CN109314354B

CN109314354B - Threading terminal

Info

Publication number: CN109314354B
Application number: CN201780040763.0A
Authority: CN
Inventors: C.克洛彭堡; D.哈比罗夫; J.布拉赫特
Original assignee: Phoenix Contact GmbH and Co KG
Current assignee: Phoenix Contact GmbH and Co KG
Priority date: 2016-06-28
Filing date: 2017-06-06
Publication date: 2020-07-14
Anticipated expiration: 2037-06-06
Also published as: EP3476011A1; CN109314354A; EA201990108A1; LU93126B1; EP3476011B1; EA035781B1; ES2979221T3; WO2018001682A1

Abstract

A feedthrough terminal (1) for mounting in a wall opening (2) of a housing wall (3) is shown and described, having a terminal housing (5) with an inner section (3) and an outer section (4), wherein connecting elements (6, 7) are arranged in the inner section (3) and in the outer section (4), respectively, and the two connecting elements (6, 7) are connected to each other in an electrically conductive manner, and having a fastening device which can be brought from a release position into a fastening position in which the terminal housing (5) is fastened in the wall opening (2). In the inventive lead-through terminal (1), a secure fastening of the lead-through terminal (1) in the wall opening (2) is thereby achieved in a simple handling, such that the fastening device has an elastic fastening element (10) and a pivotable handling part (11), wherein the fastening element (10) is fastened with its first end (12) on the outer section (5) of the terminal housing (6) and, in the mounted state of the lead-through terminal (1), protrudes with its free second end (13) into the wall opening (2), wherein a clamping surface (14) is formed on the second end (13) of the fastening element (10), and wherein the handling part (11) is connected to the terminal housing (6) by means of a flexible connecting piece (15) and can be pivoted from a first position into a second position and, in the second position of the handling part (11), the fastening element (10) is deflected such that, in the mounted state of the feedthrough terminal (1), the second end (13) of the fastening element (10) acts with its clamping surface (14) against the inner edge (16) of the wall opening (2).

Description

Threading terminal

Technical Field

The invention relates to a feedthrough terminal for mounting in a wall opening in a housing wall, having a terminal housing with an inner section and an outer section, wherein connecting elements are arranged in the inner section and in the outer section, respectively, and having a fastening device which can be brought from a release position into a fastening position in which the terminal housing is fastened in the wall opening.

Background

Electrical connection panels (Reihenklemmen) have been known for decades and are used in millions in the connection of electrical installations and devices. The terminals are often locked on a carrier rail, which itself can be arranged in plurality in the switch cabinet. In addition, however, the terminal block can also be fastened, individually or in general in multiple pieces, as a terminal block in a wall opening of a housing wall, in particular in an opening in a wall of a switch cabinet. This has the advantage that the side of the terminal, the operator side or the front side can be accessed from outside the switch cabinet without having to open the switch cabinet. However, the other side, the connection side or the back side of the terminal is only accessible when the switch box is open.

In particular, screw terminals, tension spring terminals or leg spring terminals are used as connecting elements in terminal blocks. The clamping principle in tension spring terminals is similar to that of the screw technique. The tension sleeve pulls the conductor towards the current bar in the threaded terminal by operating the clamping screw, while in the tension spring terminal the tension spring takes on this task. However, in the leg spring terminal, the conductor with the insulation removed (abisolieren) is pressed against the current bar by the clamping leg of the spring. The leg spring terminal has the advantage that the rigid conductor, which has been freed of insulation, can be connected directly to the terminal without tools by inserting the conductor into the clamping point between the end of the clamping leg and the current bar. Furthermore, as connecting elements, it is also possible to use connecting pins or connecting bushes to which corresponding connecting bushes or connecting pins can then be connected.

Electrical connection boards are usually connection terminals, so that they have at least two connection elements, which are usually connected to one another in an electrically conductive manner by means of current bars arranged in a terminal housing. In addition to this basic type of terminal block (also referred to as through terminal in general), there are also various different terminal block types which are adapted in particular to the respective application. As examples, a protection conductor terminal, a separation terminal, and a mounting terminal may be mentioned. Irrespective of the type of terminal and the connecting element used in the terminal, a terminal block, a so-called lead-through terminal, which is fastened in a wall opening, has special significance for a simple mounting and secure mechanical fixing of the terminal in the wall opening, for which different fastening devices are known from the prior art.

