EP1359597B1 - Circuit breaker - Google Patents

Description

TECHNICAL AREA

The invention is based on a circuit breaker according the preamble of claim 1.

STATE OF THE ART

From the published patent application DE 42 00 896 A1 is a Circuit breaker known, having a quenching chamber with two fixed, spaced apart Arcing. The quenching chamber is equipped with an insulating gas, preferably SF6 gas under pressure, filled. in the switched state of the quenching chamber are the two Burn-off contacts by means of a movable Bypass contact electrically conductive with each other connected. The bridging contact surrounds the cylindrical trained Abbrandkontakte concentric. Of the Bridging contact and the two Abbrandkontakte form a power circuit, which only when you turn off is energized. When an elimination slides the Bridging contact from a first of the burnup contacts down and pulls an arc, the first between the first burnup contact and its end facing the Bypass contact burns. As soon as this end the second Abbrandkontakt reached commutes the arc base from the end of the bridging contact to the second Arcing. The arc is burning between the two two burn-off contacts and will blow until the Arc extinguishes. The necessary for the blowing pressurized insulating gas is usually by means of one connected to the movable bridging contact Blaskolbens generated.

This circuit breaker also points parallel to the Leistungsstrombahn a nominal current path, the at switched on circuit breaker the operating current leads. The rated current is concentric around the power current path arranged. The bridging contact is here with a movable, arranged in the nominal current path Rated current contact mechanically rigidly connected. At the Turn off first the nominal current path is interrupted, the to be interrupted current then commuted to the Leistungsstrombahn, where then, as described above, a Arc is initiated and then deleted.

The bridging contact points, due to its Dimensions, a comparatively large mass to be moved to speed up the gear shifts and is to slow down. The drive of the circuit breaker must be the provide the necessary energy for this.

From the published patent application DE 31 27 962 A1 is another Circuit breaker known, having a quenching chamber with two fixed, spaced apart Arcing. The quenching chamber is equipped with an insulating gas, preferably SF6 gas under pressure, filled. in the switched state of the quenching chamber are the two Burn-off contacts by means of a movable Bypass contact electrically conductive with each other connected. The bridging contact surrounds the cylindrical trained Abbrandkontakte concentric. Of the Bridging contact is also here as a rated current contact educated. An elimination of this circuit breaker is similar to the previously described Circuit breaker.

This bridging contact also shows due to its dimensions, a comparatively large to be moved Ground up to speed up the gear shifts and is to slow down. The drive of the circuit breaker must be the provide the necessary energy for this.

From the patent CH 611 452 is a cylindrical built-in circuit breaker known to be a central having arranged bridging contact. in the switched-on state leads here but the Bridging contact also the rated current. Because of this Nennstromführungsvermögens has the bridging contact a comparatively large mass, when switching must be moved and slowed down. When switching off takes place the outflow of the hot gases laterally radially out of the Arc zone out.

PRESENTATION OF THE INVENTION

The invention as defined in the independent claims marked, solves the task, a To provide circuit breaker of the type mentioned, which is easier and less expensive to create and which has a higher creep resistance.

This circuit breaker is with at least one with a insulating medium filled, cylindrically shaped, along a central axis, one Provided power flow path having quenching chamber. He also has two fixed, on the central axis arranged, spaced from each other in the axial direction, arranged in the power flow path Abbrandkontaktanordnungen on and one the Abbrandkontaktanordnungen in the on state electrically conductively connecting, movable Bridging contact. Between the fixed Abbrandkontaktanordnungen is provided an arc zone and a parallel to the power flow path arranged with movable rated current contacts provided rated current path. The movable rated current contacts are over at least one Lever linkage connected to the bridging contact, wherein the lever linkage is designed so that the Rated current contacts always at a lower speed when the bridging contact is movable.

In this circuit breaker is therefore the movable Rated current contact moves much slower than that with him over a speed reducing, reasonably priced too creating lever linkage connected bridging contact. The fatigue life and thus the life of the Rated current contacts will, because of the smaller speed and the associated smaller mechanical Stress, advantageously increased, what the availability of the Circuit breaker significantly improved.

