ES2926699T3 - Device connection system with integrated protective cable connection for electrical devices and electrical device - Google Patents

Abstract

The invention relates to a plug with integrated protective conductor connection for electrical devices, the protective conductor connection being suitable for different supply voltages and the plug being configured in such a way that a device housing (2) with an opening housing insert (7) and a device connection system designed to correspond to the plug is connected to The plug can be connected with a power contact clamping spring (8) which is arranged on the outer contour of the plug and forms the protective ground connection, which can be connected mechanically and thus also electrically directly to the device housing (2). (Automatic translation with Google Translate, without legal value)

Description

DESCRIPTION

Device connection system with integrated protective cable connection for electrical devices and electrical device

[0001] The invention relates to a device connection system with an integrated protective conductor connection for electrical devices, which is suitable for different supply voltages and an electrical device.

State of the art

[0002] Electrical devices such as electric stoves, ovens, refrigerators, microwaves, dishwashers, processing machines in industrial production, vehicle diagnostic devices, etc. They require electrical power to function.

[0003] To ensure the electrical supply, most of these and other similar devices have a device connection system as a point of transfer of electrical energy between the electrical power line and the internal wiring of the device.

[0004] Devices with an operating voltage of more than 250 V, in particular, are also called connection terminals. This is necessary for the following reasons, such as:

- the connection cable of the electrical device must be interchangeable

- the device must only be completed with a country-specific device connection cable at the end of production

- the connection cable of the device is subject to greater mechanical and/or chemical stress and must therefore be more resistant than the internal wiring of the device and

- the internal wiring of the device is subject to higher thermal loads and must therefore have an insulation material that is more thermally resistant than the device connection cable.

[0005] Device connection systems are mounted in the industrial production of these devices by the device manufacturer within the manufacturing process on the outer wall of the device. In another manufacturing step, the network cable must be connected to the internal wiring of the device through the connection points. Depending on the system used, this can be done using various technologies, such as connecting the cores of the device connection cable and the internal wiring of the device using detachable connection technologies: screw terminals, plug-in contacts, spring terminals, displacement terminals, etc., and/or using permanent connection technologies such as heat welding, ultrasonic welding, soldering, pressing and the like.

[0006] Regardless of which of the mentioned connection technologies is used between the cores of the device connection line and the internal wiring of the device, two implementation steps are usually necessary for its implementation:

1. Installation of the device connection system in the insertion opening of the device wall. 2. Connecting the corresponding number of cores of the supply line with a corresponding number of internal wiring lines of the device, for example: in the case of an electrical device for alternating current and use of a protection measure against dangerous body currents, based on one protective conductor connection are three electrical connections. In the case of an electrical appliance for three-phase current and the same measure of protection against dangerous bodily currents, there are five electrical connections.

[0007] If the housing of the device is made of an electrically conductive material, which can assume a dangerous potential in case of failure, for example, contact with the body, and if protection against dangerous body currents is ensured by the use of a protective measure with a protective conductor connection, then a safe and low-impedance connection of the protective conductor on the internal wiring side of the device with the device housing must be ensured

[0008] According to the state of the art, the installation of the device connection system in the device housing and the connection of the protective conductor of the device connection cable to the conductive device housing are two separate technological steps that require time. additional mounting hardware and additional connection material.

[0009] In the publications DE 102005029384 A1, DE 102008009 142 A1, DE 102007057335 A1 and DE 102005040 241 A1, modular connection systems are described for making the electrical connection between the electrical installation of the building and the internal wiring of an electrical device.

[0010] However, the advantages of the described device connection systems shown in the publications require manufacturers of electrical devices significantly higher material and production costs and thus lead to higher costs.

[0011] The solution described in the publications DE 10 2007 057 335 A1 and DE 102005 040 241 A1 is only suitable for connecting the device connection cable to internal device wiring in the form of a printed circuit, such as an electronic circuit board , as this allows Plug contacts when plugging the box is avoided.

[0012] Regardless of this, the connection of the protective conductor to the device housing must be carried out in an additional technological step and using additional material.

[0013] The solutions described in DE 102005029384 A1 and DE 102008009142 A1 are severely limited to special applications due to their design. They also require the additional technological steps described above and additional materials to connect the protective conductor to the device housing.

