DE19858688C1 - Electrical switchgear with plug-in switching devices has insertion aid for latter installed in switchgear reception frame - Google Patents

Abstract

The electrical switchgear has a frame (1) with at least one reception compartment (2) for a plug-in switching device (3) provided with electrical contacts (5) brought into engagement with counter-contacts (6) provided by the frame, upon movement of the plug-in switching device via an insertion aid (10) installed in the frame. The plug-in switching device is coupled to the insertion aid via a coupling rod (14) and a pivot lever (12).

Description

The present invention relates to an electrical switchgear with little at least one that can be inserted into a slot in a frame, in particular dere switchgear-carrying device insert, which with electrical con clocking is provided with the electrical counter held in the frame contacts can be brought into engagement with one in the frame the mechanical slide-in aid, through which the device slide-in from a disconnected position in which the electrical contacts of the counter con clocks are separated, in an operating position in which the electrical Contacts with the mating contacts are engaged, is displaceable, wherein the slide-in aid permanently installed in the frame and for feeding the Ge connect the slide-in units with it after inserting it into the frame is cash.

Switchgear of this type is used in particular where Switching, protection, separation, distribution and / or control functions to be fulfilled are. To establish contact between the devices of an On pushes and busbars held in the frame, connecting contacts or the like, the entire slot is toward the collector rails or connecting contacts moved to thereby the required Chen electrical connections. Problematic with this Insert technology is that for contacting the entire, usually right  relatively heavy insert must be moved. In addition, always a relatively high level of security can be guaranteed.

By arranging the slide-in aid as part of the electrical The corresponding installation space is saved in the slide-in compartment. This means that the slot is fully accessible from the device slot Available. Furthermore, no measures have to be taken on the slide-in aid be provided to this after insertion into the slot on Support frame. Rather, the insertion aid with the frame of firmly connected from the start. This configuration of the electrical Switchgear is also easier to seal.

A switchgear of the type mentioned is from DE-OS 14 65 889 known. With this switchgear, the device insert is replaced by a simple spindle actuated. Also from ATE 10 244 and US 4,743,715 Switchgear are known in which the device insert by spin deln is operated.

EP 0 228 987 B1 describes a switchgear assembly with a crossbar knows. Coupling linkage and similar devices for retracting a device insert show the documents DE 197 49 850 A1 and DE 296 01 101 U1. An earthing connected to a cable outlet door switch is known from DE 196 32 636 C2. Finally pressure shows document DE 36 21 748 A1 sliding contacts.

The invention has for its object such an electrical To improve switchgear so that it takes up little space and the is easy and safe to use.  

This object is achieved in that the device insert for insertion and Extend via a coupling rod and a swivel lever with the on pushing aid can be coupled, viewed in the direction of insertion front area of the frame is arranged, the pivot lever on the slide-in aid and the coupling rod with one end on Swivel levers are mounted, with the other end of the coupling rod can be brought into engagement with the device insert and where closing Lich the swivel lever for moving the device insert into the loading drive position at least until a stretched position of the Swivel lever and the coupling rod, in the direction of insertion are aligned with each other, and preferably until one is reached Dead center position is pivotable to support the device insert and keep in the operating position.

After the pivot lever and the coupling rod by a correspond appropriate pivoting of the pivot lever in their extension or overdead point position, it is ensured that the device insert reliably supported and even then held in the operating position becomes, for example, due to a short circuit in the pull-out tion is applied. Because of this stretch position or over-dead center position in particular there is also an optimal distribution of forces. The actuator The force of contact is at most slightly increased by the contact forces, which especially when using an electric motor drive from Advantage is.

According to one embodiment of the invention, the insertion aid is below of the slot in the frame, especially in the area  a crossbar. The slide-in aid can thus easily with the Device rack can be brought into engagement without this essential would have to be rebuilt. In particular, it is possible to to arrange thrust on a trolley on which the insertion aid takes hold.  