Because the bridging contact inside the Abbrandkontaktanordnungen, along the central axis extends, it can be advantageous with one small diameter and therefore with a particularly small Mass be executed. This circuit breaker can Therefore, with a comparatively large Off speed operated as this low-mass bypass contact with a comparatively small and advantageous cheap drive effectively accelerated and at the end of the switching movement again can be reliably braked.

The bridging contact is also easier here Shifter pin formed, the no resilient contact elements It is therefore comparatively simple and very inexpensive to produce.

The movable rated current contact is in the present Circuit breaker versions in a separate volume housed, which is from the area of Circuit breaker, in the hot gases generated by the arc and combustion particles occur completely separated. These hot gases and combustion particles can therefore the Do not negatively affect rated current contacts, whereby their Stability and thus their life advantageous is increased.

Another advantageous cheapening of inventive circuit breaker designs results in that the Abbrandkontaktanordnungen and partially also the housing parts of the same parts to mirror images a symmetry plane are constructed.

The further embodiments of the invention are objects the dependent claims.

The invention, its development and the achievable with it Advantages are given below with reference to the drawing which just one possible way of execution, closer explained.

BRIEF DESCRIPTION OF THE DRAWING

Fig.1 einen Schnitt durch die Kontaktzone einer ersten Ausführungsform eines erfindungsgemässen Leistungsschalters im eingeschalteten Zustand,

Fig.2 einen Schnitt durch die Kontaktzone einer ersten Ausführungsform eines erfindungsgemässen Leistungsschalters während des Ausschaltens,

Fig.3 einen Teilschnitt durch die Kontaktzone einer zweiten Ausführungsform eines erfindungsgemässen Leistungsschalters, und

Fig.4 einen stark vereinfachten Schnitt durch einen erfindungsgemässen Leistungsschalter, in der rechten Hälfte der Figur ist der Leistungsschalter im eingeschalteten Zustand dargestellt, in der linken Hälfte der Figur ist der Leistungsschalter im ausgeschalteten Zustand dargestellt.

Show it:

1 shows a section through the contact zone of a first embodiment of a circuit breaker according to the invention in the switched-on state,

2 shows a section through the contact zone of a first embodiment of a circuit breaker according to the invention during switching off,

3 shows a partial section through the contact zone of a second embodiment of a circuit breaker according to the invention, and

4 shows a greatly simplified section through an inventive circuit breaker, in the right half of the figure, the circuit breaker is shown in the on state, in the left half of the figure, the circuit breaker is shown in the off state.

In all figures the same elements are the same Provided with reference numerals. All for the immediate Understanding the invention are not required elements not shown.

WAYS FOR CARRYING OUT THE INVENTION

1 shows a section shown schematically through the contact zone 1 of the quenching chamber of a first Embodiment of a circuit breaker according to the invention when switched on. The extinguishing chamber is centric arranged symmetrically about a central axis 2. Along this central axis 2 extends a cylindrical trained, metallic switching pin 3, by means of a not shown drive along the central axis. 2 is mobile. The switching pin 3 has a dielectric favorably shaped tip 4 on, with a if necessary electrically conductive, burn-resistant material provided can be. When switched on the bridge Switching pin 3 electrically conductive a distance a between two consumable contact assemblies 5,6.

The burn-off contact arrangement 5 has a schematic shown contact cage 7, the electrically conductive with a paragraph of a plate-shaped carrier 8 Metal is connected. The contact cage 7 has contact fingers made of metal, which is springy on the surface of the Shift pin 3 rest. On the the Abbrandkontaktanordnung 6 facing side of the carrier 8, at the point of least distance between the two Abbrandkontaktanordnungen 5 and 6, is a Abbrandplatte. 9 with the aid of one of the known methods with this carrier 8 have been connected, in such a way that the ends 10 of the Contact fingers are protected against burnup. The Abbrandplatte 9 is preferably made of graphite, they However, it can also be made of other electrically conductive burn-resistant materials such as Consist tungsten copper compounds. The the carrier 8 remote surface of the Abbrandplatte 9 is by means of a ring-shaped cover 36 of a burn-resistant insulating material against Protected against arcing. In addition, by the Cover 36 prevents the arc root from becoming too migrates far into the storage volume 17 inside.

