EP3118933A1 - Connecting device with plug-in terminal - Google Patents

Abstract

The invention relates to a connecting device (100) which has at least one service switching device (1) with at least one screwless terminal and at least one connecting element (8), wherein the connecting element (8) has at least one connecting conductor (10) with at least one contact lug (11 ), characterized in that the clamp is of the type having at least one clamping spring (40) acting as a compression spring on a clamping point (29) of the contact lug (11) for clamping the contact lug (11) and for pressing a contact point (30). the contact lug (11) on a busbar (27), and that the contact lug (11) at least in the region in which the clamping spring (40) presses on the clamping point (29), a greater surface hardness than at least at the contact point ( 30), so that a cutting of the clamping spring (40) in the contact lug (11) in the region of the clamping point (29) is prevented.

Description

The invention is based on a connecting device which has at least one service switching device with a housing and at least one screwless terminal and at least one connecting element, wherein the connecting element has at least one connecting conductor with at least one contact lug arranged thereon, according to the preamble of claim 1.

Such a generic connection device is known in connection with circuit breakers, residual current circuit breakers, motor protection switches, relays or contactors, in particular for use in distribution boards or switchgear in industrial use, so for example in the power supply or control of motors or in low-voltage switchgear. An example of a connection element that can be used in a generic connection device is a busbar. A bus bar is a device for simultaneously electrically connecting a plurality of juxtaposed terminals of one or more stacked service switching devices. The pole rail of the busbar and of the pole rail usually approximately comb-like protruding tabs are made of a rigid and electrically highly conductive material, a rigid guide plate, for example, preferably made of copper or a highly conductive copper alloy. For the purpose of electrical contact safety, the pole rail is accommodated in an insulating profile from which the contact lugs protrude through openings at the points provided for this purpose.

Another example of a connection element that can be used in a generic connection device is a connector. Connectors serve to establish an electrical connection between the terminals, for example, a motor protection switch and a contactor. A connector for connecting two three-phase devices has, for example, three connection conductors, which can be arranged together in a Isolierstoffgehäuse, projecting from each connection conductor two tabs, one for insertion into the terminal of the motor protection switch and one for insertion into the terminal of the contactor.

Another example of a connecting element that can be used in a generic connection device for the electrical connection of a three-pole contactor is a so-called turning connector. This is in principle a three-pole connector in which the connection conductors between the individual poles of the two devices to be connected are arranged so that the direction of rotation of a connected motor reverses.

Traditionally, screw terminals have been used in industrial switchgear installations. The connection of a connecting element takes place in two steps. First, the connecting element is placed on the open screw terminals, while the contact lugs are inserted into the open screw terminals. Then the clamping screws are tightened one by one.

Recently, it has been proposed to use screwless terminals in service switching devices used in an industrial environment. In this case, instead of a clamping screw known as a cage spring clamp assembly is used. An example of this is in the EP 0 928 043 B1 shown. The spring clamp has a clamping frame and an approximately Ω-shaped clamping spring, which has a support wing, a clamping wing with slot for clamping the connecting conductor and a loop which forms a spring and connects the support with the clamping wing. To clamp the connection conductor, you have to press with a tool on the loop and thus move the clamping wing, so that the slot is released to insert the connection conductor. When the tool is removed, the restoring spring force of the loop retracts the clamping wing and the lead is clamped in the slot. Compared to the screw terminal offers a certain amount of work, and the clamping force is adjusted reproducibly by the spring force of the spring loop and no longer dependent on with which torque the mechanic puts on the clamping screw. To remove the connecting conductor, the tool is again required to press the clamping wing back into its open position.

When connecting a connecting element with tabs to one or more juxtaposed installation switchgear with such screwless spring terminals, however, there is the difficulty that a plurality of spring terminals, namely as many as tabs are inserted, would have to be opened at the same time. This can be almost impossible for the fitter, since a person can operate a plurality of tools with one hand hardly meaningful, and also applied by the fitter force to open a number of juxtaposed terminals is a multiple of the clamping force of a single spring clamp, which easily reach a no longer manageable dimension of the applied opening force.

It is therefore an object of the present invention to improve a generic connection device so that a tool-free connection or again removing a connecting element with or from a plurality of juxtaposed screwless terminal connections juxtaposed installation switching devices is made possible.

