Circuit protection device applied to distribution box

Abstract

The invention relates to the related technical field of distribution boxes, and discloses a line protection device applied in a distribution box, which comprises a box body, an upper frame, a lower supporting plate, an upper protection cover, a side sliding plate and a circuit breaker, a front opening is formed in the front surface of the box body, and a side opening is formed in the side surface of the box body; multiple sets of fixing frames distributed at equal intervals are arranged in the box body, mounting bases are slidably mounted on the two sides of the fixing frames, the mounting bases are fixedly connected with the inner wall of the box body through bolts, side sliding plates are arranged on the front faces of the fixing frames, multiple sets of sliding connecting plates are fixedly connected to the backs of the side sliding plates, and one ends of the sliding connecting plates are connected to the middles of the side sliding plates; the problems that a traditional power distribution box is inconvenient to install and maintain, cables are prone to being pulled, and protection is insufficient are solved, the equipment operation convenience, connection reliability, operation stability and environmental adaptability are remarkably improved, and good practical value and popularization prospects are achieved.

Description

Technical Field

[0001] This invention relates to the technical field of distribution boxes, specifically a line protection device applied inside a distribution box. Background Technology

[0002] Distribution boxes, as important power distribution and control equipment in power systems, are widely used in industrial, commercial, and civil buildings. They typically contain various electrical components such as circuit breakers, contactors, and terminal blocks to control circuit switching, protection, and power distribution. In practical applications, the internal wiring layout of distribution boxes is complex, and components are densely packed. Traditional distribution boxes present problems such as limited operating space, difficult wiring, and inconvenient disassembly when installing, maintaining, and replacing circuit breakers and other components. Especially during maintenance, power often needs to be cut off and multiple cables removed, which not only affects power supply continuity but also poses certain safety risks. In existing technologies, distribution boxes typically employ a fixed installation structure, with circuit breakers directly mounted on guide rails inside the box. Installation and disassembly must be performed inside the box, which is space-constrained and makes it difficult to use tools, easily leading to insecure installations or loose wiring. Furthermore, the cables inside the box are usually fixedly wired; when a section needs to be moved or repaired, the cables are easily pulled, causing connections to loosen or even detach, affecting the reliability of electrical connections. Therefore, there is an urgent need for a distribution box internal wiring protection device that is structurally sound, easy to operate, convenient to maintain, and highly safe, capable of enabling the rapid installation and removal of components such as circuit breakers, and providing good cable management functions and protection performance, so as to meet the requirements of modern power systems for efficient, reliable, and intelligent power distribution equipment. Summary of the Invention

[0003] The purpose of this invention is to provide a line protection device for use in distribution boxes to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A line protection device for use in a distribution box includes a box body, an upper frame, a lower support plate, an upper protective cover, a side slide plate, and a circuit breaker; The front of the box is provided with a front opening, and the side of the box is provided with a side opening; The box is equipped with multiple sets of equally spaced fixing frames. Mounting seats are slidably installed on both sides of the fixing frames. The mounting seats are fastened to the inner wall of the box by bolts. The front of the fixing frame is equipped with a side slide plate. Multiple sets of sliding connecting plates are fixedly connected to the back of the side slide plate. One end of the sliding connecting plate is connected to the middle of the side slide plate, and the other end of the sliding connecting plate extends beyond the side slide plate to the outside of the side slide plate to form an extension arm. The fixing frame and the sliding connecting plate are slidably connected by ball bearing grooves. The side plate is provided with multiple sets of equally spaced bolt connection holes on both sides. The upper part of the bolt connection hole is a large hole and the lower part is a narrow groove. The side plate is provided with multiple sets of terminal block rails. Nuts are fixedly connected to both ends of the terminal block rails. The mounting bolt passes through the bolt connection hole and is threaded to the nut. Then, the threaded part of the mounting bolt is inserted into the narrow groove of the bolt connection hole. The large hole of the bolt connection hole is clearance-fitted with the head of the mounting bolt. Then, the terminal block rail is fixedly installed in the side plate. The circuit breaker is fixedly installed on the terminal block rail. When installing the circuit breaker, simply pull the side slide plate out from the inside of the side opening. At this point, the side slide plate is completely removed from the enclosure, while the extension arm of the sliding connecting plate remains slidably connected to the fixing bracket. The fixing bracket and the sliding connecting plate support and fix the side slide plate. Then, the operator can thread the mounting bolt into the nut at one end of the terminal block rail, insert the head of the bolt at one end of the terminal block rail into the large hole at the top of the bolt connection hole, and then press the terminal block rail down, thereby engaging the bolt's screw into the narrow groove at the bottom of the bolt connection hole. Finally, the nut and the head of the screw engage the terminal block... One end of the rail is clamped and fixed, and then the bolts of the other set of mounting bolts are threaded through the bolt connection holes on the other side of the side slide plate and connected to the nuts on the other end of the terminal block rail, thereby clamping and fixing the terminal block rail. Then the circuit breaker is fixedly installed on the terminal block rail. When the circuit breaker needs to be removed, simply unscrew the mounting bolts at one end of the terminal block rail, lift the other end, and pull it laterally to lift the head of the mounting bolt from the narrow groove of the bolt connection hole and pull it out from the large hole of the bolt connection hole. This achieves quick removal of the terminal block rail and avoids repeated drilling inside the equipment.

