EP0905839A1 - Pluggable surge arrester - Google Patents

Abstract

The conductor includes a lower part (22) with contact receptions (23), an upper part (24) with contact pins (9) inserted into the contact receptions, and an over-voltage conductor element (1), preferably a variable resistor, arranged between the contact pins. A pre-stressed supply part is formed through a bridge, whose both ends (81,82) are connected over soldering points with further supply parts (11). The conductor includes a lower part with contact receptions, an upper part (24) with contact pins (9) inserted into the contact receptions, and an over-voltage conductor element (1), preferably a variable resistor, arranged between the contact pins. At least one soldering point (25) is arranged in the supply to the over-voltage conductor element, whereby one of the soldered supply parts (8) is connected with a spring (2), pre-stressing the supply part (8) in direction away from the soldering point. The pre-stressed supply part is formed through a bridge, whose both ends (81,82) are connected over soldering points with the other supply parts.

Description

The invention relates to a pluggable surge arrester comprising a lower part Contacts and a top with insertable into the contacts Contact pins and with one arranged between these contact pins Surge arrester element, preferably varistor, being in the feed line to Surge arrester element is arranged at least one solder joint, in which one of the soldered lead parts with one, this lead part in the direction away from the solder joint biasing spring is connected.

Transient overvoltages, e.g. caused by lightning strikes, have relatively large Energies and can cause damage to electrical systems. It is therefore necessary protective measures with which such overvoltages are derived can provide. Voltage-dependent components are suitable for this, i.e. those that a large one at low voltages and a small one at high voltages Have resistance, e.g. Varistors, suppressor diodes, spark gaps. This Components are simply placed between the two conductors whose voltage is monitored should be switched.

When the normal operating voltage is applied, the arrester acts (with the exception of one low leakage current) like an interruption, however, if an overvoltage is present like a short circuit so that the line voltage is considerably reduced and the Surge energy is largely conducted through the arrester.

If such a derivation leads to excessive discharge energies, these are the ones that have the maximum Energy absorption capacity of the arrester exceed, occur, lead to this Damage to the arrester. As a result, it also points in the normal operating state, i.e. when the normal mains voltage is present, a low resistance, so that continuously an impermissibly high current flows over it.

To avoid such fault currents, they become surge arresters in series Devices switched that a complete and permanent separation of a defective and therefore cause the arrester to be replaced from the network.

One of the most common such devices has a inside the housing of the Surge arrester lying, movable round rope, which is electrically in series to Surge arrester is switched by the two sections of the in the housing specified supply line to the arrester electrically connects. This round rope is with one end is permanently connected to the first lead section, e.g. riveted or welded and has a permanently fixed at its second end - also with the Round rope welded or riveted plate made of conductive material, usually Copper, on. This plate is soldered to the second lead section and spring-loaded in such a way that it is biased in the direction away from the solder joint is.

Both a leakage current caused directly by the overvoltage and a line follow current which arises when the arrester is defective causes the Arrester. This heat spreads through the electrical supply lines and thus arrives also in the solder joint. The melting point of the solder becomes during this heating process reached, the plate attached to the round rope can be reached by the spring force from the soldering point be torn loose, whereby the surge arrester is separated from the mains with one pole.

A solder with a precisely defined melting point is used in said soldering point. This melting point is chosen so that it corresponds to thermal energy that the arrester just can still take up undamaged, is not yet reached. The solder connection remains as long as the surge arrester is still undamaged, intact, but will be larger Thermal energies solved.

However, this previously known round rope solution has the considerable disadvantage of a high one Surge current sensitivity. A round rope used here must have a large number interwoven thin individual wires exist so that there is one for the just explained Movement has sufficient flexibility. With high surge currents, this causes Magnetic forces that occur lead to contractions leading to the tearing off of these individual wires. The round cable is therefore destroyed in the event of overcurrents that can be absorbed by the arrester, it in summary there is a false trigger. In addition, such a round rope is relative expensive, which leads to high manufacturing costs of the entire diverting element.

According to another known solution, which is based on the same principle of operation instead of the round rope a copper plate is used, which in turn with its first End permanently connected to the first lead section and to its second Section is soldered to the second lead section. Works on this copper plate a spring at a distance from its first end, which the plate after solving the Bends the solder joint away from it.

