EP4030561A1 - Connecting terminal for connecting an insulated conductor - Google Patents

Abstract

The invention relates to a connecting terminal (1) for connecting at least one first electrical conductor to a second electrical conductor, the connecting terminal (1) having a housing (2) with a first conductor insertion opening (11) for inserting the first electrical conductor and with a second conductor insertion opening (12) for inserting the second electrical conductor, the first and the second conductor insertion opening (11, 12) being arranged on opposite sides of the housing (2), the connecting terminal (1) having a contact insert (3, 41, 42). , which has a first clamping spring (41), a second clamping spring (42) and a busbar (3), the first and the second clamping spring (41, 42) being fastened to end regions of the busbar (3) pointing away from one another and a free space between the first and the second clamping spring (41, 42) is present, the connecting clamp (1) having an inner piece (5) as a further separate component eist, which is arranged predominantly with at least a middle section (50, 53, 54) in the free space between the first and the second clamping spring (41, 42).

Description

The invention relates to a connecting clamp for connecting at least one first electrical conductor to a second electrical conductor. The connection terminal has a housing with a first conductor insertion opening for inserting the first electrical conductor and with a second conductor insertion opening for inserting the second electrical conductor. The first and second wire insertion holes are located on opposite sides of the housing. The connecting terminal has a contact insert, which has a first clamping spring, a second clamping spring and a busbar.

Such connection terminals are known, for example from DE 10 2014 119 421 B4 .

The object of the invention is to further improve such a connection clamp.

This object is achieved by a connection clamp with the features of claim 1. The inner piece, which is present as a separate component and is inserted into the housing, adds a multifunctional component that can implement a large number of different functions with little effort, as will be explained below. The structure and the complexity of the connection terminal remain clear, since only relatively few individual parts are required. Such a connecting terminal can in particular be designed as a feed-through terminal. The spring-loaded terminal connections formed by the clamping spring and the busbar can be designed as direct plug-in connections (push-in). For example, the inner piece can fulfill certain mechanical and electrical functions, eg functions of supporting the first and/or second Clamping spring, insulation tasks, e.g. an improvement in air and creepage distances. The inner piece can, for example, take over the functions of the conductor and spring guide as well as the function of a conductor stop and also facilitate the assembly of the connection terminal.

In an advantageous embodiment, it is therefore proposed that the inner piece consists of an insulating material, e.g. of plastic. The inner piece can bear against at least one inner wall of the housing.

According to an advantageous embodiment of the invention, it is provided that the inner piece is set up for at least partially form-fitting support and/or application of a region of the first and/or second clamping spring. As a result, the contact insert is positioned and held in a stable manner in the housing. The inner piece can have a contour, at least in certain areas, which corresponds to part of the contour of the clamping spring, at least where the first and/or the second clamping spring rests on the inner piece.

Alternatively or additionally, the contact insert can also be positioned and held in the housing via form-fitting holding edges and/or latching connections.

According to an advantageous embodiment of the invention, it is provided that the contact insert forms a self-supporting structural unit with the inner piece, which can be inserted preassembled into the housing. In this way, the assembly of the connection clamp is designed to be particularly simple and time-saving.

According to an advantageous embodiment of the invention, it is provided that the first and the second clamping spring each have a clamping leg and an arcuate section, the arcuate sections of the first and the second clamping spring being arranged at a smaller distance from one another than the clamping legs in the assembled state. Accordingly, the arcuate sections of the clamping springs face each other. In this way, a compact feed-through terminal with direct plug-in connections can be produced with little effort be created on both sides. A free space can be present between the curved sections of the clamping springs.

• das Innenstück einen vom mittleren Abschnitt in Richtung der ersten Leitereinführungsöffnung abragenden ersten Fortsatz hat
  und/oder
• das Innenstück einen vom mittleren Abschnitt in Richtung der zweiten Leitereinführungsöffnung abragenden zweiten Fortsatz hat.

According to an advantageous embodiment of the invention, it is provided that

• the inner piece has a first extension protruding from the middle section in the direction of the first conductor insertion opening
  and or
• the inner piece has a second extension protruding from the middle section in the direction of the second conductor insertion opening.