[0005] As a further aspect of the present invention: a notch is provided at the bottom of one end of the terminal block rail, thereby forming a pick-and-place groove on one side of the terminal block rail. The bottom of the pick-and-place groove does not contact the buckle on the back of the circuit breaker, so as to facilitate the quick removal of the circuit breaker after the buckle on the circuit breaker is damaged.

[0006] As a further aspect of the present invention: the bottom of the box is riveted to a lower frame, the lower support plate is set inside the lower frame, and multiple sets of foot support columns are set on the top of the lower frame. The foot support columns, the lower frame and the lower support plate are fixedly connected by bolts.

[0007] As a further aspect of the present invention: a wiring port is provided inside the lower support plate, and a fixed base is fixedly connected inside the wiring port. One end of a keel chain plate is rotatably connected to the fixed base, and the other end of the keel chain plate is rotatably connected to the side slide plate. An arc-shaped clamp is fixedly connected to the keel chain plate, and mounting grooves are provided on both sides of the arc-shaped clamp. The cable passes through the wiring port and is clamped and installed into the arc-shaped clamp. Cable ties are passed through the mounting grooves for bundling, thereby bundling and fixing the cable to the keel chain plate and limiting and fixing the cable. Then, when the side slide plate is slid out, the side slide plate drives the cable to move synchronously. At the same time, the cable is synchronously coiled and released under the action of the keel chain plate. During this process, the keel chain plate limits the cable, thereby preventing the side slide plate from generating traction force on the cable during the sliding out process, thus avoiding pulling on the cable connection and causing poor stability of the cable connection.

[0008] As a further aspect of the present invention: the top of the box is riveted to an upper frame with rivets, the top of the upper frame is provided with threaded holes, the upper protective cover is fixedly connected to the upper frame with bolts, the upper protective cover is designed to be higher in the front and lower in the back, the upper protective cover is provided with rainproof edges on the front and rear sides, the bottom of the rainproof edges is provided with vent holes, the top of the upper protective cover is provided with mounting holes, so that bolts can be easily installed through the mounting holes, and a sealing plug for sealing the mounting holes is installed in the mounting holes.

[0009] As a further aspect of the present invention: a first switch door is slidably installed in the front opening, a first door lock mounting hole is installed between the first switch door and the housing, and a door lock is installed in the first door lock mounting hole, thereby fixing the first switch door and the housing together through the door lock.

[0010] As a further embodiment of the present invention: a second switch door is slidably installed in the side opening, a second door lock mounting port is installed between the second switch door and the housing, a door lock is installed in the second door lock mounting port, and the second switch door and the housing are fixedly connected by the door lock, a handle is provided in the second switch door, and the second switch door is fixedly connected to the side slide plate.

[0011] As a further embodiment of the present invention: an air inlet is provided at the bottom front of the housing, a protective cover is slidably installed inside the air inlet, an air inlet hole is provided inside the protective cover, mounting screw holes are provided on both sides of the air inlet, and connecting seats are fixedly connected to both sides of the protective cover, and the connecting seats are fixedly connected to the mounting screw holes by bolts.