In order to enable this bending of the copper plate, it must be made of a correspondingly thin layer Copper sheet are made. As a result, however, it has a small cross section a relatively high resistance and thus a correspondingly strong warming Current flow, which already at low current and exposure time Melt the plate. Analogous to the round rope solution is a small one Given surge current resistance.

It is also known to use a leaf spring instead of the copper plate, which by itself already has a bias pointing away from the solder joint and therefore without the action of an additional spring when loosening the solder joint with its second end moved away from the solder joint.

Materials suitable for the production of leaf springs, e.g. Steel, have a relatively high specific resistance, so that here too the problem of low Surge current resistance results.

It is therefore an object of the invention to provide a pluggable surge arrester Specified type to specify, which in particular with a simple, functionally reliable structure is insensitive to surge currents.

According to the invention this is achieved in that the spring-biased supply part a bridge is formed, the two ends of which are connected to the further supply parts via solder joints are connected.

This solution comes completely without a flexible, bendable or resilient supply part and the related problems discussed above. The movable supply part is rigid in itself and can therefore with a relatively large cross-section and made of highly conductive material how copper is made. The surge current resistance of the movable lead part is therefore particularly high.

In addition, two interruption points are provided here, making one particularly safe disconnection of the surge arrester from the network is effected. Next to it is too the separation process itself can be carried out particularly quickly and reliably, it can namely, form two arcs connected in series. These have a higher Maintenance voltage as just an arc (like the state-of-the-art solutions) and go out earlier.

In a further development of the invention it can be provided that the bridge in cross section seen is double L-shaped.

The two feed sections connected by the bridge can thus be relatively wide be arranged apart, but such a bridge must only a comparatively small path from the closed to the open position return.

Another feature of the invention may be that the bridge unites at one end preferably has in one piece with the bridge web on which the spring is set.

Coil springs, as will be explained below, are a particularly preferred Represent embodiment of the spring, are particularly simple on such webs Attach their end fixable.

In a further embodiment of the invention it can be provided that the first end of the bridge is soldered to a contact pin.

So that the supply line comes with the minimum possible number of individual parts, namely Contact pin, bridge and connection to the surge arrester, which is the supply line as far as possible in one piece, which means that the production is complex and Connection points impairing conductivity can be avoided.

Furthermore, it can be provided that the spring by a coil spring, preferably by a tension spring is formed.

Such springs can be easily and with small dimensions for the sufficient forces according to the invention are produced.

According to a particularly preferred embodiment of the invention, that the bridge is arranged immediately adjacent to the bottom plate of the upper part, that the Base plate in the movement area of the bridge has an opening and that in the The base of the lower part is a pivoting rocker that actuates an auxiliary contact is provided, which in the idle state when the upper part is fully inserted Breakthrough penetrates and through the bridge during its opening movement is pivotable.

The release of the bridge and the need to replace it defective top can be very easily in such an embodiment electrical signal to be converted.

In this context it can further be provided that the bridge in the open Condition the opening at least in the area of the one in the rest position Rocker covered.

It is therefore not possible to insert an already defective upper part into a lower part because in this attempt the rocker of the lower part strikes the bridge and thereby a complete insertion of the upper part prevented.

Another feature of the invention may be that the seesaw with one towards it is connected to its rest position prestressing elastic component.

This automatically resets the rocker to its idle state as soon as the defective upper part is removed from the lower part.

In this connection it can further be provided that the elastic component is the rocker biased in both directions of pivot towards the rest position.

So the lower part does not require any specific direction of movement of the bridge, each Swiveling the rocker can be reversed.

It can be particularly inexpensive to move the elastic component about the pivot axis to form the torsion spring running around, because such a one is special has a small footprint and can also be installed particularly easily.

In this context, a particularly preferred embodiment of the invention provide that the torsion spring is formed by a coil spring, the two ends of which run parallel to the swivel axis and on the side surfaces of the rocker and on these side surfaces are aligned with stops formed on the lower part.

Coil springs are particularly easy to manufacture with the spring forces required here, moreover, the form-fitting contact of the two spring ends against stops of the lower part the spring is only used in the intended place in the lower part however, in addition to that. A corresponding step in the manufacturing process can therefore be omitted.

