SWITCH CABINET

Abstract

Control cabinet (11, 31, 41) in which a circuit breaker (2, 2a, 2b) with connection terminals (2t) for connecting to main circuit conductors (3, 3a, 3b) is accommodated, comprising: a heat shield partition (23, 23a, 23b) provided to shield the circuit breaker (2, 2a, 2b) from heat in relation to another accommodated device (4); cooling elements (50) provided in a connection section (50c) between the connection terminals (2t) and the main circuit conductors (3, 3a, 3b), each consisting of a laminated body, wherein a plurality of printed circuit boards are laminated together such that their surfaces are arranged parallel to the direction in which a cooling air (20, 20a, 20b) flows, and also that voids (50g) are formed between them;an independent inlet (21, 21a, 21b) which is distinct from an inlet (6) of the other incorporated device (4) and is provided for receiving air (20, 20a, 20b) with which a connecting section (3c) is to be cooled; and a ventilation duct (22, 22a, 22b) through which the air (20, 20a, 20b) is to be directed to the connecting section (3c), wherein at least a section of the circuit breaker (2) projects forward from the front (1F) of the switch cabinet (41), and the inlet (24) is provided on the bottom side of the projecting circuit breaker (2), the bottom side facing the bottom of the switch cabinet (11, 31, 41).

Description

Technical field

[0001] The present application relates to the area of ​​a switch cabinet or switchboard with a circuit breaker included therein. Technological background

[0002] By energizing the main circuit conductors, an increase in temperature within a control cabinet, resulting from heat generated by a device housed within the cabinet, a main circuit device, and the main circuit conductors, affects the operation of the device, particularly a circuit breaker. The circuit breaker has a standardized operating temperature setting and must operate within that range. Therefore, it is necessary to efficiently cool the device housed within the control cabinet to prevent a temperature increase and thus avoid adversely affecting the circuit breaker's operation.

[0003] As a method for efficiently cooling the interior of a device, a system operating device and control cabinet of PTL 1, for example, includes a ventilation fan installed in a ceiling section of the cabinet or panel, a heat shield duct located within the surface of a wall of the cabinet, and an inlet opening section located in a lower section of the wall of the cabinet. The heat shield duct rises from bottom to top, either along the entire surface or a portion thereof, and is curved in the ceiling section towards the ventilation fan. Thus, a heat shield structure installation within the device is combined with a simple duct structure that generates an airflow, thereby efficiently cooling the heat-generating components by operating the airflow. List of citations from patent literature

[0004] PTL 1: JP-A-2017-229173 Summary of the invention: Technical problem

[0005] However, in the control cabinet containing the circuit breaker, the previously known method according to the previously known PTL 1 presents a problem: when cooling air is drawn in from outside the control cabinet, particularly from the lower section, heat is generated by the device inside the cabinet and by the main circuit conductors. This heated air then passes through the circuit breaker, causing the breaker itself to generate heat and thus increasing its temperature. Therefore, efficient cooling measures are required to prevent this temperature increase in the circuit breaker.

[0006] The present application was filed to solve the above-mentioned problem, and one objective of the present application is to provide a control cabinet which, by preventing a temperature increase of a circuit breaker contained or housed in the control cabinet, can improve the cooling efficiency of the circuit breaker without being affected by the heat generated by another contained device. Solution to the problem

[0007] To solve the aforementioned problem, the switchgear disclosed in the present application, which is a switchgear in which a circuit breaker with connection terminals for connecting to main circuit conductors is housed, is characterized in that it comprises a heat shield partition provided to shield the circuit breaker from heat relative to another enclosed device; an independent inlet, distinct from an inlet of the other enclosed device, to receive air for cooling a connection section between the connection terminals and the main circuit conductors; and a ventilation duct through which the air is to be supplied to the connection section. Advantageous effects of the invention