[0012] Compared with the prior art, the beneficial effects of the present invention are: convenient installation and maintenance: the present invention, through the sliding and removable side plate structure, can completely remove the circuit breaker from the enclosure for operation, providing a spacious and unobstructed working space, which greatly facilitates the installation, wiring, replacement and daily maintenance of the circuit breaker, eliminating the need to work in a narrow enclosure, and improving work efficiency and operational safety. Reliable connection and fixation: This invention employs a unique bolt connection hole (large upper hole, narrow lower groove) that mates with a pre-installed nut terminal block rail, allowing for quick and secure installation and locking through pressing and rotation. This mechanical and threaded dual locking mechanism ensures reliable connection, avoiding the instability issues caused by repeated drilling or insufficient tightening in traditional methods. Enhanced cable management and protection: This invention achieves flexible cable fixing and orderly wiring by setting up a keel chain plate, arc-shaped clamps, and mounting grooves. When the side slide is pulled out, the keel chain plate can adaptively retract and extend the cable, effectively avoiding cable detachment, wear, or loosening of connection points caused by rigid pulling, significantly improving the stability and safety of electrical connections; In summary, this invention not only solves the pain points of traditional distribution boxes, such as inconvenient installation and maintenance, easy pulling of cables, and insufficient protection, but also significantly improves the convenience of equipment operation, the reliability of connections, the stability of operation, and environmental adaptability, and has good practical value and promotion prospects. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a line protection device used in a distribution box according to the present invention.

[0014] Figure 2 This is a schematic diagram of the installation of a line protection device in a distribution box according to the present invention.

[0015] Figure 3 This is a schematic diagram of the structure of a line protection device in a distribution box during maintenance, as described in this invention.

[0016] Figure 4 This is a schematic diagram of the structure of a line protection device in a distribution box during daily use, as described in this invention.

[0017] Figure 5 This is a schematic diagram of the structure of the enclosure in a line protection device for an application in a distribution box according to the present invention.

[0018] Figure 6 This is a schematic diagram of the lower and upper frames of a line protection device used in a distribution box according to the present invention.

[0019] Figure 7 This is a schematic diagram of the upper protective cover in a line protection device used in a distribution box according to the present invention.

[0020] Figure 8 This is a schematic diagram of the keel chain plate in a line protection device used in a distribution box according to the present invention.

[0021] Figure 9This is a schematic diagram of the ground support column in a line protection device inside a distribution box according to the present invention.

[0022] Figure 10 This is a schematic diagram of the structure of a protective cover in a line protection device used in a distribution box according to the present invention.

[0023] Figure 11 This is a schematic diagram of the side sliding plate in a line protection device used in a distribution box according to the present invention.

[0024] Figure 12 This is a schematic diagram of the sliding connecting plate in a line protection device used in a distribution box according to the present invention.