A further particularly preferred embodiment can have an optical defect display comprising an opening arranged in the front of the upper part and an in Have inside the upper part movably mounted lever, which extends from the area of Breakthrough extends into the path of movement of the bridge and its first, in the area the opening located end carries a signal plate, which signal plate on its surface facing the opening with an "OFF" operating state typical marking is provided, which marking by means of the bridge at their Lever movement caused by an opening movement not through the opening can be brought into a visible position or which signal plate is on it the surface facing the opening with an operating state "ON" typical marking is provided, which marking by means of the bridge at their Opening movement of a lever movement caused by the opening can be brought into a non-visible position.

With such a display, the state of the arrester can be simple and in for everyone understandable form. The simple mechanical structure guarantees Operational reliability.

A preferred embodiment of this embodiment can provide that the lever is pivoted and that the marking typical for the operating state "OFF" of the signal plate in the closed state of the bridge below the Breakthrough adjacent area of the end face and by means of the bridge their opening movement caused lever pivoting under the breakthrough is pivotable or that the marking of the operating state "ON" of the Signal plate is in the closed state of the bridge under the breakthrough and by means of lever pivoting caused by the bridge during its opening movement is pivotable under the area of the end face adjacent to the opening.

In order to realize the defect display, this construction method comes with a single one additional component, namely the lever itself. By using only one Component are low mechanical friction and thus functional reliability as well low manufacturing costs ensured.

In this context, a further feature of the invention can be that Below the signal plate attached to the lever, another, immobile in the upper part fixed tile is provided.

This means that the operating status in which the signal plate is invisible is also clear corresponding design of the specified tile can be displayed.

According to another embodiment, it can be provided that the signal plate both with one for the operating state "ON" and one for the operating state "OFF" typical marking is provided.

This allows the plate fixed immovably in the upper part, which as an additional Component requires additional manufacturing costs to be saved.

It can be advantageous that the second, in the path of movement of the bridge extending end of the lever has a notch in which the web of the bridge engages, because this locks the lever with the bridge and the bridge itself locks it in Rest position held. Any necessary separate components can be saved become.

Fig.1a,b eine erste Ausführungsform eines Oberteiles eines erfindungsgemäßen Überspannungsableiters in Auf- und Seitenriß, jeweils mit abgenommender Oberschale bzw. Seitenwandung;

Fig.1c,d eine zweite Ausführungsform des Oberteiles in derselben Darstellung wie Fig. 1a,b;

Fig.2a eine besonders bevorzugte Ausführungsform des Oberteiles im Aufriß bei abgenommener Oberschale;

Fig.2b den Oberteil nach Fig.2a im Seitenriß;

Fig.2c den Schnitt entlang der Linie A-A durch den Oberteil nach Fig.2a,b;

Fig.2d den Oberteil nach Fig.2b in derselben Darstellung mit einer weiteren Ausführung der optischen Defektanzeige;

Fig.3 den Oberteil nach Fig.2 eingesetzt in einen Unterteil im Aufriß, wobei die Oberschalen von Ober- und Unterteil abgenommen sind;

Fig.4a,b,c den Unterteil nach Fig.3 im Aufriß bei abgenommener Oberschale, im Seitenriß und im Grundriß;

Fig.4d die in diesem Unterteil angeordnete Wippe im Detail;

Fig.4e die Detaildarstellung nach Fig.4d mit einer besonders bevorzugten Ausgestaltungsweise der die Wippe in Richtung ihrer Ruhelage vorspannenden Torsionsfeder und

Fig.5a,b zwei mögliche Ausführungsformen des den Hilfkontakt beinhaltenden Schaltgerätes.