This object is achieved by a connecting device with the features of claim 1.

Thus, according to the invention, the clamp is of the type which has at least one clamping spring acting as a compression spring on a clamping point of the contact lug for clamping the contact lug and for pressing a contact point of the contact lug against a bus bar, and the contact lug is in the region in which the clamping spring rests the nip presses, a greater surface hardness than at least at the contact point, so that a cutting of the clamping spring is prevented in the contact lug in the region of the nip.

The object is achieved according to the invention thus by two measures. The first relates to the use of another type of screwless spring clip, namely of the type having at least one clamping spring acting as a compression spring on a clamping point of the contact lug for clamping a connecting conductor. This type is also known as a spring-loaded clamp, also known in English as a "push-in" clamp. At the spring pressure clamp can be rigid connection conductor, such as a contact lug, are inserted without opening tool. The spring pressure clamp has a support wing, a clamping wing for clamping the connection conductor or the contact lug at the free end of the clamping wing and a loop which forms a spring and connects the support with the clamping wing. When inserting pushes the rigid connection conductor or the contact lug the tail of the clamping wing aside, the restoring spring force of the loop provides the necessary contact pressure. By using this type of screwless spring clip, a connector, such as a bus bar with its plurality of adjacent rigid tabs, or even a male or female connector, can be easily inserted and clamped into a plurality of adjacent clamping apertures without the need for a tool.

When pressed, the clamping end of the clamping wing could be pressed into the material of the contact lug, in particular if it consists of a highly conductive copper alloy. The clamping end of the clamping wing could then hook a little in the contact lug. This can cause a pulling out of the busbar without additional tools is no longer easy and only with considerable effort against the Verhakungswiderstand is possible, with repeated pulling the clamping spring or the contact lug could be damaged. To pull out the busbar, it might then be necessary to push each spring back from the contact lug only a little way away, by means of a tool. The second inventive measure is therefore that the contact lug in the region in which the clamping spring presses on the clamping point, a greater surface hardness than in the rest of the contact lug, in particular as at the contact point at which the contact lug is pressed against the busbar. If, for example, the contact lug consists of a good electrically conductive but mechanically rather soft copper alloy, according to the invention the surface is hardened in the region in which the clamping spring presses on the clamping point. The advantageous effect is that in this hardened surface area, the clamping end of the clamping spring can not be pressed into the material, thus the terminal end of the clamping wing no longer hooked, and consequently the busbar can also be pulled out without tools again. According to the invention, it is sufficient for this advantageous effect, the surface of a locally limited Place to harden. In the hardened region, the electrical conductivity may be reduced, depending on how hardened. But that is not disadvantageous, since at the contact point where the contact lug is pressed against the busbar, yes not hardened and thus, where it depends on a low electrical contact resistance, the good electrical conductivity of the material of the contact lug is maintained. Only at the point where it depends on a good mechanical hardness, but not on a good electrical conductivity, the surface of the contact lug is cured.

The hardening on the surface can, for example, take place in such a way that a plate of another, hard material is placed on the surface of the contact lug or embedded in the surface in the relevant area. The other, hard material may be a less electrically conductive material, such as stainless steel, it could even be a non-conductor in the extreme case. The remaining volume of the contact lug and in particular the surface on the side facing the busbar consists of a material with good electrical conductivity, for example copper or brass.

According to an advantageous embodiment of the invention, the contact lug is a metal strip of two layers of different hardness and different conductive metals, which are materially or positively connected with a first layer with the greater hardness facing the clamping end of the clamping spring, and the second layer with the facing greater electrical conductivity of the busbar. The first layer may consist of stainless steel and the second layer of copper or brass. In construction, such a contact lug according to this embodiment is similar to a bimetallic strip formed, but as possible materials with similar coefficients of thermal expansion are used to avoid a temperature-induced bending of the contact lug.