[0008] According to the control cabinet disclosed in the present application, the circuit breaker is thermally shielded from the other device included in the cabinet to allow the circuit breaker to be efficiently cooled, and the independent inlet is provided to draw in air from outside, thereby applying cooling air directly to the connection section between the circuit breaker and the main circuit conductors, thus producing the advantageous effect of efficiently removing or dissipating the heat generated in the circuit breaker. List of characters [ Fig. 1] Fig. Figure 1 shows a sectional view of an outline configuration of a control cabinet which contains an open circuit breaker or air circuit breaker according to a previously known example. [ Fig. 2] Fig. Figure 2 shows a perspective view of the appearance of a control cabinet which contains an air circuit breaker according to the first embodiment. [ Fig. 3] Fig. Figure 3 shows a sectional view of the outline configuration of the control cabinet which houses the air circuit breaker according to the first embodiment. [ Fig. 4] Fig. Figure 4 shows an enlarged perspective view of the air power switch section, which shows the flow of cooling air in the first embodiment. [ Fig. 5] Fig. Figure 5 shows a perspective view of the appearance of a control cabinet which contains air circuit breakers according to the second embodiment. [ Fig. 6] Fig. Figure 6 shows a sectional view illustrating the outline configuration of the control cabinet which houses the air circuit breakers according to the second embodiment. [ Fig. 7] Fig. Figure 7 shows a perspective view of the appearance of a control cabinet which contains an air circuit breaker according to the third embodiment. [ Fig. 8] Fig. Figure 8 shows a sectional view showing the outline configuration of the control cabinet which houses the air circuit breaker according to the third embodiment. [ Fig. 9] Fig. Figure 9 shows an enlarged perspective view of the air power switch section, showing the flow of cooling air in the third embodiment. [ Fig. 10] Fig. Figure 10 shows a perspective view of the details of the structure of cooling elements that are mounted or attached between an air circuit breaker and main circuit conductors in the fourth embodiment. [ Fig. 11] Fig. 11 shows a side view of the Fig. 10. Description of the embodiments First embodiment

[0009] Fig. Figure 1 shows a sectional view of the outline configuration of a switchboard or control cabinet which incorporates an open circuit breaker or air circuit breaker according to a previously known example. Fig. Figure 2 shows a perspective view of the appearance of a control cabinet which contains an air circuit breaker according to the first embodiment. Fig. Figure 3 shows a sectional view showing the outline configuration of the control cabinet which houses the air circuit breaker according to the first embodiment. Fig. Figure 4 shows a partially enlarged perspective view that includes the air power switch and shows the flow of cooling air in the first embodiment.

[0010] First, using Fig. 1. A description of the outline configuration of the switchgear cabinet is given, which houses the circuit breaker according to the previously known example. A switchgear cabinet 1 according to the previously known example is provided with a three-phase AC air circuit breaker 2, which is installed in a cabinet middle layer area 1M, main circuit conductors 3 which are connected to the air circuit breaker 2, another enclosed device 4 which is installed in a cabinet lower layer area 1D, an inlet 6 which is provided in the lower section of the cabinet lower layer area 1D to receive air 5 with which a connection section 3c between connection terminals 2t of the air circuit breaker 2 and the main circuit conductors 3 is to be cooled, and outlets 9a, 9b which, provided on the top of a panel or cabinet upper layer area 1U, respectively, are provided in respective outlet towers to discharge the air 5 to the outside.An operating panel 2p is also attached to the front of the air power switch 2. Another device shown here, which differs from the one mentioned above, is omitted.

[0011] To efficiently cool the air circuit breaker 2, whose main body is housed in an enclosure, it is necessary to cool the connecting section 3c, which is connected to the main circuit conductors 3 through which the air circuit breaker 2 is energized. Therefore, in this example of a switchgear cabinet, a portion 5a of the air 5 drawn in from the inlet 6 first cools the other enclosed device 4, then passes through a vent 7h provided in a lower partition 7 of the cabinet's middle section 1M, in which the air circuit breaker 2 is installed, cools the connecting section 3c between the connection terminals 2t of the air circuit breaker 2 and the main circuit conductors 3, passes through a vent 8h provided in an upper partition 8, and is discharged from the outlet 9a of the outlet tower.A portion 5b of the air 5 is also discharged to the outside from the outlet 9b of the outlet tower via a duct section 1B in the rear of the cabinet. However, the switch cabinet 1 known so far consists of a structure where the intake air 5, after cooling the other intake device 4, cools the connection section 3c between the connection terminals 2t of the air circuit breaker 2 and the main circuit conductors 3. Therefore, a problem arises in that insufficient cooling is achieved for the air circuit breaker 2 due to heat generation from the other intake device 4, which is generated by an energy-generating device, and due to heat generation from the air circuit breaker 2 itself.

