EP1560245A1 - Cartridge fuse particularly for a low-voltage high-power fuse - Google Patents

Abstract

An operative melting conductor (OMC) (4) fits in a tubular sleeve body (2). An indicator (9) shows an electric fuse link's (1) 'ready/released' operating status (OS). An indicator melting conductor (13) connects electrically in parallel to the OMC. Held under tension of a spring (11) by the OMC in a 'ready to operate' OS, an indicating pin (10) links to the spring as a visible indicator of OS.

Description

The invention relates to an electrical fuse link, in particular for a Low-voltage high-performance fuse, with one in a tubular Sheath body arranged working fuses and with a display device to display the operating states "ready" and "triggered" of the Fuse insert, consisting of an electrically parallel to the Working smelter switched indicator melting conductor and one with a Spring element connected characteristic element for visual display of the Operating conditions, that of the display melting in the operating state is kept "ready" under tension of the spring element.

From the German utility model DE 298 07 928 U1 is already an electrical Fuse link, in particular a low voltage high performance fuse link, with a working conductor arranged in a housing and a display device. The housing consists essentially of a tubular shell body in which runs centrally the working fusible conductor and whose ends are closed with an upper and a lower end plate. To each of these end plates, a contact blade is arranged, which is extends at right angles and outwards from the end plates. The two Contact blades are electrically connected to the working fusible link. With these Contact blades, the fuse link is electrically in a fuse box used and there in appropriate spring clips mechanically and solvable held. To handle the fuse in the usual way the Face plates over the jacket body to the front of the fuse link extended and form handle tabs on which a handle can be placed.

The working flux described above is from a display device supervised. This display device has a display fusion conductor, which as Wire formed and arranged electrically parallel to the working fusible conductor is. The display device further consists of a spring element and a Identifier element which is connected to the spring element. Of the Display melting conductor has the task to bias the spring element. For this is the display fusible conductor having one end with the spring element and with the the other end with the inside of the lower face plate spot welded. The Spring element is supported on the opposite of the indicator element End at the upper face plate and is in the relaxed state z-shaped. If the indicator fuses melt, the spring element can relax and the strip-shaped indicator element is relative to the top of the upper Face plate moves outward, allowing the fuse to blow from the outside is recognizable. For this purpose, two colored markings are on the indicator element arranged in the area of the upper face plate and the front of the Fuse insert to be visible. In the area of the jacket body is the Indicator element guided in a bore extending from the upper faceplate extends downwards and ends in the region of the middle of the jacket body. Cross to this bore extends in its end a transverse channel, on the front side of the sheath body ends and thus a clear view of the lower mark of Identifier element allowed. The triggered element becomes the indicator element upward from the bore in the shell body of the spring element pulled out so that the one of the two marks on the Detector element is visible from the front side and the lower mark on the indicator element is no longer visible through the transverse channel.

This embodiment of the display device with a characteristic element whose Markings from the front and also the front side of the fuse link are visible, is also referred to as a double indicator. The aforementioned Low-voltage high-performance fuses will also be NH fuses and whose inserts are called NH cartridges.

Furthermore, from DE 298 14 737 U1 a fuse link for NH fuses known, the Kennmelderelement of a film strip Polyethylene exists. To connect the indicator element with a Spring element for triggering the fuse link is the film strip simply pressed on a mandrel of the spring element, so that the film strip is pierced by the spine. The mandrel is provided with undercuts, to prevent the film strip from slipping off the mandrel.

Furthermore, European Patent EP 1 051 719 B1 describes another NH cartridge with a double identifier. There is the Kennmelderelement off Spring band steel produced and merges seamlessly into the spring element. The Spring element is thus integrated in the characteristic element. To the assembly of the To facilitate Kennmelderelements is the beginning of the spring element area already connected to a stopper. Also, the indicator fusion is already with connected to the spring element and guided by the plug. The Indicator element, the plug and the indicator fuse thus form a preassembled unit. Over the plug can thus this unit with the NH cartridge be connected by placing the plug in a filling is plugged, the usual way in the end plate of the NH cartridge is present. The spring element region facing away from the end of the Kennmelderelements is In this case, then in another hole with sight in the front of the Sheath body plugged.

Based on this prior art, the present invention is the Task underlying a fuse link, especially for NH fuses, too create, the display device has a simple construction.

This object is achieved by an electric fuse link with the features of claim 1 solved. Advantageous embodiments of the invention are in the Claims 2 to 20 specified.

According to the invention in an electrical fuse link, in particular for a low-voltage high-performance fuse, with one in a tubular Sheath body arranged working fuses and with a display device to display the operating states "ready" and "triggered" of the Fuse insert, consisting of an electrically parallel to the Working smelter switched indicator melting conductor and one with a Spring element connected characteristic element for visual display of the Operating conditions, that of the display melting in the operating state "ready" is held under tension of the spring element, a simple Construction achieved in that the display fusion conductor with one end in Area of Kennmelderelementes clamped to the shell body or is fixed by clamping on the indicator element. Especially This advantageously achieves that the upper end of the display melting conductor particularly easy with the jacket body in the area of the indicator element or the indicator element can be connected. Thus, can the otherwise usual spot welding of the display melting conductor with the Identifier element omitted.

It is particularly advantageous that the display melting conductor is wire-shaped and directly acts on the upper end of the Kennmelderelementes. The wire-shaped Design facilitates its clamping attachment.

