Abstract:
A wall feedthrough is provided, which is pluggable on one side, for connecting a voltage-carrying conductor of a solar generator to a combiner box housing. A two-part connector housing having a front housing part and an insert part which can be moved together with an electric terminal element as one unit relative to the front housing part, wherein the terminal element is pluggable on one side and has a spring-force clamp on the other side, and wherein in the closed state, the spring-force clamp is surrounded by a body sleeve of the front housing part, and in the open state the clamping device is pulled out of the body sleeve so as to be openable and closable, and wherein, for this purpose, the insert part has an exposed handle portion for the user.

Description:
TECHNICAL FIELD 
       [0001]    The present disclosure relates to an electric wall feedthrough pluggable on one side for connecting a voltage-carrying cable of a solar generator to a connection box housing, in particular to a combiner box of the solar installation, which should in particular be compatible with existing connector systems for solar installations. 
       BACKGROUND 
       [0002]    Solar modules are typically connected in series in so-called strings, and depending on the size of the solar generator several strings are connected in parallel. The power cabling of solar modules must meet a number of requirements for this purpose. Firstly, string voltages are currently typically up to 1000 volts, and currents are in the ampere range. Furthermore, the connection cables are at least partially routed in the open air, so that certain requirements must be met in terms of water resistance. 
         [0003]    For this purpose, the Applicant has developed a connector system under the brand SUNCLIX® that meets the specified requirements in an outstanding manner. The SUNCLIX® connector system includes single-pole electric connectors having a metal terminal element which is designed for the electric voltages and currents required in the solar sector. 
         [0004]    For solar installations, wall feedthroughs are possibly needed for electric feedthrough through a housing wall of a connection box, e.g. the housing wall of a combiner box or string combiner box. So it may be desirable for a connector to be directly installed in a wall of the connection box housing, so that the mating connector can directly be plugged to the housing. 
         [0005]    For this purpose, DE 10 2011 112 283 describes a single-pole electric wall feedthrough pluggable on both sides for cabling solar installations. Such feedthroughs may, for example, be used for string combiner boxes. Such a wall feedthrough pluggable on both sides is very easily operated by the user. However, it is a relatively complex solution which moreover requires a lot of space within the connection box housing which, on the other hand, it is not always compensated by the advantages of the two-sided pluggable connection. 
         [0006]    A wall-mountable electric connector with a multi-part housing is described in DE 10 2010 034 881. Although this connector is suitable for a variety of application fields, the ease of operation and the compatibility for certain applications in solar technology are further improvable. 
         [0007]    Due to the huge cost pressure, it is moreover desirable to keep the production, storage and logistics costs of a connector system for photovoltaic systems as low as possible on the one hand, and yet to provide for a flexible, but still simple and reliable installation when cabling solar systems on the other hand. 
       SUMMARY 
       [0008]    Therefore, an object of the present disclosure is to provide an electric wall feedthrough for connecting a voltage-carrying cable of a solar generator to a connection box housing, in particular to a combiner box housing of the solar installation, which is simple to operate and requires small space. 
         [0009]    Another object of the present disclosure is to provide a freely configurable wall feedthrough, to which, when installed, a conductor can be reversibly connected and disconnected therefrom in simple manner on the inner side of the housing. 
         [0010]    Another object of the present disclosure is to provide a wall feedthrough which can be integrated into an existing connector system with as few new components as possible. 
         [0011]    Another object of the present disclosure is to provide a wall feedthrough which exhibits high contact reliability and good protection against the penetration of moisture into the connection box housing. 
         [0012]    The object of the present disclosure is achieved by the subject matter of the independent claims. Other embodiments of the present disclosure are specified in the dependent claims. 
         [0013]    According to the present disclosure, a single-pole wall feedthrough is provided, which is pluggable on one side for connecting a voltage-carrying cable of a solar generator to a connection box housing, in particular a housing of a combiner box. The wall feedthrough comprises an insulating connector housing with an external stop or abutment collar and a mounting portion, e.g. a threaded portion. The connector housing is mounted in an opening in a wall of the combiner box housing by means of a separate mounting element that cooperates with the mounting portion, for example by screwing a mounting nut to the threaded portion of the connector housing, and the wall of the combiner box housing is clamped between the stop and the mounting element. 
