EP3365948A1

EP3365948A1 - Receptacle having an identification means

Info

Publication number: EP3365948A1
Application number: EP16781832.7A
Authority: EP
Inventors: Piotr Komor
Original assignee: Bals Elektrotechnik GmbH and Co KG
Current assignee: Bals Elektrotechnik GmbH and Co KG
Priority date: 2015-10-19
Filing date: 2016-10-17
Publication date: 2018-08-29
Also published as: DE102015117789A1; WO2017067886A1; KR20180061244A

Abstract

The invention relates to a receptacle (1) for producing an electrical plug-in connection to a complementary plug (2, 2'), wherein the receptacle has at least a first and a second contact socket (1a, 1b) for contacting at least a first and a second electrical contact of the plug (2, 2'), which are designed as a first and a second contact pin (2a, 2b) for contacting the first and the second contact sockets (1a, 1b) of the receptacle (1). The receptacle (1) has an identification means (5) for identifying a plug (2, 2') inserted into the receptacle (1), wherein the identification means (5) is designed to actuate an electrical switching means (6) of the receptacle, in particular in order to switch on the power supply of the receptacle (1), in response to a plug (2, 2') identified as inserted into the receptacle (1) and, in dependence on a plug identified as a predetermined type, to couple an identification signal into the plug (2), by means of which identification signal the receptacle (1) can identify itself to the plug (2) as a receptacle (1) of a type corresponding to said predetermined type.

Description

Socket with identification means The invention relates to an electrical socket for

Producing an electrical connector with a complementary electrical connector and a system

comprising an electrical socket and a complementary electrical connector.

Electrical sockets, also referred to as electrical couplings or electrical sockets, and electrical

Plugs are electrical connectors and are

known to be used mainly for indoor or outdoor use. They serve to connect one

electrical line to an electrical device or a stationary electrical installation or for connecting two electrical, in particular flexible, cables or cables.

Connectors such as plugs and sockets, therefore, are used for electrical connection between an electrical

Device or installation and a socket, wherein at least one connector, usually the plug, can be connected to the electrical line. The socket is usually the connector to be connected to a connected to a power source electrical line. To produce an electrical plug connection between socket and plug so for mating two such complementary connector on a plug complementary to the socket, the socket has at least one first and a second contact socket for contacting with at least a first and a second electrical contact of the plug, which are each formed as a first and second contact pin for contacting with the first and second contact socket of the socket. The electrical pins are here for a

electrical and mechanical contacting in the

To insert contact sockets. When connecting electrical electrical

Facilities or installations or electrical

Consumers, that is so when plugging plugs into sockets, which these facilities or

Installations or electrical consumers are assigned or assigned, often raises the problem that it is not known which type of electrical

Socket is present.

For example, electrical sockets may vary according to the type of socket electrical

Be associated hedges with respect to a maximum current load and / or an existing voltage or voltage. In addition, electrical outlets may vary depending on

Socket type, for example, on different cable cross sections of power lines to

Power supply of the outlet to be installed,

For example, at cable cross-sections of 1.5 mm ² or 2.5 mm ² , based on this case, sockets that are installed on cable cross-sections of 1.5 mm ² , then assigned to a different type of sockets or are assignable, as sockets that on

Cable cross-sections of 2.5 mm ^{2 are} installed.

Is therefore a socket whose type can not be known and / or can not be guaranteed, a

connected electrical consumer, this may either lead to an overload or a Fehlbelastung, or to an insufficient use of the

Potential of the socket. In the latter case, this leads to disadvantages in the comfort or usability of an electrical consumer connected to the socket.

A possible application example to explain this

The problem is, for example, the charging of batteries or accumulators of electric vehicles to electrical

Sockets, in particular to household standard

Protective contact sockets.

Although a socket is basically set up or designed to provide a high continuous current for fast charging of the battery, this type of

However, the socket is not known, or can not be attributed with sufficient certainty, the user of the

Electromobiles or electronics, especially a

Charging electronics, preferably a charging cable or a charging line for the scooter, such as a mobile AC charging cable with vehicle charging connector and integrated control unit (IC-CPD charge controller, English, for "In-Cable Control and Protecting Device"), to

be forced to set a low charging current to ensure that the socket and / or the

Charging electronics or the scooter safely operated and not destroyed. From FR 2 949 280 and WO 2007/072581 sockets are known which identify an electrical plug which is plugged into a socket, said

Information about the plug is transmitted to the socket when the plug is plugged into the socket, so that after plugging in or at a plugged

Plug the power of the socket is activated. Furthermore, it is known from US 2014/0120764 AI, a

Signal to be transmitted to a plug, this is plugged into a power outlet.

