DE19644026A1 - Electrical fuse element and method for its production - Google Patents

Abstract

The present invention relates to an electrical fuse element (1) having a substantially ceramic housing and a fusible conductor (3, 4) and to a process for its production. All known fuses of the said type have problems in mass production, in particular in the fixing and fastening of their fusible conductors. The object is therefore to provide a fuse and a process for its production which simplifies the fixing and fastening of fusible conductors and altogether brings about a reduction in cost in comparison with known processes. The object is achieved according to the invention in that a fusible conductor (3, 4) is placed between two green ceramic layers (2, 5) in such a way that it runs at least between mutually opposite end faces of the ceramic layers (2, 5) and this arrangement is pressed and subsequently sintered.

Description

The present invention relates to an electrical security tion element with an essentially ceramic housing and a process for its manufacture.

Security elements of the type mentioned are in large numbers in electrical circuits as protection against excessive currents built-in. Your area of application extends from the weak current range up to the range of higher voltage levels a. Such fuses are used in low-voltage circuits especially as SMD-equipped chip fuses with very small dimensions used. When used in higher These fuses are particularly characterized by voltage levels through the resilience of their ceramic housing against high temperatures and strong mechanical bean sayings.

Together, all backups of the type mentioned have problems in mass production, especially when fixing and loading consolidate their fusible conductors.

There is therefore the task of a backup and a procedure to create their manufacture, the fixation and loading consolidate fusible conductors simplified and thereby a Ver Approval over known methods.

The object is achieved in that

• - A fuse element like this
• - is placed between two green ceramic layers,
• - that it is at least between opposite one another End edges of the ceramic layers run and
• - This arrangement presses and
• - is then sintered.

In the context of this invention, unfired, flexible Kera microfoils, including green tape or low temperature cofiring cera called mic, commonly referred to as green ceramic layers net.

In a method according to the invention, the property green ceramic layers, under the influence of pressure to glue another, used to stick one between two green ones To enclose ceramic layers placed fuse element. To the fuse element is simply over a green ceramic layer placed and covered by a second green ceramic layer. These green ceramic layers are deformable within limits and therefore enclose the fuse element when the Arrangement by being in contact with the enamel deform the conductor accordingly. The fuse element is so in its position fixed and held securely. Furthermore arises from bonding the layers a hermetic and after the Sintering permanent sealing of the fuse element against the Surroundings. At the same time, the green ceramic layers in the sintering step as a one-piece ceramic housing without the aid of other auxiliaries, such as. B. glue, ver consolidates. This homogeneous outer body is its own known in terms of strength and tightness Housing designs at least equal.

In an essential further development, the arrangement in an intermediate step in a tempered environment, for example in a heating press or an isostatic Press. Warming further softens the green layers. Under the influence of pressure and temperature the above-described gluing of green layers in the Contact area with each other to an irreversible connection trained between adjacent layers, each type of the transition or boundary layer completely disappears. It arises, in contrast to untempered pressing, instead surface adhesion or adhesion is now a homogeneous one Body with complete dissolution of the former surface  borders. This body is also called laminate. Furthermore, this process step of drying the solution medium green layers as a preliminary stage for sintering the nen.

The arrangement is advantageously in the region of End faces on which the fusible conductors are located, metal lized. This will make external contacts for the electrical Access of the fuse element created, preferably by opening wear, dry and then sinter a paste. In order to then external contacts are already applied and the safe Rungselement is ready for installation z. B. in an SMD scarf tung.

According to claim 4, a green is at least on the surface NEN ceramic layer in contact with the fuse element comes, conductive paste in the opposite areas applied. These areas are at a distance from each other other, which is determined by the dimensions of the component is, preferably in the edge areas at the points applied to which the contacts are finally applied will. Without this measure, the external contact opens directly in the fuse element with its comparatively low Diameter. So already in the area of External contacts of the fuse element have very high current densities arise that trigger the fuse outside the egg possible security body can lead.

The paste is preferably applied in strip form in order to the contactable cross section of the fuse element to the outside effectively increase and thus the current density at the on finally lower. The application is also in this form the paste particularly easy to perform, for example in Form of a material-saving screen printing process. So can overall be ensured that the melting at Tripped in the middle of the fuse. The one with the scarf The pressure generated by the securing element takes this  closed ceramic housing so that no metallic Vapors can escape. Even when triggered Arcing occurs never from the fuse element out to the environment.

