Multi-cavity distribution box

Abstract

The utility model relates to the technical field of distribution boxes, in particular to a multi-cavity distribution box which comprises a box body, a box door is hinged to the front side of the box body through a hinge, a height regulating mechanism is installed in the inner space of the box body, and a first bearing piece and a second bearing piece are arranged on the height regulating mechanism at intervals from top to bottom. A first heat dissipation piece, a second heat dissipation piece and a third heat dissipation piece are respectively arranged at the upper part, the middle part and the lower part of the side walls of the box body at the two sides of the upper cavity; and a first electrical element, a second electrical element and a third electrical element are respectively arranged in the upper cavity, the middle cavity and the lower cavity. According to the multi-cavity design of the distribution box, different types of electrical elements are classified and placed, and a maintainer can quickly position the cavity where the element needing to be maintained is located; and the peripheries of the electrical elements are exposed by adopting a bottom or top mounting mode, so that direct contact inspection is facilitated, and the maintenance time and difficulty are reduced.

Description

Technical Field

[0001] This utility model relates to the field of distribution box technology, and in particular to a multi-chamber distribution box. Background Technology

[0002] A distribution box is an electrical device used for centralized control and distribution of electrical energy, typically installed in buildings, factories, shopping malls, and other locations. The traditional distribution box mainly consists of two parts: the box body and the internal electrical components. The box body comprises an outer shell and a door, and usually has internal brackets and partitions fixedly installed. The internal electrical components are housed within the box body.

[0003] A search revealed a distribution box with a mounting bracket in patent application number CN202121885432.7. Its main structure includes a distribution box, a cooling fan fixedly connected to the upper middle part of the distribution box, a distribution box door movably connected to the left front part of the distribution box, a wiring groove opened at the front of the distribution box, ventilation holes through the left and right sides of the middle of the left and right sides of the wiring groove, and four through-holes for wires in the rear wall of the wiring groove.

[0004] It can be seen that the electrical components inside the distribution box are concentrated on the rear wall, making it easy for heat generated during operation to accumulate locally. In addition, although the distribution box is equipped with a cooling fan and ventilation holes, the single cavity is not conducive to the orderly exhaust of hot air and the effective replenishment of cold air, which may lead to uneven temperature distribution inside the box.

[0005] All electrical components are installed on the rear wall, making it inconvenient to inspect or replace a component due to space constraints and the concentration of components. Especially when there are many components and complex wiring, maintenance personnel find it difficult to quickly and accurately locate and operate on the faulty component, increasing the difficulty and time cost of maintenance.

[0006] Based on this, the present invention designs a distribution box structure with multiple chambers to better solve the problems existing in the prior art. Summary of the Invention

[0007] To solve one of the aforementioned technical problems, the present invention provides a multi-chamber distribution box, comprising a box body with a door hinged at the front. A height adjustment mechanism is installed within the internal space of the box body. A first support member and a second support member are spaced apart from top to bottom on the height adjustment mechanism, sequentially dividing the internal space of the box body into an upper chamber, a middle chamber, and a lower chamber. A first heat dissipation member, a second heat dissipation member, and a third heat dissipation member are respectively installed on the upper, middle, and lower parts of the side walls of the box body on both sides of the upper chamber. The relative spacing between the first support member and the second support member is adjustable. A first electrical component, a second electrical component, and a third electrical component are installed inside the upper chamber, the middle chamber, and the lower chamber. The first electrical component is installed on the top of the first support member, the second electrical component is installed on the top of the second support member, and the third electrical component is installed on the bottom of the second support member.

[0008] In any of the above embodiments, preferably, the height adjustment mechanism includes four fixed screw tubes fixed at the four corners of the bottom of the internal space of the housing, the center lines of each fixed screw tube forming a rectangle, a vertical screw rod screwed on the top of each fixed screw tube, the top of each vertical screw rod screwed through a threaded through hole at the corresponding position on the top of the housing, a top locking nut screwed on the external threaded sidewall of each vertical screw rod on the top of the housing, and the four corners of the first support member and the second support member are installed on the external threaded sidewall of the corresponding four vertical screw rods.