DE 19801260 a1 discloses a one-piece feedthrough terminal in which a one-piece terminal housing is guided through a wall opening as far as a stop, and the locking bracket is then pushed onto the component guided through the wall opening. The locking bracket is locked with two opposite sides of the terminal housing, so that a housing wall, in which the wall opening is formed, is fixed between the stop on one side and the locking bracket on the other side. The disadvantage here is that the installation space required for the feedthrough terminal is increased by the locking bracket. Furthermore, there is a risk that: that is, the fitter loses the locking bracket when mounting and then finds it again in the switch cabinet without or with only difficulty.

EP 1333544B 1 also discloses a feedthrough terminal in which a one-piece terminal housing is inserted through a wall opening of the housing, wherein spring latches provided on two opposite sides of the housing are each pressed back against an inner edge of the wall opening when the terminal housing is inserted through the wall opening. In order to finally fix the terminal in the wall opening, the spring lock must be prevented from rebounding again due to the blocking slide which operates from the inside of the housing, while the terminal must first be pushed in from the outside of the wall opening. The construction space required for the lead-through terminals is also increased by the blocking slide. Furthermore, there is a risk that: that is, the end of the blocking slide projecting beyond the feedthrough terminal is hooked onto a conductor arranged inside the switch box.

DE 202010010424U 1 discloses a wall feedthrough terminal having a one-piece terminal housing, wherein a stop is formed on an outer section of the terminal housing. A locking device (veriegengening senrichtung) is provided on the inner section of the terminal housing, which locking device has a locking element with a clamping surface, with which the locking element in the secured position is pressed against an edge of the upper edge of the wall opening. The locking element can be moved on a rail formed on the upper side of the inner section of the terminal housing, wherein a latching means is formed between the rail and the locking element.

DE 10315661 a1 discloses a wall feedthrough terminal or terminal block which can be fastened in a wall opening by means of two locking elements arranged on the side of the terminal block, the locking elements being configured in a U-shape and each having a pivotable actuating wedge which presses two legs of the locking element against an inner edge of the wall opening in the locking position, although an easy fastening and loosening of the terminal block in the wall opening can be achieved with these locking elements, the flexible locking element is susceptible to (anf ä llig gegen ü ber) twisting (Torsion) and can already be damaged by a slight incorrect guidance of the actuating tool.

Disclosure of Invention

The object of the invention is therefore to provide a fastening option for a feedthrough terminal and for a terminal block composed of a plurality of feedthrough terminals, which ensures reliable fastening of the feedthrough terminal in a wall opening with simple handling. Furthermore, the fastening device will make the construction space required for the lead-through terminals as little or as little as possible.

This object is achieved for the feedthrough terminal described at the outset with the features of claim 1 in that the fastening device has an elastic fastening element and a pivotable actuating part, which can interact with the actuating part. Both the fastening element and the actuating part are connected to the terminal housing, so that no separate component is provided which could be lost during installation. The fastening element is fastened with its first end to the outer section of the terminal housing, while the fastening element projects with its free second end into the wall opening in the mounted state of the feedthrough terminal. In this case, a clamping surface is formed on the second end of the fastening element, which clamping surface in the fastened position acts against an inner edge of the wall opening. The actuating part is connected to the terminal housing by a flexible web such that it can be pivoted from a first position into a second position. In the second position of the actuating part, the fastening element is deflected by the actuating part such that the second end of the fastening element is pressed with its clamping surface against the inner edge of the wall opening in the mounted state of the feedthrough terminal.

The feedthrough terminal according to the invention differs from the feedthrough terminals known from the prior art in that the fastening device does not have a separate component, such as a slide or a locking bracket, which increases the construction space required for the feedthrough terminal on the one hand and can be lost during installation on the other hand. In the lead-through terminal according to the invention, both elements of the fastening device, the elastic fastening element and the pivotable actuating part are connected with the terminal housing and are thus integrated into the lead-through terminal. In this way, for a terminal block consisting of a plurality of lead-through terminals, each lead-through terminal can be individually fixed in a wall opening. However, in general, it is sufficient if, in the case of a terminal block consisting of a plurality of lead-through terminals, only the fastening means of a portion of the lead-through terminals are brought into the fastening position in order to fix the terminal block in its entirety reliably in the wall opening.