In a further development, the fuse element is made out of wire leads. A wire is characterized by its material composition, its cross-sectional area and its length in general Description of the behavior of an electrical circuit exactly determined enough. According to the wire in the be written, sandwich-like securing element performed in a certain form. So in production Elements are produced, the triggering properties in a narrowly limited interval, because within a each fuse element always the same, defined There are environmental influences for the fuse element. Ferti From an engineering point of view, it has proven useful to use the wire when building the Securing element in a straight line between the green ones Ceramic layers to draw, or when assembling between the To stretch layers. After that described in claim 2 The lamination step is then through the wire laminate itself consisting of at least two ceramic layers worn and fixed in position.

Advantageously, a filler can also be between the green ceramic foils inlaid or inserted and one-sided be kidneyed, e.g. B. to influence the switch-off behavior of the securing element. For this, the filling material can be placed on or arranged above the fuse element and with the upper green Ceramic foil to be covered. At the center of the arrangement can a thickening occurs by inserting the filling material hen. This can be taken into account when laminating that an isostatic press is used. Furthermore, a conventional press can be one of the structure of the laminating securing element correspondingly profiled Have press plate. In both cases a laminate can be used the properties mentioned above are produced.  

In an essential further training, at least one of the green ceramic layers before inserting the fuse element in the Perforated area of the central axis. After laminating the Si securing element is thus at least one open half space the central axis of the arrangement. The for the Fuse or the triggering behavior of the fuse essential Parameters are in this free, openly accessible from the outside Half space can now be defined appropriately by the user.

This open, air-filled half space can be a ceramic Half space on the other side of the fuse element opposite lie. Now runs the fuse element at the border between these two half-spaces, the securing element in its shutdown properties by designing the free, here only air-filled half-space can be influenced on one side. According to the invention, the perforation is in the central region of the Si cherungseses arranged through which the fuse element in every case is running. In the selected area of the backup elementes experience the highest temperatures during operation on what makes each one stand out through a material change called variation of the environmental properties down maximum impact switching properties of the fuse element can.

In both, the fusible conductor is advantageously reversed the ceramic layers of holes are arranged one above the other net. This means that two half-spaces are available in the area of the perforation Available at the limit of which the fuse element runs. The Half spaces can vary depending on the choice of filler materials have different material parameters that can be decoupled. However, both half spaces can be of the same kind with the same Material are filled so that the fuse element also in Area of the perforation passes through a homogeneous space. The Ver The half-spaces can be filled through the use of solid media be made in one piece, for example by prefabricated Moldings that also partially enclose the fuse element can. The technical version here is a pill-shaped,  green sintered body with a groove to absorb the enamel called leader.

However, backfilling with flowable Me is preferred serve, for example by pastes. By backfilling the fuse element is mechanically supported, so that the safe tion element as a whole is also insusceptible to vibrations. Furthermore, a paste-like filling compound and another flowable medium with the inner wall of the perforation optimal connect so that no further connection measures or Fastenings must be taken.

In a further development, a perforation is made by an external other green ceramic layer covered. After the lami In this way, a defined space with a given geometry is created generated, which is sealed gas-tight at the end. So that is the fuse element mechanically and against environmental influences safely protected. This closed arrangement also shows the advantage that now even flowable or pourable filling materials that do not solidify can be used let or to maintain their material properties must be protected from the environment. For example can be punched in one or both sides order through the cover with an additional ceramic layer through the filling of the defined cavity fine quartz sand or aluminum oxide powder.

Advantageously, in the method according to the invention for the construction and manufacture of a securing element geo metrically identical shaped ceramic layers can be used. This reduces the manufacturing effort in the steps before assembling the securing element or the laminate limited. However, the method according to the invention leaves also the use of differently shaped ceramic layers to build specially shaped ceramic bodies. One below right and a covering, upper ceramic layer with in between arranged fuse element can be dimensioned so that the  for example, the upper ceramic layer is narrower than the lower one Ceramic layer may be formed so that the upper ceramic layer opposite the lower ceramic layer at the end edges jumps back. This change in geometry can, for example wise larger contact areas on the end sides become, or be changed in their form decisively. So z. B. Connections exposed for installing the fuse element as a composite fuse element in a fuse housing, as will be explained using an exemplary embodiment.

In a further development, the ceramic layers can also Have vias at any point. This Vias can be filled or unfilled and thus open up possibilities for a different type of fastening gung, contacting or use of the fuse element.