         [0014]    Further, the connector housing is formed at least in two parts. As a first part, the connector housing comprises a front housing part that extends outwards from the combiner box housing, comprising a front side plug-in portion in form of a housing plug pin or a housing plug socket, a body sleeve for being inserted into an opening of the wall of the connection box housing or of the combiner box housing, and a stop collar arranged between the plug-in portion and the mounting portion of the body sleeve, wherein the connector housing is fixed in the opening, particularly screwed, with the stop collar on the one side and the mounting element on the other side. As a second part, the connector housing comprises a plastic insert part which is inserted into the preferably one-piece front housing part at a rear axial end thereof opposite to the plug-in portion. 
         [0015]    A metallic electric terminal element axially extends within the connector housing, which terminal element comprises a front metal plug-in terminal or contact and a rear clamping device for a stripped conductor end. The rear clamping device, in particular in form of a spring-force clamp, enables to reversibly and non-destructively release and reconnect the stripped conductor end. The stripped conductor end is electrically connected to the metal plug-in terminal by means of the terminal element which in the installed state extends through the opening transversely through the housing wall, when the conductor end is firmly clamped in the clamping device, so as to electrically connect the conductor in the installed and assembled state in the combiner box housing with a mating connector outside the combiner box housing. 
         [0016]    The electric terminal element is fixed within the preferably one-piece plastic insert part, e.g. latched. The insert part is guided slideably along its longitudinal extension in the body sleeve, so that the insert part together with the electric terminal element fixed therein can be reversibly inserted (pushed in) and retracted (pulled out) as a unit between a closed state of the connector housing when inserted into the body sleeve and a retracted open state of the connector housing. 
         [0017]    In the closed state of the connector housing, the clamping device is surrounded by the front housing part or the rear body sleeve thereof, so as to be completely enclosed, and the metal plug-in terminal is arranged in the front plug-in portion of the front housing part, so that it can be mated with a complementary metal plug-in terminal of the complementary mating connector. 
         [0018]    When opening the connector housing, the insert part is retracted rearwardly out of the front housing part to a certain extent, typically a few centimeters, together with the terminal element fixed therein. Thus, in the open state of the connector housing the metal plug-in terminal is at least partially pulled out rearwardly from the plug-in portion, and the clamping device is pulled out from the body sleeve to such an extent that it can be opened and closed by the user. When using a spring-force clamp, the latter is pulled out from the body sleeve at least to an extent that the clamping spring can be opened and closed by the user. 
         [0019]    For connecting the rear stripped conductor end in the open state, the conductor end is therefore inserted from the rear into the clamping device which is in particular designed as a spring-force clamp, subsequently the clamping device is closed and then the insert part is re-inserted into the front housing part in the direction towards the plug-in portion, in order to close the connector housing. Thus, the wall feedthrough may be freely assembled (cut to length and terminated) by the user. The spring-force clamp may optionally be configured in such a way that the stripped conductor end can be inserted not only into the opened but also into the closed spring-force clamp. This is often referred to as a direct plug-in technology. Such a spring-force clamp with direct plug-in technology is described, for example, in DE 10 2008 061 268, which is hereby incorporated by reference. The insertion of the insert part into the front housing part and the retracting from the front housing part may be performed reversibly when in the installed state in the wall opening of the combiner box housing. 
         [0020]    Thus, the wall feedthrough comprises a plug-in connector at one of its two axial ends, and at the other axial end a spring-force clamp enclosed in the connector housing, but retractable. 
         [0021]    Thus, the wall feedthrough may be reversibly disconnected and reconnected on both sides, on the outer side of the combiner box housing by means of the plug-in connector, and on the inner side of the combiner box housing by means of the spring-force clamp that can be pulled out from the front housing part, and both in the installed state. 
         [0022]    Further, a short configuration can be achieved, so that the space requirement in the combiner box housing is relatively low. Nevertheless, the wall feedthrough is very easily operated by the user, can freely be assembled (cut to length and terminated) and provides reliable contact. 