[0014] According to DE 202013 101 698, a protective conductor contact system for electrical device connection systems is known which is suitable for different supply voltages. With this solution, a protective conductor connection tab is part of the device housing. The protective conductor connection tab is formed in an insertion opening for the device connection system and can be operatively connected to a correspondingly formed protective conductor connection contact of a device connection system.

[0015] Document US3810069A is understood to disclose the preamble of each of claims 1 and 2. Task

[0016] As cost and quality pressure continues to increase within industrial production, it is of vital importance that every manufacturer exploits all potential cost reduction potentials without compromising quality.

[0017] Therefore, the aim of the present invention is to propose a particularly cost-effective system for the direct connection of the protective conductor of the device connection cable to the device housing and/or to the internal wiring of the device in terms of production and assembly.

[0018] This system is intended to permanently guarantee the functional and electrical safety of the device and, at the same time, opens up significant potential savings in assembly time and assembly material for the user of the present invention.

[0019] The proposed solution aims to solve problems of previous approaches to contact the device casing, such as:

- Tolerances in the thickness of the material of the casing sheets

- Metal sheet coatings or metal sheet impurities

- Contact pressure force too low and contact surface too small

resolved sustainably and economically.

[0020] The solution must be able to be used in variants suitable for devices with three-phase or AC connection.

[0021] This object is achieved by a device connection system with an integrated protective conductor connection for electrical devices with the features of claim 1 and by a device connection system with an integrated protective conductor connection for electrical devices. electric devices with the features of patent claim 2 and an electric device according to claim 9. Advantageous configurations result from the respective dependent claims.

[0022] Through the use of connection technology that saves mounting time and mounting material, the mechanically safe and low-impedance connection of the potential of the protective conductor of the power supply network and the potential of the device housing already it is established during assembly of the device connection system in the insertion opening of the housing of the device to be supplied with electrical energy. As a result, an essential prerequisite for the safe operation of protective measures against dangerous body currents is already established by the installation of the device connection system.

[0023] The solution to this problem by means of the invention is also characterized by a device connection system with an integrated protective conductor connection according to claim 1 or 2, which is fixed on the external boundary surfaces or inside the device electric.

[0024] The device connection system with integrated protective conductor connection has a network or energy supply system the number of connection points required for the function of the device (screw contact points, welding points, spring loaded terminal points, offset terminal points insulation, fastening contact points, etc.) between the device connection cable and the internal wiring of the device.

[0025] In addition, if necessary, these connection points will be designed with contact elements for the realization of connections between the conductors, for example, phase L1 and phase L2, the so-called bridges.

[0026] Above all, the device connection system with integrated protective conductor connection has a suitable contact of the protective conductor of the power line directly with the device housing in such a way that the contact is made directly during mounting and not through an additional work step and using additional connection material.

[0027] This technical implementation ensures that when the device connection system with integrated protective conductor connection is inserted into the device housing, there is a mechanically and electrically safe and permanent connection of the potential of the protective conductor to the potential of the housing of the device and thus the prerequisite for protection against dangerous body currents are permanently ensured becomes.

[0028] To achieve this goal, the cutout of the electrical device housing into which the device connection system is inserted does not have to be enlarged to include a protective conductor connection tab or similar connection elements.

[0029] It is sufficient that at least one component of the device connection system with an integrated protective conductor connection has the new type of power contact clamping spring, which is suitably electrically connected to the protective conductor of the device connection line. The power contact clamping spring is characterized by high connection forces and large connection surfaces to the housing wall to ensure permanently low contact resistance between the mains protective conductor and the housing wall.

[0030] During assembly and after reaching the final mounting position of the equipment connection system with integrated protective conductor connection in the equipment housing, adequate design elements are ensured to determine and secure the position so that the Potential connection of the protective conductor between the power supply network and the device housing is reached safely and is permanently secured.

[0031] In device connection systems with integrated protective conductor connection with inseparable connections between the device connection lines and the internal wiring of the device, appropriate design measures, such as locking lugs, permanently ensure that the terminal and thus the protective conductor connection cannot be separated from the device.