[0009] In any of the above embodiments, the first support member includes a first partition plate horizontally disposed on the upper part of the internal space of the housing. The four corners of the first partition plate are respectively provided with through holes that are sleeved on the outer side wall of the vertical screw. The upper and lower parts of each of the first partition plates are respectively screwed onto the external thread side wall of each of the vertical screws. The two oppositely disposed first locking nuts cooperate to clamp and position the first partition plate. The first electrical component is installed on the top of the first partition plate.

[0010] In any of the above embodiments, the second support member includes a second partition horizontally disposed in the middle of the internal space of the housing. The four corners of the second partition are respectively provided with through holes that are sleeved on the outer sidewalls of the vertical screws. A second locking nut is screwed onto the external threaded sidewalls of the vertical screws at the upper and lower parts of each of the second partitions. The two oppositely disposed second locking nuts cooperate to clamp and position the second partition. The second electrical component is installed at the top of the second partition, and the third electrical component is installed at the bottom of the second partition.

[0011] In any of the above embodiments, it is preferred that top heat dissipation components are installed on both sides of the top of the housing.

[0012] In any of the above solutions, it is preferred that each of the first heat sink, each of the second heat sink, each of the third heat sink, and each of the top heat sinks are air-cooled heat sinks.

[0013] In any of the above embodiments, it is preferred that the air-cooled radiator includes an air duct fixedly installed on the housing at the ventilation opening corresponding to the housing, and a cooling fan is installed at the outlet end of the air duct.

[0014] In any of the above embodiments, it is preferred that the first electrical component includes a circuit breaker and a current transformer installed inside the upper cavity, both of which are connected to the busbar circuit, and the bottoms of the busbar, circuit breaker, and current transformer are all fixed to the top of the first support.

[0015] In any of the above embodiments, the preferred embodiment is that the second electrical component includes a contactor and a surge protector installed inside the central cavity. The surge protector circuit is connected to the power supply line of the distribution box, and the input terminal of the contactor is connected to the power line led out from the first terminal block. The first terminal block is connected to the busbar, and the bottom of the contactor, the surge protector, and the first terminal block are all fixedly installed on the top of the second support.

[0016] In any of the above embodiments, the preferred embodiment is that the third electrical component includes a thermal relay, a miniature circuit breaker, and a second terminal block installed inside the lower cavity. The tops of the thermal relay, miniature circuit breaker, and second terminal block are all fixedly installed at the bottom of the second support. The input terminal of the thermal relay is connected to the output terminal of the contactor, and the output terminal of the thermal relay is connected to the matching load. A branch line is led out from the busbar and connected to the input terminal of the miniature circuit breaker. The output terminal of the miniature circuit breaker is connected to the matching load via the second terminal block.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. The multi-chamber design of the distribution box in this utility model classifies and places different types of electrical components, allowing maintenance personnel to quickly locate the chamber where the component to be inspected is located; and each electrical component is installed at the bottom or top, exposing its surroundings, which facilitates direct contact and inspection, reducing maintenance time and difficulty.

[0019] 2. During installation, the height adjustment mechanism allows for adjustment of the positions and spacing of the first and second supports, and quick locking after adjustment. In actual installation, the height of the upper, middle, and lower chambers can be flexibly adjusted according to the size requirements of different electrical components, facilitating the installation and replacement of components.

[0020] 3. This distribution box changes the traditional method of installing heat sinks on the rear wall of the box. Instead, the first, second, and third heat sinks are installed on their respective support components. Together with the top heat sinks installed on both sides of the top of the box, a comprehensive heat dissipation structure can be formed to remove heat from different angles and positions, avoid local heat accumulation, meet the differentiated heat dissipation needs of different areas in the distribution box, ensure that electrical components operate stably in a suitable temperature environment, and extend the service life of the distribution box. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn to scale.

[0022] Figure 1 This is a schematic diagram of the internal structure of this utility model.

[0023] Figure 2 This is a partial three-dimensional structural schematic diagram of the present invention.

[0024] Figure 3 This is a partial internal structure diagram of the present invention.

[0025] Figure 4 This is a three-dimensional structural diagram of the height adjustment mechanism of this utility model with the first support component installed and the first support component in its state.

