EP1032005A2 - Electrical installation - Google Patents

Abstract

The electrical installation (1) has at least one electronic control (2) coupled to an installation module (3), with at least one switching device (5) and a fuse (6) inserted in the electrical connection lines (4) between the electronic control and the installation module. The fuse is provided by a plug-in device (9) releasably fitted to a socket (10) for providing the electrical connection between 2 sets of terminals (7,8), coupled to the electronic control and the installation module.

Description

The invention relates to an electrical system with at least one control electronics and a system module that can be connected to this, in an electrical connecting line at least one switching device between the control electronics and the system module and a fuse and terminals for connecting the system module to the electrical Connection line are arranged.

Such an electrical system must be started before maintenance work, repairs or the like are switched off. This is done via the switching device, which interrupts the electrical connection between the system module and control electronics. The system module can then be serviced or replaced, for example or other components between the fuse electronics and the system module serviced or replaced.

Such a voltage isolation of the electrical system is particularly in such Areas where there is a risk of explosion, i.e. in so-called Ex areas.

By disconnecting the voltage, a process sequence of the electrical system is in particular interrupted in continuously running processes, whereby the electrical Plant essentially stops during this interruption. This leads to increased Costs. In addition, the electrical system due to the large number of components, such as for example, the switching device for each system module and the additional wiring such a switching device is relatively complex, which leads to additional Costs for the many different components and their time-consuming assembly leads.

The invention lies in view of the prior art known from practice the task of an electrical system of the type mentioned to improve that this is simplified and switch off the electrical System is avoided as much as possible, with the electrical system simultaneously is cheaper to manufacture and operate.

This task is related to the features of the preamble of the claim 1 solved in that the fuse is arranged in a plug-in module, which is detachably plugged into a base part, the first clamp for connecting the system module and second terminals for connecting the control electronics, one electrical connection between the first and second terminals via the inserted Plug-in module is formed. The plug-in module can be easily secured with Base part can be solved, which already creates the electrical connection between control electronics and system module is interrupted. By removing the plug-in module only this electrical connection is interrupted and not the entire one System or larger system parts are switched off. By arranging the Clamps in or on the base part, this also serves for electrical connection of the system module and the control electronics, so that separately arranged terminals can be omitted. Because of this simple way of de-energizing, you can individual system modules for maintenance purposes, repairs or the like quickly and safely disconnected from the electrical system.

The plug-in module is also very compact and can be carried by maintenance personnel to prevent the system module from being accidentally switched on again. This is particularly important if the system module is relatively far away is arranged by base part and plug-in module, which is usually the case.

When used in hazardous areas, it is also important that the corresponding system module is selected first is switched off and only then is the fuse completely removed becomes. This can be achieved according to the invention in that the plug-in module simultaneously can be arranged as a switching device in at least two positions relative to the base part is, system module and control electronics in the first connection position electrically connected and electrically separated from one another in the second disconnected position are. This means that the plug-in module is first moved from the connection position to the disconnected position moved, whereby the system module is de-energized.

Ignitable sparks that can occur when this voltage is disconnected are corresponding EN 50018 are flameproof and are then removed before they are actually removed cool down the plug-in module. Only then will the plug-in module become his Separation position removed and separated from the base part. In this way, the invention no additional arrangement of a switching device necessary, because of the removal of the plug-in module a voltage isolation of the corresponding system module should be done.

In a simple application example, control electronics and base part as well can be arranged in this plug-in module in a control cabinet. It is it goes without saying that a large number of such components are contained in the control cabinet could be. The corresponding system modules, such as sensors or the like, can be located far away from the control cabinet on site in the hazardous area and via appropriate connection lines, such as electrical wiring, Bus systems or the like with the control cabinet and accordingly with a base part and control electronics.

In order to be able to use a base part for more than one system module, the base part can have at least one support terminal for the serial connection of two system modules.

For attaching various electrical or electronic components, in particular in control cabinets, standardized rails are provided through which the components are held and to which the components can be easily attached. According to the base part have a base housing that can be snapped onto such a DIN rail, for example is. Other connections between the base part or base housing and Rail are obvious.

