DE102007044262A1 - Terminal connection and installation switching device - Google Patents

Abstract

The invention relates to a clamping connection (10) for connecting a conductor (14) to an installation switching device (1), with a clamping spring (12) acting as a compression spring on the conductor end (16) for clamping the conductor end (16) to an abutment. It is characterized in that - the terminal connection (10) comprises a busbar (102) with a terminal end (112) and a subsequent discharge region (114), - that the busbar (102) at the terminal end (112) has a window-like recess (116 ) with a support edge (118) and a clamping edge (120) opposite the support edge (118) at the transition of the connection end (112) into the discharge region (114), - the clamping spring (12) has a support leg (212) with which it is supported on the support edge (118) of the busbar (102), - that adjoins the support leg (212) a curved piece (214) and a clamping leg (216), so that the conductor end (16) between the clamping leg (216 ) and the clamping edge (120) can be clamped as an abutment, and - that connects to the elbow a first part-clamping leg, which merges at a bending edge in a bent from the first part-clamping leg second part-clamping legs, so in that the first and the second partial clamping legs assume an obtuse angle with each other, the opening of which points in the direction of insertion of the connecting conductor.

Description

The The invention relates to a terminal connection for connecting a conductor to an installation switching device, with one as a compression spring acting on the conductor end clamping spring for clamping the conductor end on an abutment, according to the preamble of Claim 1. The invention further relates to a service switching device with a generic terminal connection.

From the EP 1 575 130 a generic terminal connection is known in which a plurality of insertion openings and a holding opening are present in a contact frame. The clamping spring is held at a first free end in the holding opening on the contact frame, and divided at its second free end by one or more slot-shaped recesses in a number of plug openings corresponding number finger-like extensions. Each of the extensions is guided through in each case one of the insertion openings and in each of the insertion openings of one of the extensions a conductor can be clamped. At the contact frame, a connection part for the attachment of another electrical outgoing conductor is formed in the switching device inside. The clamping spring is supported on a support edge at the transition between the contact frame and the connection part. The connection part is folded up in the direction of the insertion direction of the connecting conductor. For the current path from a clamped connection conductor to the connection part is at a terminal connection according to the EP 1 575 130 only a narrow bridge on the contact frame available. The contact resistance from the clamped connecting conductor to the further electrical outgoing conductor into the switching device is correspondingly high. For each terminal to be clamped, a separate connection window is available, separated by a crossbar. This will make the terminal connection according to the EP 1 575 130 relatively wide, so that it does not fit into switching devices with only half a standard module width.

To DIN 43 880 a division unit a is defined for the installation width of service switching devices. According to this standard, the paving width is a whole number or half integer multiple of 17.5 mm, more precisely: a = n × (17.5 mm + 0.5 mm), n = 0.5; 1.5; 1.5; 2,0, ....

One Installation switching device with a half standard module width So has a paving width of 9 mm.

To insert a connecting conductor, the clamping leg is usually bent by means of an actuating means in such a way that a window for the insertion of connecting conductors is formed between the clamping edge of the clamping leg and the clamping edge of the busbars. If connecting conductors with a large conductor cross-section are to be introduced, it is necessary for the window to become sufficiently large. In the terminal connection according to the EP 1 575 130 the contact point of the spring actuating means must come to lie relatively close to the elbow of the clamping spring. Otherwise, the spring actuator would be the lead in the way. However, this has the consequence that an unfavorable lever for the operator arises. Accordingly, the actuation force that the user must expend when pressing on the pressure surface of the terminal cover to open the terminal, is relatively large.

It Therefore, the object of the present invention, a generic Terminal connection for the screwless connection of one or more connecting conductors to provide a low contact resistance and in service switching devices with only one half standard module width can be installed, the operating force is reduced.

The Task is in a generic terminal connection solved by the characterizing features of the claim 1.

According to the invention the terminal connection a busbar with a connection end and a subsequent derivation area. The busbar has at the connection end a window-like recess with a supporting edge and one of the support edge opposite clamping edge at the transition of the terminal end in the discharge area. The clamping spring also has a support leg, with which it supported on the supporting edge of the busbar is. At the support leg includes a curved piece and a clamping leg, so that the conductor end between the clamping leg and the clamping edge can be clamped as an abutment is. The conductor end is from the side of the elbow insertable into the window-like recess. At the bow piece connects a first partial clamping leg, which at a Bending edge bent in one of the first part clamping leg so that the first and the second part clamp legs a blunt Occupy angles with each other, whose opening in the insertion direction the connection conductor points.