The invention is described below with reference to the accompanying drawings, in which particularly preferred embodiments are shown. It shows:

1a, b show a first embodiment of an upper part of a surge arrester according to the invention in elevation and side elevation, in each case with a removed upper shell or side wall;

1c, d a second embodiment of the upper part in the same representation as FIG. 1a, b;

2a shows a particularly preferred embodiment of the upper part in elevation with the upper shell removed;

2b shows the top part according to FIG. 2a in side elevation;

2c shows the section along the line AA through the upper part according to FIG. 2a, b;

2d shows the upper part according to FIG. 2b in the same representation with a further embodiment of the optical defect display;

3 the upper part according to FIG. 2 inserted into a lower part in elevation, the upper shells of the upper and lower part being removed;

4a, b, c the lower part according to FIG. 3 in elevation with the upper shell removed, in side elevation and in plan;

4d shows the rocker arranged in this lower part in detail;

4e shows the detailed representation according to FIG. 4d with a particularly preferred embodiment of the torsion spring which prestresses the rocker in the direction of its rest position

5a, b show two possible embodiments of the switching device containing the auxiliary contact.

Components of surge arresters, e.g. Varistors, suppressor diodes or the like can by the electrical energies carried over them during a discharge. It is therefore convenient to close them like overcurrent fuses built-in protective circuit that they can be replaced easily. Similar to fuses, you can see one permanently with the circuit connected lower part 22, which is provided with contacts 23. The Surge arrester element 1 itself, which is preferred in the present invention is formed by a varistor, is arranged in an upper part 24. This points in said Contacts 23 of the lower part 22 insertable contact pins 9, with which Contact pins 9, the surge arrester element 1 is connected. Of the Surge arrester can thus be plugged in and out of the circuit and thus on particularly simple, interchangeable also by laymen.

Around this pluggable surge arrester, usually mounted in switch boxes optically to the other switch box devices, such as circuit breakers, RCCBs and the like. To adapt, the lower part 22 is U-shaped and the upper part 24 is cuboid (see Fig. 4). However, these geometric shapes are not essential to the invention and can be modified as required.

To the surge arrester element 1 immediately after its defect and separate from unplugging the upper part 24 from the network is within the Upper part 24 in the supply line to the surge arrester element 1 at least one Arranged solder joint 25, in which one of the soldered lead parts 8, 11 with a this lead part 8 in the direction away from the solder joint 25 biasing spring 2 connected is. As already explained at the beginning, this solder joint 25 is made both by Leakage currents as well as system follow currents due to a defect in the Surge arrester element 1 is heated and the spring-biased supply part 8 is added Reached the solder melting point torn from the solder joint 25, which is a separation of the Surge arrester element 1 from the network results.

According to the invention, the spring-biased supply part 8 is provided by a To form a bridge, the two ends 81,82 via solder joints 25 with the others Lead parts 11 is connected. A first possibility of the concrete design of this Principle is shown in Fig.1a, b. The one shown here, designated 24 in its entirety Upper part has a box-like lower shell 4, within which the Surge arrester element 1, the contact pins 9 and the leads 10, 11 are arranged are. This lower shell 4 is closed with a plate-shaped upper shell 7, which however, to better illustrate the invention in all elevation views of the top 24 was omitted.

The bridge 8 is a flat plate, the first end 81 directly with the first Contact pin 9 and its second end 82 to the first connection of the Surge arrester element 1 continuing supply part 11 is soldered. The Soldering the bridge 8 directly to the contact pin 9 is inexpensive because electrical lines can be saved. However, it is within the scope of the invention, the contact pin 9 to be firmly connected to a supply part, e.g. to weld, and the bridge 8 only with to solder this additional lead part. The as coil spring and functional as Tension spring formed spring 2 is on the one hand on a pin-shaped projection 3 Lower shell 4 and on the other hand fixed with a web 83 formed on the bridge 8 and thereby biases the bridge 8 in the direction normal to the direction of insertion of the upper part 24. After heating the solder joints 25 up to or beyond their melting points the bridge 8 would be moved in the biasing direction of the spring 2 and next to the contact pin 9 and supply part 11 come to rest.

Another possible design and arrangement of the bridge 8 shows Fig.1b, c. Here, the bridge 8 is double L-shaped in cross section; Contact pin 9 and Lead part 11, with which it is soldered, are arranged offset in height from each other. The spring 2 is arranged in the insertion direction of the upper part 24 so that the Direction of movement of the bridge 8 is normal to that of Fig.1a, b.

