Electronically switching low-voltage circuit breaker device

Abstract

The invention relates to an electronically switching low-voltage circuit breaker device (1), having an insulating material housing (2) with a front face (3), a securing face (4) opposite the front side (3), and narrow and broad faces (5, 6) connecting the front and securing face (3, 4). The insulating material housing (2) has at least two housing sections (2-1, 2-2, 2-3, 2-4) which are arranged next to each other in a normal direction of the broad faces (6), wherein a respective mechanical switch contact (7) with a fixed contact (8) and a movable contact (9) which can be moved relative thereto is arranged in each housing section (2-1, 2-2, 2-3, 2-4). The circuit breaker device (1) additionally has a switching mechanism (20) and a rotatably mounted switching shaft (30) which is mechanically coupled to the switching mechanism and which extends over all of the housing sections (2-1, 2-2, 2-3, 2-4). The movable contacts (9) are secured to the switching shaft (30) and can be actuated by rotating the switching shaft (30). The circuit breaker device (1) additionally has a manually actuatable push button (40), which is operatively connected to the switching shaft (30) via the switching mechanism (20) and which can be moved between a first position and a second position in order to activate or deactivate the circuit breaker device (1), said switching mechanism (30) being received and held in the first (2-1) housing section of the at least two housing sections (2-1, 2-2, 2-3, 2-4). Thus, a design of the electronically switching low-voltage circuit breaker device (1) can be provided which is both compact and easy to install.

Description

[0001] Description

[0002] Electronically switching low-voltage protective switching device

[0003] The invention relates to an electronically switching low-voltage protective switching device with an insulating housing, having a front side, a fastening side opposite the front side and narrow and wide sides connecting the front and the fastening side.

[0004] Switching devices are used in industrial low-voltage circuits and networks to connect consumers to the network and to perform protective tasks in the electrical network. Classic electromechanical switching devices are devices which have a clearly defined range of functions. These include, for example, circuit breakers, miniature circuit breakers or residual current devices, but also (load) disconnectors or arc or fire protection switches. They all serve to monitor and protect an electrical circuit and are used in particular as switching and safety elements in electrical power supply and distribution networks. For example, a classic electromechanical circuit breaker can carry current and control and switch overcurrents and short-circuit currents. The devices are developed and approved in accordance with product standards.With a technological shift from traditional contact-based switching to power electronic switching using semiconductors, the existing fixed functional scopes are being called into question. A power semiconductor is capable of performing various electrical tasks both quickly and frequently.

[0005] The term "low voltage" refers to electrical voltages up to 1000 volts AC or 1500 volts DC. In particular, the term "low voltage" refers to voltages that are greater than the so-called extra-low voltage, with values ​​of 50 volts AC or 120 volts DC.

[0006] Furthermore, the term "low-voltage circuit" refers to circuits for currents up to 6300 amperes, more specifically currents up to 1600 amperes, 1200 amperes, 630 amperes, 125 amperes, 80 amperes, 63 amperes, 40 amperes, 25 amperes or 16 amperes. The current values ​​mentioned refer in particular to nominal and / or breaking currents, i.e. the maximum current that is normally carried through the circuit or at which the electrical circuit is usually interrupted - for example by a switching device or a protective switching device.

[0007] Disconnectors or isolating switches are electrical actuation systems designed for the manual, load-free (currentless) electrical isolation of low-voltage electrical circuits or systems (parts). Electrical isolation under load is not possible, or only possible to a limited extent, using conventional isolators and can lead to the destruction of the isolator due to an arc generated during the isolation process.

[0008] In contrast, load disconnectors or switch-disconnectors are electrical actuating systems designed for the manual electrical disconnection of low-voltage electrical circuits or systems (parts) under load. For this purpose, load disconnectors have, for example, an arc quenching device by means of which an arc created during electrical disconnection under load can be directed away from the switching elements of the load disconnector and extinguished in a heat-resistant section of the arc quenching device, such as an arc quenching chamber. This prevents thermal overload of sensitive components of the load disconnector caused by the arc. A special type of disconnector or switch-disconnector is a fused load disconnector, such as a fuse switch-disconnector or fuse switch-disconnector.These are load breakers which also have an electrical melting fuse, for example a so-called NH fuse.