The first extension can form a supporting or holding element for the first clamping spring. The second extension can form a support or holding element for the second clamping spring.

• der erste Fortsatz sich in Richtung der ersten Leitereinführungsöffnung zumindest abschnittsweise schräg zur Leitereinführungsrichtung des ersten elektrischen Leiters erstreckt
  und/oder
• der zweite Fortsatz sich in Richtung der zweiten Leitereinführungsöffnung zumindest abschnittsweise schräg zur Leitereinführungsrichtung des zweiten elektrischen Leiters erstreckt.

According to an advantageous embodiment of the invention, it is provided that

• the first extension extends in the direction of the first conductor insertion opening at least in sections obliquely to the conductor insertion direction of the first electrical conductor
  and or
• the second extension extends in the direction of the second conductor insertion opening at least in sections obliquely to the conductor insertion direction of the second electrical conductor.

As a result, a contour of the first or second extension that is well adapted to the shape of the clamping spring can be implemented, so that a good supporting effect of the clamping spring can be implemented with little effort.

• der erste Fortsatz über mindestens 50% der Längserstreckung der ersten Klemmfeder in Leitereinführungsrichtung des ersten elektrischen Leiters mit der ersten Klemmfeder überlappend ausgebildet ist
  und/oder
• der zweite Fortsatz über mindestens 50% der Längserstreckung der zweiten Klemmfeder in Leitereinführungsrichtung des zweiten elektrischen Leiters mit der zweiten Klemmfeder überlappend ausgebildet ist.

According to an advantageous embodiment of the invention, it is provided that

• the first extension is designed to overlap with the first clamping spring over at least 50% of the longitudinal extent of the first clamping spring in the conductor insertion direction of the first electrical conductor
  and or
• the second extension is designed to overlap with the second clamping spring over at least 50% of the longitudinal extent of the second clamping spring in the conductor insertion direction of the second electrical conductor.

In this way, the first and second clamping springs can be supported by the first and second extensions over a large area of their longitudinal extent.

According to an advantageous embodiment of the invention, it is provided that the housing has a main housing part which is designed as a one-piece structural unit and extends at least predominantly from the first conductor entry opening to the second conductor entry opening. As a result, the connecting clamp can be manufactured with particularly little effort and can be installed in a simple manner. The main housing part can be of relatively simple design, e.g. as a tubular component which can be provided, e.g., by cutting from an extruded profile. The main housing part can have continuous smooth walls on the inside without structuring. The main housing part can be designed, for example, as a square piece of tube without inner contours with optional rounded inner and outer longitudinal side edges. The inner piece can be completely accommodated in the main housing part and accordingly be completely surrounded by the main housing part.

According to an advantageous embodiment of the invention, it is provided that the main housing part is tubular and has a receiving space for receiving the contact insert.

• das Gehäuse wenigstens ein erstes Verschlussstück aufweist, das im Bereich der ersten Leitereinführungsöffnung in das Hauptgehäuseteil einsteckbar ist und zum Abschluss des Gehäuses im Bereich der ersten Leitereinführungsöffnung dient
  und/oder
• das Gehäuse wenigstens ein zweites Verschlussstück aufweist, das im Bereich der zweiten Leitereinführungsöffnung in das Hauptgehäuseteil einsteckbar ist und zum Abschluss des Gehäuses im Bereich der zweiten Leitereinführungsöffnung dient.

According to an advantageous embodiment of the invention, it is provided that

• the housing has at least one first closure piece, which can be inserted into the main housing part in the area of the first conductor entry opening and serves to close off the housing in the area of the first conductor entry opening
  and or
• the housing has at least one second closure piece which can be inserted into the main housing part in the region of the second conductor insertion opening and serves to close off the housing in the area of the second conductor entry opening.

In this way, the main housing part can be closed with such a closure piece either on one side or on both sides with little effort. In an alternative embodiment, the main housing part can also already be provided with a corresponding closure on one side, so that a closure piece only needs to be inserted on one side. The respective closure piece can be connected to the main housing part, for example, by latching, welding, caulking and/or gluing. The respective closure piece has a lead-through opening through which the respective electrical conductor can be guided to the contact insert in the main housing part.

