DC voltage switching device with integrated interruption mechanism

Abstract

The invention relates to a DC voltage switching device (100) for coupling a DC voltage load (200) to a DC voltage source (4) via a positive conductor (8) and a negative conductor (10), the DC voltage switching device having a housing or being at least partially surrounded by a housing. At least one first switching element (101), in particular a semiconductor-based, electronically controllable switching element, is contained inside the housing and is integrated in the positive conductor (8) and / or in the negative conductor (10) for coupling and decoupling of the DC voltage load (200). The DC voltage device is characterised in that the housing has at least two housing parts (100-1, 100-2) which are mechanically coupled to one another and can be moved relative to one another, the housing being closed in a first position of these two housing parts which can be moved relative to one another and the housing being open in a second position of the housing parts which can be moved relative to one another, and at least one of the positive and negative conductors (8, 10) being interrupted as a result of the second position.

Description

[0001] DC switching device with integrated interruption mechanism

[0002] Description

[0003] The invention relates to a DC switching device for coupling a DC load to a DC voltage source via a positive conductor and / or negative conductor.

[0004] To couple a DC load, i.e. in particular to electrically couple or connect a DC load to a DC voltage source, but also to electrically decouple the DC load, a DC switching device is usually used. In this case, both a positive conductor and / or a negative conductor, via which the DC load is coupled to the DC voltage source, can be led through the DC switching device. Within the scope of the invention, the DC load does not have to be a single load, but can also be composed of a group of DC loads or be designed as a DC network with a large number of DC loads operated via it. In practical implementation, the positive conductor and the negative conductor therefore expediently run between an input terminal of the DC switching device and an output terminal of the DC switching device.The two conductors are therefore first electrically connected, in particular via the two input terminals of the DC switching device, to a DC voltage source, e.g. a DC voltage bus, for applying an external DC voltage, and are then electrically connected, in particular via the two output terminals of the DC switching device, to the DC load to be connected to the DC voltage. For electrically switching the DC load on and off, i.e. for coupling and decoupling it, the DC switching device comprises at least one first switching element. A controllable semiconductor switching element is often used for this purpose, which is located between the DC voltage source and the DC load (orIn an expedient embodiment, the positive conductor running between the respective input terminal and output terminal of the DC switching device for the positive conductor is integrated and / or in the negative conductor running equally between the DC voltage source and the DC voltage load (or in an expedient embodiment, the negative conductor running between the respective input terminal and output terminal of the DC switching device for the negative conductor). Furthermore, in a supplementary, expedient embodiment, at least one further switching element, in particular an electromechanical switching element, can be provided in the positive conductor and / or in the negative conductor. If the semiconductor switching element is switched on and each of the possiblyIf at least one additional switching element provided in the positive conductor and / or in the negative conductor is in a closed state, a current flows between the DC voltage source and the DC voltage load. This current flow can be prevented or interrupted, in particular, by switching off or opening the first switching element, i.e., in particular, the semiconductor switching element.

[0005] In practical implementation, such a generic DC switching device typically comprises a housing in which its electronic and / or electrical components, i.e., at least the first switching element, are at least partially housed. Such a housing is known to provide protection against external influences, i.e., in particular, mechanical and other environmental influences, but also to protect the environment, including persons, from potential interference and damage caused by these components. For example, the housing must, in particular, protect persons from accidental contact with the enclosed device.

[0006] In particular, if the housing is to be designed to be easy to maintain, for example to replace individual components, these are often subject to strict safety requirements with regard to the protection of the environment, including people.

[0007] The object of the invention is therefore to provide a generic DC switching device which, in particular with a housing accessible for maintenance and in particular in a simple and cost-effective manner, offers further improved, highly effective protection for the environment, including persons. This object is achieved according to the invention by a DC switching device having the features of claim 1. Expedient embodiments and further developments are the subject of the claims dependent on claim 1.