A disadvantage of this prior art, however, is that it does not disclose a teaching by which both a socket of a predetermined type over a

Plug, in particular clearly identified, as well as a plug connected to the socket

can be identified and this information also also connected to an electrical outlet

Device is transmitted, so that this information both plug and socket side to

Further processing is present, preferably by one or more switching means and / or electronics.

Another disadvantage of the prior art is that a socket which transmits an identification signal to a connector must always be matched to the technical transmission principle used and vice versa. Thus, according to the prior art always only one system consisting of a specific outlet and a

certain connector, which therefore each corresponding technical features in terms of technical Has transmission principle, such as

Optocoupler transmitter / optocoupler reader or magnetic / reed contact, are used. A simple interchangeability or universality of plug and socket is therefore not given.

Accordingly, it is an object of the invention

in particular, in a simple manner to solve or further develop the above-mentioned problems of the prior art, to identify an electrical outlet, in particular safe and unambiguous in terms of their type, by an electrical connector and equally with a device connected to the socket communicate.

Preferably, the electrical outlet after the

Connections can be operated under full utilization of their potential permanently and long-term, without destroying neither the outlet nor a consumer connected to it via a plug and / or its

Usability is impaired or its potential is not exhausted.

Appropriately, this outlet should also be a light

Enable interchangeability with conventional sockets and can also take over additional switching functions, such as the closure of electrical

Circuitry for switching signals, etc. In addition, it should also be possible that the socket for all conventional, complementary plug, which have no corresponding to the socket type, also used as a power source or remains contactable. Thus, the inventive

Socket for any consumer such as lawn mowers, etc. remain usable and also comply with these consumers according to standard,

for example, with regard to the required clearances and creepage distances, and also the ability of the

Keep switching function. Corresponding relevant standards are, for example, the standards IEC 6181-1, IEC 60884-1, VDE 0620, NF C61-314.

The object is achieved by a socket and a system for producing an electrical plug connection of a socket with a complementary plug according to one of the independent claims.

The socket according to the invention has at least a first and a second contact socket for contacting

at least a first and a second electrical contact of the plug, which are in particular designed in each case as a first and second contact pin for contacting with the first and second contact socket of the socket.

In other words, for this purpose, for mating the socket and the plug, the contact pins in the contact sockets for electrical and mechanical contact

to be plugged in.

Furthermore, the socket according to the invention has a

Identification means for identifying a plugged into the socket plug, wherein the

Identification means is formed on the one hand, in response to a plugged into the socket identified plug an electrical switching means of the socket, in particular for switching on the power supply of the socket to operate. On the other hand that is

Identification formed, depending on a connector identified as a predetermined type

To couple identification signal into the plug, with which the socket opposite the plug as

Socket one of this predetermined type

corresponding type can identify.

Advantages of the invention thus result in particular from the fact that a socket according to the invention, which belongs to a fixed predefined type of sockets, has an identification means which is of this type

Sockets is assigned uniquely.

As a result, the identification means fulfills a

Dual function. On the one hand, it fulfills the function that in a plug complementary to the socket only the identification signal is coupled, albeit a predetermined type of outlet with a

predetermined type of the plug corresponds, that is, the socket identifies itself as a socket of a type complementary to this predetermined type.

In addition, however, the identification means also fulfills the function that, in response to a plug inserted into the socket as an electrical

Switching means of the socket is actuated. The actuation of the switching means is thus effected as soon as a

Pairing the outlet is done with a plug that

Plug is thus complementary to the box, regardless of the type of plug. The switching means of the socket preferably causes the socket to be powered. This can be ensured on the one hand that the socket is de-energized when no plug is inserted into this. In addition, sparking and related

Avoiding wear on the first second contacts of the plug and the socket, which would occur when already voltage is applied to the first and second contacts of the socket when the plug is plugged into the socket.

As a result, such a trained

It is therefore preferably designed so that this only after the complete insertion of the plug into the socket, the electrical connection to the plug via the switching means produces and when pulling out the plug this electrical connection via the switching means first separates before the electrical connection between the first and second contacts of the plug and the

Socket to be disconnected.