The first and second closure pieces can be identical or differently shaped.

According to an advantageous embodiment of the invention, it is provided that the first closure piece has at least one protrusion protruding into the interior of the main housing part and/or the second closure piece has at least one second protrusion protruding into the interior of the main housing part. In this way, such a closure piece can also serve to support and/or apply a region of the first or second clamping spring in a form-fitting manner. The clamping spring is then supported or applied to the respective first or second projection. For example, the first projection can protrude into the arcuate section of the first clamping spring. The second projection can, for example, protrude into the arcuate section of the second clamping spring.

• der erste Vorsprung über mindestens 50% der Längserstreckung der ersten Klemmfeder in Leitereinführungsrichtung des ersten elektrischen Leiters mit der ersten Klemmfeder überlappend ausgebildet ist
  und/oder
• der zweite Vorsprung über mindestens 50% der Längserstreckung der zweiten Klemmfeder in Leitereinführungsrichtung des zweiten elektrischen Leiters mit der zweiten Klemmfeder überlappend ausgebildet ist.

According to an advantageous embodiment of the invention, it is provided that

• the first projection is designed to overlap with the first clamping spring over at least 50% of the longitudinal extent of the first clamping spring in the conductor insertion direction of the first electrical conductor
  and or
• the second projection is designed to overlap with the second clamping spring over at least 50% of the longitudinal extent of the second clamping spring in the conductor insertion direction of the second electrical conductor.

In this way, a particularly good supporting effect can be achieved for the first clamping spring on the first projection and for the second clamping spring on the second projection.

In the installed state, the first and the second projection of the closure piece can thus overlap with the extension of the inner part in the direction of longitudinal extension of the connecting clamp, so that a particularly good supporting effect of the clamping spring can be achieved.

• der erste Vorsprung am freien Ende eine konvexe Außenkontur aufweist, die an die dem ersten Vorsprung benachbarte konkave Innenkontur der ersten Klemmfeder angepasst ist
  und/oder
• der zweite Vorsprung am freien Ende eine konvexe Außenkontur aufweist, die an die dem zweiten Vorsprung benachbarte konkave Innenkontur der zweiten Klemmfeder angepasst ist.

According to an advantageous embodiment of the invention, it is provided that

• the first projection has a convex outer contour at the free end, which is adapted to the concave inner contour of the first clamping spring, which is adjacent to the first projection
  and or
• the second projection has a convex outer contour at the free end, which is adapted to the concave inner contour of the second clamping spring adjacent to the second projection.

The concave inner contour of the first clamping spring or the second clamping spring can, for example, be the inner contour of the arcuate section of the respective clamping spring. In this way, the first projection can be inserted particularly far into the first clamping spring or the second projection can be inserted particularly far into the second clamping spring.

According to an advantageous embodiment of the invention, it is provided that the first closure piece and/or the second closure piece has window-like openings arranged in opposite side walls of the closure piece. This simplifies the fixing of the first closure piece or the second closure piece in the main housing part. The window-like openings can for example, be arranged in pairs opposite each other on four side walls of the respective closure piece.

According to an advantageous embodiment of the invention, it is provided that the first clamping spring has at least two arcuate side bars, between which a clamping leg of the first clamping spring is arranged. This allows the first clamping spring to be manufactured very efficiently from a sheet metal component using stamping and bending process steps. A central area can be punched out of a rectangular sheet metal part, so that respective webs remain on the left and right of it. If necessary, this punched-out area can be shortened somewhat and can then form a clamping leg of the clamping spring. The material areas remaining laterally next to the clamping leg can form the side webs. They can be shaped by bending steps in such a way that the arcuate sections of the clamping spring are produced. In addition, a remaining transverse web that connects the side webs can be used as a holding element for holding the clamping spring on the busbar.

According to an advantageous embodiment of the invention, it is provided that the side bars and the clamping leg protrude from a common root area of the first clamping spring, the side bars being connected to one another at their ends remote from the root area via a transverse bar. The cross bar can thus be used to connect the side bars. This creates a relatively robust clamping spring arrangement which forms a closed frame around the clamping leg.