In order to ensure that the feedthrough terminal always has a defined position when mounted in the wall opening, a stop is preferably formed on the outer section of the terminal housing, which stop rests against a housing wall bounding the wall opening in the mounted state of the feedthrough terminal. Such a position is therefore predefined by the stop, up to which the feedthrough terminal can be inserted or pivoted into the wall opening during installation. The stop element can be used to fix the terminal in the fastening position of the fastening element in the horizontal direction.

According to a further particularly preferred embodiment of the feedthrough terminal according to the invention, a lead-in chamfer is formed on the terminal housing on the side opposite the clamping surface of the actuating element, with which the terminal housing is seated (aufsitzt) on the inner edge of the lower part of the wall opening in the mounted state of the feedthrough terminal. The terminal housing is thus held in the mounted state not only by the clamping surface of the fastening element being pressed against the upper inner edge of the wall opening, but additionally is fixed by the terminal housing being pressed in the vertical direction with its insertion bevel against the lower inner edge of the wall opening.

Furthermore, the provision of the insertion ramp on the underside of the terminal housing also ensures a reliable pre-installation of the leadthrough terminal in the wall opening without the risk of the leadthrough terminal falling out of the wall opening if the fastening element has not yet been brought into the fastening position by the actuating part. For this purpose, the feedthrough terminal is pivoted into the wall opening and then lowered onto the insertion ramp. In this case, the inner section of the terminal housing is dimensioned accordingly, so that the lead-through terminal is prevented from falling out, even if the clamping surface of the second end of the fastening element does not interact with the inner edge of the wall opening. The beveled design furthermore allows the feedthrough terminal to be mounted in a wall opening of a housing wall, which has different material thicknesses to a certain extent.

In order to ensure a permanent and secure fixing of the feedthrough terminal in the wall opening, the actuating part can be fixed in its second position, in which it deflects the fastening element such that its clamping surface presses against the upper inner edge of the wall opening. This is advantageously achieved by: the fastening element has teeth on its second end on a surface opposite the clamping surface, that is to say on a surface facing the actuating part, and the actuating part has corresponding mating teeth on its surface facing the fastening element. This prevents the actuating element from being undesirably pivoted back from its second position into the first position. The toothing secured by corresponding ribs, for example, furthermore ensures that the fastening of the feedthrough terminal in the wall opening is not loosened or loosened even in the event of vibrations. In order to ensure a reliable and durable fixing of the feedthrough terminal in the wall opening, the clamping surface of the actuating element preferably additionally has a slip-preventing means, for which purpose the clamping surface can have, for example, ribs or corresponding projections or knots (Noppen).

In order to make it possible for the actuating part to be easily pivoted from its first position into its second position and in particular also pivoted back again from the second locking position into the first release position, the actuating part preferably has an insertion opening for an actuating tool at its free end. The actuating tool can be, for example, a screwdriver, the tip of which can be introduced into the insertion opening for pivoting the actuating element. In this way, the small actuating part can be easily and reliably pivoted by the assembler from its first position into its second position, and vice versa.

Generally, the lead-through terminal according to the invention is not separately fastened in the wall opening, even if this can be done substantially easily. In most cases, however, a plurality of such lead-through terminals together form a terminal block, for which purpose the disk-shaped lead-through terminals are connected to one another, in particular locked to one another. The terminal block thus formed can be simply fixed in a correspondingly dimensioned wall opening in such a way that the fastening elements of the individual feedthrough terminals or of all feedthrough terminals are brought into the fastening position by means of a corresponding actuating part.

In order to mechanically connect the individual feedthrough terminals to one another as a terminal block, the feedthrough terminals are usually locked together by means of locking elements formed on the terminal housing. The locking element is preferably formed here by a locking journal arranged on one side of the terminal housing and a corresponding locking recess formed on the other side of the terminal housing.

According to an advantageous embodiment of the terminal block, the terminal block has, in addition to the plurality of lead-through terminals, two closing elements which are fastened to the two end sides of the terminal block. In this case, insertion bevels are formed in the housing of the closure element, with which the housing is seated on the inner edges of the lower part of the wall opening in the mounted state of the terminal block. In this case, the insertion ramp is arranged in the closing element in such a way that it is aligned with the insertion ramp in the terminal housing of the feedthrough terminal. The closing element also serves as a housing cover for the external feedthrough terminal of the terminal block, so that the components guided in the terminal housing of the feedthrough terminal, i.e. the connecting element and the bus bar, are protected from contact.

