DE102021208518A1 - Insulated housing and low-voltage protective switching device - Google Patents

Abstract

The insulating housing (10) according to the invention for a modular, multi-pole low-voltage protective switching device (1) has a front side (11), a fastening side (12) arranged opposite the front side (11), and the front and fastening sides (11, 12) connecting narrow and broad sides (13-1, 13-2, 14-1, 14-2). Furthermore, the insulating material housing (10) has a first functional area (20) and a second functional area (30), which are arranged next to one another with a width (B) of only one pitch unit and each extend from one narrow side to the opposite narrow side (13-1 , 13-2), each of the two functional areas (20, 30) having a narrow and a wide partial area (21, 31, 22, 32). Furthermore, the insulating material housing (10) has an insertion opening (15) which extends from one broad side (14-1, 14-2) to the other, whereby an installation space (16) is formed which, when combined with another insulating material housing (10') is provided as a cross-module installation space (16, 16') for accommodating a cross-module functional assembly. Large-volume components of the low-voltage protective switching device (1) can easily be retrofitted via the insertion opening (15) without the insulating housing (10) having to be opened for this purpose.

Description

The invention relates to an insulating material housing for a modular, multi-pole low-voltage protective switching device, having a front side, a fastening side arranged opposite the front side, and narrow and broad sides connecting the front and the fastening side, the insulating material housing being designed in a narrow design and having a first and has a second functional area, which are arranged next to one another with a width of only one pitch unit and each extend from one narrow side to the opposite narrow side, each of the two functional areas having a wide and a narrow partial area. Furthermore, the invention relates to a low-voltage protective switching device, which has at least two modules arranged next to one another, each with an insulating material housing formed according to the invention.

Electromechanical protective switching devices - for example circuit breakers, miniature circuit breakers, residual current circuit breakers and arcing or fire protection switches - are used to monitor and protect an electrical circuit and are used in particular as switching and safety elements in electrical energy supply and distribution networks. To monitor and protect the electrical circuit, the protective switching device is electrically conductively connected to an electrical line of the circuit to be monitored via two or more connection terminals in order to interrupt the electrical current in the respective monitored line if necessary. For this purpose, the protective switching device has at least one switching contact which can be opened when a predefined state occurs—for example when a short circuit or a fault current is detected—in order to separate the monitored circuit from the electrical mains. Such protective switching devices are also known as modular installation devices in the field of low-voltage technology.

Circuit breakers are specially designed for high currents. A circuit breaker (so-called circuit breaker), which is also known as a "miniature circuit breaker" (MCB), represents a so-called overcurrent protection device in electrical installations and is used in particular in the area of low-voltage networks. Circuit breakers and miniature circuit breakers guarantee safe shutdown in the event of a short circuit and protect consumers and systems from overload, for example from damage to the electrical lines due to excessive heating as a result of an excessive electrical current. They are designed to automatically switch off a circuit to be monitored in the event of a short circuit or if an overload occurs and thus to separate it from the rest of the line network. Circuit breakers and miniature circuit breakers are therefore used in particular as switching and safety elements for monitoring and protecting an electrical circuit in electrical power supply networks. Miniature circuit breakers are from the publications DE 10 2015 217 704 A1 , EP 2 980 822 A1 , DE 10 2015 213 375 A1 , DE 10 2013 211 539 A1 or EP 2 685 482 B1 known in principle.

To interrupt a single phase line, a single-pole circuit breaker is usually used, which usually has a width of one pitch unit (corresponds to approx. 18mm). For three-phase connections (as an alternative to three single-pole switching devices), three-pole miniature circuit breakers are used, which accordingly have a width of three modular widths (corresponds to approx. 54mm). A pole, i.e. a switching point, is assigned to each of the three phase conductors. If the neutral conductor is to be interrupted in addition to the three phase conductors, this is referred to as a four-pole device, which has four switching points: three for the three phase conductors and one for the shared neutral conductor.

