coding elements in the circumferential direction aligning torque. A plug-in connection according to the invention with Selbstausrichtmechanismus prevented due to the coding the pairing unrelated pairs of connectors and slot and eliminates at the same time failed attempts during insertion, since the correct orientation of the coding elements is done automatically.

Preferably, the contour of the connector and / or the slot in a direction perpendicular to the insertion direction cutting plane is substantially round, preferably substantially rotationally symmetrical, and in particular approximately circular. Conventional coded connectors with a round contour prepare due to the numerous plausible appearing relative rotational positions between connector and slot special plug-in problems that can be eliminated by the Selbstausrichtmechanismus invention.

In a preferred embodiment of the invention, the first coding element is a ring element revolving around a main body of the connector and rotatably held on the main body. Alternatively or additionally, the second coding element is a sleeve part rotatably held on the slot for insertion of the ring element. In this case, an outer diameter of the ring element is preferably adapted to an inner diameter of the sleeve part, so that the ring element can be inserted into the sleeve part under radial engagement of the coding pattern of the ring element in the complementary coding pattern of the sleeve part.

Conversely, in an alternative embodiment of the invention, the first coding element is a sleeve portion rotatably supported on a main body of the connector, and the second coding element is a ring member rotatably supported on the slot, which mates with the sleeve portion.

The ring member is not necessarily a circumferentially closed ring, but may also be partially annular or slotted so that it can be applied or clipped from the side of the connector. Preferably, the ring member is so in a circumferential groove of the main body of the Connector held that it is fixed in the insertion direction in the groove, but is rotatable in the circumferential direction in the groove around the main body. It can be provided with a view to a good fixation of the ring member while providing a reliable coding mechanism that the depth of the groove is adapted to a radial ring thickness of the ring member, said provided on the ring member coding pattern projects radially out of the groove.

In view of good sliding properties of the ring member relative to the main body, it is appropriate that the ring member is formed of a plastic material, wherein the groove may be incorporated into a main body made of a metal such as aluminum. In particular, the groove can be introduced into a metal outer conductor part of the connector.

Alternatively or additionally, the sleeve part is formed from a plastic material and / or rotatably attached to a socket part of the slot made of metal. Between the socket part and the sleeve part, a rotary bearing may be provided, which may be formed, for example, by a radially engaging in an annular groove annular projection.

In preferred embodiments, the ring element has the coding pattern, which is preferably formed in the form of a predetermined spatial arrangement of projections and / or grooves, and the sleeve part has the complementary coding pattern, which is preferably in the form of a negative form of the coding pattern and a complementary spatial Arrangement of projections and / or grooves. When the ring element and the sleeve part assume a predetermined relative rotational position (or one of a plurality of possible predetermined rotational positions), the coding pattern of the ring element engages in the insertion process radially into the complementary coding pattern of the sleeve part.

For this purpose, it is advantageous that the first coding pattern is in the form of preferably a plurality of radially outwardly projecting projections, and / or the second coding pattern in the form of preferably a plurality of guide grooves for inserting a respective projection is formed, or vice versa.

The projections preferably project outward in the radial direction from a ring section of the ring element. The guide grooves preferably run at least in sections along the insertion direction in the inner wall of the sleeve part, wherein the distances between respectively adjacent projections of the ring element are adapted to the distances between each adjacent guide grooves of the sleeve part.

An easily manufactured and reliable encoding mechanism can be provided by having the first coding pattern and the second coding pattern having multiple radial symmetry such as 2-fold, 3-fold, or 4-fold radial symmetry. In other words, the ring member has two preferably identically shaped protrusions at an angle of 180 °, three protrusions at an adjacent angle of 120 °, four protrusions at an adjacent angle of 90 ° or the like. on. The same applies to the introduced into the sleeve part guide. An encoding mechanism with n-fold radial symmetry offers the advantage of n predetermined relative positions, in each case an insertion process is possible. In this case, only a comparatively small relative rotation between the first and the second coding element, namely a maximum relative rotation of 360 ° / 2n required to set starting from any starting rotational position a coupling enabling predefined relative position, whereby the coupling operation can be further simplified can.

