Contactor for safe pressure reduction in the event of overload

Abstract

The present invention relates to a contactor comprising a contact point having a fixed contact and a movable contact, wherein the movable contact is movable in a closing direction between an open position, in which the fixed contact and the movable contact are spatially separated, and a closed position, in which the fixed contact and the movable contact touch, wherein the contactor comprises a housing that has a first chamber (13), a second chamber (14) and a third chamber (19), wherein the first chamber is formed around the contact point in such a way that an arc that can arise between the fixed contact and the movable contact, if the movable contact leaves the closed position, does not leave the first chamber, wherein the second chamber forms a continuous cavity with the first chamber, which cavity is sealed with respect to the surroundings during normal operation, and the second chamber has a pressure reduction region as part of a first wall (17), wherein the third chamber divides the first wall with the second chamber, is not connected to the continuous cavity during normal operation and is open to the surroundings, wherein the pressure reduction region is designed in such a way that an overpressure in the continuous cavity is reduced via the pressure reduction region and the third chamber.

Description

[0001] Contactor for safe pressure relief in case of overload

[0002] The present invention relates to a contactor.

[0003] A generic contactor has a contact point with a fixed contact and a movable contact, wherein the movable contact is movable in a closing direction between an open position in which the fixed contact and the movable contact are spatially separated, and a closed position in which the fixed contact and the movable contact touch, and a housing which forms a continuous cavity around the contact point which is sealed from the environment.

[0004] The seal prevents the formation of an arc within the contact point and improves the extinguishing of the arc if one occurs.

[0005] Such known contactors often have the problem that either the housing has to be significantly oversized in terms of its stability and dimensions in relation to a current applied to the contact point during normal operation, or there is a risk that the housing will burst in the event of a short-circuit current and soot and plasma will escape from the housing into the environment, which represents a safety risk.

[0006] It is therefore an object of the present invention to provide an improved contactor of the generic type which enables a more compact contactor with a lower safety risk in the event of short-circuit currents.

[0007] The problem is solved by the features of independent claim 1. Accordingly, in a contactor according to the preamble of independent claim 1, the problem is solved according to the invention if the contactor comprises a contact point with a fixed contact and a movable contact, wherein the movable contact is movable in a closing direction between an open position in which the fixed contact and the movable contact are spatially separated, and a closed position in which the fixed contact and the movable contact touch each other, wherein the contactor comprises a housing having a first chamber, a second chamber and a third chamber, wherein the first chamber is formed around the contact point in such a way that an arc that can arise between the fixed contact and the movable contact when the movable contact leaves the closed position does not leave the first chamber,wherein the second chamber forms a continuous cavity with the first chamber, which is sealed from the environment during normal operation, and the second chamber has a pressure relief region as part of a first wall, wherein the third chamber shares the first wall with the second chamber, is not connected to the continuous cavity during normal operation, and is open to the environment, wherein the pressure relief region is designed such that an excess pressure in the continuous cavity is reduced via the pressure relief region and the third chamber.

[0008] The solution according to the invention offers the advantage that during normal operation there is a sealed, continuous cavity which has the above-mentioned advantages with regard to arc generation and extinguishing, and at the same time there is no need to over-dimension the housing, since in the event of overpressure in an overload situation, for example an arc generated by a short-circuit current, the pressure reduction takes place in a controlled manner via the pressure reduction area and an adjoining third chamber to the environment and an explosion escaping to the outside can be prevented with significantly more compact contactors.Since the contactor and the first chamber are designed in such a way that the arc necessarily remains in the first chamber, and thus plasma and soot would have to escape from the first chamber, via the second chamber and the pressure relief area and then via the third chamber into the environment, the escape of such materials can be effectively counteracted.

[0009] For the purposes of the invention, normal operation represents switching of the contact point without pressure reduction across the pressure reduction region, so that the continuous cavity is sealed during switching and the subsequent extinguishing of an arc. The sealing of the continuous cavity is such that the leakage rate from the continuous cavity during normal operation is so low that the pressure in the continuous cavity increases after switching and the pressure in the continuous cavity at the time of the subsequent extinguishing of the arc is a maximum of 5%, preferably a maximum of 3%, particularly preferably a maximum of 1%, lower than a maximum pressure in the continuous cavity in the period between switching and extinguishing the arc.The leakage rate exists in particular because an actuator via a carrier which extends into the continuous cavity and is connected to the movable contact causes the movement of the movable contact in the closing direction and a certain leakage exists between the carrier and the corresponding opening in the continuous cavity.