In a preferred embodiment, the spring element is designed as a helical spring. As a result, a particularly high switching force of the characteristic element is achieved; an actuation of micro switches over this is possible.

In a first embodiment of the invention it is provided that the Indicating fusion conductor with the end in the area of the indicator element via a Holding element is clamped attached to the sheath body. Here is the Display fusion conductor is guided over the indicator element and thus holds this. In the run-up to assembly, the indicator element and the indicator fusion conductor need to be used thus not yet connected.

It is also provided that the spring element in the wall of the jacket body is arranged. Thus, the spring element is housed protected and can by the subsequent assembly operations and during operation of the fuse element not be damaged. The reliability of the display device of Fuse insert is thus retained.

In a preferred embodiment it is provided that the spring element is in Sheath body supports and outside of the ends of the indicator element to the Identifier element is attached.

It is also advantageous that the indicator element is rod-shaped, in a bore of the jacket body between the operating states "ready for operation" and "triggered" is arranged displaceable and in the operating state "triggered" off the front side of the jacket body protrudes. The rod-shaped design of Indicator element allows in addition to the visual indication of the triggering state by its rigidity also an actuation of microswitches for a remote display.

In one embodiment, it is provided that the holding element in the opening of the Hole is inserted and the upper end of the indicator melt between the holding element and the bore is clamped.

Characterized in that the spring element with its force action direction parallel to Moving direction of the indicator element is aligned, is particularly good transmit the spring force to the stiff detector rod. An actuation of Micro switches can thus be done safely.

A constructive alternative provides that the holding element as a U-shaped Clamp is formed, with one leg in the opening of the hole is plugged in and the top of the display fuse between the Holding element and the bore is clamped.

In this embodiment, therefore, all components are the Display device in close contact with the sheath body and can completely Pre-assembled before the sealing plates and the end plates with the Sheath housings are screwed.

In a second embodiment of the securing element is advantageous manner provided that the display fusion conductor via a sleeve-shaped Guiding element is led out of the sheath body. A hole in the Sheath body exclusively for the display melting conductor can thus be omitted.

It is particularly advantageously provided that the spring element in the operating state "ready for use" is arranged almost completely in the guide element. Consequently the spring element is particularly space-saving in this operating condition arranged and does not lead to an increase in the size of the display device. Also, thus, the spring element is housed protected and can by the subsequent assembly operations are not damaged. The functional safety the display device of the fuse link is thus retained.

Because the guide element is sleeve-shaped, can as a coil spring trained spring element particularly space-saving in the of the Guide element formed cavity can be accommodated. In addition, the usable coil spring a simple standard component, which in addition to a sufficient and linearly directed spring force to trigger the Display device has. Also, the coil spring a particularly high Generate switching power that can be used to operate micro-switches.

Particularly advantageously, the spring element is installed such that the Spring element is supported in the guide element and its the guide element opposite end is connected to the indicator element.

In a conventional manner, the sleeve-shaped guide element is in the manner of a Plug in an opening of an adjacent to the shell body end plate used and the opening of the guide element of the sheath body away is directed. The thus existing previously unused opening is now for Recording the spring element used.

In a preferred embodiment, it is provided that the identification element angularly formed with a short leg and a long leg is the long leg in a guide channel in front of the jacket body between the operating states "ready" and "triggered" displaced is arranged and in the operating state "triggered" from the front of the Sheath body protrudes.

A particularly simple guidance of the characteristic element is achieved by that the guide channel in the front side of the jacket body over a on the Front side of the jacket body arranged front panel is closed to the outside.

Characterized in that the spring element with its force action direction parallel and laterally offset from the direction of displacement of the long leg of the Kennmelderelementes is aligned, this can be particularly smooth in the Guidance channel from the operating state "ready for operation" into the operating state be moved "triggered".

Because the spring element with its force action direction parallel to Longitudinal extension of the guide element is aligned, this can in the tensioned state almost completely housed in the guide element become.

In a structurally preferred embodiment of the display melting conductor is wire-shaped and the top of the display fusing conductor is directly to the short leg connected to the indicator element.

The above-described embodiment of the display device, in particular of of the indicator element, is particularly suitable for the operating state of Fuse on his front page and on its front page display. Basically, only a forehead display is feasible.

Constructively particularly simple is that the indicator element as anodized red Alu-strip is formed.

Figur 1

eine Seitenansicht eines Sicherungseinsatzes für NH-Sicherungen in einer ersten Ausführungsform teilweise im Schnitt,

Figur 2

eine Frontansicht des Mantelkörpers des Sicherungseinsatzes gemäß Figur 1,

Figur 3

eine Draufsicht auf einen Mantelkörper des Sicherungseinsatzes gemäß Figur 1,

Figur 4

eine Draufsicht auf eine obere Dichtungsplatte des Sicherungseinsatzes gemäß Figur 1,

Figur 5

eine Draufsicht auf eine obere Stirnplatte des Sicherungseinsatzes gemäß Figur 1,

Figur 6

einen Ausschnitt einer Seitenansicht eines Sicherungseinsatzes für NH-Sicherungen in einer zweiten Ausführungsform teilweise im Schnitt,

Figur 7

eine perspektivische Detailansicht eines Halteelementes des Sicherungseinsatzes gemäß Figur 6,

Figur 8

eine Draufsicht auf einen Mantelkörper des Sicherungseinsatzes gemäß Figur 6,

Figur 9

eine Seitenansicht eines Sicherungseinsatzes für NH-Sicherungen in einer dritten Ausführungsform teilweise im Schnitt,

Figur 10

eine Draufsicht auf einen Mantelkörper des Sicherungseinsatzes gemäß Figur 9,

Figur 11

eine Seitenansicht eines Sicherungseinsatzes für NH-Sicherungen in einer vierten Ausführungsform teilweise im Schnitt,

Figur 12

eine Frontansicht des Sicherungseinsatzes gemäß Figur 11 und

Figur 13

eine Ausschnittsvergrößerung des Sicherungseinsatzes gemäß Figur 11 aus dem Bereich des Kennmelderelementes.