[0012] Next, a description will be given using the Fig. 2 to Fig. 4 of the configuration of the control cabinet, which incorporates the air circuit breaker according to the first embodiment of the present application. As in the Fig. 2 and Fig. Figure 3 shows a switch cabinet 11 of the first embodiment consisting of the three-phase AC air circuit breaker 2, which is arranged in the cabinet middle layer area 1M, the other device 4, which is arranged in the cabinet lower layer area 1D, an inlet 21 through which air 20 is taken in, with which the connection section 3c between the connection terminals 2t of the air circuit breaker 2 and the main circuit conductors 3 (3a, 3b) in the cabinet middle layer area 1M is to be cooled, a ventilation duct 22, which leads the cooling air 20, which is taken in by the inlet 21, to the connection section 3c between the connection terminals 2t of the air circuit breaker 2 and the main circuit conductors 3, and the inlet 6, through which the air 5 is to be taken in, with which the device 4 is to be cooled in the cabinet lower layer area 1D.

[0013] No vent is provided in the heat shield partition 23, which separates the other enclosed device 4 and the air circuit breaker 2, and the cabinet middle layer area 1M and the cabinet lower layer area 1D are thermally separated from each other. Unlike the inlet 6, through which the air 5 is to be drawn in to cool the other enclosed device 4, the inlet 21, through which the air 20 is to be drawn in to cool the air circuit breaker 2, is also provided independently. The other enclosed device 4 is cooled by the air 5 drawn in by the inlet 6, which is provided in the cabinet lower layer area 1D. The other component elements and operating modes are the same as in Fig. 1 and are therefore omitted from a description.

[0014] Fig. Figure 3 shows a sectional view illustrating the outline configuration of the control cabinet according to the first embodiment, illustrating the flow of air 20 used to cool the air circuit breaker 2, which is a device housed within the control cabinet. The air 20, drawn in through the inlet 21, is directed to the ventilation duct 22. After cooling the connection section 3c between the connection terminals 2t of the air circuit breaker 2 and the main circuit conductors 3, it flows into the upper cabinet compartment 1U from the vent 8h provided in the upper partition 8 and is discharged outside the cabinet through the outlet 9a of the exhaust tower. Accordingly, heat generated by the energized air circuit breaker 2 can be dissipated by the cooling air 20 cooling the connection section 3c between the connection terminals 2t of the air circuit breaker 2 and the main circuit conductors 3.

[0015] The air 5, which was drawn in through inlet 6 and cooled the other device 4 in the cabinet's lower layer area 1D, and which passed through duct section 1B in the rear of the cabinet from a vent 10h of partition 10, is expelled outwards from the cabinet through outlet 9b into the other outlet tower. No vent is provided in the heat shield partition 23 below the air circuit breaker 2, and the cabinet's middle layer area 1M and lower layer area 1D are thermally shielded from each other. Therefore, after dissipating the heat generated in the other device 4 in the lower layer area 1D, the cooling air 5 is discharged from the cabinet in the middle layer area 1M without any contact with the air circuit breaker 2.

[0016] A (not shown) shock blower is also provided in the front part of the inlet 21, so that the flow volume of the air 20 is increased, with which the connection section 3c between the connection terminals 2t of the air circuit breaker 2 and the main circuit conductors 3 is to be cooled, thereby enabling an increase in the cooling capacity of the air circuit breaker 2.

[0017] As in Fig. As shown in Figure 4, a grill 21m could also be provided in the front part of the inlet 21, which would prevent the ingress of foreign substances or insects from outside. Alternatively, a distribution network could be used instead of the grill 21m.

[0018] Thus, according to the control cabinet of the first embodiment, the air taken in by the independent inlet is applied directly to the connecting section between the connection terminals of the air circuit breaker and the main circuit conductors, thereby achieving the advantageous effect that it is possible to efficiently dissipate the heat generated by the energized air circuit breaker without being affected by the heat generated in the other device taken in. Second embodiment

[0019] Fig. Figure 5 shows a perspective view of the appearance of a control cabinet containing air circuit breakers according to the second embodiment. Fig. Figure 6 shows a sectional view illustrating the outline configuration of the control cabinet according to the second embodiment, which houses the air circuit breakers. The second embodiment shows a configuration in which a plurality of air circuit breakers are housed in layers, with each of the plurality of air circuit breakers having an independent inlet and a ventilation duct.

[0020] Next, with reference to the Fig. 5 and Fig. 6 the configuration of the control cabinet according to the second embodiment is described, which has the air circuit breakers included therein.