A snap fastening device can be used to easily implement such a snap connection be arranged on a rear side of the base housing.

An easily accessible and simply constructed base housing can be seen in it be that this is a trough-like lower part and a closing this, in particular has lockable base cover. For easier access to the Clamps can preferably be arranged directly in the base cover.

This is especially true for base housings that are attached to the DIN rails with the lower part The plug-in module can be easily plugged in, at least an insertion device can be arranged in the base cover, in which the plug-in module a mating device detachable and connecting system module and control electronics is insertable.

The insertion device can be constructed in a variety of ways. With a simple one For example, it can have a double socket, into which plug pins projecting outwards from the plug-in module can be inserted.

When using the system according to the invention in Ex areas, i.e. in areas with explosion risk, the plug connection between the plug-in module and the base part in the Type of protection "flameproof encapsulation" must be carried out, since no other types of protection Allow plugging under load in the Ex area, except in circuits of the type of protection "Intrinsically safe". Therefore, the double socket or the plug-in device is pressure-resistant encapsulated (EN 50018), such a connector can also be used if there is one explosive mixture in the area of the electrical system.

In order to connect and disconnect the To enable plug-in module, the base part can have a latching device with which the plug-in module is releasably locked in the connection and disconnection position and by which both positions are determined at the same time.

In one embodiment for such a latching device, it can have two on top of each other Assigning locking arms projecting outwards from the base cover with locking projections arranged on opposite outer sides of the plug-in module are plantable. It should be noted again that this type of locking device ensures that the system module is only switched off in the disconnected position and then remove the plug-in module from the disconnected position from the base part can.

A simple and inexpensive plug-in module can be realized in that this has a box-shaped plug-in housing that points away from the base part Front can be closed by a lid. In the plug-in module is the Securing in a manner known per se, for example between two resilient contacts held.

To plug-in module and base part in a simple manner to produce the plug connection to be able to assign the plug housing in its facing the base part Back have plug-in recesses in which the connector pins protrude and which can be plugged onto the sockets in the base part.

As already mentioned, the terminals can be used to connect the system module and Control electronics can be arranged directly in the base cover. To prevent the Terminals are accessible even before the plug-in module is removed, plug-in housings and / or base housing have terminal covers for the terminals. As a result, the terminals can only be reached after removing the terminal covers, which easily meets the requirements of accident prevention protection become. If such a clamp cover is connected to the plug housing, be the terminals are released by removing the plug-in module and are then accessible.

To easily establish an electrical connection between the terminals for the system module and control electronics within the base part can produce electrical Connection lines between the terminals and the plug-in device in the Base housing to be arranged.

Due to the compactness of the plug-in module and the base part, it is also possible to that at least one terminal cover is formed in one piece with the cover, so that at least some of the terminals are released directly when the plug-in module is removed become.

In a further embodiment of the invention, the insertion device can be used as be pressure-resistant capsule formed in the electrically connectable to the terminals Contact elements are arranged spaced from one another, an electrical Connection of the contact elements by a movable insert into the capsule Contact pin can be produced. An electrical connection to that contained in the plug-in module Fuse can be separately, for example, in the previously described Way. By correspondingly moving the contact pin as a switching device first the electrical connection between the system module and the control electronics interrupted and then the plug-in module can be separated from the base part.

In a simple embodiment, the contact pin can be removed from the plug-in module protrude. In this case, again by moving the plug-in module out of the Connection position in the disconnected position of the contact pin relative to the contact elements in the capsule so far that the electrical connection is disconnected. By subsequently removing the plug-in module from the disconnected position and completely Separation from the base part, the plug-in module can then be carried to a random Avoid reinserting into the connection position.

To move the contact pin before moving the plug-in module from the connection position to To move the separation position, the contact pin with a particular from the front of the plug-in housing or its cover, the actuating element projecting from the movement his. The contact pin is then so far over this actuator adjustable relative to the contact elements so that the electrical connection is separated becomes. Then, for example, the plug-in module can then be completely removed from the base part or at least in the above-mentioned separation position. It should be noted that the actuator, for example, an electrically insulating part of the Can be contact pin, which part at least partially protrudes from the plug-in module.