         [0023]    In addition, the leverage forces on the wall feedthrough screwed tightly into the opening are relatively low, due to the short configuration thereof both on the inner side of the combiner box housing and on the outer side of the combiner box housing. 
         [0024]    Finally, the wall feedthrough can be compatibly integrated into an existing photovoltaic pluggable connector system, and some components can be taken from the existing connector system or only need to be slightly modified. 
         [0025]    Preferably, the terminal element is tapering between the clamping device and the metal plug-in terminal, and the front housing part has a complementary taper of the inner passage in which the terminal element is axially moved or displaced. In the closed state of the connector housing, due to the mutual engagement of the tapered sections the terminal element is joined relatively water-tightly to the front housing part. More preferably, the terminal element is stamped from sheet metal material and has a hollow shape, and a plastic stopper is inserted into the hollow male metal plug-in terminal, as a contact protection. 
         [0026]    Preferably, the body sleeve comprises a rear sleeve portion at its end axially opposite to the plug-in portion of the front housing part, so that the mounting portion is arranged between the sleeve portion and the stop collar. In the closed state, the rear clamping device is preferably at least partially enclosed by the rear sleeve portion. The greater part of the overall length of the wall feedthrough can thus be arranged on the inner side of the combiner box housing in the closed state. In other words, the axial length of the mounting portion, the sleeve portion and a handle portion of the insert part in total is greater than or equal to the length of the plug-in portion or greater than or equal to the total length of that portion of the connector, which protrudes on the outer side of the housing wall in the installed state. 
         [0027]    In this way, relatively large leverage forces on the external plug connector can be absorbed. 
         [0028]    Preferably, the insert part has an intermediate portion in the region of the clamping device, which has a substantially U-shaped cross section and which radially opens to at least one side. Further, the clamping device is preferably formed as a spring-force clamp that is radially actuatable relative to the connector housing and includes a support frame and a clamping spring pivotally mounted in the support frame. The spring-force clamp, more precisely the support frame thereof, is preferably fixed in the intermediate portion in such a manner that the clamping spring is radially exposed through the radially opening side of the U-shaped cross section for being actuated, so that the spring-force clamp can be reversibly opened and closed by the user when the connector housing is in the open state. 
         [0029]    Thus, the clamping device is very easily operated by the user, even if the wall feedthrough is screwed tightly into the opening of the combiner box housing. 
         [0030]    According to a preferred embodiment, the clamping spring and the support frame of the spring-force clamp comprise mutually complementary latching means, by means of which the clamping spring is latched with the support frame in the closed state of the spring-force clamp, whereby a high contact reliability of the clamping device is guaranteed. 
         [0031]    In the closed state of the spring-force clamp and the connector housing, in addition to the latching with the support frame, the clamping spring is preferably enclosed by the body sleeve so tightly that the sleeve body prevents the clamping spring from springing open. As a result, the contact reliability can be further increased and the installation size can be kept small. 
         [0032]    In particular, the clamping spring comprises an actuating arm for being actuated by a finger of a user, a clamping arm for clamping the stripped conductor end to a power rail of the support frame, and an elbow portion, which connects the actuating arm to the clamping arm. Further, preferably, in the region of the elbow portion the clamping spring is pivotally mounted in the support frame. In the closed state, the actuating arm is latched with the support frame, for example by lateral latching protrusions on the actuating arm, which latch with latching hooks on the support frame. The actuating arm and the clamping arm extend from the pivot axis towards the plug-in portion (forwardly), and the actuating arm is secured from springing open by the body sleeve in the closed state, because the actuating arm engages the inner surface of the body sleeve, preferably in the region of the threaded portion in the axial direction. Preferably, the clamping arm is configured to be elastically resilient to an extent so that even in the closed state of the spring-force clamp, the stripped conductor end can be inserted from the rear, with the clamping arm giving way (direct plug-in technology), whereby a high level of operating comfort is achieved through different operation possibilities. 
