Switching device

Abstract

The invention relates to a switching device, in particular a medium-voltage switching device, comprising a first terminal, a main current path (6) and a secondary current path (7) electrically connected to the first terminal, wherein the main current path (6) has a main contact (3) and the secondary current path (7) has a secondary contact (4), a second terminal with at least one contact (5), a movable switching blade (2), wherein the switching blade (2) is arranged and configured to connect the contact (5) of the second terminal to the main contact (3) and / or the secondary contact (4) during a switching-on operation or to disconnect them during a switching-off operation, wherein the switching blade (2) can contact the main contact (3) and the secondary contact (4) simultaneously, so that the current can commutate from the main current path (6) to the secondary current path (7) during a switching-off operation, a circuit breaker,which is electrically arranged in the bypass path (7) between the bypass contact (4) and the first terminal and has a moving contact (12), and a lever with which the moving contact (12) of the circuit breaker can be actuated to open the circuit breaker. Such a switching device with improved functionality is characterized by a control cam (26) formed on the lever, a contact element formed on the switching blade (2), wherein the switching device is designed such that the control cam (26) of the lever and the contact element of the switching blade (2) interact during at least part of a switching operation to control the position of the lever depending on the position of the switching blade (2), and a locking device with which the movement of the lever in a position in which the circuit breaker is open is locked during a switching operation.

Description

[0001] The present invention relates to a switching device, in particular a medium-voltage switching device, comprising a first terminal, a main current path and a secondary current path electrically connected to the first terminal, wherein the main current path has a main contact and the secondary current path has a secondary contact, a second terminal with at least one contact, a movable switching blade, wherein the switching blade is arranged and configured to connect the contact of the second terminal to the main contact and / or the secondary contact during a switching-on operation or to disconnect them during a switching-off operation, wherein the switching blade can contact the main contact and the secondary contact together so that the current can commutate from the main current path to the secondary current path during a switching-off operation, a circuit breaker,which is electrically arranged in the bypass path between the secondary contact and the first terminal piece and has a moving contact, and a lever with which the moving contact of the circuit breaker can be actuated in order to open the circuit breaker.

[0002] Such a switching device is known from WO 2013 / 110511 A1. The switching device has a rotary switch that can be rotated through 360°, whereby the rotary switch is turned in only one direction to turn the switching device on and off, and the switching device can be moved from an on position to an off position and back to an on position with each 180° rotation of the switching blade. The switching device has a main current path and a secondary current path. A vacuum circuit breaker is provided in the secondary current path, the moving contact of which can be actuated by a lever.The lever is actuated by a control cam on the rotary switch such that the vacuum circuit breaker is switched on when the switching device is in the on position, where current flows exclusively through the main current path. During a switching operation, it remains switched on until the rotary switch interrupts the current in the main current path, at which point the current flows entirely through the secondary current path and is then interrupted by switching off the vacuum circuit breaker. Once the vacuum circuit breaker is off, the rotary switch is turned further to an off position, in which the vacuum circuit breaker is switched on again due to the control cam on the rotary switch. With a further turn of the rotary switch, it reaches an on position again, in which the switching blade closes the main current path.Since the rotary switch is designed to rotate 360°, all contacts of the rotary switch in the switching device are designed as sliding contacts.

[0003] In contrast, one object of the subject matter of the invention is to provide a switching device that is improved in its functionality compared to the previously known switching device.

[0004] This problem is solved in a switching device of the type mentioned above with the features of claim 1.

[0005] The switching device according to the invention, unlike that of WO 2013 / 1120511 A1, does not have a rotary switch whose control cam must move in conjunction with the switching blade. Instead, the control cam is formed on the lever by which the circuit breaker is actuated to extinguish a switching arc. The control cam of the lever interacts with a contact element formed on the switching blade, the switching device being designed such that the control cam of the lever and the contact element interact during part of the switching process to control the position of the lever depending on the position of the switching blade. To prevent the lever from interfering with the movement of the switching blade during a switching process, a locking device is provided which locks the movement of the lever in a position where the circuit breaker is open during a switching process.