A simple design of contact elements which can be electrically connected to the contact pin arises, for example, when the contact elements from above one another the cap arranged contact rings are formed. In the voltage release position the contact pin is only in contact with one of these contact rings and in the voltage connection position it establishes contact between the two contact rings. These, in turn, are carried out in the same way as previously, with the terminals electrically connected for connecting the system module and control electronics.

In a further embodiment of the invention, the plug-in module can be a sleeve-shaped one Have lower part and a detachably attachable cap, the with the terminals electrically connected contact elements arranged in the lower part and at attached cap are connected via the fuse detachably held in the cap. In this case, the cap with the fuse is removed if the power is disconnected of the system module is desired. The lower part of the plug-in module with the ones arranged in it Contact elements can remain on the base part. The electrical contact to the plug-in module takes place, for example, in that the first contact element directly with a connection contact of the fuse and the second contact element via a mating contact element arranged within the cap with the other connection contact the fuse is connected.

A simple way of releasably attaching the cap to the lower part results from that these can be screwed together.

In order not to directly close the inside of the plug-in module when separating the cap and lower part open, the cap can be inserted into the lower part, open inner sleeve have, which at its lower end has an external thread for screwing with a has internal threads formed within the lower part. The cylindrical The gap between the inner sleeve and the lower part forms the gap for the pressure-resistant encapsulation.

To make the electrical connection while rotating the cap relative to the lower part To produce, the second contact element on an inside of the inner sleeve have adjacent sliding contact element.

To the electrical already after a partial twisting of the cap relative to the lower part Connection before removing the plug-in module or the cap to interrupt the base part, the mating contact element can be on the inside applied abrasive counter-contact element extending over part of the inner circumference and one of these to the other connection contact of the fuse extend connecting contact element. The electrical connection exists thereby as long as the sliding contact element and the sliding counter contact element are in contact are.

In this context, it is to be regarded as advantageous if the connection contact element in the area of the other connection contact of the fuse an elastic Plug-in holder forms. This is used to releasably hold one end of the fuse, which means that even when the cap is detached from the lower part, it is securely in the cap held and is manageable with this.

To connect to the first contact element when screwing the cap onto the lower part To manufacture safely, this can be spring loaded in the direction of securing his.

In a still further embodiment of the invention, the first contact element be arranged within the lower part in a pressure-resistant chamber from which a contact pin protrudes towards the fuse. It should be noted that the smaller the volume of the flameproof enclosure, the simpler the practical implementation. The circuit is therefore initially interrupted in this separate one flameproof chamber before further contact between the cap and base interrupted by their relative rotation to each other.

To separate the contact pin from the first contact element when unscrewing the cap and to be able to establish a secure connection to the fuse at the same time, the Contact pin movably mounted relative to the first contact element and towards the fuse be spring loaded. When unscrewing the cap is due to the spring action the contact pin is separated from the first contact element and device finally in contact with a wall of the chamber, whereupon by further unscrewing the cap also the contact between the contact pin and fuse is interrupted becomes.

In order to provide a terminal cover together with the cap in this exemplary embodiment to be able to handle, this can be rotatably supported on the cap. Thereby is a free rotation of the cap relative to the terminal cover to loosen the Cap from the lower part possible and after loosening the terminal cover can be put together be removed with the cap.

A simple rotatable mounting of the terminal cover on the cap is for example can be realized in that the terminal cover has an annular flange which at least partially inserted rotatably in an annular groove in the outer circumference of the cap is.

The plug-in module and base part according to the invention are compact and relatively small educated. However, it is still possible, if necessary, further electrical and / or electronic components, such as bus terminating resistor, voltage display, Current display, polarity indicator or the like in the plug-in module and / or in the base part to arrange.

In the following, advantageous embodiments of the invention are based on the in the Drawing accompanying figures explained and described in more detail.