In addition, there are compact miniature circuit breakers which, with a housing width of just one pitch unit, provide two switching contacts for one connecting cable each, i.e. either for two phase cables (compact miniature circuit breakers of type 1+1) or for a phase cable and the neutral conductor (compact miniature circuit breaker of type 1+N). . Compact protective switching devices of this type with a slim design are known, for example, from publications DE 10 2004 034 859 A1 , EP 1 191 562 B1 or EP 1 473 750 A1 known in principle.

A residual current circuit breaker is a protective device to ensure protection against a dangerous residual current in an electrical system. Such a fault current - which is also referred to as differential current - occurs when a live part of the line has an electrical contact to earth. This is the case, for example, when a person touches a live part of an electrical installation: in this case, the current flows as a fault current through the person's body towards earth. To protect against such body currents, the fault current circuit breaker must quickly and safely disconnect all poles of the electrical system from the mains when such a fault current occurs. In general usage, the terms FI circuit breaker are used instead of the term "residual current circuit breaker". (abbreviated: FI switch), residual current circuit breaker (abbreviated: DI switch) or RCD (for "Residual Current Protective Device") are used equally.

In the case of residual current circuit breakers, a distinction is also made between mains voltage-dependent and mains voltage-independent device types: while mains-voltage-dependent residual current circuit breakers have control electronics with a trigger that is dependent on an auxiliary or mains voltage to fulfill their function, mains-voltage-independent residual current circuit breakers do not need an auxiliary or mains voltage to implement the tripping function, but instead have an electronic control system To implement mains-voltage-independent tripping, they usually have a slightly larger summation current transformer, which means that a larger induction current can be generated in the secondary winding.

In addition, there are also device designs in which the functionality of a residual current circuit breaker is combined with the functionality of a miniature circuit breaker: such combined protective switching devices are referred to in German as FI/LS or in English-speaking countries as RCBO (for residual current operated circuit breaker with overcurrent protection). . Compared to separate residual current circuit breakers and miniature circuit breakers, these combination devices have the advantage that each circuit has its own residual current circuit breaker: Normally, a single residual current circuit breaker is used for several circuits. If there is a residual current, all of the protected circuits are switched off as a result. By using RCBOs, only the affected circuit is switched off.

To detect such a fault or differential current, the size of the current in a line leading to an electrical load, for example a phase line, is compared with the size of the current in a line leading back from the electrical load, for example a neutral conductor, using a so-called summation current transformer . This has a ring-shaped magnetic core through which the primary conductors (return electrical lines) are passed. The magnetic core itself is wrapped with a secondary conductor or a secondary winding. In the fault-free state, the sum of the electrical currents flowing to the consumer is equal to the sum of the electrical currents flowing back from the consumer. If the currents are added vectorially, i.e. directional or signed, it follows that the signed sum of the electrical currents in the forward and return lines in the fault-free state is equal to zero: no induction current is induced in the secondary conductor. In contrast to this, in the case of a fault or differential current that flows to earth, the sum of the electrical currents flowing in or out, which is recorded in the summation current transformer, is not equal to zero. The resulting current difference causes a voltage that is proportional to the current difference to be induced at the secondary winding, as a result of which a secondary current flows in the secondary winding. This secondary current serves as a residual current signal and, when a predetermined value is exceeded, triggers the protective switching device and as a result—by opening the at least one switching contact of the protective switching device—the correspondingly secured circuit is switched off.

Especially with multi-pole residual current circuit breakers - whether as a pure residual current circuit breaker or as a combined device design such as FI/LS or RCBO - the comparatively thick primary conductors must be threaded manually through the ring-shaped magnetic core when installing the summation current transformer. In the case of compact protective or measuring devices in particular, which only have a small installation space, such an assembly is comparatively complex and must be carried out by hand.

It is therefore the object of the present invention to provide an insulating material housing for a modular, multi-pole low-voltage protective switching device and a low-voltage protective switching device formed with such an insulating material housing, which are distinguished by simplified assembly.

