A distribution box with fire protection

Abstract

The application discloses a distribution box with fire-retardant protection, and particularly relates to the technical field of distribution boxes, which comprises a box body, a back plate and a fire-retardant part arranged in the box body, wherein the fire-retardant part comprises a mounting piece arranged on the back plate, and the mounting piece is internally provided with an isolating assembly and a fire extinguishing assembly; the isolating assembly comprises a cutting piece arranged in the mounting piece, and the isolating assembly further comprises an elastic sealing piece arranged in the mounting piece; the elastic sealing piece can pull one end of a cut-off conductor, so that an obvious breakpoint is formed at the cut-off position; when combustion occurs in the distribution box, the cutting piece is used to cut off the burning conductor, and after the conductor is cut off, the fire extinguishing assembly is used to spray fire extinguishing medium to the wiring port of the switch device and the inside of the guide groove, so that the fire extinguishing medium directly acts on the fire source, and the problem that the fire spreads rapidly along the conductor insulation layer in the initial stage of the fire and cannot be prevented due to low fire extinguishing efficiency is solved.

Description

Technical Field

[0001] This invention relates to the field of distribution box technology, and more specifically, to a distribution box with flame-retardant protection. Background Technology

[0002] A distribution box is a low-voltage device in a power system used for centralized distribution, control, and protection of electrical energy. It typically consists of a box, controller, and multiple switching devices, which are connected to external lines by wires. It is responsible for distributing the main power supply from the outside to various branch circuits and providing overload, short-circuit, or leakage protection for each circuit, ensuring the safety and stability of electricity use in homes, factories, office buildings, and other similar locations.

[0003] However, due to the dense electrical circuits and numerous contact points within distribution boxes, long-term operation can easily lead to electrical fires caused by increased contact resistance, insulation aging, overload, or external factors resulting in localized overheating and arcing. Particularly at the wiring terminals of switchgear, wire connection points are the most common areas prone to thermal failures. Once combustion occurs, the flames can spread rapidly along the wire insulation layer and may ignite other components within the distribution box, escalating the fire. Current technologies for fire protection in distribution boxes primarily employ overcurrent protection devices such as fuses and circuit breakers. These devices cut off the circuit when they detect overload or short-circuit current, but their operation relies on current anomalies and cannot directly respond to localized overheating or open flames caused by poor contact, nor do they possess active flame-retardant functions. Some distribution boxes use total flooding gas fire suppression systems or aerosol fire suppression devices, which spray fire extinguishing media into the entire distribution box when smoke or temperature abnormalities are detected. Although these methods can extinguish open flames, the global release method cannot accurately suppress the actual fire at the wiring terminals, and cannot prevent the flames from spreading rapidly along the insulation layer of the wires in the early stages of a fire.

[0004] Therefore, this invention proposes a distribution box with flame-retardant protection to solve the above problems. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, embodiments of the present invention provide a distribution box with flame-retardant protection to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a distribution box with flame-retardant protection, comprising: a box body, wherein a back plate and a flame-retardant part are provided inside the box body, the flame-retardant part includes a mounting component provided on the back plate, and an isolation component and a fire extinguishing component are provided inside the mounting component; the isolation component includes a cutting component provided inside the mounting component, the cutting component being able to cut and isolate a wire by sliding, the isolation component also including an elastic sealing component provided inside the mounting component, the elastic sealing component being able to pull one end of the cut wire to create a clear break point; the fire extinguishing component includes a fire extinguishing box provided inside the mounting component, the fire extinguishing box containing a fire extinguishing medium, and a triggering component provided inside the fire extinguishing box, wherein when a fire occurs inside the distribution box, the triggering component can generate pressure inside the fire extinguishing box to propel the fire extinguishing medium to spray.

[0007] Preferably, the mounting component has a guide groove inside for the wire to pass through, a guide plate is slidably connected inside the guide groove, the elastic seal is annular, and one end of the guide plate is fixedly connected to the side of the elastic seal near the outer circle.

[0008] Preferably, a first elastic element is provided inside the guide groove, one end of the first elastic element is fixedly connected to the end of the guide plate away from the elastic seal, and the other end of the first elastic element is fixedly connected to the inner wall of the guide groove.