Thereby, the clamping edge is at the junction of the connection end located in the discharge area, stands for the current flow from the terminal lead clamped to the terminal edge to the lead-out area the entire width of the busbar is available, so that a low contact resistance can be achieved.

Furthermore, the connection end has only one window-like recess into which, if necessary, the two connection leads to be connected are clamped. As a result, the terminal connection can be made so narrow that it can be installed in a service switching device only half a standard module width.

In Another embodiment may be used to facilitate the Clamping two connecting conductors of the clamping legs of the clamping spring be longitudinally slotted so that two are close together, independently mutually jamable part-springs arise. Thereby, that the two part springs are close together, so without one separating slot or a roughly centered leadership style not between them, will be another contribution to a narrow design of the terminal connection made to that of the invention Terminal connection in one service switching device only one half standard module width can be installed.

Of the obtuse angles between the first and the second partial clamping legs offers the advantage that the point of attack a backrest of the spring actuator which can be placed in the vicinity of the bending edges. Thereby can the contact point of the spring actuator a greater distance to the pivot point of the clamping leg have on the elbow without the achievable thereby maximum terminal opening becomes smaller, and without that Spring actuator a connection conductor with large Cross section would be in the way. A bigger one Distance between the attachment point and the fulcrum but means a better leverage and thus a lower operating force for the user.

A preferred embodiment is characterized that the busbar has approximately a U-shape, wherein the terminal end forms a U-leg, and the diverting through the crosspiece and the other U-legs is formed.

The Clamping spring runs outside of the U-shaped Busbar so that they are installed in the terminal compartment a switching device there for an operating tool or a tensioning element is accessible

there can according to an advantageous embodiment at the free end of the other U-leg a Aufkantung for fixing further current conductors leading into the interior of the service switching device, be provided.

According to one another embodiment may be at the free end of the other U-legs also be formed a discharge. The discharge rail can thereby run approximately perpendicular to the other U-legs and the the clamping edge opposite side of the connection end can be supported on the discharge rail.

One inventive installation switching device has a housing, with a front and rear front, a mounting side, front and rear narrow sides and Broadside, and a screwless invention Terminal connection, which in a terminal connection space of the housing is fixed in position, wherein the terminal connection space through the housing broadside laterally limited and open at least to the front front side is, wherein the opening of the terminal connection space through a terminal cover member pivotally connected to the housing can be covered, which has a connection surface with one of Number of connection leads to be connected accordingly Number of connection openings, and wherein the Cover member spring actuating means formed and formed are that when pivoting the cover against the clamping spring apply these opening near the bending edge.

The Spring actuators are thus directly with the swivel Connected to the housing connected terminal cover, so that the device structure is simplified. By their orientation in the way that they are the clamping spring when pivoting the cover Pressing open near the bend edges will be on opening pressing the terminal cover requires less effort, while staying the same large opening area in the clamping window.

In a particularly advantageous embodiment of an inventive Installation switching device is with the free, the front side assigning end of a first partial body of the terminal cover pivotally coupled a closure part, which the terminal connection space on the front in cooperation with a housing fixed Covered front end, wherein upon actuation of the terminal cover the closure part with the housing-fixed front end at least partially overlapped. This is a dense Cover of the terminal connection compartment on the front side at the same time minimal space requirement, because the closure part can be parallel to the housing side during pivoting Push the end of the front behind this and takes inside the Switchgear there is no room left.

According to a further, very advantageous embodiment, the closure part, at least in the region of the coupling with the first part body, consists of a material which has different mechanical properties than the first part body of the terminal cover part. In particular, the Ver conclusion part of a soft, flexible material, whereas the first part body of the terminal cover can be made of a hard material. Then, the closure part can be very favorable to the housing-side end of the rear front, and the opening force can be transmitted via the terminal cover on the clamping spring, without any risk of deflection of the terminal cover. The two materials with different mechanical properties can be joined together, for example, in a two-component injection molding process.

Further advantageous embodiments and improvements of the invention and Further advantages can be found in the dependent claims.

