Fuse, and process for manufacturing a fuse

Abstract

The invention relates to a fuse (1), in particular an SMD fuse and / or an instrument fuse, comprising an insulator (2), a fusible conductor (3) arranged in the insulator (2), and outer contact caps (4) which are placed on the insulator (2) and are electrically connected to the fusible conductor (3). According to the invention, in order to be arranged in a stable position in the insulator (2), the fusible conductor (3) is at least frictionally engagingly attached by means of an attachment device (8).

Description

[0001] The present invention relates to a fuse, in particular an SMD fuse and / or a device protection fuse, comprising an insulating body, a fusible link arranged in the insulating body and external contact caps placed on the insulating body and electrically connected to the fusible link.

[0002] A fuse or device protection fuse as defined in the present invention is also referred to in the prior art as a so-called "fuse insert", which can interact with a fuse holder. The fuse insert can be inserted into the fuse holder.

[0003] If required, the fuse or fuse element is filled with an extinguishing agent, in particular sand, granules, and / or glass beads, and the extinguishing agent is arranged within the insulating body. The insulating body may be designed as an insulating tube. The fusible link may be inserted axially into the insulating body. The electrical contact between the fusible link and the outer contact caps is established by a solder connection. Furthermore, the solder connection also provides a metallurgical bond between the outer contact caps and the insulating body.

[0004] Preferably, the insulating body inside need not be completely filled with the extinguishing agent. In particular, the insulating body is partially filled and / or completely filled with the extinguishing agent.

[0005] The fusible link is designed to carry the full load current during operation and, in particular, to interrupt an overload current and / or short-circuit current as quickly as possible.

[0006] SMD fuses are fuse links that can be mounted on printed circuit board surfaces (SMD - Surface Mounted Device). SMD fuses thus belong to the technical field of surface mount technology (SMT - Surface Mounted Technology). In surface mount technology, printed circuit boards are typically used as the mounting surface. SMD fuses are standardized with regard to their dimensions and electrical characteristics – see IEC 60127-4 (December 2020 edition) in this context.

[0007] A disadvantage of the fuse known from the prior art is that, in some fuses, the fusible link shifts or moves within the insulating body during fuse manufacturing – after it has been inserted. Ultimately, the fusible link does not remain in its intended position. Thus, during fuse installation, the fusible link may come into contact with the inner wall of the insulating body or even directly touch it. Such a displacement of the fusible link within the insulating body alters the switching behavior of the entire fuse and, in particular, no longer corresponds to its rated values. This is extremely detrimental, as each fuse is designed for specific values ​​and is used accordingly. Any deviation from the rated values ​​must therefore be strictly avoided.

[0008] While fuses with "displaced" fusible links can be rejected after manufacturing using optical inspection methods, this procedure is comparatively complex and expensive, especially since each individual fuse must be visually inspected. Furthermore, due to the opaque insulating body, this visual inspection can only be performed before the outer contact caps are fitted. If the fusible link shifts after or during the fitting of the outer contact caps, this shift can no longer be detected visually.

[0009] A further disadvantage of the fuse known from the prior art, or of the prior art method for manufacturing fuses, is that the connection between the fusible link and the solder joint for electrical contacting the outer contact caps is often insufficient for a permanent electrical connection. In particular, the formation of a so-called "solder ball"—a sphere of solder material—is required for electrical contact between the fusible link and the outer contact cap, but this is often not reliably achieved. It can happen that the solder or solder material seeps into the space between the outer contact cap and the insulating body, resulting in insufficient solder for a sufficient electrical connection between the fusible link and the outer contact caps.

[0010] US 10,290,456 relates to a fuse with a fusible link arranged in the insulating body and external contact caps placed on the insulating body and electrically connected to the fusible link.

[0011] US 4,646,053 A also concerns a fuse with an insulating body and a fusible link attached to it.

[0012] US 5,736,918 A concerns a fuse with an insulating body.

[0013] US 4,935,716 A concerns a fuse with a round connector.

[0014] The object of the present invention is therefore to avoid or at least substantially reduce the aforementioned disadvantages of the prior art.

[0015] According to the invention, the aforementioned problem is solved, at least essentially, in a fuse of the type mentioned at the outset, by means of a friction-fit fixing device for the fusible link during fuse assembly. This allows the fusible link to be held in a stable position within the insulating body until the final connection of the fusible link with the contact caps.

[0016] According to the invention, the fixing device ensures that the fusible link is securely fixed in the insulating body, in particular centered and / or axially aligned. Subsequent displacement of the fusible link within the insulating body until the final assembly of the fuse is also prevented.

[0017] Furthermore, it is understood that the fusible link can (additionally) be bonded to the fixing device, the insulating body, and / or the outer contact cap by a material bond. This condition can certainly exist after the final assembly of the fuse. At the very least, however, the fixing device should be designed such that the fusible link can be frictionally fixed within it. Therefore, it is understood that, in addition to the frictional connection between the fixing device and the fusible link, at least one material bond can be provided for fixing the fusible link, with the frictional connection being made first in the procedural sequence, followed later by further connections as needed.

[0018] Advantageously, the invention eliminates the need for a complex optical and manual inspection process of the manufactured fuses. Consequently, the manufacturing costs of the fuse according to the invention – despite the necessary fixing device – can be reduced compared to fuses known from the prior art, preferably by at least 10%, due to the elimination of discarded fuses. Furthermore, the invention particularly ensures that damage caused by defective fuses cannot occur.

[0019] Furthermore, fuses can be provided in which the fusible link is arranged axially and / or centrally within the insulating body. The fixing device prevents the fusible link from resting against or striking the inner wall of the insulating body, both immediately after manufacture and after a certain period of use.

[0020] The preferably positionally stable arrangement of the fusible link in the insulating body is therefore associated with a multitude of advantages.

[0021] Ultimately, a defined placement of the fusible link in the insulating body is preferably achieved via the fixing device according to the invention.

[0022] The fuse according to the invention can be designed as a so-called square (SMD) fuse - i.e. a fuse with an at least substantially cuboid insulating body or a fuse with an at least substantially square cross-section - as well as a cylindrical fuse - i.e. a fuse with an at least substantially cylindrical insulating body or a fuse with an at least substantially circular cross-section.

[0023] Furthermore, the fixing device in particular improves the electrical contact between the fusible link and the outer contact caps - especially since the fusible link occupies a predetermined position in the insulating body, so that the application of the electrical contacting medium and / or the solder joint can be carried out in a targeted and safe manner.

[0024] In a preferred embodiment, the fusible link can be arranged on and / or attached to a support element or carrier material, in particular applied and / or wound onto it. The support element can, in particular, be at least one optical fiber and / or an optical fiber core. In this context, it is understood that preferably the support element, together with the fusible link, is fixed in the fixing device by at least frictional engagement. The support element can extend partially or completely over the length of the fusible link.

[0025] Preferably, the fusible link has a central region surrounded by end regions. The end regions are the outer areas of the fusible link, which may include the outer ends or the outer end faces of the fusible link – but are not limited to these. In particular, the end region of the fusible link can, for example, correspond to at least 2%, preferably between 2% and 45%, and more preferably between 3% and 10% of the length of the fusible link. It is also understood that the lengths of the end regions can differ from one another.