[0006] Given the need for extremely fast switching to minimize the duration of arcs generated during switching, a significant advantage of the switching device according to the invention is that the control cam is not located on the switching blade, but rather on a separate lever that is not constantly moved by it. This significantly reduces the mass that needs to be accelerated and decelerated when switching the device on and off. The switching blade only needs to interact with the lever during the switching-off phase, and the duration of this interaction can be precisely limited to the time required to move the circuit breaker from an on to an off position during the switching-off phase. This is achieved by a locking mechanism that prevents the lever from being driven or decelerated during the remaining switching phases.This allows for the complete elimination of masses requiring deceleration. As a result, compared to other switching devices with similar functionality, either faster switching is possible due to smaller masses to be moved or decelerated, or the design can be simplified due to lower forces occurring during switching, for example, by using a less powerful drive for the shaft that drives the switching blade.

[0007] It is common and therefore preferred for the switching blade to be rotatable about a central axis and for its opposite ends to contact the contact on the second terminal as well as the main contact and / or the auxiliary contact, i.e., for the switching blade to be two-armed. Alternatively, it is conceivable that the switching blade is rotatable about an axis at one of its ends, the contact of the second terminal extends as a sliding contact in an arc with a first radius around the axis, and the main and auxiliary contacts are arranged on an arc with a second and / or third radius around the axis, wherein the second and / or third radius is different from the first radius and preferably larger. In another alternative, the axis is not arranged centrally between the ends of the switching blade, but off-center, in which case the contacts of the switching device must be arranged accordingly.In another alternative, the switching blade is not rotatable, but arranged to be movable in one direction, and the contacts of the switching device must in turn be arranged accordingly.

[0008] The main contact of the switching device according to the invention is preferably designed as a snap-action contact. This ensures, firstly, that the switching blade has a very precisely defined position in an ON switching position, and secondly, that the switching blade is decelerated by the snap-action contact when the ON switching position is reached.

[0009] In contrast, the contact at the second connector is preferred because it is structurally simple and designed as a sliding contact.

[0010] In a preferred embodiment, the lever of the switching device according to the invention is designed with two sides and a pivot point arranged between two lever arms, wherein one lever arm, preferably at its end, is connected to the moving contact of the circuit breaker and the control cam is arranged on the other lever arm. A two-sided lever allows for a more compact design compared to a single-sided lever.

[0011] In a structurally simple and therefore preferred embodiment of the switching device according to the invention, the locking device is formed by a stop formed on the lever and a spring-loaded locking slide that interacts with it but is not mounted on the lever. The locking slide is preferably arranged such that during a switching operation, it is pushed by the switching blade into a position in which the lever is unlocked, thus switching on the circuit breaker.

[0012] Furthermore, it is preferred if a spring acting on the moving contact is provided on the circuit breaker, which acts in the opposite direction to the switching-on direction of the moving contact. This facilitates rapid disconnection of the circuit breaker when the switching device is switched off.

[0013] A vacuum circuit breaker is preferably used as the circuit breaker. Vacuum circuit breakers have the particular advantage that, when they are switched off during the switching of the switching device to disconnect the bypass path, this occurs without the formation of an arc.

[0014] Preferably, at least the switching device, the main current path, and the secondary current path, including the circuit breaker, are arranged in an encapsulated, insulating gas-filled housing. If an insulating gas is used in the housing, the distances between the individual current-carrying parts can be smaller in the OFF switching position without the risk of arcing.

[0015] A stop for the switching knife is particularly preferred in a position of the switching device, i.e. the OFF position, on a wall of the housing.

[0016] In a further preferred embodiment, the switching blade is designed with two spaced-apart contact plates that are essentially parallel. This allows the contact element of the switching blade to be mounted between the contact plates on both sides.

[0017] The switching device according to the invention can preferably be used as a two-position switch, in particular as a load break switch. It is intended, among other things, for use in medium-voltage switchgear with nominal voltages from 1 to 52 kV.

[0018] The invention will now be explained in more detail with reference to figures illustrating an embodiment of the invention in various switching positions. These figures show... Fig. 1 a partial view of the embodiment in the OFF switch position; Fig. 1a an upper section of the partial view of the Fig. 1 ; Fig. 2 a partial view of the embodiment in a first switching position during switch-on; Fig. 2a an upper section of the partial view of the Figure 2 ; Fig. 3 a partial view of the embodiment in a second switching position during switch-on; Fig. 3a an upper section of the partial view of the Figure 3; Fig. 4 a partial view of the embodiment in a third switching position during switch-on; Fig. 4a an upper section of the partial view of the Figure 4 ; Fig. 5 a partial view of the embodiment in the ON switch position; Fig. 5a an upper section of the partial view of the Fig. 5 ; Fig. 6 a partial view of the embodiment in a first switching position during switching off; Fig. 6a an upper section of the partial view of the Figure 6 ; Fig. 7 a partial view of the embodiment in a second switching position during switching off; Fig. 7a an upper section of the partial view of the Figure 7 ; Fig. 8 a partial view of the embodiment in a third switching position during switching off; Fig. 8a an upper section of the partial view of the Figure 8 ; Fig. 9 a partial view of the embodiment in a fourth switching position during switching off; Fig. 9a an upper section of the partial view of the Figure 9; Fig. 10 a partial view of the embodiment in a fifth switching position during switching off; Fig. 10a an upper section of the partial view of the Figure 10 .