The invention will be explained in more detail with reference to four illustrated in a drawing embodiments. Show it:

FIG. 1

a side view of a fuse link for NH fuses in a first embodiment partially in section,

FIG. 2

1 is a front view of the jacket body of the fuse link according to FIG. 1,

FIG. 3

a top view of a jacket body of the fuse link according to Figure 1,

FIG. 4

1 is a plan view of an upper sealing plate of the fuse link according to FIG. 1,

FIG. 5

1 is a top view of an upper end plate of the fuse link according to FIG. 1,

FIG. 6

a section of a side view of a fuse link for NH fuses in a second embodiment partially in section,

FIG. 7

a perspective detail view of a holding element of the fuse link according to Figure 6,

FIG. 8

a top view of a jacket body of the fuse link according to Figure 6,

FIG. 9

a side view of a fuse link for NH fuses in a third embodiment partially in section,

FIG. 10

a top view of a jacket body of the fuse link according to Figure 9,

FIG. 11

a side view of a fuse link for NH fuses in a fourth embodiment partially in section,

FIG. 12

a front view of the fuse link according to Figure 11 and

FIG. 13

an enlarged detail of the fuse link according to Figure 11 from the area of the indicator element.

FIG. 1 shows a side view of a fuse link 1 for NH fuses partly in section. The fuse link 1 consists essentially from a tubular shell body 2 made of steatite with a rectangular Cross-section defining a cavity 3 for a working conductor 4. Of the between the centrally arranged in the sheath body 2 Arbeitsschmelzleiter. 4 and the inner wall of the shell body 2 remaining cavity 3 is with indicated erase sand filled.

The upper and lower end of the sheath body 2 is upper Seal plate 5o and a lower seal plate 5u closed. The Sealing plates 5o, 5u are made of an electrically insulating material, such as For example, Prespan or felt produced and have a size that about to match the outer dimensions of the jacket body 2. To the two Sealing plates 5o, 5u close each one upper and one lower Face plate 6o, 6u, which lie flat on the sealing plates 5o, 5u. The two Face plates 6o, 6u are made of aluminum. According to the rectangular Cross-section of the sheath body 2 are the flat sealing plates 5o, 5u and the End plates 6o, 6u also rectangular. The sealing plates 5o are fastened, 5u and the end plates 6o, 6u on the jacket body 2 via not shown Screws whose shafts in the sheath body 2 in holes 2b (see Figure 2) stop. Usually, each end plate 6o, 6u four screws are provided, the are each arranged in the corner regions of the end plates 6o, 6u. To the End plates 6o, 6u are each a contact blade 7o, 7u by caulking or Attached upsetting, which is electrically connected to the working molten conductor 4. The Contact knives 7o, 7u have essentially the function of the fuse link 1 in resilient retaining clips of a fuse housing, not shown, detachable fasten and at the same time connect electrically with the retaining clips. In order to facilitate the handling of the fuse link 1, the face plates 6o, 6u beyond the jacket body 2 to the front of the fuse link 1 extended and thus form grip tabs 8o, 8u, to the usual manner not shown handle can be attached.

Furthermore, FIG. 1 shows that the working molten conductor 4 has a Display device 9 is assigned, via which the state - ready for operation or triggered - from the upper front side and the front of the fuse link 1 can be read. The display device 9 consists essentially of a characteristic element 10, a spring element 11, a holding element 12 and a display fusion conductor 13. On the basis of the Kennmelderelements 10 can Operator visually recognize the state of the fuse link 1. In the figure 1 the indicator element 10 is shown in the display state "triggered". Of the Display state "ready" is indicated by dashed lines. The indicator element 10 is formed as a longitudinal strip of Alubandrolle and over its entire Length anodized on one or both sides, making it easy for the operator to recognize. To the indicator element 10 between its two To be able to move display states defined, it is guided in a bore 14. FIG. 1 clearly shows that the sheath body 2 is suitable for receiving the bore 14 in FIG Area of the front of the fuse link 1 has a greater wall thickness than in the rest of the field. This bore 14 is parallel to the longitudinal direction of Sheath body 2 is aligned and extends from its upper end to slightly beyond its middle. In the region of the lower end of the bore 14 closes at a right angle, a transverse channel 20, in the front 2f of the Sheath body 2 opens. The transverse channel 20 serves as a viewing opening for the operator. If the red indicator element 10 is seen there, the fuse element is the first operational; if it is not seen, the fuse element 1 is triggered.

Furthermore, this bore 14 is stepped and has a to the upper End face 2o of the shell body 2 subsequent cylindrical upper part 14o and a slit-shaped to form an annular shoulder 14a lower part 14u on. The lower part 14u is slit-shaped to allow itself the indicator element 10 in the bore 14 can not rotate. Like from the Figure 1 can be seen, a portion of the upper part 14o of the bore 14 in Direction whose lower part 14u also conically taper. It is important that the paragraph 14a is maintained, which serves as a support surface for the spring element 11.