According to a further embodiment of the invention, the coupling rod by means of a protruding pin with an associated receptacle of the Device slots can be brought into engagement. The inclusion is preferred as an inside angled slot in a crossbar of the device insert or a trolley carrying this, whose mouth in Direction of insertion points, the insertion aid a guide for has the coupling pin, which is designed such that the pin in the Starting position of the slide-in aid can be extended and retracted into the holder and when operating the slide-in aid with the angled down cut of the slot comes into engagement.

The coupling of the slide-in aid is thus easily and safely solved. At the device insert or a carriage carrying this is only to provide an angled slot. The scenery guide ensures safe insertion of the pin into the slot in the basic position like reaching behind the angled section of the slot Take the device slot with you. The scenery also takes on Retracting forces occurring transversely to the direction of insertion. This bela Therefore, do not insert the device, so that a symmetrical entry the plug-in unit is guaranteed.

The link guide is preferably part of a housing which the Kop fur rod down supported. This ensures that the scenery control = immediately the coupling rod against falling.

According to a further embodiment of the invention, the insert comprises help a manually and / or electro associated with the swivel lever motor-operated drive. Manual drive is preferred  Can be operated from the front of the slide-in aid, the frame has a plate in front of the insertion aid, which has a first Locking plate lockable access opening to the manual on drive is provided. This can activate the manual drive simply done from the front. Through the closure plate can Incorrect operation can be prevented. For this, the closure plate is in particular in particular by a restoring force in the access opening to the drive closing position charged.

According to a further embodiment of the invention, at least one part the safety devices assigned to the device insert in the frame men, especially in the area of the insertion aid, arranged. With that ent if these safety devices are arranged on the plug-in unit, whereby the manufacturing effort is further reduced. The correspond the safety devices can be pre-assembled.

According to a further embodiment of the invention, a socket for egg NEN power supply and control connector provided, a Verrie gelungseinrichtung is provided, by pulling out the Stec kers is prevented as long as the slide-in aid is operated and the Insertion aid blocked as long as the plug is not inserted.

It is preferred to block the connector via the position of the first Locking plate controlled, which in turn only when the plug is inserted their release position of the spindle access is displaceable. This will incorrect operation is easily excluded.  

The first version raises and lowers as a particularly simple and safe solution end plate over a sliding block a rod through which the Plug is blocked or released and that only when plug ker can be raised.

Furthermore, the socket is preferred for receiving a commercially available Chen plug, with a receptacle for the Plug is provided between a first and a second position is movable and pulling the plug in the first position blocked and allows the rod to be raised in the second position released against the plug and blocked the rod against lifting. In order to can be a commercially available plug for the Device drawer can be used, increasing manufacturing costs further be lowered.

According to a further embodiment of the invention, a Switching device, for example a circuit breaker is provided, which is electrically switchable, the switching device when the slide-in aid is actuated is secured against being switched on and the slide-in aid is turned on switched switching device is blocked. This will also result in incorrect operation prevented.

In particular, the first closure plate drives when the door is released a thrust rod mounted in the frame, the one Switch actuated, which un the inrush circuit of the switching device interrupts, the push rod blocking when the switching device is switched on is. It is particularly preferred if on the switch-on shaft Switching device is a cam through which the  Push rod is blocked when the switching device is switched on, and the one Has recess in which the raised push rod in Ru position of the switch-on shaft can be snapped into place. These configurations are both reliable and inexpensive.

According to a further embodiment of the invention is an Er earthing switch provided, the earthing switch when activated slide-in aid is blocked against actuation and the slide-in aid is blocked when the earthing switch is actuated. Through this configuration further incorrect operations are prevented.

In particular, the earthing switch is connected in parallel to the on mechanically drivable shaft can be actuated, where the first locking plate is extended to the earth shaft and this in their open position with a corresponding to the wave cross section includes semicircular cut end portion and thereby ei NEN intervention of an operating tool for the earth shaft prevented. This solution is also simple and reliable.