According to an advantageous embodiment of the invention, it is provided that the transverse web is arranged on the side of the busbar facing away from the clamping leg. In this way, the transverse web can be used as a fastening element for fastening the clamping spring to the conductor rail.

According to an advantageous embodiment of the invention, the first clamping spring has an edge at the free end of the root area. The edge points to a Direction that is predominantly opposite to the direction in which the clamping leg extends. The edge of the root area can bear against an inner wall of the housing, for example an inner wall of the main housing part. In this way, the clamping spring can be supported on the inner wall of the housing in the mounted state and/or under a tensile load and, if necessary, dig somewhat into this inner wall of the housing. This further improves the supporting effect and generates an increase in the pull-out forces.

The second clamping spring can be designed identically to the first clamping spring or in a different way.

According to an advantageous embodiment of the invention, it is provided that the contact insert is designed as a direct plug-in connection for directly plugging in the first and/or the second electrical conductor. With such a direct plug-in connection, a sufficiently rigid electrical conductor can be inserted directly into the terminal point, i.e. without separate actuation of the terminal leg.

According to an advantageous embodiment of the invention, it is provided that the connecting clamp is designed without an actuating element of the first and/or second clamping spring. This favors a particularly compact and slim construction of the connection clamp.

• der mittlere Abschnitt des Innenstücks im der ersten Klemmfeder zugewandten Bereich eine konkave Innenkontur aufweist, die der dem mittleren Abschnitt benachbarten konvexen Außenkontur der ersten Klemmfeder entspricht
  und/oder
• der mittlere Abschnitt des Innenstücks im der zweiten Klemmfeder zugewandten Bereich eine konkave Innenkontur aufweist, die der dem mittleren Abschnitt benachbarten konvexen Außenkontur der zweiten Klemmfeder entspricht.

According to an advantageous embodiment of the invention, it is provided that

• the middle section of the inner piece has a concave inner contour in the area facing the first clamping spring, which corresponds to the convex outer contour of the first clamping spring adjacent to the middle section
  and or
• the middle section of the inner piece has a concave inner contour in the area facing the second clamping spring, which corresponds to the convex outer contour of the second clamping spring adjacent to the middle section.

As a result, the clamping spring can also be additionally supported by the inner piece in its arcuate section, which has the convex outer contour.

According to an advantageous embodiment of the invention, it is provided that the middle section of the inner piece forms a conductor stop, which limits the insertion depth, for the first and/or second electrical conductor. This has the advantage that no additional elements are required to form a ladder stop. This functionality can be taken over directly from the inner piece. The conductor stop allows the user to feel when the first or second electrical conductor is inserted deep enough.

The object mentioned at the outset is also achieved by a connecting terminal for connecting at least one first electrical conductor to a second electrical conductor, the connecting terminal having a housing with a first conductor insertion opening for inserting the first electrical conductor and with a second conductor insertion opening for inserting the second electrical conductor , wherein the first and the second conductor insertion opening are arranged on opposite sides of the housing, wherein the connecting terminal has a contact insert which has a first clamping spring, a second clamping spring and a busbar, the first and the second clamping spring being fastened to end regions of the busbar which point away from one another are and there is a clearance between the first and the second clamping spring. Such a connecting clamp can also be advantageously combined with the features explained above.

For the purposes of the present invention, the indefinite term "a" is not to be understood as a numeral. If, for example, a component is mentioned, this is to be interpreted in the sense of "at least one component". If angles are specified in degrees, these refer to a circular measurement of 360 degrees (360°).

Figur 1

- eine Verbindungsklemme in perspektivischer Schnittansicht;

Figur 2

- ein Verschlussstück in perspektivischer Ansicht;

Figur 3

- ein Hauptgehäuseteil in perspektivischer Ansicht;

Figur 4

- das Hauptgehäuseteil mit einem Verschlussstück in perspektivischer Schnittansicht;

Figur 5

- einen Kontakteinsatz mit Innenstück in perspektivischer Ansicht;

Figur 6

- den Kontakteinsatz gemäß Figur 5 ohne das Innenstück;

Figur 7

- eine Klemmfeder in perspektivischer Ansicht;

Figur 8

- ein Innenstück in perspektivischer Ansicht;

Figur 9

- eine Stromschiene in perspektivischer Ansicht;

Figur 10

- eine weitere Ausführungsform einer Leiteranschlussklemme in perspektivischer Schnittansicht;

Figur 11

- eine weitere Ausführungsform eines Hauptgehäuseteils in perspektivischer Schnittansicht.