In an alternative or in a supplement of the invention, it is also possible that the identification signal is switched by the electrical switching means and the

Coupling of the identification signal in the plug via this switching means takes place or is activated,

for example in the form of a digital and / or a coded signal and preferably by transmission via the first and second contacts of the socket and the

Plug. Compared to the prior art, it is thus also possible that the design of a

Identification signal is freely selectable, so there are no restrictions with regard to the technical transmission principle and a universality exists with regard to the technical transmission principle. For example, the signal sequence, the signal curve, the

Signal strength, etc. are determined freely.

Further advantages and features of the invention will be apparent from the following exemplary description of preferred embodiments with reference to the accompanying drawings.

In the drawings show:

1 shows a view of a front side of a socket according to the invention,

Figure 2a and 2b is a view of an inventive

System comprising a socket according to Figure 1 and a complementary plug one with the socket

corresponding type from below or from the side with partial cutouts and when not plugged in,

Figure 2c is a view of an inventive

Plug connected to a charging cable with an optional

Electronics and an optional temperature measuring element is connected,

Figure 3a and 3b is a view of an inventive system comprising a socket according to Figure 1 and a complementary plug one with the socket Corresponding type in the partially inserted state from below and from the side with partial cutouts,

Figure 4a and 4b is a view of an inventive system comprising a socket according to Figure 1 and a complementary plug one with the socket

corresponding type in the fully inserted

Condition from below and from the side with partial cutouts, Figure 5a and 5b is a view of an inventive

Socket comprising a socket according to Figure 1, in which although a complementary plug, but a not corresponding with the socket type, is inserted. It should be noted that the same components are assigned the same reference numerals in the figures.

The example shown in Figure 1

The socket according to the invention is a socket, which is also referred to as a type E socket and usually in

France is used, the invention in all nationally and internationally known types or types of sockets and systems of sockets and plugs with at least a first and a second contact application and any embodiments of

Grounding systems or grounding contacts can find.

Accordingly, in Figure 1 as a grounding contact a single, centrally located grounding pin 8, but no grounding springs as shown in a socket type F and no Erdbuchsenkontakt as in a known as socket type J grounded contact socket, at to which the invention may preferably also be applied.

Accordingly, it is of course also within the scope of the invention to apply these, for example, to socket and / or socket / plug systems and / or earthing systems, as are known, for example, in China, the USA or the United Kingdom (UK).

Figure 1 shows the socket in a front view with an open protective cover 7, so that the view of the first and second contact socket la, lb is released.

These are used to make contact with a first and a second electrical contact of a complementary connector and to transfer power from the socket to a consumer connected to the socket, that is to an electrical device or installation to the latter

Power supply.

For fastening the socket, for example on the wall or on a housing, the socket expediently has four holes 9, 9 ', 9' 'and 9' '' for fastening means.

According to FIGS. 2 a to 5 b, a plug complementary to the socket 1 has at least one first and one second electrical contact 2 a, 2 b, which are respectively designed as first and second contact pins for contacting with the first and second contact socket 1 a, 1 b of the socket 1, so that power can be transmitted to a consumer, wherein in the figures, neither a cable nor consumers are shown, which are to be connected to the plug 2. For mating the socket and the plug, i. for producing an electrical

Plug connection, the contact pins 2a, 2b in the Insert female contacts la, lb for mutual electrical and mechanical contacting.

The socket 1 is further assigned to a predetermined type of socket, for example, this socket 1 is secured or designed with a fuse for current load loads of 16 amps and 3.7 KW for charging batteries of electric vehicles. Furthermore, this outlet might be installed for example at a cable cross section of 2.5 mm ² and thus a different type of

Sockets are assigned as sockets that

for example, at cable cross-sections of 1.5 mm ²

are installed.

For this purpose, the socket 1 a

Identification means 5 (see Fig. 2a to 5b) for

Identification of a plugged into the socket 1

Plug 2 on. Depending on an identified as a predetermined type connector can hereby

Identification signal are coupled into the connector 2, with which the socket 1 relative to the plug 2 as a socket 1 of a predetermined this type

can identify the corresponding type. A to

Socket corresponding type of a complementary connector is shown in Figures 2a to 4b, a non-corresponding to the socket type of a

complementary plug is shown in Figures 5a and 5b.

The identification means 5 is also designed to actuate an electrical switching means 6 of the socket, in particular for switching on the power supply of the socket 1, in response to a plug inserted into the socket 1 identified. The operation of the However, switching means is effected as soon as a mating of the socket with a complementary plug takes place, regardless of the type of plug. For this purpose, the identification means 5 is suitably movably arranged between two positions such that upon insertion of a complementary plug into the socket 1, the identification means 5 is moved from a first position to the second position, in which the actuation of the switching means 6 takes place, as below

described in more detail.