[0008] Accordingly, in a DC switching device which is designed to couple a DC load via a positive conductor and / or negative conductor to a DC voltage source, and which has a housing or is at least partially surrounded by a housing, within which at least one first switching element, in particular a semiconductor-based, electronically controllable switching element, is integrated into the positive conductor and / or the negative conductor for coupling and uncoupling the DC load, it is proposed according to the invention that the housing has at least two housing parts which are mechanically coupled to one another and movable relative to one another,wherein in a first position of these two housing parts movable relative to one another, the housing is closed and in a second position of the housing parts movable relative to one another, the housing is opened and at least one of the positive and negative conductors is interrupted due to the second position.

[0009] The DC switching device is consequently designed with an integrated interruption mechanism which is functionally arranged, by means of or due to the relative positions of two movable housing parts, either to effect a closed housing or to interrupt at least one of the positive and negative conductors in an open housing.

[0010] In other words, the integrated interruption mechanism is configured in such a way that the possibility of electrically connecting, i.e., coupling the DC load, even by the at least first switching element, is no longer possible or effectively prevented when the housing is open. Rather, when the housing is open, the DC load is always in an electrically disconnected, i.e., uncoupled, state. The invention is described in more detail below using some preferred embodiments, with reference to the accompanying drawings. In the drawings:

[0011] Figure 1 shows a highly simplified first preferred embodiment of a DC switching device according to the invention with a partially broken housing in the closed state,

[0012] Figure 2 is a highly simplified sketch of the embodiment according to Fig. 1 with the housing open,

[0013] Figure 3: a highly simplified second preferred embodiment of a DC switching device according to the invention with a partially broken housing in the closed state,

[0014] Figure 4 is a highly simplified sketch of the embodiment according to Fig. 3 with the housing open, and

[0015] Figure 5: a highly simplified circuit diagram of another preferred embodiment of a DC switching device according to the invention.

[0016] The invention is described in more detail below with reference to the accompanying drawings using preferred embodiments.

[0017] Figures 1 and 3 show, in highly simplified form, a first and a second embodiment of a DC switching device 100 according to the invention, respectively, with the housing partially broken open and in the closed state. Figure 5 shows, in highly simplified form, a circuit diagram of another preferred embodiment of a DC switching device 100 according to the invention.

[0018] In detail, Figs. 1, 3 and 5 each show a DC switching device 100 which is configured to couple a DC load 200 to a DC voltage source 4 via a positive conductor 8 and / or negative conductor 10. The positive conductor 8 and the negative conductor 10 are expediently each routed through the DC switching device 100. By means of the DC switching device 100, a DC voltage branch 2 is essentially configured between the DC voltage source 4 and the DC load 200. The positive and negative conductors 8, 10 can also be arranged on a printed circuit board, i.e., in particular, can be designed as conductor tracks.

[0019] As shown in the figures, the DC switching device 100 has a housing constructed from at least two housing parts 100-1, 100-2, 100-3 or is at least partially surrounded by such a housing. In Fig. 1, the housing is thus constructed from at least two housing parts 100-1, 100-2, and in Fig. 3, for example, from three housing parts 100-1, 100-2, and 100-3. In Fig. 5, the dashed line S indicates the transition or "boundary" between two housing parts 100-1 and 100-2 of the DC switching device 100.

[0020] Within the respective housing, as further shown in Figs. 1, 3, and 5, at least one first switching element 101, expediently a semiconductor-based, electronically controllable switching element, is encompassed, i.e., contained, and integrated into the positive conductor 8 and / or the negative conductor 10 for coupling and decoupling the DC voltage load 200. In Fig. 1, only one first switching element 101 is integrated into the positive conductor 8, and in Figs. 3 and 5, it is integrated into the negative conductor 10.