The invention is explained in more detail below on the basis of exemplary embodiments using drawings. Show it

figure 1

- A connecting terminal in a perspective sectional view;

figure 2

- A locking piece in perspective view;

figure 3

- A main body part in perspective view;

figure 4

- The main housing part with a closure piece in a perspective sectional view;

figure 5

- A contact insert with inner piece in perspective view;

figure 6

- according to the contact insert figure 5 without the inner piece;

figure 7

- A clamping spring in a perspective view;

figure 8

- an inner piece in perspective view;

figure 9

- A busbar in perspective view;

figure 10

- Another embodiment of a conductor terminal in a perspective sectional view;

figure 11

- Another embodiment of a main housing part in a perspective sectional view.

the figure 1 1 shows a connecting terminal 1 which has a housing 2 and a contact insert 3, 41, 42 with an inner piece 5 inserted in the housing 2. FIG. The housing 2 has a main body part 20 which is tubular with a substantially square or rectangular cross section. A first closure piece 21 and a second closure piece 22 are used as additional parts of the housing 2 at the two open ends of the main housing part 20 . In the area of the first closure piece 21, the housing 2 has a first conductor insertion opening 11, into which a first electrical conductor can be inserted in a first conductor insertion direction L1. In the area of the second closure piece 22, the housing 2 has a second conductor insertion opening 12, into which a second electrical conductor can be inserted in a second conductor insertion direction L2. The first conductor insertion direction L1 and the second conductor insertion direction L2 are preferably aligned in opposite directions.

The contact insert has a busbar 3 , a first clamping spring 41 and a second clamping spring 42 . The first and second clamping springs 41, 42 each have a root area 46. Arc-shaped side bars 48 and a clamping leg 43 protrude from the root area 46 . The side bars 48 each have an arcuate section 44 . Due to their curved shape, the side webs 48 initially extend approximately parallel to the busbar, starting from the root area 46 3 and then, after the arcuate section 44, go back into another section that extends approximately parallel to the busbar 3. The side bars 48 are connected to one another at their ends remote from the root area 46 via a transverse bar 45 . The transverse web 45 is arranged on the other side of the busbar 3 than the side webs 48 and the clamping leg 43. As a result, the respective clamping spring 41, 42 is fastened to the busbar 3. The clamping leg 43 is arranged between two arcuate side bars 48 of a clamping spring. When no electrical conductor is clamped on, the clamping leg 43 extends directly towards the busbar 3 and can bear against the busbar 3 . The free end of the clamping leg 43 has a clamping edge and, together with the busbar 3, forms a clamping point for an electrical conductor to be connected.

There is a free space between the arcuate sections 44 of the first and second clamping springs 41, 42 which face one another. This free space is at least partially filled by areas of the inner piece 5. In particular, a middle area 50, 53, 54 of the inner piece 5 is arranged between these curved sections 44 of the first and second clamping springs 41, 42. For example, the middle section 50, 53, 54 can have a transverse wall 50, which is arranged transversely to the first or second conductor insertion direction L1, L2. This transverse wall 50 divides the interior of the housing 2 into two separate chambers. The clamping springs 41, 42 are separated from one another by the transverse wall 50. The transverse wall 50 can also form a conductor stop for the first and/or second electrical conductor. The middle section 50, 53, 54 can also have a first longitudinal wall section 53 extending from the transverse wall 50 in the direction of the first clamping spring 41. The middle section 50, 53, 54 can also have a second longitudinal wall section 54 extending from the transverse wall 50 in the direction of the second clamping spring 41. The two longitudinal side wall sections 53, 54 are each arranged on the transverse wall 50 on both sides. The arcuate sections 44 are each in contact with the end faces of the longitudinal wall sections 53 , 54 .