         [0033]    According to an embodiment of the present disclosure, the insert part has a rear handle portion or grasp portion at its rear end (arranged axially opposite to the plug-in portion of the connector housing), on which the user can hold or grasp the insert part to insert it into the body sleeve and pull it out from the body sleeve. For this purpose, the handle portion preferably has an at least partially circumferential outer corrugation. Hereby, the insertion and retraction of the insert part into or from the front housing part is facilitated. 
         [0034]    In particular, the handle portion integrally formed with the plastic insert part defines the rear end of the wall feedthrough and is exposed, even in the closed state of the connector housing. In other words, a rear sleeve nut can be dispensed with. 
         [0035]    Preferably, in the closed state of the connector housing the handle portion is axially adjacent to the sleeve portion of the body sleeve. If applicable, the handle portion directly adjoins the sleeve portion, so that the rear end of the sleeve body forms a stop for the handle portion when inserted. 
         [0036]    The outer diameter of the handle portion, in particular of the corrugation, should be selected smaller than or equal to the diameter of the mounting portion of the body sleeve, so that the connector housing can be inserted with the insert part inserted in the front housing part, together as a pre-assembled unit, through the opening in the wall of the combiner box housing. Preferably, in the closed state of the connector housing, the handle portion or the outer diameter of the corrugation on the outer side flushes with the sleeve portion of the body sleeve. 
         [0037]    This has the advantage that the front housing part and the insert part may already be assembled at the factory and may be delivered to the customer and/or mounted as a pre-assembled combined module. 
         [0038]    Preferably, the handle portion has an inner insertion funnel for the conductor end at its (rear) end axially opposite to the plug-in portion of the front housing part, which tapers in the direction towards the clamping device. Thereby, the insertion of the stripped conductor end can be facilitated. 
         [0039]    For good guidance of the insert part when being inserted and retracted, at least one retaining tab extends axially rearwards from the rear end of the body sleeve and slides along a sliding surface of the insert part when the insert part is moved in the body sleeve. Preferably, the corrugation of the handle portion is interrupted on the sliding surface, and in the closed state the retaining tab axially extends into the corrugation. In this manner, the overall length can be kept small. 
         [0040]    In the closed state of the connector housing, the insert part is latched with the front housing part. Thereby, unintended retraction of the insert part from the front housing part is prevented, without an additional screw connection being necessary, for example. 
         [0041]    For this purpose, at least one retaining tab preferably has an opening which in the closed state is latched to a rear latching protrusion in the sliding surface. Further, preferably, at least one retaining tab has an opening, which in the open state is latched to a front latching protrusion arranged in the sliding surface. In this way, both the open and the closed state are secured against accidental displacement of the insert part relative to the front housing part, because first the latching has to be released or overcome. 
         [0042]    According to one preferred embodiment of the present disclosure, at least two radially opposed retaining tabs extend axially rearwards from the rear end of the body sleeve and slide along two radially opposed sliding surfaces of the insert part when the insert part is displaced in the body sleeve. However, only one of the sliding surfaces has a rear latching protrusion. 
         [0043]    Thus, the user may release the latching in the closed state of the connector housing with only one single manipulation, for example using a tool such as a screwdriver, so that release of the latching is simplified. 
         [0044]    The directional terms “front”/“front side” or “rear”/“rearwards” refer to the longitudinal axis of the wall feedthrough which in the installed state extends transversely to the wall of the combiner box housing. “Front” or “front side” refer to the side with the plug-in portion which is typically arranged on the outer side of the combiner box housing, and “rear” or “rearwards” refer to the side of the wall feedthrough axially opposite to the plug-in portion, where the clamping device is arranged and which is typically arranged on the inner side of the combiner box housing. 
         [0045]    The present disclosure will now be explained in more detail by way of exemplary embodiments and with reference to the figures, wherein identical and similar elements are partly provided with the same reference numerals, and wherein the features of the different exemplary embodiments may be combined with each other. 