[0009] Preferably, one end of the mounting component is provided with a second elastic element, one end of the second elastic element is fixedly connected to the cutting element, and the other end of the second elastic element is fixedly connected to the inner wall of the mounting component. The cutting element is horizontally arranged along the cross-sectional direction of the guide groove, and the cutting element can slide through the guide groove.

[0010] Preferably, the triggering component includes a first electrode plate fixedly connected inside the mounting component and a second electrode plate slidably connected inside the mounting component, and a push plate is slidably connected inside the fire extinguishing box, the push plate dividing the fire extinguishing box into two chambers.

[0011] Preferably, one of the chambers of the fire extinguishing box is provided with an inflation section, and the other chamber is filled with a fire extinguishing medium. The inflation section is electrically connected to the first electrode plate and the second electrode plate. The inflation section includes a backup power supply and an inflation section provided inside the fire extinguishing box. When the first electrode plate and the second electrode plate come into contact, the backup power supply is energized, thereby triggering the inflation section to expand.

[0012] Preferably, the mounting component has an internal mounting groove, one end of the cutting component can slide into the mounting groove, the first electrode plate is fixedly connected to the end of the mounting groove away from the cutting component, and the second electrode plate is slidably connected to the mounting groove.

[0013] Preferably, one end of the guide groove near the elastic seal is connected to the chamber of the fire extinguishing box that is filled with the extinguishing medium. A spray hole is provided on the side wall of the chamber of the fire extinguishing box that is filled with the extinguishing medium. A pressure relief valve is provided at the connection between the spray hole and the guide groove.

[0014] Preferably, the end of the mounting component away from the fire extinguishing box is provided with a brightness sensor, a temperature sensor and a smoke sensor, the end of the cutting component away from the guide groove is fixedly connected with an armature, and the end of the mounting component away from the fire extinguishing box is fixedly connected with an electromagnetic component.

[0015] Preferably, a controller is installed inside the enclosure. The controller is electrically connected to a brightness sensor, a temperature sensor, a smoke sensor, and an electromagnetic component. Multiple switching devices are installed on the back panel. Multiple mounting components are installed at the wiring ports of the multiple switching devices. The multiple switching devices are electrically connected to the controller.

[0016] The technical effects and advantages of this invention are as follows: When a fire occurs inside the distribution box, this invention, by having the controller cut off the power to the switching equipment and then using a cutting component to sever the burning wires, simultaneously sprays extinguishing media onto the wiring ports of the switching equipment and inside the guide groove through a fire extinguishing component. This allows the extinguishing media to directly act on the fire source, avoiding the problem that a global release of the extinguishing media cannot accurately extinguish the fire at the actual burning wiring port and cannot prevent the flames from spreading rapidly along the insulation layer of the wires in the early stages of a fire. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a front view of the overall structure of the present invention.

[0019] Figure 3 This is a cross-sectional view of the overall structure of the present invention.

[0020] Figure 4 This is a cross-sectional view of the mounting component when the present invention is not installed onto the wire.

[0021] Figure 5 This is a schematic diagram of the cutting component structure of the present invention.

[0022] Figure 6 This is a schematic diagram of the elastic sealing element structure of the present invention.

[0023] Figure 7 This is a cross-sectional view of the mounting component when installing the wire in this invention.

[0024] Figure 8 This is a cross-sectional view of the mounting component when the wire of the present invention is cut.

[0025] The attached figures are labeled as follows: 1. Housing; 11. Back plate; 12. Switchgear; 2. Mounting component; 21. Isolation assembly; 211. Cutting component; 212. Elastic seal; 213. Second elastic component; 22. Fire extinguishing assembly; 221. Fire extinguishing box; 222. Triggering assembly; 223. First electrode plate; 224. Second electrode plate; 225. Push plate; 23. Guide groove; 231. Guide plate; 232. First elastic component; 24. Mounting groove. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1

[0028] In actual use, it has been found that the wire connection point at the wiring port of the switchgear 12 is the most common area of ​​high incidence of thermal failure. Once a fire occurs, the flame will spread rapidly along the insulation layer of the wire and may ignite other components in the distribution box, causing the fire accident to escalate. This embodiment is invented to solve the above problems.