According to a further embodiment of the invention, a second Ver end plate provided for access to the manual drive, which over the rotation of the earth shaft can be actuated and the earth in the earth position derwelle closes the access but releases it in the basic position. Here by activating the slide-in aid and thus retracting of the device insert when the earthing switch is activated is prevented.

According to a further embodiment of the invention, the slot is Lockable via a door, the slot door when retracted  Nem plug-in is blocked against opening and the Device insert with the device insert door open against insertion is blocked. This prevents further operating errors.

In particular, a spring is provided in its closed position pre-tensioned locking plate for access to the manual drive hen which is moved into its release position by closing the door. Again, this is simple and reliable.

For emergency actuation, access is also advantageous a suitable tool is provided. This opens the door Emergencies possible even when the device insert is not for approval the slide-in compartment door is extendable.

According to a further embodiment of the invention is a door lockable cable connection space provided, especially below of the slide-in compartment, the cable connection compartment door not being actuated earthing switch is blocked against opening. This guarantees Continues that access to the cable connection compartment is only possible when the Er is activated switch is possible.

In particular, a rail movable over the earth shaft is provided with a Locking section provided, the cable when the earth shaft is actuated Locking door locked and with earth shaft in basic position releases them. Again, this is simple and reliable.

According to a further embodiment of the invention, the locking section against a spring force relative to the rail in a release position ver  pivotable and accessible to a tool for emergency operation. There This ensures that the cable connection door in emergencies can also be opened when the earthing switch is actuated not possible.

According to a further embodiment of the invention is for the earth shaft and / or access to the manual drive additionally an electric actuable locking magnet provided. This configuration enables advantageously remote control of the blocking devices.

An embodiment of the invention is shown in the drawing and is described below. It shows, each in a schematic Presentation,

Fig. 1 position is a vertical section through an inventive switchgear,

Fig. 2 is a horizontal sectional view of the switchgear shown in Fig. 1 at the level of the insertion aid from at driven position of the insertion aid,

Shows a representation according to FIG. 2 aid. 3 at the retracted slide,

Fig. 4 is a partial front view of the switch of the invention,

Fig. 5 is a partial horizontal section through an inventive switchgear,

Fig. 6 is a partial vertical section through a switching system according to the invention and

Fig. 7 shows another partial vertical section through an inventive switchgear.

Fig. 1 shows a frame 1 forming a housing of a switchgear according to the invention with a slide-in compartment 2 , a device slide-in unit 3 , which is mounted on a trolley 4 and can be moved into and out of the slide-in compartment 2 . The device insert 3 comprises electrical contacts 5 , which are contacted in their inserted position with counter contacts 6 in the frame 1 .

Below the slot 2 , a cable connection space 7 is net angeord. This can be closed by a door 8 . The slot 2 can be closed by a door 9 . Between the insertion compartment 2 and the cable connection space 7 , an insertion aid 10 is arranged in the frame 1 , via which the device insert 4 can be moved in and out of the insertion compartment 2 . For this purpose, the insertion aid 10 engages with a pin 11 standing upwards on the carriage 4 , on which the device insert 3 is mounted.

The individual components of the insertion aid 10 can be seen in FIGS. 2 and 3. The insertion aid comprises a swivel lever 12 which can be swiveled by approximately 90 ° via an associated spindle drive 13 . On the pivot lever 12 , one end of a coupling rod 14 is hinged, the other end of which carries the pin 11 .

The pin 11 is guided in a link guide 15 which is provided in the upper wall of a housing 16 , the lower wall of which supports the coupling rod 14 downwards. The link guide 15 is arranged approximately in the transverse median plane of the insertion aid 10 and extends essentially in the insertion direction I. At its end facing the front of the frame 1 , the link guide 15 is, however, angled obliquely towards the front.