[0021] Furthermore, as shown in Figs. 1, 3 and 5, at least one fuse 103 can be integrated into the positive conductor 8 and / or into the negative conductor 10. Such a fuse is in particular integrated at least in the conductor in which no first switching element 101 is integrated. Accordingly, in Fig. 1 a fuse 103, in particular a safety fuse, is integrated into the negative conductor 10 and in Figs. 3 and 5 into the positive conductor 8, which is additionally marked SI in Fig. 5. Such a fuse 103 is expediently replaceable and is therefore expediently arranged so that it is accessible from outside the housing when the housing is open, so that it can therefore be easily replaced, in particular in the event of "destruction".

[0022] The switching element 101 is therefore used in particular for the operational switching of the DC voltage switching device 100, but can also be used for earth fault protection for the conductor in which it is integrated, in particular if it is designed as a controllable semiconductor switching element and is additionally marked HS in Fig. 5. Even in the event of an earth fault, the fault location can be separated from the rest of the network very quickly, expediently within a few ps, so that the current to be switched off does not become too high. The first switching element can therefore expediently switch off the conductor in which it is integrated in a few qs and thus separate the DC voltage source from the fault location before the current becomes too high. As the first switching element 101, a semiconductor-based, electronically controllable, e.g.A switching element designed as a MOSFET (metal-oxide-semiconductor field-effect transistor) or IGBT (insulated-gate bipolar transistor). On the other hand, fuses with sufficient short-circuit strength are also available, so that the conductor in which a fuse 103 is integrated can be disconnected sufficiently quickly. Thus, if both the positive and negative poles have a voltage relative to ground potential that would result in a very large fault current in the event of a ground fault, the DC switching device according to the invention expediently has a means of safely disconnecting both the positive and negative branches, even in the event of such a fault.

[0023] The DC switching devices according to the invention are characterized in that the housing has at least two housing parts that are mechanically coupled to one another and movable relative to one another, ie according to the embodiments according to Figs. 1, 3 and 5 at least two of the housing parts 100-1, 100-2, 100-3 are designed as housing parts that are mechanically coupled to one another and movable relative to one another.

[0024] These at least two of the housing parts 100-1, 100-2, 100-3 are further mechanically coupled to one another and arranged to be movable relative to one another in such a way that in a first position of these housing parts which are movable relative to one another, the housing is closed (cf. e.g. Figs. 1 and 3) and in a second position of the housing parts which are movable relative to one another, the housing is open and at least one of the positive and negative conductors 8, 10 is interrupted due to the second position. Such a second position is shown in particular in Figs. 2 and 4, which each show the embodiment according to Figs. 1 and 3 in a highly simplified manner, but with the housing open and also only in sketch form. In particular, the electrical and electronic components already discussed above with reference to Figs. 1 and 3 have been largely omitted in these sketches for reasons of clarity.

[0025] However, it can be seen in particular that an uninterrupted wiring as shown in Fig. 1 between the DC voltage source 4, starting virtually at the DC voltage branch 2 up to the DC voltage load 200, ie including the conductor 8 via the component designated 111, 112 and / or the conductor 10 via the fuse 103 and the component designated 111, 112, is interrupted in a second position as shown in Fig. 2 due to this second position and is therefore impossible. Accordingly, an uninterrupted line routing as shown in Fig. 3 between the DC voltage source 4, starting virtually at the DC voltage branch 2 up to the DC voltage load 200, ie including the conductor 10 via the component designated 111, 112 and / or the conductor 8 via the fuse 103 and the component designated 111, 112, in a system as shown in Fig.4 is interrupted due to this second position and is therefore impossible.

[0026] By means of or due to the relative positions of the at least two movable housing parts 110-1 and 100-2, the DC switching device is consequently designed with an integrated interruption mechanism which is functionally configured either to effect a closed housing, ie in the first position, or to interrupt at least one of the positive and negative conductors in an open housing, ie in the second position.

[0027] This integrated interruption mechanism is thus configured such that the possibility of electrically connecting, i.e., coupling, the DC voltage load 200, even by the at least first switching element 101, is no longer possible or effectively prevented when the housing is open in the second position of the relatively movable housing parts 100-1 and 100-2. Rather, when the housing is open, the DC voltage load 200 is always in an electrically disconnected, i.e., uncoupled, state. In particular, in the open position, the DC voltage load 200 is not only electrically but also galvanically decoupled from the DC voltage source 4, in practical implementation expediently with respect to both the positive conductor 8 and the negative conductor 10.