[0010] An overpressure, as defined by the invention, represents a pressure in the continuous cavity that arises due to an arc between the fixed contact and the moving contact that is sufficiently long and at correspondingly high temperatures. It is so high that the pressure relief area opens, thereby dissipating the pressure from the continuous cavity to the environment via the third chamber. Such pressure can arise from very high currents in the event of an overload, for example, in the event of a short circuit, via the contact point in the contactor, and without controlled relief, it would endanger the integrity of the housing.

[0011] The pressure relief area can be designed, for example, as a mechanical pressure relief valve in the first wall, as a bursting object inserted into the first wall, or as a bursting area as an integral component of the first wall. Accordingly, the pressure relief area can be dimensioned such that it opens at a predetermined pressure, the overpressure, which is selected such that the integrity of the remaining housing can withstand this pressure. Accordingly, the maximum pressure in the connected cavity is limited. This enables compact and precise dimensioning of the housing and thus of the contactor.

[0012] Advantageous embodiments of the present invention are the subject of the subclaims.

[0013] In a particularly preferred embodiment of the present invention, it is provided that the contactor has two contact points, wherein the movable contacts of the two contact points are arranged on a contact bridge and are spaced from one another in a transverse direction along the contact bridge such that the closing directions for the movable contacts are the same and are substantially perpendicular to the transverse direction, wherein the housing has two first chambers, in each of which one of the two contact points is arranged and the housing has a fourth chamber which, together with the first chambers and the second chamber, forms part of the connected cavity and which is arranged between the two first chambers such that the contact bridge traverses the fourth chamber in the transverse direction.Such contactors with two contact points, whose movable contacts are arranged on a common contact bridge, are used in a variety of technical applications. Preferably, the drive carrier is arranged in the fourth chamber, and the opening in the housing through which the carrier extends into the continuous cavity is formed in a wall of the fourth chamber, behind which the drive of the carrier is arranged.

[0014] Further preferably, the second chamber has an opening to the fourth chamber and is connected to the first chambers via the fourth chamber, wherein the opening runs substantially parallel to a plane spanned by the closing direction and the transverse direction, wherein the pressure reduction region is preferably arranged opposite the opening to the fourth chamber. This spatially separates the first chambers from the second chamber and soot and plasma experience a change of direction when they flow from the first chambers via the fourth chamber into the second chamber with a corresponding opening. This can reduce the proportion of soot, metal and plastic particles and plasma that pass from the first chambers into the second chamber. This is advantageous because these should not escape into the environment.

[0015] According to a further preferred embodiment, the fixed contacts are accessible from the outside and extend into the first chambers. The fixed contacts are overmolded at an entry point into the respective first chamber such that a hermetic seal exists between the entry point and the fixed contact, and no pressure can escape from the connected cavity through the entry point. This allows for improved sealing of the connected cavity during normal operation.

[0016] According to a further preferred embodiment, the housing has two second chambers and two third chambers, wherein the two second chambers are arranged on opposite sides of the fourth chamber, and the third chambers are each arranged downstream of the second chambers, starting from the fourth chamber. This results in redundancy and thus improved safety with regard to the opening of one of the pressure relief areas in one of the second chambers, since the opening of one of these areas is sufficient for pressure relief.

[0017] In a particularly preferred embodiment of the present invention, the pressure relief area is designed as a bursting area, which is an integral part of the first wall and bursts toward the third chamber in the event of excess pressure. This eliminates the need for an additional component for the housing, simplifying the housing design.

[0018] Preferably, the third chamber is open to the environment, and an area of ​​the bursting zone is designed such that the pressure within the continuous cavity is reduced to ambient pressure within a maximum of 0.01 seconds, preferably within a maximum of 0.005 seconds, particularly preferably within a maximum of 0.001 seconds. This ensures that the stress on the housing and other components of the contactor caused by the excess pressure can be reduced quickly.

[0019] In a preferred embodiment, a wall thickness in the bursting area is at least partially reduced compared to an average wall thickness of the first wall, wherein the at least partially reduced wall thickness in the bursting area preferably amounts to a maximum of 70%, preferably a maximum of 40%, particularly preferably a maximum of 12.5%, of the average wall thickness of the first wall. The reduction in wall thickness results in predetermined breaking points. The reduction in wall thickness can occur only along one edge of the bursting area or across the entire bursting area. By selecting the reduced wall thickness and the areas in which this reduced wall thickness is present, it is possible to adjust the pressure at which the bursting area opens and the size of such an opening.