This object is achieved according to the invention by the insulating housing for a modular, multi-pole low-voltage protective switching device and the low-voltage protective switching device formed by means of such an insulating housing according to the independent claims. Advantageous configurations are the subject matter of the dependent claims.

The insulating housing according to the invention for a modular, multi-pole low-voltage protective switching device has a front side, a fastening side arranged opposite the front side, and narrow and broad sides connecting the front side and the fastening side. Furthermore, the insulating material housing has a first functional area and a second functional area, which are arranged next to one another with a width of only one pitch unit and each extend from one narrow side to the opposite narrow side, each of the two functional areas having a narrow and a wide partial area. Furthermore, this indicates Insulating material housing has an insertion opening, which extends from one broad side to the other, whereby an installation space is formed, which is provided in a combination with another insulating material housing as a cross-module installation space for receiving a cross-module functional assembly.

The insulating housing according to the invention has a narrow design, i.e. it has a width of only one pitch unit, which corresponds to a width of approximately 18 mm. It is divided into a first functional area and a second functional area, which extend from one narrow side to the other, with each of the functional areas having a narrow and a wide section in which components of a low-voltage protective switching device, such as a switching contact, a switching mechanism and various Triggering devices for opening the switching contact when predefined triggering events such as short circuit or thermal overload occur, can be arranged. The wide partial areas are each arranged in the area of one of the two narrow sides. The insulating material housing is mechanically stable and essentially consists of two half-shells, each of which has one of the broad sides. The two half-shells are held together by means of suitable connecting means - for example mechanical riveting and/or snap-in connections, but also material connections such as gluing or ultrasonic welding.

The insertion opening, which is accessible via the two broad sides, is located eccentrically between the two narrow sides, i.e. in the area of one of the two narrow sides or in the area of one of the two wide partial areas. With the help of the slide-in opening, large-volume components of the low-voltage protective switching device can be installed in a simple manner without the insulating housing having to be opened for this purpose.

In an advantageous development of the insulating material housing, the wide partial area of the first functional area is arranged next to the narrow partial area of the second functional area, and the wide partial area of the second functional area is arranged next to the narrow partial area of the first functional area.

The narrow sub-area of one functional area and the wide sub-area of the other functional area complement each other to form a housing width of one pitch unit. In this way, it is also possible to arrange components of the low-voltage protective switching device that have a width of more than half a pitch unit, for example a magnetic short-circuit tripping device, in the respective functional area. This allows better use to be made of the installation space that is scarce in the case of compact switchgear.

In a further advantageous development of the insulating material housing, the first functional area serves as a current path area, which is provided and designed to accommodate a switching contact and a magnetic and a thermal tripping system for interrupting the switching contact.

All the components and assemblies required to implement an MCB functionality can thus be arranged in the first functional area. The first functional area has appropriately dimensioned accommodation spaces for all components and assemblies of a miniature circuit breaker (MCB): the switching contact with the associated switching mechanism, the magnetic and thermal tripping system, an arc quenching chamber to extinguish an arc that occurs when the energized switching contact opens, and two Connection elements for contacting the low-voltage protective switching device with the electrical phase line to be monitored (mains side and load side).

In this way, the functionality of a miniature circuit breaker can be arranged entirely in half a pitch unit, with space-saving components such as the thermal tripping system being arranged in the narrow sub-area of the first functional area, while large-volume components such as the magnetic tripping system or the arc quenching chamber are to be arranged in the wide sub-area of the first functional area are. The second functional area can, for example, be fitted with an additional switching contact for a neutral conductor or an additional phase conductor. As an alternative to this, the second functional area can also be used in other ways, i.e. for arranging components to implement additional functions.

In a further advantageous development of the insulating material housing, the second functional area is provided and designed to accommodate a further functional assembly. Since the functionality of a miniature circuit breaker can be arranged entirely in the first functional area of the insulating material housing, the second functional area—in particular its wide sub-area—is available for accommodating a cross-module functional assembly.

In a further advantageous development of the insulating material are the first and the second functional area separated by a partition. The partition wall runs from one narrow side to the other and is oriented at least in sections parallel to the two broad sides of the insulating material housing. It serves to isolate the two functional areas - in particular the live components that can be arranged therein.

