conductor connection terminal

Abstract

A conductor terminal (1) for connecting an electrical conductor by means of spring force, wherein the conductor terminal (1) has at least one insulating housing (2), a busbar (3) with a contact section (31) and a clamping spring (4) with a clamping leg (43) for clamping the electrical conductor to the contact section (31), wherein the conductor terminal (1) has an actuating element (5) displaceably arranged in the insulating housing (2), which is configured to deflect the clamping leg (43) into an open position, wherein at least when the clamping leg (43) is deflected by the actuating element (5) in the direction of the open position, a spring force generated by the clamping leg (43) acts directly or indirectly, via at least one other component of the conductor terminal (1), in particular via the actuating element (5), on a load-bearing section (23) of the insulating housing (2), characterized in thatthat the insulating housing (2) has a first support surface (24) which is supported on the busbar (3) at least when the clamping arm (43) is deflected in the direction of the open position by the actuating element (5) and by which the load-bearing section (23) of the insulating housing (2) is supported at least partially against the spring force acting by the clamping arm (43).

Description

[0001] The invention relates to a conductor terminal for connecting an electrical conductor by means of spring force, wherein the conductor terminal has at least an insulating housing, a busbar with a contact section and a clamping spring with a clamping leg for clamping the electrical conductor to the contact section, wherein the conductor terminal has an actuating element displaceably arranged in the insulating housing, which is configured to deflect the clamping leg into an open position, wherein at least when the clamping leg is deflected by the actuating element in the direction of the open position, a spring force generated by the clamping leg acts directly or indirectly via at least one other component of the conductor terminal, in particular via the actuating element, on a load-bearing section of the insulating housing.

[0002] A conductor connection terminal of this type is known from DE 10 2017 109 694 B4.

[0003] The invention is based on the objective of providing an improved conductor connection terminal.

[0004] This problem is solved in a conductor terminal of the type mentioned above by providing the insulating housing with a first support surface. This support surface rests against the busbar, at least when the clamping arm is deflected towards the open position by the actuating element. This support surface also provides at least partial support to the load-bearing section of the insulating housing against the spring force exerted by the clamping arm. In this way, the first support surface, in conjunction with the busbar, advantageously supports and stabilizes the load-bearing section of the insulating housing. The load-bearing section is then not deflected, or deflected to a lesser extent, by the acting spring force.

[0005] It is generally possible for the first support surface to be permanently supported on the busbar or even in other actuation states. According to the invention, however, the first support surface is supported on the busbar at least when the clamping arm is deflected towards the open position by the actuating element.

[0006] The invention is particularly suitable for conductor connection terminals where the load-bearing section of the insulating housing is designed as a comparatively thin wall or other relatively delicate section of the insulating housing, e.g., as a partition between an actuating channel and an adjacent conductor entry channel. The material of the insulating housing tends to become less rigid, especially when exposed to moisture, and is therefore more easily deformed by the acting spring force. In unfavorable situations, this can lead to the clamping arm not being deflected far enough by the actuating element to open the clamping point sufficiently for the trouble-free insertion of the electrical conductor, which can make clamping an electrical conductor more difficult.This can be avoided by supporting the first support surface on the conductor rail and the associated support of the load-bearing section.

[0007] The support surface, like the load-bearing section, can be formed from the same material as the insulating housing. The support surface and the load-bearing section can be arranged on opposite sides of the same wall of the insulating housing, e.g., directly opposite each other at the same height or slightly offset from each other. The spring force generated by the clamping arm can be transmitted to the load-bearing section via the actuating element, for example, if, in the case of a deflected clamping arm, an actuating section of the actuating element is arranged between the clamping arm and the load-bearing section.

[0008] The actuating element can be a separate component of the terminal block, permanently installed within it. In this case, the actuating element can be, for example, a sliding push button or a pivoting lever. Alternatively, the actuating element can be a separate tool that is only inserted into the terminal block when needed to deflect the clamping arm.

[0009] According to an advantageous embodiment of the invention, a first counter-support surface is formed on the busbar, against which the first support surface of the insulating housing is supported, at least when the clamping leg is deflected by the actuating element in the direction of the open position. In this way, the force transmitted via the first support surface can be effectively introduced into the busbar at a predefined point.

