Circuit breaker with combined protection structure

Abstract

The invention provides a circuit breaker with a combined protection structure, and belongs to the technical field of circuit breakers, the circuit breaker comprises a circuit breaker body, the two ends of the circuit breaker body are provided with wiring ends, the circuit breaker body is connected with a control switch, the circuit breaker further comprises a fastening assembly, and the fastening assembly is used for locking a connecting wire; the unlocking assembly is used for unlocking the fastening assembly; the limiting assembly is used for limiting the position of the control switch; the circuit breaker has the beneficial effects that when the circuit breaker body is used, clamping and fixing of a wire can be completed through mutual cooperation of a pressing roller and a supporting roller, and when tripping occurs under the conditions of equipment overload or short circuit and the like, a push block lifts the pressing roller through an arc-shaped groove and a limiting clamping rod, so that limitation of the pressing roller and the supporting roller on the wire is relieved, and the service life of the circuit breaker body is prolonged. Therefore, the subsequent separation of the lead and the circuit breaker body is facilitated, the operation steps of maintenance and inspection are reduced, the control switch can be limited, and the protection effect is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a circuit breaker with a combined protection structure. Background Art

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and closing, carrying, and interrupting current under abnormal circuit conditions within a specified timeframe. It distributes electrical energy and protects power lines, automatically disconnecting the circuit in the event of a severe overload, short circuit, or undervoltage fault. Circuit breakers are categorized as high-voltage and low-voltage based on their scope of use. The distinction between high and low voltage is vague, with those above 3kV generally considered high-voltage electrical appliances. Circuit breakers are used to distribute electrical energy, infrequently start asynchronous motors, and protect power lines and motors. They automatically disconnect the circuit in the event of a severe overload, short circuit, or undervoltage fault. Their functionality is equivalent to a combination of a fuse switch and an over / undertemperature relay, and interrupting the fault current generally requires no component changes. Currently, they are widely used.

[0003] A circuit breaker is generally constructed by removing the insulation layer of the terminal of a wire to expose the conductor inside the wire, and then inserting the conductor into the hole of the circuit breaker and fixing it with screws. However, in the prior art, in order to prevent the wire from falling off due to vibration or other reasons after being fixed with bolts, a limiting mechanism is usually installed on one side of the circuit breaker to further fix the wire and increase the stability of the wire connection. However, the wire clamping and limiting mechanism of some circuit breakers usually requires the use of multiple tools during installation, and the operation steps are complicated, which not only increases the difficulty of wire installation, but also prolongs the installation time. In addition, in some electrical equipment, the installation location of the circuit breaker may be relatively compact, resulting in limited operating space for operators when clamping and limiting the wire, making it inconvenient for quick maintenance and disassembly, and difficult to complete the operation smoothly. How to invent a circuit breaker with a combined protective structure to solve these problems has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] In order to overcome the above shortcomings, the present invention provides a circuit breaker with a combined protection structure, which aims to solve the problems of complicated operation steps, increased difficulty in installing wires, and limited operating space when the installation position of the circuit breaker is relatively compact, making it difficult to complete the operation smoothly.

[0005] The present invention is achieved in that: The present invention provides a circuit breaker with a combined protection structure, comprising a circuit breaker body, two ends of the circuit breaker body are provided with connection terminals, the circuit breaker body is connected to a control switch, and further comprising: A fastening assembly, the fastening assembly being located inside the terminal and being used to lock the connecting wire; An unlocking assembly, connected to the terminal, and used to unlock the fastening assembly; A limit assembly is fixedly connected to the control switch and is used to limit the position of the control switch.

[0006] Preferably, the circuit breaker body is fixedly connected to the wiring terminal, the side wall of the circuit breaker body is fixedly connected to the limit frame, a fixed cavity is provided inside the wiring terminal, a movable slot is provided at one end of the fixed cavity, a groove is provided on one inner wall of the fixed cavity, a wiring hole is provided on the inner wall of the end of the fixed cavity away from the groove, and a fixing bolt is threadedly connected to the side wall of the wiring terminal.

[0007] Preferably, a conductive sheet and a connecting seat are fixedly connected to the inner wall of the fixed cavity, the conductive sheet and the connecting seat are slidably connected, and the conductive sheet is located below the fixing bolt.

[0008] Preferably, the fastening assembly includes a fixed plate, a pressure roller and a support roller, the fixed plate is fixedly connected to the inner wall of the fixed cavity, one side of the fixed plate is fixedly connected to a fixed rod, and the end of the fixed rod away from the fixed plate is rotatably connected to a movable plate.