[0032] In equipment connection systems with integrated protective conductor connection with separable connection between the equipment connection cables and the internal wiring of the equipment, the elongated design and/or the offset position of the protective conductor plug-in contact in the direction of connection to the network ensure that when the plug is removed from the socket, the current-carrying contacts are always removed first, and then the protective conductor is disconnected. This measure considerably increases the security of the device.

[0033] Due to the special design features, while simplifying the overall system at the same time, the invention has a number of advantages:

> Safe and durable connection between the mains protective conductor and the housing potential, even with different sheet thicknesses and different sheet coatings

> Simplification of sheet metal punching

> Reduced material and manufacturing costs of the device connection system with integrated protective conductor connection

> Possibility of a permanent and detachable connection between the connection cable of the device and the internal wiring of the device

> Production time savings through simultaneous insertion of the device connection system with integrated protective conductor connection and electrical connection of the protective conductor with the device housing

> Saving of additional materials for the connection of the mains protective conductor with the protective conductor of the device or the device housing

> Possibility of fully automatic production and testing of the device

> Simplification of the connection of the device to the electrical installation of the building.

Realization examples

[0034] Also included are the following embodiments.

[0035] A device connection system with an integrated protective conductor connection according to claim 1 or 2, wherein the device connection system is also designed as a channel and the channel has a protruding channel edge ( 20) at the upper end of the entire circumference, in which at least one position guide (19) and the power contact holding spring (8) protruding from the channel edge (20) are arranged in the outer area of the bucket of the device connection system.

[0036] Device connection system with integrated protection conductor connection according to claim 1 or 2, in which also a part of the device connection system that protrudes into the interior of the device (1) has a parallelepiped shape and at device connection end system that rests on the outside of the device casing (2), a stop collar (21) is arranged inside, towards the inside of the device casing (2), the power contact holding spring (8), which is mechanically and electrically operatively connected to the device housing (2).

[0037] Device connection system with integrated protection conductor connection according to claim 1 or 2, in which also a part of the device connection system that protrudes into the interior of the device (1) has a parallelepiped shape and in the end of the device connection system that rests on the outside of the device casing (2), a stop collar (21) is arranged inside, towards the inside of the device casing (2), are locking lugs (10) are provided, which are operatively connected to the device casing (2).

[0038] Device connection system with integrated protective conductor connection according to claim 1 or 2, in which the insertion opening of the housing (7) is also round, with at least two insertion recesses (22) that extend into the wall of the device casing (2) being arranged on its circumference and a part of the device connection system leading to the inside of the device protruding from the device (1) is designed to correspond, on which side of the system of the device facing the insertion opening of the housing (7) are arranged with an integrated clamping spring (14) at least one clamping element (23) designed to correspond to an insertion recess (22) and which they also correspond to the insertion recesses (22) and a designed power contact holding spring (8).

[0039] Device connection system with integrated protection conductor connection according to claim 1 or 2, in which the insertion opening of the casing (7) has any geometric design, in particular square or elliptical, so that in At least two protruding insertion recesses (22) and a part of the power contact holding spring (8) protruding into the interior of the device ( 1) is correspondingly configured in such a way that after the device connection system has been inserted into the housing insertion opening (7), it is possible that the device connection system can be rotated into a locking position.

[0040] An embodiment not claimed relates to a device connection system with integrated protective conductor connection, the power contact holding spring (8) being designed without trigger protection claw (13) as an alternative or additionally, the contact points between the clamping spring (14) and the housing wall of the device (2) are formed on the one hand in terms of surface and on the other hand in a quasi-linear manner.

[0041] The invention is explained in more detail below on the basis of various exemplary embodiments with Figs 1 to 14. Shown:

Fig. 1 an electrical device - dishwasher 1 can be connected via a device connection cable 4 with safety plug 3,

Fig. 2 a connection plug of the device 6 for rotary power systems in the installed position on the insertion opening of the housing 7 of the device housing 2,

Fig. 3 a complete device connection system with integrated protective conductor connection for three-phase devices consisting of two separable units, the device connection plug 6 with power contact holding spring 8 connected to the device connection plug 5 and to the device connection cable 4,

Fig. 4 a variant of the separable device connection system shown in Fig. 3 with an integrated protective conductor connection for three-phase devices as an inseparable embodiment,