[0010] According to an advantageous embodiment of the invention, a support projection is formed on the busbar, designed exclusively or predominantly for supporting the first support surface, on which the first counter-support surface is arranged. In this way, the busbar can be optimally adapted to its function of supporting the support surface. The support projection can be advantageously shaped for this purpose, in particular such that it supports the support surface but does not impede other functions of the conductor terminal, such as the insertion of the electrical conductor. The support projection can extend from a substantially flat main body of the busbar, for example, in a direction opposite to the conductor insertion direction of an electrical conductor into the conductor terminal. The support projection can be formed from the same material as the busbar, for example.as a punched-out and raised tab or a tab bent from the edge of the busbar or the main body.

[0011] According to an advantageous embodiment of the invention, the insulating housing has an elongated actuating channel in which the actuating element is slidably mounted. The actuating channel provides good guidance for the actuating element, allowing it to be easily actuated as desired and to deflect the clamping leg in a controlled manner. If the actuating element is designed as a separate actuating element of the conductor terminal, e.g., in the form of a sliding push button, this push button can be guided by the actuating channel with virtually no play in the direction of movement.

[0012] According to an advantageous embodiment of the invention, the conductor terminal has a conductor entry channel adjacent to the actuating channel, into which an electrical conductor to be connected is inserted. The conductor entry channel is separated from the actuating channel by a partition. The conductor entry channel facilitates the user's insertion of the electrical conductor up to the busbar or to the clamping point between the clamping arm and the busbar. The partition ensures, for example, that the electrical conductor can be moved independently of the actuating element and cannot directly contact the actuating element. The partition can be relatively thin-walled to save installation space and material, thus making the conductor terminal compact and cost-effective to manufacture.

[0013] According to an advantageous embodiment of the invention, the first support surface is designed as a surface section of the partition wall. In this way, the partition wall has an additional support function.

[0014] According to an advantageous embodiment of the invention, the load-bearing section is designed as a surface section or other section of the partition wall. In particular, the load-bearing section can be arranged on the side of the partition wall facing away from the first support surface.

[0015] It is advantageous if the first support surface is located relatively close to the load-bearing section, i.e., at the point subjected to high stress by the spring force.

[0016] According to an advantageous embodiment of the invention, the distance between the first support surface and the point where the spring force of the clamping arm is applied to the load-bearing section is less than the maximum possible pivoting path of the clamping arm from the open position to the clamped position, particularly when no electrical conductor is inserted. The maximum possible pivoting path of the clamping arm can be measured, for example, at the free end of the clamping arm or, if the busbar has a conductor feed-through opening, in the plane of the conductor feed-through opening.

[0017] According to an advantageous embodiment of the invention, the busbar has a conductor feed-through opening through which an electrical conductor to be connected can be inserted. This allows for convenient placement of the electrical conductor to be clamped, which can, for example, be clamped to the busbar by means of the clamping arm on an inner side of the conductor feed-through opening.

[0018] According to an advantageous embodiment of the invention, the conductor feedthrough opening is completely or predominantly surrounded on its circumference by a collar, in particular a collar in the form of a material pass-through made from the material of the busbar. The collar provides, in particular, an enlarged current-pass cross-section and thus improved electrical conductivity in the area of ​​the conductor feedthrough opening. The collar also stiffens the busbar, making it correspondingly more robust, especially with greater bending stiffness. If the collar is made of an electrically conductive material, the contact section of the busbar can, for example, be formed on the collar, particularly on the inside of the collar. A particularly advantageous design is the collar in the form of a material pass-through, where, for example, material from the busbar is formed into the collar during the production of the conductor feedthrough opening.

[0019] According to an advantageous embodiment of the invention, the support projection extends from a substantially flat main body of the busbar on the side facing away from the collar. In this way, the support projection can be conveniently positioned on the busbar without adversely affecting the possibility of designing the busbar with a collar that completely encircles the circumference.