[0026] Furthermore, the fusible link can be designed as an elongated wire.

[0027] According to the invention, the fixing device is designed such that the fusible link is clamped at least in one end region, preferably in the end region. Clamping is ensured in particular by frictional engagement in the fixing device. The area of ​​the fusible link clamped in the fixing device is hereinafter also referred to as the "fixing point".

[0028] In this context, it is understood that a section of the fusible link can also extend beyond the fixing point. Therefore, the fixing point does not necessarily have to form the outer end or the outer face of the fusible link.

[0029] Consequently, the particularly elongated fusible link can be fixed in the area of ​​its ends or in the end-side areas.

[0030] The fusible link is, in particular between the clamping points or fixing points, at least substantially under tension and / or taut.

[0031] Furthermore, the length of the fusible link can exceed the length of the insulating body or be at least substantially equal to it. Alternatively, the fusible link can be designed to be shorter than the length of the insulating body.

[0032] Preferably, the fusible link can be arranged completely within the insulating body. Alternatively, the fusible link can also project beyond at least one end face of the insulating body. The arrangement of the fusible link within the insulating body can be adapted, in particular, to the desired electrical contact with the outer contact caps, preferably to simplify the manufacturing process.

[0033] In a further preferred embodiment, the fixing device is at least frictionally connected to the insulating body. It is understood that the fixing device can also be materially bonded to the insulating body. In particular, the fixing device is preferably designed to be frictionally connected to the insulating body. The fixing device can therefore be arranged at least partially within the insulating body. The fixing of the fusible link can be carried out inside or outside the insulating body via the fixing device – i.e., the fixing point can be located inside or outside the insulating body.

[0034] According to the invention, the fixing device comprises at least two fixing means, each assigned to an end region of the insulating body. The fixing means can be arranged at least partially within the insulating body, in particular wherein the fixing means can be frictionally connected to the insulating body at least partially.

[0035] It is understood that the fixing elements of the fixing device do not need to be directly connected to each other. Accordingly, two separately operable fixing elements can be provided, in particular so that the fixing device can be composed of at least two independent, but preferably identical, components.

[0036] The two fixing means can each be assigned to an end region of the insulating body, preferably an end face region of the insulating body. Furthermore, the insulating body can be tubular, preferably either cylindrical or cuboid, and in particular have outwardly open end faces.

[0037] Preferably, the fixing means can be connected to the insulating body via or by passing through the open end faces of the insulating body, which facilitates the attachment of the fixing device.

[0038] According to a further preferred embodiment of the invention, the fixing element has a clamping opening for guiding and fixing the fusible link. According to the invention, the fixing element is made of an elastic material. Friction-fit fixing in the clamping opening can be achieved, in particular, due to the elasticity of the fixing element's material.

[0039] Furthermore, the fixing agent can have an outer area located outside the insulating body and an inner area adjoining the outer area for insertion into the insulating body. The outer area can thus border the end face of the insulating body. In addition to the outer end faces, the insulating body can also include a sheath.

[0040] Preferably, the inner area of ​​the fixing element is held in the insulating body by frictional engagement. Alternatively or additionally, the outer area can be separated from the inner area by a stop designed to rest against the end face of the insulating body.

[0041] Furthermore, in other preferred embodiments, the outer surface can at least partially abut the outer surface of the insulating body. In this embodiment, for example, the fixing means can be considered an additional (auxiliary) cap, which can be attached, in particular, to the respective end face of the insulating body.

[0042] Furthermore, in another preferred embodiment, the clamping opening is designed as a cross-sectional constriction of the fixing means and / or the fixing device. The cross-sectional constriction can, in particular, have a shape such that the clear opening width or the diameter and / or the width of the clamping opening in the unloaded state of the fixing means and / or the fixing device is smaller than the width and / or the diameter of the fusible link.

[0043] Furthermore, the fixing device can have at least two, and in particular three, elastic or spring-loaded clamping arms for fixing the fusible link. The clamping arms can be adjacent to one another and, in particular, form the clamping opening. A spacer can also be provided between adjacent clamping arms. The clamping arms enable secure fixing of the fusible link.

[0044] Furthermore, the fixing element can have external, preferably spring-loaded and / or elastically deformable, clamping ribs for frictional engagement with the insulating body. Preferably, at least two, and more preferably between three and five, clamping ribs are provided. The clamping ribs can, in particular, frictionally engage the fixing element with the insulating body, thus ensuring simple attachment of the fixing device.

[0045] Furthermore, the clamping ribs can be designed either as radially projecting ribs or as axially aligned clamping ribs.

[0046] The clamping legs can be enclosed or surrounded by the clamping ribs. In particular, a gap is provided between the clamping legs and the clamping ribs. This allows the clamping legs to ensure, in particular, central positioning of the fusible link within the insulating body, while the clamping ribs can frictionally connect the fixing element to the insulating body.

[0047] In a further preferred embodiment, the fixing means can be designed as a plug. In particular, the fixing means is designed as a lamellar plug having at least two lamellae. The lamellae of the lamellar plug can be considered, in particular, as radially oriented clamping ribs that preferably ensure a friction-fit connection to the insulating body and / or that are preferably – viewed in cross-section – at least substantially annular in shape. Furthermore, the plug can have and / or consist of an elastic material.

[0048] Furthermore, in another preferred embodiment of the invention, the fixing device, which comprises an elastic material, has at least two clamping openings for guiding and fixing the fusible link. In this embodiment, which is described below, two spaced-apart fixing means are not required. The fusible link can be fixed in the respective clamping opening by friction, particularly due to the elastic material properties of the fixing device.

[0049] In this preferred embodiment, the fixing device can be designed as an elongated, in particular one-piece, sleeve body. Preferably, the sleeve body is inserted or arranged in the insulating body, at least partially, and preferably completely. The sleeve body can, in particular, be frictionally connected to the insulating body.

[0050] Furthermore, the length of the sleeve body can correspond at least substantially to the length of the insulating body. In other embodiments, however, the length of the sleeve body can also be shorter or longer than the length of the insulating body.

[0051] Ultimately, the sleeve body can be positioned within the insulating body, ensuring secure centering of the fusible link. The length of the sleeve body can be specifically adapted to the electrical connection between the fusible link and the outer contact cap. Consequently, depending on the sleeve body's design, various connection methods between the fusible link and the outer contact cap are possible.

[0052] Furthermore, the sleeve body can have elongated through-openings. These through-openings can extend, in particular, over the entire length of the sleeve body. Preferably, the through-openings are arranged such that they enclose and / or surround the clamping opening. Preferably, the sleeve body has at least 2 to 15, more preferably 3 to 10, and more preferably 4 to 8, through-openings. The through-openings can, in particular, modify the elastic properties of the sleeve body. For example, by compressing the through-openings, an improved friction-fit arrangement of the sleeve body within the insulating body can be ensured. Thus, the through-openings increase, in particular, the flexibility and / or adaptability of the sleeve body to the insulating body, preferably to different shapes of the insulating body.

[0053] Furthermore, in another preferred embodiment, the fixing device, designed as a sleeve body, has a chamber between the two clamping openings that is wider than the clamping openings. This chamber can be considered, in particular, as an inner chamber. Preferably, the chamber can contain an extinguishing agent, in particular extinguishing sand, granules, and / or glass beads. Alternatively or additionally, the fusible link can be arranged at least substantially centered within the chamber by means of the fixing device.