[0028] In order to interrupt at least one of the positive and negative conductors, two complementary electrical contact elements 111 and 112 are expediently arranged on the two housing parts 100-1 and 100-2 which are movable relative to one another, which contact elements are in mutual electrical contact when the housing is closed and are electrically and galvanically isolated from one another when the housing is open. In particular, the component designated 111, 112 in Figs. 1, 3 and 5 thus comprises a first electrical contact element 111, e.g. a contact plug, on one of the two housing parts 100-1 and 100-2 which are movable relative to one another, and a second electrical contact element 112, e.g. a contact socket, of complementary design thereto, on the other of the two housing parts 100-1 and 100-2 which are movable relative to one another, as can be seen schematically in particular in Figs. 2 and 4. I.e.1 to 5, designated 111, 112, in practical embodiments advantageously comprise two complementary electrical contact elements 111 and 112, to which the positive conductor 8 and the negative conductor 10 are electrically connected.

[0029] Alternatively or additionally, as can be seen schematically in particular from Fig. 1 to 4, it can therefore also be expediently provided that each conductor of the two positive and negative conductors 8, 10 which is interrupted when the housing is open is guided through the housing and is electrically connected to a first contact element 111 of the complementarily designed electrical contact elements within a first 100-1 or 100-2 of the two housing parts which can be moved relative to one another, and is electrically connected to a second contact element 112 of the complementarily designed electrical contact elements within the second 100-1 or 100-2 of the two housing parts which can be moved relative to one another, wherein the first electrical contact element and the second electrical contact element are in mutual electrical contact when the housing is closed and are electrically and galvanically isolated from one another when the housing is open.Furthermore, it is advantageous if at least one signal generator 114 is additionally included, which is arranged and configured to signal an opening movement in response to the movement of the two housing parts movable relative to one another from the first position towards the second position.

[0030] Consequently, if the signal contact 114 is opened in advance of the contact elements 111, 112 in the positive and / or negative conductor path 8, 10 upon opening the housing, i.e., before the housing is fully opened, a signal emitted or received by the signal contact 114, which thus signals in particular the opening movement, can be used to initially open in particular the first switching element 101. This ensures that no arc is created when the contacts in the power path of the contact elements 111, 112 in the positive and / or negative conductor path 8, 10 are subsequently opened.

[0031] For this purpose, the DC switching device can, in particular, have an evaluation device 118 connected to the signal generator 114 and the first switching element 101, which is configured to control at least the first switching element 101 to decouple the DC load in response to an opening movement signaled by the signal generator 114. Preferred control paths of such an evaluation device 118 are shown in dashed lines in Figs. 1, 3, and 5.

[0032] As can be seen in Figs. 1, 3 and 5, a second switching element 106, in particular an electromechanical switching element, in particular a relay contact, for coupling and uncoupling the DC voltage load 200 can optionally be accommodated, in particular in the housing, which is integrated into one of the positive and negative conductors 8, 10. As can also be seen in the figures, however, a third switching element 106, in particular an electromechanical switching element, in particular a relay contact, for coupling and uncoupling the DC voltage load 200 can then also be accommodated, in particular in the housing, which is integrated into the other of the positive and negative conductors 8, 10.

[0033] It is also advantageous if, in such a case, the evaluation device 118 is also connected to the second switching element 106 or also to the third switching element 106. Due to the leading opening of the signal generator 114, the signal signaling the opening movement can consequently also be used not only to initially open the first switching element 101, but additionally or alternatively also to initially open the second and, if appropriate, also the third switching element 106. This also ensures that no arc is generated in the positive and / or negative conductor path 8, 10 upon subsequent opening of the contacts in the power path of contact elements 111, 112.