Compared to the prior art also results in

Advantage that the identification means of the plug in the region of the collar or front portion of the housing, by external signals and influences is difficult to manipulate, since the identification only by the associated

Position of the identification means of the socket can be done. In addition, the identification means also does not affect the electromagnetic compatibility of the entire connector.

According to Figures 2a to 5b, the socket further

expedient to an electrically conductive identification means 5, which in a in Figs. 2a to 4b illustrated connector 2 of the corresponding type a

Identification circuit of the plug 2 closes to couple the identification signal. According to this

exemplary embodiment forms the

Identification means 5 expedient an electrical

conductive, in particular in a non-plugged state potential-free contact bridge with two contact surfaces 51 and 52, in particular contact pins, made on the Front of the socket 1 protrude and on the

Rear side by a connection 53 with each other electrically conductive, for example, via an electrical

Resistance, are connected. This does not mean that the contact surfaces 51 and 52 via a socket housing

stand out. Also, e.g. to further increase the security against manipulation by means of a

predefined resistance value of such a resistor, which is not shown in the figures for reasons of clarity, a concrete current, voltage and / or signal value of the identification signal for coding

To be defined.

Rather, it is sufficient if the contact surfaces 51 and 52, as seen in the figures, so within the

Outlet housing projecting that they are arranged freely accessible for each complementary plug coming from the front of the socket 1 forth.

Furthermore, according to this exemplary embodiment of the invention, the complementary plug 2 of the type corresponding to the socket 1 expediently has a third and / or a fourth electrical contact 3, 4 as part of the identification circuit, which is connected to the

Identification means 5 of the socket 1 cooperates. Such a contact is or such contacts 3, 4 are therefore designed appropriately, the coupling of the

Identification signal as well as pressing the

Switching means 6 by the identification means to

cause .

As further shown in FIGS. 2a to 4b, the third and the fourth electrical contact 3, 4 of the plug 2 are expediently in a housing 2c of the plug 2, preferably also recessed against the end face, introduced and on a front side of this housing 2 c of the

Identification contactable. In an alternative or additional embodiment of the invention, is or are the third and / or fourth electrical contact 3, 4 in the plug, preferably in the housing 2c, movable, in particular resilient, arranged.

As shown in Figures 2a to 4b

Embodiment is the coupling of the

Identification signal in the identification circuit of the plug thus expediently connected via the two electrically connected via the connection 53

Contact surfaces 51, 52 of the electrically conductive

Contact bridge 5. Alternatively, it would also be possible to couple the coupling of an identification signal, for example as a 1-pole signal, only one of the third or fourth contacts 3, 4 and expediently the actuation of the switching means 6 by the identification means

cause .

As a result of the contacting of the contacts 3 and / or 4 with the contact surfaces 51 and / or 52, a movement of the identification means 5 is also effected overall for actuating a switching means 6.

Compared to the prior art, it is due to the

Transmission of the identification signal by third

and / or fourth contacts thus further possible that the configuration of an identification signal is freely selectable so there are no restrictions in terms of technical transmission principle or a universality with regard to the technical transmission principle. For example, the signal sequence, the signal curve, the signal strength, etc. can be freely determined, for example by an electrical resistance, wherein the source and / or of course the device for

Verification or verification of the

Identification signal is preferably an electronic device such as an IC-CPD, or other electronics.

Overall, therefore, a coding and / or

Verification of an identification signal, whether there is a corresponding to a predetermined type of a plug type of a socket, be implemented in various ways.

Fig. 2c shows schematically a plug 2, whose

electrical contacts 3 and 4 are expediently connected to an electronics 70, which is expediently incorporated in a charging cable 80, which, for example, on a

Electric vehicle is connected. The electrical

Connecting lines of the contact pins 2a and 2b are not shown in Fig. 2c.

Fig. 2c also shows a further embodiment of the invention, optionally also a temperature measuring element 10 such as a PTC or NTC is introduced into the plug 2, in particular the temperature of the

Plug 2 monitors and expedient the measured

Temperature signal to the electronics 70 via the charging cable 80 transmits. The electronics 70 may preferably further be formed with suitable logic similar to that of the

Temperature measuring element 10 can evaluate monitored temperature and in dependence thereon a corresponding Control signal generated or modified, which contains information about how to the measured temperature of the

Plug is reacting. For example, when a temperature threshold is exceeded, the

Identification signal changed or interrupted, the electronics receive a signal for switching off and / or the parameters for the charge of the battery of the scooter are changed. Figures 3a to 4b also show the course of a plugging operation of the complementary plug 2 in the

Socket 1. Figures 3a and 3b show here a partially inserted plug 2 and Figures 4a and 4b the final state, that is a fully plugged plug.