[0054] The chamber, particularly in cross-section, can have at least substantially the shape of a preferably elongated octagon. The aforementioned cross-section extends, in particular, through both the clamping openings and the chamber itself. Preferably, the inner chamber can have a central, preferably at least substantially cylindrical, region and, adjacent to each clamping opening, a connection region, preferably frustoconical.

[0055] In a further preferred embodiment, the fixing means and / or the fixing device has an outer insertion area that is wider than the clamping opening. In particular, the insertion area opens into the clamping opening. The insertion area may have insertion ramps adjacent to the clamping opening, especially with respect to the longitudinal axis of the insulating body. Preferably, the insertion area is at least substantially symmetrical, and more preferably rotationally symmetrical.

[0056] In particular, the insertion area faces the end face of the insulating body and / or is located in the area of ​​the end face of the insulating body. As explained above, the insulating body can, in particular, have two end faces and a lateral surface.

[0057] Preferably, an insertion opening is provided in the area of ​​the end face of the insulating body. This allows for relatively easy insertion of the fusible link into the insulating body through the insertion opening and the insertion area, where the fusible link can be secured in the fixing device or fixing elements. Thus, the fusible link can be positioned via the insertion opening and the insertion area before the outer contact caps are fitted.

[0058] The fixing means and / or the fixing device can be firmly connected to the insulating body, in particular by friction and in a positionally stable manner, before or after the fusible link is inserted into the insulating body.

[0059] The insertion section can extend both across the exterior and at least partially across the interior. The insertion opening is formed, in particular, on the exterior. Preferably, the insertion area extends from the exterior into the interior.

[0060] Furthermore, the fixing device and / or the fixing agent may comprise and / or consist of an electrically insulating material, preferably plastic, more preferably an elastomeric plastic.

[0061] Preferably, the clamping leg and / or the clamping rib has and / or consists of an elastomeric plastic material.

[0062] Alternatively or additionally, it may be provided that the fixing device and / or the fixing agent is made of or consists of silicone, natural rubber, silicone rubber and / or synthetic rubber and / or mixtures thereof.

[0063] Preferably, the material of the fixing device and / or the fixing medium is electrically insulating. Electrical contact with the fusible link can be achieved by other means.

[0064] In an alternative and also preferred embodiment, the fixing device and / or the fixing means comprises and / or consists of an electrically conductive material, in particular metal and / or a metal alloy. Preferably, electrical contact of the fusible link can thus be achieved via the fixing device and / or the fixing means.

[0065] It is particularly preferred that the fixing device and / or the fixing agent electrically connects the fusible link to the outer contact cap.

[0066] In particular, this eliminates the need for an additional contact medium that would otherwise be required to contact the fusible link.

[0067] In a further preferred embodiment, the fixing device and / or the fixing means has at least one additional opening. This additional opening may be designed to introduce an extinguishing agent, preferably extinguishing sand, granules, and / or glass beads, into the inner area of ​​the insulating body. This additional opening may, in particular, be configured as a through-hole.

[0068] In this context, it is understood that preferably a plurality of additional openings are provided. In particular, between 3 and 25, preferably between 5 and 15, additional openings are provided. These additional openings make it relatively easy to fill the insulating body with the extinguishing agent, either after or before the fusible link is in place.

[0069] Preferably, the additional openings are spaced apart from the clamping opening. In particular, the additional openings are arranged closer to the inner wall of the insulating body compared to the clamping opening. Preferably, the additional openings surround or enclose the clamping opening.

[0070] Preferably, at least one elongated clamping rib is provided on at least one clamping rib and / or on the outer surface of the fixing device, which is designed as a sleeve body. The additional clamping rib can serve to abut the inner wall of the insulating body and to space the clamping rib and / or the fixing device from the inner wall of the insulating body.

[0071] In particular, the clamping ridge enables the fixing device and / or the fixing element to be arranged frictionally within the insulating body. Preferably, the clamping ridge is made of, or consists of, an elastomeric plastic. Preferably, a plurality of clamping ridges, in particular between 2 and 10, are arranged on the sleeve body and / or the fixing element. Furthermore, the additional clamping ridges can be spaced at least substantially equally apart from one another.

[0072] In cross-section, the clamping webs can be at least essentially triangular in shape. However, other geometric designs of the clamping web are also conceivable.

[0073] Ultimately, the clamping ridge is used to simplify the arrangement of the fixing device within the insulating body. In particular, deformation of the clamping ridge ensures a frictional connection between the fixing device and the insulating body.

[0074] In this context, it is understood that the maximum width of the inner area, preferably including the clamping ribs, exceeds the inner diameter and / or the inner width of the insulating body. Accordingly, a frictional connection between the fixing device and the insulating body is achieved through deformation of the fixing device.

[0075] In particular, the width and / or the clear diameter of the clamping opening in the unloaded state is smaller than the width and / or diameter of the fusible link. Preferably, the width and / or diameter of the fusible link exceeds the width and / or diameter of the clamping opening by at least 5%, more preferably by at least 10%.

[0076] As previously explained, the outer contact caps are preferably arranged on the outside, at least on the end faces of the insulating body. The outer contact caps may also be spaced apart from the end faces of the insulating body. In particular, the fixing device and / or fixing element may be arranged between the end face of the insulating body and the inner surface of the outer contact cap facing the insulating body. Finally, the outer contact caps are designed, in particular, to be pushed onto the insulating body.

[0077] Furthermore, the outer contact caps may be made of or consist of metal. In particular, the outer contact caps must be made of an electrically conductive material.

[0078] Furthermore, the outer contact caps can be metallurgically bonded to the insulating body, preferably via a bonding agent. For example, the outer contact caps can be soldered to the insulating body.

[0079] Furthermore, the insulating body may have and / or consist of an electrically insulating material, preferably glass and / or ceramic.

[0080] The fusible link can be made of an electrically conductive material, preferably a metal, and / or consist of such a material. Materials used for the fusible link include copper, nickel, steel, gold, and / or silver. Furthermore, the fusible link can also be made of a metal alloy, for example, a silver and / or copper alloy.

[0081] The fusible link can be designed as a fusible link wire and / or as a fusible link strip. Furthermore, the fusible link can have a cross-section that is at least substantially circular and / or elliptical or at least substantially rectangular.

[0082] Furthermore, the fusible link can be provided with constrictions, which allow for a faster or slower overload and / or short-circuit response. These constrictions can be designed, in particular, as cross-sectional reductions.

[0083] The extinguishing agent may, in particular, comprise extinguishing sand with a preferably defined grain size distribution, which is preferably suitable for use in safety operations. Furthermore, colored sands, sand and / or ceramic fragments, and / or glass beads may also be used as extinguishing agents.

[0084] In a further preferred embodiment, the respective end region of the fusible link is electrically connected to the respective outer contact cap via an electrically conductive connecting element. In particular, the connecting element is arranged, at least partially, in the insertion area of ​​the fixing element and / or the fixing device. Preferably, the connecting element does not extend through the respective clamping opening into the interior of the insulating body, which is arranged between the clamping openings.