[0021] As in the Fig. 5 and Fig. Figure 6 shows a switch cabinet 31 of the second embodiment comprising a three-phase AC air circuit breaker 2a, which is arranged in the middle cabinet layer area 1M, a three-phase AC air circuit breaker 2b, which is arranged in the upper cabinet layer area 1U, the other device 4, which is accommodated in a lower cabinet layer area 1D, an inlet 21a through which air 20a is drawn in to cool a connection section 3c between connection terminals 2t of the air circuit breaker 2a and main circuit conductors 3 (3a, 3b), a ventilation duct 22a, which is provided in a section directly below the air circuit breaker 2a and directs the cooling air 20a, drawn in by the inlet 21a, to the connection section 3c between the connection terminals 2t of the air circuit breaker 2a and the main circuit conductors 3 (3a, 3b), and a Inlet 21b, through which air 20b is taken in,with which a connecting section 3c between connecting terminals 2t of the air circuit breaker 2b and main circuit conductors 3 (3a, 3b) is to be cooled, from a ventilation duct 22b, which is provided in a section directly below the air circuit breaker 2b and which leads the cooling air 20b, which is taken in by the inlet 21b, to the connecting section 3c between the connecting terminals 2t of the air circuit breaker 2b and the main circuit conductors 3 (3a, 3b), and is provided from an inlet 6, through which the air 5, with which the other received device 4 is to be cooled, is taken into the cabinet lower layer area 1D.

[0022] No vent is provided in a heat shield partition 23a that separates the other enclosed device 4 and the air circuit breaker 2a, and the cabinet middle layer area 1M and the cabinet lower layer area 1D are thermally shielded from each other. The cabinet upper layer area 1U and the cabinet middle layer area 1M are also thermally shielded by a heat shield partition 23b. Furthermore, unlike the inlet 6 through which the air 5 is drawn in to cool the other enclosed device 4, the inlets 21a and 21b, through which the respective air 20a and 20b are drawn in to cool the respective air circuit breakers 2a and 2b, are provided independently. The other enclosed device 4 is cooled by the air 5 drawn in through the inlet 6, which is provided in the cabinet lower layer area 1D.The other component elements and operating modes are the same as in the first embodiment and are therefore omitted from a description.

[0023] Fig. Figure 6 shows a sectional view illustrating the outline configuration of the control cabinet according to the second embodiment, illustrating the airflows 20a, 20b used to cool the respective air circuit breakers 2a, 2b, which are devices housed in the control cabinet. The air 20a, drawn in by the inlet 21a of the air circuit breaker 2a, is directed to the ventilation duct 22a after the connecting section 3c between the connecting terminals 2t of the air circuit breaker 2a and the main circuit conductors 3 (3a, 3b) has been cooled. It then passes through the vent 2h of partition 10 and is discharged outside the cabinet from the outlet 9b of the outlet tower through the duct section 1B at the rear of the cabinet.Accordingly, the heat generated by the air circuit breaker 2a, which is energized, can be dissipated by the cooling air 20a, which cools the connecting section 3c between the connecting terminals 2t of the air circuit breaker 2a and the main circuit conductors 3 (3a, 3b).

[0024] The air 20b, drawn in through the inlet 21b of the air circuit breaker 2b, is directed to the ventilation duct 22b. After cooling the connection section 3c between the connection terminals 2t of the air circuit breaker 2b and the main circuit conductors 3 (3a, 3b), it flows to the cabinet upper section 1U and is discharged outside the cabinet through outlet 9a in the exhaust tower. A portion of the air 20b flows to duct section 1B in the rear of the cabinet through the vent 2h of partition 10 and is also discharged outside the cabinet through outlet 9b of the exhaust tower. Accordingly, the heat generated by the air circuit breaker 2b, which is energized, can be dissipated by the cooling air 20b, which cools the connecting section 3c between the connecting terminals 2t of the air circuit breaker 2b and the main circuit conductors 3 (3a, 3b).

[0025] The air 5, which is drawn in through inlet 6 and cools the other device 4 in the cabinet lower layer area 1D, also passes through duct section 1B in the rear of the cabinet from vent 10h of partition 10 and is discharged outside the cabinet through outlet 9 of the outlet tower. No vent is provided in the heat shield partition 23a below the air circuit breaker 2a, and the cabinet middle layer area 1M and the cabinet lower layer area 1D are thermally shielded from each other by the heat shield partition 23b. The cooling air 5, after cooling the heat generated in the other device 4 in the cabinet lower layer area 1D, is discharged outside the cabinet without any contact with the air circuit breakers 2a and 2b located in the cabinet middle layer area 1M and the cabinet lower layer area 1D, respectively.