A fuse element according to the invention is directly as an SMD component applicable. It can also be used as a Kombina fuse element in existing fuse housings fuse types with new switching devices to form. Advantageously, safety elements elements as a combination fuse element with a special inside Ren construction used in known fuse boxes will. For example, the attachment and contacting of a fuse element to the in the fixed IEC standard grid of outer voltage according to the respective voltage level Contact legs analogous to the assembly of a printed circuit board with SMD components.

The additional housing serves to encapsulate the Arrangement so that even when the fuse element bursts no fragments to the outside when the fuse is triggered can be long. Further thermal insulation also occurs of the securing element. In this way, further test writings through an international certification such a backup can be fulfilled more easily.  

For examples, see the description at this point preferred embodiments of the invention.

A securing element according to the invention is so far with all described process steps in a mass production process can be produced in multiple uses. There are also green Kera microlayers with a size that are multiple corresponds to the size of a single securing element. At the same time, several fusible conductors are arranged and through at least an upper ceramic layer at least partially covered as described above. After the laminie ren, the pressing of the arrangement under an increased reverse training temperature, then a separation of the Si securing elements by cutting, breaking or sawing gene, since the arrangement is sufficient in this condition is fixed.

For orders with a thickness of more than two Kera microlayers are preferred, separation after the lami kidneys. However, it is also possible to use the endver consolidated arrangement with finished, ceramic outer body the sintering by breaking or sawing.

Exemplary embodiments of the invention are described below the drawings explained in more detail. The pictures show:

Fig. 1a is a perspective view of some assembly steps for the manufacture of a fuse element;

Fig. 1b is a perspective view of the assembled fuse element of Fig. 1a;

Fig. 1c is a perspective view of the provided with Kontakt th securing element;

Fig. 2a is a perspective view of some assembly steps for the manufacture of the Sicherheitsele element of Fig. 1a;

Fig. 2b is a perspective view of the assembled fuse element of Fig. 2a;

Figure 2c is a perspective view of the fuse element of Figure 2b with backfill.

Fig. 2d is a perspective view of the finished fuse element;

Fig. 3a-3c perspective views of the assembly of a further embodiment of a fuse element in an analogous sequence to Figures 1a-1c.

Fig. 4 is a perspective view of some manufacturing steps for producing an alternative embodiment of the securing element of Figure 1 in multiple use.

Fig. 5 is a perspective view of some produc- tion steps for the production of the execution form of the fuse element of Figure 1 in the multiple use;

Fig. 6a is a perspective view of some produc- tion steps for the production of the further imple mentation form of the securing element of Figure 1 in multiple use.

Fig. 6b is an illustration of the laminated arrangement of Fig. 6a as an intermediate and

Fig. 7a, 7b sketches of the installation of a fuse element of the embodiment of Fig. 6b as an SMD component in standardized or widely used housings.

Fig. 1 is a perspective view showing the assembly of a fuse element 1. In a first step, two layers 3 are applied to a lower, flat, green ceramic layer 2 a with a paste 3 a, which adjoin the end faces 4 of the lower ceramic layer 2 a. Between these paste layers 3 , a fusible conductor 5 in the form of a wire 6 is drawn and placed on the surface 3 b. The paste layer 3 thus increases the contact area of the thin wire 6 to the outside, whereby the current density at the subsequent connection to the wire is reduced. The hottest point in the arrangement has thus been optimally moved to the center. This means that the wire 6 always melts in the middle of the securing element 1 .

The wire 6 is then covered by an upper green ceramic layer 2 b. The arrangement 7 thus created is heated to about 70 ° C. in a subsequent process step and thus softens, as a result of which the upper green ceramic layer 2 b is inseparably bonded to the lower green ceramic layer 2 a. This connection is supported by a pressing process running parallel to the heating, in which the arrangement 7 is pressed together. This step is also called lamination.

At the same time, the arrangement 7 can be predried, since at the temperatures mentioned, at least some of the solvents contained escape from the green layers 2 . This results in a pre-consolidated, uniform body.