[0009] Preferably, a torsion spring is sleeved on the outer wall of the fixed rod, and the two ends of the torsion spring are respectively fixedly connected to the side walls of the corresponding movable plate. The end of the movable plate away from the fixed rod is rotatably connected to the pressure roller, and the outer wall of the pressure roller is fixedly connected to a number of protective strips distributed in a circumferential array.

[0010] Preferably, the support roller is located below the pressure roller, the two ends of the support roller are rotatably connected to the inner wall of the fixed cavity, the outer wall of the support roller is fixedly connected with several groups of convex balls distributed in a circumferential array, the support roller and the pressure roller are both located on one side of the connecting seat, and the convex balls are elastic.

[0011] Preferably, the unlocking assembly includes a limiting card rod and a push rod, the side wall of the limiting card rod is slidably connected to the inner wall of the movable slot, and the limiting card rod is slidably connected to the limiting frame.

[0012] Preferably, one end of the limiting rod located inside the fixed cavity is fixedly connected to the push rod, one end side wall of the limiting rod is fixedly connected to a return spring, and the end of the return spring away from the limiting rod is fixedly connected to the inner wall of the groove.

[0013] Preferably, the push rod is fixedly connected to a push block at one end away from the limiting clamping rod, and the push block is arranged in a step-shaped manner. The side wall of one end of the push block can be slidably connected to the clamping roller, and the push rod and the push block are located on one side of the connecting seat.

[0014] Preferably, the limit assembly includes a rotating disk, one end of the rotating disk is fixedly connected to the control switch, the side wall of the rotating disk is provided with an arc groove, the outer wall of the rotating disk is provided with a limit groove adapted to the limit rod, the limit groove is located on one side of the arc groove, the center line of the limit groove and the center line of the limit rod away from the fixed cavity are located on the same horizontal plane, and the inner wall of the arc groove is slidably connected to one end of the limit rod.

[0015] The beneficial effects of the present invention are: 1. When using the circuit breaker body, the limit card rod can be pushed to make the reset spring continue to stretch. When one end of the limit card rod is separated from the limit slot, the control switch can be turned to push it to the open state. In this process, due to the rotation of the control switch and the elastic recovery of the reset spring, the limit card rod can be driven to return to its position and inserted into the deepest part of the arc slot. At this time, the push block no longer applies external force to the clamping roller. Through the elastic recovery of the torsion spring and the rotation connection between the movable plate and the fixed rod, the clamping roller can be moved down and cooperated with the support roller to complete the clamping and fixing of the wire. Not only that, when the breaker is After the circuit breaker body trips due to overload or short circuit, during the process of resetting the control switch, the arc groove will gradually squeeze the limit card rod, causing the limit card rod to stretch the reset spring and drive the push block to move toward the wiring hole through the push rod. At the same time, the push block inclined surface and the clamping roller slide against each other, thereby lifting the clamping roller. The rotation of the movable plate causes the torsion spring to deform, thereby releasing the restriction of the clamping roller and the support roller on the wire, making it easier to quickly separate the wire from the circuit breaker body after loosening the fixing bolts. This reduces the number of maintenance and inspection steps, improves efficiency, and facilitates smooth completion of the operation.

[0016] 2. During the resetting process of the control switch, after one end of the limit card rod is separated from the arc groove, the control switch has not been completely reset. As the control switch rotates during the resetting process, one end of the limit card rod will first slide against the outer wall of the rotating disk. When the control switch finishes rotating, the limit groove is located on one side of the limit card rod. At this moment, the limit card rod is no longer squeezed by external force, and the elastic recovery of the reset spring causes the limit card rod to move toward the side of the limit groove, and finally one end of the limit card rod is inserted into the inside of the limit groove, thereby completing the limiting of the control switch, avoiding the operator accidentally touching and opening the control switch during maintenance and inspection, causing reconnection of the line, and further enhancing the protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure of a circuit breaker with a combined protection structure provided by an embodiment of the present invention; Figure 2 This is a schematic structural diagram of a limit assembly of a circuit breaker with a combined protection structure provided by an embodiment of the present invention; Figure 3 A circuit breaker with a combined protection structure provided by an embodiment of the present invention Figure 2 A schematic diagram of the structure at center A; Figure 4 This is a schematic diagram of the connection end structure of a circuit breaker with a combined protection structure provided by an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of a fixed cavity of a circuit breaker with a combined protection structure provided by an embodiment of the present invention; Figure 6 This is a schematic structural diagram of an unlocking assembly of a circuit breaker with a combined protection structure provided by an embodiment of the present invention; Figure 7 This is a schematic diagram of a half-section structure of a connection end of a circuit breaker with a combined protection structure provided by an embodiment of the present invention; Figure 8 This is a schematic structural diagram of a fastening assembly of a circuit breaker with a combined protection structure provided by an embodiment of the present invention; Figure 9 The figure is a schematic diagram of a control switch reset structure of a circuit breaker with a combined protection structure provided by an embodiment of the present invention.