[0009] In contrast, circuit breakers, miniature circuit breakers and residual current devices are known, which interrupt the circuit automatically when certain overcurrent, short-circuit or fault current conditions occur. After the interruption, these switching devices can be switched on again (relatively quickly). Manual switching off is also provided. Circuit breakers, miniature circuit breakers and residual current devices are protective switching devices that function in a similar way to a fuse: they are installed in the circuit of an electrical consumer, monitor the current flowing through them and interrupt it when a predefined protection parameter, for example a current or current-time limit, is exceeded.This interruption of the low-voltage circuit, which is also referred to as tripping, occurs mechanically by an (automatic) opening of one or more mechanical contacts.

[0010] For some years now, (purely) electronic switching devices, in which the reduction or interruption of the electrical current is carried out by semiconductors, have been developed and offered on the market. These "semiconductor switches", which are referred to in English technical literature as "solid state circuit breakers (SSCBs)", have an electronic switching unit by means of which a purely semiconductor-based closing and opening of an electrical connection can be realized. The question remains as to what a space-saving and cost-effective design concept for such an electronically switching low-voltage protective switching device could look like.

[0011] It is therefore the object of the present invention to provide a space-saving and cost-effective construction concept for such an electronically switching low-voltage protective switching device.

[0012] This object is achieved according to the invention by the electronically switching low-voltage protective switching device according to claim 1. Advantageous embodiments are the subject of the dependent claims.

[0013] The electronically switching low-voltage protective switching device according to the invention has an insulating housing with a front side, a fastening side opposite the front side, and narrow and wide sides connecting the front and the fastening side. The insulating housing has at least two housing sections arranged next to one another in a normal direction to the wide sides, with a mechanical switching contact having a fixed contact and a moving contact that can be moved relative to it being arranged in each housing section. The protective switching device also has a switching mechanism and a rotatably mounted switching shaft that is mechanically coupled thereto and extends over all housing sections. The moving contacts are fastened to the switching shaft and can be actuated by rotating the switching shaft.Furthermore, the protective switching device has a manually operable push button which is operatively connected to the switching shaft via the switching mechanism and can be moved between a first position and a second position in order to switch the protective switching device on or off, wherein the switching mechanism is accommodated and held in the first of the at least two housing sections. The electronically switching low-voltage protective switching device is also referred to as a "semiconductor switch" or "semiconductor switching device". The switching, i.e. the switching off and re-switching on, of the electrical current is implemented with the aid of power semiconductors; the mechanical switching contacts only serve to provide additional galvanic isolation of the monitored load circuit from the supply network, for example in order to carry out work on the load circuit.

[0014] The electronically switching low-voltage protective switching device is a multi-pole switching device, with each housing section being assigned a so-called "pole" or "switching pole": in the case of a two-pole switching device, these are the neutral conductor and one phase conductor; in the case of a three- or four-pole switching device, the neutral conductor and two or three phase conductors. The switching shaft with the moving contacts arranged on it is rotatably mounted in the insulating material housing and extends from one broad side of the insulating material housing to the other across all housing sections, so that a switching contact is arranged in each housing section.

[0015] The protective switching device can be manually switched on or off by pressing a manually operated push button which is operatively connected to the switching shaft via the switching mechanism - for example mechanically coupled - and can be moved linearly between a first position and a second position. For reasons of space, the switching mechanism is accommodated and held in the insulating housing in the first of the at least two housing sections, in which the switching contact for the neutral conductor is also arranged. This is because the neutral conductor is not additionally interrupted by a power semiconductor, which is why no electronic switching unit for the neutral conductor needs to be arranged, i.e. accommodated and held, in the first housing section.In an advantageous further development, the electronically switching low-voltage protective switching device has a status display device which is arranged on the front side of the insulating material housing.