The Kennmelderelement 10 is in the form of a helical spring spring element 11 inserted and the paragraph 14a facing away from the end of the spring element 11th is about 2/3 length of Kennmelderelements 10 - seen from below - with the Identifier element 10 connected. Thus, the spring element 11 is under Voltage set when the indicator element 10 in the bore 14 and thus in its display position is "ready" pressed. So that the indicator element 10 the hole in the display state "triggered" can not leave, this is supported upper end of the spring element 11 on the inside of the upper sealing plate 5o off. Accordingly, the dimensions of one in the upper sealing plate 5o provided opening 5a for the guidance of the Kennmelderelementes 10, to the Outer contour of Kennmelderelementes 10 adapted (see also Figure 4); the Spring element 11 with the larger diameter than the characteristic element 10th the opening 5a can not pass.

The display melting conductor 9 has the task that Kennmelderelement 10 with the Spring element 11 in the display state "ready" against the voltage of To hold spring element 11, as long as the display fuse 13 at The response of the fuse link has not yet melted. This is the display fusion conductor 13 electrically parallel to the working fuse 4 connected. Accordingly, the ends of the display fusion conductor 13 are electrically connected to the upper and lower end plate 6o, 6u. Of the Display fuse 13 is a wire made of nickel. The lower End 13u of the display fusion conductor 13 is connected to a second spring element 11 secured by winding, which is inserted in a blind hole 15. This blind hole 15 is located centrally on the bore 14 opposite bottom End face 2u of the shell body 2u and extends in the longitudinal direction of the Sheath body 2. This second spring element 11 has in addition to the above Fixing function also the task of the display fusion conductor 13 electrically to connect the lower end plate 6u. This is simply an opening 5b in the lower seal plate 5u provided by the second spring element 16 extends in the direction of the lower end plate 6u. Also can be at the bottom Face 2u of the shell body 2, starting from the blind hole 15 a groove be provided, through which the display fuse 13 in the cavity 3 of the Sheath body 2 is guided. From there, the display fusion conductor 13 continues guided along the inner wall of the jacket body 2 to the upper end face 2o, in which also a groove can be provided, from the inside of the Sheath body 2 leads to the bore 14. Then, the display fusion conductor 13 becomes passed over the upper end 10o of the indicator element 10 and on the Sheath body 2 mounted so taut that the indicator element 10 counter held the force of the spring element 11 in the display state "ready" becomes.

For fixing the display fusion conductor 13, a holding element 12 is provided, in a first embodiment as a sleeve with a circumferential collar or flange is formed. This made of brass or aluminum made holding element 12 is dimensioned so that it from above into the hole 14 is pressed and held there by clamping. Before inserting the Retaining element 12 in the bore 14 of the display fuse 13 in the Inserted bore and after mounting of the retaining element 12 by clamping it held.

Thus, the electrical contact between the upper end 13 o of the Display fusion conductor 13 and the upper end plate 6o can also be done, that is Holding member 12 made of an electrically conductive material and in the electrically insulating upper sealing plate 5o a contact element 19 made of copper inserted. About this contact element 19, the holding member 12 is then electrically connected to the upper end plate 6o.

FIG. 2 shows a front view of the jacket body 2 according to FIG For clarity, the contact blades 7o, 7u are not shown. These FIG. 1 shows in particular detail the design of the identification element 10 a central slot 10a at its upper end 10o for receiving and guiding of the display fusion conductor 13. Furthermore, the identification element 10 in Area 2/3 of its length - seen from below - a paragraph 10b, the clamping attachment of the upper end of the spring element 11 Indicator element 10 is used. Also is removable that in a first Mounting step, the holding member 12 with the display fuse 13 in the Bore 14 are pressed, then the previously with the spring element eleventh Connected Kennmelderelement 10 through the holding element 12 in the bore 14th be plugged until the lower end of the spring element 11 to rest on the Paragraph 14a comes. Only by mounting the upper sealing plate 5o is the Kennmelderelement 10 with the spring element 11 against falling out of the Hole 14 secured.

FIG. 3 shows a plan view of the upper end side 2o of a jacket body 2 of the fuse element 1 shown in FIG. This view shows especially clear in the bore 14 for the Kennmelderelement 10, the slot-shaped Training the lower part 14u of the bore 14, which is used to guide the strip-shaped characteristic element 10 is used. Also it can be seen that in the Corner regions of the shell body 2 each in the longitudinal direction extending bores 2b for fastening the sealing plates 5o, 5u and the End plates 6o, 6u are arranged on the jacket body 2.

FIG. 4 shows a plan view of the upper sealing plate 5 o of FIG Securing element 1 of Figure 1 represents. In addition to the holes 17 for the Screwing the sealing plate 5o with the sheath body 2 is also the slit-shaped continuation of the bore 14 in the form of the rectangular opening 5a shown. As described above, the slot-shaped formation allows a Implementation of the Kennmelderelementes 10 and a support thereof Spring element 11. Also adjacent to the opening 5a is rectangular Contact element 19 is shown to electrically connect the display fuse 13 to the upper face plate 6o to connect. The central opening 18 serves to carry out of the contact blade 7o.

In the figure 5 is a plan view of the upper end plate 6o of To see fuse element 1 of Figure 1. Again, the holes 17 for the screw of the face plate 6o shown with the sheath body 2 and the Opening 14b for the implementation of the Kennemderelementes 10. Central is the on see the upper end plate 6o attached upper contact blade 7o. In the area the front side of the upper end plate 6o is closer to the grip tab 8o for the handle shown.