The Abbrandkontaktanordnung 6 corresponds in structure Abbrandkontaktanordnung 5, but it is arranged in mirror image to this. A dot-dash Line 11 indicates the plane of reflection, which differs from the central axis 2 is pierced vertically. The Abbrandkontaktanordnung 6 has a schematic shown contact cage 12, the electrically conductive with a shoulder of a plate-shaped carrier 13 made of metal. The contact cage 12 has Contact fingers made of metal, which spring on the Surface of the switch pin 3 rest. On the the Abbrandkontaktanordnung 5 facing side of the carrier 13, at the point of least distance between the two Abbrandkontaktanordnungen 5 and 6, is a Abbrandplatte 14th with the aid of one of the known methods with this carrier 13 been connected, in such a way that the ends 15 of the Contact fingers are protected against burnup. The Burn-off plate 14 is preferably made of graphite, they However, it can also be made of other electrically conductive burn-resistant materials such as Consist tungsten copper compounds. The the carrier 13th remote surface of the Abbrandplatte 14 is by means of a ring-shaped cover 41 of a burn-resistant insulating material against Protected against arcing. In addition, by the Cover 41 prevents the arc root from becoming too migrates far into the storage volume 17 inside.

Between the beams 8 and 13 is concentric with the central axis 2 arranged annular partition 16 from Clamped insulating material. The carrier 8 and 13 and the Partition 16 close an annular trained Storage volume 17, which is for storing the for provided the blowing of the arc pressurized insulating gas is designed. The carrier 8 represents an end face of a cylindrically shaped, completely enclosed by metallic walls Exhaust volume 18. The carrier 13 provides an end face a cylindrically shaped, completely of metallic walls enclosed exhaust volume 19. If a nominal current is provided, place the in this rated current path existing movable Rated current contacts in the switched-on state of Circuit breaker the electrically conductive connection between the metallic walls of the two exhaust volumes 18 and 19. The switch pin 3 becomes in this case only of comparatively small stray currents traversed.

The carrier 13 is provided with a bore 20 which with a check valve 21 shown schematically is closed. To the bore 20 is a line 22nd connected to the one of the switch pin 3 in Wirkverbindung standing piston-cylinder assembly at a Switching off compressed insulating gas to the storage volume 17 leads. An inflow of the pressurized Insulating gas in the storage volume 17 is only then possible if in the storage volume 17, a lower pressure prevails as in the line 22.

FIG. 2 shows a schematically represented section through the contact zone 1 of a first embodiment of Extinguishing chamber of a circuit breaker according to the invention while turning off. The switching pin 3 has in course his off movement in the direction of arrow 27 between the burn-off plates 9 and 14 pulled an arc 23. Of the Arc 23 acts on the surrounding insulating gas thermally and thereby briefly increases the pressure in this As arc zone 24 designated area of the quenching chamber. The pressurized insulating gas is in the storage volume 17th stored for a short time. Part of the pressurized However, insulating gas flows on the one hand through an opening 25th in the exhaust volume 18 and on the other hand through an opening 26 in the exhaust volume 19 from.

The switching pin 3 is with a piston-cylinder arrangement connected, in which at a switch-off insulating gas is compressed. This compressed insulating gas is how an arrow 28 indicates, through the line 22 in the Storage volume 17 initiated when in the storage volume 17th a lower pressure prevails than in line 22. This is for example the case when the arc 23 so low power is that he does not have the arc zone 24 can heat up intense enough. However, if a strong current Arc 23, the arc zone 24 heats up very much, so that a large pressure of the insulating gas in the storage volume 17 occurs, opens after exceeding a predetermined limit value, a pressure relief valve 29 and the Excess pressure is introduced into the exhaust volume 18 reduced. But it is also possible if the Circuit breaker, for example, only for comparatively Small breaking currents is designed on the Pressure relief valve to dispense.