[0016] With the aid of the status display device, which may, for example, comprise an indicator or a display, the status of the electronically switching low-voltage protective switching device can be displayed on the front of the insulating material housing and read from the outside, thereby improving the user-friendliness of the protective switching device.

[0017] In a further advantageous development of the electronically switching low-voltage protective switching device, the status display device and / or the manually operable push button is accommodated and held in the first of the at least two housing sections in the insulating material housing.

[0018] Since the first housing section is assigned to the neutral conductor, this housing section provides unused space in which the status indicator and / or the manually operable push button can be located, due to the electronic switching unit not required to interrupt the neutral conductor. Furthermore, this arrangement ensures spatial proximity of the status indicator to the manually operable push button, further improving user-friendliness.

[0019] In a further advantageous development, the electronically switching low-voltage protective switching device has an electronic tripping unit which is coupled to the switching mechanism in such a way that tripping of the electronic tripping unit causes the switching contacts to open.

[0020] The electronic trip unit can be controlled electronically, for example, by a control unit of the electronically switching low-voltage protective device. Through the coupling with the switching mechanism, which can be mechanical, electrical or magnetic, for example, the switching contacts can be opened by tripping the electronic trip unit - initiated, for example, by the control unit. In this way, galvanic isolation can be initiated via the control unit of the electronically switching low-voltage protective device by opening the switching contacts. This galvanic isolation can also be initiated remotely, provided the electronically switching low-voltage protective device has appropriate communication means for remote control.

[0021] In a further advantageous development of the electronically switching low-voltage protective switching device, the electronic trip unit is arranged in the second housing section of the insulating material housing, adjacent to the first housing section. This results in the advantage that the electronic trip unit is arranged near the switching mechanism, so that, in particular, a mechanical coupling to the switching mechanism is easier to implement.

[0022] In a further advantageous development of the electronically switching low-voltage protective switching device, a switching mechanism assembly with its own housing is formed by the switching mechanism and the switching shaft.

[0023] By combining the switching mechanism with the switching shaft to form an independent switching mechanism assembly, which has its own housing in which the individual components of the switching mechanism and the switching shaft are accommodated and held, the assembly of these components in the insulating housing of the electronically switching low-voltage protective device is made much easier. In a further advantageous development of the electronically switching low-voltage protective device, the status display device and / or the electronic tripping unit are also accommodated and held in the switching mechanism assembly. In this way, the assembly of these components in the insulating housing of the electronically switching low-voltage protective device can be further simplified.

[0024] In a further advantageous development of the electronically switching low-voltage protective switching device, each of the at least two housing sections has a width of one division unit.

[0025] In the case of low-voltage switching devices, the term "spacing unit" defines a pitch dimension which has a width of one ts inch, which corresponds to approximately 18 mm. Accordingly, a two-pole device has a width of two pitch units, a three-pole device has a width of three pitch units, and a four-pole device has a width of four pitch units. These standard widths mean that the electronically switching low-voltage protective switching device can be used for a wide variety of electrical installations.

[0026] In a further advantageous development of the electronically switching low-voltage protective switching device, the front side has a protruding central section and connection sections which are set back towards the narrow sides, whereby a head region of the insulating material housing is formed, wherein the switching mechanism and the switching shaft are arranged in the head region of the insulating material housing.

[0027] The head area, which is limited by the central area of ​​the front, the two wide sides and the sections of the narrow sides adjacent to the central section, represents a construction volume within the insulating material housing in which the switching mechanism and the switching shaft can be arranged in a space-saving manner in such a way that the packaging, i.e. the spatial arrangement of the assemblies and components within the insulating material housing, as well as the assembly can be significantly simplified.