[0020] The tool-technical design of the bursting area creates a weld line, which is formed by the meeting of the flow fronts when the plastic is sprayed, and thus involves an additional weakening of the bursting area.

[0021] In a preferred embodiment of the present invention, the bursting region is convexly curved relative to an interior of the second chamber, and regions of the first wall surrounding the bursting region are concavely curved or uncurved relative to the interior of the second chamber. As a result, the stability of the regions of the first wall surrounding the bursting region is increased relative to the stability of the bursting region, even independent of any reduction in wall thickness in the bursting region, and the bursting behavior of the bursting region can be adjusted more precisely. The curved walls increase the surface area and thus increase the force acting on the bursting region.

[0022] According to a preferred embodiment, the third chamber has a gas outlet wall which closes off the third chamber from the environment, with at least one, preferably at least two, outlet openings, wherein the third chamber is designed such that the gas outlet wall has at least a 90° angle with the first wall, so that a gas which flows through the pressure reduction region after an overpressure in the connected cavity has to carry out at least a 90° change of direction in order to leave the third chamber through the at least one, preferably at least two, outlet openings towards the environment, wherein preferably the at least one, preferably at least two, outlet openings function as the only openings of the third chamber to the environment.As a result, soot, metal and plastic particles, and plasma that enter the third chamber through the pressure relief zone would have to change direction by at least 90° to leave the third chamber towards the environment. Furthermore, if the pressure relief zone is designed as a bursting zone, an element breaking out of the bursting zone will strike a wall of the third chamber without an opening, preventing or impeding the element from flying out of the third chamber. The gas outlet wall is preferably aligned perpendicular to a plane spanned by the closing direction and the transverse direction and further preferably forms the ceiling of the third chamber. This allows gravity to be used to prevent soot, metal and plastic particles, and plasma from escaping.

[0023] Preferably, the at least one, preferably at least two, outlet openings are designed as slots, and / or an area of ​​the at least one, preferably at least two, outlet openings corresponds to a maximum of 40%, preferably a maximum of 20%, of the area of ​​the bursting area. This further prevents an element breaking out of the bursting area from flying out of the third chamber.

[0024] In a particularly preferred embodiment of the present invention, the housing has an inner housing which forms at least the chambers of the connected cavity, and an outer housing, wherein the third chamber is formed in regions by the inner housing and the outer housing. This simplifies the construction of the contactor since only the inner housing has to create a sealed cavity, and this is not the case for the outer housing. Preferably, the inner housing consists of a base plate which forms a floor for the first chambers, the second chamber(s) and the fourth chamber, and a counterpart which forms the remaining walls of the first chambers, the second chamber(s) and the fourth chamber and preferably all walls of the third chamber(s) except for the gas outlet wall.

[0025] In a further preferred embodiment of the present invention, it is provided that the outer housing forms the gas outlet wall of the third chamber, wherein preferably the inner housing forms all other walls of the third chamber including the first wall and a wall opposite the first wall, and the other walls have no openings to the environment.

[0026] In a preferred embodiment of the present invention, the outer housing completely encloses the inner housing perpendicular to the closing direction, with the outer housing preferably being fixed and held to the inner housing by means of locking hooks. Thus, the outer housing forms an additional enclosure in this direction. Furthermore, no additional components are required, resulting in an advantageous, compact design.

[0027] According to a further preferred embodiment of the present invention, the contactor has at least one arc-blowing device with at least one blowout magnet, which generates an arc-blowing field in one of the first chambers and is arranged around the respective first chamber. The contactor can additionally have a second arc-blowing device with at least one blowout magnet, which generates an arc-blowing field in the other of the first chambers and is arranged around the respective first chamber, or the arc-blowing device generates an arc-blowing field in both first chambers and is also arranged around both first chambers. The arc-blowing device(s) additionally lengthen the arc and press it against a wall of the first chambers, thereby extinguishing the arc.

[0028] Preferably, the arc blowing device(s) is / are arranged between the inner housing and the outer housing. This protects the arc blowing device from the influence of the arcs.

[0029] According to a further preferred embodiment of the present invention, the housing is made of glass fiber filled polyamide.

[0030] An embodiment of the present invention is explained in more detail below with reference to drawings.