     
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         [0046]    In the drawings: 
           [0047]      FIGS. 1   a  to  1   j  are different views of a wall feedthrough according to the present disclosure with a female plug-in terminal in the open state, as follows: 
           [0048]      FIG. 1   a  is a perspective view obliquely from the rear right; 
           [0049]      FIG. 1   b  is a perspective view obliquely from the rear left; 
           [0050]      FIG. 1   c  is a bottom view; 
           [0051]      FIG. 1   d  is a right side view; 
           [0052]      FIG. 1   e  is a top view; 
           [0053]      FIG. 1   f  is a left side view; 
           [0054]      FIG. 1   g  is a sectional view taken along line A-A in  FIG. 1   f;    
           [0055]      FIG. 1   h  is a rear view; 
           [0056]      FIG. 1   i  is a front view; 
           [0057]      FIG. 1   j  is a sectional view taken along line B-B in  FIG. 1   i;    
           [0058]      FIG. 2   j  is a sectional view similar to  FIG. 1   j , with the spring-force clamp closed and the conductor inserted; 
           [0059]      FIG. 3   j  is a sectional view similar to  FIG. 2   j , but with the connector housing closed; 
           [0060]      FIG. 4   a  is a perspective view obliquely from the rear right, of wall feedthrough complementary to  FIGS. 1-3 , with a male plug-in terminal; 
           [0061]      FIG. 4   d  shows the wall feedthrough of  FIG. 4   a  in a side view from the right; 
           [0062]      FIG. 4   j  is a longitudinal section similar to  FIG. 3   j , but through the wall feedthrough according to  FIG. 4   a  and  FIG. 4   d;    
           [0063]      FIG. 5   a  is a perspective view obliquely from the rear right, of the front housing part of the wall feedthrough of  FIG. 4   a , with a mounting nut; 
           [0064]      FIGS. 6   a  to  6   f  are different views of the insert part for the wall feedthrough of  FIG. 4  with a fixed male terminal element, as follows: 
           [0065]      FIG. 6   a  is a perspective view obliquely from the rear right; 
           [0066]      FIG. 6   b  is a perspective view obliquely from the front left; 
           [0067]      FIG. 6   c  is a bottom view; 
           [0068]      FIG. 6   d  is right side view; 
           [0069]      FIG. 6   e  is a top view; 
           [0070]      FIG. 6   f  is a left side view; 
           [0071]      FIG. 7  illustrates a combiner box housing with a plurality of installed wall feedthroughs according to the present disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0072]      FIGS. 1   a  to  1   j  show an electrical wall feedthrough  1  according to the present disclosure with a female plug-in terminal or contact. The wall feedthrough  1  comprises a two-part connector housing  102  which consists of a front housing part  104  with a front plug-in portion and a rear insert part  106  which is inserted into the front housing part  104  from the rear and is slidable along a longitudinal axis  3  of wall feedthrough  1  (axially) in the front housing part  104 . The one-piece front housing part  104  comprises a front plug-in portion  144  and a rear body sleeve  110 , and a stop collar  107  arranged between the plug-in portion  144  and the body sleeve  110 . Body sleeve  110  is divided into an outer thread rearwardly adjoining stop collar  107 , and a sleeve portion  112  rearwardly adjoining threaded portion  108 . Accordingly, the body sleeve  110  mainly consists of threaded portion  108  and smooth sleeve portion  112  which extends the threaded portion  108  to the rear. 
         [0073]      FIG. 1   j  shows the wall feedthrough with the connector housing open and the spring-force clamp open. The terminal element  114  is latched into the insert part  106  by means of two latching hooks  116  of insert part  106  and thus secured and fixed. Terminal element  114  consists of a front plug-in terminal  118  and a rear spring-force clamp  120 . The support frame  122  of spring-force clamp  120  is stamped and formed integrally with plug-in terminal  118 , the support frame  122  being substantially U-shaped and the plug-in terminal  118  has a hollow shape. Spring clamp  124  is pivotally mounted about a transverse pivot axis  125  in support frame  122  and comprises an actuating arm  126 , a clamping arm  128  and an elbow portion  130  connecting the two arms  126 ,  128 . 
         [0074]    The stop collar  107  has an annular rear stop surface  107   a . The wall feedthrough  1  is inserted into the opening  134  of housing wall  131  with the insert part  106  and the body sleeve  110 , and is then fixed with mounting nut  132 . In this installed state, the wall  131  is clamped between stop surface  107   a  of stop collar  107  and mounting nut  132 , in order to fix the wall feedthrough in the opening  134  in wall  131 . Wall feedthrough  1  is sealed with an O-ring  133  around body sleeve  110  between stop collar  107  and mounting nut  132 . For this purpose, the threaded portion  108  extends from the rear almost directly up to the stop surface  107   a  of stop collar  107 . 