According to FIGS. 3 a and 3 b, the contact surfaces 51 and 52 of the identification means 5 embodied as an electrically conductive contact bridge suitably touch the electrical contacts 3 and 4 of the plug 2 already in the case of a plug 2 partially plugged into the socket 1, so that via the electrical connection 53 (FIG. see Fig. 2a), in which

Plug 2 not shown

Identification circuit of the plug 2 is closed or is to couple an identification signal in the plug 2.

Accordingly, the identification signal can be useful from the side of the plug coming via one of the electrical contacts 3, 4 transmitted to the electrically conductive contact bridge and from there via another of the electrical contacts 3, 4 in the plug on or fed back. Appropriately, the closure of such

Identification circuit cause the connected to the plug 2 consumer or the electrical device or installation or its electronics, the possibility of removing a higher current and / or voltage and / or a particular voltage or

Detects current signal as well as actually takes.

Figures 4a and 4b, which is a complete

represent plugged state, illustrate in a comparison with the figures 3a and 3b that the

Identification means 5 is expediently arranged movably between two positions. Accordingly, at

Inserting the plug 2 into the socket 1 the

Identification means moves from a first position (see Figures 3a and 3b) to the second position (see Figures 4a and 4b) in which the actuation of the switching means 6 takes place, e.g. in this case by the connection 53, the actuation of an actuating element 61 of the

Switching means 6 takes place.

By contrast, FIGS. 5a and 5b show a view of a socket according to the invention according to FIG. 1, into which a conventional plug 2 'according to the prior art

is inserted, that is to the socket though

is formed complementary, but not to the type of

Socket corresponds and thus has no corresponding third and fourth electrical contacts 3, 4.

However, the identification means 5 is also moved from the first to the second position by such a plug 2 ', e.g. by contacting the

Identification means 5 over a wall portion 2d of the plug 2 '. An actuation of the switching means 6 can Consequently, also in this case, that is, when using a plug according to the prior art, carried out, for example, to supply consumers with low power consumption.

As a result, the identification means 5 is configured to respond to a plug 2 or 2 'plugged into the socket 1 as electrical

Switching means 6 of the socket to operate such that in an end state of the plug-in, that is, when a completely plugged into the socket 1 plug, the switching means is thus actuated or activated.

Preferably, however, the actuation or activation of the switching means 6 causes the power supply of the socket 1. Alternatively, however, other or further switching applications are conceivable, such as activating a monitoring or electricity meter device or the activation of the identification signal, which couple into the plug 2 is.

In contrast to a connector according to Figures 2b to 4b of a system according to the invention, takes place in a plug 2 'according to Figures 5a and 5b, however, no coupling of an identification signal in the plug, so that the socket 1 with respect to the plug 2' not as a socket identified to the type of connector 1 corresponding type.

In an opposite case, which is not shown in the figures, one would appear in FIGS. 2a to 4b

illustrated plug 2, which is designed to correspond to a predetermined type of socket 1, when plugged into a conventional complementary Socket according to the prior art also no

Identification of the socket and cause no closure of an identification circuit. As a result, takes place at a socket 1 after the

Invention, an actuation of the switching means 6 and the coupling of an identification signal in dependence of a predetermined type identified plug. It should be noted at this point, however, that within the scope of the invention embodiments of sockets not shown in the figures are also included, which have an identification means which does not form an electrically conductive contact bridge and / or have no or only a single contact surface.

In this case, the identification means is advantageously designed to receive an identification signal via the first and second contacts 1a, 1b, 2a, 2b of the socket 1 and the plug 2 and back into the plug

to couple.

As an identification means in this case, for example, a control or switching electronics on the side of

Socket 1 suitable, which the identification signal from the plug 2 and of an electronics of it

connected consumer receives and the switching means 6 is actuated.

Suitably, an identification signal also electronically encoded from the plug to the socket and / or

vice versa be transmitted or coupled, wherein the identification signal is also formed as a digital protocol or as an analog signal, and / or with the Current signal is modulated or mixed, which from the socket to the consumer to supply it

is transmitted. Thus, e.g. again over one

electrical resistance with predefined resistance value, a specific current, voltage and / or signal value of the identification signal for coding can be set or defined.