Drawings

In particular, there are now a number of possible solutions for designing and improving the lead-through terminal or terminal block according to the invention. Reference is hereby made both to the

claims following claims

1 and 9 and to the following description of preferred embodiments in connection with the accompanying drawings. Shown in the drawings are:

fig. 1 shows a feedthrough terminal according to the invention viewed from one side;

fig. 2 shows the feedthrough terminal according to fig. 1 in the mounted state with an inserted handling tool;

fig. 3 shows an enlarged view of a part of the feedthrough terminal according to fig. 2, with a part of the housing wall;

fig. 4 shows the mounting of the terminal block in the wall opening in four steps, viewed from one side;

fig. 5 shows a terminal block according to the invention, which is composed of a plurality of lead-through terminals and two closing elements, obliquely from the rear side, and

fig. 6 shows the terminal block according to fig. 5 obliquely from the front side.

Detailed Description

Fig. 1 to 3 show a preferred embodiment of a feedthrough terminal 1 according to the invention for mounting in a wall opening 2 in a housing wall 3, which can be, for example, a switch cabinet door. The feedthrough terminal 1 has a one-piece terminal housing 6 with an inner section 4 and an outer section 5, wherein the inner section 4 penetrates (durchgestep) the wall opening 2 from the outside when the feedthrough terminal 1 is mounted. Then, in the mounted state of the lead-through terminal 1, the outer section 5 is on one side, on the outside of the wall opening 2, and the inner section 4 is on the other side, on the inside of the wall opening 2.

Two connecting elements 7, 8 are arranged in the terminal housing 6, which is usually designed as a plastic injection-molded part, by means of which the electrical conductors are each connected to the feedthrough terminal 1. In the feedthrough terminal 1 shown in the figures, two leg springs are provided as connecting elements 7, 8, by means of which the conductors to be connected are each clamped to a busbar 9. By means of the two leg springs 7, 8, the two conductors can be connected to each other in an electrically conductive manner via a busbar 9.

In order to fasten the feedthrough terminal 1 in the wall opening 2, the feedthrough terminal 1 has a fastening device which consists of an elastic fastening element 10 and a pivotable actuating part 11. The fastening element 10, which is embodied as a spring arm, is fastened with its first end 12 to the outer section 5 of the terminal housing 6 in such a way that the free second end 13 of the fastening element 10, in the mounted state of the feedthrough terminal 1, projects (hineniragt) into the wall opening 2 or through (hinkurargt) the wall opening 2, as can be seen in particular in fig. 3. In order to fix the feedthrough terminal 1 in the wall opening 2, a clamping surface 14 is formed on the second end 13 of the actuating element 10.

The wedge-shaped actuating part 11 is connected to the terminal housing 6 by means of a flexible web 15, so that the actuating part 11 can be pivoted from a first position shown in fig. 1, in which the actuating part 11 does not interact with the fastening element 10, into a second position shown in fig. 3, in which the actuating part 11 deflects the fastening element 10, so that the second end 13 is pressed with its clamping surface 14 against the upper inner edge 16 of the wall opening 2. In the illustrated lead-through terminal 1 according to the invention, therefore, both the fastening element 10 and the actuating part 11 are integrally connected to the terminal housing 6, which is usually produced as a plastic injection-molded part, and are thus integrated in the terminal housing 6.

The outer section 5 of the terminal housing 6 has a stop 17 which, in the mounted state of the feedthrough terminal 1, abuts against (ansto beta en) on the outside of the housing wall 3 surrounding the wall opening 2. Thus, by means of the stop 17 it is predefined how far the feedthrough terminal 1 can be inserted or pivoted into the wall opening 2 during installation. Furthermore, a recessed bevel 18 is formed on the side of the terminal housing 6 opposite the clamping surface 14 of the actuating element 10, with which the terminal housing 6 rests on a lower inner edge 19 of the wall opening 2 in the mounted state of the feedthrough terminal (fig. 4 d).