[0029] Please see Figures 1 to 8As shown, an embodiment of the present invention provides a distribution box with flame-retardant protection, including a box body 1. The box body 1 has a back plate 11 and a flame-retardant section inside. The flame-retardant section includes a mounting member 2 mounted on the back plate 11. The mounting member 2 has an isolation component 21 and a fire extinguishing component 22 inside. The isolation component 21 includes a cutting member 211 inside the mounting member 2, which can cut the wire by sliding and isolate the burning part of the wire from the unburned part. The isolation component 21 also includes an elastic sealing member 212 inside the mounting member 2, which can pull one end of the cut wire to create a clear break point and prevent the flame from spreading along the wire. The fire extinguishing component 22 includes a fire extinguishing box 221 inside the mounting member 2, which contains a fire extinguishing medium and a triggering component 222. When the fire extinguishing component 221 is activated, the fire extinguishing component 222 is activated. When combustion occurs inside the electrical box, the triggering component 222 can generate pressure inside the fire extinguishing box 221 to propel the extinguishing medium to spray. The fire extinguishing box 221 is detachably connected to the mounting component 2, and the mounting component 2 is detachably fixedly connected to the back plate 11, for example, by a threaded connection. The extinguishing medium is existing technology and will not be described in detail here. For example, the extinguishing medium is perfluorohexanone, nitrogen, carbon dioxide, etc. Perfluorohexanone has a very strong heat-absorbing vaporization ability, which can instantly remove the heat from the arc root and arc column, making it impossible to maintain and forcing the arc to be extinguished before the AC naturally crosses zero. The high-pressure jet of nitrogen or carbon dioxide has a strong arc-blowing effect, which can stretch and cool the arc, forcing the arc to extinguish. The above-mentioned extinguishing media can prevent the generation of arcs during the flame-retardant process. Those skilled in the art can select the extinguishing medium that can be used for electrical fire extinguishing according to actual working needs, and no limitation is made here.

[0030] Please see Figure 4 and Figure 7As shown, the mounting component 2 has a guide groove 23 for the wire to pass through. A guide plate 231 is slidably connected inside the guide groove 23. The elastic seal 212 is annular. One end of the guide plate 231 is fixedly connected to the side of the elastic seal 212 near its outer circle. During the installation of the wire to the wiring port of the switchgear 12, when the wire passes through the guide groove 23 and comes into contact with the elastic seal 212, the wire is pressed further to squeeze the inner circle of the elastic seal 212. This causes the inner circle of the elastic seal 212 to expand outward and the guide plate 231 to move towards the wiring port of the switchgear 12 due to the friction generated by the tight contact between the wire and the elastic seal 212. The elastic seal 212 is stretched towards the wiring port of the switchgear 12 due to pressure until the inner diameter of the elastic seal 212 is the same as that of the wire. The wire is then pressed to pass through the elastic seal 212 and is installed at the wiring port of the switchgear 12. The inner circle of the elastic seal 212 is in close contact with the outer wall of the wire, and one end of the wire is fixedly connected to the wiring port of the switchgear 12. Therefore, due to friction, the elastic seal 212 and the guide plate 231 will not reset. The position of the guide groove 23 corresponds to the wiring port. The elastic seal 212 is made of a high-temperature resistant elastic material, such as high-temperature resistant rubber, which is existing technology and is not limited here.

[0031] Please see Figure 4 and Figure 6 As shown, a first elastic element 232 is provided inside the guide groove 23. One end of the first elastic element 232 is fixedly connected to the end of the guide plate 231 away from the elastic seal 212, and the other end of the first elastic element 232 is fixedly connected to the inner wall of the guide groove 23.

[0032] Please see Figure 4 and Figure 5 As shown, a second elastic element 213 is provided at one end of the mounting component 2. One end of the second elastic element 213 is fixedly connected to the cutting element 211, and the other end of the second elastic element 213 is fixedly connected to the inner wall of the mounting component 2. The cutting element 211 is horizontally arranged along the cross-sectional direction of the guide groove 23. The cutting element 211 can slide through the guide groove 23. The cutting element 211 is made of insulating material. The end of the cutting element 211 near the guide groove 23 is a sharp conical surface used to cut the wire. The wire is the cable between each switch device 12. Its thickness is much smaller than that of the busbar and the incoming cable, and it can be easily cut by the cutting element 211. The operator can also replace the second elastic element 213 with a larger elastic force according to the actual work needs to prevent the cutting element 211 from failing to cut the wire in a short time. This is the prior art and will not be described in detail here.