[0085] The connecting element can also be configured to electrically contact the fusible link and preferably connect it to the outer contact cap. In this way, the connecting element can be configured as a contact element. Preferably, the connecting element can be configured as a solder joint and / or as an electrically conductive adhesive, particularly a lead-free one.

[0086] In particular, a low-temperature solder can be used as a bonding agent, especially where the bonding agent can no longer penetrate the entire installation space and / or the entire insertion area in liquid form, particularly during reflow.

[0087] The connecting element can therefore be designed to preferably bond the outer contact cap to the fixing agent and / or the insulating body in a material-bonded manner.

[0088] Furthermore, in other embodiments, the fixing device can be arranged partially or completely within the insulating body. When the fixing device is designed as a sleeve body, it is particularly important (as explained above) that the sleeve body is arranged at least substantially completely within the insulating body. The length of the sleeve body can correspond at least substantially to the length of the insulating body.

[0089] Preferably, the fixing agent and / or the insertion opening is at least substantially completely covered by the outer contact cap.

[0090] In a further preferred embodiment, the fixing device is provided that, on the outside, it does not project radially – with respect to the longitudinal axis of the insulating body – beyond the outer surface of the insulating body. Preferably, the fixing device and / or the fixing means is at least substantially flush with the end face or is spaced apart from and / or recessed from the outer edge of the end face of the insulating body.

[0091] Furthermore, the aforementioned problem is solved, at least substantially, by a method for manufacturing a fuse, in particular an SMD fuse and / or a device protection fuse, according to one of the embodiments described above. The method comprises the following process steps, which are preferably carried out in the specified order (sequentially): A) Providing an insulating body, a fusible link, a fixing device, and external contact caps; B) Inserting the fixing device into the insulating body; C) Inserting the fusible link into the insulating body using the fixing device and frictionally fixing the fusible link in the fixing device so that the fusible link is arranged in the insulating body in a positionally stable manner, wherein the fusible link is clamped at least at one end by the fixing device, wherein the fixing device has two fixing means, each assigned to an end of the insulating body, wherein the fusible link is passed through a clamping opening of the fixing means, which has an elastic material, and is fixed in this clamping opening; D) Electrically connecting the external contact caps to the fixed fusible link; E) Placing the external contact caps onto the insulating body.

[0092] In connection with the method according to the invention, reference may be made to the aforementioned preferred embodiments and advantages of the safeguard, which apply equally to the method according to the invention, in particular without the need for further explicit mention. At the same time, the method features specified below also apply equally to the safeguard according to the invention described above. Therefore, to avoid unnecessary repetition, reference is made to the aforementioned explanations.

[0093] Preferably, an extinguishing agent can be introduced into the insulating body after step C) and, in particular, before step D). Extinguishing sand, granules, and / or glass beads are especially suitable as extinguishing agents.

[0094] In particular, it is intended that the insulating body is not completely filled with the extinguishing agent. Preferably, the insulating body is at least partially filled with the extinguishing agent.

[0095] Preferably, the fusible link is inserted into the insulating body by means of a tool, preferably a feeding needle, by introducing it into or through the fixing device. In particular, the fusible link can be inserted through the clamping opening and fixed therein by means of the tool.

[0096] Preferably, the fusible link is first inserted into the clamping opening and guided with the tool, preferably the feed needle, to the further or opposite clamping opening and fixed in this by friction.

[0097] Preferably, the fusible link can be inserted into the insulating body by means of a tool, in particular the feed needle, that widens or opens the clamping opening for the insertion of the fusible link. When the tool is withdrawn, the clamping openings then close, so that the fusible link is securely held or fixed in the intended position.

[0098] After arranging the fusible link in the insulating body and fixing the fusible link, preferably in a position-stable manner, the fusible link can be electrically connected to the outer contact cap, preferably by applying an electrically conductive adhesive as a connecting agent between the fusible link, particularly in the insertion area, and the outer contact cap.

[0099] In particular, the bonding agent, preferably the electrically conductive adhesive, can first be arranged in the insertion area, preferably so that the fusible link is contacted. The outer contact cap can then be attached, so that a material bond between the outer contact cap and the insulating body and / or fixing device can be achieved.

[0100] In addition to a friction-fit arrangement of the fixing device and / or the fixing agent in the insulating body, it may also be provided that the fixing device and / or the fixing agent is additionally bonded to the insulating body, at least in some areas.

[0101] Furthermore, the outer cap can be placed over the insulating body, preferably over the fixing agent and / or the fixing device, by overpressure, so that in particular the bonding effect by material connection between outer contact cap and insulating body can be dispensed with.

[0102] In particular, the fusible link can be arranged centrally in the insulating body, which is especially advantageous for the behavior of the fuse.

[0103] In particular, a low-temperature solder can be used as a bonding agent in the manufacturing process according to the invention, since preferably the bonding agent can no longer penetrate the entire installation space in the liquid state, especially during reflow.

[0104] Furthermore, it is understood that the aforementioned intervals and range limits include any intermediate intervals and individual values ​​and are to be considered as being disclosed as essential to the invention, even if these intermediate intervals and individual values ​​are not specifically stated.

[0105] Further features, advantages, and applications of the present invention will become apparent from the following description of exemplary embodiments with reference to the drawing and the drawing itself. All features described and / or illustrated, individually or in any combination, constitute the subject matter of the present invention, irrespective of their compilation in the claims or their cross-reference.

[0106] It shows: Fig. 1 a perspective sectional view of a schematically represented safety device according to the invention, Fig. 2 a perspective sectional view of the in Fig. 1 schematically shown fuse without external contact caps, Fig. 3 a sectional view of the in Fig. 2 components shown, Fig. 4 a sectional view along section II from Fig. 3 , Fig. 5 a sectional view along section II-II from Fig. 3 , Fig. 6 a perspective view of a in Fig. 1 schematically represented fixing agent, Fig. 7 another perspective view of the in Fig. 6 schematically represented fixing device, Fig. 8 a perspective sectional view of a further embodiment of a schematically represented securing device, Fig. 9 a perspective sectional view of the in Fig. 8 shown fuse without external contact caps, Fig. 10 a sectional view of the in Fig. 9 components shown, Fig. 11 a sectional view along section III-III from Fig. 10 , Fig. 12 a sectional view along section IV-IV from Fig. 10 , Fig. 13 a perspective view of a in Fig. 10 schematically represented fixing device, Fig. 14 a top view of the in Fig. 13 schematically illustrated fixing device, Fig. 15 a perspective sectional view of a further embodiment of a schematically illustrated securing device according to the invention, Fig. 16 a perspective sectional view of the in Fig. 15 shown fuse without external contact caps, Fig. 17 a sectional view of the in Fig. 16 schematically shown components, Fig. 18 a top view of the in Fig. 17 components shown, Fig. 19 a perspective view of a in Fig. 15 schematically represented fixing agent, Fig. 20 a side view of the in Fig. 19 schematically represented fixing agent, Fig. 21 another perspective view of the fixing agent made of Fig. 19 , Fig. 22 a perspective view of a schematically illustrated safety device according to the invention, Fig. 23 a perspective view of a further embodiment of a schematically illustrated safety device according to the invention and Fig. 24 a representation of a schematically illustrated process sequence according to the invention for the manufacture of a safety device.