In the figure 6 is a partial enlargement of a side view of a Fuse insert 1 for NH fuses in a second embodiment as well partly shown in section. In essence, this is different Embodiment in the range of the display device 9 shown by the above-described embodiment. For the sake of simplicity, they are all the same Components have been designated by the same reference numerals and in this regard referred to the above description. It can be seen that the Holding element 12 not here as a sleeve with a collar but as u-shaped Staple made of a spring steel strip with a short leg 12a and a long leg 12 b is formed. Just like the sleeve-shaped holding element 12 according to the first embodiment, the U-shaped holding member 12 according to the second embodiment, the task, the upper end 13 o of the Display fusion conductor 13 to be attached to the jacket body 2. This is the Holding member 12 with its U-shaped opening 12c on the between the upper Part 14o of the bore 14 and the front side 2f of the sheath body 2 remaining Bridge 2a of the shell body 2 pushed and held there by clamping. before becomes the upper end 13 o of the display fuse 13 through an opening 12 d in Flange part drawn 12e and into the bore 14 at least the upper part 14o guided (see also Figure 7). The opening 12d in the flange part 12e is located adjacent to the short leg 12a and centrally in the flange part 12e Manufacturing technology, this opening 12d by punching a pin 12f created from the flange 12e, which is then relative to the flange 12e is erected and thus in extension of the short leg 12a extends. This pin 12f replaces the fuse element 1 according to FIG first embodiment known contact element 19, since over the Display fusion conductor 13 electrically with the inside of the upper end plate 6o is connected. FIG. 6 clearly shows that the pin 12f is outside the upper seal plate 5o extends in the direction of the upper end plate 6o and this contacted.

Since the holding member 12 is a U-shaped bracket made of a spring steel strip and Thus, introduced into the bore 14 long leg 12b a flat Has support surface, the upper part 14o of the bore 14 is corresponding customized. Thus, the upper part 14o of the bore 14 has a semicircular Cross-section whose straight part forms the inside of the web 2a. Furthermore can the long leg 12b with respect to the remaining upper part 14o in the Can be let inside the web 2a, so that the spring element 11 itself can not get caught with the long leg 12b. In addition, points at this Embodiment of the upper part 14o of the bore 14 a slight conical Rejuvenation in the direction of paragraph 14a on.

To illustrate the special configuration of the holding element 12 in the Embodiment according to Figure 6, the figure 7 thereof shows a perspective Detailed view. As already described above with reference to FIG bracket-shaped retaining element among others by the pin 12f with the associated Opening 12d off. In addition, at the lower end of the long leg 12b formed claw 12g pointing inwards to the opening 12c, via which the hold of the Retaining element 12 in the bore 14 is improved. In the installed state of Holding element 12 thus grip the claws 12g in the inner wall of the flat part There may also be two more claws at the bottom of the short Leg 12a are provided.

FIG. 8 shows a plan view of the jacket body 2 of the fuse link 1 shown in FIG. This figure is particularly clear the semicircular Cross section of the bore 14 to remove. Also, the recess 14c for the long leg 12b of the retaining element 12 in the straight wall of the to recognize semicircular bore 14.

FIG. 9 shows a side view of a fuse link 1 for NH fuses in a third embodiment. This third embodiment is a Modification of the previously described second embodiment, which is in Essentially in the manner of attachment of the spring element 11 to the Identifier element 10 differs. In terms of the other components is on the above description of the first and second embodiments taken. For fastening the spring element 11 to the rod-shaped Indicator element 10 has this an obliquely downwardly directed pin 10b on, which projects into the opening of the helical spring element 11. The Spring element 11 is thus seen in the longitudinal direction of the bore 14 laterally beside the Kennmelderelement 10 and with respect to the sheath body 2 inwards staggered. The pin 10b also prevents that when mounted upper Seal and face plate 5o, 6o the indicator element 10 in the display state "triggered" the hole 14 can leave.

Finally, FIG. 10 shows a top view of the jacket body 2 of FIG Fuse insert 1 according to Figure 9. It is clear that the lower part 14u of the bore 14 with respect to the upper part 14o offset to the web 2a is, so that the web 2a facing inner walls of the upper part 14o and of the lower part 14u with the exception of a possible recess for the long Legs 12b of the holding element 12c are aligned with each other.

FIG. 11 shows a side view of a fuse-link 101 for NH fuses in a further embodiment partially in section. Of the Fuse link 101 consists essentially of a tubular Sheath body 102 of steatite having a rectangular cross section, the one Cavity 103 limited for a working conductor 104. The between the centrally located in the shell body 102 working melt conductor 104 and the Inner wall of the shell body 102 remaining cavity 103 is with extinguishing sand refilled.