[0033] Please see Figure 7 and Figure 8As shown, the triggering component 222 includes a first electrode plate 223 fixedly connected inside the mounting component 2 and a second electrode plate 224 slidably connected inside the mounting component 2. A push plate 225 is slidably connected inside the fire extinguishing box 221, which divides the fire extinguishing box 221 into two chambers.

[0034] The triggering component 222 also includes an inflation section disposed inside one of the chambers of the fire extinguishing box 221, and another chamber filled with fire extinguishing medium. The inflation section is electrically connected to the first electrode plate 223 and the second electrode plate 224. The inflation section includes a backup power supply disposed inside the fire extinguishing box 221 and the inflation section. When the first electrode plate 223 and the second electrode plate 224 come into contact, the backup power supply is energized, thereby triggering the inflation section to expand. The inflation port of the inflation section is provided with a chemical material that generates nitrogen gas through a chemical reaction, such as a chemical mixture mainly composed of guanidine nitrate. When the backup power supply is energized, the chemical material at the inflation port of the inflation section undergoes a chemical reaction and instantly generates a large amount of nitrogen gas.

[0035] Please see Figure 4 As shown, the mounting component 2 has a mounting groove 24 inside. One end of the cutting component 211 can slide into the mounting groove 24. The first electrode plate 223 is fixedly connected to the end of the mounting groove 24 away from the cutting component 211, and the second electrode plate 224 is slidably connected to the mounting groove 24. Please refer to [link to documentation]. Figure 7 and Figure 8 As shown, when one end of the cutting piece 211 slides into the mounting groove 24, the cutting piece 211 penetrates the guide groove 23 and cooperates with the elastic seal 212 to form a relatively closed space in the guide groove 23, isolating the fire source from the wire inlet side. The mounting groove 24 is provided with a reset elastic element for resetting the second electrode plate 224. One end of the reset elastic element is fixedly connected to the second electrode plate 224 and the other end is fixedly connected to the mounting groove 24. For example, a pneumatic spring or a reset spring is used, which is not limited here.

[0036] Please see Figure 4 As shown, the end of the guide groove 23 near the elastic seal 212 is connected to the chamber of the fire extinguishing box 221 that is filled with the fire extinguishing medium. The side wall of the chamber of the fire extinguishing box 221 that is filled with the fire extinguishing medium is provided with a spray hole, and a pressure relief valve is provided at the connection between the spray hole and the guide groove 23.

[0037] Please see Figure 4 and Figure 5 As shown, a brightness sensor, a temperature sensor, and a smoke sensor are provided at the end of the mounting component 2 away from the fire extinguishing box 221. An armature is fixedly connected at the end of the cutting component 211 away from the guide groove 23. An electromagnetic component is fixedly connected at the end of the mounting component 2 away from the fire extinguishing box 221.

[0038] Please see Figure 2 and Figure 3 As shown, the enclosure 1 contains a controller, which is electrically connected to a brightness sensor, a temperature sensor, a smoke sensor, and an electromagnetic component. Multiple switching devices 12 are mounted on the back panel 11. Multiple mounting brackets 2 are installed at the connection ports of each of the switching devices 12. The multiple switching devices 12 are electrically connected to the controller. The enclosure 1 contains a backup power supply, which is electrically connected to the electromagnetic component and the controller. The backup power supply is existing technology and is not limited here; it can be a battery, etc. When the distribution box is operating normally, it can supply power and charge the battery. The brightness sensor, temperature sensor, and smoke sensor are used to detect whether combustion occurs at the connection ports of the switching devices 12. When the signal detected by any sensor exceeds a threshold, combustion is determined to have occurred, and the detection signal is transmitted to the controller.