It could come in case of prolonged operation of a connecting device according to the invention under unfavorable circumstances to stick or otherwise adhere the clamping leg to the contact lug, whereby extraction of the connecting element is difficult. In order to be able to easily remove the connecting element even in such an unfavorable operation without additional tools, in an advantageous development of the invention proposed to form the connecting element with a manually operable opening member which presses the clamping spring away from the nip on actuation and thus allows removal of the contact lug from the clamp without the use of an additional tool. If the connecting element has an insulating profile in which the one or more connecting conductors is embedded with the or the contact lugs or, so in an advantageous embodiment, the insulating profile is formed with the manually operable opening member.

When operating a connection device according to the invention in an industrial environment, under unfavorable circumstances, for example due to strong vibrations, the contact pressure at the terminal point may be loosened or the contact lug may be "shaken out" of the connection terminal. To prevent this, it is proposed according to an advantageous embodiment of the invention to form the connecting element with a locking member which cooperates with a detent element adapted thereto latching on the housing of the service switching device, when the clamping spring clamps the contact lug at the nip and at the contact point to the Power rail presses. The locking member prevents loose shaking of the connecting element. If the connecting element has an insulating profile in which the one or more connecting conductors is embedded with the or the contact lugs or, so in an advantageous embodiment, the insulating profile is formed with the manually operable opening member. For example, this can be realized in a busbar with insulating profile. The locking member prevents here also a loose shaking the busbar total. The locking member is formed to a releasable locking connection with the locking means on the housing, so that the connecting element, for example, the busbar with the insulating profile can also be removed again. An advantageous example of a locking member according to the invention is a locking lug on a resiliently clamped locking bar on one side, and the corresponding locking means on the housing can be in an advantageous example, a molded on the housing corresponding locking lug or a detent opening.

figure description

Figures and description serve to better understand the subject. Articles or parts of objects which are substantially the same or similar may be given the same reference numerals. The figures are merely a schematic representation of four possible embodiments of the invention.

Figur 1

schematisch und exemplarisch einen Querschnitt durch eine erfindungsgemäße Verbindungsanordnung gemäß einer ersten Ausführungsform, mit einer Sammelschiene, vor dem Einstecken der Sammelschiene,

Figur 2

schematisch und exemplarisch einen Querschnitt durch die Verbindungsanordnung nach Figur 1, mit eingesteckter Sammelschiene,

Figur 3

schematisch und exemplarisch einen Querschnitt durch eine erfindungsgemäße Verbindungsanordnung gemäß einer zweiten Ausführungsform, vor dem Einstecken der Sammelschiene,

Figur 4

schematisch und exemplarisch einen Querschnitt durch die Verbindungsanordnung nach Figur 3, mit eingesteckter Sammelschiene,

Figur 5

schematisch und exemplarisch einen Querschnitt durch die Verbindungsanordnung nach Figur 3, vor dem Herausziehen der Sammelschiene,

Figur 6

schematisch und exemplarisch einen Querschnitt durch eine erfindungsgemäße Verbindungsanordnung gemäß einer dritten Ausführungsform, vor dem Einstecken der Sammelschiene,

Figur 7

schematisch und exemplarisch einen Querschnitt durch die Verbindungsanordnung nach Figur 6, mit eingesteckter Sammelschiene,

Figur 8

schematisch und exemplarisch einen Querschnitt durch eine erfindungsgemäße Verbindungsanordnung gemäß einer vierten Ausführungsform, vor dem Einstecken der Sammelschiene,

Figur 9

schematisch und exemplarisch einen Querschnitt durch die Verbindungsanordnung nach Figur 8, mit eingesteckter Sammelschiene,

Figur 10

schematisch und exemplarisch einen Querschnitt durch die Verbindungsanordnung nach Figur 8, vor dem Herausziehen der Sammelschiene,

Figur 11

eine erfindungsgemäße Verbindungsanordnung mit zwei aneinandergereihten Motorschutzschaltern und einer Sammelschiene,

Figur 12

eine Detailansicht von schräg oben auf eine erfindungsgemäße Verbindungsanordnung nach Figur 11, kurz bevor die Kontaktfahnen der Sammelschiene in die Steckfederklemme eingesteckt werden.