[0026] Figure 5 for Figure 4 A schematic diagram of the main structure.

[0027] In the diagram, 1. Enclosure; 2. Enclosure door; 3. Second terminal block; 4. First support; 5. Second support; 6. Upper chamber; 7. Middle chamber; 8. Lower chamber; 9. First heat sink; 10. Second heat sink; 11. Third heat sink; 12. First electrical component; 13. Second electrical component; 14. Third electrical component; 15. Fixing solenoid; 16. Vertical screw; 17. Top locking nut; 18. First partition; 19. First locking nut; 20. Second partition; 21. Second locking nut; 22. Top heat sink; 23. Miniature circuit breaker; 24. Air duct; 25. Cooling fan; 26. Circuit breaker; 27. Current transformer; 28. Busbar; 29. ​​Contactor; 30. Surge protector; 31. First terminal block; 32. Thermal relay. Detailed Implementation

[0028] The embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of the present utility model, and are therefore merely examples and should not be construed as limiting the scope of protection of the present utility model. The specific structure of the present utility model is as follows: Figures 1-5 As shown in the image.

[0029] Example 1: A multi-chamber distribution box includes a box body 1. A door 2 is hinged at the front of the box body 1. A height adjustment mechanism is installed inside the box body 1. A first support 4 and a second support 5 are arranged at intervals from top to bottom on the height adjustment mechanism. The first support 4 and the second support 5 sequentially divide the internal space of the box body 1 into an upper chamber 6, a middle chamber 7, and a lower chamber 8. First heat dissipation components are installed on the upper, middle, and lower parts of the side walls of the box body 1 on both sides of the upper chamber 6. 9. A second heat sink 10 and a third heat sink 11. The relative spacing between the first support 4 and the second support 5 is adjustable. A first electrical component 12, a second electrical component 13, and a third electrical component 14 are installed inside the upper chamber 6, the middle chamber 7, and the lower chamber 8. The first electrical component 12 is installed on the top of the first support 4, the second electrical component 13 is installed on the top of the second support 5, and the third electrical component 14 is installed on the bottom of the second support 5.

[0030] During rapid adjustment and maintenance, the multi-chamber design of the multi-chamber distribution box in this utility model allows different types of electrical components to be placed in categories, enabling maintenance personnel to quickly locate the component that needs maintenance in the upper chamber 6, middle chamber 7, or lower chamber 8, thereby improving maintenance efficiency.

[0031] Meanwhile, when used with the height adjustment mechanism, the distance between the first support 4 and the second support 5 is adjustable, allowing for flexible adjustment of the chamber height according to the size requirements of different electrical components, facilitating the installation and replacement of components.

[0032] In addition, each of the first heat sink 9, the second heat sink 10, and the third heat sink 11 is installed on the first support 4 and the second support 5 respectively, which changes the traditional installation method of installing on the rear wall of the box, effectively improving the heat dissipation effect and avoiding local heat accumulation.

[0033] In any of the above embodiments, the preferred embodiment is that the height adjustment mechanism includes four fixing screw tubes 15 fixed at the four corners of the bottom of the internal space of the housing 1, and the center line of each fixing screw tube 15 forms a rectangle. A vertical screw rod 16 is screwed on the top of each fixing screw tube 15. The top of each vertical screw rod 16 is screwed through a threaded through hole at the corresponding position on the top of the housing 1. A top locking nut 17 is screwed on the external threaded sidewall of each vertical screw rod 16 on the top of the housing 1. The four corners of the first support member 4 and the second support member 5 are installed on the external threaded sidewalls of the corresponding four vertical screw rods 16.

[0034] During rapid adjustment and maintenance, the relative space size of the upper chamber 6, middle chamber 7, and lower chamber 8 can be adjusted by adjusting the height and spacing of the first support 4 and the second support 5. This adjustment method is simple to operate and can quickly meet the installation and maintenance space requirements of different electrical components without disassembling too many parts.