In a particularly preferred embodiment of the invention, the first coding element is a ring element with two, three or more radially projecting and circumferentially spaced from each other at a predetermined angle projections. Furthermore, the second coding element is a sleeve part with two, three or more introduced into an inner wall of the sleeve part and in Circumferential direction each spaced below the predetermined angle spaced from each other guide grooves.

A reliably acting self-alignment mechanism can be provided by at least partially reducing the width of at least one guide groove in the plug-in direction. In this case, the engaging in a wide inlet portion of the guide during insertion projection is namely guided by the tapered groove walls in the course of further insertion into a narrow groove portion, while align the coding correctly to each other, so that the connector to the coupling position in the slot is insertable.

The self-aligning mechanism can be further improved in that the at least one guide groove - and preferably all guide grooves - has an inlet section with decreasing groove width in the plugging direction and a guide section with a substantially constant groove width adjoining the inlet section in the plugging direction. In the guide portion, the groove width is preferably substantially conformed to a width of an associated projection, so that the two coding elements are substantially non-rotatably connected to each other when the projection is disposed in the guide portion - the coding pattern and the complementary coding pattern are interlocked.

Preferably, the width of the projections in the circumferential direction between 0.5 mm and 10 mm, in particular between 1 mm and 3 mm. Further, the width of the guide portions of the guide grooves in the circumferential direction is preferably between 1 mm and 11 mm, in particular between 1.5 mm and 4 mm, so that the projections fit into the guide portions with a small clearance.

The axial length of the inlet sections of the guide grooves is preferably more than 1 mm and less than 20 mm, particularly preferably between 3 mm and 10 mm. The axial length of the guide portions of the guide grooves with substantially constant groove width is preferably more than 10 mm and less than 50 mm, more preferably between 20 mm and 30 mm.

Malfunctioning of the self-aligning mechanism can be prevented by inserting n (n> 1) guide grooves into the sleeve member, with the guide grooves at the front wide end of the tapered inlet portion each covering a circumferential angular range of about 360 ° / n such that the groove walls adjacent guide grooves at the front end directly adjacent to each other or merge into each other. In this case, namely, it is ensured that the projections meet on insertion, regardless of their starting rotational position on a tapered groove wall, resulting in a relative rotation between the coding elements under a sliding of the projections on the groove walls. In particular, the guide grooves in the inlet section taper in a symmetrical manner on both sides in the direction of the respective guide section of the guide groove.

Preferably, it is provided that the second coding element has one or more abutment surfaces, each having a course component in the circumferential direction and a course component in the plug-in direction, wherein upon insertion of the connector, the first coding element abuts against the stop surface and at a relative rotation between the first and the second coding element slides. In particular, each abutment surface extends over a fraction of a full revolution substantially in the manner of a helix.

In a particularly preferred embodiment, these stop surfaces are formed by the side walls of the guide grooves in the inlet section.

According to a particularly preferred embodiment, the slot is formed in the form of a socket. In this case, the slot may have a press-fit ring for pressing into a socket part and the rotatably mounted on the press-fitting ring and sleeve-shaped projecting in the direction of the connector second coding element. The press-in ring can by press action in the likewise sleeve-shaped Socket part to be pressed and has for this purpose on the friction during pressing on improving knurling. The press-fit is held firmly after pressing on the female part, while the coding element is rotatable with respect to. The arrangement of press-fit and female part is held. Preferably, the female part has an axial dimension which allows complete reception of the second coding element inside the female part.

The connector may be configured to carry high current or alternatively to transmit signals. In the case of a high-current connector, this is preferably connected to a preferably shielded high-current cable. The connector has at least one connected to an inner conductor of the cable and preferably crimped inner conductor contact and the inner conductor contact at least partially circumferential outer conductor, which may be pressed with an outer conductor of the cable. In a preferred embodiment, the first coding element is arranged on the outer boundary surface of the outer conductor.

Preferably, the connector is configured as a permanent connection. An "unsolvable" plug-in connection is to be understood as meaning that a coupling can be done manually merely by plugging in, but decoupling is then no longer possible or only possible with the aid of a tool. For this purpose, the plug-in connection can have snap-action or latching elements which engage inseparably before or when the coupling position is reached. A coding mechanism is particularly important in a permanent connection, since incorrectly verkuppelte connectors are no longer easily decoupled.

Preferably, the connector has one or more latching projections and the slot has a circumferential latching groove for engaging the latching projections. The latching projections may be provided on a latching ring surrounding the plug connector, and the latching groove may be introduced into the inner wall of the socket part of the slot.