Fig. 5 a device connection plug 6 for connecting AC devices installed in the housing 2 with connected device internal wiring 16 with the housing edge of the insertion opening 7 operatively connected and secured with the locking lugs 10 spring power contact retainer 8,

Fig. 6 a complete device connection system with integrated protective conductor connection for alternating current consisting of the device connection plug 6 integrated in the housing 2 and the connector plugged into the device connection plug 5 with the connection cable of the connected device 4 and the internal wiring of the device 16,

Fig. 7 is a detailed view of a power contact holding spring 8 actively connected to the housing of the electrical device 2,

Fig. 8 the enlarged detail view of a power contact holding spring 8 without housing,

Fig. 9 a possible embodiment of the device connection plug 6 for the device housing 2 with particularly high strength requirements and thus particularly minimalist housing insertion openings 7 in the installed position in the housing of device 2 in a perspective view,

Fig. 10 the detailed view of a variant of the power contact retaining spring 8 in side view with housing 2,

Fig. 11 the perspective view in Fig. 10 shows the power contact holding spring 8 in a side view,

Fig. 12 shows the possible embodiment of the device connector 6 in the installed position in front of the device housing 2 in a perspective view,

Fig. 13 shows the device connector 6 in Fig. 12 in the installed position from inside the device,

Fig. 14 the perspective view of a power contact holding spring 8 without trigger guard claw (13),

Fig. 15 an enlarged detail view of a power contact retaining spring 8 with mounting hole without housing and

Fig. 16 is a detailed perspective view of an alternative power contact holding spring 8 with vibration decoupled connection points for contact elements (phases and protective conductor).

[0042] The representation of the exemplary embodiments is based on the basic idea of the solution that the electrical and mechanical active connection of the protective conductor of the network with the housing of the device 2 via the holding spring of the power contact 8 is already safe and durable when the system connection with integrated protective conductor device connection is installed in the housing of the electrical device.

[0043] In embodiments that allow the non-destructive separation of the cores of the connection cable of the device 4 from the cores of the internal wiring of the device 16 - Figures 2, 3, 5, 6, 9, 12 and 13 - the contact of the protective conductor 17 is formed in its length and/or designed in its geometric position so that the current-carrying contacts 9 are separated from the connection plug of the device 6 before the contact of the protective conductor 17 when the connection plug of device 5 is disconnected. This measure significantly increases the security of the device.

[0044] For equipment connection system with integrated protective conductor connection with inseparable connections between device connection lines and device internal wiring - Figure 4 - is permanently secured by appropriate structural measures - e.g. eg latches - that the device connection system and therefore the protective conductor connection cannot be separated from the device.

[0045] As an example of an electrical device 1, Figure 1 shows a dishwasher with the possibility of connecting the device to the domestic electrical installation through the connection system of the device consisting of a safety plug 3, a connection cable device 4, a device connection plug 5 and a device connection plug 6.

[0046] Fig. 2 shows a device connection plug 6 of a device connection system with integrated protective conductor connection for three-phase devices in the installed position on the housing insertion opening 7 of the housing 2 of the device. phase three-phase device in the direction of the outer wall from the inner area of the device 1. The connection plug of the device 6 is channel-shaped and carries inside it the conductive contacts 9, to which the active power line is connected (not shown) by means of plug contacts. These conductive contacts 9 are in operative connection with contacts to which the internal wiring of the device 16 is connected or can be connected. power 8 through contact lug 11. The device connection plug channel 6 has a channel edge 20 protruding around the entire circumference. On this channel edge 20, two position guides 19 are formed on three sides of the device connection plug 6.

[0047] In the outer front area of the device connection plug 6 there is a power contact clamping spring 8 protruding from the channel edge 20, which after flat-parallel positioning of the device plug 6 in the opening of insertion of the casing 7 is guided by means of a sliding movement of the plug of the device 6 with its integrated power contact holding spring 8 in the direction of the edge via the position guides 19, the housing insertion opening 7 is mechanically and electrically connected with the device housing. At the end of the sliding movement of the power contact clamping spring 8 in the area of the edge of the insertion opening of the housing 7, the locking lugs 10 integrated on the opposite side of the device connector 6 and on the edge of the channel 20 secure the position of the device connector 6 and the power contact clamping spring 8 and thus ensure a permanent safe connection of the mains protective conductor and the potential of the device box.