[0035] In any of the above embodiments, the first support member 4 includes a first partition 18 horizontally disposed on the upper part of the internal space of the housing 1. The four corners of the first partition 18 are respectively provided with through holes that are sleeved on the outer side wall of the vertical screw 16. The upper and lower parts of each of the first partitions 18 are respectively screwed onto the external thread side wall of each of the vertical screws 16. The two oppositely disposed first locking nuts 19 cooperate to clamp and position the first partition 18. The first electrical component 12 is installed on the top of the first partition 18.

[0036] During rapid adjustment and maintenance, the first locking nut 19 can be quickly loosened or tightened, facilitating the disassembly or installation of the first partition 18, thereby enabling the maintenance or replacement of the first electrical component 12 on the first support 4. This clamping and positioning method is stable and reliable. Under normal use, the clamping and positioning of the two first locking nuts 19 ensures the stability of the first partition 18, while during maintenance, the fixing can be quickly released, saving maintenance time.

[0037] In any of the above embodiments, the second support member 5 preferably includes a second partition 20 horizontally disposed in the middle of the internal space of the housing 1. The four corners of the second partition 20 are respectively provided with through holes that are sleeved on the outer side wall of the vertical screw 16. The upper and lower parts of each of the vertical screw 16 are respectively screwed onto the external thread side wall. The two oppositely disposed second locking nuts 21 cooperate to clamp and position the second partition 20. The second electrical component 13 is installed on the top of the second partition 20, and the third electrical component 14 is installed on the bottom of the second partition 20.

[0038] During rapid adjustment and maintenance, the second locking nut 21 allows for quick disassembly and installation of the second partition 20, facilitating maintenance of the second electrical component 13 at the top and the third electrical component 14 at the bottom of the second support 5. Similar to the first support 4, its clamping and positioning structure ensures stability during normal locking and allows for rapid adjustment during maintenance, improving maintenance efficiency.

[0039] In any of the above embodiments, it is preferred that top heat sinks 22 are installed on both sides of the top of the housing 1.

[0040] The top heat sink 22 continuously dissipates heat during the operation of the distribution box, preventing excessively high temperatures inside the box from affecting the performance of electrical components. During maintenance, if an electrical component is found to malfunction due to overheating, the top heat sink 22 can be quickly checked for proper functioning, such as whether the cooling fan 25 is operating correctly. If the heat sink malfunctions, it can be easily replaced or repaired, ensuring the heat dissipation performance of the distribution box and preventing subsequent malfunctions caused by overheating issues.

[0041] In any of the above solutions, it is preferred that each of the first heat sink 9, each of the second heat sink 10, each of the third heat sink 11 and each of the top heat sink 22 adopts an air-cooled heat sink.

[0042] In any of the above embodiments, it is preferred that the air-cooled radiator includes an air duct 24 fixedly installed on the housing at the ventilation opening corresponding to the housing 1, and a cooling fan 25 is installed at the outlet end of the air duct 24.

[0043] The first heat sink 9, the second heat sink 10, the third heat sink 11, and the top heat sink 22 work together to dissipate heat from all directions in the distribution box, ensuring that the internal electrical components operate stably in a suitable temperature environment and extending the service life of the distribution box.

[0044] Heat sinks are distributed in different locations within the distribution box, forming a comprehensive heat dissipation network. This removes heat generated inside the distribution box from different angles and locations, preventing heat accumulation in localized areas and ensuring a more uniform temperature throughout the box.

[0045] Heat sinks at different locations dissipate heat generated in different parts of the distribution box. For example, during operation, electrical components generate heat at their upper, middle, and lower parts. The first heat sink 9, the second heat sink 10, and the third heat sink 11 dissipate heat to these parts respectively, effectively reducing the temperature around the electrical components. The top heat sink 22 promptly exhausts hot air rising to the top of the box, further enhancing the heat dissipation effect and ensuring that the heat inside the distribution box can be dissipated in a timely manner, maintaining a low temperature level.

[0046] Since the electrical components in different areas of the distribution box may generate different amounts of heat, the various heat sinks work together to meet these differentiated heat dissipation needs. For areas with higher heat generation, the power of the heat sinks can be increased to enhance heat dissipation; for areas with lower heat generation, relatively lower power heat sinks can also meet the heat dissipation requirements, allowing for more efficient energy utilization while ensuring the overall heat dissipation effect of the distribution box.