On the trolley 4 , a crossbar 17 is provided, which is provided with a slot 18 which on the front of the frame 1 abge facing side of the crossbar 17 sets laterally to the slide guide 15 opens and is angled towards the slide guide 15 . The mouth 19 of the slot 18 is aligned with the pin 11 when it is in its the front of the frame 1 next position. In contrast, the angled portion 20 of the slot 18 is aligned with the extending in the insertion direction I from the link guide 15th

The spindle drive 13 comprises an extending in the insertion direction I de spindle 21 , which is formed on its side facing the front of the frame 1 as a polygon in order to be able to actuate the spindle mechanically. At the other end of the spindle 21 , an electric motor drive can attack. On the spindle 21 sits a spindle nut 22 which is coupled to the pivot lever 12 so that the pivot lever 12 pivots when loading the spindle 21 and the coupling rod 14 moves to the rear side of the frame 1 . The pivot axis II of the pivot lever 12 and the pivot axis III of the coupling rod 14 each run perpendicular to the insertion direction 1 and in particular vertically.

The front of the insertion aid 10 is covered by a plate 23 in which an access opening 24 to the spindle 21 is provided. Behind the plate 23 a parallel first closure plate 25 is provided, which also has an opening 26 and between an opening position, in which the two openings 24 and 26 are aligned and a closed position in which the two openings 24 and 26 are offset against each other , is movable. The first closure plate 25 is biased into its closed position by a restoring force. See also Fig. 4 here.

In Figs. 4 and 5 further comprising a earth shaft 27 is shown through which a not shown here earthing switch is actuated. For this purpose, the earth shaft 27 extending in the insertion direction I is designed to be rotatable about its longitudinal axis IV. The first closure plate 25 is extended at one end to the earth shaft 27 . It has an end portion 28 in the form of a circular arc, the cross section of which corresponds to the cross section of the earth shaft 27 . When moving the first United closure plate 25 in its open position, so in Fig. 4 to the left, the end portion 28 slides over the end of the earth shaft 27 , which is designed to engage an actuating tool. In the opening position of the first closure plate 25 , the engagement of a tool on the earth shaft 27 for actuating the earthing switch is prevented. Accordingly, when the actuating tool is placed on the earth shaft 27, the first closure plate 25 is prevented from moving into its open position. Thus, when the insertion aid 10 is actuated via the spindle drive 13, the earthing switch cannot be actuated and when the earthing switch is actuated, the spindle drive 13 and since the insertion aid 10 cannot be actuated.

As shown in Fig. 5, a second closure plate 29 is provided which extends parallel to the first closure plate 25 and is displaced by the rotation of the earth shaft 27 . The second closure plate 29 has a through opening 30 which is aligned only when the earth shaft 27 is not rotated with the access opening in the plate 23 . This prevents actuation of the insertion aid 10 when the earthing is switched on.

As shown in FIG. 4, the first closure plate 25 is also provided with a bevel 31 at its second end facing away from the end section 28 . The bevel 31 is used to engage a cranked section from the slot door 9 such that the first closure plate 25 is moved against the force of a return spring in its shown in Fig. 4 from the lowered position. In the absence of engagement with the bevel 31 , the first locking plate 25 is moved into a raised position in which it blocks the access opening 24 to the spindle 21 . In this way, actuation of the slide-in aid 10 is prevented when a drawer door 9 is open.

As shown in Fig. 7, the slot door 9 is ausgebil det as a lift door, which can only be opened in the raised position. A Riegelab section 32 of the first lock plate 25 (see FIG. 4) is in engagement with a drawer door 9 when the lock plate 25 is in the open position so that the drawer door 9 cannot be raised and thus cannot be opened. This ensures that when the slide-in aid 10 is actuated, the slide-in compartment door 9 cannot be opened. For an emergency actuation, the locking portion 32 can be brought against the force of a return spring out of engagement with the door and accessible from the outside for a tool.

As shown in Fig. 1, the cable connection compartment door 8 is also designed as a lifting door, which can only be opened in the raised position. On a rail 33 (see Fig. 5), which is displaceable when the earth shaft 27 is rotated, a locking section 34 is arranged which in the basic position of the earth shaft 27 with the cable connection chamber door 8 engages in such a way that it cannot be raised. This prevents the cable connection door 8 from being opened when the earthing switch is not actuated. The locking portion 34 is brought over the rail 33 is disengaged from the cable compartment door 8, so that it can be ge opens by turning the earth shaft 27 in their operating position of the earthing switch. For an emergency actuation, the locking portion 34 can be brought against the force of a return spring even in the basic position of the earth shaft 27 out of engagement with the cable connection space door 8 and accessible from the outside for a tool.