Fig. 1

eine prinzipielle Darstellung einer zumindest Steuerelektronik, Steckmodul, Sockelteil und Anlagemodul umfassenden, erfindungsgemäßen elektrischen Anlage;

Fig. 2

eine elektrische Anlage, wie sie aus der Praxis bekannt ist;

Fig. 3

eine teilweise Darstellung analog zu Fig. 1 mit zwei Anlagemodulen;

Fig. 4

einen Schnitt entlang der Linie I-I aus Fig. 1 für ein erstes Ausführungsbeispiel von Steckmodul und Sockelteil;

Fig. 5

einen Schnitt analog zu Fig. 4 durch ein zweites Ausführungsbeispiel von Steckmodul und Sockelteil;

Fig. 6

einen Schnitt analog zu Fig. 4 durch ein drittes Ausführungsbeispiel von Steckmodul und Sockelteil; und

Fig. 7

einen Schnitt analog zu Fig. 4 durch ein viertes Ausführungsbeispiel von Steckmodul und Sockelteil.

Show it:

Fig. 1

a schematic diagram of an electrical system according to the invention comprising at least control electronics, plug-in module, base part and system module;

Fig. 2

an electrical system as is known from practice;

Fig. 3

a partial representation analogous to Figure 1 with two system modules.

Fig. 4

a section along the line II of Figure 1 for a first embodiment of plug-in module and base part.

Fig. 5

a section analogous to Figure 4 through a second embodiment of plug-in module and base part.

Fig. 6

a section analogous to Figure 4 through a third embodiment of plug-in module and base part. and

Fig. 7

a section analogous to FIG. 4 through a fourth embodiment of plug-in module and base part.

In Fig. 1 is a schematic representation of a system 1 according to the invention with at least a control electronics 2, a system module 3 and a plug-in module 9 with a base part 10, wherein the plug-in module and base part are simultaneously a switching device 5 form. The electrical system 1 can be similar to other of these components Have arrangement.

Control electronics 2 as well as plug-in module 9 and base part 10 are generally in one Control cabinet 13 arranged. The electrical connection between control electronics 2 and system module 3 takes place via electrical connecting lines 4, plug-in module and base part are arranged in the electrical connection line. The electrical Connection line 4 can be formed by individual cables, a bus system or the like his.

The base part 10 is detachably fastened within the control cabinet 13 and by this the plug-in module 9 with fuses 6 can be separated, see line 69 in FIG. 1. On the base part 10, first and second terminals 7, 8 are provided, on the system module 3 and control electronics 2 can be connected and are electrically connected when the plug-in module 9 is inserted.

Another clamp 14 is a so-called support clamp between each of the first and second terminals 7, 8 are provided, see FIG. 3.

At this point it should be noted that the electrical system 1 according to the invention in particular used in potentially explosive areas, so-called Ex areas is carried out with plug connections in the "flameproof enclosure" type of protection are.

2 shows an electrical system 1 according to the prior art. With this are in the electrical lines 4 between the control electronics 2 and system module 3 Arranged a number of different components. One component is a fuse box with two fuses 6. Another component is a switching device 5 for interrupting the electrical connection lines 4. Finally, inside the cabinet 13 also first and second terminals 7, 8 on the electrical connecting lines 4 provided, via which a voltage supply through further electrical lines takes place within the control cabinet 13.

In Fig. 3 the electrical system according to Fig. 1 is partially shown, by means of the first Terminals 7 and the support terminal 14 arranged in between two system modules 3, 15 are connected to the base part 10 via electrical lines. To this In this way, the system modules can be protected selectively and individually with parallel supply be disconnected from the voltage.

In Fig. 4 is a section along the line I-I of Fig. 1 through a first embodiment represented by plug-in module 9 and base part 10. As stated above, form Plug-in module and base part simultaneously a switching device 5 for interruption the power supply.

In Fig. 4 as in the following Figs. 5-7, the same parts are given the same reference numerals provided and are only partially mentioned in the following figures.

The base part 10 is by a base housing 16 made of tub-like lower part 20 and Base cover 21 formed. The lower part 20 has on its opposite the plug-in module 9 Back 19 a snap fastening device 18 for detachable fastening of the lower part 10 on a DIN rail 17.