In a further advantageous development of the insulating material housing, the insertion opening can be closed on both sides. The two plug-in openings can be closed to provide electrical insulation for the components in the installation space and to protect against environmental influences such as moisture and/or dust. For example, covers or flaps can be used as a closure element, which can be fastened to the insulating material housing by means of suitable fastening means—for example snap hooks or film hinges.

In a further advantageous development of the insulating material housing, the insulating material housing has an assembly opening which is arranged transversely to the insertion opening and extends from the fastening side into the installation space. Better access to the installation space can be achieved with the aid of the assembly opening, for example in order to connect the component to be arranged in the common installation space with other components arranged in the interior of the insulating material housing.

In a further advantageous development of the insulating material housing, the assembly opening can be closed. The assembly opening is also to protect against touching the components arranged behind it or to protect against environmental influences such as moisture and/or dust, with the help of a suitable closing element, for example a cover or a flap, which can be fastened to the insulating housing by means of suitable fastening means such as snap hooks or film hinges are lockable.

The modular low-voltage protective switching device according to the invention has at least two modules arranged next to one another, each with an insulating housing formed according to one of the preceding claims, with the installation spaces of the at least two modules arranged next to one another forming a common, cross-module installation space for accommodating a cross-module functional assembly.

The two insulating housings forming the low-voltage protective switching device are arranged side by side, so that the installation spaces of the two insulating housings are directly adjacent to one another and in this way form a common, cross-module installation space in which a large-volume functional assembly can be arranged.

In an advantageous development of the low-voltage protective switching device, a summation current transformer is accommodated and held in the installation space spanning the modules.

A summation current transformer, for example, through which a neutral conductor and at least one phase conductor are routed, can be considered as a large-volume functional assembly. In this way it is possible to mount the summation current transformer towards the end of the assembly sequence when the half-shells of the two insulating housings are already closed. The assembly work - which is due in particular to the threading through of the comparatively rigid primary conductors through the magnetic core of the summation current transformer - can be significantly reduced as a result. Since the primary conductors are routed through the magnetic core outside of the insulating housing, and thus before the summation current transformer is installed in the insulating housing, the installation of the low-voltage protective switching device can be carried out at least partially automatically.

In a further advantageous development of the low-voltage protective switching device, the first module is designed as an RCD module, in whose first functional area a current path for contacting a neutral conductor is arranged, and in whose second functional area RCD functional assemblies are accommodated and held. The second module is designed as an MCB module, in whose first functional area a current path for contacting a phase conductor is arranged, which has a switching contact and a switching mechanism with a magnetic and a thermal tripping system for interrupting the switching contact.

In this way, a two-pole FI/LS or RCBO can be implemented using two insulating material housings according to the invention. In this case, the first insulating material housing is part of an RCD module, the first functional area of which serves as a current path area for a neutral conductor. The second insulating housing, on the other hand, is part of an MCB module whose first functional area serves as a current path area for a phase conductor. The neutral conductor and phase conductor are accommodated and held in the respective module, including the assemblies and components required to implement the respective module functionality. For assembly, the cross-module functional assembly - here the summation current transformer - pushed into the installation space covering all modules and contacted with connection elements of the current path areas of the neutral conductor and the phase conductor arranged in the two modules.

The insulating material housing according to the invention can be used both to implement an RCD module and an MCB module, as a result of which the number of variants and the manufacturing costs can be significantly reduced.

In a further advantageous development, the low-voltage protective switching device has at least one additional module designed as an MCB module. By adding further MCB modules, three-pole or four-pole FI/LS or RCBO devices can be easily implemented. Only the summation current transformer to be inserted in the common, cross-module installation space has to be modified accordingly.

