EP2790201B1 - Device cover of a low voltage high power fuse - Google Patents

Description

The invention relates to a device cover of a low-voltage high-performance fuse switching device, hereinafter referred to as NH-fuse switching device, with a cover portion, two connected to the lid portion mounting portions for suspended storage of two handle tabs of a low-voltage high-performance fuse link, hereinafter referred to as NH fuse-link or fuse link , Wherein the grip tabs, when inserting the fuse insert into the device lid and when removing it from the device lid, are guided by means of the holding sections, as well as with a locking device connected to the lid section for releasably locking one of the handle tabs of the fuse link used in the device cover, wherein the locking device protrudes in a first position in the way of this grip tab during insertion and removal of the fuse link, and moved out in a second position from this way the grip tab, and with an actuator for Actuation of the locking device.

Such a device cover is from the DE 199 11 852 A1 known. In this case, the locking device has a running in the transverse direction of the fuse switching device slide on which a protruding latch in hook form is attached via a web. This hook can engage behind a gripping tab of the fuse link. To remove the fuse insert actuates an actuator that has a protruding from a side wall of the device cover button. The button is followed by the slider. If you press the button, then the slider is moved against the force of a compression spring, bringing the latch moves into an unlocked position so that the fuse link from the device cover separated and thus can be removed from the fuse switching device. If the gripping tab of the fuse link past the bolt, the compression spring pushes the slider back to its original position, thus the position corresponding to the lock. If a fuse link in the device cover are used, the grip tab is pressed against an inlet slope of the bolt, whereby the latch is transferred to the open position until the handle has passed the latch. Under the force of the spring, the slider and thus the bolt is moved back to its original position, whereby the grip tab is locked.

This design of the device cover is constructive and consuming in Montageaspekt, as a key, a slide with bolt and a compression spring are provided. As a result, the mounting of the device cover in the field of locking device and actuator designed quite expensive and It is due to this variety of parts a fairly high number of items to stockpile.

From practice, a device cover of the type mentioned is known in which a trained as a button or plate actuator is provided for actuating the locking device. In this case, the actuating device and the locking device are separate components, so that an increased installation effort is recorded in this device cover. Upon depression of the actuating device, this acts on the actuating device, which forms a component together with the device cover, wherein the locking device, under the action of the actuating device, is elastically deformable and thus an approach of the locking device is disengaged from the grip tab, so that the fuse link from the device cover can be taken out. To insert the fuse link in the device cover this is inserted with its grip tabs in the mounting portions, the gripping tab, which is associated with the locking device acts upon insertion of the fuse link to the locking device and pivots it.

A device cover having the features of the preamble of patent claim 1 is known from DE 297 21 425 U1 known. In this case, in particular, the actuating device and the locking device form a component. In the region of the respective grip tab, a locking device is provided in the manner of a single bolt, wherein the bolt is pivotable by the action of a compressive force on an actuating device together with this from a rear grip position of the grip tab, so that the fuse link moves past the locking device and thus removed from the device cover can be.

A device cover, which also has the features of the preamble of claim 1, is further from the EP 1 914 780 A2 known. In this case, the device cover takes in the area of a grip tab of the respective fuse link the component that forms the actuating device and the locking device is pivotable. The locking device has two blocking pieces, which are brought under the action of a spring force in a rear grip position with respect to the associated grip tab of the fuse link. By actuating the actuating device against the spring force, the two blockage pieces can be pivoted out of the area of the grip tab so that the fuse link can be guided past the blockade pieces and removed from the device cover.

Object of the present invention is to develop a device cover of the type mentioned so that it has a minimum number of parts in the range of actuator and locking device, so that the number of components to be stored and the assembly cost is reduced.

The problem is solved by a device cover having the features of claim 1.