[0019] The Figures 1 and 1a The figures show the essential elements of a switching device according to the invention. The switching device shown is a load break switch, but the invention can also be used for other types of switches.

[0020] The switching device has a central switching blade 2 rotatably mounted on a shaft 1. It is designed with two parallel, rod-shaped plates, the outer ends of which are approximately equidistant from the axis of rotation of the shaft 1. A main contact 3, a secondary contact 4, and a contact 5 are arranged approximately on a circular path around the axis of rotation of the shaft 1, spaced apart such that they can make contact with one of the ends of the switching blade 2.

[0021] The main contact 3 is electrically connected via a main current path 6 to a first terminal (not shown), while the secondary contact 4 is connected to the first terminal via a secondary current path 7. The contact 5 is electrically connected to a second terminal (not shown). The first and second terminals can, for example, be configured to be electrically connected to a busbar of a switchgear assembly or to a cable exit of a switchgear assembly.

[0022] In order for contact 5 to establish an electrical connection with the main contact 3 and / or the secondary contact 4, contact 5 is designed as a sliding contact via a circular segment that corresponds 180° to a circular segment in which the main contact 3 and the secondary contact 4 are located. The secondary contact 4 is also designed as a sliding contact, and the main contact 3 as a contact point.

[0023] The main contact 3 and the auxiliary contact 4 are arranged at a distance from each other. To enable the switching blade 2 to contact the main contact 3 and the auxiliary contact 4 simultaneously, so that the current can commutate from the main current path 6 to the auxiliary current path 7 during a switching operation, the corresponding end of the switching blade 2 is provided with a contact plate 8 extending transversely to a longitudinal axis of the switching blade 2, which is suitable for bridging the gap between the main contact 3 and the auxiliary contact 4. The switching blade 2 can, for example, be designed with one contact plate or, as in this exemplary embodiment, with two contact plates 8 arranged parallel to each other.

[0024] In the bypass path, an interrupter, here a vacuum circuit breaker 9, is provided, which is suitable for interrupting a current in the bypass path 7. The circuit breaker 9 has a fixed contact 11 and a moving contact 12, which can be electrically connected to and disconnected from each other in a switching chamber 13. The moving contact 12 has an end 14 outside the switching chamber, by means of which it can be actuated. In the exemplary embodiment, the circuit breaker is a vacuum circuit breaker. Due to the pressure difference between the vacuum inside the switching chamber 13 and the pressure outside the switching chamber 13, the moving contact 12 is automatically pressed towards the closed position of the vacuum circuit breaker 9. A spring 15 acting on the end 14 of the moving contact 12 is provided, which assists in opening the circuit breaker 9, but is not strong enough on its own to open the vacuum circuit breaker 9.

[0025] To control the movement of the moving contact 12, a double-sided lever 16 with a short side 17 and a long side 18 is provided, which are rotatable about a pivot point 19. The end of the short side 17 of the lever 16 is connected to the end 14 of the moving contact 12 via an elongated hole 21. The double-sided lever is designed with two parallel lever plates 16a, 16b, of which the lever plate 16a, shown at the front in the illustrated view, is exclusively in Figure 1The lever plate 16b is shown in Figure 1b and hidden in all other figures for clarity, so that only the rearmost of the two lever plates 16b is visible. The lever plates 16a and 16b are identical on their facing sides. The long side 18 of the double-sided lever 16 interacts with a roller 22 as a contact element, which is arranged on the part of the switching knife 2 facing the main contact 3 and secondary contact 4, and with a locking slide 23, which is pressed towards a locking position by a spring 24. The locking slide 23 and the spring 24 are shown only in Figure 1b. Fig. 1For clarity, they are hidden. A stop 25 is formed on the long side 18 of the double-sided lever 16, so that the double-sided lever 16 is held in a position where the two contacts 11, 12 of the circuit breaker 9 are separated from each other when the locking slide 23 is in the locked position. Furthermore, a control cam 26 is formed on the long side 18 such that, due to the pressure acting on the moving contact 12 towards the shaft 1, it can be pressed against the roller 22 of the switching knife 2 when the double-sided lever 16 is not in a locked position. The movement of the double-sided lever 16 can then be determined by the position of the switching knife 2. The control cam 26 is designed such that the double-sided lever 16 is deflected by the switching knife 2 to separate the moving contact 12 from the fixed contact 11 of the vacuum circuit breaker 9.