[0107] Fig. 1 This shows a sectional view of fuse 1. Fuse 1 can be used in particular as an SMD fuse or device protection fuse.

[0108] In the following, "fuse 1" refers specifically to a fuse link that can be inserted into a fuse holder (not shown). However, it is understood that the following explanations apply particularly to the fuse link.

[0109] The fuse holder can have a fuse base, such as a socket, and a fuse holder, such as a screw or snap-on cap. The fuse base can be permanently installed in a device to be protected. The fuse holder can accommodate the fuse or fuse, thus allowing for easy replacement.

[0110] In the case of an SMD fuse 1, it may also be provided that the fuse 1 can be permanently connected to a circuit board not shown in detail.

[0111] Fig. 1 shows that the fuse 1 has an insulating body 2.

[0112] The insulating body 2 has a basic structure that is at least essentially cylindrical, as shown by the Fig. 23 schematically shown. Alternatively or additionally, at least essentially cuboid-shaped insulating bodies 2 can also be provided, as shown in the Fig. 22 schematically shown.

[0113] A fusible link 3 is arranged in the insulating body 2, as shown in the Fig. 1 schematically represented. The fusible link 3 can in particular be encased centrally in the insulating body 2, preferably at least substantially centered.

[0114] The fuse 1 further comprises outer contact caps 4, as shown schematically in the Fig. 1 , but also the Fig. 22 und 23 The outer contact caps 4 are electrically connected to the fusible link 3. Furthermore, each outer contact cap 4 is placed on the insulating body 2, in particular on the end faces 5 and 6 of the insulating body 2, preferably by crimping.

[0115] The insulating body 2 comprises end faces 5, 6 and a lateral surface 7. The end faces 5, 6 of the insulating body 2 are, in particular, at least substantially open or open.

[0116] Fig. 1 shows that the fusible link 3 is fixed at least frictionally by means of a fixing device 8, so that the fusible link 3 is arranged in the insulating body 2 in a positionally stable, preferably centered, manner via the fixing device 8.

[0117] It is not shown that, in addition to the friction-fit connection of the fusible link 3 and the fixing device 8, it may also be provided that the fusible link 3 can be connected to the fixing device 8, for example, by material bonding or form-fitting.

[0118] The fusible link 3 comprises a central region 9, which is enclosed by the end regions 10 and 11. In the installed state of the fusible link 3, the central region 9 is located within the insulating body 2. The end regions 10 and 11 of the fusible link 3 can form the clamping point or the fixing point.

[0119] In this context, it is understood that the end areas 10, 11 do not necessarily have to be clamped with their outer ends, but ultimately form an outer area of ​​the fusible conductor 3.

[0120] Accordingly, the fusible link 3 is at least frictionally secured, held or fixed in the fixing device 8 in the area of ​​its ends 10, 11.

[0121] The fusible conductor 3, which has an elongated shape, can be designed as a fusible wire or a fusible strip.

[0122] Not shown is that the fusible link 3 can be arranged on and / or attached to a carrier medium or carrier material, in particular applied and / or wound onto it. The carrier medium can be at least one optical fiber and / or an optical fiber core. The carrier medium can be fixed together with the fusible link 3, at least by friction, in the fixing device 8. The carrier medium can extend partially or completely over the length 12 of the fusible link 3.

[0123] In Fig. 15 It is shown that the length 12 of the fusible link 3 exceeds the length 13 of the insulating body 2.

[0124] In other embodiments, such as in Fig. 8 As shown, the length 12 of the fusible link 3 is less than or equal to the length 13 of the insulating body 2.

[0125] Furthermore, it is understood that the fusible link 3, when clamped or clamped in the fixing device 8, can also protrude beyond the clamped points or the fixing point, as schematically shown in the Fig. 1 This becomes apparent. Accordingly, the fixing point is located in the respective end area 10, 11.

[0126] Fig. 2 This shows that the fixing device 8 is at least frictionally connected to the insulating body 2. If necessary, the fixing device 8 can also be at least materially connected to the insulating body 2. Ultimately, however, the fixing device 8 is designed so that it can be frictionally connected to the insulating body 2, preferably detachably. In this way, the fixing device 8 can also be clamped at least partially in the insulating body 2.

[0127] The Fig. 2 shows the insulating body 2 and the fixing device 8 from the Fig. 1 However, for schematic representation purposes, the Fig. 2 bis 5 The fusible link 3 is not shown. Furthermore, the outer contact caps 4 are also not shown.

[0128] The Fig. 2 Figure 8 shows that the fixing device 8 has fixing elements 14 assigned to each end region of the insulating body 2. Each fixing element 14 can enclose an end region 10, 11 of the fusible link 3, as shown schematically in Figure 1. Fig. 1 becomes apparent.

[0129] The Fig. 6 und 7 show this in Fig. 2 The fixing means 14 are shown in a schematic perspective view. The fixing means 14 has a clamping opening 15 for guiding and fixing the fusible link 3. In the unloaded state, the clamping opening 15 can be closed or open – i.e., it can have a clear opening width or no clear opening width. Ultimately, the fixing means 14 is designed such that the clamping opening 15 can be opened to guide the fusible link 3, so that the end region 10, 11 of the fusible link 3 can be clamped in the clamping opening 15. The clamping opening 15 thus defines the fixing point of the fusible link 3 in the end region 10, 11. In this context, it should also be understood that the aforementioned fixing point need not be a point, but can also be an area and extend over a certain section or region.

[0130] The fixing element 14 can, in particular, comprise an elastic material. At least in the area of ​​the clamping opening 15, the fixing element 14 can be elastically designed so that the fusible link 3 can be fixed in the clamping opening 15 by frictional engagement due to the elasticity of the fixing element 14.

[0131] The Fig. 3 shows a sectional view of the in Fig. 2 components shown. Fig. 2 It becomes apparent that the fixing element 14 has an outer area 16 arranged outside the insulating body 2. The outer area 16 is designed to bear at least partially on the end face 5, 6 or the surface of the respective end face 5, 6 of the insulating body 2. Fig. 2 The figure shows that the outer surface 16 does not project beyond the outer edge of the respective end face 5, 6. Furthermore, the outer surface 16 does not border the outer surface 7 of the insulating body 2.

[0132] In further embodiments, however, the outer area 16 can extend beyond the outer edge of the respective end face 5, 6 and, in particular, can adjoin and / or be arranged against the outer surface 7 of the insulating body 2.

[0133] Even the Fig. 16 and 17 clarify that an outdoor area 16 is planned.

[0134] The embodiment according to the Fig. 15 bis 18 differs from those in the Fig. 1 bis 5 The embodiments shown are such that the outer surface 16 of the fixing means 14 projects at least partially beyond the outer edge of the end face 5, 6 of the insulating body 2. A projection is particularly evident from the Fig. 18 top view of the components shown Fig. 17 stand out. Fig. 17 shows in turn the in Fig. 16 section shown in a sectional view.

[0135] The Fig. 6 and 19show that the outer area 16 is adjoined by an inner area 17 of the fixing agent 14.

[0136] The Fig. 2 Figures 16 and 16 again illustrate that the inner area 17 is intended to be inserted into the insulating body 2.