This design of the device cover can simplify its assembly, because the number of components that make up the device cover is reduced. In particular in the area in which a secure holding of the NH fuse-links in the device cover is to be ensured, namely in the region of the locking device for the respective NH fuse-link and the actuator for actuating the locking device a permanent functionality is ensured as the actuating device and locking device is a component form. Actuating forces, which are introduced for transferring the locking device into its unlocked position, are introduced directly from the actuating device into the locking device, since the actuating device and the locking device form a component.

In the formation of the locking device of the device cover according to the invention thus the action of an actuating force by means of the actuator causes the locking device is slightly deformed, especially in the region of the two approaches, with the consequence that the two, the locking device associated projections move away from each other and As a result, the projections are moved out of the locking position. The gripping tab can therefore, without being blocked by the two projections, be moved past the projections, whereby the NH fuse-link can be moved out of the mounting portions, for removing the NH fuse-link. It is not necessary here to take the possibly hot NH fuse-link by hand, but it can by arrangement of the device cover, based on the arrangement of the device cover, lower arrangement of the locking device, the NH fuse-link due to its weight on the locking device move past.

It is considered to be particularly advantageous under the aspect of particularly simple production and optimum component design, when the actuating device and the locking device are designed as a plastic injection molded part. It is considered particularly advantageous if not only the actuating device and the locking device are designed as a plastic injection molded part, but also other components of the device cover, so that the assembly costs and the variety of components of the device cover can be further reduced. In particular, it is provided that the cover portion, the actuating device, the locking device and the support portions for suspended mounting of the grip tabs of the respective NH fuse-link are formed as a single plastic injection molded part.

Structurally particularly simple and ergonomically favorable, the actuating device is designed when it is button-shaped or dish-shaped. In this design, the area of the actuator is substantially the same as that required to depress the actuator with the surface of a fingertip.

Preferably, the actuator is connected on radially opposite sides of the knob or plate with leg portions of the connecting element, wherein the respective leg portion is formed as a wall. With this design, the function of the deformability of the connecting element when operating the connecting element by means of the actuating device can be realized with a low material usage due to a relatively thin wall thickness.

Preferably, the respective wall is connected in the region of the end facing away from the knob or plate in a first region with the device cover and in a second area connected to the projection. This design provides a sufficient extent of the wall to provide between the actuator and the projections a sufficient way to move apart of the projections in order to release the locking of the grip tab.

It is considered to be particularly advantageous if the actuating device, based on an insertion of the fuse link when inserting a grip tab in the locking device associated support portion is arranged at a distance from the attachment of the locking device on the device cover, and the region of the locking device in the first Position in the path of the handle tab projects, is arranged perpendicular to the insertion of the fuse link, at a distance from the attachment of the locking device on the housing cover.

Such a design allows a compact design of actuator and locking device. The projections can be moved away from each other, for releasing the locking of the grip tab. A sufficient moment can be introduced via the actuating device into the locking device in order to elastically deform the latter such that the two projections, for releasing the locking of the grip tab, are moved sufficiently far away from one another.

It is considered advantageous if the actuating device and the housing cover are arranged approximately in one plane. As a result, the actuating device can be actuated ergonomically particularly favorably, since, when approaching a fingertip for actuating the actuating device, the fingertip is guided through the housing cover or the housing cover and the actuating device. The actuator passes through a recess in the housing cover and is accessible from the outside of the NH fuse switching device.

According to an advantageous development, it is provided that the housing cover has projections directed towards one another, wherein, arranged between the projections, the projections of the locking device are connected to the projections. This mounting of the projections of the locking device in the projections makes it possible for the projections of the housing cover to yield slightly upon the action of a force on the locking device by means of the actuating device, with the consequence that this flexibility also leads to the yielding of the projections of the locking device away from one another Moving these projections, for releasing the locking of the grip tab, contributes.

Preferably, the lugs of the locking device and / or the projections of the locking device and / or the leg portions of the connecting element and / or the projections of the housing cover are formed thin-walled. This thin-walled design not only contributes to material savings, but reduces the bending stiffness of the respective said component, with the consequence that for deforming the locking means for releasing the locking of the grip tab only a reduced operating force which must act on the actuator is required.