Fig. 6 shows a fuse device for a Lei circuit breaker, not shown. The circuit breaker is actuated by rotating an electrically driven shaft 35 . On the shaft 35 , a cam disc 36 is arranged against which a push rod 37 which is raised in the frame 1 is supported. The cam 36 is so formed that the push rod 37 cannot be raised when the circuit breaker is switched on. In the switched-off circuit breaker, however, the push rod 37 is raised and can engage in such a way that a rotation of the cam 36 is prevented by its bearing against the cam plate 36 end 38 in a recess 39 of the cam 36th

At the other end of the push rod 37 there is a wheel 40 which rolls on a control plate 41 . The control plate 41 is moved over the first closure plate 25 such that the push rod 37 is raised in the opening position of the first closure plate 25 and the cam disc 36 is blocked against rotation. When the cam plate 36 is rotated, on the other hand, the first locking plate 25 cannot be moved into its opening position, since the push rod 37 cannot be raised and the control plate 41 is therefore not displaceable. The raised push rod 37 actuates a switch 43 which interrupts the actuating circuit for the shaft 35 . This prevents switching on of the circuit breaker and when the Lei-breakers operation of the insertion aid 10 upon actuation of the insertion aid 10 degrees.

As can be seen, the illustrated and described electrical switchgear is characterized by a simple and inexpensive construction. Advantageously, the slide-in aid 10 does not take up any space in the slot 2 , which can therefore be used completely for the device slot 3 . The safety devices are largely housed in the frame 1 of the switchgear, so that they can advantageously be installed in fixed. The switchgear according to the invention is also advantageous in handling. It is also easy to seal.

Reference list

1

frame

2nd

Slot

3rd

Device rack

4th

Trolley

5

electric contact

6

Counter contact

7

Cable connection room

8th

Cable connection room door

9

Slot door

10th

Insertion aid

11

pen

12th

Swivel lever

13

Spindle drive

14

Coupling rod

15

Scenery tour

16

casing

17th

Crossbar

18th

slot

19th

Mouth of

18th

20th

Section of

18th

21

spindle

22

Spindle nut

23

plate

24th

Access opening to

21

25th

first locking plate

26

Opening in

25th

27

Earth wave

28

End section of

25th

29

second locking plate

30th

Opening in

29

31

Weird

32

Bolt section

33

rail

34

Bolt section

35

wave

36

Cam

37

Push rod

38

End of

37

39

Recess in

36

40

wheel

41

Control plate

42

ramp

43

switch
I direction of insertion
II swivel axis of

12th

III swivel axis of

14

IV axis of rotation of

27

Claims (27)