Figur 13

schematisch und exemplarisch einen Querschnitt durch eine erfindungsgemäße Verbindungsanordnung gemäß einer fünften Ausführungsform, vor dem Einstecken der Sammelschiene,

Figur 14

schematisch und exemplarisch einen Querschnitt durch die Verbindungsanordnung nach Figur 13, mit eingesteckter Sammelschiene,

Showing:

FIG. 1

schematically and exemplarily a cross section through a connection arrangement according to the invention according to a first embodiment, with a busbar, before plugging in the busbar,

FIG. 2

schematically and exemplarily a cross section through the connection arrangement according to FIG. 1 , with inserted busbar,

FIG. 3

schematically and by way of example a cross section through a connection arrangement according to the invention according to a second embodiment, prior to insertion of the busbar,

FIG. 4

schematically and exemplarily a cross section through the connection arrangement according to FIG. 3 , with inserted busbar,

FIG. 5

schematically and exemplarily a cross section through the connection arrangement according to FIG. 3 , before pulling out the busbar,

FIG. 6

schematically and exemplarily a cross section through a connection arrangement according to the invention according to a third embodiment, before insertion of the busbar,

FIG. 7

schematically and exemplarily a cross section through the connection arrangement according to FIG. 6 , with inserted busbar,

FIG. 8

schematically and exemplarily a cross section through a connection arrangement according to the invention according to a fourth embodiment, before insertion of the busbar,

FIG. 9

schematically and exemplarily a cross section through the connection arrangement according to FIG. 8 , with inserted busbar,

FIG. 10

schematically and exemplarily a cross section through the connection arrangement according to FIG. 8 , before pulling out the busbar,

FIG. 11

a connection arrangement according to the invention with two juxtaposed Motor protection switches and a busbar,

FIG. 12

a detail view obliquely from above on a connection arrangement according to the invention FIG. 11 , just before the contact lugs of the busbar are inserted into the spring-loaded terminal.

FIG. 13

schematically and exemplarily a cross section through a connection arrangement according to the invention according to a fifth embodiment, before insertion of the busbar,

FIG. 14

schematically and exemplarily a cross section through the connection arrangement according to FIG. 13 , with inserted busbar,

In the figures, identical, similar and identical or similar elements are designated by the same reference numerals.

The example of the busbar with insulating profile is chosen and described here by way of example only and by way of example, the choice of this example is by no means meant to be limiting. The idea of the invention described using the example of the busbar can be easily transferred to other connecting elements, in particular to plug connectors and reversing connectors, without the need for further figurative explanations.

It will be the first FIG. 11 and 12 considered. The FIG. 11 shows a connecting device 100 according to the invention. In the example, this has two three-phase motor protection switches 1, 1 'arranged next to one another at their broad sides. Each of the two motor protection switches 1, 1 'has three access terminals 3, 4, 5, 3', 4 ', 5' and in each case opposite three outgoing terminals, in the figure only two can be seen, with the reference numerals 6, 7. At the access side If a busbar 8 to be infected. The busbar 8 has an insulating profile 9, in which a pole rail 10 (see FIG. 12 ) is arranged on the comb-like six contact lugs 11, 12, 13, 14, 15, 16 are formed and projecting perpendicular to the longitudinal direction of the pole rail. Like the arrow P in FIG. 11 indicates, the busbar 8 is attached with the contact lugs 11, 12, 13, 14, 15, 16 ahead perpendicular to the front side 17 of the motor protection switch, the contact lugs then engage in the terminal openings.

FIG. 12 shows in a detail view one of the terminals from diagonally above. The insulating profile is here removed from the busbar, you can see the pole rail 10 and two of the contact lugs 12, 13. The terminal is a spring plug terminal as a clamping spring 40. One sees the upper part of the loop 18 and a part of the clamping wing 19. The contact lug 12 is located shortly before insertion into the terminal opening.

It will be the FIGS. 1 and 2 considered. FIG. 1 shows schematically and exemplarily a cross section through a part of the connecting device 100 as shown in FIG. One recognizes a part of the housing of the motor protection switch 1: the front front side 20, the rear front side 21, the front narrow side 22, the rear narrow side 23. At the rear narrow side 21 an insertion opening 28 is formed for inserting the contact lug 11 of the busbar 8 to the Clamping point in the direction of arrow P.