[0025] In the diagram: 1-Box body, 2-Lower frame, 3-Upper frame, 4-Foot support column, 5-Lower support plate, 6-Upper protective cover, 7-Front opening, 8-First switch door, 9-First door lock mounting port, 10-Side opening, 11-Second switch door, 12-Second door lock mounting port, 13-Handle, 14-Air inlet, 15-Protective cover, 16-Connecting seat, 17-Mounting screw hole, 18-Air inlet, 19-Wiring port, 20-Fixing seat, 21-Keel chain plate, 22-Arc-shaped clip, 23-Mounting groove, 24-Rainproof edge, 25-Exhaust hole, 26-Fixing bracket, 27-Mounting seat, 28-Ball ball slide, 29-Sliding connecting plate, 30-Side sliding plate, 31-Terminal guide rail, 32-Bolt connection hole, 33-Mounting bolt, 34-Retrieval slot, 35-Circuit breaker. 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. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0027] In one embodiment, see [reference] Figures 1-12 A line protection device for use in a distribution box includes a box body 1, an upper frame 3, a lower support plate 5, an upper protective cover 6, a side slide plate 30, and a circuit breaker 35. The front of the box 1 is provided with a front opening 7, and the side of the box 1 is provided with a side opening 10; The housing 1 is provided with multiple sets of equally spaced fixing frames 26. Mounting seats 27 are slidably installed on both sides of the fixing frames 26. The mounting seats 27 are fastened to the inner wall of the housing 1 by bolts. The front of the fixing frame 26 is provided with a side slide plate 30. Multiple sets of sliding connecting plates 29 are fixedly connected to the back of the side slide plate 30. One end of the sliding connecting plate 29 is connected to the middle of the side slide plate 30, and the other end of the sliding connecting plate 29 extends beyond the side slide plate 30 to the outside of the side slide plate 30 to form an extension arm. The fixing frame 26 and the sliding connecting plate 29 are slidably connected by a ball bearing groove 28. The side slide plate 30 has multiple sets of equally spaced bolt connection holes 32 on both sides. The upper part of the bolt connection hole 32 is a large hole and the lower part is a narrow groove. The side slide plate 30 has multiple sets of terminal block rails 31. Nuts are fixedly connected to both ends of the terminal block rails 31. The mounting bolts 33 pass through the bolt connection holes 32 and are threaded to the nuts. The screw part of the mounting bolts 33 is then inserted into the narrow groove of the bolt connection holes 32. The large hole of the bolt connection holes 32 is clearance-fitted with the head of the mounting bolts 33. The terminal block rails 31 are then fixedly installed in the side slide plate 30. The circuit breaker 35 is fixedly installed on the terminal block rails 31. The bottom of one end of the terminal block rail 31 is provided with a notch, thereby forming a pick-and-place groove 34 on one side of the terminal block rail 31. The bottom of the pick-and-place groove 34 does not contact the buckle on the back of the circuit breaker 35, so that the circuit breaker 35 can be quickly removed after the buckle on the circuit breaker 35 is damaged. When the circuit breaker 35 needs to be installed, simply pull the side slide plate 30 out from the inside of the side opening 10. At this time, the side slide plate 30 is completely removed from the housing 1, while the extension arm of the sliding connecting plate 29 remains slidably connected to the fixing bracket 26. The fixing bracket 26 and the sliding connecting plate 29 support and fix the side slide plate 30. Then, the operator can thread the mounting bolt 33 into the nut at one end of the terminal block rail 31, insert the head of the bolt at one end of the terminal block rail 31 into the large hole at the top of the bolt connection hole 32, and then push the terminal block rail 31 down, thereby engaging the screw of the mounting bolt 33 into the narrow groove at the bottom of the bolt connection hole 32. Finally, the nut and the head of the screw align the terminal block... One end of the mounting rail 31 is clamped and fixed. Then, the bolt connection hole 32 of the other set of mounting bolts 33, which passes through the side slide plate 30, is threaded to the nut at the other end of the terminal mounting rail 31, thereby clamping and fixing the terminal mounting rail 31. Then, the circuit breaker 35 is fixedly installed on the terminal mounting rail 31. When the circuit breaker 35 needs to be removed, simply unscrew the mounting bolt 33 at one end of the terminal mounting rail 31, lift the other end, and pull it laterally. This will lift the head of the mounting bolt 33 out of the narrow groove of the bolt connection hole 32 and pull it out of the large hole of the bolt connection hole 32, thereby achieving quick removal of the terminal mounting rail 31 and avoiding repeated drilling inside the equipment. The present invention enables convenient installation and maintenance of the circuit breaker 35 on the outside of the enclosure 1 through the slidable and removable side slide plate 30 structure. The side slide plate 30 forms a sliding pair with the internal fixing frame 26 of the enclosure 1 through the sliding connecting plate 29 and the ball bearing groove 28 on its back. When the operator opens the second switch door 11 through the handle 13 and pulls out the side slide plate 30, the side slide plate 30 can be completely removed from the enclosure 1, while still remaining stable under the support of the sliding connecting plate 29, providing a reliable working position for external operation. The terminal block rail 31 enables quick installation through the engagement of pre-installed nuts at both ends with bolt connection holes 32. During installation, the head of the mounting bolt 33 is first inserted into the large-diameter area, and the rail is pressed down to make the shank of the mounting bolt 33 snap into the narrow groove. The threaded connection and structural limit are used to achieve fastening. This installation method is simple to operate and reliable in connection. The circuit breaker 35 is installed on the rail, and the pick-and-place slot 34 at the bottom provides emergency operating space for disassembly in case of damage to the circuit breaker 35 clip, thus improving maintenance efficiency.