[0137] The inner area 17 is preferably held in the insulating body 2 by friction.

[0138] The Fig. 6 and 19 Furthermore, the figures show that the outer area 16 is separated from the inner area 17 by a stop 18. The stop 18 is designed to rest against the respective end faces 5, 6 of the insulating body 2. The arrangement of the stop 18 on the end faces 5, 6 is particularly evident from the figures. Fig. 3 and 17 stand out.

[0139] The clamping opening 15 can be designed, in particular, as a cross-sectional narrowing of the fixing means 14 and / or the fixing device 8. Such a cross-sectional narrowing is schematically shown, in particular, by the Fig. 3 and 17 stand out.

[0140] Even at the in Fig. 9 In the further embodiment of the fixing device 8 shown, which will be discussed in more detail below, the clamping opening 15 is designed as a cross-sectional narrowing.

[0141] During the Fig. 1 bis 7 In the illustrated embodiments, the fixing means 14 has clamping arms 19. The clamping arms 19 can, in particular, be elastic or spring-loaded and / or made of an elastic material. The clamping opening 15 can be formed by the clamping arms 19.

[0142] Fig. 6 This shows that the fixing means 14 has at least two clamping arms 19. In the illustrated embodiment, three clamping arms 19 are provided.

[0143] At the in Fig. 19 In the illustrated embodiment, no clamping legs 19 are provided to form the clamping opening 15. The clamping opening 15 is ultimately formed by a cross-sectional narrowing of the fixing element 14, whereby the fixing element 14, due to its elastic properties, leads to the clamping of the fusible link 3.

[0144] The in Fig. 6 The clamping legs 19 shown are designed to be elongated and directed towards the center of the insulating body 2.

[0145] The Fig. 6 The figure also shows that the fixing element 14 has external clamping ribs 20, which are elongated in the direction of the longitudinal axis of the insulating body 2. The clamping ribs 20 are designed to be resilient and / or elastically deformable. In addition, the clamping ribs 20 can be provided for frictional engagement with the inside of the insulating body 2.

[0146] In the Fig. 19 bis 21 The fixing agent 14 shown is a plug, in particular a lamellar plug. The plug has two lamellae that form the clamping ribs 20. The in Fig. 19 The clamping ribs 20 shown extend radially from the center point of the fixing element 14. Furthermore, the in Fig. 19 The clamping ribs 20 shown are formed in cross-section at least essentially in an annular shape.

[0147] The Fig. 6 Figure 1 shows that the clamping ribs 20 enclose the clamping legs 19. A gap is provided between the clamping ribs 20 and the clamping legs 19. Preferably, the clamping legs 19 allow the clamping opening 15 to be arranged at least substantially centrally in the insulating body 2. The clamping ribs 20, in turn, serve to bear against the inner wall of the insulating body 2, which faces the clamping ribs 20.

[0148] In the Fig. 8 bis 13 Another embodiment of the fixing device 8 is shown.

[0149] In this embodiment, the fixing device 8 has two clamping openings 15. The clamping openings 15 also serve to guide and fix the fusible link 3. The fixing device 18 also has an elastic material.

[0150] The fixing device 8 is also designed as an elongated, in particular one-piece, sleeve body. The sleeve body is inserted into the insulating body 2 at least partially, and in the illustrated embodiments completely. In addition, the sleeve body 2 can be arranged in the insulating body 2 by friction fit.

[0151] The length 21 of the sleeve body can correspond at least substantially to the length 13 of the insulating body 2.

[0152] Furthermore, the Fig. 13 that the sleeve body has elongated through-openings 22. The through-openings 22 can in particular be designed as openings and can extend over the entire length 21 of the fixing device 8 or of the sleeve body.

[0153] The through-openings 22 can, in particular, improve or enable the elastic properties of the fixing device 8. In particular, compression or squeezing of the through-openings 22 can ensure the friction-fit arrangement of the fixing device 8 in the insulating body 2.

[0154] In the illustrated embodiment, a plurality of through-openings 22 are provided, in particular wherein the number of through-openings 22 is between 2 and 10.

[0155] The Fig. 14 - the top view of the in Fig. 13 The depicted fixing device 8 shows - clarifies that the through-openings 22 are at least essentially equally spaced from each other.

[0156] The Fig. 9 and 10The clamping device 8, designed as a sleeve body, has a chamber 23 between the two clamping openings 15 that is wider than the clamping openings 15. In particular, the chamber 23 can be filled with, or is filled with, an extinguishing agent, preferably extinguishing sand, granules and / or glass beads. The melting conductor 3 can be arranged centrally, preferably in a centered position, in the chamber 23 by means of the clamping device 8.

[0157] Chamber 23 may be at least partially filled with the extinguishing agent. In particular, insulating body 2 is partially filled and / or completely filled with the extinguishing agent.

[0158] In the illustrated embodiment, it is provided that the chamber 23 is located in the Fig. 10 The cross-section shown has at least the essential shape of an octagon.

[0159] Fig. 9 However, it shows that the chamber 23 can be formed in particular by a central area, preferably cylindrical, and two connection areas adjacent to the clamping openings 15, which are preferably frustoconical.

[0160] Ultimately, chamber 23 can taper towards the clamping openings 15.

[0161] The Fig. 9 Figure 8 shows that the fixing device 8 has an outer insertion area 24 that is wider than the clamping opening 15. The insertion area 24 opens into the clamping opening 15. Furthermore, the insertion area 24 is located in the area of ​​the respective end faces 5, 6 of the insulating body 2.

[0162] Furthermore, it shows Fig. 9 , that the insertion area 24 may have an insertion opening 25 which is provided in the area of ​​the respective end face 5, 6 of the insulating body 2.

[0163] The fusible link 3 is ultimately inserted into the fixing device 8 via the insertion opening 25.

[0164] The insertion area 24 also has insertion ramps 26, which taper particularly towards the clamping opening 15.

[0165] Even those in the Fig. 1 and 2 The illustrated embodiment shows an insertion area 24 that extends both over the outer area 16 and preferably at least partially over the inner area 17. The insertion area 24 has an insertion opening 25. Furthermore, insertion ramps 26 are also provided, which open into the clamping opening 15.

[0166] The in Fig. 16 The depicted fixing means 14 also have an insertion area 24. The insertion area 24 is wider than the clamping opening 15 and leads in particular into an insertion opening 25. The insertion opening 25 is spaced apart from the end face 5, 6 of the insulating body 2. Finally, the fusible link 3 can be inserted into the insulating body 2 via the insertion opening 25.

[0167] The Fig. 1 , 8 and 15 This demonstrates that in the (finished) final state of the fuse 1, the insertion opening 25 is at least substantially completely covered by the outer contact cap 4. This prevents unwanted tampering with a finished fuse 1.

[0168] The in the Fig. 19 bis 21 The fixatives 14 shown comprise and / or consist of an electrically insulating plastic, in particular an elastomeric plastic, preferably silicone, natural rubber, silicone rubber and / or synthetic rubber.

[0169] Furthermore, the in Fig. 13 The fixing device 8 shown is made of or consists of an elastomeric plastic.

[0170] It is not shown that the fixing device 8 and / or the fixing medium 14 has and / or consists of an electrically conductive material, in particular metal and / or a metal alloy.