[0048] Fig. 3 shows the equipment connection system with integrated protective earth connection for three-phase equipment composed of a separable male connector 6 and a device connection plug 5 with connected device connection cable 4, spring fastening of the power contact 8 and locking lugs 10 in the plugged connector and operatively connected state.

[0049] Fig. 4 shows a variant of the device connection system described in Fig. 3 with an integrated protective conductor connection for three-phase devices, in which the device connection plug 6 and the device connection plug 5 devices are designed as an inseparable functional unit, which are also called as connection terminals. This is inserted into the outer wall of the device housing 2 from the outside.

[0050] Fig. 5 shows a device connection plug 6 of a device connection system with integrated protective conductor connection for connecting AC devices installed in the device housing 2 with internal wiring of the connected device 16 seen from inside the device. The current-carrying connections are designed in a known manner.

[0051] The connection plug of the device 6 consists of a piece in the shape of a parallelepiped that protrudes inside the device 1 and at whose end the conductive contacts 9 are fixed. At the other end of the connection plug of the device 6 is arranged a stop collar 21. Locking lugs 10 are arranged on the stop collar 21 on the outside of the device housing 2, which secure the equipment connection plug 6 and the power contact holding spring 8 arranged on the stop collar 21 towards the inside of the device in its installation position in the insertion opening of the housing 7 and thus a permanently safe operational connection of the power contact clamping spring 8 connected to the network protection conductor with the device housing 2. When the device connection plug 6 is pushed into the insertion opening of the housing 7, which is more higher than the height of the device connection plug 6, it moves in the upper area of the housing insertion opening 7 until the stop collar 21 abuts against the outer wall of the device housing 2, so that the power contact holding spring 7 disposed at the bottom of the device connector 8 is placed on the outer wall of the unit. The device connection plug 6 is then pressed "down", whereby it reaches the end position with the power contact clamping spring 8 engaged in the edge of the housing insertion opening 7 of the housing of the device 2 and the locking lugs 10 engaged in the insertion opening of the housing 7.

[0052] Fig. 6 shows a complete device connection system for alternating current in functional arrangement, consisting of a device connector 6 installed in the device housing 2 shown in detail and the device connection plug 5 inserted with the connected device connector cable 4 and the internal device wiring 16 from the insertion direction of the device connection plug 5 into the device connection plug 6.

[0053] Figs. 7, 8 and 14 show two variants of the design of the power contact clamping spring 8, which can be used in the embodiments mentioned above.

[0054] Fig. 7 shows the detailed view of a power contact holding spring 8 which is operatively connected to the housing 2 of the electrical contact spring 8. This electrical contact spring 8 is made in one piece and has U-shaped. The end of one leg of the power contact clamping spring 8 is designed to protrude from the device housing 2 through incisions in such a way that the front end forms an insert bevel 12 and the opposite end forms a trigger guard claw 13. Both arms of the power contact holding spring 8 hold the device housing 2 and form the holding spring 14. On the side of the power contact holding spring 8 an end lug is arranged of contact 11. You can see the clamping and spring effect of the contact system which is ensured by excessively bending the clamping spring of the power contact 8 in the direction of the housing. The trigger guard claw 13 ensures that the power contact holding spring 8 is secured against detachment from the device housing. Tolerances or differences in the sheet thicknesses of the device housing 2 are compensated for by the clamping spring 14. The insertion chamfer 12 facilitates the mounting of the scraping contact spring .

[0055] Figure 8 separately shows the power contact clamping spring 8 shown in Figure 7. A particularly large contact surface 15 is also visible here, especially compared to contacts commonly used in the prior art generally known. The contact pressure of the clamping spring 8 of the power contact can be controlled in a wide range by the material and geometric shape of the clamping spring 14 together with the trigger guard claws 13.

[0056] Fig. 9 shows a possible embodiment of the device connector 6 for the device housing 2 with particularly high strength requirements and thus particularly minimal housing insertion openings 7 in the installed position on the housing of the device 2 in a perspective view.