The actuating device and the locking device are in particular formed symmetrically to a plane. This plane extends in particular to a plane which is perpendicular to the pivot axis of the device cover in a device lower part of the NH-fuse switching device.

The lugs of the locking device are arranged in particular adjacent to the one holding portion for a gripping tab of the NH fuse-link.

The actuating device in particular passes through a recess in the cover section towards the outside of the fuse switching device.

According to a development it is provided that in the cover portion a cover is slidably mounted, which has at least one test hole for inserting a test tool to a live device element in a shifted test position of the cover, wherein the cover in the closed position with lugs surrounding the actuator. An NH fuse switching device with a device cover and a sliding cover is, for example, from DE 36 39 669 A1 known.

Further features of the invention are set forth in the subclaims, the description of the drawing and the drawing itself, wherein it is noted that all individual features and all combinations of individual features are essential to the invention.

Fig. 1

ein NH-Sicherungsschaltgerät, das auf einem Sammelschienensystem montiert ist, in einer räumlichen Darstellung veranschaulicht, wobei das Sicherungsschaltgerät den erfindungsgemäßen Gerätedeckel aufweist, der in seiner Schließstellung gezeigt ist,

Fig. 2

den in Fig. 1 veranschaulichten Gerätedeckel, in einer räumlichen Darstellung gezeigt, bei vom Gerätedeckel entfernten Abdeckscheiben,

Fig. 3

eine Draufsicht des Gerätedeckels, veranschaulicht für zwei in diesem eingesetzte, modifizierte Abdeckscheiben und eine entfernte Abdeckscheibe,

Fig. 4

eine räumliche Ansicht eines NH-Sicherungseinsatzes mit Grifflaschen, wobei jeder der drei Phasen des NH-Sicherungsschaltgeräts ein derartiger NH-Sicherungseinsatz zugeordnet ist,

Fig. 5

für den Bereich der Fig. 3, bezüglich dessen die Abdeckscheibe entfernt ist, der Bereich des Gerätedeckels, der den Halterungsabschnitt zur aufgehängten Lagerung der einen Grifflasche des NH-Sicherungseinsatzes sowie die Verriegelungseinrichtung für diese Grifflasche und die Betätigungseinrichtung für die Verriegelungseinrichtung aufweist, in einer Draufsicht, von der Außenseite des Gerätedeckels gesehen, bei nicht in den Halterungsabschnitt eingesetzter Grifflasche und in Verriegelungsstellung befindlicher Verriegelungseinrichtung,

Fig. 6

die Anordnung gemäß Fig. 5 für den Betriebszustand gemäß Fig. 5, veranschaulicht in einer Ansicht von der Innenseite des Gerätedeckels,

Fig. 7

die Anordnung gemäß Fig. 5, in einer Ansicht gemäß Fig. 5, veranschaulicht für die vom Halterungsabschnitt aufgenommene Grifflasche,

Fig. 8

die Anordnung gemäß Fig. 6, in einer Darstellung gemäß Fig. 6, veranschaulicht bei in Entriegelungsstellung befindlicher Verriegelungseinrichtung,

Fig. 9

einen Schnitt durch die Anordnung gemäß der Fig. 5 und 6, geschnitten in einer Symmetrieebene von Halterungsabschnitt und Verriegelungseinrichtung, die senkrecht zu der Schwenkachse des Gerätedeckels in einem Geräteunterteil des NH-Sicherungsschaltgeräts verläuft,

Fig. 10

ein Schnitt durch den Gerätedeckel im Bereich der Verriegelungseinrichtung, senkrecht zur Schnittebene gemäß Fig. 9 geschnitten,

Fig. 11

eine räumliche Ansicht des Gerätedeckels im Bereich des Halterungsabschnitts, der Verriegelungseinrichtung und der Betätigungseinrichtung, schräg von oben gesehen.