[0171] Not shown is that the outer contact cap 4 may be electrically connected to the fusible link 3 via the fixing agent 14 and / or via the fixing device 8.

[0172] In Fig. 21 A schematic perspective view of the fixing agent 14 shows that the fixing agent 14 has a further opening 27. This further opening 27 can be designed, in particular, to allow the insulating body 2 to be filled with an extinguishing agent, especially extinguishing sand, granules, and / or glass beads. The insulating body 2 can be completely or partially filled with the extinguishing agent.

[0173] The in Fig. 21 The further openings 27 shown are designed in particular as openings for the fixing agent 14. In addition, a plurality of further openings 27 are also provided, in particular between 2 and 20.

[0174] The further openings 27 can be spaced apart, in particular, from the clamping opening 15.

[0175] The in the Fig. 2 and 9 The depicted fixing devices 8 have no further openings 27. In further, to which the Fig. 2 and 9 However, in embodiments based on the illustrated embodiment, further openings 27 may be provided.

[0176] The Fig. 13 und 14 show that the fixing device 8 has clamping lugs 28. The clamping lugs 28 can be arranged on the outer surface of the fixing device 8, which is designed as a sleeve body, facing the inner wall of the insulating body 2. Fig. 14 shows that a plurality of clamping ribs 28 are provided, which are preferably spaced at least substantially equally apart from each other.

[0177] In the illustrated embodiment, the clamping web 28 has a cross-sectional shape that is at least substantially triangular. In further embodiments, however, the clamping web 28 can also have other cross-sectional shapes – such as a rectangular cross-sectional shape.

[0178] The Fig. 13 Figure 1 shows that the clamping web 28 projects from the outer surface of the fixing device 8. In the illustrated embodiment, the clamping web 28 extends at least substantially over the length 21 of the fixing device 8.

[0179] The Fig. 9 and 12The clamping rib 28, when in use, contributes to the frictional engagement between the insulating body 2 and the fixing device 8. This allows the clamping rib 28 to abut the inner wall of the insulating body 2. Preferably, the clamping rib 28 comprises an elastically deformable material. Furthermore, the clamping rib 28 can also space the outer surface of the fixing device 8 away from the inner wall of the insulating body 2.

[0180] Even those in the Fig. 1 bis 7 The illustrated embodiment has clamping webs 28. Fig. 6 shows that the clamping ribs 28 can be arranged on the clamping ribs 20.

[0181] When installed, the clamping ribs 28 can space the clamping ribs 20 away from the inner wall of the insulating body 2 or contribute to the frictional connection between the insulating body 2 and the clamping ribs 20.

[0182] To achieve the frictional connection, it can be provided that the width and / or diameter of the clamping opening 15 in the unloaded state is smaller than the width and / or diameter of the fusible link 3.

[0183] The Fig. 1 , 8 and 15 show that the outer contact caps 4 are arranged on the outside of the respective end face 5, 6 of the insulating body 2.

[0184] The Fig. 22 und 23 illustrate that the outer contact caps 4 are designed to be plugged onto the insulating body 2.

[0185] The insulating body 2 can also be connected to the outer contact caps 4 by crimping. Alternatively or additionally, it can also be provided that the outer contact caps 4 are bonded to the insulating body 2 by a material bond.

[0186] The outer contact caps 4 ultimately enable the electrical contact of the fuse link or the fuse 1. Accordingly, the contact caps 4 have an electrically conductive material, in particular metal, and / or consist of it.

[0187] It is not shown in detail that the outer contact cap 4 is bonded to the insulating body 2 via an adhesive and / or a bonding agent 29.

[0188] In the Fig. 1 The schematic representation shows that the respective end-side area 10, 11 of the fusible link 3 is electrically connected to the respective outer contact cap 4 via an electrically conductive connecting element 29.

[0189] The connecting element 29 is arranged in the insertion area 24 of the fixing element 14 or the fixing device 8.

[0190] Even the Fig. 8 illustrates that a connecting element 29 is used which electrically connects the end area 10, 11 of the fusible link 3 to the respective outer contact cap 4.

[0191] A solder joint and / or a conductive, in particular lead-free, adhesive can be provided as the connecting element 29.

[0192] In addition, the connecting element 29 can enable a material connection between the outer contact cap 4 and the fixing device 8 and / or the insulating body 2.

[0193] The connecting element 29 can be arranged partially or completely within the insertion area 24. Ultimately, the connecting element 29 enables at least an electrical contact between the outer contact cap 4 and the fusible link 3.

[0194] In particular, the connecting element 29 does not penetrate or creep through the clamping opening 15 into the inner area of ​​the insulating body 2, or preferably does not penetrate the clamping opening 15.

[0195] The connecting element 29 connects the fusible conductor 3 in the end area 10, 11 to the fixing device 8 and / or the fixing element 14 - in addition to the frictional connection - by means of a material bond.

[0196] The Fig. 8 shows that the fixing device 8 is completely arranged in the insulating body 2.

[0197] At the in Fig. 15 In the illustrated embodiment, however, it is provided that the fixing device 8 is only partially arranged in the insulating body or extends into it and in particular also projects beyond or beyond the insulating body 2.

[0198] The Fig. 1 , 8 and 15show that the fixing agent 14 and / or the insertion opening 25 is at least substantially completely covered by the outer contact cap 4.

[0199] It is not shown in detail that the insulating body 2 has and / or consists of an electrically insulating material, in particular a material comprising a glass and / or ceramic compound.

[0200] Furthermore, it is not shown that the insulating body 2 is filled with an extinguishing agent, in particular extinguishing sand, granules and / or glass beads, at least in the inner area.

[0201] The Fig. 24 Figure 1 shows a schematic sequence of a method for manufacturing a fuse 1. In particular, the method is used to manufacture a fuse 1 according to one of the previously described embodiments. This allows for the production of an SMD fuse and / or a device protection fuse.

[0202] The Fig. 24 The diagram shows process steps A to E, which are carried out sequentially in the schematic sequence shown. It should be understood that a different sequence of individual process steps – at least with regard to the chronological order – is also possible.

[0203] At the in Fig. 24 In the illustrated embodiment, step A provides for an insulating body 2, a fusible link 3, a fixing device 8 and outer contact caps 4.

[0204] In step B, the fixing device 8 is inserted into the insulating body 2 – at least partially. In particular, step B provides that the fixing device 8 is connected to the insulating body 2 by at least friction. Preferably, there is a frictional connection between the inner region 17 of the fixing device 8 and the insulating body 2.

[0205] In step C, after the insertion of the fixing device 8 into the insulating body 2, the fusible link 3 is frictionally fixed in the fixing device 8. The fixing is carried out in such a way that the fusible link 3 is arranged in the insulating body 2, in particular in a positionally stable and / or centered manner.

[0206] After the introduction of the fusible link 3, step D provides for the electrical connection of the outer contact caps 4 to the fusible link 3. For example, an electrically conductive connecting element 29 can be used for this connection.

[0207] Finally, step E provides for the outer contact caps 4 to be placed onto the insulating body 2. It is understood that step E can also be carried out simultaneously with step D. The outer contact caps 4 can be connected to the insulating body 2, in particular by crimping. Alternatively or additionally, the outer contact caps 4 can also be bonded to the insulating body 2 by a material bond.