[0039] In use, initially, the electromagnetic component is energized and attracts the armature, causing the cutting piece 211 to be positioned near the electromagnetic component. The second elastic element 213 is compressed, and the wire is fixedly connected to the wiring port of the switch device 12. The elastic sealing element 212 is in close contact with the outer wall of the wire and is stretched towards the wiring port of the switch device 12. The guide plate 231 is positioned near the switch device 12, and the first elastic element 232 is stretched. When any of the brightness sensor, temperature sensor, or smoke sensor inside the housing 1 detects combustion at the wiring port of the switch device 12, the controller controls the switch device 12 and the upstream power supply at the bus end to disconnect the power, thereby completely de-energizing multiple switch devices 12 inside the distribution box to prevent the burning circuit from causing a short circuit in other switch devices 12. At the same time, the corresponding electromagnetic component is de-energized, so that the electromagnetic component no longer attracts the armature, and the second elastic element 213 relaxes. The cutting element 211 is ejected towards the guide groove 23 and penetrates the guide groove 23 to cut the wire inside the guide groove 23. When the wire inside the guide groove 23 is cut, the part of the cut wire inside the guide groove 23 is no longer fixedly connected to the wiring port of the switch device 12. This causes the elastic seal 212 to retract away from the switch device 12. At the same time, the first elastic element 232 retracts and drives the guide plate 231 to move away from the switch device 12. This creates a clear break point between the part of the cut wire inside the guide groove 23 and the part fixedly connected to the wiring port. Meanwhile, the cutting element 211 and the elastic seal 212 make the guide groove 23 a relatively closed space, isolating the fire source from the wire inlet side. This effectively prevents the flame from spreading rapidly along the insulation layer of the wire when a fire occurs at the wiring port of the switch device 12, and may ignite other components inside the enclosure 1, causing the fire to escalate.

[0040] Example 2

[0041] In practical use, it was found that the global release method could not accurately suppress the actual fire at the wiring terminal, resulting in low fire extinguishing efficiency and failure to prevent the flames from spreading rapidly along the insulation layer of the wire in the early stages of a fire. Furthermore, it wasted a lot of resources. Further improvements were made based on the above embodiments.

[0042] Based on the above embodiment, during use, when combustion occurs at the wiring port of the switching device 12, the controller controls the electromagnetic component to be de-energized, causing the second elastic element 213 to expand, thereby causing the cutting element 211 to pop out towards the guide groove 23 and penetrate the guide groove 23 to cut the wire inside the guide groove 23. After the cutting element 211 cuts the wire, due to the elastic force of the second elastic element 213, the cutting element 211 continues to move towards the mounting groove 24. When one end of the cutting element 211 extends into the mounting groove 24, the cutting element 211 squeezes the second electrode plate 224, causing it to slide towards the first electrode plate 223 inside the mounting groove 24. When the second electrode plate 224 contacts the first electrode plate 223, the backup power supply is energized, causing the chemical material inside the inflation part to... A chemical reaction produces a large amount of gas, which causes the inflation section to expand and compress the push plate 225. This, in turn, causes the push plate 225 to compress the extinguishing medium inside the fire extinguishing box 221. When the pressure of the pressure relief valve at the connection between the nozzle and the guide groove 23 exceeds the threshold, the pressure relief valve opens, allowing the extinguishing medium to be sprayed from inside the fire extinguishing box 221 to the wiring port of the switchgear 12 and inside the guide groove 23. When a fire occurs inside the distribution box, the switchgear 12 is de-energized by the controller, and then the burning wire is cut by the cutting component 211 to prevent the flame from spreading along the insulation layer of the wire. At the same time, after the wire is cut, the extinguishing component 22 sprays the extinguishing medium onto the wiring port of the switchgear 12 and inside the guide groove 23, so that the extinguishing medium acts directly on the fire source, thereby achieving precise suppression of the fire inside the distribution box.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A distribution box with flame-retardant protection, comprising a box body (1), wherein a back panel (11) is provided inside the box body (1), characterized in that, Also includes: The flame-retardant part includes a mounting component (2) disposed on the back plate (11), and the mounting component (2) is provided with an isolation component (21) and a fire extinguishing component (22). The isolation component (21) includes a cutting element (211) disposed inside the mounting component (2), which can cut and isolate the wire by sliding. The isolation component (21) also includes an elastic seal (212) disposed inside the mounting component (2), which can pull one end of the cut wire to create a clear break point and prevent open flame from spreading along the wire. The fire extinguishing assembly (22) includes a fire extinguishing box (221) disposed inside the mounting component (2). The fire extinguishing box (221) contains a fire extinguishing medium. The fire extinguishing box (221) contains a triggering component (222). When a fire occurs inside the distribution box, the triggering component (222) can generate pressure inside the fire extinguishing box (221) to push the fire extinguishing medium to spray.