Fig. 1b shows a perspective view of the fuse element of Fig. 1a assembled so far after the wire 6 has been severed to the end faces 4 of the arrangement 7 . On the end faces 4 , the very small cross section of the fusible conductor 6 can be seen , as it is tightly enclosed by two end edges 4 a of the end faces 4 . The pressed and pre-dried arrangement 7 has a certain strength in this state, although the ceramic layers 2 a, 2 b connected to one another by self-adhesive have not yet been sintered to form a solid outer ceramic body 8 . However, this body 8 already exists in this unsintered state as a unit, the line 9 has only been included in the sketch for the sake of clarity and for orientation of the viewer as a marking of the former border between the two green layers 2 .

Fig. 1c shows a sketch of the fuse element 1 provided with contacts 10 of Fig. 1b. The arrangement has been dipped with the end faces 4 in a conductive paste 11 . In addition to the tiny end face of the wire 6 , the paste layer 3 has come into contact with the conductive paste 11 with the part up to the end edge 4 a. After the sintering of the conductive paste 11 , this process step produces the contact 11 , which is easily electrically accessible from the outside, and moreover also solderable, and is conductively connected to the wire 6 . The actual course of the wire 6 between the ceramic layers 2 is generally freely selectable by the chosen type of contact. In the present example, a firmly defined course has been chosen along a central axis 12 of the arrangement 7 . But it is also conceivable to guide the wire 6, for example, diagonally across the surface 3 b of the ceramic layers 2 , in order, for. B. with a fixed geometry of the outer ceramic body 8 to increase the length of the wire 6 .

Overall, the described method results in an arrangement 7 , in the electrically conductive part of which a current density curve is established which always reaches its maximum value only in the pressure-tight, protected interior of the ceramic body 8 and accordingly will only blow at one point in the middle of the wire 6 . At this point, all material parameters can be defined in a wide range by constructive measures, such as by inserting a molded body that covers the fuse element and is subsequently covered and closed by the upper ceramic layer. Further preferred possibilities are explained in the following with the aid of further exemplary embodiments.

Fig. 2a is a perspective view of some assembly steps for the manufacture of the securing element 1 of Fig. 1a, but now there is a hole 13 in the middle of the obe ren green ceramic layer 2 b. The assembly takes place in the manner described with reference to FIGS. 1a-1c. Through the perforation 13 of the ver running along the central axis 12 wire 6 is now in an essential for determining the shutdown behavior of the fuse element 1 not closed by the later closed outer ceramic body 8 . In the open area, the wire 6 is the warmest in operation. Here it will also be cut when the fuse element is triggered. The opening of the Keramikkör pers 8 gives the possibility, through the choice of a suitable cover or a mass 14 with which this perforation is closed over the wire 6 , to vary the switch-off behavior of the hedging element 1 decisively. The aging behavior of the fuse can also be changed. For this purpose, viscous potting compounds are added, for example ceramic pastes, which are solidified in the course of the manufacturing process. However, self-hardening substances can also be used as long as they have a positive effect on the switch-off behavior, for example through the irreversible absorption of hot gases from an arc at the switch-off instant. By including small cavities in the area of the perforations 13 , pressure equalization spaces can also be created near the wire 6 , which can simultaneously increase the thermal insulation of the wire 6 .

Fig. 2b is a perspective view of the assembled securing element of FIG. 2a, b in which the through hole 13 of the upper ceramic layer 2 is clearly visible in the arrangement of exposed wire 6. Line 9 as a marking of the former boundary layer between the ceramic layers 2 a, 2 b has again been drawn in only for orientation.

Fig. 2c shows a perspective view of the securing element of Fig. 2b after the filling of the perforation 13 by a mass 14 , which ends plan with the surface 3 b of the upper ceramic layer 2 b. For reasons of the pressure resistance of the cover, the thickness of the mass 14 over the wire 6 should not be chosen too low. So it should always be noted in the pictures described that the portrayed ceramic layers 2 themselves have very small layer thicknesses. When selecting the mass 14 , it should also be noted that arc-quenching properties of the mass are desirable. Under no circumstances should the mass support the burning under the influence of an arc, for example by forming conductive carbon bridges.

Fig. 2d is a perspective view of the finished fuse element 1 after application of the contacts 10 at the end faces 4 of the assembly 7. The different structure of the securing element 1 can be seen from FIG. 2d in comparison with FIG. 1c through the perforation 13 in the middle of the element which is closed by the mass 14 . The securing element 1 shown could be produced as an SMD component with very small dimensions, so that the mass 14 can be used to identify the component properties. This can be done by the outer shape of the cover above the upper ceramic layer 2 b or by coloring the mass 14 , to name just a few examples.