[0020] According to an advantageous embodiment of the invention, the clamping spring has a contact leg connected to the clamping arm, with which the clamping spring is supported on the busbar. The contact leg can be supported, in particular, on the inside of the conductor entry opening, the collar, or a separate through-opening of the busbar. The contact leg can, for example, be connected to the clamping spring via a spring arc. Such a design of the clamping spring, together with the busbar, creates a self-supporting contact insert of the conductor terminal, characterized in that the insulating housing is not subjected to the spring force of the clamping spring, at least in the clamping position, because this spring force is introduced into the busbar on both sides, i.e., on the side of the contact leg and on the side of the clamping arm. In the clamping position, the clamping arm lies, for example,The clamping leg rests against the inside of the conductor entry opening or the collar on the busbar when no electrical conductor is connected, or when an electrical conductor is connected, resting against that conductor. In both cases, the busbar absorbs the forces of the clamping spring on both sides.

[0021] The invention enables the conductor terminal to be designed with a contact insert that is self-supporting even when the clamping arm is fully or partially deflected into the open position. Self-supporting contact inserts are generally known, but are usually designed such that the self-supporting property is only effective when the clamping arm is in the clamping position. This disadvantage is overcome by the present invention.

[0022] According to an advantageous embodiment of the invention, the insulating housing has a second support surface by which the busbar can be fixed within the insulating housing. This has the advantage that the busbar is fixed in a defined manner within the insulating housing and cannot move from a desired position, i.e., it cannot slip. The second support surface can also absorb, at least temporarily, forces that may occur when moving the actuating element into the actuated position until the clamping arm is ultimately deflected into the open position, for example, due to a certain amount of play between the first support surface and the first counter-support surface, which may be present when the actuating element is not actuated.

[0023] The second support surface allows the busbar to be temporarily supported against the spring force exerted on it by the mounting leg. Furthermore, the second support surface can also serve to fix the contact insert within the insulating housing.

[0024] According to an advantageous embodiment of the invention, a second counter-support surface is formed on the busbar, which can be supported on the second support surface. In this way, the force transmitted via the second support surface can be effectively introduced into the busbar.

[0025] According to an advantageous embodiment of the invention, the second counter-support surface is formed on the collar of the busbar. In this way, the collar has an additional function, namely to fix the busbar in the insulating housing. No further component needs to be added to provide the counter-support surface.

[0026] The clamping arm, together with the contact section of the busbar, can form a clamping point for connecting an electrical conductor between the clamping arm and the contact section. In the open position, at least the clamping edge of the clamping arm is pivoted away from the contact section of the busbar. The clamping arm can be pivoted, for example, between an open position in which the electrical conductor is freely movable between the clamping arm and the contact section, and a clamped position in which the clamping arm clamps the electrical conductor to the contact section.

[0027] The invention is advantageously suited both for conductor terminals in an embodiment without a self-holding function of the clamping arm in the open position and for embodiments with a self-holding function of the clamping arm in the open position. Such a self-holding function can be realized, for example, by the conductor terminal having a retaining element that holds the clamping arm in the open position, even without further manual actuation of the actuating element. For example, the clamping arm can be latched to the retaining element in the open position. Such a conductor terminal can additionally be further developed by an automatic release function of the clamping arm, for example, such that the conductor terminal has a release element which, when force is applied by the inserted electrical conductor to be clamped, releases the clamping arm from the retaining element.by releasing the locking mechanism in the open position, which allows the clamping arm to spring back automatically and clamp the electrical conductor to the busbar.

[0028] In a conductor terminal block with such an open-holding function of the clamping arm, i.e., a retaining element for holding the clamping arm in the open position, supporting a load-bearing section of the insulating housing against the first support surface is not strictly necessary or at least less relevant in this state of the clamping arm being held by the retaining element, because in the latched open position, at least no significant force is transmitted to the actuating element by the clamping spring. Nevertheless, the support of the load-bearing section of the insulating housing against the first support surface according to the invention is also advantageous in such an embodiment for the process of deflecting the clamping arm into the open position, i.e., for the transition state before the clamping arm is held by the retaining element and the retaining element assumes the load.