1. Electrical switchgear with at least one in a slot ( 2 ) of a frame ( 1 ) can be used, in particular switchgear-carrying device insert ( 3 ), which is seen with electrical contacts ( 5 ) ver, with the frame ( 1 ) held electrical counter contacts ( 6 ) can be brought into engagement with a mechanical insertion aid ( 10 ) which is supported in the frame ( 1 ) and through which the device insert ( 3 ) is separated from a disconnected position in which the electrical contacts ( 5 ) are separated from the mating contacts ( 6 ) are, in an operating position in which the electrical contacts ( 5 ) are engaged with the counter contacts ( 6 ), can be moved, the insertion aid ( 10 ) being permanently installed in the frame ( 1 ) and for feeding the device insert ( 3 ) can be coupled with this after its insertion into the frame ( 1 ), characterized in that the device insert ( 3 ) for retracting and extending via a coupling rod ( 14 ) and a pivoting lever ( 12 ) mi t of the insertion aid ( 10 ) can be coupled, which is arranged in a direction of insertion (I) viewed in the front area of the frame ( 1 ), that the pivoting lever ( 12 ) on the insertion aid ( 10 ) and the coupling rod ( 14 ) with one End on the pivot lever ( 12 ) are mounted that the other end of the coupling rod ( 14 ) with the device insert ( 3 ) can be brought into a handle, and that the pivot lever ( 12 ) for moving the device insert ( 3 ) into the operating position at least until to reach a stretched position of the pivot lever ( 12 ) and the coupling rod ( 14 ), in which they are aligned with each other in the insertion direction (I), and preferably pivotable until reaching an overdead position in order to support the device insert ( 3 ) and to keep in the operating position. 2. Electrical switchgear according to claim 1, characterized in that the insertion aid ( 10 ) below the slot ( 2 ) is arranged in the frame ( 1 ). 3. Electrical switchgear according to claim 2, characterized in that the insertion aid ( 10 ) is arranged in the region of a crossbar of the frame ( 1 ). 4. Electrical switchgear according to one of the preceding Ansprü surface, characterized in that the coupling rod ( 14 ) by means of a projecting pin ( 11 ) with an associated receptacle ( 18 ) of the device insert ( 3 ) can be brought into a handle. 5. Electrical switchgear according to claim 4, characterized in that the receptacle as an inside angled slot ( 18 ) in a crossmember ( 17 ) of the plug-in module ( 3 ) or one of these carries the trolley ( 4 ), the mouth ( 19 ) is formed in having a thrust direction (I) has, and that the insertion aid (10) mustard EADERSHIP a pencils (15) for the coupling pin (11) which is designed such that the pin (11) thrust-aid (10) in which in the starting position of a Recording ( 18 ) is retractable and extendable and when driving the insertion aid ( 10 ) with the angled section ( 20 ) of the slot ( 18 ) forming the receptacle takes entrainment. 6. Electrical switchgear according to claim 5, characterized in that the link guide ( 15 ) is part of a housing ( 16 ) which supports the coupling rod ( 14 ) downwards. 7. Electrical switchgear according to one of the preceding Ansprü surface, characterized in that the insertion aid ( 10 ) comprises a pivot lever ( 12 ) zugeord Neten manually and / or electromotively actuated drive ( 13 ). 8. Electrical switchgear according to claim 7, characterized in that the manual drive ( 21 ) from the front of the slide-in aid ( 10 ) can be actuated and that the frame ( 1 ) before the slide-in aid ( 10 ) has a plate ( 23 ) , which is provided with a closing plate ( 25 ) which can be closed via a first access opening ( 24 ) for the manual drive ( 21 ). 9. Electrical switchgear according to claim 8, characterized in that the first closure plate ( 25 ) is loaded by a restoring force into its position closing the access opening ( 24 ) for the manual drive ( 21 ). 10. Electrical switchgear according to one of the preceding Ansprü surface, characterized in that at least part of the device insert ( 3 ) associated safety devices in the frame ( 1 ), in particular in the region of the insertion aid ( 10 ) is arranged. 11. Electrical switchgear according to one of the preceding Ansprü surface, characterized in that a socket is provided for a power supply and control plug, and that a locking device is provided by which pulling out of the plug is prevented as long as the insertion aid ( 10 ) is actuated and which blocks the slide-in aid ( 10 ) as long as the plug is not inserted. 12. Electrical switchgear according to claim 11, characterized in that the blocking of the plug on the position of the first United circuit board ( 25 ) is controlled, which in turn can only be pushed into its release position of the spindle access ( 24 ) ver when the plug is inserted. 13. Electrical switchgear according to claim 12, characterized in that the first closing plate ( 25 ) raises and lowers a rod via a sliding block, through which the plug is blocked or released and which can only be raised when the plug is inserted. 