The method illustrated in FIGS. 2a-2d is also applicable in the production of fuse elements in which perforations 13 in the middle of both ceramic layers 2 a, 2 b a are brought, whereby the switching capacity or the turn-off of the fuse element 1 even more be influenceable, since the wire 6 is in its most heated area in this case in a homogeneous material.

There is often a need in the manufacture of electrical fuses, even with the smallest geometric dimensions, to let the fusible conductor run through media which, although pourable, cannot be cured. An example of this is fine quartz sand. There are also examples of filling materials that need to be protected against environmental influences. FIGS. 3a-3c are perspective views showing a development of the in FIGS. 2a-2d shown Her approval procedure for the creation of another execution form of a fuse element for the said applications. The wire 6 is surrounded by an upper and lower green ceramic layer 2 a, 2 b, each of which has a perforation 13 in its central region, which in the assembled state come to lie one above the other analogous to FIG. 2a. The construction and assembly takes place in the manner shown in FIGS. 1a-1c. This arrangement is complemented by two outer green ceramic layers 2 c, the holes 13 abdec ken, so that a cavity or a cavity with defined dimensions has formed in the interior of the arrangement 7 .

Before applying the outer green ceramic layer 2 c arranged above, it is possible in an intermediate step (not shown) to fill this cavity with wire 6 passing through with a mass 14 . The sealing and lamination then follows. With or without filling the cavity, an arrangement 7 results, as shown in FIG. 3b, after lamination. Lines 9 represent the former interfaces, which are no longer visible in reality, between the green ceramic layers which are stacked and glued and pressed together. The application of outer contacts 10 is carried out analogously to the manner described for FIG. 1c.

The manufacture of the described embodiments can hen instead of a one-off production rationally in multiple uses. Fig. 4 shows a perspective view of some manufacturing steps for producing an alternative embodiment of the securing element of FIGS . 1a-1c. The securing element shown here would consist in the finished state of a wire 6 which runs through an outer ceramic body 8 and is electrically accessible from the outside at the end faces 4 via contacts 10 . An adaptation of the contactable cross-section from the wire 6 to the contacts 10 as in Fig. 1a-1c is not provided in this case.

This simple fuse can be produced in large numbers by stretching a large number of parallel wires 6 at a defined distance from one another on a large lower ceramic layer 2 b and then covering it with an upper ceramic layer, the upper and lower ceramic layers 2 a, 2 b have the same dimensions. After the lamination, the protruding ends of the wires 6 can be shortened. The wires are now held and fixed by the outer body 8 . After sintering the arrangement, a body is formed from which 25 securing elements could be obtained by separating in the present case. The separation could be done by breaking or sawing. The separation can be facilitated by applying impressions 15 or depressions 16 or grooves 17 to the arrangement during the lamination process. The grid 18 shown in FIG. 4 from lines 19 has only been included in the drawing 4 to illustrate the isolation or as an example display for the later course of recesses 16 or grooves 17 . Such a grid 18 will only be visible in the manufacturing process after lamination. In addition to facilitating the separation by breaking, recesses 16 can also be used to identify the securing element as an electrical construction element or to indicate the properties, for example by pressing letters or characters as recess 16 in each component.

FIG. 5 shows some manufacturing steps of the method for producing securing elements 1 of the embodiment of FIGS. 1a-1c, which is expanded compared to FIG. 4. Here layers 3 with paste 3 a were applied to the lower green ceramic layer 2 a at a predetermined distance from one another, for example in a screen printing process. On the surface 3 b prepared in this way, the wires 6 were then stretched, the arrangement is then covered with the upper ceramic layer 2 b, as indicated by the arrows. After or during the lamination, depressions 16 or grooves 17 can again be embossed along the grating 18 . An individualization by cutting the still unfired arrangement along the drawn lines 19 is also possible with this arrangement due to the small ceramic thickness, as is being separated by breaking or sawing after the sintering step.

Fig. 6 shows a further alternative embodiment to the production of a fuse element according to Fig. 4. Here, the cover hangings with parallel wires 6 th lower ceramic layer 2 is effected by a longitudinal upper ceramic layers 2 b of small width. The line network 18 already drawn here from lines 19 shows in Fig. 2b that the coverage of the wire 6 per securing element 1 takes place only in the central region. If this manufacturing process is extended by the application of layers 3 of a paste 3 a, the variation of the method according to FIG. 6 a results in a significantly enlarged and differently shaped area of the contacts 10 for each securing element 1 . For the sake of clarity, this representation as well as the representation of combination solutions with features such. B. Fig. 2d and Fig. 6b waived tet.