[0029] A method for operating a conductor terminal of the type described above has the following characteristics: a) Deflection of the clamping arm in the direction of the open position by moving the actuating element, b) Transferring a spring force generated by the clamping leg directly or indirectly via at least one other component of the conductor terminal, in particular via the actuating element, to the load-bearing section of the insulating housing, c) Supporting the first support surface on the busbar and thereby supporting the load-bearing section of the insulating housing at least partially against the spring force acting from the clamping leg.

[0030] This also allows the previously explained advantages to be realized.

[0031] For the purposes of the present invention, the indefinite term "a" is not to be understood as a numeral. Therefore, when, for example, a component is mentioned, this is to be interpreted as "at least one component". Where angles are specified in degrees, these refer to a circle of 360 degrees (360°).

[0032] The invention is explained in more detail below with reference to exemplary embodiments and the accompanying drawings. These show... Fig. 1. A conductor terminal block shown in a sectional view from the side with the actuating element unactuated. Fig. 2 the conductor connection terminal according to Fig. 1 when the actuating element is engaged, Fig. 3 a clamping spring in the relaxed state, Fig. 4 the clamping spring according to Fig. 3 in a latched open position, Fig. 5 Another embodiment of a conductor terminal block in side view with the actuating element unactuated, Fig. 6 the parts of the conductor terminal according to Fig. 5 without the insulating housing, Fig. 7 the parts according to Fig. 6 in perspective view, Fig. 8 Another embodiment of a conductor terminal block in side view with the actuating element unactuated, Fig. 9 the parts of the conductor terminal according to Fig. 8 without the insulating housing, Fig. 10 the parts according to Fig. 9 in perspective view.

[0033] The conductor terminal 1 has an insulating housing 2 in which a contact insert is arranged, comprising a busbar 3 and a clamping spring 4. The busbar 3 has a main body 30, which is designed as a substantially flat sheet metal part. A conductor entry opening 32 is formed on this main body 30 by a forming process. Furthermore, a collar 33 in the form of a material passage is formed on the busbar 3. The collar 33 surrounds the conductor entry opening 32 on its circumference and forms a contact section 31 of the busbar on one side, which is designed for clamping an electrical conductor.

[0034] The clamping spring 4 has a contact leg 41, a spring arc 42 adjoining the contact leg 41, and a clamping leg 43 adjoining the spring arc 42. The contact leg 41 serves to support the clamping spring 4 against the spring force of the clamping leg 43. For this purpose, the clamping spring 4 is engaged with its contact leg 41 in the conductor feedthrough opening 32 or on the inside of the collar 33 and supported there. The clamping leg 43 extends in the Fig. In the clamping position shown in Figure 1, in which no electrical conductor is inserted, the contact spring extends to and rests against contact section 31. If the clamping spring 4 is installed under preload, the busbar 3 absorbs the spring forces because the contact leg 41 rests against the busbar 3 on one side and the clamping leg 43 rests against the busbar 3 on the other side, either directly or, if an electrical conductor is clamped, via this conductor. The contact insert is therefore self-supporting, so that the insulating housing 2 is essentially not subjected to forces from the clamping spring 4.

[0035] The conductor terminal 1 has an actuating element 5, e.g., in the form of a slidably mounted actuating push button. The actuating element 5 has a manual actuating surface 50, on which the actuating element 5 can be manually actuated with an actuating force, e.g., a pressure force. The actuating element 5 has an actuating section 51 that extends into the interior of the insulating housing 2 and serves to mechanically actuate the terminal arm 43 in order to deflect it into the open position. The insulating housing 2 has an actuating channel 21 in which the actuating element 5 is arranged and guided in a sliding direction.

[0036] Adjacent to the actuation channel 21, the insulating housing 2 has a conductor entry channel 20 through which an electrical conductor is to be inserted into the insulating housing 2 in a predetermined conductor entry direction L and led to the clamping point between the clamping leg 43 and the contact section 31. It can be seen that the conductor entry channel 20 is separated from the actuation channel 21 by a relatively thin partition 22 of the insulating housing 2.