The inner piece 5 can also have a first extension 51 projecting from the middle section 50, 53, 54 in the direction of the first conductor insertion opening 11 and/or a have a second extension 52 protruding from the middle section 50, 53, 54 in the direction of the second conductor insertion opening 12. The first extension 51 is positioned at a slight angle to the first conductor insertion direction L1 or has a section that is inclined to the first conductor insertion direction L1. The second extension 52 is positioned at a slight angle to the second conductor insertion direction L2 or has a section that is inclined to the second conductor insertion direction L2.

the figure 2 shows the basic structure of such a closure piece using the example of the first closure piece 21 arranged on the left. It can be seen that the first closure piece 21 has a frame-like section 26 that is preferably closed on the peripheral side and has a through-opening that forms the conductor insertion opening 11 . Four side walls 27 which have lateral window-like openings 24 protrude from the frame-like section 26 . In addition, two first projections 23 protrude from the frame-like section 26, preferably as an extension of two opposite side walls 27, which run parallel to one another and are spaced apart from one another. How based on figure 1 As can be seen, the first projections 23 extend into the inner region of the arcuate side webs 48 of the first clamping spring 41. In addition, the closure piece 21 can have lateral window-like openings 24. The window-like openings 24 can be arranged in pairs opposite one another in respective side walls of the first closure piece 21 . The side walls 27 are set back inwards relative to the circumference of the frame-like section 26 . The second closure piece can be designed in the same way. In this case, the second closure piece 22 can have second protruding projections 25 which extend into the inner region of the arcuate side webs 48 of the second clamping spring 42 .

the figure 3 shows the main housing part 20. The relatively simple structure without special contours or moldings on the inner or outer walls can be seen. In the assembled state, the frame-like section 26 can bear against the end face 28 of the main housing part 20 due to the side walls 27 that are set back and arranged inside the main housing part 20 (cf figure 1 ).

the figure 4 shows the main housing part 20 with the second closure piece 22 inserted.

the figure 5 shows the contact insert with the inner piece 5 placed on it with further details. In particular, the design of the first and second clamping springs 41, 42 with the side bars 48 and the transverse bar 45 used for attachment to the conductor rail is clearly visible. It can also be seen that the first and/or the second clamping spring 41, 42 can have an edge 47 in the root area 46. With this edge 47, the clamping spring can be additionally supported on the inner wall of the main housing part 20 and dig in there a little under tensile stress.

the figure 6 shows the contact insert 3, 41, 42 without the inner piece 5.

the figure 7 shows a single clamping spring, which can form the first or the second clamping spring, with the features already explained.

the figure 8 shows a view of the inner piece 5 in a viewing direction in which the middle section 50, 53, 54 designed in the manner of a double-T shape can be seen. Starting from the transverse wall 50, two spaced-apart first longitudinal wall sections 53 extend from both ends of the transverse wall 50 in one direction and two spaced-apart second longitudinal wall sections 54 in the opposite direction. It is also clear that the first extension 51 and the second extension 52 protrude significantly further from the transverse wall 50 than the respective longitudinal wall section 53, 54.

the figure 9 shows the conductor rail 3. Recognizable are fastening tongues 30 protruding in the longitudinal direction at both ends facing away from one another, which at the same time also form the clamping point for the electrical conductor. On the underside, ie the side of the busbar 3 facing away from the clamping point, the fastening tongues 30 have respective depressions 31, for example in the form of grooves, into which the respective crossbar 45 of a clamping spring can be inserted in order to in this way to be attached to the busbar 3 by means of a form fit. Instead of such a depression there could also be an elevation.

the figure 10 shows a connecting terminal 1, which is constructed in principle as the basis of figure 1 described connection terminal 1, but without the locking pieces 21, 22. Such a connection terminal 1 can already be used to connect electrical conductors. The connecting terminal 1 can then be equipped with the first or the second closure piece 21, 22, as required by the user's choice.

the figure 11 shows a main housing part 20 that only needs to be closed off with the first closure piece 21 on the side of the first conductor insertion opening 11 . On the side of the second conductor insertion opening 12 , the main housing part already has the corresponding closing elements, which can be designed analogously to a second closure piece and in particular contain the second projection 25 . These closing elements can be formed in one piece with the main housing part 20 .