In order to ensure a permanent and secure fixing of the feedthrough terminal 1 in the wall opening 2, the clamping surface 14 of the fastening element 10 has an anti-slip means 20, which can be formed by a plurality of ribs formed on the clamping surface 14. Furthermore, the fastening element 10 has a toothing 21 on its second end 13 on a surface opposite the clamping surface 14, and the actuating part 11 has a corresponding counter toothing 22 on its surface facing the fastening element 10. This ensures that the actuating element 11 cannot be pivoted back undesirably from its second locking position. It is thereby also ensured that the clamping surface 14 of the fastening element 10 is permanently pressed against the upper inner edge 16 of the wall opening 2, so that no undesired loosening or sliding of the feedthrough terminal 1 in the wall opening 2 occurs.

In order to enable the actuating element 11 to be easily pivoted from the first position into the second position even in the case of relatively small dimensions of the feedthrough terminal 1, the actuating element 11 has an insertion opening 23 at its free end, into which the tip of a screwdriver (schraubenderreher) 24 as an actuating tool can be inserted. By means of the screwdriver 24, the actuating element 11 can also be released from the locked second position, so that the feedthrough terminal 1 can also be released again from the wall opening 2 if necessary.

As can be seen in particular from the enlarged illustration according to fig. 3, a lead-in chamfer (Einf ü hrschr ä ge) 25 is formed on the second end 13 of the actuating element 10, which lead-in chamfer in the mounted state of the leadthrough terminal 1 passes through the (hindurchragt) wall opening 2 or is arranged on the inside of the housing wall 3, it is ensured by the lead-in chamfer 25 that the free second end 13 of the actuating element 11 does not abut against the upper inner edge 16 of the wall opening 2 when the leadthrough terminal 1 is pivoted from the pre-mounted position (fig. 4 c) into the mounted position (fig. 4 d), as a result of which the mounting of the leadthrough terminal 1 can be prevented.

For simple mounting and handling of the feedthrough terminal, a grip recess (Griffmulde) 26 is also formed on each of the two opposite sides on the outer portion 5 of the terminal housing 6, so that the feedthrough terminal 1 or the terminal housing 6 can be easily held by the fitter with two fingers. Corresponding ribs can be formed in the grip recess 26 as anti-slip means, as can be seen in fig. 1. In the basic state of the feedthrough terminal 1 according to fig. 1, a thin retaining plate 27 is still arranged between the actuating element 11 and the inner section 4 of the terminal housing 6. The retaining tab 27 is present, on the one hand, as a function of manufacturing, and on the other hand serves to hold the actuating element 11 in a defined position in the basic state. Then, for a plurality of lead-through terminals 1 arranged alongside the terminal block 28, it can be easily recognized by the assembler whether the handling part 11 has been pivoted from its first position into its second position. Upon pivoting the actuating part 10, the thin retaining flap 27 is detached (abgetrennt) or sheared (abgescher) such that it does not prevent the desired pivoting movement of the actuating part 11 into the second position in which the actuating part 11 deflects the second end 13 of the fastening element 10.

Fig. 4 to 6 show a terminal block 28, which is composed of a plurality of feedthrough terminals 1 arranged next to one another and locked to one another and two closure elements 29 fastened to the end faces of the terminal block 28. The closing elements 29 are therefore arranged on the right and left sides of the two outer feedthrough terminals 1 and are locked thereto. The closing element 29 here has substantially the same contour as the feedthrough terminal 1, so that the closing element 29 also serves as a lateral housing wall or cover of the terminal block 28 or of the external feedthrough terminal 1.

The mounting of the terminal block 28 in the wall opening 2 will be briefly explained below with the aid of fig. 4a to 4 d. First, the terminal block 28 together with the inner section 4 of the individual feedthrough terminal 1 is inserted into the wall opening 2 from the outside shown on the right in fig. 4 (fig. 4 a) and then pivoted clockwise (fig. 4 b). In the pre-installed position according to fig. 4c, the individual feedthrough terminal 1 is seated with its insertion ramp 18 and the two closing elements 29 with their corresponding insertion ramps 30 are seated on the lower inner edge 19 of the wall opening 2. The terminal block 28 then no longer falls out of the wall opening 2 (herausfallen), since the terminal block 28 is prevented from sliding out in the outward direction by the insertion of the

bevels

18, 30. The terminal block 28 is prevented from tilting further in the clockwise direction by the inner section 4 of the individual feedthrough terminal 1, which abuts from the inside against the edge of the wall opening 2.