[0028] In one instance of this embodiment, please refer to Figures 5-12The bottom of the housing 1 is riveted to a lower frame 2. A lower support plate 5 is set inside the lower frame 2. Multiple sets of foot support columns 4 are set on the top of the lower frame 2. The foot support columns 4, the lower frame 2, and the lower support plate 5 are fixedly connected by bolts. A wiring port 19 is provided inside the lower support plate 5. A fixing seat 20 is fixedly connected inside the wiring port 19. One end of a keel chain plate 21 is rotatably connected to the fixing seat 20. The other end of the keel chain plate 21 is rotatably connected to the side slide plate 30. An arc-shaped clip 22 is fixedly connected to the keel chain plate 21. The arc-shaped clip 22 has mounting grooves 23 on both sides. The cable passes through the wiring port 19 and is clamped and installed to the arc-shaped clip 22. The cable is bundled and secured to the keel chain plate 21 by passing the cable tie through the mounting groove 23, thereby limiting and fixing the cable. The cable is introduced through the wiring port 19 of the lower support plate 5, positioned by the arc-shaped clamp 22, and further fixed to the keel chain plate 21 by the cable tie and mounting groove 23. The two ends of the keel chain plate 21 are rotatably connected to the fixing seat 20 and the side slide plate 30, respectively. When the side slide plate 30 is pulled out, it drives the keel chain plate 21 to move, so that it adaptively retracts and extends the cable according to the pulling stroke, forming an effective guide and mechanical protection for the cable, avoiding cable detachment or loosening of connection points due to rigid pulling, and ensuring the continuous stability of the electrical connection.

[0029] In one instance of this embodiment, please refer to Figures 5-12 The top of the housing 1 is riveted to an upper frame 3, which has threaded holes at its top. An upper protective cover 6 is bolted to the upper frame 3. The upper protective cover 6 is designed to be higher in the front and lower in the back. Rainproof edges 24 are provided on the front and rear sides of the upper protective cover 6, with vent holes 25 at the bottom of the rainproof edges 24. An installation hole is provided on the top of the upper protective cover 6 to facilitate bolt installation. A sealing plug is installed in the installation hole to seal it. An air inlet 14 is provided at the bottom front of the housing 1, and a protective cover is slidably installed within the air inlet 14. The cover 15 has an air inlet 18 inside. The air inlet 14 has mounting screw holes 17 on both sides. The protective cover 15 is fixedly connected to the two sides of the protective cover 15. The connecting seat 16 and the mounting screw hole 17 are fixedly connected by bolts. In terms of the protection of the box 1, the upper protective cover 6 of the present invention adopts a front high and rear low structure and is equipped with a rain shield 24, which can effectively prevent rainwater from entering. The bottom exhaust hole 25 and the front air inlet 14 form convection to meet the heat dissipation requirements of the box. The protective cover 15 outside the air inlet 14 can be slidably adjusted and fixed, which plays a role in preventing dust and foreign objects.

[0030] In one instance of this embodiment, please refer to Figures 5-12A first switch door 8 is slidably installed in the front opening 7. A first lock mounting port 9 is installed between the first switch door 8 and the housing 1, and a lock is installed in the first lock mounting port 9. The lock then fixes the first switch door 8 to the housing 1. A second switch door 11 is slidably installed in the side opening 10. A second lock mounting port 12 is installed between the second switch door 11 and the housing 1, and a lock is installed in the second lock mounting port 12. The lock then fixes the second switch door 11 to the housing 1. A handle 13 is provided inside the second switch door 11. The second switch door 11 is fixedly connected to the side slide plate 30. This invention enhances the protection and safety of the overall device by providing switch doors with locks on the front and side of the housing 1. In addition, when the second switch door 11 is opened, it forms a protective layer on the outside of the side slide plate 30, thereby preventing external objects from directly colliding with the equipment on the side slide plate 30, further improving the safety of the equipment.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A line protection device applied in a distribution box, characterized in that, Includes enclosure, upper frame, lower support plate, upper protective cover, side slide plate, and circuit breaker; The front of the box is provided with a front opening, and the side of the box is provided with a side opening; The box is equipped with multiple sets of equally spaced fixing frames. Mounting seats are slidably installed on both sides of the fixing frames. The mounting seats are fastened to the inner wall of the box by bolts. The front of the fixing frame is equipped with a side slide plate. Multiple sets of sliding connecting plates are fixedly connected to the back of the side slide plate. One end of the sliding connecting plate is connected to the middle of the side slide plate, and the other end of the sliding connecting plate extends beyond the side slide plate to the outside of the side slide plate to form an extension arm. The fixing frame and the sliding connecting plate are slidably connected by ball bearing grooves. The side plate is provided with multiple sets of equally spaced bolt connection holes on both sides. The upper part of the bolt connection hole is a large hole and the lower part is a narrow groove. The side plate is provided with multiple sets of terminal block rails. Nuts are fixedly connected to both ends of the terminal block rails. The mounting bolt passes through the bolt connection hole and is threaded to the nut. Then, the threaded part of the mounting bolt is inserted into the narrow groove of the bolt connection hole. The large hole of the bolt connection hole is clearance-fitted with the head of the mounting bolt. Then, the terminal block rail is fixedly installed in the side plate. The circuit breaker is fixedly installed on the terminal block rail. When installing the circuit breaker, simply pull the side slide plate out from the inside of the side opening. At this point, the side slide plate is completely removed from the enclosure, while the extension arm of the sliding connecting plate remains slidably connected to the fixing bracket. The fixing bracket and the sliding connecting plate support and fix the side slide plate. Then, the operator can thread the mounting bolt into the nut at one end of the terminal block rail, insert the head of the bolt at the terminal block rail into the large hole at the top of the bolt connection hole, and then press the terminal block rail down, thereby engaging the bolt's threaded rod into the narrow groove at the bottom of the bolt connection hole. Finally, the nut and the bolt's head... The terminal block rail is secured by clamping one end, and then the bolts of the other set of mounting bolts, which pass through the bolt holes on the other side of the slide plate, are threaded into the nuts on the other end of the terminal block rail. This secures the terminal block rail. The circuit breaker is then fixedly installed onto the terminal block rail. When the circuit breaker needs to be removed, simply unscrew the mounting bolts at one end of the terminal block rail, lift the other end, and pull it laterally. This will lift the head of the mounting bolt from the narrow slot of the bolt hole and pull it out from the large hole, thus enabling quick removal of the terminal block rail.