[0047] Example 2: Compared with Example 1, this example also includes the following technical features:

[0048] In any of the above embodiments, the first electrical component 12 includes a circuit breaker 26 and a current transformer 27 installed inside the upper chamber 6. The circuit breaker 26 and the current transformer 27 are both connected to the busbar 28. The bottoms of the busbar 28, the circuit breaker 26, and the current transformer 27 are all fixed to the top of the first support member 4.

[0049] The upper chamber 6 houses circuit breakers 26 and current transformers 27, forming the first electrical component 12, which facilitates maintenance personnel to quickly locate these components for inspection, maintenance, or replacement. Furthermore, the connection between the components and the busbar 28 makes the layout clear, allowing for quick troubleshooting by tracing the connection lines when troubleshooting circuit faults, thus improving maintenance efficiency and reducing power outage time.

[0050] In any of the above embodiments, the second electrical component 13 includes a contactor 29 and a surge protector 30 installed inside the middle chamber 7. The surge protector 30 is connected to the power supply line of the distribution box. The input end of the contactor 29 is connected to the power line led out from the first terminal block 31. The first terminal block 31 is connected to the busbar 28. The bottom of the contactor 29, the surge protector 30, and the first terminal block 31 are all fixedly installed on the top of the second support 5.

[0051] The layout of the central chamber 7 concentrates the second electrical components 13, such as contactor 29 and surge protector 30, making it easy for maintenance personnel to quickly locate them. From the power supply line to the first terminal 31 and then to the contactor 29, the fault location can be quickly traced during circuit troubleshooting, improving maintenance efficiency and ensuring the stability of the power supply to the distribution box.

[0052] In any of the above embodiments, the preferred embodiment is that the third electrical component 14 includes a thermal relay 32, a miniature circuit breaker 23, and a second terminal block 3 installed inside the lower chamber 8. The tops of the thermal relay 32, the miniature circuit breaker 23, and the second terminal block 3 are all fixedly installed at the bottom of the second support member 5. The input terminal of the thermal relay 32 is connected to the output terminal of the contactor 29, and the output terminal of the thermal relay 32 is connected to the matching load. A branch line is led out from the busbar 28 and connected to the input terminal of the miniature circuit breaker 23. The output terminal of the miniature circuit breaker 23 is connected to the matching load via the second terminal block 3.

[0053] The first electrical component 12, the second electrical component 13, and the third electrical component 14 are all mounted at the bottom or top, with their sides exposed. This allows maintenance personnel to directly access each part, facilitating quick fault location and troubleshooting. Maintenance personnel can easily inspect circuit breakers 26, instrument transformers 27, etc., and check line connections and component surfaces, reducing maintenance time and difficulty.

[0054] Additionally, bottom or top mounting creates a distance between the components and the enclosure walls, allowing for better airflow. The various heat sinks work together to effectively dissipate heat generated by the components, lowering the internal temperature and ensuring the electrical components operate in a suitable environment, thus extending their lifespan.

[0055] In summary, the multi-chamber design of the distribution box in this utility model categorizes and places different types of electrical components, allowing maintenance personnel to quickly locate the chamber containing the component requiring inspection. Furthermore, each electrical component is installed at the bottom or top, exposing its surroundings for easy direct contact and inspection, reducing maintenance time and difficulty. During installation, the height adjustment mechanism allows for adjustment of the positions and spacing of the first and second supports, with quick locking after adjustment. In actual installation, the heights of the upper, middle, and lower chambers can be flexibly adjusted according to the size requirements of different electrical components, facilitating component installation and replacement. This distribution box changes the traditional method of installing heat sinks on the rear wall of the box, instead installing the first, second, and third heat sinks on their respective supports. Combined with the top heat sinks installed on both sides of the top of the box, this forms a comprehensive heat dissipation structure that removes heat from different angles and positions, preventing localized heat accumulation and meeting the differentiated heat dissipation needs of different areas within the distribution box. This ensures stable operation of electrical components in a suitable temperature environment and extends the service life of the distribution box.

[0056] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model. For those skilled in the art, any alternative improvements or transformations made to the implementation of this utility model fall within the protection scope of this utility model.