[0019] In the figure: 1. Wiring terminal; 101. Movable slot hole; 102. Wiring hole; 103. Fixed cavity; 1031. Groove; 2. Fixing bolt; 3. Unlocking assembly; 31. Limiting lever; 32. Reset spring; 33. Push rod; 34. Push block; 4. Limiting frame; 5. Control switch; 6. Limiting assembly; 61. Rotating disk; 62. Limiting slot; 63. Arc slot; 7. Circuit breaker body; 8. Conductive plate; 9. Fastening assembly; 91. Fixed plate; 911. Torsion spring; 912. Fixed rod; 913. Movable plate; 92. Pressure roller; 921. Protective strip; 93. Support roller; 931. Protruding ball; 10. Connecting seat. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0021] Example 1, refer to Figures 1-9 A circuit breaker with a combined protection structure includes a circuit breaker body 7, two ends of the circuit breaker body 7 are provided with terminal 1, the circuit breaker body 7 is connected to a control switch 5, and further includes: A fastening assembly 9, which is located inside the terminal 1 and is used to lock the connecting wire; Unlocking component 3, unlocking component 3 is connected to terminal 1, and is used to unlock fastening component 9; The limit assembly 6 is fixedly connected to the control switch 5 and is used to limit the position of the control switch 5.

[0022] Furthermore, the circuit breaker body 7 is fixedly connected to the terminal 1, the side wall of the circuit breaker body 7 is fixedly connected to the limit frame 4, a fixed cavity 103 is provided inside the terminal 1, a movable slot 101 is provided at one end of the fixed cavity 103, a groove 1031 is provided on the inner wall of one side of the fixed cavity 103, and a wiring hole 102 is provided on the inner wall of the fixed cavity 103 away from the groove 1031, and a fixing bolt 2 is threadedly connected to the side wall of the terminal 1; the inner wall of the fixed cavity 103 is fixedly connected to the conductive voltage plate 8 and the connecting seat 10, and the conductive voltage plate 8 is slidably connected to the connecting seat 10, and the conductive voltage plate 8 is located below the fixing bolt 2; the fastening assembly 9 includes a fixing plate 91, a pressing roller 92 and a supporting roller 93, and the fixing plate 91 is fixedly connected to the inner wall of the fixed cavity 103, fixed One side of the fixed plate 91 is fixedly connected to a fixed rod 912, and the end of the fixed rod 912 away from the fixed plate 91 is rotatably connected to a movable plate 913; the outer wall of the fixed rod 912 is sleeved with a torsion spring 911, and the two ends of the torsion spring 911 are respectively fixedly connected to the side walls of the corresponding movable plate 913, and the end of the movable plate 913 away from the fixed rod 912 is rotatably connected to the pressure roller 92, and the outer wall of the pressure roller 92 is fixedly connected to several protective strips 921 distributed in a circumferential array; the support roller 93 is located below the pressure roller 92, and the two ends of the support roller 93 are rotatably connected to the inner wall of the fixed cavity 103, and the outer wall of the support roller 93 is fixedly connected to several groups of convex balls 931 distributed in a circumferential array. The support roller 93 and the pressure roller 92 are both located on one side of the connecting seat 10, and the convex balls 931 are elastic.