Subsequently, the terminal block 28 is pivoted counterclockwise until it is in the mounting position shown in fig. 4d, in which the second end 13 of the fastening element 10 of the individual feedthrough terminal 1 penetrates the wall opening 2. The fixing of the terminal block 28 in the wall opening 2 is then effected in such a way that all or individual fastening elements 10 with their clamping surfaces 14 are pressed against the upper inner edge 16 of the wall opening 2 by pivoting the respective actuating element 11 from the first position into the second position by means of a screwdriver, as is shown in fig. 2 and 3.

Fig. 5 and 6 each show a perspective view of the terminal block 28 secured in the wall opening 2 of the housing wall 3, wherein in fig. 5 the terminal block 28 is shown tilted from the rear, i.e., from the inside, and in fig. 6 the terminal block 28 is shown tilted from the front, i.e., from the outside. Here, conductor insertion openings 31, which are formed in the inner section 4 and the outer section 5 of the terminal housing 6, respectively, can also be seen, through which a conductor can be inserted into the terminal housing 6 from the inside or from the outside, respectively, for each feedthrough terminal 1, in such a way that the inserted conductor is pressed by the clamping legs of the leg springs 7, 8 against the current bar (Strombalken) 9 and thus the two conductors can be connected to one another in an electrically conductive manner.

Claims

1. Threading terminal (1) for mounting in a wall opening (2) in a housing wall (3), having a terminal housing (6) with an inner section (4) and an outer section (5), wherein connecting elements (7, 8) are arranged in the inner section (4) and in the outer section (5), respectively, and having a fastening device which can be brought from a release position into a fastening position in which the terminal housing (6) is fastened in the wall opening (2),

it is characterized in that the preparation method is characterized in that,

the fastening device has an elastic fastening element (10) and a pivotable actuating part (11),

the fastening element (10) is fastened with its first end (12) to the outer section (5) of the terminal housing (6) and with its free second end (13) in the mounted state of the terminal (1) protrudes into the wall opening (2), wherein a clamping surface (14) is formed on the second end (13) of the fastening element (10),

the actuating part (11) is connected to the terminal housing (6) by means of a flexible connecting piece (15) and can be pivoted from a first position into a second position, and

in a second position of the actuating part (11), the fastening element (10) is deflected such that, in the mounted state of the feedthrough terminal (1), a second end (13) of the fastening element (10) acts with its clamping surface (14) against an inner edge (16) of the wall opening (2), and in the second position of the actuating part (11), the fastening element (10) is deflected by the actuating part (11).

2. The feedthrough terminal (1) according to claim 1, characterized in that a stop (17) is configured on the outer section (5) of the terminal housing (2), which in the mounted state of the feedthrough terminal (1) rests against a housing wall (3) bounding the wall opening (2).

3. The feedthrough terminal (1) according to claim 1 or 2, characterized in that a lead-in chamfer (18) is formed on the terminal housing (6) on the side opposite the clamping surface (14) of the actuating element (10), with which lead-in chamfer the terminal housing (6) rests on the lower inner edge (19) of the wall opening (2) in the mounted state of the feedthrough terminal (1).

4. Threading terminal (1) according to claim 1 or 2, characterized in that the clamping surface (14) of the fastening element (10) has anti-slip means (20).

5. Threading terminal (1) according to claim 1 or 2, characterized in that the fastening element (10) has teeth (21) on its second end (13) on a surface opposite the clamping surface (14) and the operating part (11) has corresponding counter teeth (22) on its surface facing the fastening element (10).

6. The feedthrough terminal (1) according to claim 1 or 2, characterized in that the handling part (11) has an insertion opening (23) for a handling tool (24) on its free end.

7. The feedthrough terminal (1) according to claim 1 or 2, characterized in that a lead-in chamfer (25) is configured on the second end (13) of the fastening element (10), which lead-in chamfer penetrates through the wall opening (2) in the mounted state of the feedthrough terminal (1).

8. The feedthrough terminal (1) according to claim 1 or 2, characterized in that a handle groove (26) is formed on the outer section (5) of the terminal housing (6) on two sides lying opposite one another.

9. Terminal block (28) consisting of a plurality of feedthrough terminals (1) according to any of claims 1 to 8 arranged side by side and connected to one another.

10. The terminal block (28) as claimed in claim 9, characterized in that a closure element (29) is fastened to each of the two end sides of the terminal block (28), wherein a recess ramp (30) is formed in each case in the housing of the closure element (29), with which recess ramp the housing rests on the lower inner edge (19) of the wall opening (2) in the mounted state of the terminal block (28).