2. The line protection device for use in a distribution box according to claim 1, characterized in that, The bottom of one end of the terminal block rail is provided with a notch, thereby forming a pick-and-place groove on one side of the terminal block rail. The bottom of the pick-and-place groove does not contact the buckle on the back of the circuit breaker.

3. The line protection device for use in a distribution box according to claim 1, characterized in that, The bottom of the enclosure is riveted to a lower frame, and the lower support plate is set inside the lower frame. Multiple sets of foot support columns are set on the top of the lower frame. The foot support columns, the lower frame, and the lower support plate are fixedly connected by bolts.

4. A line protection device for use in a distribution box according to claim 3, characterized in that, The lower support plate is provided with a wiring port, and a fixed base is fixedly connected to the wiring port. One end of the keel chain plate is rotatably connected to the fixed base, and the other end of the keel chain plate is rotatably connected to the side slide plate. An arc-shaped clamp is fixedly connected to the keel chain plate. The arc-shaped clamp is provided with mounting grooves on both sides. The cable passes through the wiring port and is clamped into the arc-shaped clamp. The cable tie is passed through the mounting groove and tied, thereby binding and fixing the cable to the keel chain plate, and limiting and fixing the cable.

5. A line protection device for use in a distribution box according to claim 1, characterized in that, The top of the box is riveted to an upper frame, which has threaded holes at the top. The upper protective cover is fixed to the upper frame with bolts. The upper protective cover is designed to be higher in the front and lower in the back. Rainproof edges are provided on the front and back sides of the upper protective cover, and vent holes are provided at the bottom of the rainproof edges.

6. A line protection device for use in a distribution box according to claim 1, characterized in that, A first switch door is slidably installed inside the front opening. A first door lock mounting hole is installed between the first switch door and the housing. A door lock is installed in the first door lock mounting hole, thereby fixing the first switch door and the housing together through the door lock.

7. A line protection device for use in a distribution box according to claim 1, characterized in that, A second switch door is slidably installed inside the side opening. A second door lock mounting hole is installed between the second switch door and the housing. A door lock is installed in the second door lock mounting hole, thereby fixing the second switch door and the housing together through the door lock. A handle is provided inside the second switch door, and the second switch door is fixedly connected to the side slide plate.

8. A line protection device for use in a distribution box according to claim 1, characterized in that, An air inlet is provided at the bottom front of the housing. A protective cover is slidably installed inside the air inlet. An air inlet hole is provided inside the protective cover. Mounting screw holes are provided on both sides of the air inlet. Connecting seats are fixedly connected to both sides of the protective cover. The connecting seats are fixedly connected to the mounting screw holes by bolts.

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