[0023] The fastening assembly 9 positions the wire: in the initial state, the limit groove 62 on the rotating disk 61 is engaged with one end of the limit clamping rod 31. At this time, the return spring 32 is in a stretched state, and the limit clamping rod 31 is no longer close to one end of the movable slot 101, and is also at a certain distance from the other end of the movable slot 101. At this moment, the push rod 33 drives the push block 34 to lift the pressing roller 92. When connecting the wire, first, one end of the wire can be inserted into the interior of the fixed cavity 103 through the wiring hole 102, and then pass through the gap between the pressing roller 92 and the supporting roller 93. After that, the wire is inserted between the conductive voltage plate 8 and the connecting seat 10, and then the fixing bolt 2 is rotated to squeeze one end of the fixing bolt 2 The conductive voltage plate 8 is pressed down and contacts with the wire, thereby completing the preliminary fixation of the wire and completing the connection between the wire and the circuit breaker body 7. The conductive voltage plate 8 has a certain elasticity and is an existing technology inside the circuit breaker body 7; When the circuit breaker body 7 is in use, the limit card rod 31 can be pushed to move one end of the limit card rod 31 continuously inside the movable slot 101. At the same time, the return spring 32 is continuously stretched. When one end of the limit card rod 31 is separated from the limit slot 62, the control switch 5 can be rotated to push it to the open state. In this process, due to the rotation of the control switch 5 and the elastic recovery of the return spring 32, the limit card rod 31 can be driven to return to its position and the limit card rod 31 can be inserted into the deepest part of the arc slot 63. At this time, the push block 34 no longer applies external force to the clamping roller 92. Through the elastic recovery of the torsion spring 911 and the rotation connection between the movable plate 913 and the fixed rod 912, the clamping roller 92 can be moved downward, and at the same time, the support roller 93 is cooperated to complete the clamping and fixing of the wire. , and there is a certain angle between the pressing roller 92 and the inner wall of one side of the fixed cavity 103. When the pressing roller 92 is not squeezed by the push block 34, the distance between the pressing roller 92 and the support roller 93 is smaller than the outer diameter of the wire. Therefore, when the wire moves outward, the mutual clamping between the pressing roller 92 and the support roller 93 can effectively prevent the wire from being separated from the terminal 1, and the protective strip 921 on the surface of the pressing roller 92 can be made of rubber material, which can not only protect the surface of the wire and avoid damage to the wire during the clamping process, but also increase the friction between it and the wire, thereby increasing the fastening degree of the wire. Through the above operation, it can effectively prevent the conductive voltage plate 8 from no longer pressing the wire after the fixing bolt 2 is loosened, thereby causing the wire to be separated from the circuit breaker body 7.

[0024] The protruding balls 931 stabilize the connection between the conductor and the conductive plate 8. Furthermore, the pressure roller 92 and the support roller 93 are both made of insulating materials, while the protruding balls 931 on the surface of the support roller 93 can be made of materials such as rubber or plastic (but not limited thereto) to ensure that the protruding balls 931 have a certain degree of elasticity and insulating effect. The outer wall of the uppermost end of the support roller 93 is higher than one end of the connecting seat 10. Therefore, during the process of clamping the conductor by the pressure roller 92 and the support roller 93, the tightening of the fixing bolt 2 can cause the conductive plate 8 to move the conductor downward, causing the conductor to squeeze the protruding balls 931, causing the protruding balls 931 to be compressed to a certain extent. However, if the fixing bolt 2 becomes loose during use, the pressure applied by the conductive plate 8 on the conductor will be weakened. At this time, the elastic recovery of the protruding balls 931 can drive the conductor upward a certain distance. Not only that, the protruding balls 931 can also increase the friction between the conductor and the conductive plate 8, thereby effectively increasing the firmness of the conductor after connection, thereby ensuring that the end of the conductor is in continuous contact with the conductive plate 8, thereby ensuring the stability of the connection between the conductor and the circuit breaker body 7.

[0025] Reference Figure 5-Figure 7 When the cam 31 is in the unlocking state, the locking cam 33 is unlocked and the unlocking assembly 3 includes a limit rod 31 and a push rod 33. The side wall of the limit rod 31 is slidably connected to the inner wall of the movable slot 101, and the limit rod 31 is slidably connected to the limit frame 4; one end of the limit rod 31 inside the fixed cavity 103 is fixedly connected to the push rod 33, and the side wall of one end of the limit rod 31 is fixedly connected to the return spring 32, and the end of the return spring 32 away from the limit rod 31 is fixedly connected to the inner wall of the groove 1031; the end of the push rod 33 away from the limit rod 31 is fixedly connected to the push block 34, and the push block 34 is arranged in a step-like shape, and the side wall of one end of the push block 34 can be slidably connected to the pressure roller 92, and the push rod 33 and the push block 34 are located on one side of the connecting seat 10.