[0037] If the actuating element 5 is now actuated, as the Fig. As shown in Figure 2, it is further displaced into the interior of the insulating housing 2. The clamping leg 43 is deflected towards the open position via the actuating section 51, i.e., the free end of the clamping leg 43 is moved away from the contact section 31. In comparison to the Fig. In the clamping position shown in Figure 1, the clamping spring 4 is now more tightly tensioned and exerts a greater spring force. The actuating element 5, or rather its actuating section 51, is now clamped between the clamping leg 43 and the partition 22. A spring force from the clamping spring 4 thus acts through the clamping leg 43 on the actuating section 51 and, via this, on the partition 22, in particular on a load-bearing section 23 formed on the partition 22. In a conductor terminal according to the prior art, this can cause the partition 22 to yield and deflect slightly at the point of high stress. This can, on the one hand, lead to an undesirable reduction in the cross-section of the conductor entry channel 20 in the area of ​​the load-bearing section 23. Furthermore, this can result in the clamping leg 43 not being able to deflect by the desired amount A, i.e.,not fully open, but can only be deflected by a smaller dimension B, which can make the insertion of electrical conductors more difficult.

[0038] In a conductor connection terminal according to the prior art, a reaction force is transmitted from the clamping leg 41 to the busbar 3 when the clamping leg 43 is deflected towards the open position. In a conductor connection terminal according to the prior art, this has the additional effect that the busbar 3 must be supported on a second support surface 25 of the insulating housing 2 to prevent the busbar 3 from leaving its desired position.

[0039] Therefore, it is proposed that the insulating housing 2 has a first support surface 24, which can also be formed on the partition 22 and can be arranged on the side of the partition 22 facing away from the load-bearing section. This first support surface 24 can be supported on the busbar 3 in any way possible. To enable a defined bearing and support of the first support surface 24, a first counter-support surface 35 can be formed on the busbar 3, opposite the first support surface 24. The first counter-support surface 35 can, for example, be arranged on a support projection 34 designed exclusively or predominantly for supporting the first support surface 24, which is attached to or formed on the busbar 3.

[0040] Because the first support surface 24 is supported on the busbar 3 or on the first counter-support surface 35, the spring force transmitted from the clamping leg 43 to the actuating element 5 and from the actuating element 5 to the partition 22 is again absorbed by the busbar 3. Since the contact leg 41 remains supported on the busbar 3, this creates a contact insert that is self-supporting even when the clamping spring 4 is deflected into the open position, and accordingly largely protects the insulating housing 2 from forces exerted by the clamping spring 43. The previously described yielding and deflection of the partition 22 is thus avoided.

[0041] Nevertheless, even in the embodiment according to the invention, the second support surface 25 of the insulating housing 2 can be usefully used for securing the busbar 3 and thus the entire contact assembly within the insulating housing 2. For example, a second counter-support surface 36, designed as a counterpart to the second support surface 25, can be formed on the busbar 3, e.g., on the outside of the collar 33, by which the busbar 3 can be supported on the second support surface 25.

[0042] The in the Fig. 3 and Fig. The clamping spring 4 has a clamping leg 43, a spring arc 42 adjoining the clamping leg 43, and a support leg 41 adjoining the spring arc 42. Furthermore, a retaining element 7 is provided, which is integrally formed with the clamping spring 4, in particular with a region 40 of the support leg 41 that has a reduced width than the region of the support leg 41 adjoining the spring arc 42. The retaining element 7 serves to hold the clamping leg 43 in the open position, as shown in Fig. 4 is recognizable.

[0043] Furthermore, a release element 8 is provided, which is also formed integrally with the clamping spring 4, e.g., as a section of material that connects to the retaining element 7. The release element 8 has a release section 80 at its free end, through which the clamping leg 43, which is held on the retaining element 7 in the open position, can be released from the retaining element 7 when an electrical conductor to be clamped, inserted in the conductor insertion direction L, exerts an actuating force on the release section 80.

[0044] Actuating surfaces 44 are formed on the clamping leg 43, e.g. in the form of laterally projecting tabs. The actuating surfaces 4 serve to receive actuating forces by actuating sections 51 of the actuating element 5.