[0026] The components of the described embodiment are located in a housing, one side of which 27 is inserted into the Figures 1, 1aThe switching blade 2 is shown in the housing side in a recess 28, in which it can move freely within an angular range of 90° from an OFF position of the switching device to an ON position of the switching device and back to an OFF position. In the figures, the switching blade 2 moves clockwise when the switching device is switched on and counterclockwise when it is switched off. At the end of a switching-on process, the movement of the switching blade 2 is limited by the main contact 3, which, as already mentioned, is designed as a snap-action contact. At the end of a switching-off process, the movement of the switching blade 2 is limited by two walls 29, 31 of the housing side 27, which serve as stops for the front edges (in the direction of rotation counterclockwise) of the part of the switching blade 2 facing the main contact 3 and secondary contact 4, and of the part of the switching blade 2 facing contact 5.

[0027] Based on the Figure 1 , 1a to 5 ,5a The switching-on process of the exemplary embodiment will be explained in more detail below.

[0028] In the Figures 1, 1a The embodiment is shown in its OFF switching position. In this switching position, the switching blade 2 rests against the walls 29, 31 of the housing, and the ends of the switching blade 2 are at the greatest possible distance from the contacts within the housing. In this position, the vacuum circuit breaker 9 is switched off, and the fixed contact 11 and the moving contact 12 are separated from each other. No current flows. The double-sided lever 16 rests with a main edge 25a of its stop 25 against the locking slide 23, which is in its locked position. The double-sided lever 16 is pressed against the locking slide 23 due to the pressure difference between the vacuum inside the switching chamber 13 and the surrounding environment.

[0029] In the Figures 2, 2aThe switching point 2 is shown in a first position during its clockwise rotation when the switching device is switched on. In this position, the switching point 2 is electrically connected on one side to the auxiliary contact 4 and on the other side to contact 5. The vacuum circuit breaker 9 remains open, and the double-sided lever 16 is locked by the locking slide 23. No current flows.

[0030] In the Figures 3, 3a The switching indicator 2 is shown in a second position during clockwise rotation when the switching device is switched on, in relation to the position in the Figures 2, 2aThe switching blade 2 has been rotated slightly further clockwise. In this position, the switching blade 2 is electrically connected on one side to both the main contact 3 and, via the contact plate 8, to the secondary contact 4, and on the other side to contact 5. Current flows through the main current path. Furthermore, the vacuum circuit breaker 9 is open and the double-sided lever 16 is locked by the locking slide 23.

[0031] In the Figures 4, 4a The switching indicator 2 is shown in another position during clockwise rotation when the switching device is switched on, in relation to the position in the Figures 3, 3ahas rotated further clockwise. In this position, the switching blade 2 is electrically connected on one side to both the main contact 3 and, just barely, via the contact plate 8 to the secondary contact 4, and on the other side to contact 5. Furthermore, the vacuum circuit breaker 9 is open and the double-sided lever 16 is locked by the locking slide 23. Current flows through the main current path. The end of the switching blade 2 facing the main contact 3 and the secondary contact 4 has almost reached the locking slide 23.

[0032] In the Figures 5, 5aThe switching blade 2 has reached its end position in its clockwise rotation and is in the ON position; current flows through the main current path. In this position, the switching blade 2 is electrically connected on one side to the main contact 3 and on the other side to contact 5. The switching blade 2 has pushed the locking slide 23 to the side against the force of its spring 24, thus releasing the double-sided lever 16. This has automatically closed the vacuum circuit breaker 9. Simultaneously, the double-sided lever 16 has pivoted slightly counterclockwise around the pivot point 19, following the movement of the end 14 of the moving contact 12. The stop 25 has a secondary edge 25b, which is angled relative to the primary edge 25a and serves to prevent the spring-loaded locking slide 23 from being moved back into its locked position.