The base cover 21 is detachably connected to the lower part 20 at the open end thereof and locked there. Known terminals 7, 8 are in the base cover 21 arranged. These are via electrical connecting lines 39 with contacts one Plug-in device 22 connected in the form of a double socket 24. In the insertion device 22 is a mating device 23 protruding from the plug-in module 9 detachably inserted. In this plug pins 25 are arranged, which from the plug-in module 9 in Project towards base part 10. Laterally spaced on both sides to the plug-in device 22 protrude from the base cover 21 locking arms 27, 28 as a locking device 26. These point towards one another and engage behind from outside 29, 30 of the plug-in module 9 protruding locking projections 31.

In the arrangement of the plug-in module 9 shown relative to the base part 10, this is Plug module 9 arranged in its connecting position 11. In this the on behind the base cover 21 spaced-apart locking projections 31 behind.

The plug-in module 9 is formed by a box-shaped plug housing 32 with a cover 34. In a rear side of the plug housing 32 facing the base cover 21 in the plug-in recesses 36, the mating plug-in devices 23 with the plug pins 25 arranged. These engage with the plug-in device 22 when in the connecting position 11 arranged plug-in module 9.

The cover 34 of the plug-in module 9 has a one-piece terminal cover 38 on one side to which extends in steps over the locking arm 28 and the second terminals 8 and covers them. A second terminal cover 37 covers the first terminals 7 opposite the plug-in module 9, both terminal covers 37, 38 can be formed in one piece with the plug-in module 9.

The locking projections 31 protrude from outer sides 29, 30 of the plug housing 32.

For the use of plug-in module 9 and base part 10 in Ex areas, the are Plug-in device 22 in plug-in device 23 formed plug connections in the type of protection "flameproof enclosure". Allow other types of protection No plugging in the Ex area, except in circuits of the "intrinsic safety" type of protection.

The fuse (s) are detachably held within the plug-in module 9 and via electrical Lines connected to the connector pins 25.

5 is a section analogous to FIG. 4 through a second embodiment of FIG Plug module 9 and base part 10 shown.

In contrast to FIG. 4, the plug-in module 9 is also shown in broken lines in FIG. 5 in the disconnected position 12 shown. In this position, the locking arms 27, 28 engage behind them to the base cover 21 arranged locking projections 31. In such a separation position 4 is so far separated from the base part 10 that the electrical Connection between the plug-in device 22 and the counter-plug-in device 23 is interrupted is. In this state the flameproof enclosure is still preserved, however also in FIG. 4.

The embodiment of FIG. 5 also differs from the embodiment 4 in that the electrical connections between fuse 6 and first and second terminals 7, 8 are only shown in principle, these being analogous to Fig. 4 can be executed. However, these connections can be made in other easily separable form can be realized.

In the exemplary embodiment according to FIG. 5, an in particular pressure-resistant is in the base part 10 Capsule 40 arranged, which is fixed in the base cover 21. Inside the capsule 40 are contact rings spaced apart from one another in the longitudinal direction of a contact pin 42 44 arranged as contact elements 41. A lower one of these contact rings 44 is over a electrical connecting line 39 with one end of the fuse 6 in the plug-in module 9 connected. The other end of the fuse is connected to the first terminal 7. The upper contact ring 44 is connected via a further electrical connecting line 39 to the second terminal 8 connected.

The contact pin 42 is inserted into the capsule 40 from the direction of the plug-in module 9. This is slidably mounted in the plug-in module 9. The plug-in recess serves for storage 36 of the plug housing 32 and an opening in the cover 34 of the plug-in module 9. The contact pin 42 has an actuating member 43 at its upper end is made of an electrically insulating material. By means of this actuator 43 is the contact pin 42 in the direction 66 relative to the plug-in module 9 in the connecting position 11 movable. The actuator 43 also has an annular shoulder 70 to which the movement of the contact pin 42 relative to the plug-in module 9 in the direction of movement 66 limited by abutment on the cover 34. For electrical insulation of the Actuator 43 can this above a mark 69 from an electrical insulating material formed or in the area of the marking 69 electrically from the rest Contact pin 42 to be separated.