[0045] Towards the free end, a clamping tongue 45 is bent on the clamping leg 43. The clamping tongue 45 terminates at its free end with a clamping edge 46, which serves to clamp the electrical conductor. The clamping tongue 45 can be projected from the material of the clamping leg 43 and bent in a direction extending away from the mounting leg 41. Due to the projection of the clamping tongue 45, first locking elements 47 remain on both sides of the clamping tongue 45 on the clamping leg 43, e.g., in the form of projecting locking arms. The first locking elements 47 are designed for snap-fit ​​coupling with second locking elements 70 of the holding element 7. The locking of the first locking elements 47 with the second locking elements 70 occurs in the open position, as shown in Fig. 4 is recognizable.

[0046] Based on the Fig. 3 and Fig. The clamping spring described in section 4, with the retaining element 7 and the release element 8, is particularly suitable for embodiments of conductor connection terminals with an automatic release functionality of the clamping leg 43 as a result of the insertion of an electrical conductor, i.e., an automatic release of the clamping leg 43 from the open position by actuating the release element 8.

[0047] The Fig. Figure 5 shows a conductor connection terminal 1 with an insulating housing 2 in which a contact insert with a busbar 3 and a clamping spring 4 is arranged according to the Fig. 3, Fig. 4 is arranged. This gives the conductor connection terminal 1 the previously described automatic release functionality due to the design of the clamping spring 4. It can be seen that the release section 80 projects into the area into which an electrical conductor is to be inserted in the conductor insertion direction L into the insulating housing and can pass through the conductor entry opening 32 up to the release section 80.

[0048] Furthermore, the conductor connection terminal 1 is according to Fig. 5 is designed like the conductor connection terminal described at the beginning. In particular, a support projection 34 is formed on the main body 30, which has a counter-support surface 35 for supporting the first support surface 24.

[0049] The Fig. 6 and Fig. Figure 7 shows the advantageous design of the busbar 3 with the support projection 34 integrally formed on it, which, for example, only needs to be arranged on one side of the conductor feedthrough opening 32.

[0050] As particularly in Fig. As can be additionally seen in Figure 7, the actuating element 5 can branch out from the actuating surface 50 into two adjacent actuating sections 51, which can be shaped like actuating arms. A portion of the clamping spring 4 can be arranged in a free space between the actuating sections 51. The actuating sections 51 act on the previously described lateral actuating surfaces 44 of the clamping leg 43. The Fig. 6 the contact insert in the unactuated state, i.e. the clamping spring 4 is in the clamping position. According to Fig. 7 the clamping spring 4 is moved into the open position, in which the clamping leg 43 is locked onto the retaining element 7.

[0051] The Fig. Figure 8 shows an embodiment of a conductor terminal block, which, like the one previously described, is based on the Fig. 5. The embodiment described includes a busbar 3 and a clamping spring 4 according to the Fig. 3, Fig. 4. In this embodiment, the busbar 3 also has a first counter-support surface 35, which is arranged on a support projection 34. In this case, the support projection 34 is formed by punching out and bending a lateral section of the main body 30 of the busbar 3. It can be seen that the support projection 34 extends obliquely to the direction of extension of the main body 30.

[0052] The Fig. 9 and Fig. 10 illustrate in comparable views such as the Fig. 6 and Fig. 7 shows once again the design of the support projection 34 on the conductor rail 3. This shows the Fig. 9 the contact insert again in the unactivated state, the Fig.Figure 10 shows the contact insert in the actuated state, in which the clamping spring 4 is locked in the open position on the retaining element 7. Reference symbol list 1 conductor connection terminal 2 insulating housings 3 Power rail 4 clamping springs 5 Actuating element 7 Holding element 8 Solvent element 20 conductor entry channel 21 Actuation channel 22 Partition wall 23 Load-bearing section 24 first support surface 25 second support surface 30 main bodies 31 Contact section 32 Conductor feedthrough opening 33 collars 34 Support projection 35 first counter-support surface 36 second counter-support surface 40 Area of ​​the investment leg 41 Attachment legs 42 feather bows 43 clamping legs 44 operating area 45 clamping tongue 46 clamping edge 47 first locking element 50 operating area 51 Actuation section 70 second locking element 80 Solution section L conductor entry direction QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2017 109 694 B4

[0002]