[0031] They show:

[0032] Figure 1 oblique view of an embodiment of a contactor according to the invention with the xyz coordinate system drawn in,

[0033] Figure 2a, b sections through the embodiment in an xz-plane in an oblique view (Fig. 2a) and with a view in the y-direction (Fig. 2b),

[0034] Figure 3a, b sections through the embodiment in an xy-plane with a view opposite to the z-direction (Fig. 3a) and an oblique view (Fig. 2b),

[0035] Figure 4a, b sections through the embodiment in two yz-planes with view against the x-direction,

[0036] Figure 5a Section through the inner housing of the embodiment in an xy plane with oblique view,

[0037] Figure 5b shows a section through the inner housing and the fixed contacts of the exemplary embodiment in an xz-plane with an oblique view, Figures 6a, b, c, d show views of the counterpart of the inner housing of the exemplary embodiment, wherein Fig. 6a and 6b show oblique views, Fig. 6c shows a view opposite to the z-direction and Fig. 6d shows a view in the z-direction,

[0038] Figures 7a, b, c, d show views of the base plate of the inner housing of the embodiment, wherein Fig. 7a and 7b are oblique views, Fig. 7c shows a view opposite to the z-direction and Fig. 7d shows a view in the z-direction,

[0039] Figures 8a, b, c, d show views of the first part of the outer housing of the embodiment, wherein Fig. 8a and 8b are oblique views, Fig. 8c shows a view opposite to the z-direction and Fig. 8d shows a view in the z-direction, and

[0040] Figures 9a, b, c, d show views of the second part of the outer housing of the embodiment, wherein Fig. 9a and 9b show oblique views, Fig. 9c shows a view opposite to the z-direction and Fig. 9d shows a view in the z-direction.

[0041] In the following explanations, identical parts are designated by identical reference numerals. Where a figure contains reference numerals that are not further explained in the corresponding figure description, reference is made to preceding or subsequent figure descriptions.

[0042] The figures show an embodiment of a contactor 1 according to the invention or components thereof.

[0043] The contactor 1 has a housing consisting of an inner housing and an outer housing. The inner housing consists of a base plate 2 of the inner housing and a counterpart 3 of the inner housing, which are sealed from each other by means of a sealing ring 23. The outer housing consists of a first part 4 of the outer housing and a second part 5 of the outer housing.

[0044] In addition, the contactor 1 has a first contact point with a first fixed contact 6 and a first movable contact 7, and a second contact point with a second fixed contact 8 and a second movable contact 9, wherein the first movable contact 7 and the second movable contact 9 are arranged on a common contact bridge 10 and are spaced from one another in a transverse direction that runs parallel to the x-direction. A drive 11, which in the exemplary embodiment is designed as an electromagnetic drive, can move the first movable contact 7 and second movable contact 9 in a closing direction that runs parallel to the z-direction from an open position to a closed position and back again via a carrier 12 that is connected to the contact bridge 10 via contact pressure springs.In the open position, the first fixed contact 6 and the first movable contact 7, as well as the second fixed contact 8 and the second movable contact 9, do not touch each other. The contact bridge 10 is shown in this open position in the figures. In the closed position, the first fixed contact 6 and the first movable contact 7, as well as the second fixed contact 8 and the second movable contact 9, do touch each other. When the contact points open, arcs can occur between the fixed contacts and movable contacts, which must be extinguished. For this purpose, the contactor has an arc-blowing device comprising two permanent magnets 21 and two pole plates 22 that surround the contact points perpendicular to the closing direction.

[0045] The arc blowing device is formed around the inner housing, in which the contact points are arranged in a connected cavity formed from two first chambers 13, two second chambers 14, and a fourth chamber 15. One of the contact points is arranged within each first chamber 13, with the first fixed contact 6 and the second fixed contact 8 being accessible from the outside and extending through a cover of the counterpart 3 of the inner housing into the respective first chamber 13. The first fixed contact 6 and the second fixed contact 8 are overmolded in such a way that the entry of the respective fixed contact into the respective first chamber 13 is hermetically sealed.The arrangement of the contact points, the first chambers 13, and the arc blowing device are designed such that an arc forming between the respective fixed contact 6, 8 and movable contact 7, 9 is elongated within the respective first chamber 13 and pressed against a wall of the first chamber 13 without being able to leave the first chamber 13. This is achieved by the orientation of the magnetic field generated by the arc blowing device and the design of the first chambers 13.

[0046] The fourth chamber 15 lies transversely between the two first chambers 13, through which the contact bridge 10 extends from one of the first chambers 13 into the other first chamber 13. The support 12 of the drive 11 extends through an opening in the base plate 2 of the inner housing into the fourth chamber 15. The second chambers 14 each have an opening 16 to the fourth chamber 15, which runs essentially parallel to a plane spanned by the closing direction and transverse direction - the ZX plane. The second chambers 14 are thus connected to the first chambers 13 via the openings 16 and the fourth chamber 15, with the second chambers 14 being arranged on opposite sides of the fourth chamber 15.