According to a further aspect, the present invention relates to a set of plug connections according to the invention. A "sentence" is understood to mean two, three, four or more plug-in connections according to the invention. The coding patterns and the complementary coding patterns of a first and a second connector of the set are each different from each other such that the connector of the first connector in the slot of the first connector, but not in the slot of the second connector is inserted to the coupling position.

Preferably, the connector comprises three or more plug-in connections according to the invention, the plug-in connectors of which can each be inserted in exactly one associated slot up to the coupling position.

Thus, an inventive set on several pairs of connectors and associated slots, which can be verkuppelt only due to the existing coding mechanism in each case in the correct manner. The coding pattern prevents misconnection of a connector of a first connector to a connector of a second connector. At the same time, a simple coupling is possible because the encoding elements having coding elements are rotatable so that not the entire connector or the entire slot must be rotated to arrange in the predetermined relative position. If the individual connectors additionally each have a self-aligning mechanism, a particularly simple coupling is possible because when inserting the connector of a connector in the slot of this connector, the first coding element and the second coding element are automatically rotated to each other in the predetermined relative position. Furthermore, it is apparent to the fitter immediately at the first attempt to plug in that a connector and a slot do not belong to the same connector, if no self-alignment takes place and plugging into the coupling position is therefore not possible.

An inventive set of connectors consists, for example, of three connectors for transmitting the U, V and W phases of a three-phase alternating current, for example. An electric motor, and three each one of these connectors associated slots. In this case, a correct coupling is particularly important.

Fig. 1

eine teilweise als Schnittansicht dargestellte Seitenansicht einer Ausführungsform einer erfindungsgemäßen Steckverbindung vor dem Verkuppeln,

Fig. 2

eine perspektivische Ansicht des Steckverbinders der in Fig. 1 gezeigten Steckverbindung,

Fig. 3

eine perspektivische Ansicht des Steckplatzes der in Fig. 1 gezeigten Steckverbindung, und

Fig. 4

eine Seitenansicht des in Fig. 3 gezeigten Steckplatzes.

In the following description, the invention will be explained with reference to the accompanying drawings. Show:

Fig. 1

FIG. 2 shows a side view of an embodiment of a plug connection according to the invention, partly in section, before coupling,

Fig. 2

a perspective view of the connector of in Fig. 1 shown connector,

Fig. 3

a perspective view of the slot in Fig. 1 shown connector, and

Fig. 4

a side view of the in Fig. 3 shown slot.

An inventive connector 100 of a connector 10 and a slot 50 is in Fig. 1 shown.

The connector is in Fig. 2 particularly clearly illustrated: The connector 10 is a high current connector with an inner conductor contact 22 for transmitting high current, eg. 50 A, 100 A or more. The connector 10 is connected to a cable end of a shielded high current cable 20. The shield of the high-current cable 20, usually a wire mesh, electrically contacts an outer conductor 24 of the connector 10. Between the inner conductor contact 22 and the outer conductor 24 of the connector, an insulator part 23 is arranged.

In other embodiments, the connector has no external conductor contact and / or is set up for the transmission of signals. The connector may also have more than one inner conductor contact, for example one or more differential contact pairs.

The connector 10 has a first coding element 12 in the form of a ring element 13, which rotates around a main body 11 of the connector. For this purpose, the ring element is arranged in a circumferential groove, which is introduced into the main body 11 of the connector - here in the outer conductor 24 of the connector. The ring element 13 is a slotted plastic ring, so that it can be applied on the one hand from the side of the main body 11 and on the other hand slides well in the groove.

The ring element 13 is arranged rotatably on the plug connector 10 about an axis of rotation A extending centrally through the plug connector 10 in the axial direction.

The ring element 13 has a plurality of radially outwardly projecting projections 14, through which a coding pattern is formed. The protrusions protrude out of the groove so that when they are inserted into the slot 50 they can be brought into engagement with a complementary coding pattern formed by guide grooves.