[0057] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A multi-chamber distribution box, characterized in that: The device includes a housing with a door hinged at the front. A height adjustment mechanism is installed within the housing's interior space. A first support and a second support are spaced at intervals from top to bottom on the height adjustment mechanism, dividing the housing's interior space into an upper chamber, a middle chamber, and a lower chamber. A first heat dissipation component, a second heat dissipation component, and a third heat dissipation component are respectively installed on the upper, middle, and lower parts of the side walls of the housing on both sides of the upper chamber. The relative spacing between the first and second supports is adjustable. A first electrical component, a second electrical component, and a third electrical component are installed inside each of the upper, middle, and lower chambers. The first electrical component is installed on top of the first support, the second electrical component is installed on top of the second support, and the third electrical component is installed at the bottom of the second support.

2. The multi-chamber distribution box according to claim 1, characterized in that: The height adjustment mechanism includes four fixed screw tubes fixed at the four corners of the bottom of the internal space of the housing. The center line of each fixed screw tube forms a rectangle. A vertical screw is screwed on the top of each fixed screw tube. The top of each vertical screw is screwed through a threaded through hole at the corresponding position on the top of the housing. A top locking nut is screwed on the external threaded sidewall of each vertical screw on the top of the housing. The four corners of the first support and the second support are installed on the external threaded sidewall of the corresponding four vertical screws.

3. A multi-chamber distribution box according to claim 2, characterized in that: The first support includes a first partition plate horizontally disposed on the upper part of the internal space of the housing. The four corners of the first partition plate are respectively provided with through holes that are sleeved on the outer side wall of the vertical screw. The upper and lower parts of each of the first partition plates are respectively screwed on the external thread side wall of each of the vertical screws. The two oppositely disposed first locking nuts cooperate to clamp and position the first partition plate. The first electrical component is installed on the top of the first partition plate.

4. A multi-chamber distribution box according to claim 3, characterized in that: The second support includes a second partition horizontally disposed in the middle of the internal space of the housing. The four corners of the second partition are respectively provided with through holes that fit onto the outer sidewall of the vertical screw. A second locking nut is screwed onto the external threaded sidewall of each vertical screw at the upper and lower parts of each second partition. The two oppositely disposed second locking nuts cooperate to clamp and position the second partition. The second electrical component is installed at the top of the second partition, and the third electrical component is installed at the bottom of the second partition.

5. A multi-chamber distribution box according to claim 4, characterized in that: Top heat dissipation components are installed on both sides of the top of the box.

6. A multi-chamber distribution box according to claim 5, characterized in that: Each of the first heat sink, each of the second heat sink, each of the third heat sink, and each of the top heat sinks are all air-cooled heat sinks.

7. A multi-chamber distribution box according to claim 6, characterized in that: The air-cooled radiator includes an air duct that is fixedly installed on the housing at the corresponding ventilation opening of the housing, and a cooling fan is installed at the outlet end of the air duct.

8. A multi-chamber distribution box according to claim 7, characterized in that: The first electrical component includes a circuit breaker and a current transformer installed inside the upper chamber. The circuit breaker and the current transformer are both connected to the busbar circuit. The bottoms of the busbar, the circuit breaker, and the current transformer are all fixed to the top of the first support.

9. A multi-chamber distribution box according to claim 8, characterized in that: The second electrical component includes a contactor and a surge protector installed inside the central cavity. The surge protector circuit is connected to the power supply line of the distribution box. The input terminal of the contactor is connected to the power line led out from the first terminal block. The first terminal block is connected to the busbar. The bottom of the contactor, the surge protector, and the first terminal block are all fixedly installed on the top of the second support.

10. A multi-chamber distribution box according to claim 9, characterized in that: The third electrical component includes a thermal relay, a miniature circuit breaker, and a second terminal block installed inside the lower chamber. The tops of the thermal relay, miniature circuit breaker, and second terminal block are all fixedly installed on the bottom of the second support. The input terminal of the thermal relay is connected to the output terminal of the contactor, and the output terminal of the thermal relay is connected to the matching load. A branch line is led out from the busbar and connected to the input terminal of the miniature circuit breaker. The output terminal of the miniature circuit breaker is connected to the matching load via the second terminal block.

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