[0034] In order to move the at least two housing parts 100-1, 100-2, 100-3, which are movable relative to one another, from the first position to the second position and vice versa, it is therefore also expedient to include an actuating mechanism 115a, 115b, 115c, which is arranged and configured accordingly for this purpose, in particular is manually operable. Based on the embodiments outlined in the figures, the actuating mechanism for manual operation can thus, for example, have a hand actuator 115a, which is mechanically coupled to the at least two housing parts 100-1, 100-2, 100-3, which are movable relative to one another, via suitably configured bearings 115b. As an alternative to the actuating mechanism 115a, 115b, 115c, which is arranged and configured accordingly for this purpose, in particular is manually operable.In addition to the embodiment of a manual actuator outlined above, such or a similar manual actuator can also be mechanically coupled in a different way to the at least two housing parts 100-1, 100-2, 100-3 that are movable relative to one another, or the actuating mechanism can also be designed differently overall, e.g., electrically, hydraulically, or pneumatically. Furthermore, in an expedient embodiment, the actuating mechanism can further comprise appropriately suitable bearings 115c at least between the at least two housing parts 100-1, 100-2, 100-3 that are movable relative to one another, so that they can move relative to one another between the first position and the second position without having to be completely physically separated from one another to open the housing.

[0035] The evaluation device 118 can further be connected to a sensor 116 for evaluating a detected current flow, which sensor 116 is expediently connected at least for detecting the current flow of the conductor in which the first switching element 101 is integrated. In Fig. 5, such a sensor 116, according to an expedient embodiment, has a sensor element arranged in series with the first switching element 101 for detecting the current flow of this conductor. The sensor element detecting this current flow is additionally marked with "CS". In a practical embodiment, the evaluation device 118 can thus also be configured to compare the detected current flow with a threshold value and to activate the at least one switching element 101. For this purpose, the evaluation device 118 can, for example, have an analog circuit, a discrete circuit, or preferably also a PC (microcontroller).If, depending on the design and / or field of application, the current flow exceeds or falls below a threshold value, in particular a predetermined one, then the first switching element 101 is expediently activated, ie in particular switched off, at least initially to decouple the load 200 from the source 4.

[0036] If, therefore, a second and optionally a third switching element 106 is additionally included for coupling and decoupling the DC voltage load 200, this can also additionally achieve galvanic decoupling of the load 200 from the source 4, in particular similarly by means of the evaluation device 118. For this purpose, the second and third switching elements 106 can therefore also expediently have relay contacts, additionally marked K1 and K2 in Fig. 5, respectively. However, such relay contacts are rather unsuitable for rapid shutdown, since the time until disconnection is in the ms range.

[0037] Consequently, if the current flow detected and evaluated by the evaluation device 118 exceeds a predetermined critical value, then, depending on the value exceeded and the special design, the first switching element 101 or, additionally, the second and third switching elements 106 can be switched off by the evaluation device 118, thus electrically or galvanically decoupling the DC voltage branch from the DC voltage source 4. Furthermore, by switching off the second and third switching elements 106, current flow is prevented in both directions, whereas switching off only the first switching element 101 prevents current flow in only one direction. The second and third switching elements 106 thus always ensure reliable galvanic isolation of the DC output from the DC input.The evaluation device 118 is further preferably configured to take into account, at least for switching off the first switching element 101, when a current flow change rate predetermined by the threshold value is exceeded. In other words, alternatively or additionally, in particular to the current amplitude, the current flow change rate and / or the current direction can also be compared with a threshold value and, upon exceeding this value, lead to the switching off of the first switching element (101). Expediently, during an evaluation against a threshold value, in particular in addition to a comparison of the current amplitude, a comparison of the current flow change rate and / or the current direction is also carried out, and, upon exceeding the threshold value, leads to switching off.