[0028] In a further advantageous development of the electronically switching low-voltage protective switching device, the insulating material housing has a lower housing shell which comprises the entire fastening side as well as sections of the narrow and wide sides, and an upper housing shell which is mechanically connected to the lower housing shell and which comprises the entire front side as well as further sections of the narrow and wide sides.

[0029] In this so-called "pot-and-lid construction", assembly is carried out by inserting the assemblies and components into the lower or upper housing shell. Once all assemblies and components have been accommodated and held in the two housing shells, they are mechanically connected to one another in a final assembly step, for example via one or more snap connections.

[0030] In the following, exemplary embodiments of the electronically switching low-voltage protective device according to the invention are explained in more detail with reference to the attached figures. In the figures:

[0031] Figures

[0032] 1 and 2 are schematic representations of the electronically switching low-voltage protective switching device according to the invention in different views;

[0033] Figure 3 is a schematic representation of a pre-assembled switching mechanism assembly of the electronically switching low-voltage protective switching device according to the invention in a perspective view; Figures

[0034] 4 and 5 are schematic representations of further embodiments of the electronically switching low-voltage protective switching device according to the invention;

[0035] Figure 6 is a schematic representation of the functioning of the switching mechanism of the electronically switching low-voltage protective switching device according to the invention;

[0036] In the various figures of the drawing, identical parts are always provided with the same reference symbol. This description applies to all drawing figures in which the corresponding part can also be seen.

[0037] Figures 1 and 2 schematically illustrate various views of a first exemplary embodiment of the electronically switching low-voltage protective switching device 1 according to the invention. Figure 1 shows a side view of the low-voltage protective switching device 1, with a front housing side omitted to allow a view into the interior of the low-voltage protective switching device 1. Figure 2 shows a plan view of the low-voltage protective switching device 1, with the housing front omitted to allow a view into the interior of the low-voltage protective switching device 1.

[0038] The low-voltage protective switching device 1 has an insulating housing 2 with a front side 3, a fastening side 4 opposite the front side 3 and narrow and wide sides 5, 6 connecting the front and the fastening sides 3, 4. Furthermore, the insulating housing 2 has four housing sections 2-1, 2-2, 2-3 and 2-4 arranged next to one another in a normal direction of the wide sides, wherein in each of the housing sections 2-1, 2-2, 2-3 and 2-4 a switching contact 7 is arranged with a fixed contact 8 arranged in a fixed position in the insulating housing 2 and with a moving contact 9 which can be moved relative to the fixed contact 8. Each of the housing sections 2-1, 2-2, 2-3 and 2-4 has a width of one pitch unit (1TE corresponds to approximately 18mm), whereby a four-pole low-voltage protective switching device 1 with a width of four pitch units is formed.However, the housing sections 2-1, 2-2, 2-3 and 2-4 do not represent a structural subdivision in the sense of independent housing modules which, when assembled together, form the insulating housing, but rather the internal subdivision of the integrated insulating housing 2.

[0039] 1 by the first electrical connection 14. The output connection 12 is electrically connected directly or indirectly to the moving contact 9 of the switching contact 7, indicated schematically in Figure 1 by the second electrical connection 15.

[0040] The low-voltage protective switching device 1 also has a switching mechanism 20 accommodated and held in the insulating material housing 2, as well as a manually operable push button 40 arranged in the area of ​​the front side 3 on the insulating material housing 2. For reasons of space, the switching mechanism 20 is accommodated and held exclusively in the first housing section 2-1. With the aid of the manually operable push button 40, which is operatively connected to the switching mechanism 20, for example mechanically coupled, and can be moved between a first position and a second position, the low-voltage protective switching device 1 can be switched on or off manually. The operative connection between the switching mechanism 20 and the push button 40 is shown only schematically in Figures 1 and 2 by an operative line 49.