In the illustrated example, the ring member 13 a total of four projections 14 which project at an angle of 90 ° to the respective adjacent projection 14. Thus, the coding pattern has a 4-fold radial symmetry. In other embodiments, two, three or more than four projections are provided on the ring member, which may project radially symmetrically from the ring member. In other embodiments with different coding patterns, the protrusions are not radiärsymmetrisch from the ring member; Rather, not all angles between adjacent protrusions are the same. Further, the projections in the circumferential direction are not necessarily all the same width. It will be readily understood by those skilled in the art that numerous different coding patterns may be provided on the ring member 13 in this manner.

Slot 50 is in Fig. 3 illustrated particularly clearly: The slot is essentially socket-shaped or hollow cylindrical and set up for insertion of the connector 10 in the insertion direction S to a coupling position. In the coupling position, the inner conductor contact 22 of the connector 10 is in electrical contact with a mating contact (not shown) of the slot 50th

The slot 50 shown has a press-in 51, which is pressed into a socket part 53 (see Fig. 1 ). To increase the frictional engagement of this press connection, the press-fit ring or the socket part can be knurled in sections. At the press-in ring 51, a sleeve part 55 is held such that the sleeve part 55 is rotatable relative to the press-fit ring 51 and the bushing part 53 about the axis of rotation A. The Sleeve part 55 is made of plastic, while the press-fit ring and the socket part made of metal such as aluminum.

Through the sleeve part 55, a second coding element 5 2 is formed with a coding pattern complementary to the coding pattern, which is arranged rotatably on the slot 50. For this purpose, a rotation mechanism between the press-in ring 51 and the sleeve part 55 is provided.

In Fig. 3 the arrangement of Einpressring 51 and sleeve member 55 without the sleeve 53 is shown in perspective.

In other embodiments, the slot 50 may have a structure different from the structure shown in the figures. Importantly, however, the coding element 52 is complementary to the coding pattern of the connector coding pattern, which allows engagement of the two coding elements upon insertion of the connector 10, and by the insertion of a connector is prevented with an unrelated coding pattern.

In the illustrated embodiment, both the second coding element 52 is rotatably held on the slot 50 and the first coding element 12 rotatably held on the connector 10. In other embodiments, either only the first coding element or only the second coding element is rotatable.

The complementary coding pattern introduced into the second coding element 52 is particularly clear in FIG Fig. 3 illustrated: The inner wall 56 of the sleeve part has a plurality of extending in the direction of insertion S guide grooves 54 which are each adapted to engage a projection 14 of the connector 10.

The number and the respective distance of the guide grooves 54 corresponds to the number and the respective spacing of the projections 14, so that each projection 14 during Inserting the connector 10 in the sleeve member 55 can engage radially in a guide groove 54.

Each guide groove 54 has two sections: an inlet portion 62 facing the connector 10, in which the width B of the groove gradually decreases, and a guide portion 64 adjoining the inlet portion 62 in the insertion direction S, in which the width of the guide groove is substantially constant and adapted to the width of the associated projection 14.

The width B of each guide groove 54 at the front end of the inlet portion 62 corresponds to a total angular range of 90 ° or an angular range of 360 ° / n in a total of four or n guide grooves 54, so that regardless of the relative starting rotational position between the first Coding element 12 and the second coding element 52 a shrinkage of the projections 14 in each case one of the guide grooves 54 is ensured. In other words, cover all guide grooves at the front end of the sleeve part an angular range of 360 ° and then preferably taper symmetrically on both sides in the direction of the respective guide portion 64th

By this formation of the guide grooves 54, a self-aligning mechanism is provided, which ensures that upon insertion of the connector into the slot, the first coding element and the second coding element are automatically rotated in the predetermined relative position to each other.

The projections 14 namely hit when inserting the connector 10 to the tapered groove walls are formed by the abutment surfaces 68, so that in the insertion direction S directed insertion force is converted into a rotational force between the two coding elements 12, 52.

In Fig. 2 an inventive connector 10 is shown in a perspective view.

The connector 10 is arranged for permanent connection to the slot 50 and has for this purpose an annular claw member 80 with locking projections 82 for engagement in a detent recess 84 of the slot. From the Verkupplungsstellung the connector 10 is only solvable by means of a tool.

In the Figures 3 and 4 an inventive slot 50 is shown in a perspective view and in a side view.

The invention further comprises a set of plug-in connections according to the invention, each with different coding patterns and complementary coding patterns, so that each plug-in connector can only be plugged into the slot assigned to it so that no incorrect connections can occur.