In both of these embodiments, the one used to disconnect the surge arrester 1 performed movement of the bridge 8 to control an optical Defect indicator used. This includes one in the end face 26 of the upper part 24 arranged opening 27 and a movable inside the upper part 24 mounted lever 5, which extends from the area of the opening 27 into the Path of movement of the bridge 8 extends. At its first, in the area of the opening 27 located end he carries a signal plate 50, the 27 on the opening facing surface with a marking 53 typical of the “OFF” operating state is provided. This marking 53 extends over the entire, approximately the size of Surface of the signal plate 50 having an opening 27.

The opening movement of the bridge 8 is transmitted to the lever 5, which is both after Fig.1a and Fig.1c done in that the lever 5 rests directly on the bridge 8. The marking 53 typical of the “OFF” operating state is thereby replaced by a through the Opening 27 not brought into a visible position. As for the Marking 53 typical of operating state “OFF”, for example, there is a red coat of paint, Inscriptions such as "broken, defective" or similar in question.

Making the marking 53 of the signal plate visible so far only in the abstract 50 takes place in Fig.1a specifically by a corresponding pivoting of the lever 5. This is for this purpose, pivotably mounted around the pin-shaped projection 51 of the lower shell 4 and so shaped that the signal plate 50 in the closed state of the bridge 8 below the opening 27 adjoining the end face 26 comes to rest. Through the Opening movement of the bridge 8 becomes the second one, in the range of movement of the bridge 8 extending end of the lever 5 pivoted clockwise and thereby shifts the Signal plate 50 under the breakthrough 27. Advantageously, the second is to the movement path of the bridge 8 extending end of the lever 5 with a notch 52nd provided, in which a further molding 84 of the bridge 8 engages.

Below the signal plate 50 is another, fixed immovably in the upper part 24 Plate 6 provided. In the operational state of the upper part 24, in which the Signal plate 50 is invisible, is through the opening 27 this plate 6th visible. This can be done with a marking 54 typical for the operating state "ON", such as green paint, the words "ON, OK, GOOD" or the like.

In Fig.1c, the optical defect display has a different function: the lever 5 is not pivotally mounted here, but rather displaceable in the direction of movement of the bridge 8. The signal plate 50 is always in alignment below the opening 27, only to be Distance to the opening 27 is reduced by the bridge movement. To do that Plate 50 and thus the marker 53 is still invisible in the idle state of the bridge 8 to keep are between him and the opening 27 opaque, elastic tabs 28 arranged, the only at their ends facing away from the signal plate 50 in the upper part 24 are set. When the bridge 8 is moved, the signal plate 50 is moved by it Flap 28 pushed through and is the typical for the operating state "OFF" Marking 53 can be seen through the opening 27.

The marking 54 typical of the "ON" state is in this construction on the to attach elastic cloth 28.

The embodiment of the invention according to FIGS. 2 to 4 is a special one preferred. The bridge 8 is - as can best be seen from FIG. 2c - again double L-shaped executed and soldered to contact pin 9 and lead part 11. Your longitudinal axis as well the spring 2 are normal to the direction of insertion of the upper part 24 and direct arranged adjacent to the base plate 29 of the upper part 24 (see FIGS. 2a and 3). The for bridge-side fixing of the spring 2 provided web 83 is at the second end 82 of the Bridge 8 arranged and executed in one piece with this.

The optical defect display is almost identical to that of Fig.1a, so that again Explanation of its functioning is omitted. Differences to Fig.la can be found in following two points: Firstly, the one used to determine spring 2 applies Web 83 in the notch 51, the separate molding 84 of Figure 1a is saved. The second difference lies in the positioning of the front opening 27. This is offset to the left by about the width of the signal plate 50 compared to FIG. 1a, so that the signal plate 50 in the closed state of the bridge 8 under the Opening 27 lies. By pivoting the lever when opening the bridge 8 takes place, the plate 50 is therefore of a visible through the opening 27 in a position that cannot be seen, namely among those adjacent to the opening 27 Area of the end face 26 pivoted. The typical for the "ON" operating state Mark 54 must here on the signal plate 50, the one for the operating state "OFF" to be attached to the fixed plate 6.