         [0075]    Referring to  FIG. 2   j , the stripped conductor end  136  is inserted from back into the spring-force clamp  120 , and the user may close the clamping spring  124  from above through the radial opening  138  of the U-shaped intermediate portion  140  of insert part  106 , for example with a touch of a finger, whereupon the clamping spring  124  is latched in support frame  122 . Subsequently, the insert part  106  is inserted by the user into the passage  142  in the front housing part  104 , with the terminal element  114  fixed therein, whereby at the same time the plug-in terminal  118  is automatically inserted into the front plug-in portion  144 . The integrally molded plastic insert part  106  with the terminal element  114  fixed therein forms a unit which is shifted as a whole relative to the front housing part  104 . 
         [0076]    When inserting the insert part  106  into the front housing part  104  from the open to the closed state of connector housing  102 , the spring-force clamp  120  is displaced from a position behind and outside the body sleeve  110  into the body sleeve  110 , namely in this example at least partially up into the threaded portion  108 . In the closed state of the connector housing  102 , the spring-force clamp  120  axially extends up into the threaded portion  108 , or more precisely, the spring-force clamp  120  is arranged at an axial position within the sleeve portion  112  and the threaded portion  108 . 
         [0077]      FIG. 3   j  shows the inserted state of the insert part  106 , i.e. the closed state of connector housing  102  in which a mating connector, not shown, may be connected to wall feedthrough  1 . The terminal element  114  has a tapering area  146  between plug-in terminal  118  and spring-force clamp  120 , which tapers towards the front and which in the closed state of the connector housing  102  is arranged in the tapered area  148  of front housing part  104 . 
         [0078]    For inserting the insert part  106  into the passage  142  which axially extends through the front housing part  104 , the insert part  106  has a rear handle portion  150  adjacent the intermediate portion  140 . Handle portion  150  has a substantially circular cylindrical shape. The diameter of handle portion  150  is larger than the inner diameter of the passage  142  in front housing part  104 , so that the handle portion  150  cannot slide into the front housing part  104 . Furthermore, the handle portion  150  has a handle surface  151  on its outer circumference, which extends circularly around longitudinal axis  3 , at least partially, with an interrupted circularly extending corrugation  152 . Thus, the user may easily grip the handle portion  150  between his thumb and forefinger, in the open and in the closed state of connector housing  102 , in order to insert (push in) the insert part  106  into passage  142  of front housing part  104  and also to retract it (pull it out). Both is possible in the installed state in wall opening  134 , if applicable even when the mating connector, not shown, is plugged. Thus, the user can at any time pull out the insert or plug part  106  from front housing part  104  until the spring-forced clamp  120  is released, and can open the spring-force clamp  120  in this open state of the connector housing  102  in order to release the conductor end  136 . Thus, a conductor end  136  may be repeatedly connected and disconnected for an almost unlimited number of times, or the conductor  135  may be freely assembled (cut to length and terminated), reversibly connected and replaced at any time. 
         [0079]    The mounting nut  132  is relatively short in the axial direction. As such, the mounting nut  132  has an axial length which is shorter than the length of the body sleeve  110  as measured from the stop collar  107  to the rear end  104   a  of front housing part  104 . In the exemplary embodiment shown, the length of the mounting nut  132  is only about a quarter of the length of the body sleeve  110  as measured from the stop collar  107  to the rear end  104   a  of front housing part  104 . In the closed state of connector housing  102 , mounting nut  132  and threaded portion  108  are axially in the front area of spring-force clamp  120 . In particular, in the installed state, mounting nut  132  does not extend rearwards up to the handle portion  150  and especially not beyond the rear end  150   a  of handle portion  150 , so that the handle portion  150  is freely accessible to the user. Mounting nut  132  or the mounting element is merely an ordinary nut and in particular no hat-shaped screw cap with an inner thread. Hence, the mounting element in particular does not have the function to close the connector housing  102  at the rear end. 