[0026] Thus, according to the control cabinet of the second embodiment, even if the plurality of air circuit breakers are housed in layers, the air drawn in from each of the independent inlets is directed to the connecting section between the connection terminals of the air circuit breaker and the main circuit conductors, thereby producing the advantageous effect that it is possible to efficiently dissipate the heat generated by each of the energized air circuit breakers without being affected by the heat generated in the other air circuit breaker and the housed device. Third embodiment

[0027] Fig. Figure 7 shows a perspective view of the appearance of a control cabinet according to the third embodiment, which has incorporated an air circuit breaker. Fig. Figure 8 shows a sectional view showing the outline configuration of the control cabinet according to the third embodiment, which incorporates the air circuit breaker. Fig. Figure 9 shows a partially enlarged perspective view including the air circuit breaker, which shows the flow of cooling air in the third embodiment. The third embodiment shows a configuration in which an inlet for cooling air circuit breaker is provided below the air circuit breaker.

[0028] Next, with reference to the Fig. 7, Fig. 8 and Fig. 9 the configuration of the control cabinet which houses the air circuit breaker is described according to the third embodiment.

[0029] As in the Fig. 7, Fig. 8 and Fig. As shown in Figure 9, in a control cabinet 41 of the third embodiment, the three-phase AC air circuit breaker 2, which is arranged in the middle layer area 1M of the cabinet, is arranged to project forward from a front surface 1F of the lower layer area 1D of the cabinet, and an inlet 24, through which the air 20 is taken in, is provided on the bottom side of the air circuit breaker 2.

[0030] The switch cabinet 41 is comprised of the three-phase AC air circuit breaker 2, which is arranged in the cabinet middle layer area 1M, the other device 4, which is arranged in the cabinet lower layer area 1D, the inlet 24, through which the air 20 is drawn in to cool the connection section 3c between the connection terminals 2t of the air circuit breaker 2 and the main circuit conductors 3 (3a, 3b), the ventilation duct 22, which, provided directly below the air circuit breaker 2, directs the cooling air 20 drawn in by the inlet 24 to the connection section 3c between the connection terminals 2t of the air circuit breaker 2 and the main circuit conductors 3 (3a, 3b), and the inlet 6, through which the air 5 is drawn into the cabinet lower layer area 1D to cool the other device 4.The control cabinet 41 is also the same as in the first embodiment in that no vent is provided in the heat shield partition 23, which separates the other enclosed device 4 and the air circuit breaker 2, and in that the air circuit breaker 2 is thermally shielded from the other enclosed device 4. The difference compared to the first embodiment is that the air circuit breaker 2 projects forward from the front surface 1F of the cabinet's lower layer area 1D, and that the inlet 24 is located on the bottom side of the air circuit breaker 2. The bottom-side inlet 24 prevents the ingress of foreign substances and water.

[0031] The other component elements and operating modes are the same as in the first embodiment and are therefore omitted from a description.

[0032] Thus, according to the control cabinet of the third embodiment, in addition to the advantageous effect of the first embodiment, the inlet through which the cooling air is drawn in is positioned on the bottom side of the air circuit breaker, thereby achieving the advantageous effect of preventing the ingress of foreign substances and water. Fourth embodiment

[0033] Fig. Figure 10 shows a perspective view of the details of the structure of a connecting section between connecting terminals of an air circuit breaker and main circuit conductors in the fourth embodiment. Fig. 11 shows a side view of the Fig. 10. The fourth embodiment is such that cooling elements, with which the air circuit breaker is to be cooled, are mounted between the connection terminals of the air circuit breaker and the main circuit conductors.

[0034] As in the Fig. 10 and Fig. As shown in Figure 11, cooling elements 50 are arranged in a control cabinet of the fourth embodiment, each consisting of a plurality of printed circuit boards. The printed circuit boards are arranged such that their surfaces are parallel to the direction in which the cooling air 20 flows, and spaces are provided between them to form voids 50g through which the air 20 passes. One end of each of the cooling elements 50 is installed engaging in the connection terminal 2t of the air circuit breaker 2, which has a void-forming structure, and is connected to it by fastening elements 51. The other end of each of the cooling elements 50 is also bent into an L-shape, the plurality of printed circuit boards being assembled in an integrated manner, and is connected to the main circuit conductor 3 by the fastening elements 51.