5, the contact pin 42 forms an electrical one Connection between the spaced-apart contact rings 44, so that the Circuit between first and second terminals 7, 8 closed via fuse 6 is. When the annular shoulder 70 is in contact with the cover 34 from below or with the plug-in module 9 in the broken position 12 shown in broken lines, the contact pin 42 is only in contact with a contact ring 44, i.e. the upper directly adjacent to the base cover 21 Contact ring. This is the electrical circuit between the first and second terminal 7, 8 interrupted.

Such a break in the electrical circuit before it is actually removed of the plug-in module 9 is important for Ex areas, since sparks that occur when the Circuit can occur, cool down before opening or removing the plug-in module 9 have to.

6 is a section analogous to FIG. 4 through a third embodiment of FIG Plug module 9 and base part 10 shown.

In this case, the plug-in module 9 comprises a cap 46 and a lower part 45. The lower part 45 is arranged on the base cover 21 and is detachably fastened there, for example. The cap 46 is detachably connected to the lower part 45 by screwing. The cap 46 has a cylindrical inner sleeve 51 which can be inserted into the lower part 45. This has at its lower end 52 an external thread 53, the one on an inside of the lower part 45 arranged internal thread 54 can be screwed.

Within the cap 46, the fuse 6 is substantially in the longitudinal direction of the inner sleeve 51 arranged. A lower connection contact 48 of the fuse 6 is connected to a first one Contact element 47 in the system. This is by a spring 58 in the direction of the terminal contact 48 of the fuse 6 spring-loaded. Form cap 46 and lower part 45 thereby a pressure-resistant encapsulation.

The other connection contact 50 of the fuse 6 is in a resilient connection contact element 58 releasably held. The connection contact element 58 is part a mating contact element 56, the second at the lower end 52 of the cap 46 Contacted contact element 49 in the form of a sliding contact element 55. First and second contact elements 47, 49 are via corresponding electrical connecting lines 39 connected to first and second terminals 7, 8.

In the area of the sliding contact element 55, the mating contact element 56 is marked by a Grinding mating contact element 59 is formed, which extends over only part of the circumference an inside 57 of the capsule 46 extends. When rotating the cap 46 relative to Lower part 45 slide sliding counter-contact element 59 and sliding contact element 55 against one another along until an area of the inside 57 of the cap 46 is reached on which no grinding mating contact element 59 is applied. The electrical is separated there Connection between first and second terminals 7, 8. After the cap 46 is rotated so far relative to the lower part 45 that the electrical connection is interrupted (disconnected position), the cap 46 can be rotated if necessary can be loosened relative to the lower part and removed from the base part 10.

An annular groove 63 is formed in an outer circumference 64 of the cap 46, see also Fig. 7, at least partially engages an annular flange 42. This is in one piece with the Terminal cover 38 connected to cover the second terminals 8. When removing the cap 46 from the base part 10, this terminal cover 38 can also be removed and at least the second terminals 8 are accessible.

It should be noted that the terminal cover 37 is also integral with the terminal cover 38 can be formed. In an alternative embodiment, the Terminal cover 37 can be removed separately from base part 10.

The mating contact element 56 can extend into the area of the external thread 53 Be guided around outside of the inner sleeve 51.

FIG. 7 shows a fourth exemplary embodiment in a representation analogous to the section according to FIGS. 4 to 6 represented by plug-in module 9 and base part 10.

This differs in particular from the exemplary embodiment according to FIG. 6 in that that on a bottom of the lower part 45 opposite the base cover 21 one pressure-resistant chamber 60 is formed. In this is the first contact element 47 and a contact pin 61 protruding from the chamber 60 in the direction of the fuse 6. The contact pin 61 contacts the lower connection contact 48 of the fuse 6. The contact pin 61 is at its end opposite the fuse 6 with the first contact element 47 in electrical contact. When the cap 46 is rotated relatively to the lower part 45, the cap 46 moves away from the lower part 45. The contact pin follows in part 61 this movement of the cap 46 or the fuse 6, since the contact pin 61 acted on its enlarged underside by a spring 68 in the direction of fuse 6 is. After electrical separation of contact pin 61 and the first contact element 47 the circuit between first and second terminals 7, 8 is interrupted, whereupon the cap 46 can be completely unscrewed and removed from the base part 10.