Examples of the use and installation of a fuse element 1 as a combination fuse 20 in known Ge housing designs 21 are outlined in Fig. 7a and Fig. 7b. In Fig. 7a shows a way of installing a finished fuse element 1 of Fig. 6b in a glass tube 22 which is closed at the end with metal caps 23 . When assembling the arrangement, an electrically conductive connection is produced between the contacts 10 of the securing element 1 and the associated metal cap 23 . Thus, the adaptation of the fuse element 1 to circuits and standard devices and fuseholders from the range of 125 V or 250 V voltage levels has been carried out.

The installation of a fuse element 1 of the extended embodiment from FIG. 6b as an SMD component in a standardized or widely used fuse housing 21 is shown in FIG. 7b. Here, the housing of the known TR 5 ^® fuse has been chosen as the example of a fuse housing 21 . The housing consists of a cap 24 which is latched to a housing socket 25 through which pins 26 come out as electrical contacts. The securing element 1 is turned the other way, so that a layer 3 of sintered conductive paste 3 a comes into contact with one end 27 of a pin 26 . In the present example, the ends 27 are stamped flat, so that the securing element 1 rests on the ends 27 in the region of the layers 3 . The ends 27 can also be stamped into steps and / or bent inwards or outwards in order to be able to hold the securing element 1 better. The centered angeord designated fuse element 1 is then soldered to the layers 3 with the ends 27 .

Alternatively, a part 28 of the ceramic outer body 8 can also serve as a base 29 , on which the securing element 1 can be glued to the housing base 25 . The length of the pins 26 from the housing base 25 to the ends 27 is in this manufacturing process with the height of the base 29 men. The contact is made here via the contact surfaces 10 formed on the pins 26 in a process according to FIGS. 6a-6b by soldering in a conventional SMD process.

Reference list

1

Securing element

2nd

green ceramic layer

2nd

a lower ceramic layer

2nd

b upper ceramic layer

2nd

c outer green ceramic layer

3rd

layer

3rd

a paste

3rd

b surface

4th

Face

4th

a end edge

5

Fuse element

6

wire

7

arrangement

8th

outer ceramic body

9

line

10th

Contact

11

Conductive paste

12th

Central axis

13

Perforation

14

Dimensions

15

Embossing

16

deepening

17th

Groove

18th

Grid

19th

line

20th

Combined fuse element

21

Housing design

22

Glass tube

23

Metal cap

24th

cap

25th

Housing base

26

pen

27

End of the pen

28

Part of the outer body

29

base

30th

Claims (28)

1. A method for producing an electrical fuse element with an essentially ceramic housing, characterized in that

• - A fuse element ( 5 ) in this way
• - is placed between two green ceramic layers ( 2 a, 2 b),
• - That it runs at least between opposite end edges ( 4 a) of the ceramic layers ( 2 a, 2 b) and
• - This arrangement ( 7 ) pressed and
• - is then sintered.

2. The method according to claim 1, characterized in that the arrangement ( 7 ) is pressed in a temperature-controlled environment. 3. The method according to one or both of the preceding claims, characterized in that the arrangement ( 7 ) in the region of the end faces ( 4 ), on which the fuse element ( 5 ) is located, is metallized, preferably by application and subsequent sintering a conductive paste ( 11 ). 4. The method according to one or more of the preceding claims, characterized in that

• - On the surface ( 3 b) at least one green ceramic layer ( 2 ),
• - which comes into contact with the fuse element ( 5 ),
• - In areas opposite one another, preferably the areas of the end edges ( 4 a),
• - Leitpaste ( 11 ) is preferably applied in strip form.