[0047] A pressure relief region in the form of a bursting region 18 is arranged on the first walls 17 of the second chambers 14, opposite the openings 16. The wall thickness in the bursting region 18 is reduced compared to the remaining wall thickness of the first wall 17 by groove-shaped recesses, so that the bursting region forms a predetermined breaking point of the first wall 17. This is additionally achieved by the bursting region 18 being concave relative to an interior of the second chamber 14 and the regions of the first wall 17 adjacent to the bursting region 18 being convex relative to the interior of the second chamber 14.

[0048] Behind the respective first wall 17 of the second chamber 14, the housing forms a third chamber 19, which, during normal operation, described below, is separated from the contiguous cavity and connected to the environment. The counterpart 3 of the inner housing forms all walls of the third chamber 19 except for a gas outlet wall, which is formed by the first part 4 of the outer housing and closes off the third chamber 19 in the z-direction. The gas outlet wall is the only wall of the third chamber 19 that has openings in the form of four slots 20 that connect the third chamber 19 to the environment.

[0049] The continuous cavity is sealed. In the context of the invention, this means that the cavity is sealed in such a way that the leakage rate from the continuous cavity, which occurs, for example, due to the carrier 12 entering the continuous cavity, is so low that when the contact points open and an arc is formed between the respective fixed contacts 6, 8 and movable contacts 7, 9, the pressure buildup initially generated by the arcs exceeds the leakage rate. This increases the pressure in the continuous cavity, which has a positive effect on the extinguishing of the arcs. During normal operation, however, the resulting pressure is so low that the bursting areas 18 can withstand it and the arcs are quickly extinguished.The leakage rate during normal operation is so low that the pressure in the connected cavity at the time of the subsequent extinguishing of the arcs is a maximum of 5%, preferably a maximum of 3%, particularly preferably a maximum of 1%, lower than a maximum pressure in the connected cavity in the time period between the switching and the extinguishing of the arcs.

[0050] In exceptional cases, for example a short-circuit current, the current to be switched can be so high that the arcs cannot be extinguished during normal operation. This means that the pressure caused by the long-lasting and hot arcs in the connected cavity increases to such an extent that an overpressure is created which bursts one of the bursting areas 18 in one of the two second chambers 14. This causes the pressure to decrease to the environment via one of the third chambers 19. By opening the bursting area 18 at a defined overpressure and the resulting pressure reduction in the connected cavity, several positive effects can be achieved. The bursting areas 18 can be designed so that the overpressure which opens them can be precisely defined. The housing can be dimensioned accordingly with regard to this pressure, since it will not experience any higher pressure, and can be designed accordingly compactly.Furthermore, the pressure reduction takes place in a safe manner that does not endanger the environment.

[0051] The slots 20 are designed so narrow that an element breaking out of the bursting area 18 cannot pass through them. Furthermore, if a bursting area 18 were to open, plasma, metal and plastic particles, and soot formed by the arcs in the first chambers 13 would first have to change direction to reach the corresponding second chamber 14, and then change direction again to reach the slots 20 through the opening in the bursting area 18. This ultimately effectively prevents the escape of plasma, metal and plastic particles, and soot.

[0052] List of reference symbols

[0053] 1 contactor

[0054] 2 base plate

[0055] 3 Counterpart

[0056] 4 first part

[0057] 5 second part

[0058] 6 first fixed contact

[0059] 7 first moving contact

[0060] 8 second fixed contact

[0061] 9 second movable contact

[0062] 10 Contact bridge

[0063] 11 Drive

[0064] 12 carriers

[0065] 13 First Chamber

[0066] 14 second chamber

[0067] 15 fourth chamber

[0068] 16 Opening to the fourth chamber

[0069] 17 first wall

[0070] 18 Burst area

[0071] 19 Third Chamber

[0072] 20 slots

[0073] 21 Permanent magnet

[0074] 22 Pole plate

[0075] 23 Sealing ring

Claims

Claims 1. A contactor comprising a contact point with a fixed contact and a movable contact, wherein the movable contact is movable in a closing direction between an open position in which the fixed contact and the movable contact are spatially separated, and a closed position in which the fixed contact and the movable contact touch each other, wherein the contactor comprises a housing having a first chamber, a second chamber, and a third chamber, wherein the first chamber is formed around the contact point such that an arc that may arise between the fixed contact and the movable contact when the movable contact leaves the closed position does not leave the first chamber, wherein the second chamber forms a continuous cavity with the first chamber, which is sealed from the environment during normal operation, and the second chamber has a pressure relief area as part of a first wall,wherein the third chamber shares the first wall with the second chamber, is not connected to the continuous cavity during normal operation and is open to the environment, wherein the pressure reduction region is designed such that an excess pressure in the continuous cavity is reduced via the pressure reduction region and the third chamber.