The nip is formed by a spring plug terminal. This has a clamping spring 40 with a support wing 25, a clamping wing 19 and a loop 18 which connects the clamping wing 19 with the support wing 25 and which forms a spring and causes the restoring spring force on the clamping wing. The clamping wing 19 has a slight kink, its terminal end 24 is slightly upwards, to the front side 21, bent. With the support wing 25, the clamping spring 40 is supported on a support rail 26 in the interior of the service switching device 1. With the clamping end 24, the clamping spring 40 presses an inserted connecting conductor, for example the contact lug 11, against a busbar 27. The electrical contact takes place between the busbar 27 and the contact lug 11, see FIG. 2 , The busbar 27 and the support rail 26 may be parts of a common terminal frame, but they may also be designed as individual parts. The support rail 26 could also be designed as a housing projection. At the busbar 27 further conductor pieces are then connected inside the service switching device 1, which continue the current path from the terminal point inside the service switching device 1.

In the illustration after FIG. 1 the busbar 8 and the motor protection switch 1 are still separated from each other. The busbar 8 can be inserted into the insertion opening 28 in the direction of the arrow P, with the contact lug 11 ahead.

FIG. 2 shows the state in which the busbar 8 is inserted with the contact lug 11 ahead in the insertion opening 28. The clamping end 24 of the clamping wing 19 presses against one side of the contact lug 11. The area in which the clamping end 11 rests against the contact lug 11 is designated as a clamping point 29. Due to the pressure effect of the clamping end 24 of the clamping wing 19 on the contact lug 11 of the nip 29 opposite side of the contact lug 11 is pressed flat against the busbar 27. The region in which the clamping point 29 opposite side of the contact lug 11 bears flat against the busbar 27 is referred to as a contact point 30.

At the contact point 30, the electrical contact between the pole rail 10 and the bus bar 27 takes place. There, the current flows from the pole rail into the service switching device 1 or out of the service switching device 1 in the pole rail out. At the contact point 30 should therefore prevail a low electrical contact resistance. If the pole rail with the contact lugs 11 made of a highly conductive material, such as copper or a copper alloy, which is accessible at a sufficiently large contact pressure from the side of the clamping spring and its terminal end forth on the nip.

At the terminal point 29, there is no current flow, the terminal point 29 has no electrical contact function, only a mechanical function. A spring steel used for the production of the clamping spring 40 is usually not a good electrical conductor, it is specially optimized in terms of its elastic properties.

The contact lug 11 has in the area in which the clamping spring presses with the clamping end 24 on the clamping point 29, a greater surface hardness than at least at the contact point 30. The area with the greater surface hardness is in the figures here in the example as a black colored Area 29 shown. The advantageous effect is that such a cutting of the clamping end 24 of the clamping spring is prevented in the well-conducting, but less hard material of the contact lug 11 in the region of the clamping point 29. There is no hard claws of the clamping end 24 of the clamping wing 19 of the clamping spring 40 instead. The busbar can therefore be easily pulled out of the insertion opening 28 again, without a tool for bending back the clamping wing 19 would be needed. The clamping end 24 will simply slide on the hard surface of the region 29 when pulled out.

The hardening of the surface in region 29, the nip, can in the example be effected by placing a plate of another, hard material on the surface the contact lug 11 is placed in the region 19 or embedded in the surface of the contact lug 11 in the region 19. In this case, the other, hard material may be an electrically poorly conductive material or a non-conductor. Other methods of surface hardening, which are known in principle, can also be used to produce a higher surface hardness, at least in the region 29, of the nip, than in the region of the contact point 30. The hardened region 29 is shown here as a spatially narrowly defined region. This is also sufficient to fulfill the advantageous function of the invention. Of course, the hardened region 29 can also be larger than shown here in the example in the example; it could even extend to the entire one broad side of the contact lug 11. It is important that in the remaining volume of the contact lug 11 and the pole rail 10 and at the contact point 30, the material of the pole rail and the contact lug 11 has a high electrical conductivity.

It will be now FIG. 13 and 14 considered. The embodiment shown here differs from that in the FIGS. 1 and 2 shown by the fact that the contact lug 11 'is a metal strip of two layers 29', 29 "of different hardness and different conductive metals, which are materially or positively connected, wherein a first layer 29 'with the greater hardness of the clamping end 24 of the clamping spring 40th facing, and the second layer 29 "facing the busbar 27 with the greater electrical conductivity. The first layer 29 'may be made of stainless steel and the second layer 29 "of copper or brass." In construction such a contact lug 11' according to this embodiment is similar to a bimetallic strip, but materials with similar coefficients of thermal expansion are preferably used Temperature-induced bending of the contact lug 11 'to avoid.