If the arc 23 in rotation about the central axis. 2 offset, so it is known to heat the Arc zone 24 significantly enhanced. 3 shows a partial section through a with blasphemes 30 and 31st provided contact zone of an inventive Circuit breaker in off state. The magnetic field of the blowing coils 30 and 31 offset in known manner, the arc 23 when turned off in Rotation. The blowing coil 30 is in a recess of the Carrier 8 embedded, wherein the one coil end 32 a metallic bare contact surface, which means a screw 33 against the metallic bare surface of the Carrier 8 is pressed. The winding end 32 is with it electrically connected to the carrier 8. Between the remaining, the carrier 8 facing surface of the blow coil 30 and the carrier 8 is an electrical insulation 34th intended. This isolation 34 also dissociates the Turns of the blow coil 30 from each other. The other Winding end 35 of the blow coil 30 is electrically conductive with the Abbrandplatte 9 connected. The the carrier 8 facing away Surface of the blowing coil 30 and part of the surface of the Abbrandplatte 9 is by means of a cover 36 of a burn-resistant insulating material against Protected against arcing.

The bluff coil 31 is in a recess of the carrier 13th let in, wherein the one winding end 37 a metallic has bare contact surface, which by means of a screw 38 against the metallic bare surface of the carrier 13th is pressed. The coil end 37 is thus electrical conductively connected with the carrier 13. Between the remainder, the carrier 13 facing surface of the blow coil 31 and the carrier 13, an electrical insulation 39 is provided. This insulation 39 also dissociates the turns of the Blowing coil 31 from each other. The other winding end 40 of the Blass coil 31 is electrically conductive with the Abbrandplatte 14th connected. The carrier 13 facing away from the surface of the Blowing coil 31 and a part of the surface of the Abbrandplatte 14 is by means of a cover 41 of a burn-resistant insulating material against Protected against arcing.

The two puffing coils 30 and 31 are arranged so that the generated by these puffing 30 and 31 Amplify magnetic fields mutually. The two covers 36 and 41 form in this embodiment a annular nozzle channel whose throat the distance a has, and which widens in the radial direction until he goes into the storage volume 17.

4 shows a greatly simplified section through an inventive, shown schematically Circuit breaker, in the right half of the figure is the Circuit breaker shown in the on state, in the left half of the figure is the circuit breaker in turned off state shown. The circuit breaker is concentric around the central axis 2, its Power contacts are provided with blow coils 30,31. The filled with insulating gas under pressure, preferably SF6 gas Exhaust volume 18 is from the carrier 8, one with this connected, cylindrically shaped housing wall 42 and a the carrier 8 opposite, pressure-tight with the Housing wall 42 screwed cap 43 locked in. The closure lid 43 is in the center with a cylindrically shaped, in the direction of the opening 25th extended flow deflection 44 provided. The housing wall 42 and the closure lid 43 are, as well as the carrier 8, usually made of a highly electrically conductive metal produced.

The housing wall 42 is formed with a cylindrical Insulating tube 45 connected pressure-tight. On the housing wall 42 opposite side, the insulating tube 45 is pressure-tight with a further cylindrically shaped housing wall 46 connected. The housing wall 46 is formed exactly the same like the housing wall 42, but it is mirror-image too her arranged, wherein the dotted line 11 the Mirroring level indicates. The insulating tube 45 is arranged concentrically to the insulating partition 16. These Housing wall 46 is connected to the carrier 13. That with Insulating gas under pressure, preferably SF6 gas, filled Exhaust volume 19 is from the carrier 13, with this connected, housing wall 46 and a support 13th opposite, pressure-tight with the housing wall 46th bolted cover 47 included. The lid 47 is in Center provided with a cylinder 48. The housing wall 46 and the lid 47, as well as the carrier 13, in the Usually made of a good electrically conductive metal. Between the two housing walls 42 and 46 is a distance b provided. The housing wall 42 is outside with Mounting options for power connections 49 provided. The housing wall 46 is outside with mounting options for power connections 50 provided. The insulating tube 45 is in one formed by the two housing walls 42 and 46 Groove arranged, whereby by the pressure in the Exhaust volumes 18 and 19 caused tensile forces that the Insulate insulating tube 45 in the axial direction, minimized become. As a result of this recessed arrangement is the outer one Surface of the insulating tube 45 particularly good against Protected against transport damage.