[0033] Based on the Figures 6, 6a, to 10 , 10aThe switching-off process of the exemplary embodiment is explained in more detail below. Starting from the ON position, the switching blade 2 rotates counterclockwise. This movement occurs automatically due to the pressure difference between the vacuum inside the switching chamber 13 and its surroundings, and is made possible by the fact that the locking slide 23 no longer blocks the movement of the double-sided lever 16.

[0034] In the Figures 6, 6aThe switching blade 2 is shown in a first position during its counterclockwise rotation when the switching device is switched off. In this position, the switching blade 2 is electrically connected on one side to both the main contact 3 and, just barely, via the contact plate 8 to the secondary contact 4, and on the other side to contact 5, so that current flows through both the main current path 6 and the secondary current path 7. The vacuum circuit breaker 9 is closed. The locking slide 23 remains blocked by the secondary edge 25b of the stop 25, the position of the double-sided lever 16 is unchanged compared to that in the ON position, and the vacuum circuit breaker 9 remains switched on.

[0035] In the Figures 7, 7a The shift indicator 2 is shown in a second position during the counterclockwise rotation, opposite the position in the Figures 6, 6ahas rotated slightly further. In this position, the switching knife 2 is only electrically connected to the secondary contact 4 on one side and to the contact 5 on the other side; the current flows exclusively via the secondary current path 7. The locking slide 23 remains blocked by the secondary edge 25b of the stop 25, the position of the double-sided lever 16 is unchanged compared to the ON switching position, and the vacuum circuit breaker 9 remains switched on.

[0036] In the Figures 8, 8a The switching indicator 2 is shown in a third position during the counterclockwise rotation when switching off the switching device, in relation to the position in the Figures 7, 7ahas rotated slightly further, but remains electrically connected to the auxiliary contact 4 and contact 5, and current flows via the auxiliary current path. The locking slide 23 remains blocked by the secondary edge 25b of the stop 25, the position of the double-sided lever 16 remains unchanged compared to the ON position, and the vacuum circuit breaker 9 remains switched on. However, the switching knife 2 has rotated so far that the roller 22 of the switching knife 2 is in contact with the control cam 26. To show this, in Figure 8a Both switching knife plates, which are essentially arranged parallel to each other, and other parts of the switching knife 2, as well as the main contact 3, are hidden.

[0037] In the Figures 9, 9a The switching indicator 2 is shown in another position during the counterclockwise rotation when switching off the switching device, in which it is located opposite the position in the Figures 8, 8ahas rotated a little further, but remains electrically connected to the auxiliary contact 4 and the contact 5. In doing so, the roller 22 has pivoted the double-sided lever 16 clockwise via the control cam 26 to such an extent that the vacuum switch 9 is switched off. To demonstrate this, the following are also shown in Figure 9a Both switching knife plates and other parts of the switching knife 2, as well as the main contact, are hidden. By pivoting the double-sided lever 16, the locking slide 23 is no longer blocked in its movement and, due to spring force, returns to its position locking the double-sided lever 16. In this position of the switching knife 2, the current flow is completely interrupted.

[0038] In the Figures 10, 10a The switching indicator 2 is shown in yet another position during the counterclockwise rotation when switching off the switching device, in which it is located opposite the position in the Figures 9, 9aIt has rotated further and is no longer electrically connected to secondary contact 4 and contact 5. No current flows.

[0039] In the present embodiment, a vacuum circuit breaker 9 and a spring 15 are used. The pressure acting on the moving contact 12 inside the switching device housing causes the vacuum circuit breaker 9 to close automatically, even against the force of the spring 15. To open the vacuum circuit breaker 9, the roller 22 of the switching blade 2, via the control cam 26 on the long side 18 of the double-sided lever 16, counteracts the pressure acting on the moving contact 12 inside the housing. This operating principle can easily be reversed. For example, a circuit breaker can be used that opens automatically due to a pressure within its switching chamber that is higher than the pressure inside the switching device housing, or due to a spring acting on the moving contact.In this case, the contact edge of the control cam could be designed such that the double-sided lever is forcibly moved into a position where the circuit breaker is closed by a movement of the switching blade. This can be achieved, for example, with a suitable control cam shape, if the roller engages the control cam on its side facing shaft 1. This variant has the advantage over the variant shown in the figures, for example, that a locking slide and a corresponding stop on the double-sided lever can be dispensed with, since in this variant the circuit breaker opens automatically and remains in the open position without further ado. The figures in the...