[0035] The Fig. 10 and Fig.Figure 11 shows an example of mounting the cooling elements only at the connection points with the phase of a large quantity of heat generation, however the cooling elements could be mounted at all phases as required.

[0036] The connecting section of the cooling element, which is to be connected to the connecting terminal of the air circuit breaker, and its connecting section, which is to be connected to the main circuit conductor, need only be of a configuration that responds to the shape of a counterpart that is to be connected to the cooling element, and could be of a configuration with a shape that differs from that shown in the drawings, and it is only necessary that voids through which air flows are formed between the circuit boards that configure the cooling elements.

[0037] Thus, according to the control cabinet of the fourth embodiment, together with the advantageous effect in the first embodiment, the cooling elements, in which the empty spaces are formed, are attached to the connection sections between the connection terminals of the air circuit breaker and the main circuit conductors, thereby achieving the advantageous effect of being able to dissipate the heat generated in the air circuit breaker more efficiently.

[0038] In the embodiments mentioned above, the method of cooling the air circuit breaker was described, for example, by assuming the case where main circuit conductors housed in a low-voltage switchgear are applied to a three-phase AC air circuit breaker. However, the method can also be applied to other types of circuit breakers, such as a cast-case circuit breaker, and even to a housed device, and is not limited to air circuit breakers. The method could also be applied to a single-phase AC air circuit breaker and is even applicable in a high-voltage switchgear.A description was given of the case where the air circuit breaker is installed in the middle shelf area of ​​the cabinet; however, the air circuit breaker, which does not always have to be located in the middle shelf area of ​​the cabinet, could be located in another shelf area of ​​the cabinet.

[0039] Although the present application has been described above with regard to various exemplary embodiments and implementations, it is understood that the various features, aspects and functionality described in relation to one or more of the individual embodiments are not limited in their applicability to the particular embodiment in which they were described, but can instead be applied alone or in various combinations to one or more of the embodiments.

[0040] Therefore, it is understood that numerous modifications, not shown by way of example, can be devised without deviating from the scope of the present application. For example, at least one of the component parts could be modified, added, or eliminated. At least one of the component parts mentioned in at least one of the preferred embodiments could be selected and combined with the component parts mentioned in another preferred embodiment.

[0041] The same reference symbols in the drawings also indicate identical or equivalent sections or parts. Reference symbol list

[0042] 1, 11, 31, 41 Control cabinet, 2, 2a, 2b Air circuit breaker, 2t Connection terminal, 3, 3a, 3b Main circuit conductor, 3c Connection section, 20, 20a, 20b Air, 21, 21a, 21b, 24 Inlet, 21m Grill, 22, 22a, 22b Ventilation duct, 23, 23a, 23b Heat shield partition, 50 Cooling element, 50g Empty space, 51 Mounting element QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2017229173 A

[0004]

Claims

[1] Control cabinet containing a circuit breaker with connection terminals for connecting to main circuit conductors, comprising: a heat shield partition designed to shield the circuit breaker from heat transmitted to another mounted device; an independent inlet, distinct from an inlet of the other incorporated device, for receiving air to cool a connecting section between the connecting terminals and the main circuit conductors; and a ventilation duct through which the air is to be directed to the connecting section. [2] Control cabinet according to claim 1, characterized by , that The ventilation duct is provided below the circuit breaker. [3] Control cabinet according to claim 1 or 2, characterized by , that a blower with an inlet. [4] Control cabinet according to one of claims 1 to 3, characterized by , that A large number of the circuit breakers are installed in layers, and an independent inlet and ventilation duct are provided for each of the large number of circuit breakers. [5] Control cabinet according to one of claims 1 to 3, characterized by , that at least one section of the circuit breaker projects forward from the front of the switch cabinet, and the inlet is provided on the bottom side of the projecting circuit breaker. [6] Control cabinet according to any one of claims 1 to 5, characterized by , that Cooling elements are provided, each consisting of a multitude of printed circuit boards laminated together, with voids between them through which air flows, and which are attached between the connecting terminals and the main circuit conductors.

Images