[0208] It is not shown in detail that in step C, the fusible link 3 can be inserted using a tool, preferably a feed needle. The tool can be inserted into the fixing device 8, in particular to widen or open the clamping opening 15. The fusible link 3 is inserted into the fixing device 8 simultaneously with the tool. Furthermore, the tool, together with the fusible link 3, can first be guided through the clamping opening 15 via the insertion area 24, in particular along the insertion ramps 26. The fusible link 3 can then be pulled through the insulating body 2 and thus reach the further clamping opening 15.

[0209] Before or after the insertion of the fusible link 3 into the insulating body 2, the insulating body 2 can be filled, particularly in its inner central region, with an extinguishing agent, preferably extinguishing sand. Accordingly, the insulating body 2 can be filled, preferably partially, with extinguishing agent, particularly after step C and before step D. In addition to extinguishing sand, granules and / or glass beads are also provided in further embodiments.

[0210] After the insertion of the fusible link 3, the connecting element 29 for electrical contacting the fusible link 3 can be inserted into the insertion area 24. The connecting element 29 can also enable a material connection between the fusible link 3 and the fixing device 8.

[0211] In this context, it is understood that the fusible link 3 can be fixed in the clamping openings 15 by at least two fixing points. These fixing points can be located in the respective end regions 10 and 11. The fixing points do not necessarily have to be the outer ends of the fusible link 3. For example, the fusible link 3 can have a central region 9 adjacent to the end regions 10 and 11.

[0212] By fixing the fusible link 3 in the fixing device 8, the fusible link 3 can be arranged in the insulating body 2 in a positionally stable manner, in particular centered, at at least two fixing points. Bezugszeichenliste:

[0213] 1 Fuse 2 Insulator 3 Fusible link 4 Outer contact cap 5 End face 6 End face 7 Sheath surface 8 Fixing device 9 Center area of ​​3 10 End area of ​​3 11 End area of ​​3 12 Length of 3 13 Length of 2 14 Fixing means 15 Clamping opening 16 Outer area 17 Inner area 18 Stop 19 Clamping leg 20 Clamping rib 21 Length of 8 22 Through opening 23 Chamber 24 Insertion area 25 Insertion opening 26 Insertion ramp 27 Further opening 28 Clamping bridge 29 Connecting means

Claims

1. Fuse (1), in particular SMD fuse and / or device protection fuse, with an insulating body (2), a fusible link (3) arranged in the insulating body (2) and outer contact caps (4) placed on the insulating body (2) and electrically connected to the fusible link (3), characterised in that the fusible link (3) is fixed at least by friction in the insulating body (2) by means of a fixing device (8) to ensure that it remains in position, in that the fixing device (8) is designed such that the fusible link (3) is clamped at least at one end area (10, 11), in that the fixing device (8) comprises two fixing means (14) each assigned to an end area (10, 11) of the insulating body (2), wherein the fixing means (14) comprising an elastic material has a clamping opening (15) for passing through and fixing the fusible link (3).

2. Fuse according to claim 1, characterised in that the fixing device (8) is connected to the insulating body (2) at least by friction.

3. Fuse according to claim 1 or 2, characterised in that the fixing means (14) comprises an outer area (16) arranged outside the insulating body (2) and an inner area (17) adjoining the outer area (16) for insertion into the insulating body (2), in particular wherein the inner area (17) is friction-locked in the insulating body (2) and / or in particular wherein the outer area (16) is separated from the inner area (17) by a stop (18) which is designed to rest on the front side (5, 6) of the insulating body (2).

4. Fuse according to one of the preceding claims, characterised in that the fixing means (14) has at least two, preferably three, elastic and / or spring-loaded clamping legs (19) for fixing the fusible link (3) and / or that the fixing means (14) has outer, preferably spring-loaded and / or elastically deformable clamping ribs (20) for friction-locking arrangement in the insulating body (2).

5. Fuse according to one of the preceding claims, characterised in that the fixing device (8) is designed as an elongated, in particular one-piece, sleeve body, in particular wherein the sleeve body is inserted into the insulating body (2) at least in some areas, preferably completely, and / or friction-locked, in particular wherein the length of the sleeve body corresponds at least substantially to the length (13) of the insulating body (2) and / or in particular wherein the sleeve body comprises elongated through openings (22) which preferably extend over the length of the sleeve body.

6. Fuse according to one of the preceding claims, characterised in that the fixing device (8) designed as a sleeve body comprises a chamber (23) between two clamping openings (15) which is widened relative to the clamping openings (15), in particular wherein the chamber (23) is filled with extinguishing agent.

7. Fuse according to one of the preceding claims, characterised in that the fixing means (14) and / or the fixing device (8) comprises an outer insertion area (24) widened relative to the clamping opening (15), in particular wherein the insertion area (24) opens into the clamping opening (15) and / or in particular wherein the insertion area (24) faces the front side (5, 6) of the insulating body (2) and preferably forms an insertion opening (25) in the region of the front side (5, 6) of the insulating body (2).

8. Fuse according to one of the preceding claims, characterised in that the fixing device (8) and / or the fixing means (14) comprises an electrically insulating material, preferably plastic, in particular an elastomeric plastic, in particular silicone, natural rubber, silicone rubber and / or synthetic rubber, and / or is made thereof.

9. Fuse according to one of the preceding claims, characterised in that the fixing device (8) and / or the fixing means (14) comprises an electrically conductive material, in particular metal, and / or is made thereof.

10. Fuse according to one of the preceding claims, characterised in that the fixing device (8) and / or the fixing means (14) comprises at least one further opening (27), preferably for filling with extinguishing agent.

11. Fuse according to one of the preceding claims, characterised in that the respective end area (10, 11) of the fusible link (3) is electrically connected to the respective outer contact cap (4) via an electrically conductive connecting means (29), in particular wherein the connecting means (29) is arranged at least in part in the insertion area (24) of the fixing means (14) and / or the fixing device (8) and / or in particular wherein the connecting means (29) is designed as a solder connection and / or as a conductive adhesive.

12. Fuse according to one of the preceding claims, characterised in that the fixing means (14) and / or the fixing device (8) electrically connects the fusible link (3) to the respective outer contact cap (4).

13. Method for manufacturing a fuse (1), in particular an SMD fuse and / or device protection fuse, according to one of the preceding claims, wherein the method comprises the following method steps: A) Providing an insulating body (2), a fusible link (3), a fixing device (8) and outer contact caps (4); B) Inserting the fixing device (8) into the insulating body (2); C) Inserting the fusible link (3) into the insulating body (2) through the fixing device (8) and friction-locking the fusible link (3) in the fixing device (8) so that the fusible link (3) is arranged in a positionally stable manner in the insulating body (2), wherein the fusible link (3) is clamped at least at one end area (10, 11) by the fixing device (8), wherein the fixing device (8) comprises two fixing means (14) each assigned to an end area (10, 11) of the insulating body (2), wherein the fusible link (3) is passed through a clamping opening (15) of the fixing means (14) comprising an elastic material and is fixed in this clamping opening (15); D) Electrically connecting the outer contact caps (4) to the fixed fusible link (3); E) Placing the outer contact caps (4) on the insulating body (2).

Images