The invention is not limited to the embodiments shown in the drawings. Rather, the features illustrated in the description and in the claims can be combined with each other in other ways.

Claims (13)

1. Plug connection (100), comprising a plug connector (10) with a first coding element (12) arranged thereon with a coding pattern and an insertion location (50) with a second coding element (52) arranged thereon with a coding pattern complementary to said coding pattern, wherein the plug connector (10) can be inserted, in an insertion direction (S), into the insertion location (50) as far as a coupling position, if the first coding element (12) and the second coding element (52) assume a predefined position relative to one another, characterised in that the first coding element (12) is held on the plug connector (10) so as to be rotatable around an axis of rotation (A) running parallel to the insertion direction (S) and/or the second coding element (52) is held on the insertion location (50) so as to be rotatable around the axis of rotation (A) and, characterised by a self-alignment mechanism by means of which, when plugging in the plug connector (10), the first coding element (12) and the second coding element (52) are automatically rotated into the predefined position relative to one another.
2. Plug connection according to claim 1, characterised in that the first coding element (12) is a ring element (13) surrounding a main body (11) of the plug connector, and/or the second coding element (52) is a sleeve part (55) held rotatably on the insertion location (50) so as to allow introduction of the ring element, or vice versa.
3. Plug connection according to one of the preceding claims, characterised in that the first coding pattern is in the form of preferably several radially outwardly-projecting projections (14), and/or the second coding pattern is in the form of preferably several guide grooves (54), each configured for engagement of a projection (14), or vice versa.
4. Plug connection according to claim 3, characterised in that the first coding pattern and the second coding pattern exhibit a multiple radial symmetry, for example a 2-fold, 3-fold or 4-fold radial symmetry.
5. Plug connection according to one of the preceding claims, characterised in that the first coding element (12) is a ring element (13) with two, three or more radially projecting projections (14), spaced apart from one another at a predefined angle in a circumferential direction, and that the second coding element (52) is a sleeve part (55) with two, three or more guide grooves (54) formed in an inner wall (56) of the sleeve part and spaced apart from one another in a circumferential direction at said predefined angle.
6. Plug connection according to claim 5, characterised in that a groove width (B) of at least one guide groove (54) is reduced in the insertion direction (S), at least in sections.
7. Plug connection according to claim 6, characterised in that the at least one, and preferably all the guide grooves (54) have an entry section (62) with a groove width (B) which narrows in the insertion direction (S) and a guide section (64) following on from the entry section (62) in the insertion direction with substantially constant groove width which is preferably matched to a projection width of at least one associated projection (14).
8. Plug connection according to one of the claims 5 to 7, characterised in, that n (n>1) guide grooves (54) are formed in the sleeve part (55), wherein the guide grooves, at their front end, cover a circumferential angular range of around 360%, such that the groove walls of adjacent guide grooves (54) are directly adjacent to one another at their front end (66).
9. Plug connection according to one of the preceding claims, characterised in that the second coding element (52) has a contact surface (68) with a directional component in a circumferential direction and a directional component in the insertion direction (S), wherein, on plugging in the plug connector (10), the first coding element (12) comes into contact with the contact surface (68) and slides along this, accompanied by a relative rotation between the first and the second coding elements.
10. Plug connection according to one of the preceding claims, characterised in that the insertion location (50) has a press-in ring (51) for pressing into a socket part (53) and the coding element (52), attached rotatably to the press-in ring (51) and projecting in a sleeve-formed manner in the direction of the plug connector.
11. Plug connection according to one of the preceding claims, characterised in that the plug connector (10) is a high current plug connector connected to a preferably shielded high current cable (20) with an inner conductor contact (22) and an outer conductor (24) surrounding the inner conductor contact, at least in sections, on the outer boundary surface of which the first coding element (12) is arranged.
12. Set of plug connections having a first plug connection and a second plug connection according to one of the claims 1 to 11, wherein the coding pattern and the complementary coding pattern of the first and the second plug connection in each case differ from one another such that the plug connector of the first plug connection can be plugged, as far as the coupling position, into the insertion location of the first plug connection, but not into the insertion location of the second plug connection.
13. Set according to claim 12, characterised by three or more plug connections according to one of the claims 1 to 11, the plug connectors of which can in each case only be plugged into exactly one associated insertion location.

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