[0057] The mechanical interaction between the clamping spring 14 of the power contact clamping spring 8 and its trigger guard claw 13 to establish optimal contact pressure forces between its contact surfaces 15 and the device housing 2 and the minimization of the contact resistances between the casing 2 and the protective conductor of the network can be seen particularly well.

[0058] In Figures 10 and 11, the possible embodiment of the power contact holding spring 8 operatively connected to the device housing 2 for special housing requirements as described in Figure 9 is shown. the interaction between the clamping spring 14 and the trigger guard claw 13 to compensate for tolerances in the metal sheets of the device casing 2.

[0059] FIG. 11 shows another possible embodiment of the power contact retaining spring 8 in a perspective view for electrical appliance housings in which the sheet metal section must be designed in a minimalist way for reasons of strength. This power contact retaining spring 8 is also designed in one piece and consists of a metal strip, one end of which has a U-shaped recess. This end is bent by two elbows in such a way as to create a quasi-triangle in cross section, with the original end protruding perpendicularly from the metal strip as a straight surface and forming the contact surface 15. In addition, almost below the contact surface 15 a claw-like element is notched. protection 13 on the metal strip. Due to the clamping spring 14 and the extraction claw 13 bent in the opposite direction, the contact pressure forces can be set particularly high and, at the same time, larger thickness tolerances of the casing plates can be compensated for.

[0060] In Figure 12, a further embodiment of the device connection plug 6 is shown in the assembled position in front of the device casing 2 in a perspective view. The basic structure corresponds to the embodiment according to Figures 5 and 6. Conductive contacts 9 and protective conductor contact 17 with contact lug 11 as connection element with clamping spring 14 are integrated in the connector of the device 6.

[0061] However, in this embodiment, the housing insertion opening 7 is round, around the circumference of which four insertion recesses 22 are arranged, which extend into the housing wall of the device 2. On the side of the Connecting plug 6 of the device facing the insertion opening of the housing 7, retaining elements 23 are arranged corresponding to the insertion recesses 22. At one point of the four retaining elements 23, instead of the retaining element holder 23, which is also designed to correspond to the insertion cutouts 22, a power contact holding spring 8 is arranged.

[0062] By inserting the device connection plug 6 into the housing insertion opening 7 in the direction of insertion according to the arrow X, the clamping elements 23 configured as a kind of locking tabs and the clamping spring of the power contact 8, which can be configured according to Figs. 7, 8 and 14, are pushed through the insertion opening of the device 7. As a result, the connection plug of the device 6 has reached its position of rotation. The device connection plug 6 is then brought into its final installation position by turning clockwise in the exemplary embodiment.

[0063] Figure 13 shows the connection plug of the device 6 shown in Figure 12 in the installed position from inside the device. The device connection plug 6 is shown in its final installed position, in which the retaining elements 23 and the power contact retaining spring 8 are locked behind the device housing wall 2 between the recesses of insertion 22.

[0064] Figure 14 shows an embodiment of the power contact holding spring 8 without the trigger guard claw 13, as shown in Figs. 7 and 8. The actual contact points between the clamping spring 14 and the housing wall of the device 2 are formed on the one hand on the surface and on the other hand in line form. This special embodiment is used in particular when the housing of the device 2 has special surfaces, eg galvanized, chromed, etc., and could increase the risk of corrosion or damage to the optics.

[0065] Figure 15 shows an enlarged detail view of a power contact clamping spring 8 with a fixing hole 24 without a housing. Via the fixing hole 24, an additional mechanical connection to the housing can be made. In addition, the electrical conductivity can also be improved. Fixation hole 24 may have a thread. Furthermore, the fixing hole can be designed as an elongated hole. In general, the fixing hole 24 serves as a connection means.

[0066] Figure 16 shows a detailed perspective view of a power contact holding spring 8 alternative with vibration-decoupled connection points with contact elements. The individual phases and the protective conductor can be attached to these connection points by means of a solder contact 26. Alternatively, the contact options described above are implemented. Vibration decoupling for mechanical vibrations is realized in particular by relief molding 25.