In the cylinder 48 slides a compression piston 51, the is connected to the switching pin 3. The compression piston 51 compressed at the turn-off movement of the switching pin. 3 the insulating gas located in the cylinder 48. The compressed insulating gas flows through the schematic lines 22 and 22a shown in the storage volume 17th a, if the pressure conditions in this volume this allow. If in this cylinder 48 too high Compression pressure should occur, so this can by a not shown relief valve in the exhaust volume 19th be degraded into it.

The switching pin 3 is replaced by a not shown Drive moves. At the switching pin 3 is at least one Lever 52 hinged, the other end rotatable here and slidably mounted in the housing wall 46. With the Lever 52 is a rocker 53 rotatably connected, which the Force exerted by the lever 52 on a hinged rod 54th transfers. The rod 54 moves parallel to the direction the central axis 2, it is here in the housing wall 46th and guided in the carrier 13 with low friction. The other end of the Rod 54 is a schematic as a triangle shown fingerpad 55 connected. The finger-basket 55 serves as a holder for a variety of individually springy suspended contact fingers 56. To tilt avoid, are at least two such lever linkage for the operation of the finger basket 55 is provided as shown in FIG 4 is shown. The contact fingers 56 form in switched state the moving part of the Nominal current of the circuit breaker. In the right part of the 4 is the finger basket 55 in the on state of Circuit breaker shown, the contact fingers 56 In this position, bridge the distance b electrically conductive. The current through the circuit breaker then flows for example, from the power terminals 49 through the Housing wall 42, through the contact fingers 56 and the Housing wall 46 to the power terminals 50th

The room 57, in which this movable part of the nominal current path is accommodated by the insulating partition 16 and the beams 8 and 13 are very advantageously completely removed from the Arc zone 24 separated so that no in the Arc zone 24 generated burned particles in the area get the rated current contacts and this negative can influence. The lifetime of the rated current contacts is thereby increased very advantageous, which is an advantage increased availability of the circuit breaker result.

The lever linkage, each consisting of a lever 52, a Rocker 53 and a rod 54 consist are designed so that generated by the drive, not shown, comparatively high turn-off speed of the Switching pin 3, which in the range of 10 m / sec to 20 m / sec is, is converted into an approximately ten times smaller Turn-off speed of the finger basket 55 of about 1 m / sec up to 2 m / sec. As a result of this slower movement of the Fingerkorbs 55 is the mechanical stress of the same and also the contact fingers 56 are advantageously small, so that These components are comparatively light and low in mass can be performed, since they do not have a large mechanical Must withstand stresses. On the contact fingers 56 work because of the comparatively low speed, no large mechanical reaction forces, so that the Springs, which the contact fingers 56 against the on the Press housing walls 42 and 46 provided contact surfaces, can be interpreted comparatively weak. The Wear of the contact points of the contact fingers 56 and Contact surfaces on which the contact fingers 56 slide is, due to the relatively low spring forces, essential reduced.

The switching pin 3 is on the one hand with the help of in the Cylinder 48 sliding compression piston 51 out and on the other hand, in a guide part 58. The guide part 58 is by means of star-shaped ribs arranged with the carrier 13 connected.

In all three described embodiments of Power contacts of the circuit breaker are the Contact elements each formed as equal parts. The Use of equal parts cheapened advantageous the Production costs of the circuit breaker and simplified In addition, the warehousing for its spare parts.

To explain the operation, the figures are something closer look. When switching off, the switch pin 3 pulls in the course of its breaking motion between the Abbrandplatten 9 and 14 an arc 23. The switching pin 3 moves with a comparatively high level Turn-off speed, so that the arc 23 only briefly on the top 4 of the switch pin 3 burns and immediately commutated to the Abbrandplatte 14. The top 4 therefore has hardly any burn marks on. The burn-off plates 9 and 14 are made of particularly erosion-resistant material, they point Therefore, a comparatively long life. Of the Circuit breaker must therefore only comparatively rare be revised, making it a comparatively large Has availability.