[0038] In a suitable further development, the evaluation device 118 further has a signal output or a communication interface, specifically for outputting 119 a signal when the threshold value is exceeded and / or when the threshold value is not exceeded but the detected current flow has a greater value in absolute terms than a second threshold value which is smaller in absolute terms than the threshold value. Thus, by comparing it with a threshold value, it is extremely useful to also take into account, in a variety of flexible ways, tolerable current changes, fluctuations and / or losses during operation of the DC voltage load. Furthermore, the evaluation device 118 is expediently not only designed and configured to decoupling the DC voltage load 200 orto effect the electrical and / or galvanic coupling of the DC voltage load 200 or the entire DC voltage branch 2 to the DC voltage source 4 by means of corresponding activation commands to the first switching element 101 or the further switching elements 106, i.e. to switch it or them off, but also to effect the electrical and / or galvanic coupling of the DC voltage load 200 or the entire DC voltage branch 2 to the DC voltage source 4 by means of corresponding activation commands to the switching element or the switching elements, i.e. to switch it or them on. In particular, a command to the evaluation device 118 for effecting the switching on based thereon can, according to an expedient embodiment, be received by the evaluation device 118, for example, also via a communication interface as described above or via another input interface, in particular a digital input.With a DC switching device as described above in various embodiments, it is therefore also possible to implement in particular a switching system in which at an input IN+, IN- of the DC switching device.

[0039] 100, the positive conductor 8 and the negative conductor 10 are connected to the DC voltage source 4, and at an output OUT+, OUT- of the DC switching device 100, a DC voltage branch can be coupled and uncoupled to the DC load 200 via the positive conductor 8 and the negative conductor 10 (see Fig. 5). As a rule, the DC voltage of the DC voltage source 4 is usually generated from a three-phase AC network with LI, L2, L3 by means of a rectifier GR, whereby the rectification can be carried out actively with a power electronic circuit or passively with diodes.

[0040] Even if not shown in the figures, in a further development, an electromechanical switching element can optionally also be connected in parallel to the first switching element 101 and configured, in the coupling state of the first switching element

[0041] 101 to assume a closed state. By means of such a configuration, the additional electromechanical switching element arranged parallel to the first switching element 101 can reduce power loss if the first switching element 101 is in an electrically conductive state when this additional, parallel-arranged electromechanical switching element is closed. In particular, by connecting the additional electromechanical switch, conduction losses of the first switching element 101 can also be reduced when the first switching element 101 is in an electrically conductive state.

[0042] Taking into account the description here, the DC load does not have to be a single load, but can be composed of a group of DC loads or can be designed as a DC network with a plurality of DC loads operated across it.

[0043] In summary, it can therefore be stated in particular that the invention proposes an additional isolating function or an additional interruption mechanism. This is particularly advantageous when, for example, the normative requirements for a DC switching device, i.e. for a disconnector in general, are not met by relay contacts alone. At least two parts of a device housing are designed to be movable relative to one another and are mechanically coupled to one another so that there is a closed housing position in a first position and an open housing position in a second position. For this purpose, at least two of these movable housing parts each contain electrical contact elements which are designed to be complementary to one another so that when the housing is closed the electrical contact elements are also closed and a current flow from the device input to the device output is fundamentally possible.When the housing is open, the electrical contact elements are also open and current flow is therefore no longer possible under any circumstances, as the device input is electrically and galvanically separated from the device output by the open contact elements. In addition to these contact elements in the positive and / or negative branch, it is advisable to provide at least one further signal contact or signal generator which leads the electrical contact elements in the positive and / or negative branch during the opening process. By opening the signal contact or signal generator, the switching elements contained in the DC device, i.e. in particular one or more semiconductor switches and / or relay contacts, can be deactivated at an early stage, in particular individually and flexibly.This ensures that during the opening process the electrical shutdown occurs before the electrical contact elements in the positive and / or negative branch open, thus avoiding an arc.