In a further alternative or supplement, it is also possible to differently encode various systems according to the invention, comprising a plug and a socket, for example by different ones

geometric arrangements or embodiments of

electrical third and / or fourth contacts of the plug and / or the identification means or the electrical

Contact bridge or the attached pins, so that only a first predetermined type of a first

Socket corresponds to a first connector, while a second predetermined type of a first socket corresponds only to a second connector and the first socket or the first connector does not correspond to the second socket or the second connector.

In a further alternative or supplement to the invention, the third and / or fourth contacts 3, 4 of a plug 2 and / or the contact pin 51, 52 of the as

electrical contact bridge trained

Identification means 5 preferably also special, advantageous base materials, finishes and / or

Have geometries, including, for example, the technical implementation of a coding. Reference sign:

1 socket

la first contact socket

lb second contact socket

2 plugs of the corresponding type

2 'plug of a non-corresponding type 2a first electrical contact / contact pin

2b second electrical contact / contact pin

2c housing of the plug

2d wall portion of the plug 2 '3 third electrical contact

4 fourth electrical contact

5 Identification means, electrical contact bridge 51, 52 Contact pin of the electrical contact bridge 53 connection

6 switching means

61 actuator

7 protective cover

8 grounding pins

9, 9 ', 9' ', 9' '' holes

10 temperature measuring element

70 electronics

80 charging cables

Claims

Claims :

1. socket (1) for producing an electrical

Plug connection with a complementary plug (2, 2 '), wherein the socket at least a first and a second contact socket (la, lb) for contacting with

at least a first and a second electrical contact of the plug (2, 2 ') which are each formed as first and second contact pins (2a, 2b) for contacting with the first and second contact socket (la, lb) of the socket (1) , characterized in that the socket (1) an identification means (5) for

Identification of a connector (2, 2 ') plugged into the socket (1), wherein the identification means (5) is formed, in response to a plug (2, 2') plugged into the socket (1), electrical switching means (6) the socket, in particular for switching on the power supply of the socket (1), to actuate, and depending on an identified as a predetermined type connector to couple an identification signal in the plug (2), with which the

Socket (1) relative to the plug (2) as a socket (1) of a type corresponding to this predetermined type can identify.

2. Socket according to claim 1, wherein the

Identification means is movably arranged between two positions, such that upon insertion of the plug (2) into the socket (1) the identification means a first position is moved to the second position, in which the actuation of the switching means (6) takes place.

3. Socket according to claim 1 or 2, wherein the

Identification means (5) is electrically conductive and is formed in a plug (2) of the

corresponding type to close an identification circuit of the plug (2) to couple the identification signal.

4. Socket according to claim 3, wherein the

Identification means (5) an electrically conductive, in particular potential-free, contact bridge with two

Contact surfaces (51, 52) forms, which of the

Front side of the socket (1) coming forth, are freely accessible for each complementary plug, and on a back of the socket (1) with each other

are electrically connected.

5. System comprising a socket according to claim 1 or 2 and a plug complementary to this socket (1), wherein the identification means (5) is electrically conductive and is formed in the plug (2) one

Identification circuit of the plug (2) to close to couple the identification signal.

6. System according to claim 5, wherein the identification means (5) has an electrically conductive contact bridge with two

Contact surfaces (51, 52) forms, which on a

Front of the socket (1) coming forth, are arranged freely accessible to the plug, and are electrically connected to each other on a back of the socket (1).

7. System according to one of claims 5 to 6, such

trained that in a first step of the

Insertion of the plug (2) into the socket (1) of the electrical contact between the first contact pin (2a) and the first contact socket (la) and the electrical

Contact between the second contact pin (2b) and the second contact socket (lb) is to close, and in a second step following the first step of

Insertion the identification signal in the connector (2) can be coupled.

8. System according to claim 7, wherein the actuation of the

Switching means (6) in one on the second step

following, third step of inserting the

Plug (2) into the socket (1).

9. Connector for a system according to one of claims 5 to 8, wherein the plug (2) has a third and / or fourth

Contact (3, 4) as part of the identification circuit and the identification means (5) with the third and / or fourth contact (3, 4) of the plug (2)

cooperates, this contact or these contacts (3, 4) is formed or are, the coupling of the

Identification signal as well as pressing the

Switching means (6) to cause by the identification means.

10. Plug according to claim 9, wherein the third (3) and / or the fourth contact (3) of the plug (2) in a housing (2c) of the plug (2) is introduced and are on the front side of this housing of the identification means (5) is contacted or are.