The arc 23 is because of the very fast Switching off the shift pin 3 comparatively fast reach its full length, so shortly after the Contact separation the full arc energy available stands for the pressurization of the insulating gas in the Arc zone 24. The arc 23 acts on him surrounding insulating gas thermally and thereby increased briefly the pressure in the arc zone 24 of the quenching chamber. The pressurized insulating gas is in the storage volume 17th stored for a short time. Part of the pressurized However, insulating gas flows on the one hand through an opening 25th in the exhaust volume 18 and on the other hand through an opening 26 in the exhaust volume 19 from. The switching pin 3 is however usually connected to a piston-cylinder arrangement, in which compresses at a turn-off insulating gas becomes. This compressed insulating gas is in addition to the thermally generated pressurized insulating gas through the Line 22 introduced into the storage volume 17.

However, this inflow occurs only when in Storage volume 17, a lower pressure prevails than in the Line 22. This is for example before the contact separation the case or when the arc 23 so weak is that he the arc zone 24 is not intense enough can heat up. However, it heats a high-current arc 23 the arc zone 24 very strong, so a comparatively high pressure of the insulating gas in the Storage volume 17 occurs at this high pressure then takes place initially no inflow of the in the piston-cylinder assembly generated compressed gas. Will be in Storage volume 17 a predetermined limit of the stored pressure, so it opens after the Exceeding this predetermined limit Relief valve 29 and the excess pressure is in the Exhaust volume 18 degraded inside. This way is with great security prevents in this area a Inadmissible exceeding of the mechanical load capacity the components can occur.

As long as there is an overpressure in the arc zone 24, very hot ionized gas also flows through the openings 25 and 26 off in the exhaust volumes 18 and 19. In the constructive design of these two flow areas Care was taken to make them geometrically similar were designed to equal outflow conditions in to achieve both exhaust volumes 18 and 19. The top 4 of the shift pin 3 is in the center of the exhaust volume 19th arranged opposite the opening 26 and influenced together with the ribs of the guide member 57, the gas flow in this area. The flow deflection 44 is in Exhaust volume 18 at the point 4 corresponding point arranged opposite the opening 25 and influenced there the Gas flow in a similar manner. The two gas flows form because of the very similar design Flow areas similar, so that in the Arc zone 24 built-up pressure about evenly and controlled flows on both sides, making the im Storage volume 17 for the extinction of the arc 23rd existing insulating gas stored under pressure for so long can be done until a blowing of the arc 23 can.

The inventive circuit breaker is for Switchgears in the medium voltage range are particularly good suitable. The compact cylindrical design of the Circuit breaker is particularly suitable for installation in Metal-enclosed systems, in particular also for installation in metal-enclosed generator leads. In addition, the Circuit breaker very well suited for the replacement of obsolete circuit breakers, since he, with the same or better breaking capacity, a much smaller Space requirements than these are usually at one Such conversion no complicated structural changes necessary. If the circuit breaker for operating voltages above about 24 kV to 30 kV, so the distances a and b must be increased and the required Voltage must be adjusted, if necessary also the Turn-off speed of the switching pin 3 accordingly adapted, i. increase.

The switch-on speed of the switching pin 3 is at this circuit breaker in the range 5 m / sec to 10 m / sec, while the contact fingers 56 of the rated current contact with a corresponding turn-on speed in the range of 0.5 m / sec to 1 m / sec drive in their closed position.