Based of the drawings, in which 2 embodiments of the invention are shown, the invention and further advantageous Embodiments and improvements of the invention explained in more detail and described.

It demonstrate:

1 : A schematic partial sectional view of a service switching device according to the invention with a terminal cover, to which a closure member is coupled via a film hinge, with the clamp closed, as well

2 : A schematic partial view of the service switching device according to 1 , with open terminal in the operating position.

In the figures are the same or equivalent components or elements each provided with the same reference numerals, even if they are in various variants in slightly modified Shape are designed.

The 1 shows a partial sectional view of the terminal connection space 18 an installation switching device according to the invention 1 ,

The service switching device 1 has one of two housing parts 2 formed Isolierstoffgehäuse with a front front 304 , a rear front 305 , a mounting side 6 , a front narrow side 7 , a rear narrow side 8th , as well as two broadsides 9 , of which in the view 1 only one, lying in the drawing plane, is shown.

The terminal connection compartment 18 is laterally, ie towards the broadside, through the housing sides 9 of the insulating material housing 3 limited.

To the front front 304 through is through a recess in the rear front 305 of the housing part 2 an opening 20 of the terminal connection space 18 formed through which in the terminal connection space 18 position-fixed terminal connection 10 for the connection of connection conductors 14 is accessible. At the front narrow side 7 first closes a housing-side section 356 the rear front 305 at. This results in the rear front 305 an opening 20 in the area between the front narrow sides 7 opposite end of the housing-side section 356 and the rear narrow side 8th ,

Due to a further recess on the rear narrow side 8th of the housing part 2 the opening extends 20 of the terminal connection space 18 over the shock edges between the rear narrow side 8th and the back front 305 even in the back narrow side 8th into it. This has the advantage that an increased flexibility for the connection direction of the connection conductor 14 given is.

The terminal connection described below 10 is a so-called plug terminal connection. It includes a busbar 102 and a clamping spring 312 , The terminal connection 10 is in the inside of the broadside 9 by means of webs 104 and cones 106 . 108 in a manner known per se in the terminal connection space 18 fixed in position. The one in the terminal compartment 18 position-fixed terminal connection 10 is located in the region of the abutting edge between the rear narrow side 8th and the rear attachment side 6 ,

The busbar 102 of the terminal connection 10 includes a connection end 112 and a subsequent derivation area 114 , At the connection end 112 she has a window-like recess 116 with a supporting edge 118 and one of the support edge 118 opposite clamping edge 120 on. The clamping edge 120 is located at the junction of the terminal end 112 in the discharge area 114 ,

The clamping spring 12 has a support leg 212 on, with which they are at the supporting edge 118 the busbar 102 is supported. The support can be made so that the support leg 212 has at its free end an upstand, with which he the support edge 118 partially for the purpose of supporting.

On the support leg 212 closes a bow piece 214 and a clamping leg 216 at. The conductor end of a lead (not shown here) is from the side of the elbow 214 forth in the window-like recess 116 inserted and is between the clamping leg 216 and acting as an abutment clamping edge 120 firmly clamped. The free end of the clamping leg 216 engages the window-like recess 116 ,

At the bow piece 214 initially closes a first part clamping leg 217 on, at a bending edge 219 in one of the first part clamping legs 217 bent second part clamping legs 218 goes over so that the first and the second part clamping legs 217 . 218 take an obtuse angle with each other. The opening of the obtuse angle points in the insertion direction of the connection conductor, the bending edge 219 is located approximately in the middle of the clamping leg 216 ,

The busbar 102 has approximately a U-shaped basic shape, wherein the terminal end 112 forms the first U-leg, and the discharge area 114 through a crossbar 220 and the second U-leg 222 is formed. At the free end of the second U-leg 222 is an upstand 224 appropriate. At this upstand 224 Further connection conductors can be attached with which the terminal connection 10 is connected to other modules within the switchgear housing, such as the trigger assemblies. In particular, the connection conductors of this upstand can be welded or brazed, also screwing is possible.

In the embodiment of a terminal terminal used in the 1 is shown, the upstand at the free end of the second U-leg 222 to a discharge rail 226 extended. The discharge rail 226 is thus form-fitting with the second U-leg 222 connected; it points approximately perpendicularly from this in the direction of the window-like recess 116 out and over this.