In the drawing, the invention is illustrated by a preferred embodiment, without being limited thereto. It shows:

Fig. 1

a NH fuse circuit breaker, which is mounted on a busbar system, illustrated in a three-dimensional representation, wherein the fuse switching device comprises the device cover according to the invention, which is shown in its closed position,

Fig. 2

the in Fig. 1 illustrated device cover, shown in a three-dimensional view, with cover plates removed from the device cover,

Fig. 3

a top view of the device cover, illustrated for two used in this modified cover plates and a remote cover,

Fig. 4

a spatial view of a NH fuse-link with grip tabs, wherein each of the three phases of the NH-fuse switching device is associated with such NH fuse-link,

Fig. 5

for the field of Fig. 3 with respect to which the cover plate is removed, the area of the device cover, which has the mounting portion for suspended mounting of a gripping tab of NH fuse-link and the locking means for this handle and the locking device actuating device, in a plan view, viewed from the outside of the device cover in the case of a gripping tab not inserted into the holding section and in the locking position of the locking device,

Fig. 6

the arrangement according to Fig. 5 for the operating state according to Fig. 5 , illustrated in a view from the inside of the device cover,

Fig. 7

the arrangement according to Fig. 5 , in a view according to Fig. 5 , illustrated for the grip tab received by the holding portion,

Fig. 8

the arrangement according to Fig. 6 , in a representation according to Fig. 6 , Illustrated in befindlichem in unlocking position locking device,

Fig. 9

a section through the arrangement according to the FIGS. 5 and 6 , cut in a plane of symmetry of mounting portion and locking device, which is perpendicular to the pivot axis of the device cover in a device lower part of the NH fuse switching device,

Fig. 10

a section through the device cover in the region of the locking device, perpendicular to the cutting plane according to Fig. 9 cut,

Fig. 11

a spatial view of the device cover in the region of the support portion, the locking device and the actuator, seen obliquely from above.

Fig. 1 shows a low-voltage high-performance fuse switching device - NH-fuse switching device - hereinafter referred to for simplicity as a fuse switching device 1, which serves to protect three phases R, S, T and is connected to a three busbars 2 having busbar system. The busbars 2 are arranged parallel to one another and horizontally to each other and illustrated only over a partial length. The fuse switching device 1 has a device base 3 made of plastic with six mounted in this contacts with terminals. Each phase has two contacts for insertion of a NH fuse-link, further connected to the respective contact terminal, wherein the one terminal is connected to a busbar 2 and the other terminal is connected to a power cable. Illustrated are three break-out lid elements 4, through which a connection cable can be led out of the lower device part 3 with broken cover element 4.

In the lower part of the device 3, a device cover 5 is pivotally mounted, which in the region of its end facing away from the pivot axis has a handle bar 6 arranged parallel to the pivot axis.

On the side facing away from the busbars 2, the device cover 5 has a cover section 7. This runs in the closed position of the device cover 5, as in Fig. 1 is shown, substantially parallel to the plane formed by the busbar 2.

Placed perpendicular to the longitudinal extent of the handle bar 6, the three NH fuse-links, hereinafter referred to briefly as fuse links 8, mounted in the lid portion 7 in the lid. Such a fuse link 8 is in the Fig. 4 illustrated. This is well known from the prior art. The fuse link 2 consists of a hollow insulating body 9 with over its axial extent constant cross-section. Both ends of the insulating body 9 are closed with closure plates 10. In each closure plate 10, a contact blade 11 is held. The two contact blades 11 are electrically connected by a not shown, projecting through the insulating body 9 working fuse. To indicate that the fuse is off, it has a signaling device 12, which has a detector wire, which is guided electrically parallel and at a distance from the display fuse through the insulating body 9. When switching off the fuse melts the detector wire, so that the reporting device 12 indicates the state of the disabled fuse. Within the insulating body 9 is extinguishing sand. The respective closure plate 10 is fastened by means of two screws 13 which pass through holes in the closure plate 10 and in a sealing plate 14 arranged between the closure plate 10 and the insulating body 9 and are screwed into threaded holes of the insulating body 9. In the area of the end facing away from the contact blade 11, the respective closure plate 10, which consists of metal, is provided with a grip tab 15. This gripping tab 15 is arranged in the plane of the closure plate 10 and has a tapered central portion 16 between a main portion 17 of the closure plate 10 and a freely over the insulating body 9 projecting relative to the central portion 16 extended tab portion 18.