• 1 und 2 schematische Darstellungen des erfindungsgemäßen Isolierstoffgehäuses in verschiedenen Ansichten;
• 3 eine schematische Darstellung des modularen Aufbaus des erfindungsgemäßen Niederspannungs-Schutzschaltgerätes in einer Draufsicht;
• 4 eine schematische Darstellung einer Unteransicht des erfindungsgemäßen Niederspannungs-Schutzschaltgerätes;

An exemplary embodiment of the insulating material housing according to the invention and of the low-voltage protective switching device according to the invention is explained in more detail below with reference to the attached figures. In the figures are:

• 1 and 2 schematic representations of the insulating housing according to the invention in different views;
• 3 a schematic representation of the modular structure of the low-voltage protective switching device according to the invention in a plan view;
• 4 a schematic representation of a bottom view of the low-voltage protective switching device according to the invention;

In the various figures of the drawing, the same parts are always provided with the same reference numbers. The description applies to all drawing figures in which the corresponding part can also be seen.

In the 1 and 2 is the insulating housing 10 according to the invention for a modular, multi-pole low-voltage protective switching device 1 (see 3 and 4 ) shown schematically in different views. 1 shows a side view of the insulating material housing 10. In 2 the basic structure of the insulating material housing 10 is shown schematically.

The insulating material housing 10 is designed in a narrow design and has a width B of one pitch unit (1HP, corresponding to approx the fastening side 11, 12 connecting narrow sides 13-1, 13-2 and broad sides 14-1, 14-2 are formed. Inside, the insulating material housing 10 is divided by a partition 17 running from one narrow side to the other into a first functional area 20 and a second functional area 30, which are arranged next to one another and each extend from one narrow side 13-1, 13-2 to the other .

As a rule, insulating material housings 10 in a narrow design have two half-shells, which are joined together at the end of the assembly of the low-voltage protective switching device 1 by means of suitable connecting means, for example rivets or snap-in connections, forming a circumferential joining line. At least one broad side and parts (entirely or completely) of the front, fastening and narrow sides belong to each half-shell. The parting plane between the two half-shells is oriented approximately parallel to the broad sides and is formed at least in sections by the partition 17 . The dividing wall 17 does not run parallel throughout, but at least in sections at an angle to the broad sides 14-1, 14-2, whereby a narrow and a wide partial area of the respective functional area are formed: The first functional area 20 thus has a narrow partial area 21 and an adjoining broad portion 22; the second functional area 30 correspondingly has a narrow partial area 31 and an adjoining wide partial area 32. The narrow partial area 21 of the first functional area 20 is arranged in the width direction next to the wide partial area 32 of the second functional area 30, which is the wide partial area 22 of the first functional area 20 accordingly arranged next to the narrow partial area 31 of the second functional area 30 in the width direction.

According to the invention, an insertion opening 15 is formed in the broad sides 14-1, 14-2 of the insulating housing 10, which extends orthogonally to the broad sides 14-1, 14-2 from one broad side 14-1 to the other broad side 14-2, whereby a Installation space 16 is formed. The installation space 16 is eccentric, i.e. shifted towards the narrow side 13-1, placed in the insulating housing 10 and accessible via each of the two broad sides 14-1, 14-2.

To form a modular, multi-pole low-voltage protective switching device, a further insulating material housing 10' is arranged broadside to broadside next to the first insulating material housing 10. In this way, the two adjacent installation spaces 16 and 16' form a module-spanning installation space 16, 16' (see 3 ), which is used to hold a modul cross-function assembly - for example, a cross-module electronics assembly, measuring or communication device, or a summation current transformer - can be used. This is advantageous in particular in the case of assemblies or components with a comparatively high space requirement, since there is not sufficient space available for this in an insulating material housing with a narrow design.

3 shows a schematic representation of the modular structure of a low-voltage protective switching device 1 according to the invention in a plan view. In the representation of 2 it is a four-pole protective switching device, which is accordingly formed from four modules 2, 3, 3' arranged next to one another, ie broadside to broadside. Each of the modules 2, 3, 3' has an insulating material housing 10, 10' of the type described above.