It will be the FIGS. 6 and 7 considered. The embodiment shown therein differs from that in the FIGS. 1 and 2 shown embodiment in that here the insulating profile 9 is formed with a locking member 31 which cooperates with a matching detent element 32 on the housing of the service switching device, here in the example on the rear narrow side 23, latching when the clamping spring with the terminal end 24, the contact lug 11 clamped at the terminal point 29 and presses at the contact point 30 to the busbar 27. The locking member 31 is a latching nose 33 on a resiliently clamped on one side Locking bar 34. The corresponding locking element 32 on the housing is formed on the housing corresponding latching lug or a detent opening (not shown in the figure). The locking member 31 in engagement with the locking element 32 prevents shaking loose of the insulating 9 and thus also shaking loose the busbar in an industrial environment, and thus supports the clamping action of the clamping end 24 of the clamping spring 40 on the contact lug 11. To remove the busbar 8, the locking member 31 are tool bent away with one or more fingers, so that the locking lug 33 releases the locking element 32, and with the same hand or the other hand then the busbar 8 can be pulled out of the insertion opening 28.

It will be the FIGS. 8-10 considered. The embodiment shown therein differs from that in the FIGS. 1 and 2 shown embodiment in that here the insulating profile 9 is formed with a manually operable opening member 35 which presses the clamping end 24 of the clamping spring away from the nip 29 on actuation and thus removing the contact lug 11 from the terminal allows without the use of an additional tool. This is advantageous since, in the case of a long-lasting operation of a connecting device 100 according to the invention under unfavorable circumstances, gluing or otherwise adhering the clamping wing 19 to the contact lug 11 could occur, thereby making it difficult to pull out the busbar 8. In order to remove the busbar 8 easily even in such an unfavorable operation without additional tools, the insulating profile 9 is formed with a manually operable opening member, as it is merely exemplary in the FIGS. 8-10 is shown.

The opening member 35 is formed in the example in the form of a Doppelarmhebels 35 here. Whose pivot axis 36 is located on a Anformung 37 on the insulating 9, which protrudes from the insulating section 9 a piece. As a result, one of the insulating profile 9 spaced, firmly connected to the insulating fulcrum for the double arm is created, which allows a pivoting to the insulating profile and away from the insulating profile. A first arm 38 of the double-armed lever extends approximately parallel to the contact lug 11 in the direction of the clamping wing 19 of the clamping spring 40. A second arm 39 of the double-armed lever extends into the space outside of the insulating profile 9 and is inserted with busbar externally operable by hand. In the embodiment shown here, by way of example only, the second arm is slightly angled so that it is better accessible with a finger for actuation.

FIG. 8 shows the busbar separate from the service switching device. 1 FIG. 9 shows the busbar 8 plugged onto the insertion opening 28 of the service switching device 1. The free end of the first arm 38 of the opening member 35 terminates in this case just before the clamping wing 19 of the clamping spring 40th

FIG. 10 shows the situation when operating the opening member. Pressure on the second arm 39 in the direction of arrow D pivots the first arm 38 in a clockwise direction, this presses the clamping end 24 of the clamping wing 19 away from the nip, indicated by the arrow E, and the contact lug 11 can be pulled upwards, see Arrow F.

It will be the Figures 3 - 5 considered. In the exemplary embodiment shown there, the features of the two are based on the Figures 6-7 and 8-10 combined embodiments described. The insulating 9 is both with a manually operable opening member 35, as in connection with the FIGS. 8-10 explained, trained, as well as in addition with a locking member 31 which cooperates with a detent element 32 adapted thereto latching to the housing of the service switching device, as in connection with the FIGS. 6 and 7 has already been explained above.