Finally, FIG. 2D shows a third possibility of positioning the markings 53, 54 shown for the operating states "OFF" and "ON". The signal plate 50 is approximately here twice as wide as in Fig.1a and 2a and is both with one for the Operating state "ON" as well as with a typical for the operating state "OFF" Mark 53, 54 provided, which are formed as adjacent strips. At a pivoting of the lever 5 is therefore the "OFF" mark 53 of one that cannot be seen through the opening 27 into a viewable position and the "ON" mark 54 from one visible through the opening 27 into one not visible Position.

In addition to the optical, this embodiment of the invention has an electrical one Defect display on. Its most important component is one in the base of the lower part 22 pivotably mounted rocker 12, which extends through the base in the direction of the upper part 24, which actuated an auxiliary contact 40 when pivoting. With this auxiliary contact 40, the Supply circuit of an alarm device such as a signal lamp, siren or the like. Closed , which means that the person responsible for the maintenance of the system also without all Surge arrester to control individually can be informed of the defect.

The auxiliary contact 40 is, as is apparent from Fig.4b, c, not in the lower part 22 of the Surge arrester itself arranged, but is located in a separate, in the Switch box immediately next to the lower part 22 arranged switching device 41. Zur Transfer of the pivoting movement of the rocker 12 to this auxiliary contact 40 has the Rocker 12 has a recess 37 in the area of its pivot axis 31. The switching device 41 is equipped with a shaft 42 projecting from its housing, the end of which is in this Recess 37 engages and can thus be connected to the rocker 12 so that it cannot rotate. This In turn, shaft 42 is in mechanical connection with auxiliary contact 40 and closes this with appropriate pivoting.

5a, b show possible embodiments of such a switching device 41. In 5a, the auxiliary contact 40 is designed as an opener and comprises two leaf spring-like Contact carrier 43, which are fixed with their first ends in the housing and the second Wear the ends of contacts 44 and sliding pieces 45. On the with the rocker 12 in engagement standing shaft 42 is formed on a crank, which is designated 46 in the rest position. The contacts 44 abut each other in this rest position; the auxiliary contact is 40 closed.

When the rocker 12 is pivoted, the crank takes one of the positions denoted by 46 ' one, its tip deflects one of the contact carriers 43 via one of the sliders 45 and thus separates the contacts 44 from each other. How clear from the graphic representation emerges, the crank 46 can be pivoted both clockwise and counterclockwise to open the auxiliary contact 40.

According to the embodiment shown in FIG. 5b, the auxiliary contact 40 is an alternating contact educated. There are two fixed contacts 47, 48 and only one movable one Contact 44, which in turn is fixed to the free end of a leaf spring-like contact carrier 43 is. When pivoting the crank 46 counterclockwise, the Contact carrier 43 deflected so that the movable contact 44 from the first fixed Contact 47 separated and applied to the second fixed contact 48.

This embodiment is only when the rocker 12 is pivoted counterclockwise usable.

To pivot the rocker 12, the bridge 8 itself is used, for which the Bottom plate 29 of the upper part 24 has an opening 30 in the range of movement of the bridge 8 having. The rocker 12 engages in its rest position, in which it is in the drawings is shown, this opening 30 comes with the upper part 24 fully inserted thus to lie within the path of movement of the bridge 8. With their opening movement comes the web 83, or more precisely a protruding into the opening 30 on Web 83 molded nose 85 on the rocker 12 to the system and takes this - just like that Lever 5- with (see in particular Fig.3 and Fig.2c).

So that the rocker 12 remains in its rest position when the upper part 24 is intact, it is with a connected elastic component, which biases them in the direction of the rest position. Options for the specific configuration of this elastic component are shown in FIG. 4d shown.

With dashed lines is one with its first end in the lower part 22 and with its second end at a distance from the pivot axis 31 of the rocker 12 on this attached coil spring 32 shown. This arrangement requires that the bridge 8 only the one shown in Figure 3, but not an opposite to this direction of movement would have: With such an opposite direction of movement would namely at Opening of the bridge 9, a swiveling of the rocker 12 take place clockwise, which the (tension) spring 32 could no longer undo. To reset the Ensure rocker 12 can also be a second, in the event of clockwise gifts the other direction acting tension spring 33 are added.

However, preferably only a single component is used, which has the function of Preload of the rocker 12 met in both pivot directions provided. A such a component could, for example, be an elastic band 34, which with its first End in the lower part 22 and with its second end spaced from the pivot axis 31 is fixed to the rocker 12 and extends normal to the directions of pivoting.