[0041] Furthermore, the low-voltage protective switching device 1 has a switching shaft 30 which is rotatably mounted in the insulating material housing 2 and is operatively connected, for example mechanically coupled, to the switching mechanism 20. This operative connection between the switching mechanism 20 and the switching shaft 30 is again only schematically illustrated in Figures 1 and 2 by a further line of action 39. The switching shaft 30 extends over all housing sections 2-1, 2-2, 2-3 and 2-4, with an axis of rotation 31 of the switching shaft 30 being oriented orthogonally to the broad sides 6 of the insulating material housing 2. The moving contact 9 of the switching contact 7 arranged in the respective housing section 2-1, 2-2, 2-3, 2-4 is fastened to the switching shaft 30 and can be moved by rotating the switching shaft 30 in such a way that the respectively assigned switching contact 7 can be opened and closed.

[0042] In order to interrupt the circuit protected by the low-voltage protective switching device 1 if necessary, the low-voltage protective switching device 1 has an electronic tripping unit 50 which can be electronically controlled in the event of predefined events, for example a short circuit, a fault current or an electrical overload, in order to interrupt the electrical current flowing through the protected circuit and to galvanically isolate the circuit from the electrical supply network. For this purpose, the electronic tripping unit 50 is coupled to the switching mechanism 20 in such a way that triggering of the electronic tripping unit 50 causes the switching contacts 7 to open. This active connection between the electronic tripping unit 50 and the switching mechanism 20 is again shown only schematically in Figure 2 by a further active line 59.

[0043] In the illustration in Figure 2, the electronic trip unit 50 is accommodated and held in the insulating housing 2 in the area of ​​the second housing section 2-2. However, this is merely an example and not essential to the invention: in principle, it would also be possible to arrange the electronic trip unit 50 in the area of ​​the first housing section 2-1 in the insulating housing 2, provided that no space restrictions or design reasons speak against it.

[0044] Furthermore, the low-voltage protective switching device 1 has a status display device 60, which is arranged on the front side 3 of the insulating housing 2 in order to provide an operator or service technician with information about the current status of the low-voltage protective switching device 1 in the assembled state. In the exemplary embodiment shown in Figures 1 and 2, the status display device 60 is formed next to the push button 40 in the region of the first housing section 2-1. However, this is to be understood merely as an example and not essential to the invention: it would also be possible to arrange the status display device 60 and / or the push button 40 in the region of the adjacent housing section 2-2 on the front side 3 of the insulating housing 2.

[0045] The front side 3 of the low-voltage protective switching device 1 shown in Figures 1 and 2 is not flat, but has the shape typical for low-voltage switching devices according to the IEC standard, with a protruding central section 3-1 and connection sections 3-2 that recede towards the narrow sides 5. As a result, a structural volume is formed in a head region of the insulating housing 2, in which, in the low-voltage protective switching device 1 according to the invention, the switching mechanism 20 and the switching shaft 30, among other things, are arranged.

[0046] 1 and 2 is divided into two horizontally and has a lower housing shell which comprises the entire fastening side as well as sections of the narrow and wide sides, and an upper housing shell which is mechanically connected to the lower housing shell and which comprises the entire front side as well as further sections of the narrow and wide sides. The head region of the insulating housing 2 is thus completely accommodated in the upper housing shell. To clarify the division of the insulating housing 2 into lower and upper housing shells, a horizontal division plane 13 is shown in Figure 1. The vertical position of the division plane 13 is not essential to the invention - it can be arranged higher or lower. Also, the division plane 13 does not have to lie in a single plane - it can also run in several planes.

[0047] Figure 3 schematically shows a preassembled switching mechanism assembly of the electronically switching low-voltage protective switching device 1 according to the invention, which, in addition to the switching mechanism 20, also includes the switching shaft 30 with the moving contacts 9 mounted thereon, the push button 40, and the electronic trip unit 50. The switching mechanism assembly has its own housing 21 in which the individual elements of the assembly are accommodated and held. Furthermore, the status display device 60 could also be integrated into the switching mechanism assembly and accommodated and held in its housing 21.