5. The method according to one or more of the preceding claims, characterized in that the fusible conductor ( 5 ) is guided as a wire ( 6 ) between the green ceramic layers ( 2 ) in a specific shape, in particular is drawn or stretched straight. 6. The method according to one or more of the preceding claims, characterized in that a filling material between the green ceramic layers ( 2 a, 2 b) is inserted and laminated, the filling material preferably partially enclosing the fuse element ( 5 ). 7. The method according to one or more of the preceding claims, characterized in that at least one of the green ceramic layers ( 2 a, 2 b) before the insertion of the fuse element ( 5 ) in the region of the central axis ( 12 ) is perforated. 8. The method according to claim 7, characterized in that the fuse element ( 5 ) between two in the region of the central axis ( 12 ) perforated green ceramic layers ( 2 a, 2 b) is arranged. 9. The method according to one or both of the preceding claims 7 and 8, characterized in that the perforations ( 13 ) of the green ceramic layers ( 2 a, 2 b) are arranged one above the other. 10. The method according to one or more of the preceding claims 7-9, characterized in that the perforations gene ( 13 ) with a mass ( 14 ) are filled. 11. The method according to one or more of the preceding claims 7-10, characterized in that the perforations ( 13 ) of the arrangement ( 7 ) with the intermediate fuse element ( 5 ) is covered by at least one outer green ceramic layer ( 2 c) and in particular both perforations ( 13 ) are each closed by at least one outer green ceramic layer ( 2 c). 12. The method according to one or more of the preceding claims, characterized in that green ceramic layers ( 2 ) of the same shape in the arrangement ( 7 ) are added together. 13. The method according to one or more of the preceding claims 1-11, characterized in that

• - In the production position at least one green ceramic layer ( 2 ) is brought up above the fuse element ( 5 ),
• - On the two sides, over which the fuse element ( 5 ) runs, jumps back relative to the lower ceramic layer ( 2 a).

14. The method according to one or more of the preceding claims, characterized in that the securing element ( 1 ) is manufactured in a multiple use. 15. The method according to claim 14, characterized in that the arrangement ( 7 ) is separated after sintering, preferably by breaking. 16. The method according to one or more of the preceding claims, characterized in that in the step of pressing the arrangement ( 7 ) at the same time grooves ( 17 ) or other depressions ( 16 ) in the green layers ( 2 a, 2 b) Arrangement ( 7 ) are impressed. 17. The method according to one or more of the preceding claims, characterized in that arrangements ( 7 ) of more than two layers ( 2 ) are separated after pressing and before sintering, preferably by sawing or breaking. 18. Securing element with an essentially ceramic housing, characterized in that

• - a fuse element ( 5 )
• - between two
• - Ceramic layers adhering to each other in the green state ( 2 a, 2 b)
• - From one end edge ( 4 a) to the other end edge ( 4 a) and
• - after solidification of the arrangement ( 7 )
• - on the end faces ( 4 )
• - at which the fuse element ( 5 ) emerges
• - Contacts ( 10 ) are arranged.

19. Securing element according to claim 18, characterized in that the arrangement ( 7 ) is consolidated by a sintering process. 20. Fuse element according to one or both of the preceding claims 18 and 19, characterized in that the fuse element ( 5 ) is designed as a wire ( 6 ). 21. Fuse element according to one or more of the preceding claims 18-20, characterized in that a filler material is laminated between the ceramic layers ( 2 ). 22. Securing element according to one or more of the preceding claims 18-21, characterized in that the surface ( 3 b) at least one ceramic layer ( 2 ) in the region of the central axis ( 12 ) has a hole ( 13 ) or a recess ( 13 a ) having. 23. Securing element according to one or more of the preceding claims 18-22, characterized in that the fuse element ( 5 ) runs between two ceramic layers ( 2 a, 2 b) along the central axis ( 12 ), both ceramic layers ( 2 a, 2 b) have a hole ( 13 ) or a recess ( 13 a) in the region of the central axis ( 12 ), through which the fuse element extends in a self-supporting manner. 24. Securing element according to one or more of the preceding claims 18-23, characterized in that the recess ( 13 a) or the hole ( 13 ) is filled with a mass ( 14 ). 25. Securing element according to one or more of the preceding claims 18-24, characterized in that the perforations ( 13 ) layers in the green state of the ceramic layers ( 2 a, 2 b) are each covered by a further ceramic layer ( 2 ). 26. fuse element according to one or more of the preceding claims 18-25, characterized in that the upper ceramic layer (2 b) and the lower ceramic layer (A 2) have the same geometric shape and size. 27. Fuse element according to one or more of the preceding claims 18-26, characterized in that at least one of the ceramic layers ( 2 ) on the two end edges ( 4 a), over which the fuse element ( 5 ) runs, relative to at least one adjacent layer ( 2 ) to jump back. 28. Fuse element according to one or more of the preceding claims 18-27, characterized in that the ceramic layers ( 2 ) have vias.