One way of designing the elastic component is to make it around To form pivot axis 31 of the rocker 12 extending torsion spring 13. Also this must be fixed against rotation in one point in the lower part 22 and in at least one Point be connected to the rocker 12.

As shown in FIG. 4d, this torsion spring 13 could be designed as an elastic ring, which is cut open in the area of the rocker 12 and the two of which thereby arise Ends 35, 36 are bent radially outwards and are applied to the rocker 12. Im the two This ring is fixed in the lower part 22 at the ends 35, 36 opposite region.

According to a particularly preferred embodiment shown in FIG Torsion spring 13 formed by a coil spring. Their two ends 130, 131 run parallel to the pivot axis 31 thus extend out of the image plane of FIG go over the sections 132 extending radially with respect to the pivot axis 31, 133 in the helical, again running around the pivot axis 31 Spring body 134 over.

The ends 130, 131 are now on the two side surfaces 120, 121 of the rocker 12 and simultaneously on those side surfaces 120, 121 aligned on the lower part 22 molded stops 122, 123, which stops 122, 123 in the view according to Fig. 4e lie below the rocker 12 and are therefore shown in dashed lines.

When the rocker 12 is pivoted counterclockwise, the first spring end 130 taken away from the rocker side surface 120, the second spring end 131 remains fixed at stop 123. The coil spring 13 is therefore by the Twisted movement tensioned and exerts restoring forces acting towards their rest position the rocker 12 out.

The same effect occurs when the rocker 12 is pivoted clockwise: Here is the second spring end 131 entrained by the rocker side surface 121 and the first Spring end 130 pressed against the stop 120, which also causes restoring forces on the Rocker 12 can be exercised.

In addition to the electrical defect display, the rocker 12 is used in combination with the bridge 8 further used to ensure that only intact upper parts 24 in the lower part 22nd can be used. Due to the immediately adjacent arrangement of the bridge 8 to the base plate 29 or to their opening 30 in connection with their geometric Dimensions, namely, is achieved that the bridge 8, more precisely to the web 83rd molded nose 85, in the open state the opening 30 at least in the area of rocker 12 located in its rest position is covered. So when trying to get one insert defective upper part 24 into a lower part 22, the rocker 12 to rest against the nose 85, which prevents insertion of the contact pins 9 into the contact receptacles 23.

The lower shell 22 has the usual combination of lower shell 21 for switching devices and upper shell 20. In addition to the rocker 12, which has already been explained in detail, this has Lower part 22 still terminals for those to be monitored for overvoltages Lines on which are designed as lift terminals. They consist of the lower part 22 fixed frame 16 and in these slidably held boxes 17, which by means of Clamping screws 19 which pass through the frame 16 freely rotatably and in the thread of Boxes 17 engage, can be raised and lowered. With the specified framework 16 are preferably formed as copper rails leads 18 connected in the base of the Lower part 22 end and have the contacts 23 at these ends. This Contact 23 are formed as central cuts in the leads 18, wherein the resulting two end sections per supply line 18 each with a spring 14 are held together.

The bottom of the base is on a top-hat rail, as is usual for control box devices designed snap-on. For this purpose, the usual design, namely one undercut fixed on the underside and one movable in Form of a locking slide 15 fixed undercut in so far as two Locking slide 15 are provided. The lower part 22 is thereby with respect to its vertical axis fully symmetrical, consequently its upper and lower shells 20, 21 are completely identical, it therefore only one type of housing shell needs to be manufactured.

To ensure that the upper part 24 is only correctly aligned with the lower part 22 can be inserted, is a pin 38 on the outside of the bottom plate 29 of the upper part and a corresponding bore 39 is made in the base of the lower part 22.