2. Contactor according to claim 1, characterized in that the contactor has two contact points, the movable contacts of the two contact points being arranged on a contact bridge and being spaced from one another in a transverse direction along the contact bridge such that the closing directions for the movable contacts are the same and are substantially perpendicular to the transverse direction, the housing having two first chambers, in each of which one of the two contact points is arranged and the housing having a fourth chamber which, together with the first chambers and the second chamber, forms part of the continuous cavity and which is arranged between the two first chambers such that the contact bridge traverses the fourth chamber in the transverse direction.

3. Contactor according to claim 2, characterized in that the second chamber has an opening to the fourth chamber and is connected to the first chambers via the fourth chamber, wherein the opening runs substantially parallel to a plane spanned by the closing direction and the transverse direction, wherein the pressure reduction region is preferably arranged opposite the opening to the fourth chamber.

4. Contactor according to claim 3, characterized in that the housing has two second chambers and two third chambers, the two second chambers being arranged on opposite sides of the fourth chamber and the third chambers each being arranged downstream of the second chambers starting from the fourth chamber.

5. Contactor according to one of claims 1 to 4, characterized in that the pressure reduction region is designed as a bursting region which is an integral part of the first wall and bursts in the direction of the third chamber in the event of excess pressure.

6. Contactor according to claim 5, characterized in that the third chamber is open to the environment and a surface of the bursting area is designed such that the pressure within the continuous cavity is reduced to ambient pressure within a maximum of 0.01 seconds, preferably within a maximum of 0.005 seconds, particularly preferably within a maximum of 0.001 seconds.

7. Contactor according to claim 5 or 6, characterized in that a wall thickness in the bursting region is at least partially reduced compared to an average wall thickness of the first wall, wherein the at least partially reduced wall thickness in the bursting region preferably amounts to a maximum of 70%, preferably a maximum of 40%, particularly preferably a maximum of 12.5%, of the average wall thickness of the first wall.

8. Contactor according to one of claims 5 to 7, characterized in that the bursting area is convexly curved relative to an interior of the second chamber and that regions of the first wall surrounding the bursting area are concavely curved or uncurved relative to the interior of the second chamber.

9. Contactor according to one of claims 1 to 8, characterized in that the third chamber has a gas outlet wall, which closes off the third chamber from the environment, with at least one, preferably at least two, outlet openings, wherein the third chamber is designed such that the gas outlet wall has at least a 90° angle with respect to the first wall, so that a gas which flows through the pressure reduction area after an overpressure in the connected cavity has to carry out at least a 90° change of direction in order to reach the third chamber through the at least one, preferably at least two, outlet openings in To exit towards the environment, wherein preferably the at least one, preferably at least two, outlet openings function as the only openings of the third chamber to the environment.

10. Contactor according to claim 9, characterized in that the at least one, preferably at least two, outlet openings are designed as slots and / or an area of one of the at least one, preferably at least two, outlet openings corresponds to a maximum of 40%, preferably a maximum of 20%, of an area of the bursting area.

11. Contactor according to one of claims 1 to 10, characterized in that the housing has an inner housing which forms at least the chambers of the continuous cavity, and an outer housing, the third chamber being formed in regions by the inner housing and the outer housing.

12. Contactor according to claim 9 and 11, characterized in that the outer housing forms the gas outlet wall of the third chamber, wherein preferably the inner housing forms all other walls of the third chamber including the first wall and a wall opposite the first wall and the other walls have no openings to the environment.

13. Contactor according to claim 11 or 12, characterized in that the outer housing completely encloses the inner housing perpendicular to the closing direction.

14. Contactor according to one of claims 2 to 13, characterized in that the contactor has at least one arc blowing device with at least one blowing magnet, which generates an arc blowing field in one of the first chambers and is arranged around the respective first chamber.

15. Contactor according to claim 11 and 14, characterized in that the arc blowing device is arranged between the inner housing and the outer housing.

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