Reference list:

1

- Connection clamp

2

- Housing

3

- power rail

5

- inner piece

11

- first conductor entry hole

12

- second conductor entry hole

20

- Main body part

21

- first locking piece

22

- second locking piece

23

- first projection

24

- window-like opening

25

- second projection

26

- frame-like section

27

- Side wall

28

- Front side of the main body part

30

- Fastening tongue

31

- Deepening

41

- first clamping spring

42

- second clamping spring

43

- clamp legs

44

- arcuate section

45

- cross bar

46

- root area

47

- Edge

48

- side bar

50

- bulkhead

51

- first process

52

- second process

53

- first longitudinal wall section

54

- second longitudinal wall section

L1

- first conductor entry direction

L2

- second conductor entry direction

Claims (24)

Connecting terminal (1) for connecting at least one first electrical conductor to a second electrical conductor, the connecting terminal (1) having a housing (2) with a first conductor insertion opening (11) for inserting the first electrical conductor and with a second conductor insertion opening (12) for Inserting the second electrical conductor, the first and the second conductor insertion opening (11, 12) being arranged on opposite sides of the housing (2), the connecting terminal (1) having a contact insert (3, 41, 42) which has a first clamping spring (41), a second clamping spring (42) and a busbar (3), the first and the second clamping spring (41, 42) being fastened to end regions of the busbar (3) pointing away from one another and a free space between the first and the second clamping spring (41, 42) is present, wherein the connecting terminal (1) as a further separate component has an inner piece (5) which is at least one m middle section (50, 53, 54) is arranged predominantly in the free space between the first and the second clamping spring (41, 42). Connection clamp according to Claim 1, characterized in that the inner piece (5) consists of an insulating material. Connection clamp according to one of the preceding claims, characterized in that the inner piece (5) is designed for at least partially positively supporting and/or applying a region of the first and/or second clamping spring (41, 42). Connecting terminal according to one of the preceding claims, characterized in that the contact insert (3, 41, 42) with the inner piece (5). forms a self-supporting structural unit that can be inserted preassembled into the housing (2). Connection clamp according to one of the preceding claims, characterized in that the first and the second clamping spring (41, 42) each have a clamping leg (43) and an arcuate section (44), the arcuate sections (44) of the first and the second clamping spring (41, 42) can be arranged at a smaller distance from one another than the clamping legs (43). Connection clamp according to one of the preceding claims, characterized in that - The inner piece (5) has a first extension (51) protruding from the middle section (50, 53, 54) in the direction of the first conductor insertion opening (11).
and or - The inner piece (5) has a second extension (52) protruding from the middle section (50, 53, 54) in the direction of the second conductor insertion opening (12). Connecting terminal according to claim 6, characterized in that - The first extension (51) extends in the direction of the first conductor insertion opening (11) at least in sections obliquely to the conductor insertion direction (L1) of the first electrical conductor
and or - The second extension (52) extends in the direction of the second conductor insertion opening (12) at least in sections obliquely to the conductor insertion direction (L2) of the second electrical conductor. Connection clamp according to one of Claims 6 to 7, characterized in that - The first extension (51) over at least 50% of the longitudinal extent of the first clamping spring (41) in the conductor insertion direction (L1) of the first electrical conductor is designed to overlap with the first clamping spring (41).
and or - the second extension (52) over at least 50% of the longitudinal extent of the second clamping spring (42) in the conductor insertion direction (L2) of the second electrical conductor is designed to overlap with the second clamping spring (42). Connection terminal according to one of the preceding claims, characterized in that the housing (2) has a main housing part (20) which is designed as a one-piece structural unit and extends at least predominantly from the first conductor entry opening (11) to the second conductor entry opening (12). Connecting terminal according to claim 9, characterized in that - The housing (2) has at least one first closure piece (21) which can be inserted into the main housing part (20) in the area of the first conductor entry opening (11) and serves to close off the housing (2) in the area of the first conductor entry opening (11).