NAME LIST

1

contact zone

2

central axis

3

switch Probe

4

top

5.6

consumable contact

7

Contact basket

8th

carrier

9

Abbrandplatte

10

end up

11

dash-dotted line

12

Contact basket

13

carrier

14

Abbrandplatte

15

end up

16

partition wall

17

storage volume

18.19

exhaust volume

20

drilling

21

check valve

22,22a

management

23

Electric arc

24

Arc zone

25.26

opening

27.28

arrow

29

Pressure relief valve

30.31

blowout coil

32

winding end

33

screw

34

isolation

35

winding end

36

cover

37

winding end

38

screw

39

isolation

40

winding end

41

cover

42

housing wall

43

cap

44

flow diversion

45

insulating

46

housing wall

47

cover

48

cylinder

49,50

power connectors

51

compression piston

52

lever

53

wing

54

pole

55

finger cage

56

contact fingers

57

room

58

guide part

from

distance

Claims (12)

1. Circuit breaker having at least one quenching chamber, which is filled with an insulating medium, is of cylindrical design, extends along a central axis (2) and has a power current path, having two stationary annular consumable contact arrangements (5, 6) which are arranged on the central axis (2), are at a distance from one another in the axial direction and are arranged in the power current path, having a moving bridging contact, which electrically conductively connects the consumable contact arrangements (5, 6) in the connected state, having an arc zone (24) which is provided between the stationary consumable contact arrangements (5, 6), and having a rated current path which is arranged in parallel with the power current path and is provided with moving rated current contacts,

   characterized in that the moving rated current contacts (56) are connected via at least one lever linkage to the bridging contact (3), and

   in that the lever linkage is designed such that the rated current contacts (56) always move at a lower speed than the bridging contact (3).
2. Circuit breaker according to Claim 1,

   characterized in that the moving rated current contacts of the rated current path are arranged in a space (57) which is completely separated from the arc zone.
3. Circuit breaker according to Claim 1 or 2,

   characterized in that the bridging contact is arranged in the interior of the annular consumable contact arrangements (5, 6), extending along the central axis (2).
4. Circuit breaker according to one of Claims 1 to 3,

   characterized in that the bridging contact is designed as a contact pin (3).
5. Circuit breaker according to Claim 4,

   characterized in that the contact pin (3) is driven at a disconnection speed in the range from 10 m/s to 20 m/s.
6. Circuit breaker according to one of Claims 1 to 5,

   characterized in that a nozzle zone is arranged between the stationary consumable contact arrangements (5, 6), is designed in an annular shape and opens into a storage volume (17) which is designed in an annular shape and is bounded by an insulating separating wall (16).
7. Circuit breaker according to one of Claims 1 to 6,

   characterized in that the consumable contact arrangements (5, 6) each have openings (25, 26) on the side facing away from the arc zone (24), for ionized gases to flow out of the arc zone (24) in a controlled manner into respectively adjacent evacuation volumes (18, 19).
8. Circuit breaker according to one of Claims 6 or 7,

   characterized in that the storage volume (17) is operatively connected to a piston-cylinder arrangement which additionally applies pressure to the insulating medium and is operated by the contact pin (3).
9. Circuit breaker according to one of Claims 1 to 8,

   characterized in that the components of the consumable contact arrangements (5, 6) are designed as identical parts which are arranged in mirror-image symmetry with respect to a plane of symmetry which is arranged at right angles to the central axis (2).
10. Circuit breaker according to Claim 7,

    characterized in that the evacuation volumes (18, 19) are each bounded by walls, the first evacuation volume (18) being enclosed by a first housing wall (42), a first carrier (8), which is connected to this first housing wall (42), and a closure cover (43), and the second evacuation volume (19) being enclosed by a second housing wall (46), a carrier (13), which is connected to this housing wall (46), and a cover (47), and

    in that the first housing wall (42) is connected to the second housing wall (46) by means of at least one insulating tube (45), an electrically insulating distance (b) remaining between the two housing walls (42, 46).
11. Circuit breaker according to Claim 10,

    characterized in that the first housing wall (42) together with the second housing wall (46) and contact fingers (56), which electrically conductively bridge the electrically insulating separation (b) between the first housing wall (42) and the second housing wall (46), form the rated current path of the circuit breaker, and

    in that the first housing wall (42) and the second housing wall (46) are designed as identical parts which are arranged in mirror-image symmetry with respect to a plane of symmetry which is arranged at right angles to the central axis (2).
12. Circuit breaker according to one of Claims 1 to 11,

    characterized in that the consumable contact arrangements (5, 6) are provided with at least one blowout coil (30, 31).

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