[0048] The operative connection between the electronic tripping unit 50 and the switching mechanism 20 is realized here with the aid of a mechanical transmission element 51, which is designed to act on the switching mechanism 20 if necessary in order to cause the switching contacts 7 to open in the event of an electronically initiated tripping of the electronically switching low-voltage protective switching device 1.

[0049] Due to the independent housing 21, all components of the switching mechanism assembly can be pre-assembled outside of the insulating housing 2, so that only the switching mechanism assembly needs to be inserted into the upper housing shell of the insulating housing 2, which makes the assembly work much easier.

[0050] Figures 4 and 5 schematically show further embodiments of the electronically switching low-voltage protective switching device 1 according to the invention. Both figures show a plan view of the low-voltage protective switching device 1 (similar to the illustration in Figure 2), wherein the housing front has again been omitted in order to allow a view into the interior of the low-voltage protective switching device 1. In contrast to the illustration in Figure 2, Figure 4 shows a two-pole embodiment of the electronically switching low-voltage protective switching device 1 according to the invention; Figure 5 schematically shows a three-pole embodiment.

[0051] As already described in relation to Figure 2, it is also essential to the invention in the embodiments shown in Figures 4 and 5 that the switching mechanism 20 is received and held in the first housing section 2-1, wherein each of the housing sections 2-1, 2-2 and 2-3 has a width of one division unit.

[0052] Figure 6 shows a schematic illustration of the mode of operation of the switching mechanism 20 of the electronically switching low-voltage protective switching device 1 according to the invention. The switching mechanism 20 is accommodated and held in the housing 21 and has a rotatably mounted drive lever 22 which is mechanically coupled to the push button 40 via a drive rod 23. The drive lever 22 is mechanically coupled to a release lever 24 of the switching mechanism 20, which is guided in a guide rail 26, via a bracket 25. When the low-voltage protective switching device 1 is switched on, i.e. when the push button 40 is pressed downwards, the drive lever 22 is moved counterclockwise via the drive rod 23, as a result of which the release lever 24, driven via the bracket 25, is moved to the right in the guide rail 26.A lower end of the release lever 24 rests on a pawl 27 which is rotatably mounted in the housing 21, whereby the upper end of the release lever 24 is moved to the right as the movement continues. This upper end of the release lever 24 is mechanically coupled to the switching shaft 30 via a further bracket 28 in such a way that the latter is moved clockwise, whereby the moving contact 9 is moved in the direction of the fixed contact 8 until the switching contact 7 is closed. The required contact force is applied by a contact spring 32 which acts on the switching shaft 30 and is supported in the housing 21 for this purpose.

[0053] When the switching contact 7 is closed, the pawl 27 has reached the right-hand end of the gate 26. By moving the pawl 27 clockwise, for example initiated by the electronic trip unit 50, the latching point between the trip lever 24 and the pawl 27 is released. The lower end of the trip lever 24 is no longer supported and is therefore moved further to the right, whereby the upper end of the trip lever 24 is moved to the left, since the bracket 25 fixes the trip lever 24 at the right end of the gate 26. By moving the upper end of the trip lever 24 to the left, the switching shaft 30 is set in motion counterclockwise, whereby the switching contact 7 is opened. To return the drive lever 22 and the pawl 27 to their original positions, a return spring 29 is provided, which is supported in the housing 21 and acts accordingly on the drive lever 22 and the pawl 27.Reference symbol list:.