In the embodiment of FIG. 7 is also different from that of FIG. 6 note that the chamber 60 is a compared to the interior of the cap 46 has a smaller volume. Such a smaller volume simplifies the practical one Execution of the so-called "pressure-resistant encapsulation".

The fuses 6 are preferably standardized, commercially available fuses. Farther it should be noted that both in the plug-in module 9 and in the base part 10 or at least arranged in one of the two additional electrical and / or electronic components can be, such as bus terminating resistors, voltage indicators, current indicators, Polarity indicators or the like. Even with such additional electrical or electronic components, the unit consisting of plug-in module / base part is very compact and in particular the plug-in module can be easily carried out by maintenance personnel or the like to protect against unintentional restart of the interrupted Circuit are carried. In addition, the first and second terminals 7, 8 can only be reached by using the terminal covers 37, 38 if at least the plug-in module 9 is removed. This easily meets the requirements of accident prevention protection and is particularly important if that to be exchanged or system module to be maintained, such as a sensor or the like, itself is located far from the control cabinet 13 or the base part 10.

In all embodiments of the invention it is at least ensured that the Circuit between first and second terminals interrupted and only then Plug-in module with fuse 6 can be removed. Sparks that occur when the Circuit can occur in this way before opening the corresponding one Pressure-resistant encapsulation cooled, as is necessary for Ex areas.

Claims (34)