At the free end of the discharge rail 226 Once again there is an upstand at which other connection conductors can then be welded or rented again.

The However, upstand can also be used directly as a terminal connection within find the switching device use.

Overall, the busbar receives 102 According to this embodiment, an outer contour similar to the small letter "b" 112 the busbar 102 it supports itself against the discharge rail 226 , This increases the mechanical stability of the terminal connection 10 ,

It also results in the advantage that when inserting and loosening the connection conductor to the terminal connection 10 acting forces are absorbed by this as a closed system, and thus forces on other elements of the service switching device, such as the housing can be reduced.

The busbar 102 For example, as a stamped and bent part in very large numbers can be produced inexpensively and easily and in a wide variety of shapes.

The opening 20 of the terminal connection space 18 is pivotally connected to the housing part 2 connected terminal cover 22 covered.

The terminal cover part 22 includes one towards the rear narrow side 8th elongated, over a pivot pin 232 with the housing part 2 pivotally coupled, first part body 322 and one at the free end of a film hinge 352 pivotally coupled closure part 354 which is approximately parallel to the rear front 305 runs.

The first part body 322 includes a first cover plate 323 that the terminal connection space 18 in the lower, on the mounting side 6 adjacent part of the narrow side 8th covering, and a roughly tubular counterpart to the pivot pin 232 carries, with which it is pivotally coupled to the pivot pin. The first cover plate 323 has an externally accessible, manually operable pressure surface 330 on.

Near the free end of the printing surface 330 is the first cover plate 323 via an intermediate piece pointing into the interior of the housing 325 with a distance surface 338 connected, which is also parallel to the rear narrow side 8th towards the front 305 to extend and the terminal connection space 18 in the upper, on the back front 305 adjacent part of the narrow side 8th covers.

At the free end of the distance surface 338 is the already mentioned film hinge 352 with the pivotally coupled thereto closure part 354 ,

This is a plate which at its free end at least partially with the housing-side part 356 the rear front 305 overlaps. The closure part 354 and the housing-side part 356 the rear front thus together form the rear front 305 ,

At its free end carries the closure part 354 laterally, towards the broadsides 9 pointing, projecting pins 358 , In the housing is near the housing side part 356 the rear front 305 a backdrop-like leadership 360 attached, in such a way that the pins 358 in the lead 360 are included.

Now if the terminal cover 22 by pressure on the printing surface 330 is pivoted in the direction of the device interior, so is the closure part 354 behind the housing side part 356 the rear front 305 glide and through the backdrop-like leadership 360 parallel to this slidably guided. The angle between the closure part 354 and the distance surface 338 it changes.

So form the closure part 354 and the distance surface 338 in the closed position according to the 1 an acute angle with each other, which is open into the housing interior. In the position according to 2 if the terminal cover 22 pivoted into the housing interior, form the closure part 354 and the distance surface 338 an obtuse angle with opening into the interior of the housing.

Upon actuation of the terminal cover part and concomitant pivoting about the pivot pin 232 lead the closure part 354 and the distance surface 338 also a pivoting movement against each other around the film hinge 352 out.

By attaching the film hinge between the closure part 354 and the distance surface 338 So can the closure part 354 Space-saving approximately parallel behind the housing-side part 356 the rear front 305 slide. In a rigid coupling, as was previously known in the prior art alone, the closure part would 354 pivot into the housing interior and block space for its trajectory, which would then no longer be available for functional assemblies or components of the switching device.

The intermediate piece 325 has an outward facing pad 324 on. In the connection area 24 is at least one connection opening 26 existing. Starting from the connection opening 26 becomes the intermediate piece 325 from a tubular recess 28 penetrated, which is approximately perpendicular to the pad 324 starting the intermediate piece 325 penetrates and thus as a guide means for one at the terminal connection 10 serves to be connected connecting conductor.

The connection conductor is through the connection opening 26 in the terminal cover part 22 guided and meets after leaving the tubular recess 28 on the clamping leg 216 the clamping spring 312 ,

If the terminal conductor is a rigid conductor, then by means of the connecting conductor alone, the clamping leg 216 the clamping spring 312 far from the clamping edge 120 be pushed away, that the connection conductor between the free end of the clamping leg 216 and the clamping edge 120 in the window-like recess 116 insertable and can be clamped.