Claims

[1] A conductor terminal (1) for connecting an electrical conductor by means of spring force, wherein the conductor terminal (1) has at least an insulating housing (2), a busbar (3) with a contact section (31) and a clamping spring (4) with a clamping leg (43) for clamping the electrical conductor to the contact section (31), wherein the conductor terminal (1) has an actuating element (5) displaceably arranged in the insulating housing (2), which is configured to deflect the clamping leg (43) into an open position, wherein at least when the clamping leg (43) is deflected by the actuating element (5) in the direction of the open position, a spring force generated by the clamping leg (43) acts directly or indirectly, via at least one other component of the conductor terminal (1), in particular via the actuating element (5), on a load-bearing section (23) of the insulating housing (2), characterized by, that the insulating housing (2) has a first support surface (24) which is supported on the busbar (3) at least when the clamping arm (43) is deflected in the direction of the open position by the actuating element (5) and by which the load-bearing section (23) of the insulating housing (2) is supported at least partially against the spring force acting by the clamping arm (43). [2] Conductor terminal according to claim 1, characterized by , that a first counter-support surface (35) is formed on the busbar (3), on which the first support surface (24) of the insulating housing (2) is supported at least when the clamping leg (43) is deflected by the actuating element (5) in the direction of the open position. [3] Conductor terminal according to claim 2, characterized by, that a support projection (34) is formed on the conductor rail (3) exclusively or predominantly for supporting the first support surface (24), on which the first counter-support surface (35) is arranged. [4] Conductor terminal according to one of the preceding claims, characterized by , that the insulating housing (2) has an elongated actuating channel (21) in which the actuating element (5) is slidably mounted. [5] Conductor terminal according to claim 4, characterized by , that the conductor terminal (1) has a conductor entry channel (20) adjacent to the actuating channel (21), into which an electrical conductor to be connected is to be inserted, wherein the conductor entry channel (20) is separated from the actuating channel (21) by a partition (22). [6] Conductor terminal according to claim 5, characterized by , that the first support surface (24) is designed as a surface section of the partition wall (22). [7] Conductor terminal according to claim 5 or 6, characterized by , that the load-bearing section (23) is designed as a surface section or other section of the partition wall (22). [8] Conductor terminal according to one of the preceding claims, characterized by , that the distance between the first support surface (24) and the point of force application of the spring force of the clamping leg (43) into the load-bearing section (23) is less than the maximum possible pivoting path of the clamping leg (43) from the open position to the clamping position. [9] Conductor terminal according to one of the preceding claims, characterized by , that the busbar (3) has a conductor feedthrough opening (32) through which an electrical conductor to be connected can be inserted. [10] Conductor terminal according to claim 9, characterized by, that the conductor feedthrough opening (32) is completely or predominantly surrounded on its circumference by a collar (33), in particular a collar in the form of a material penetration made from the material of the busbar (3). [11] Conductor terminal according to claim 10, characterized by , that the support projection (34) extends from a substantially planar main body (30) of the conductor rail (3) on the side facing away from the collar (33). [12] Conductor terminal according to one of the preceding claims, characterized by , that the clamping spring (4) has a support leg (41) connected to the clamping leg (43), with which the clamping spring (4) is supported on the busbar (3). [13] Conductor terminal according to claim 12, characterized by , that the insulating housing (2) has a second support surface (25) by which the busbar (3) can be fixed in the insulating housing (2). [14] Conductor terminal according to claim 13, characterized by, that a second counter-support surface (36) is formed on the conductor rail (3), which can be supported on the second support surface (25). [15] Conductor terminal according to claim 14, characterized by , that the second counter-support surface (36) is formed on the collar (33) of the conductor rail (3). [16] Conductor terminal according to one of the preceding claims, characterized by , that the conductor terminal (1) has a retaining element (7) which is designed to hold the clamping leg (43) in the open position. [17] Conductor terminal according to claim 16, characterized by , that the conductor terminal (1) has a release element (8) by actuating which the retaining element (7) can be deflected to such an extent that the clamping leg (43) held on the retaining element (7) is released from the retaining element (7). [18] Conductor terminal according to claim 17, characterized by, that the clamping leg (43) held in the open position on the holding element (7) can be released from the holding element (7) when an electrical conductor to be clamped exerts an actuating force on a release section (80) of the release element (8).

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