The upper and lower end of the sheath body 102 is upper Gasket plate 105o and a lower seal plate 105u closed. The Sealing plates 105o, 105u are made of an electrically insulating material, such as For example, Prespan or felt produced and have a size that about coincide with the outer dimensions of the shell body 102. To the two Sealing plates 105o, 105u close each an upper and a lower Face plate 106o, 106u on, the flat on the sealing plates 105o. 105u rest. The two end plates 106o, 106u are made of aluminum. Corresponding the rectangular cross-section of the shell body 102 are the flat Sealing plates 105o, 105u and the end plates 106o, 106u also rectangular. The sealing plates 105o, 105u and the end plates 106o, 106u are fastened on the shell body 102 via screws 119, whose shafts in the shell body 102 find support in corresponding bores, not shown. Usually way are each end plate 106o, 106u provided four screws, each in the Corner regions of the end plates 106o, 106u are arranged. At the end plates 106o, 106u are each a contact blade 107o, 107u by caulking or Attached upsetting, which is electrically connected to the working flux conductor 104. The contact blades 107o, 107u have essentially the function, the Fuse 101 in resilient retaining clips of a not shown Fasten fuse housing releasably and at the same time electrically with the To connect retaining clips. To handle the To facilitate fuse link 101, the end plates 106o, 106u on the Sheath body 102 also extends out to the front of the fuse link 101 and thus form grip tabs 108o, 108u to which a conventional one does not shown handle can be attached.

Furthermore, FIG. 11 shows that the working smelting conductor 104 has a Display device 109 is assigned, via which the state - "ready" or "triggered" - from the upper end and the front of the fuse link 101 can be read. The display device 109 consists essentially from a characteristic element 110, a spring element 111, a Guide element 112 and a display fuse 113. On the basis of Indicator element 110 allows an operator to view the status of the fuse link 101 visually recognize. In FIG. 11, the indicator element 110 is in the Display state "ready for operation". The detail enlargement according to FIG. 13 shows the display state "triggered". The indicator element 110 is as Longitudinal strips formed an Alubandrolle and over its entire length one or red anodized on both sides so that it can be easily recognized by the operator. In addition, the indicator element 110 is angularly formed with a short leg 110a and a long leg 110b. The short leg 110a and the long leg 110b are preferably perpendicular to each other arranged.

To the indicator element 110 between its two display states to be able to move defined, the long leg 110 b in a guide groove 114 guided. FIG. 11 clearly shows that the guide groove 114 in the front side 2f of the Sheath body 102 is arranged and parallel to the longitudinal direction of the sheath body 102 is aligned. The guide groove 114 extends from the upper end side of the shell body 102 beyond its center and has a total length of about 2/3 of the length of the shell body 102. To form a channel for safe Guide of the long leg 110b is the guide groove 114 with a front panel 115 closed, which is approximately the entire front side 102f of the shell body 102nd covers. The front panel 115 is made of plastic and has approximately in the middle and thus in the region of the lower end of the guide groove 114 a viewing opening 116 for the operator. The front panel 115 is on the front side 102 f of Sheath body 102 glued. Is in the viewing port 116, the red Kennmelderelement 110 and its red end region seen is the fuse element 101 is ready for use; if it is not seen, it is long Leg 110b of the Kennmelderelementes 110 up in the guide 114th moved and the fuse element 101 triggered.

Furthermore, this guide groove 114 is rectangular in cross-section and is starting from the upper end face 102o of the jacket body 102 in FIG Direction whose lower end is wedge-shaped tapered. In the area of the lower end, the height of the wedge-shaped guide groove 114 is slightly larger than the thickness of the Kennmelderelementes 114. Thus, it is ensured that the Identifier element 110 in the guide 114 can not rotate and safe is guided.

The indicator element 110 is with its long leg 110b from above through an opening 106a (see Figure 3) inserted into the guide groove 114 and between the display positions "ready" and "triggered" in the longitudinal direction of Sheath body 102 displaced. So that the indicator element 110th or its long leg 110b, the guide groove 114 in Display state "triggered" can not leave is at the the jacket body 102nd facing side of the long leg 110b is approximately at right angles to Longitudinal extension of the long leg 110b extending web-like projection 110c provided. In the display state "triggered" this is supported Indicator element 110 with its projection 110c on the inside of the upper End plate 106o in the region of the opening 106a from. Accordingly, the Dimensions of provided in the upper end plate 106o opening 106a for the leadership of Kennmelderelementes 110, to the outer contour of the Identifier element 110 adapted; the protrusion 110c may be the opening 6a not happen. In addition, the projection 110c is limited resilient formed so that this during assembly of the long leg 110b of the Identifier element 110 through the opening 106a in the upper end plate 106o easily rests against the long leg 110b of the indicator element 110 and after passing through the opening 106a jumps back and serves as a stop.

The display melting conductor 113 has the task that identification element 110 in the display state "ready" against the voltage of the spring element 111th as long as the display fuse 113 in response to the Fuse is not melted through. For this is the Display fusion conductor 113 electrically parallel to the working fusible link 104 connected. Accordingly, the ends of the display fusion conductor 113 are electrically connected to the upper and lower end plates 106o, 106u. Of the Display fuse 113 is a wire made of nickel. The lower End 113u of the display fusion conductor 113 is defined by a sand hole 121 in FIG lower end plate 106u for filling the extinguishing sand in the sheath body 102nd led to the outside and there is a sand plug 117 for closing the Sand hole 121 pinched. The sand hole 121 is in the usual way as circular bore formed, which is parallel to the longitudinal extent of the Sheath body 102 extends. The sand plug 117 is made of brass or aluminum manufactured and dimensioned so that this from below into the sand hole 121 is pressed and held there clamped.