For a flexible connection conductor, the window-like recess must 116 initially opened in a different way.

This is done by pivoting the terminal cover 22 ,

Near the tubular recess 28 carries the terminal cover part 22 at the intermediate piece 325 one on the clamping leg 216 directed nose 30 , which serves as a spring actuator.

At the nose 30 Of course, it can also be other protruding components or components, in particular, could the function of the nose 30 also from a collar-like the outlet opening of the tubular recess 28 be formed around circumferential web.

Due to the restoring spring force of the clamping leg 216 This presses the nose 30 and thus the terminal cover part 20 outward.

By pressure on the printing surface 330 or on the distance surface 338 becomes the terminal cover part 22 swung inward, and over the nose 30 becomes the clamping leg 216 far from the clamping edge 120 pushed away that window-like recess 116 for the insertion of the connection conductor, see 2 ,

The nose 30 forms a spring actuator. It is so on the terminal cover 22 formed and trained so that they act on the clamping spring opening this near the bending edge during pivoting of the cover.

By their orientation in the way that they when pivoting the cover acted upon opening the clamping spring near the bending edges, becomes less when the terminal cover is opened Required effort, with a consistently large opening area in the clamping window.

In a concrete example, the first and second partial clamping legs form 217 . 218 an angle of about 160 °. Compared to an otherwise unchanged clamping spring with straight, unbent clamping legs 216 halves the insertion force by inserting the angle at maximum terminal opening.

Accordingly, the procedure for releasing a clamped connection conductor. Pressure on the terminal cover 22 triggers the deadlock in the manner described above the clamping leg 216 and the connecting conductor, so that this out of the window-like recess 116 can be pulled out. Due to the above-described kinked design of the clamping leg 216 is also the actuating force to release the connecting conductor much lower.

Alternatively, the opening movement of the terminal cover 22 also by a standard longitudinal slot, or Phillips screwdriver 364 be effected. For this purpose, this is at an acute angle in a suitable receptacle for receiving 350 (slot, cross or spherical recess) on the distance surface 338 put on and the clamp by a pressure movement with the screwdriver 364 open.

Even if in the representation according to the 1 and 2 only one connection opening 26 and only a tubular recess 28 Of course, two or more such connection openings and recesses for receiving and connecting a plurality of connection conductors in the intermediate piece can of course also be used 325 be provided. All connected connection conductors can be connected with a common clamping spring via their clamping legs 216 be clamped. When operating the terminal cover 22 Then all connected conductors are released at the same time and can be released at the same time.

The terminal cover part 22 with the first part body 322 , the hinge 352 and the closure part 354 can also consist of two material components with different mechanical properties.

These can in a two-component injection molding process be connected to each other.

The result is then a hard / soft connection. The hard component is the main ingredient. From it is the first part of the body 322 produced. It serves to activate the actuating forces on the clamping spring 312 to transfer and thereby prevent bending of the component or at least minimize.

In the area of the hinge 352 and the closure part 354 the soft component is used.

This allows easy movement of the hinge, which is required so that the above-described angle change of the angle between the closure part 354 and the first part body 322 when operating the terminal cover 22 can adjust easily.

A flexibility of the closure part 354 continues to contribute to this, if it is in the backdrop-like leadership 360 towards the front narrow side 7 out parallel to the rear front 305 is moved, could also bend something in itself, and thus even lighter and closer to the front narrow side 305 can be present.

Overall, this leads to a very tight guidance of the closure part 354 at the back front 305 and thus to a large space savings when pivoting the terminal cover 322 ,

1

Service switching device

2

housing part

6

mounting side

7

Front narrow side

8th

Rear narrow side

9

broadside

10

screwless terminal connection

18

Terminal chamber

20

Terminal chamber opening

22

cover, terminal cover

26

port opening

28

Guide means tubular recess

30

Spring actuator

102

conductor rail

104

web

106

spigot

108

spigot

112

terminal end

114

discharge area

116

window-like recess

118

supporting edge

120

clamping edge

212

support legs

214

elbow

216

clamping leg

217

first Part-clamping leg

218

second Part-clamping leg

219

bending edge

220

crosspiece

222

second U-leg

224

backsplash

226

discharge bar

232

pivot pin

304

Front front

305

Rear front

312

clamping spring

322

first partial body

323

First cover

324

terminal area

325

connecting piece

330

print area

338

Distance area

350

engagement opening

352

film hinge

354

closing part

356

Mutual housing Part of the back front

358

spigot

360

Similar backdrop guide

364

screwdriver

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• EP 1575130 [0002, 0002, 0002, 0005]