A first module 2 (shown hatched on the right) is designed as an RCD module. The first functional area 20 of the RCD module 2 serves as a current path area, in which a current path for contacting a neutral conductor and RCD functional assemblies, for example the trigger mechanism for triggering the switching device when a fault current occurs, are accommodated and held.

A second module 3 and two further second modules 3' are all designed as MCB modules. The first functional area 20' of the MCB modules 3, 3' in turn serves as a current path area in which a current path for contacting a phase conductor is arranged, i.e. accommodated and held. The MCB functional assemblies assigned to the current path of the MCB module 3, 3' - a switching contact and a switching mechanism including a magnetic and a thermal tripping system for interrupting the switching contact (not shown) - are also accommodated and held in the first functional area 20'.

Due to the arrangement of the four insulating housings 10, 10' broadside to broadside, the installation spaces 16, 16' are also arranged next to one another, as a result of which the installation space 16, 16' covering all modules is formed for accommodating a functional assembly covering all modules, here a summation current transformer (not shown). To detect a residual current, the neutral conductor current path arranged in the RCD module 2 and the phase conductor current paths arranged in the MCB modules 3, 3' are passed through the magnetic core of the summation current transformer. The installation space required for the cross-module installation space 16, 16' is provided by the parts of the insulating housing 10, 10' that are not yet used, i.e. not yet occupied by components: the narrow partial areas 21, 21' of the first functional areas 20, 20' as well as the wide partial areas 32, 32' of the second functional areas 30, 30' of the modules 2, 3, 3' involved. If required, further functional assemblies, for example measuring or communication assemblies, can be accommodated and held in the narrow partial areas 31, 31' of the second functional areas 30, 30'.

If the summation current transformer is pushed in and installed in the cross-module installation space, the two outer push-in openings 15, i.e. the left-hand push-in opening 15 of the module 3' arranged on the left outside and the right-hand push-in opening 15 of the module 2 arranged on the outside right, can be closed by means of a suitable closing element, for example a cover , to be closed.

In 4 12 is a bottom view (viewing the attachment side 12) of the FIG 2 known low-voltage protective switching device 1 shown schematically. It is clear that each of the insulating material housings 10, 10' has an assembly opening 18 in the area below the installation space 16, 16' assigned to the respective insulating material housing 10, 10', which extends from the fastening side 12 of the respective insulating material housing 10, 10' to the this associated installation space 16, 16 'extends. The mounting openings 18 ensure better access to the installation space 16, 16' in order to electrically conductively connect the summation current transformer arranged therein to the corresponding contact elements of the respective module 2, 3, 3', for example using a suitable soldering process. To protect against touching the components arranged behind it or to protect against environmental influences such as moisture and/or dust, the assembly openings 18 can also be closed with the aid of suitable sealing elements after the summation current transformer has been assembled.

Through the in the 3 and 4 The functionality of a four-pole RCBO or FI/LS is implemented in the low-voltage protective switching device 1 shown schematically, with the low-voltage protective switching device 1 according to the invention consisting of structurally stable, closed modules 2, 3, 3'. The strength of the low-voltage protective switching device 1 and the tight fit of the same in the electrical installation distributor is achieved by the mechanically stable construction of the individual modules 2, 3, 3'. Each of the modules 2, 3, 3' has an installation space 16, 16', which form a common, cross-module installation space 16, 16' through the assembly of the modules 2, 3, 3'. which is equipped with a cross-module assembly - in the case of an RCBO or FI/LS with a summation current transformer.

Instead of a four-pole RCBO or FI/LS, two- or three-pole versions can also be implemented by omitting one or two MCB modules accordingly. This significantly reduces the number of housing variants.

The modular design of the low-voltage protective switching device 1 also has the advantage of modular assembly and testing, i.e. each individual module 2, 3, 3' can be assembled and tested separately before being combined with other modules 2, 3, 3', which troubleshooting in production is made significantly easier, since only positively tested modules 2, 3, 3' are combined to form a modular low-voltage protective switching device 1. The detection of errors does not only take place in a highly refined assembly state, but is brought forward to an early phase of production. This also makes it possible to examine functions separately, for example switching on and off, magnetic, thermal and residual current-related tripping, tripping indication, etc.