Also in embodiments that in the FIGS. 3 to 11 shown and described, the contact lug may each be formed as a metal strip of two layers of different hard and different conductive metals, which are materially connected or positively connected, wherein a first layer with the greater hardness facing the clamping end of the clamping spring 40, and the second layer facing with the greater electrical conductivity of the busbar, according to the in the Figures 13 and 14 shown way. On a figurative representation this is to be omitted for the sake of simplicity. However, the combination of a formed as a metal strip of two layers of different hard and different conductive metals contact lug with at least one of the embodiments according to at least one of Figures 1-2 and 3 - 11 hereby expressly disclosed. <U> REFERENCE LIST </ u> 1 Motor protection switch 23 rear narrow side 1' Motor protection switch 24 jammed 3 access terminal 25 supporting wing 3 ' access terminal 26 support rail 4 access terminal 27 conductor rail 4 ' access terminal 28 insertion opening 5 access terminal 29 nip 5 ' access terminal 29 ' first shift 6 outgoing terminal 29 " second layer 7 outgoing terminal 30 contact point 8th bus 31 detent member 9 insulating profile 32 locking element 10 pole bus 33 locking lug 11 contact tag 34 Rest bar 11 ' contact tag 35 opening member 12 contact tag 36 swivel axis 13 contact tag 37 conformation 14 contact tag 38 first arm 15 contact tag 39 second arm 16 contact tag 40 clamping spring 17 front 100 connecting device 18 loop P arrow 19 clamping wing D arrow 20 front front e arrow 21 rear front F arrow 22 front narrow side

Claims (11)

Connecting device (100) which has at least one installation switching device (1) with a housing and at least one screwless terminal and at least one connecting element (8), wherein the connecting element (8) has at least one connecting conductor (10) with at least one contact lug (11 ) Has,
characterized in that the clamp is of the type having at least one clamping spring (40) acting as a compression spring on a clamping point (29) of the contact lug (11) for clamping the contact lug (11) and for pressing a contact point (30) of the contact lug (11). 11) on a busbar (27), and that the contact lug (11) at least in the region in which the clamping spring (40) presses on the clamping point (29) has a greater surface hardness than at least at the contact point (30), so that a cutting of the clamping spring (40) in the contact lug (11) in the region of the clamping point (29) is prevented. Connecting device (100) according to claim 1, characterized in that in the region in which the clamping spring (40) presses on the clamping point (29), a plate of another, hard material on the surface of the contact lug (11) placed or in the Surface is embedded. Connecting device (100) according to claim 1, characterized in that the other, hard material is an electrically poorly conductive material or a non-conductor. Connecting device (100) according to claim 1, characterized in that the contact lug (11) is a metal strip of two layers (29 ', 29 ") of different hardness and different conductive metals, which are materially or positively connected to each other, wherein a first layer ( 29 ') with the greater hardness facing the clamping end (24) of the clamping spring (40), and the second layer (29 ") facing the greater electrical conductivity of the busbar (27). Connecting device (100) according to claim 4, characterized in that the first layer (29 ') made of stainless steel and the second layer (29 ") consists of copper or brass. Connecting device (100) according to claim 1, characterized in that the connecting element (8) is formed with a manually operable opening member (35) which presses the clamping spring (40) away from the clamping point (29) when actuated and thus removing the Contact lug (11) released from the clamp without the use of an additional tool. Connecting device (100) according to claim 1, characterized in that the connecting element (8) is formed with a latching member (31) which cooperates with a detent element (32) adapted thereto latching on the housing of the service switching device (1) when the clamping spring ( 40) clamps the contact lug (11) at the clamping point (29) and at the contact point (30) to the power rail (27) presses. Connecting device (100) according to claim 7, characterized in that the latching member (31) is a latching lug (33) on a one-sided resiliently clamped locking bar (34), and in that the corresponding latching element (32) on the housing integrally formed on the housing corresponding latching lug or a latching opening is. Connecting device (100) according to one of the preceding claims, characterized in that the connecting element (8) is a bus bar, which has an insulating profile (9) and wherein the connecting conductor is a pole rail arranged in the insulating profile (9). Connecting device (100) according to one of claims 1 to 8, characterized in that the connecting element is a connector for establishing an electrical connection between the terminals of a motor protection switch and a contactor. Connecting device (100) according to one of claims 1 to 8, characterized in that the connecting element is a turning connector.

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