Cited non-patent literature

• - DIN 43 880 [0003]

Claims (12)

Clamp connection ( 10 ) for connecting a conductor ( 14 ) to an installation switching device ( 1 ), with a compression spring on the conductor end ( 16 ) acting clamping spring ( 12 ) for clamping the conductor end ( 16 ) on an abutment, characterized in that - the clamping connection ( 10 ) a busbar ( 102 ) with a connection end ( 112 ) and a subsequent derivation area ( 114 ), - that the busbar ( 102 ) at the connection end ( 112 ) a window-like recess ( 116 ) with a supporting edge ( 118 ) and one of the supporting edge ( 118 ) opposite clamping edge ( 120 ) at the junction of the terminal end ( 112 ) into the derivation area ( 114 ), - that the clamping spring ( 12 ) a supporting leg ( 212 ), with which they at the support edge ( 118 ) of the busbar ( 102 ) is supported, - that on the supporting leg ( 212 ) a bow piece ( 214 ) and a clamping leg ( 216 ), so that the conductor end ( 16 ) between the clamping leg ( 216 ) and the clamping edge ( 120 ) can be clamped as an abutment, - that connects to the elbow a first part-clamping leg, which merges at a bending edge in a bent from the first part-clamping leg second part-clamping legs, so that the first and the second part-clamping legs an obtuse angle occupy each other, the opening points in the insertion direction of the connecting conductor. Clamp connection ( 10 ) according to claim 1, characterized in that the conductor end ( 16 ) from the side of the elbow ( 214 ) ago in the window-like recess ( 116 ) is insertable. Clamp connection ( 10 ) according to claim 2, characterized in that the busbar ( 102 ) has approximately a U-shape, wherein the terminal end ( 112 ) forms a U-leg, and the derivative region ( 114 ) through the crosspiece ( 220 ) and the other U-legs is formed. Terminal connection ( 10 ) according to claim 3, characterized in that the clamping spring ( 12 ) runs outside the U-shaped busbar, so that when installed in the terminal connection space ( 18 ) of a switching device there for an operating tool or a clamping element is accessible Clamp connection ( 10 ) according to claim 4, characterized in that at the free end of the other U-leg an upstand ( 224 ) is provided for securing further current conductors. Clamp connection ( 10 ) according to claim 4, characterized in that at the free end of the other U-leg a discharge rail ( 226 ) is formed. Terminal connection ( 10 ) according to claim 6, characterized in that the discharge rail ( 226 ) runs approximately perpendicular to the other U-leg and the clamping edge ( 120 ) opposite side of the terminal end ( 112 ) on the discharge rail ( 226 ) is supported. Terminal connection ( 10 ) according to one of the preceding claims, characterized in that the clamping leg ( 216 ) of the clamping spring ( 12 ) is longitudinally slotted, so that two closely spaced, independently clampable part-springs ( 13a . 13b ) arise. Installation switching device with a housing, with a front and rear front, a fastening side, front and back narrow sides and broadsides, and with one screwless terminal connection according to one of Claims 1 to 8, which in a terminal connection space of Housing is fixed in position, wherein the terminal connection space bounded laterally by the housing broadside and at least is open to the front, with the opening of the terminal connection space by a pivotable with the housing connected terminal cover part is covered, which has a connection surface corresponding to one of the number of connecting leads to be connected Number of connection openings, and wherein the Cover member spring actuating means formed and formed are that when pivoting the cover against the clamping spring apply these opening near the bending edge. Installation switching device according to claim 9, wherein with the free, the front facing end of a pivotable first part body of the terminal cover a closure part is coupled, which the terminal connection space on the front in conjunction with a housing-fixed front end covered, wherein upon actuation of the terminal cover the the Closure part with the housing-fixed front end at least partially overlapped. Installation switching device according to claim 10, wherein the closure part at least in the region of the coupling with the first part body consists of a material that has other mechanical properties than the first part body of the terminal cover. Installation switching device according to one of Claims 9 to 11, wherein the housing is a half standard module width having.