Electrical system (1) with at least one control electronics (2) and a system module (3) that can be connected to it, with at least one switching device (5) and a fuse (3) in an electrical connecting line (4) between the control electronics (2) and the system module (3) 6) and terminals (7, 8) for connecting the system module (3) to the electrical connecting line (4), characterized in that the fuse (6) is contained in a plug-in module (9) which is inserted into a base part (10 ) is detachably inserted, which has first terminals (7) for connecting the system module (3) and second terminals (8) for connecting the control electronics (2), an electrical connection between the first and second terminals (7, 8) being inserted Plug-in module (9) is formed. Electrical system according to Claim 1, characterized in that the plug-in module (9) can be arranged as a switching device (5) in at least two positions (11, 12) relative to the base part (10), with the system module (3) in the first connection position (11) and control electronics (2) are electrically connected and are electrically separated from one another in the second disconnected position (12). Electrical system according to claim 1 or 2, characterized in that control electronics (2) and base part (10) and plug-in module (9) are arranged in a control cabinet (13). Electrical system according to at least one of the preceding claims, characterized in that the base part (10) has at least one support clamp (14) for the parallel connection of two system modules (3). Electrical system according to at least one of the preceding claims, characterized in that the base part (10) has a base housing (16) which can be snapped onto a DIN rail (17). Electrical system according to at least one of the preceding claims, characterized in that a snap fastening device (18) is arranged on a rear side (19) of the base housing (16). Electrical system according to at least one of the preceding claims, characterized in that the base housing (16) has a trough-like lower part (20) and a base cover (21) which closes it and in particular can be locked, the terminals (7, 8) in the base cover (21) are arranged. Electrical system according to at least one of the preceding claims, characterized in that at least one plug-in device (22) is arranged in the base cover (21), into which the plug-in module (9) with a mating plug-in device (23) can be detached and the plant module (3) and control electronics (2 ) can be inserted in an electrically connecting manner. Electrical system according to at least one of the preceding claims, characterized in that the plug-in device (22) has a double plug socket (24) into which plug pins (25) projecting outwards from the plug module (9) can be inserted. Electrical system according to at least one of the preceding claims, characterized in that the double plug socket (24) is encapsulated in a pressure-resistant manner. Electrical system according to at least one of the preceding claims, characterized in that the base part (10) has a latching device (26) with which the plug-in module (9) is releasably latched in the connecting and disconnected position (11, 12). Electrical system according to at least one of the preceding claims, characterized in that the latching device (26) has two latching arms (27, 28) which face one another and project outwardly from the base cover (21) and which are on opposite outer sides (29, 30) of the plug-in module (9) arranged locking projections (31) can be brought into contact. Electrical system according to at least one of the preceding claims, characterized in that the plug-in module (9) has a box-shaped plug-in housing (32) which can be closed by a cover (34) on its front side (33) pointing away from the base part (10). Electrical system according to at least one of the preceding claims, characterized in that the plug housing (32) has, in its rear side (35) facing the base part (10), a plug recess (36) in which the plug pins (25) protrude in the mating plug device and which protrude the sockets (24) can be plugged on. Electrical system according to at least one of the preceding claims, characterized in that the plug housing (32) and / or base housing (16) have terminal covers (37, 38) for the terminals (7, 8). Electrical system according to at least one of the preceding claims, characterized in that electrical connecting lines (39) are arranged between terminals (7, 8) and plug-in devices (22) in the base housing (16). Electrical system according to at least one of the preceding claims, characterized in that at least one terminal cover (37) is formed in one piece with the plug-in module (9), in particular the cover (34). Electrical system according to at least one of the preceding claims, characterized in that the plug-in device (22) is designed as a pressure-resistant capsule (40) in which contact elements (41) electrically connected to the terminals (7, 8) are arranged at a distance from one another, one electrical connection of the contact elements (41) can be established by means of a contact pin (42) which can be moved in the capsule (40). Electrical system according to at least one of the preceding claims, characterized in that the contact pin (42) protrudes from the plug-in module (9). Electrical system according to at least one of the preceding claims , characterized in that the contact pin (42) is motionally connected to an actuating member (43) which projects in particular from the front (33) of the plug housing (32) or its cover (34). Electrical system according to at least one of the preceding claims, characterized in that the contact elements (41) are formed from contact rings (44) arranged one above the other in the capsule (40). Electrical system according to at least one of the preceding claims, characterized in that the plug-in module (9) has a sleeve-shaped lower part (45) and a cap (46) which can be releasably placed thereon, the contact elements (11) which are electrically connected to the terminals (7, 8). 41) are arranged in the lower part (45) and, when the cap (46) is attached, are connected via the fuse (6) detachably held in the cap. Electrical system according to at least one of the preceding claims, characterized in that a first contact element (47) directly with a connection contact (48) of the fuse (6) and the second contact element (49) via a contact element (55) arranged inside the cap (46) , 56) with the other connection contact (50) of the fuse (6). Electrical system according to at least one of the preceding claims, characterized in that the cap (46) can be screwed to the lower part (45). Electrical system according to at least one of the preceding claims, characterized in that the cap (46) has an inner sleeve (51) which can be inserted into the lower part (45) and is open at the bottom and which has an external thread (53) at its lower end (52) Has screwing with an internal thread (54) formed within the lower part (45). Electrical system according to at least one of the preceding claims, characterized in that the second contact element (49) is designed as a sliding contact element (55) abutting an inner side (57) of the inner sleeve (51). Electrical system according to at least one of the preceding claims, characterized in that the counter-contact element (56) has an abrasive counter-contact element (59) applied to the inside (57) and extends over part of the inner circumference and a connection contact (50) extending from the latter to the other. the fuse (6) extends connecting contact element (58). Electrical system according to at least one of the preceding claims, characterized in that the connection contact element (58) forms an elastic plug-in receptacle in the region of the other connection contact (50) of the fuse (6). Electrical system according to at least one of the preceding claims, characterized in that the first contact element (47) is spring-loaded in the direction of the fuse (6). Electrical system according to at least one of the preceding claims, characterized in that the first contact element (47) is arranged within the lower part (45) in a pressure-resistant chamber (60) from which a contact pin (61) projects in the direction of the fuse (6). Electrical system according to at least one of the preceding claims, characterized in that the contact pin (61) is movably mounted relative to the first contact element (47) and is spring-loaded in the direction of the fuse (6). Electrical system according to at least one of the preceding claims, characterized in that the terminal cover (37) is rotatably supported on the cap (46). Electrical system according to at least one of the preceding claims, characterized in that the terminal cover (37) has an annular flange (62) which is at least partially rotatably inserted in an annular groove (63) in the outer circumference (64) of the cap (46). Electrical system according to at least one of the preceding claims, characterized in that further electrical and / or electronic components, such as a bus terminating resistor, a voltage display, a current display, a polarity indicator or the like, are arranged in the plug-in module (9) and / or in the base part (10) are.

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