Thus, the lower end 113u of the display fusion conductor 113 is lower Face plate 106u connected. Starting from the sand plug 117 runs the Display fusion conductor 113 through the erosion-filled cavity 103 of the Sheath body 102 into the region of another opening 118 (see Figure 13) in the upper face plate 106o. This opening 118 is the sand hole 121 in the lower Face plate 106u arranged opposite one another and with a guide element 112nd closed for the display melting 113. In addition, this opening 118 is in customary manner designed as a circular bore, which is parallel to the Longitudinal extent of the sheath body 102 extends. The guide element 112 is as a sleeve-shaped plug with a circumferential collar or Flange formed centrally in its slightly conical bottom in the area the outer tip a hole 112a for the implementation of the display semiconductor 113 has. This guide member 112 is made of brass or aluminum and dimensioned so that it is pressed from above into the opening 118 and there is held clamped.

The guide member 112 is adjacent to the central guide of Display melting conductor 113 also a helical spring element 111th whose lower end is at the bottom of the guide element 112 supported and loosely there. The upper end of the spring element 111 abuts the underside of the short leg 110 a of the Kennmelderelementes 110 and is there with its winding end over manifestations in the short leg 110a of the indicator element 110 on the short leg 110a of the Identifier element 110 attached. The spring element 111 is thus captive between the short leg 110 a of the Kennmelderelementes 110 and the Guide element 112 clamped. About the spring element 111 is the Identifier element 110 from its display state "ready" in the Display state "triggered" movable. For this purpose, the spring element 111 in the Assembled mounting of Kennmelderelementes 110 and is located in his preloaded state almost completely or completely within of the guide element 112. In this preloaded state - display state "ready for use" - is Kennmelderelement 110 or the spring element 111 against the force of the spring element 111 via the corresponding biased indicator fuse 113 held. The upper end 113o of the Display fusion conductor 113 is clamped to the leg 110a of the Identifier element 110 connected via characteristics.

The electrical contact between the upper end 113 o of the Display melting conductor 113 and the upper end plate 106o is done either directly via the contact of the display melt conductor 113 with the guide element 112 in FIG the hole 112a or via its contact with the short leg 110a of the Identifier element 110, via the spring element 111 and the Guide member 112 is electrically connected to the upper end plate 106o.

FIG. 12 shows a front view of the fuse link 102 according to FIG. 11 with his contact knives 107o, 107u. Also hinted is that of the Sheath body 102 as seen from the outside open guide 114 for the long leg 110b to recognize by dashed lines. Approximately in the middle of the front panel 116 - seen in the longitudinal direction of the sheath body 102 - is the viewing opening for the indicator element 110 is arranged. In addition, the screws 119 to Fixing the upper and lower end plate 106o, 106u on the front sides of the Sheath body 102 to recognize.

FIG. 13 shows an enlarged detail of the securing element 101 11 shows from the area of the indicator element 110. These View shows particularly clearly the operation of the Kennmelderelementes 110th The indicator element 110 is shown in its display state "triggered", that is, the display fuse 113 is in parallel with the working fuse 104 melted. The display fuse 113 has - as previously described - The task, the indicator element 110 against the force of Spring element 111 in the display state "ready" to keep. This is the upper end 113o of the Kennmelderelementes 110 at the bottom of the short Leg 110a of Kennmelderelementes 110 attached and tensions this against the force of the spring element 111 so that the underside of the short Leg 110a of Kennmelderelementes 110 on the flange of the Guide element 112 and the top of the upper end plate 106o rests. Now that the indicator fusible conductor 113 has melted through, this has Spring element 111, which in the compressed state almost completely in the sleeve-shaped guide member 112 rests, relaxes. This is the result Identifier element 110 in the longitudinal direction of the jacket body 102 so far upwards has been shifted until the web-like projection 110c of the Kennmelderelementes 110 comes from below at the upper end plate 106o to the plant. By doing Display state "triggered" is thus the short leg 110a from the top Front plate 106o lifted so that the front side of the triggering state of the Fuse element 101 can be clearly recognized. Since now the long Leg 110b of Kennmelderelementes 110 in the longitudinal direction of the jacket body 102 is shifted upward, has the lower mostly colored end of the long Leg 110b of the Kennmelderelementes 110, the lower portion of the Leave guide channel 114 and thus the front view port 116 free given.

Furthermore, FIG. 13 shows that the opening 106a in the upper end plate Although 106o has a sufficient size to the long leg 110b of the Identifier element 110 including the spring-back projection 110 at mounted upper face plate 106o in the guide channel 114 introduce. Of the Projection 110 can thus no longer "triggered" in the display state from the Slide guide channel 114 upwards and thus serves as a stop. In Advantageously, the spring element 112, the indicator element 110th and the display fusion conductor 113 are pre-assembled. After mounting the Identifier element 110, in particular the insertion of the long leg 110b of the Kennmelderelementes 110 in the guide channel 114, the Indicator fusible conductor 113 through the hole 112a in the bottom of the guide member Threaded 112, passed through the interior of the shell body 102 and the opposite sand hole 121 brought out. First, the Display fusible conductor 113 attached to the lower handle tab 108u to Backfilling the shell body 102 with sand over the sand plug 117 clamping to be attached.