         [0080]    Handle portion  150  has a front stop  153  which in the closed state of the connector housing  102  abuts on the rear side  110  of body sleeve  110 . Thus, the handle portion  150  of the insertion part  106  protrudes from the front housing part  104  or from the body sleeve  110  both in the open and the closed state of the connector housing  102  and thus is exposed, so that it can be gripped by the user. Accordingly, even in the closed state the insert part  106  will not be completely enclosed by the connector housing  102 . Consequently, the handle surface  151  of handle portion  150  is freely accessible to the user in the open and in the closed state of the connector housing  102 , in particular it can be gripped from two radially opposite sides. 
         [0081]    Referring again to  FIGS. 1   a  and  1   b , the actuating arm  126  of clamping spring  124  has two lateral latching tabs  154  that engage under latch hooks  156  of the lateral edges  158  of support frame  122 . This latching may be levered open via an opening  160  stamped into the actuator arm  126 , so that the spring force clamp can be reversibly closed and opened by the user. 
         [0082]    Referring again to  FIG. 3   j , in the closed state of connector housing  102 , the actuating arm  126  of clamping spring  124  is secured from springing open by engaging the inner surface  142   a  of passage  142 , in addition to the latching with support frame  122 . 
         [0083]    The outer diameter of handle portion  150  or of the transverse corrugation  152  is approximately equal to the outer diameter of sleeve portion  112 , to facilitate insertion of the pre-assembled connector housing  102  into the wall opening  134 . In other words, the outer surface of sleeve portion  112  extends substantially flush with the handle portion  150 . 
         [0084]    For easy insertion of the conductor end  136 , the handle portion  150  has a rear inner insertion funnel  162  which tapers from rear to front. Insertion funnel  162  is rigid and does not need to fulfill a clamping function. The clamping of conductor  135  within the combiner box housing is exclusively effected using spring-force clamp  120  which clamps the stripped conductor end  136  against the power bar or power rail  123  of support frame  122 . Therefore, conductor  135  lies loosely in insertion funnel  162 . 
         [0085]    Referring again to  FIGS. 1   d  and  1   f , the front housing part  104  has rear retaining tabs  164   a,b  rearwardly directly adjacent to sleeve portion  112 . When the insert part  106  is moved or shifted, retaining tabs  164   a,b  slide on sliding surfaces  166   a,b  on both sides of insert part  106 . Sliding surfaces  166   a,b  extend axially at least over the intermediate portion  140  and up into the corrugation  152  which is interrupted on sliding surfaces  166   a,b  for this purpose. Each of retaining tabs  164   a,b  comprises a respective latching opening  168   a,b . Sliding surfaces  166   a,b  have front lateral latching protrusions  176   a,b  which in the open state of the connector housing ( FIG. 1   a  to  1   j ) are latched in openings  168   a,b  of retaining tabs  164   a,b . However, only one of the two sliding surfaces  166   a,b , in this example the left-hand sliding surface  166   b  as seen from the rear, has a rear latching protrusion  170   b  which in the closed state of the connector housing is latched in opening  168   b  of the left retaining tab  164   b  when the connector housing  102  is closed. The only one-sided latching in the closed state may be released with only a single manipulation. For this purpose, the insert part  106  includes a recess or groove  172   b  behind the rear latching protrusion  170   b , for inserting a screwdriver and levering open the latching between opening  168   b  and rear latching protrusion  170   b.    
         [0086]      FIGS. 4   a ,  4   d  and  4   j  show a complementary wall feedthrough  2  comprising a terminal element  214  with male plug-in contact or terminal  218 . The plug-in terminal  218  formed from sheet metal material is closed with a plastic stopper  219  which serves as a contact protection. Otherwise, the male wall feedthrough  2  is configured similar to the female wall feedthrough  1 , and corresponding parts are designated with reference numerals that have 200 numbers instead of 100 numbers, and the ones and tens digits are chosen to be equal. 
         [0087]      FIG. 5   a  shows the front housing part  204  of the male wall feedthrough  2 . 