and or - the housing (2) has at least one second closing piece (22) which can be inserted into the main housing part (20) in the area of the second conductor entry opening (12) and serves to close off the housing (2) in the area of the second conductor entry opening (12). Connecting terminal according to Claim 10, characterized in that the first closure piece (21) has at least one first projection (23) protruding into the interior of the main housing part (20) and/or the second closure piece (22) has at least one protrusion (23) into the interior of the main housing part (20) projecting second projection (24). Connecting terminal according to claim 11, characterized in that - The first projection (23) over at least 50% of the longitudinal extent of the first clamping spring (41) in the conductor insertion direction (L1) of the first electrical conductor is designed to overlap with the first clamping spring (41).
and or - The second projection (24) over at least 50% of the longitudinal extent of the second clamping spring (42) in the conductor insertion direction (L2) of the second electrical conductor is formed with the second clamping spring (42) overlapping. Connection clamp according to claim 11 or 12, characterized in that - The first projection (23) has a convex outer contour at the free end, which is adapted to the concave inner contour of the first clamping spring (41) adjacent to the first projection (23).
and or - The second projection (24) has a convex outer contour at the free end which is adapted to the concave inner contour of the second clamping spring (42) adjacent to the second projection (24). Connection clamp according to one of Claims 9 to 13, characterized in that the first closure piece (21) and/or the second closure piece (22) has window-like openings (24) arranged in opposite side walls of the closure piece. Connecting terminal according to one of Claims 9 to 14, characterized in that the main housing part (20) is tubular and has a receiving space for receiving the contact insert (3, 41, 42). Connection clamp according to one of the preceding claims, characterized in that the first clamping spring (41) has at least two arcuate side webs (44), between which a clamping leg (43) of the first clamping spring (41) is arranged. Connection clamp according to Claim 16, characterized in that the side bars (44) and the clamping leg (43) protrude from a common root area (46) of the first clamping spring (41), the side bars (44) at their ends remote from the root area (46). are connected to one another via a transverse web (45). Conductor connection terminal according to Claim 17, characterized in that the transverse web (45) is arranged on the side of the conductor rail (3) which is remote from the clamping leg (43). Conductor connection terminal according to Claim 16 or 17, characterized in that the first clamping spring (41) has an edge (47) at the free end of the root region (46) which points in a direction which is predominantly opposite to the direction in which the clamping leg (43) extends. Connection terminal according to one of the preceding claims, characterized in that the contact insert (3, 41, 42) is designed as a direct plug-in connection for directly plugging in the first and/or the second electrical conductor. Connection clamp according to one of the preceding claims, characterized in that the connection clamp (1) is constructed without an actuating element of the first and/or second clamping spring (41, 42). Connection clamp according to one of the preceding claims, characterized in that - the middle section (50, 53, 54) of the inner piece (5) has a concave inner contour in the area facing the first clamping spring (41), which corresponds to the convex outer contour of the first clamping spring (41 ) is equivalent to
and or - the middle section (50, 53, 54) of the inner piece (5) has a concave inner contour in the area facing the second clamping spring (42), which corresponds to the convex outer contour of the second clamping spring (42) adjacent to the middle section (50, 53, 54). Connection terminal according to one of the preceding claims, characterized in that the central section (50, 53, 54) of the inner piece (5) forms a conductor stop for the first and/or second electrical conductor which limits the insertion depth. Connecting terminal (1) for connecting at least one first electrical conductor to a second electrical conductor, the connecting terminal (1) having a housing (2) with a first conductor insertion opening (11) for inserting the first electrical conductor and with a second conductor insertion opening (12) for Inserting the second electrical conductor, the first and the second conductor insertion opening (11, 12) being arranged on opposite sides of the housing (2), the connecting terminal (1) having a contact insert (3, 41, 42) which has a first clamping spring (41), a second clamping spring (42) and a busbar (3), the first and the second clamping spring (41, 42) being fastened to end regions of the busbar (3) pointing away from one another and a free space between the first and the second clamping spring (41, 42) is present.

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