LIST OF REFERENCE NUMBERS

1

fuse link

2

covering body

2a

web

2 B

drilling

2f

front

2o

upper end side

2u

lower front side

3

cavity

4

Working fuse element

5a

opening

5o

upper sealing plate

5u

lower seal plate

6o

upper face plate

6u

lower face plate

7o

upper contact blade

7u

lower contact knife

8o

upper grip tab

8u

lower grip tab

9

display device

10

Characteristic detector element

10a

slot

10b

paragraph

10o

top end

11

spring element

12

retaining element

12a

short thigh

12b

long thigh

12c

opening

12d

opening

12e

flange

12f

pen

12g

claw

13

Indicating fuse element

13o

top end

13u

lower end

14

drilling

14a

paragraph

14b

opening

14o

upper part

14u

lower part

15

blind

16

second spring element

17

drilling

18

opening

19

contact element

20

Querkanal

21

Sandloch

101

fuse link

102

covering body

102f

front

103

cavity

104

Working fuse element

105o

upper sealing plate

105u

lower seal plate

106a

opening

106o

upper face plate

106u

lower face plate

107o

upper contact blade

107U

lower contact knife

108o

upper grip tab

108u

lower grip tab

109

display device

110

Characteristic detector element

110a

short thigh

110b

long thigh

110c

head Start

111

spring element

112

guide element

112a

hole

113

Indicating fuse element

end surface 113 o

top end

113u

lower end

114

guide

115

front panel

116

view port

117

sand plug

118

opening

119

screw

121

Sandloch

Claims (20)

Electric fuse link, in particular for a low-voltage high-performance fuse, with a working-type conductor (4, 104) arranged in a tubular jacket body (2, 102) and with a display device (9, 109) for indicating the operating states "ready" and "triggered" of the fuse link (1, 101), comprising an indicator melting conductor (13, 113) connected electrically parallel to the working fuse conductor (4, 104) and an indicator element (10, 110) connected to a spring element (11, 111) for optically displaying the operating states , which is held by the indicator fusible conductor (4, 104) in the operating state "operative" under tension of the spring element (11, 111),
characterized in that the display melting conductor (13, 113) with one end (13o, 113o) in the region of the characteristic element (10, 110) is clamped to the casing body (2, 102) or clamped to the identification element (10, 110). Electric fuse link according to claim 1, characterized in that the indicator melting conductor (13, 113) is wire-shaped and acts directly on the upper end (10o, 110o) of the indicator element (10, 110). Electric fuse link according to claim 1 or 2, characterized in that the spring element (11, 111) is designed as a helical spring. Electric fuse link according to one of claims 1 to 3, characterized in that the display melting conductor (13) with the end (13o) in the region of the characteristic element (10) via a holding element (12) is clamped to the jacket body (2). Electric fuse link according to claim 4, characterized in that the spring element (11) in the wall of the jacket body (2) is arranged. Electric fuse link according to claim 5, characterized in that the spring element (11) is supported in the jacket body (2) and outside the ends (10o) of the Kennmelderelementes (10) is attached to the indicator element (10). Electrical fuse link according to one of claims 4 to 6, characterized in that the characteristic element (10) is rod-shaped, slidably disposed in a bore (14) of the jacket body (2) between the operating states "ready" and "triggered" and in the operating state "triggered" from the end face (2o) of the jacket body (2) protrudes. Electric fuse link according to claim 7, characterized in that it is sleeve-shaped, the holding element (12) is inserted into the opening of the bore (14) and the upper end (13o) of the display melt conductor (13) between the holding element (12) and the bore (14) is trapped. Electrical fuse link according to claim 7, characterized in that the holding element (12) is designed as a U-shaped clamp, which is inserted with a leg (12a, 12b) in the opening of the bore (14) and the upper end (13o) of the Display melting conductor (13) between the holding element (12) and the bore (14) is clamped. Electric fuse link according to one of claims 4 to 9, characterized in that the spring element (11) is aligned with its force action direction parallel to the longitudinal extension of the guide element (12). Electric fuse link according to claim 4, characterized in that the display melting conductor (113) via a sleeve-shaped guide element (112) out of the sheath body (102) is led out. Electric fuse link according to claim 11, characterized in that the spring element (111) in the operating state "ready for operation" is arranged almost completely in the guide element (112). An electric fuse link according to claim 11 or 12, characterized in that the spring element (111) is supported in the guide element (112) and its end remote from the guide element (112) is connected to the indicator element (110). Electric fuse link according to one of claims 11 to 13, characterized in that the sleeve-shaped guide element (112) in the manner of a plug in an opening (118) of the jacket body (102) adjacent end plate (106o) is inserted and the opening of the guide element ( 112) is directed away from the sheath body (102). An electric fuse link according to any one of claims 11 to 14, characterized in that the indicator element (110) is angularly formed with a short leg (110a) and a long leg (110b), the long leg (110b) in a guide channel (114) in Front side (102f) of the sheath body (102) between the operating conditions "ready" and "triggered" is slidably disposed and in the operating state "triggered" protrudes from the end face of the sheath body (102). Electric fuse link according to claim 15, characterized in that the guide channel (114) in the front side (102f) of the sheath body (102) via a on the front side (102f) of the sheath body (102) arranged front plate (115) is closed to the outside. Electrical fuse link according to claim 15 or 16, characterized in that the spring element (111) with its direction of force parallel and laterally offset from the direction of displacement of the long leg (110a) of the indicator element (110) is aligned. Electrical fuse link according to one of claims 11 to 17, characterized in that the upper end (113o) of the display melting conductor (113) is directly connected to the short leg (110a) of the Kennemderelementes (110). Electric fuse link according to one of claims 1 to 18, characterized in that of the display device (9, 109), in particular of the indicator element (10, 110), the operating state of the fuse link (1, 101) on the front side and on the front side thereof can be displayed is. Electric fuse link according to one of claims 1 to 19, characterized in that the identification element (10, 110) is designed as a red anodized aluminum strip.

Images