[0044] List of reference symbols

[0045] 2 DC branch

[0046] 4 DC voltage source

[0047] 8 positive conductors

[0048] 10 negative conductors

[0049] 100 DC switching devices

[0050] 100-1, 100-2, 100-3 Housing parts of the DC switching device

[0051] 101 first switching element

[0052] 103 Security

[0053] 106 second, third switching element I ll, 112 electrical contact elements

[0054] 114 signal generators

[0055] 115a, 115b, 115c operating mechanism

[0056] 116 Sensor 118 From Value Device

[0057] 119 Output of signal output or communication interface 00 DC load

[0058] S Transition or boundary between two housing parts of the

[0059] DC switching device

Claims

Patent claims 1. A DC voltage switching device (100) for coupling a DC voltage load (200) via a positive conductor (8) and / or negative conductor (10) to a DC voltage source (4), wherein the DC voltage switching device has a housing or is at least partially surrounded by a housing, and wherein at least one first switching element (101), in particular a semiconductor-based, electronically controllable switching element, is included within the housing and is integrated into the positive conductor (8) and / or the negative conductor (10) for coupling and uncoupling the DC voltage load (200), characterized in that the housing has at least two housing parts (100-1, 100-2) that are mechanically coupled to one another and movable relative to one another,wherein in a first position of these two housing parts movable relative to one another, the housing is closed and in a second position of the housing parts movable relative to one another, the housing is opened and at least one of the positive and negative conductors (8, 10) is interrupted due to the second position.

2. DC voltage switching device according to claim 1, in which, for interrupting at least one of the positive and negative conductors, complementary electrical contact elements (111, 112) are arranged on the two housing parts (100, 100a) which are movable relative to one another, which are in mutual electrical contact when the housing is closed and are electrically and galvanically separated from one another when the housing is open, and / or in which each conductor of the two positive and negative conductors (8, 10) which is interrupted when the housing is open is guided through the housing (100,100a) and within a first of the two housing parts (100-2) which are movable relative to one another, the complementarily designed electrical contact elements are electrically connected to a respective first contact element (111) and within the second of the two housing parts (100-1) which are movable relative to one another, the complementarily designed electrical contact elements are electrically connected to a respective second contact element (112), wherein the respective first electrical contact element and the respective second electrical contact element are in mutual, electrical contact are electrically and galvanically separated from each other when the housing is open.

3. DC voltage switching device according to one of claims 1 to 2, further comprising at least one signal transmitter (114) which is arranged and configured to signal an opening movement in response to the movement of the two housing parts which are movable relative to one another from the first position towards the second position.

4. DC switching device according to claim 3, which further comprises a signal generator (114) and the first switching element (101) connected From value device (118) which is arranged to control at least the first switching element (101) for decoupling the DC load in response to an opening movement signaled by the signal generator (114).

5. DC voltage switching device according to one of claims 1 to 4, wherein a second switching element (106), in particular an electromechanical switching element, for coupling and uncoupling the DC voltage load (200) is accommodated, in particular is accommodated in the housing, wherein the second switching element (106) is integrated into one of the positive and negative conductors (8, 10).

6. DC switching device according to claim 5, wherein a third switching element (106), in particular an electromechanical switching element, for coupling and uncoupling the DC load (200) is accommodated, in particular in the housing, which is integrated in the other of the positive and negative conductors (8, 10).

7. DC switching device according to claim 4 and 5, wherein the From value device (118) is also connected to the second switching element (106).

8. DC switching device according to claim 4 and 6, wherein the From value device (118) is also connected to the third switching element (106).

9. DC voltage switching device according to one of claims 1 to 8, wherein a fuse (103) is integrated into the positive conductor (8) and / or into the negative conductor (10), in particular at least in the conductor in which the first switching element (101) is not integrated, which fuse is arranged in particular integrated within the housing and is replaceable and accessible from outside the housing when the housing is open.

10. DC voltage switching device according to one of claims 1 to 9, in which an actuating mechanism (115a, 115b, 115c) is included, which is arranged and configured, in particular manually operable, for moving the two housing parts (100-1, 100-2) movable relative to one another from the first position into the second position and vice versa, and / or in which an electromechanical switching element is connected in parallel to the first switching element (101) and configured to assume a closed state in the coupled state of the first switching element.

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