[0054] 1 Low-voltage protective switching device

[0055] 2 I insulating material housing

[0056] 2- 1 first housing section

[0057] 2-2 second housing section

[0058] 2-3 third housing section

[0059] 2-4 fourth housing section

[0060] 3 Front

[0061] 3- 1 middle section

[0062] 3-2 Connection section

[0063] 4 Mounting side

[0064] 5 Narrow side

[0065] 6 Broadside

[0066] 7 Switch contact

[0067] 8 fixed contact

[0068] 9 Moving contact

[0069] 11 Input connector

[0070] 12 Output connector

[0071] 13 Division level

[0072] 14 first electrical connection

[0073] 15 second electrical connection

[0074] 20 switching mechanism

[0075] 21 housings

[0076] 22 drive levers

[0077] 23 Drive rod

[0078] 24 release levers

[0079] 25 brackets

[0080] 26 backdrop

[0081] 27 jack

[0082] 28 brackets

[0083] 29 Return spring

[0084] 30 shift shaft

[0085] 31 axis of rotation

[0086] 32 Contact spring 39 Line of action

[0087] 40 push buttons

[0088] 49 Line of action

[0089] 50 electronic trip unit

[0090] 51 transmission element

[0091] 59 Effective line 60 Status display device

Claims

Patent claims 1. Electronically switching low-voltage protective device ( 1 ), - with an insulating housing (2) with a front side (3), a fastening side (4) opposite the front side (3) and narrow and wide sides (5, 6) connecting the front and the fastening side (3, 4), having at least two housing sections (2-1, 2-2, 2-3, 2-4) arranged next to one another in a normal direction of the wide sides (6), wherein in each housing section (2-1, 2-2, 2-3, 2-4) a switching contact (7) with a fixed contact (8) and a moving contact (9) movable relative thereto is arranged, - with a switching mechanism (20) and a mechanically coupled, rotatably mounted switching shaft (30) which extends over all housing sections (2-1, 2-2, 2-3, 2-4), wherein the moving contacts (9) are attached to the switching shaft (30) and can be actuated by rotating the switching shaft (30), - with a manually operable push button (40) which is operatively connected to the switching shaft (30) via the switching mechanism (20) and is movable between a first position and a second position in order to switch the protective switching device (1) on or off, - wherein the switching mechanism (20) is received and held in the first (2-1) of the at least two housing sections (2-1, 2-2, 2-3, 2-4).

2. Electronically switching low-voltage protective switching device (1) according to claim 1, comprising a status display device (60) which is arranged on the front side (3) of the insulating housing (2).

3. Electronically switching low-voltage protective switching device (1) according to one of the preceding claims, wherein the status display device (60) and / or the manually operable push button (40) is accommodated and held in the first (2-1) of the at least two housing sections (2-1, 2-2, 2-3, 2-4).

4. Electronically switching low-voltage protective switching device (1) according to one of the preceding claims, with an electronic tripping unit (50) which is coupled to the switching mechanism (20) in such a way that tripping of the electronic tripping unit (50) causes the switching contacts (7) to open.

5. Electronically switching low-voltage protective switching device (1) according to claim 4, wherein the electronic tripping unit (50) is arranged in the second housing section (2-2) of the insulating material housing (2) adjacent to the first housing section (2-1).

6. Electronically switching low-voltage protective switching device (1) according to one of the preceding claims, wherein the switching mechanism (20) with the switching shaft (30) forms a mechanical switching mechanism assembly with its own housing (21).

7. Electronically switching low-voltage protective switching device (1) according to claim 6, wherein the status display device (60) and / or the electronic trip unit (50) is also accommodated and held in the switching mechanism assembly.

8. Electronically switching low-voltage protective switching device (1) according to one of the preceding claims, wherein each of the at least two housing sections (2-1, 2-2, 2-3, 2-4) has a width (B) of one pitch unit.

9. Electronically switching low-voltage protective switching device (1) according to one of the preceding claims, wherein the front side (3) has a protruding central section and connection sections which spring back towards the narrow sides, whereby a head region (structural volume) of the insulating material housing (2) is formed, wherein the switching mechanism (20) and the switching shaft (30) are arranged in the head region of the insulating material housing (2).

10. Electronically switching low-voltage protective switching device (1) according to one of the preceding claims, wherein the insulating material housing (2) has a lower housing shell which comprises the entire fastening side (4) as well as sections of the narrow and wide sides (5, 6), and an upper housing shell which is mechanically connected to the lower housing shell and which comprises the entire front side (3) as well as further sections of the narrow and wide sides (5, 6).

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