2. The distribution box with flame-retardant protection according to claim 1, characterized in that: The mounting component (2) has a guide groove (23) for the wire to pass through. A guide plate (231) is slidably connected inside the guide groove (23). The elastic seal (212) is annular. One end of the guide plate (231) is fixedly connected to the side of the elastic seal (212) near the outer circle.

3. The distribution box with flame-retardant protection according to claim 2, characterized in that: The guide groove (23) is provided with a first elastic element (232). One end of the first elastic element (232) is fixedly connected to the end of the guide plate (231) away from the elastic seal (212), and the other end of the first elastic element (232) is fixedly connected to the inner wall of the guide groove (23).

4. The distribution box with flame-retardant protection according to claim 3, characterized in that: One end of the mounting component (2) is provided with a second elastic element (213). One end of the second elastic element (213) is fixedly connected to the cutting element (211), and the other end of the second elastic element (213) is fixedly connected to the inner wall of the mounting component (2). The cutting element (211) is horizontally arranged along the cross-sectional direction of the guide groove (23), and the cutting element (211) can slide through the guide groove (23).

5. The distribution box with flame-retardant protection according to claim 1, characterized in that: The triggering component (222) includes a first electrode plate (223) fixedly connected inside the mounting component (2) and a second electrode plate (224) slidably connected inside the mounting component (2). A push plate (225) is slidably connected inside the fire extinguishing box (221), and the push plate (225) divides the fire extinguishing box (221) into two chambers.

6. The distribution box with flame-retardant protection according to claim 5, characterized in that: The triggering component (222) also includes an inflation section disposed inside one of the chambers of the fire extinguishing box (221), and the other chamber is filled with fire extinguishing medium. The inflation section is electrically connected to the first electrode plate (223) and the second electrode plate (224). The inflation section includes a backup power supply disposed inside the fire extinguishing box (221) and the inflation section. When the first electrode plate (223) and the second electrode plate (224) come into contact, the backup power supply is energized, thereby triggering the inflation section to expand.

7. The distribution box with flame-retardant protection according to claim 6, characterized in that: The mounting component (2) has an internal mounting groove (24). One end of the cutting component (211) can slide into the mounting groove (24). The first electrode plate (223) is fixedly connected to the end of the mounting groove (24) away from the cutting component (211), and the second electrode plate (224) is slidably connected to the inside of the mounting groove (24).

8. The distribution box with flame-retardant protection according to claim 2, characterized in that: The end of the guide groove (23) near the elastic seal (212) is connected to the chamber of the fire extinguishing box (221) filled with fire extinguishing medium. A spray hole is provided on the side wall of the chamber of the fire extinguishing box (221) filled with fire extinguishing medium. A pressure relief valve is provided at the connection between the spray hole and the guide groove (23).

9. The distribution box with flame-retardant protection according to claim 8, characterized in that: The end of the mounting component (2) away from the fire extinguishing box (221) is equipped with a brightness sensor, a temperature sensor and a smoke sensor. The end of the cutting component (211) away from the guide groove (23) is fixedly connected with an armature. The end of the mounting component (2) away from the fire extinguishing box (221) is fixedly connected with an electromagnetic component.

10. The distribution box with flame-retardant protection according to claim 9, characterized in that, The housing (1) is equipped with a controller, which is connected to a brightness sensor, a temperature sensor, a smoke sensor and an electromagnetic component. Multiple switching devices (12) are installed on the back panel (11). Multiple mounting parts (2) are installed at the wiring ports of the multiple switching devices (12). The multiple switching devices (12) are connected to the controller. The housing (1) is equipped with a backup power supply, which is connected to the electromagnetic component and the controller.

Images