14. Electrical switchgear according to claim 13, characterized, that the socket for receiving a commercially available plug is formed and that a receptacle for the plug in front of the socket is provided between a first and a second position is displaceable and pulling the plug in the first position blocked and lifting the rod allows in the second position on the other hand releases the plug and bloc the rod against lifting kiert. 15. Electrical switchgear surface according to one of the preceding claims, characterized in that a switching device is provided in the frame ( 1 ), which can be switched on electrically, that means are provided by which the switching device, when the slide-in aid ( 10 ) is actuated, switch against an on is secured, and that means are provided by which the insertion aid ( 10 ) is blocked when the switching device is switched on. 16. Electrical switchgear according to claim 15, characterized in that the first closure plate ( 25 ) when releasing the access opening ( 24 ) drives a push rod ( 37 ) mounted in the frame ( 1 ), which actuates a switch ( 43 ), which switches the inrush circuit of the switching device, and that the push rod ( 37 ) is blocked when the switching device is switched on. 17. Electrical switchgear according to claim 16, characterized in that a cam ( 36 ) is arranged on the switch-on shaft ( 35 ) of the switching device, through which the push rod ( 37 ) is blocked when the switching device is switched on, and that the cam ( 36 ) is one Has recess ( 39 ) into which the raised push rod ( 37 ) in the rest position of the switch-on shaft ( 35 ) can be locked to block it. 18. Electrical switchgear according to one of the preceding Ansprü surface, characterized in that an earthing switch is provided in the frame ( 1 ) that means are provided by which the earthing switch is blocked against actuation when the slide-in aid ( 10 ) is actuated, and that means are provided through which the slide-in aid ( 10 ) is blocked when the earthing switch is actuated. 19. Electrical switchgear according to claim 18, characterized in that the earthing switch can be actuated via a mechanically drivable earth shaft ( 27 ) running parallel to the insertion direction (I), that the first closure plate ( 25 ) is extended to the earth shaft ( 27 ) and this in their open position with a cut out according to the shaft cross-section ( 28 ) and thereby prevents an engagement of an operating tool for the earth shaft ( 37 ). 20. Electrical switchgear according to claim 18 or 19, characterized in that a second closure plate ( 29 ) for access ( 24 ) to ma manual drive ( 21 ) is provided, which is operable via the rotation of the derwelle ( 27 ) and in Earthing position of the earthing shaft ( 27 ) closes the access ( 24 ), in the basic position releases it. 21. Electrical switchgear according to claim 20, characterized in that the insertion compartment (2) via a door (9) closed, that means are provided by which is blocked in the retracted drawer unit (3) against an opening of the insertion compartment door (9), and that means are provided through which the device insert ( 3 ) is blocked against insertion with the insert aid ( 10 ) when the insert compartment door ( 9 ) is open. 22. Electrical switchgear according to claim 21, characterized in that a biased by a spring in its closed position Ver closure plate ( 25 ) for access ( 24 ) is provided, which is moved into its release position by closing the slot door ( 9 ). 23. Electrical switchgear according to claim 22, characterized in that the closure plate ( 25 ) for an emergency actuation for a work tool is accessible. 24. Electrical switchgear according to one of the preceding Ansprü che, characterized in that a closable by a door (8) the cable connection compartment (7) is provided, particularly below the insertion compartment (2), and that the cable compartment door (8) when not switched grounding against opening is blocked. 25. Electrical switchgear according to claim 24, characterized in that a movable via the earth shaft ( 27 ) rail ( 33 ) is provided with a locking section ( 34 ) which releases the cable connection chamber door ( 8 ) when the earth shaft ( 27 ) is actuated and in the basic position be sensitive earth shaft ( 27 ) this locked. 26. Electrical switchgear according to claim 25, characterized in that the locking section ( 34 ) against a spring force relative to the slide ne ( 33 ) can be pivoted into a release position and a tool is accessible for emergency operation. 27. Electrical switchgear according to one of the preceding claims, characterized in that an electrically actuated locking magnet is additionally provided for the earth shaft ( 27 ) and / or for access ( 24 ) to the manual drive, through which the earth shaft ( 27 ) or the security devices assigned to the access ( 24 ) can be actuated.