Reference List

1

Low voltage circuit breaker

2

first module

3

second module

3'

another second module

10

insulating housing

10'

another insulating housing

11

front

12

mounting side

13-1

narrow side

13-2

narrow side

14-1

broadside

14-2

broadside

15

insertion opening

16

installation space

16'

further installation space

17

partition wall

18

mounting hole

20

first functional area

20'

first functional area

21

narrow section

22

wide section

30

second functional area

30'

second functional area

31

narrow section

32

wide section

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102015217704 A1 [0003]
• EP 2980822 A1 [0003]
• DE 102015213375 A1 [0003]
• DE 102013211539 A1 [0003]
• EP 2685482 B1 [0003]
• DE 102004034859 A1 [0005]
• EP 1191562 B1 [0005]
• EP 1473750 A1 [0005]

Claims (12)

Insulating housing (10) for a modular, multi-pole low-voltage protective switching device (1), having a front side (11), a fastening side (12) arranged opposite the front side (11), and connecting the front and fastening sides (11, 12). Narrow and broad sides (13-1, 13-2, 14-1, 14-2), - with a first functional area (20) and a second functional area (30) which, with a width (B) of only one pitch unit ( TE) are arranged side by side and each extend from one narrow side (13-1, 13-2) opposite to the other, - each of the two functional areas (20, 30) having a narrow and a wide partial area (21, 31, 22, 32), characterized in that the insulating housing (10) has an insertion opening (15) which extends from one broad side to the other (14-1, 14-2), whereby an installation space (16) is formed, which at a combination with another insulating material housing (10') is provided as a cross-module installation space (16, 16') for receiving a cross-module functional assembly. Insulating housing (10) according to claim 1 , characterized in that the wide partial area (22) of the first functional area (20) next to the narrow partial area (31) of the second functional area (30) and the wide partial area (32) of the second functional area (30) next to the narrow partial area (21) of the first functional area (20) are arranged. Insulating material housing (10) according to one of the preceding claims, characterized in that the first functional area (20) serves as a current path area which is provided and designed to accommodate a switching contact and a magnetic and a thermal tripping system for interrupting the switching contact. Insulating housing (10) according to one of the preceding claims, characterized in that the second functional area (30) is provided and designed to accommodate a further functional assembly. Insulating housing (10) according to one of the preceding claims, characterized in that the first and the second functional area (20, 30) are separated from one another by a partition (17). Insulating material housing (10) according to one of the preceding claims, characterized in that the insertion opening (15) can be closed on both sides. Insulating material housing (10) according to one of the preceding claims, characterized in that the insulating material housing (10) has an assembly opening (18) which is arranged transversely to the insertion opening (15) and extends from the fastening side (12) into the installation space (16). extends. Insulating housing (10) according to claim 7 , characterized in that the assembly opening (18) can be closed. Modular low-voltage protective switching device (1), having at least two modules (2, 3, 3') arranged next to one another, each with an insulating material housing (10, 10') formed according to one of the preceding claims, with the installation spaces (16, 16') the at least two modules (2, 3, 3') arranged next to one another form a common, cross-module installation space (16, 16') for accommodating a cross-module functional assembly. Low-voltage protective switching device (1) according to claim 9 , characterized in that in the cross-module installation space (16, 16') a summation current transformer is accommodated and held. Low-voltage protective switching device (1) according to one of claims 9 or 10 , characterized in that - that the first module (2) is designed as an RCD module, in the first functional area (20) of which a current path for contacting a neutral conductor and RCD functional assemblies are accommodated and held, - that the second module (3, 3') is designed as an MCB module, in whose first functional area (20') a current path for contacting a phase conductor is arranged, which has a switching contact and a switching mechanism with a magnetic and a thermal tripping system for interrupting the switching contact. Low-voltage protection switching device after claim 11 , characterized in that the protective switching device has at least one further module (3') designed as an MCB module.

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