In the region of the respective grip tab 15, the respective fuse link 8 is held in the cover section 7 of the device cover 5. This is clear from the presentation of the Fig. 2 and 3 , There, per phase of the fuse switching device 1, two associated with the lid portion 7 support portions 19 and 20 illustrates, each support portion 19 and 20 of the suspended storage of a gripping tab 15 is used. Each of the support portions 19, 20, wherein the respective support portion 20, based on the insertion direction of the fuse link 8 has a greater length than the support portion 19, has two successive web-shaped projections 21, 22. Between the projections 21 and 22 is placed in the device cover 5 inserted fuse insert 8 of the central portion 16 of the handle 15 and there is the extended tab portion 18 of the handle 15 on the projections 21 and 22. This results in the suspended mounting of the fuse link 8 in the device cover. 5

The Fig. 1 to 3 illustrate that the device cover 5 per phase has a slidably mounted in this, partially transparent cover plate 23. In the Fig. 1 these three covers 23 are shown in their closed position. In the Fig. 2 are the three covers 23 away from the lid portion 7, that is pushed out of this. Fig. 3 shows two cover discs located in the closed position 23 and a remote cover, so that in the plan view illustrated therein, the invention relevant area of the device cover 5 is better visible.

The respective cover plate 23 has a test hole 24 for inserting a test tool to a live device element, for example, to a contact blade 11 of the fuse link 8 in a shifted test position of the cover 23. An arrow 25 illustrates the direction of displacement of the cover 23 during the transfer of its closed position in its open position.

The grip tabs 15 of the respective fuse link 8 are guided at the onset of the fuse link 8 in the device cover 5 by means of the support portions 19 and 20. The region of the one support portion 19 is associated with a locking device 26 which is connected to the lid portion 7 and the releasable locking of the handle tab 15 of the fuse link 8 is used, which is inserted into the support portion 19.

The locking device 26 has two associated with the device cover 5 lugs 27, 28. The respective approach 27 or 28 has, at a distance from the connection of projection 27, 28 and device cover 5, a projection 29, 30, which is directed to the other projection 30, 29 to. In the insertion direction of the grip tab 15 and the fuse link 8, the respective projection 29, 30 has an insertion bevel 31. The protrusions 29, 30 are, with respect to the withdrawal direction of the grip tab 15 and the securing insert 8 with their contact edges 32 positioned perpendicular to the removal direction of the grip tab 15. The insertion direction is the arrow A, the removal direction with the arrow B in Fig. 5 illustrated.

The two lugs 27 and 28 are connected by means of a connecting element 33. This has an actuating device 34 at a distance from the projections 29, 30. This is in the region of the side, which is assigned to the outside of the fuse switching device 1, button-shaped or dish-shaped.

The actuator 34 is connected on radially opposite sides of the knob or plate with leg portions 35, 36 of the connecting element 33. The respective leg portion 35 and 36 is formed as a wall.

The lid portion 7, the actuator 34, the locking device 26 and the support portions 19, 20 are formed as a component, said assembly is formed as an injection molded part.

The respective leg section 35 or 36 is connected in the region of the end facing away from the knob or plate 34 in a first region with the device cover 5 and in a second region with the projection 29 or 30.