         [0088]      FIGS. 6   a  to  6   f  show the insert part  106  with male terminal element  214  fixed therein. The inner geometry of passages  142 ,  242  of both wall feedthroughs  1 ,  2  has the same shape as far as it cooperates with the insert part  106 , so that the same plastic insert part  106  can be used both for the male terminal element  214  or male wall feedthrough  2  and for the female terminal element  114  or female wall feedthrough  1 . So only one type of insert parts  106  for both wall feedthroughs  1  and  2  (male and female) needs to be manufactured and stocked, so that costs can be saved. 
         [0089]    The insert part  106  further has a front retaining portion  173  with two radially opposed, cantilevered and resilient front guide tabs  174  which extend the two sliding surfaces  166   a,b  towards the front and guide the insert part  106  in the passage  142  of front housing part  104 . The front latching protrusions  176   a,b  are arranged on the outer surfaces of guide tabs  174  and engage in latching openings  168   a,b  of front housing part  104  when the insert part  106  is retracted, in order to prevent the insert part  106  from completely being pulled out. In the illustrated example, the front latching protrusions  176   a,b  will latch in openings  168   a ,  168   b  of retaining tabs  164   a ,  164   b , whereby a particularly short design can be achieved. 
         [0090]    Thus, the insert part  106  consists of three portions, the front retaining portion  173  which remains in the front housing part  104  even in the open state, the intermediate portion  140  which can be inserted into the front housing part  104  and retracted from the front housing part  104 , and the handle portion  150  which cannot be inserted into the front housing part  104 . The three portions are integrally made of plastic. 
         [0091]    Referring again to  FIG. 3   j ,  4   j , in the installed and closed state of the connector housing, the rear part (which in the installed state is arranged on the inner side  4   a  of combiner box housing  4 ) comprising threaded portion  108 ,  208 , sleeve portion  112 ,  212 , and handle portion  150 , is longer than the plug-in portion  144 ,  244  on the outer side  4   b  of combiner box housing  4 . Furthermore, in the closed state of the connector housing  102 , the clamping device  120  is arranged at least mostly rearwards of stop collar  7 , or in the installed state on the inner side  4   a  of combiner box housing  4  ( FIG. 7 ). Between stop collar  107 ,  207  and housing plug pin  105  or housing plug socket  205 , the plug-in portion  144 ,  244  further has an outer polygonal geometry  180 ,  280 , in order to hold the front housing part  104  against rotation when tightening the mounting nut  132 ,  232 , e.g. using a wrench. 
         [0092]    The insert part  106  comprises a front guiding portion  178  with two guide tabs  174 , an intermediate portion  140  having a substantially U-shaped cross section for accessing clamping spring  124 , and the rear substantially cylindrical handle portion  150 , which are integrally molded as one part. 
         [0093]    The plug-in terminal  118 ,  218  protrudes, substantially completely, from the front end  106   b  of insert part  106  opposite the rear end  106   a  of insert part  106  or the rear end  150   a  of handle portion  150 , so that it can be inserted into plug-in portion  144  or  244 . 
         [0094]    The cantilevered guide tabs  174  form a front portion  184  of the sliding surface and extend the sliding surfaces  166   a,b  towards the front. Each front portion  184  of the sliding surface is separated from the associated sliding surface  166   a,b  by a respective narrow gap  182 . Otherwise, the displacement of insert part  106  relative to the front housing part  104  is guided by retaining tabs  164   a,b  on the one hand, and by sliding surfaces  166   a,b  including the front portion  184 , in order to accomplish a good linear guidance over the entire displacement range of the insert part  106  within front housing part  104  from the open to the closed state of connector housing  102 . 
         [0095]      FIG. 7  schematically shows the installation of a plurality of wall feedthroughs according to the present disclosure in the wall  131  of a connection or combiner box housing  4 . 
         [0096]    It will be apparent to those skilled in the art that the embodiments described above are intended as examples and that the invention is not limited thereto, but may be varied in many ways without departing from the scope of the claims. Furthermore, the features also define individually significant components of the present disclosure, irrespective of whether they are disclosed in the description, the claims, the figures, or otherwise, even if they are described together with other features.