Reference number list

[0067]

1 electrical device: dishwasher

2 device casing

3 safety plug

4 device connection cable

5 device connection socket

6 device connection plug

7 housing insertion opening

8 power contact retaining spring

9 conductive contacts

10 locking lugs

11 contact lug

12 insert bevel

13 trigger guard claw

14 holding spring

15 contact surface

16 device internal wiring

17 protective conductor contact

18 connection terminal

19 position guides

20 channel edge

21 stop collar

22 insertion cutouts

23 fasteners

24 fixing hole

25 relief molding

26 solder contact

Claims (9)

1. Device connection system with integrated protective conductor terminal for electrical devices, which is suitable for different supply voltages, in which a device housing (2) has a housing insertion opening (7) for the correspondingly configured device connection system, wherein the device connection system has at least one power contact holding spring (8) and the at least one power contact holding spring (8), which is arranged on the outer contour of the device connection system and forms the terminal of the protective conductor, they can be mechanically and thus also electrically operatively connected directly to the device housing (2) and the holding spring of the power contact (8) is formed as one piece and is U-shaped, characterized because the end of one leg of the power contact retaining spring (8) is toothed to protrude from the device housing (2) in such a way that the front end forms an insertion bevel (12) and the opposite end forms a claw trigger guard (13), in which in the operatively connected state the two legs of the power contact holding spring (8) firmly enclose the wall of the device housing (2) and form a holding spring (14 ), so that contact is established between a protective conductor of the power cable and the housing of the device when the device connection system is installed in the insertion opening of the housing, without an additional operating step and without the use of additional connection devices. 2. Device connection system with integrated protective conductor terminal for electrical devices, which is suitable for different supply voltages, in which a device housing (2) has a housing insertion opening (7) for the Correspondingly configured device connection system, wherein the device connection system has at least one power contact holding spring (8) and the at least one power contact holding spring (8), which is arranged on the outer contour of the device connection system and forms the terminal of the protective conductor, it is mechanically and therefore also electrically functional connectable directly to the device housing (2), characterized because The power contact retaining spring (8) is formed in one piece and consists of a metal strip, one of its ends having a U-shaped cutout, said end being bent by means of two angled sections in such a way so that in cross section almost a triangle is formed, in which the original end protrudes perpendicularly from the metal strip as a flat surface and forms a contact surface (15), and almost below the contact surface (15) there is a notch in the metal strip as a trigger guard claw (13), so that contact is made between a protective conductor of the power cable and the device case when the device connection system is installed on the device. housing insertion opening, without an additional operating step and without the use of additional connection devices. 3. Device connection system with integrated protective conductor terminal according to claim 1 or 2, characterized in that the device connection system is channel-shaped and at the upper end of the total perimeter the channel has a protruding channel edge (20), in which on several sides and on each of these sides at least one position guide (19) is formed, and the power contact clamping spring (8) protruding from the edge of the channel (20) it is arranged in the outer zone of the tray of the connection system of the device. Device connection system with integrated protective conductor terminal according to claim 1 or 2, characterized in that in an operatively connected state a part of the device connection system protruding inside the device (1) has a parallelepiped shape and a stop edge is provided at the end of the device connection system that rests on the outside of the device casing (2), inside which stop edge, facing the inside of the device of the device casing (2), the power contact holding spring (8) is arranged, which is mechanically and electrically operatively connected to the device housing (2). Device connection system with integrated protective conductor terminal according to claim 1 or 2, characterized in that in an operatively connected state, a part of the device connection system protruding into the interior of the device (1) is in the form of parallelepiped and a stop collar (21) is arranged at the end of the device connection system that rests on the outside of the device casing (2), inside whose stop edge, facing the inside of the device On the device casing (2), locking lugs (10) are provided, which are operatively connected to the device casing (2). Device connection system with integrated protective conductor terminal according to claim 1 or 2, characterized in that the device connection system and the power contact holding spring (8) can be disconnected from the device housing ( 2) non-destructively. Device connection system with integrated protective conductor terminal according to one of Claims 1 to 6, characterized in that the power contact holding spring (8) has a connection device (24). Device connection system with integrated protective conductor terminal according to one of claims 1 to 7, characterized in that the power contact holding spring (8) has a protective conductor terminal Vibration isolated protection. 9. Electrical device having a device connection system according to one of claims 1 to 8.