The actuator 34 is, based on the insertion direction A of the fuse link 8 when inserting a grip tab 15 in the support portion 19, spaced from the attachment of the locking device 26 on the device cover 5. The contact edges 32 of the projections 29, 30 are arranged at a small distance from the projections 21 and 22 of the support portion 19.

The actuator 24 and the device cover 5 are arranged approximately in one plane. The device cover 5 has mutually aligned projections 37, 38, wherein, arranged between the projections 37, 38, the Lugs 27, 28 of the locking device 26 with the projections 37, 38 are connected.

The locking device 26 is thus mounted on the two projections 37, 38 in the lid portion 7, wherein already the projections 37, 38 allow a slight compliance of the locking device 26 upon application of a force on the actuator 34. When acting on the actuator 34 by pressing the button of the actuator, a force in the two leg portions 35, 36 and thus the lugs 27, 28 is introduced via the actuator 34, whereby the locking device 26 elastically deformed and the projections 29, 30th from the position according to Fig. 5 , are moved apart when not actuated actuator 34, in the position according to Fig. 8 In this case, the distance between the two projections 29, 30 is greater than the distance between the two projections 21, 22, so that now the fuse link 8 in the direction of arrow B to the projections 29, 30 can be moved past.

The locking device 26 thus protrudes in the in Fig. 5 shown in the first position in the path of the grip tab 15 during insertion and removal of the fuse link 8, and is in a second position, as shown in Fig. 8 is illustrated, moved out of this way the handle tab 15 out.

The insertion of the fuse link 8 is possible without operating the actuator 34, because the grip tab 15 with its central portion 16, the insertion 31 of the projections 29, 30 contacted and when moving the grip tab 15 in the direction of arrow A, therefore, the projections 29, 30 elastically away from each other to be moved. If the gripping tab 15 is guided past the projections 29, 30, the projections 29, 30 move toward one another, into the end position according to FIG Fig. 5 , On the other hand, to remove the fuse link 8, the actuator 34 is urged so that the projections 29, 30 are moved away from each other, in the position shown in FIG Fig. 8 . with which the grip tab 15 can be moved with its central portion 16 between the projections 29, 30.

Fig. 10 illustrates in a solid line the position of the locking device 26 when not actuated actuator 34. The dotted line shows the position of the locking device 26 when actuated actuator 34th

The reference numeral 39, the pivot axis of the device cover 5 is illustrated with respect to the device part 3. The locking device 26 and the actuating device 34 are formed symmetrically to a plane which is perpendicular to the pivot axis 39.

The actuator 34 passes through a recess 40 of a projection 41 of the cover 23 to the outside of the fuse switching device 1 out.

LIST OF REFERENCE NUMBERS

1

Fuse switchgear

2

bus

3

Base casing

4

cover element

5

device cover

6

Grab bars

7

cover section

8th

fuse link

9

insulator

10

closing plate

11

contact blade

12

signaling device

13

screw

14

sealing plate

15

grip tab

16

midsection

17

Bulk

18

tab portion

19

support portion

20

support portion

21

head Start

22

head Start

23

cover plate

24

inspection hole

25

arrow

26

locking device

27

approach

28

approach

29

head Start

30

head Start

31

chamfer

32

contact edge

33

connecting element

34

actuator

35

leg portion

36

leg portion

37

head Start

38

head Start

39

swivel axis

40

recess

41

approach

Claims (14)