Claims (16)

Pluggable surge arrester comprising a lower part (22) with contact receptacles (23) and an upper part (24) with contact pins (9) which can be inserted into the contact receptacles (23) and with a surge arrester element (1), preferably a varistor, arranged between these contact pins (9) At least one soldering point (25) is arranged in the supply line to the surge arrester element (1), at which one of the soldered supply line parts (11, 8) with a biasing this supply line part (8) in the direction away from the soldering point (25) Spring (2) is connected, characterized in that the spring-biased supply part (8) is formed by a bridge, the two ends (81, 82) of which are connected to the further supply parts (11) via solder joints (25). Pluggable surge arrester according to claim 1, characterized in that the bridge (8) is double L-shaped in cross section. Pluggable surge arrester according to Claim 1 or 2, characterized in that the bridge (8) has at one end (82) a web (83) which is preferably made in one piece with the bridge (8) and on which the spring (2) is fixed. Pluggable surge arrester according to Claim 1, 2 or 3, characterized in that the first end (81) of the bridge (8) is soldered to a contact pin (9). Pluggable surge arrester according to one of Claims 1 to 4, characterized in that the spring (2) is formed by a helical spring, preferably by a tension spring. Pluggable surge arrester according to one of the preceding claims, characterized in that the bridge (8) is arranged directly adjacent to the base plate (29) of the upper part (24), that the base plate (29) has an opening (30) in the range of movement of the bridge (8) and that in the base of the lower part (22) an auxiliary contact (40) actuating, pivotally mounted rocker (12) is provided, which in the idle state with the upper part (24) fully inserted penetrates the opening (30) and through the bridge (8 ) can be pivoted when they are opened. Pluggable surge arrester according to claim 6, characterized in that the bridge (8) covers the opening (30) in the open state at least in the area of the rocker (12) which is in the rest position. Pluggable surge arrester according to one of Claims 6 to 8, characterized in that the rocker (12) is connected to an elastic component which prestresses it in the direction of its rest position. Pluggable surge arrester according to Claim 8, characterized in that the elastic component prestresses the rocker (12) in both pivoting directions in the direction of the rest position. Pluggable surge arrester according to claim 9, characterized in that the elastic component is formed by a torsion spring (13) extending around the pivot axis (31) of the rocker (12). Pluggable surge arrester according to claim 10, characterized in that the torsion spring (13) is formed by a helical spring, the two ends (130, 131) of which run parallel to the pivot axis (31) and on the side surfaces (120, 121) of the rocker (12) and on to these side surfaces (120, 121) aligned stops (122, 123) formed on the lower part (22). Pluggable surge arrester according to one of Claims 1 to 11, characterized by an optical defect indicator comprising an opening (27) arranged in the end face (26) of the upper part (24) and a lever (5) which is movably mounted in the interior of the upper part (24) extends from the area of the opening (27) into the path of movement of the bridge (8) and whose first end located in the area of the opening (27) carries a signal plate (50), which signal plate (50) on its opening (27) facing surface is provided with a marking (53) typical of the operating state "OFF", which marking (53) can be moved from a position not visible through the opening (27) to a visible position by means of the lever movement caused by the bridge (8) during its opening movement is or which signal plate (50) on its surface facing the opening (27) with a type for the operating state "ON" Chen marking (54) is provided, which marking (54) by means of the bridge (8) during its opening movement lever movement from a view through the opening (27) can be brought into a position not visible. Pluggable surge arrester according to claim 12, characterized in that the lever (5) is pivotally mounted and that the marking (53) of the signal plate (50) typical of the operating state "OFF" in the closed state of the bridge (8) is below the opening (27) adjoining area of the end face (26) and can be pivoted under the opening (27) by means of lever pivoting caused by the bridge (8) during its opening movement or that the marking (54) of the signal plate (54) typical of the operating state "ON" 50) in the closed state of the bridge (8) lies under the opening (27) and can be pivoted by means of the lever pivoting caused by the bridge (8) during its opening movement under the region of the end face (26) adjacent to the opening (27). Pluggable surge arrester according to claim 13, characterized in that below the signal plate (50) fixed to the lever (5) there is a further plate (6) fixed immovably in the upper part (24). Pluggable surge arrester according to claim 13, characterized in that the signal plate (50) is provided with a marking which is typical for the operating state "ON" and with a marking which is typical for the operating state "OFF". Pluggable surge arrester according to Claim 13, 14 or 15, characterized in that the second end of the lever (5) which extends into the path of movement of the bridge (8) has a notch (52) into which the web (83) of the bridge ( 8) intervenes.

Images