[0040] The embodiment shown in the figures is nevertheless preferred insofar as the switching knife requires less force when switching off the switching device, i.e., a lower torque has to be transmitted through shaft 1. Reference symbol list

[0041] 1 Shaft 2 Switching point 3 Main contact 4 Secondary contact 5 Contact 6 Main current path 7 Secondary current path 8 Contact plate 9 Vacuum circuit breaker 11 Fixed contact 12 Moving contact 13 Switching chamber 14 End of moving contact 15 Spring 16 Double-sided lever 16a Lever plate 16b Lever plate 17 Short side of lever 18 Long side of lever 19 Pivot point 21 Slotted hole 22 Roller 23 Locking slide 24 Spring 25 Stop 25a Main edge of stop 25b Secondary edge of stop 26 Control cam 27 Housing side 28 Recess in housing 29 Wall of housing side 31 Wall of housing side

Claims

1. Switching device, in particular medium-voltage switching device, comprising: - a first terminal, - a main current path (6) and a secondary current path (7) electrically connected to the first terminal, the main current path having a main contact (3) and the secondary current path having a secondary contact (4), - a second terminal with at least one contact (5), - a movable switching blade (2), - the switching blade (2) being arranged and configured to connect the contact of the second terminal to the main contact (3) and / or the secondary contact (4) during a switching-on operation or to disconnect them during a switching-off operation, the switching blade (2) being able to contact the main contact (3) and the secondary contact (4) simultaneously, so that the current can commutate from the main current path (6) to the secondary current path (7) during a switching-off operation, - a circuit breaker,which is electrically arranged in the bypass path between the secondary contact (5) and the first terminal and has at least one moving contact (12), and - a lever with which the moving contact (12) of the circuit breaker can be actuated in order to open the circuit breaker, characterized by - a control cam 26 formed on the lever), - a contact element formed on the switching knife (2), wherein the switching device is designed such that the control cam (26) of the lever and the contact element of the switching knife (2) interact during at least part of a switching-off operation to control the position of the lever depending on the position of the switching knife (2), and - a locking device with which the movement of the lever in a position in which the circuit breaker is open is locked during a switching-on operation.

2. Switching device according to claim 1, characterized by the fact thatthe switching knife (2) is rotatable about a central axis and can contact the contact (5) on the second connector as well as the main contact (3) and / or the secondary contact (4) with its opposite ends.

3. Switching device according to claim 1 or 2, characterized by the fact that the main contact (3) is designed as an impact contact.

4. Switching device according to one of the preceding claims, characterized by the fact that The contact (5) on the second connector is a sliding contact.

5. Switching device according to one of the preceding claims, characterized by the fact that the lever (16) is designed on two sides with a pivot point (19) arranged between two lever arms, wherein one lever arm, preferably at its end, is connected to the moving contact (12) of the circuit breaker and the control cam (26) is arranged on the other lever arm.

6. Switching device according to one of the preceding claims, characterized by the fact thatthe locking device is formed by a stop (25) formed on the lever and a spring-loaded locking slide (23) that interacts with it and is not mounted on the lever.

7. Switching device according to claim 6, characterized by the fact that the locking slide (23) is arranged such that during a switching operation it is pushed by the switching knife (2) into a position in which the lever is unlocked, so that the circuit breaker is switched on.

8. Switching device according to one of the preceding claims, characterized by a spring (15) acting on the moving contact (12) on the power switch, which acts against a switching direction of the moving contact (12).

9. Switching device according to one of the preceding claims, characterized by the fact that the circuit breaker is a vacuum circuit breaker (9).

10. Switching device according to one of the preceding claims, wherein at least the switching device (2), the main current path (6) and the secondary current path (7) including the circuit breaker are arranged in an encapsulated, insulating gas-filled housing.

11. Switching device according to claim 10, characterized by a stop on a housing side (27) for the switching knife (2) in an exhibition of the switching device.

12. Switching device according to one of the preceding claims, characterized by the fact that the switching knife (2) is designed with two spaced-apart contact plates (8) that are essentially parallel.

13. Switching device according to one of the preceding claims, characterized by the fact that It is a two-position switch, in particular a load break switch.

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