1. Device cover (5) of a low voltage, high power fuse device (1) having a cover section (7), two holding sections (19, 20), which are connected to the cover section (7), for mounting two grip taps (15, 15) of a low voltage, high power fuse insert (8) in a suspended manner, wherein the grip taps (15, 15) are guided by means of the holding sections (19, 20) when the fuse insert (8) is inserted into the device cover (5) and when the said fuse insert is removed from the device cover (5), and having a locking device (26), which is connected to the cover section (7), for releasably locking one grip tab (15) from amongst the grip taps (15, 15) of the inserted fuse insert (8) in the device cover (5), wherein the locking device (26), in a first position, projects into the path of the said grip tab (15) when the fuse insert (8) is inserted and removed and, in a second position, is moved out of the said path of the grip tab (15), and having an operating device (34) for operating the locking device (26), wherein the operating device (34) and the locking device (26) form one component, characterized in that the locking device (26) has two shoulders (27, 28) which are connected to the device cover (5), wherein the respective shoulder (27 or 28) has, at a distance from the point at which shoulder (27 or 28) and device cover (5) are connected, a projection (29, 30) which is directed towards the other projection (30, 29), wherein the two shoulders (27, 28) are connected by means of a connecting element (33), and the connecting element (33) has the operating device (34) at a distance from the projections (29, 30), wherein the two projections (29, 30) can be moved away from one another by pressing the operating device (34), in order to release the locking of the grip tab (15).
2. Device cover according to Claim 1, characterized in that the operating device (34) and the locking device (26) are in the form of a plastic injection-moulded part.
3. Device cover according to Claim 1 or 2, characterized in that the cover section (7), the operating device (34), the locking device (26) and the holding sections (19, 20) are in the form of a plastic injection-moulded part.
4. Device cover according to one of Claims 1 to 3, characterized in that the operating device (34) is of button- or plate-like design.
5. Device cover according to Claim 4, characterized in that the operating device (34) is connected to limb sections (35, 36) of the connecting element (33) on radially averted sides of the button or plate, wherein the respective limb section (35, 36) is in the form of a wall.
6. Device cover according to Claim 5, characterized in that the respective limb section (35, 36), in the region of that end of the said limb section which is averted from the button (34) or plate, is connected to the device cover (5) in a first region, and is connected to the projection (29, 30) in a second region.
7. Device cover according to one of Claims 1 to 6, characterized in that the operating device (34), in respect of the insertion direction (A) of the fuse insert (8) when one grip tab (15) is inserted into the holding section (19, 20) which is associated with the locking device (26), is arranged at a distance from the point at which the locking device (26) is fastened to the device cover (5), and the region of the locking device (26) which, in the first position, projects into the path of the grip tab (15) is arranged at a distance from the point at which the locking device (26) is fastened to the device cover (5), perpendicularly to the insertion direction (A) of the fuse insert (8).
8. Device cover according to Claim 7, characterized in that the operating device (34) and the device cover (5) are arranged approximately in one plane.
9. Device cover according to one of Claims 1 to 8, characterized in that the device cover (5) has projections (37, 38) which are directed towards one another, wherein, arranged between the projections (37, 38), the shoulders (27, 28) of the locking device (26) are connected to the projections (37, 38).
10. Device cover according to one of Claims 1 to 9, characterized in that the shoulders (27, 28) of the locking device (26) and/or the projections (29, 30) of the locking device (26) and/or the limb sections (35, 36) of the connecting element (33) and/or the projections (37, 38) of the device cover (5) are of thin-walled design.
11. Device cover according to one of Claims 1 to 10, characterized in that the locking device (26) and the operating device (34) are arranged symmetrically with respect to one plane, in particular with respect to a plane which is perpendicular to a pivot axis (39) of the device cover (5) in a device lower part (3) of the fuse device (1).
12. Device cover according to one of Claims 1 to 11, characterized in that the projections (29, 30) of the locking device (26) are arranged adjacent to one holding section (19).
13. Device cover according to one of Claims 1 to 12, characterized in that the operating device (34) passes through a recess (40) in the cover section (7), to the outside of the fuse device (1).
14. Device cover according to one of Claims 1 to 13, characterized in that a covering plate (23) is displaceably mounted in the cover section (7), the said cover plate having at least one test hole (24) for plug-connecting a test instrument to a live device element in a displaced test position of the covering plate (23), wherein the covering plate (23), in its closed position, surrounds the operating device (34) by way of shoulders (41).

Images