[0026] Unlock the looseness of the wires of component 3: Figure 1As shown, when the circuit breaker body 7 is in use, the control switch 5 is in the open position. However, when the circuit breaker body 7 trips due to overload or short circuit, this is a prior art and the specific reasons are not described. At this time, during the resetting process of the control switch 5, the arc groove 63 gradually squeezes the limit card rod 31, causing the limit card rod 31 to stretch the reset spring 32 and drive the push block 34 to move toward the wiring hole 102 through the push rod 33. At the same time, the push block 34 slides with the pressing roller 92, thereby lifting the pressing roller 92. The rotation of the movable plate 913 causes the torsion spring 911 to deform, so that the reset spring 32 is released. This releases the restriction of the pressure roller 92 and the support roller 93 on the wire, making it easier to quickly separate the wire from the circuit breaker body 7 after loosening the fixing bolt 2, reducing the operating steps of maintenance and inspection and improving efficiency. Therefore, when the circuit breaker body 7 or the wire needs to be repaired or replaced, the disassembly process of the clamping and limiting mechanism of the wire is no longer cumbersome, and there is no need to remove multiple parts to remove the wire, which reduces the difficulty and time cost of maintenance. In addition, in order to avoid shaking of the limit card rod 31 during movement, the limit frame 4 can increase its stability and prevent the limit card rod 31 from deflecting.

[0027] Example 2, refer to Figure 1-Figure 3 , further; the limit assembly 6 includes a rotating disk 61, one end of the rotating disk 61 is fixedly connected to the control switch 5, an arc-shaped groove 63 is provided on the side wall of the rotating disk 61, and a limit groove 62 adapted to the limit card rod 31 is provided on the outer wall of the rotating disk 61, the limit groove 62 is located on one side of the arc-shaped groove 63, and the center line of the limit groove 62 and the center line of the end of the limit card rod 31 away from the fixed cavity 103 are located on the same horizontal plane, and the inner wall of the arc-shaped groove 63 is slidably connected to one end of the limit card rod 31.

[0028] The limit assembly 6 positions the control switch 5: during the resetting process of the control switch 5, after one end of the limit card rod 31 is separated from the arc groove 63, the control switch 5 has not yet been fully reset, and as the control switch 5 rotates during the resetting process, one end of the limit card rod 31 will first slide against the outer wall of the rotating disk 61. When the control switch 5 finishes rotating, the limit groove 62 is located on one side of the limit card rod 31. At this moment, the limit card rod 31 is no longer squeezed by the external force, and the elastic recovery of the reset spring 32 causes the limit card rod 31 to move toward the side of the limit groove 62, and finally causes one end of the limit card rod 31 to be inserted into the interior of the limit groove 62, thereby completing the limiting of the control switch 5, avoiding the operator from accidentally touching and opening the control switch 5 during maintenance and inspection, causing the line to be reconnected, further enhancing the protection effect, and through this linkage method, not only solves the problem of inconvenient disassembly and difficult maintenance, but also increases the safety of equipment use, thereby effectively enhancing the combined protection effect of the circuit breaker body 7.

[0029] It should be noted that the specific model specifications need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0030] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A circuit breaker with a combined protection structure, comprising a circuit breaker body (7), wherein both ends of the circuit breaker body (7) are provided with connection terminals (1), and the circuit breaker body (7) is connected to a control switch (5), characterized in that: Also includes: A fastening assembly (9), the fastening assembly (9) being located inside the terminal (1), and the fastening assembly (9) being used to lock the connecting wire; An unlocking component (3), the unlocking component (3) being connected to the terminal (1), and the unlocking component (3) being used to unlock the fastening component (9); A limit assembly (6), wherein the limit assembly (6) is fixedly connected to the control switch (5), and the limit assembly (6) is used to limit the position of the control switch (5).

2. A circuit breaker with a combined protection structure according to claim 1, characterized in that: The circuit breaker body (7) is fixedly connected to the terminal (1), the side wall of the circuit breaker body (7) is fixedly connected to the limit frame (4), a fixed cavity (103) is provided inside the terminal (1), a movable slot (101) is provided at one end of the fixed cavity (103), a groove (1031) is provided on one side inner wall of the fixed cavity (103), a wiring hole (102) is provided on the inner wall of one end of the fixed cavity (103) away from the groove (1031), and a fixing bolt (2) is threadedly connected to the side wall of the terminal (1).

3. The circuit breaker with a combined protection structure according to claim 2, characterized in that: A conductive sheet (8) and a connecting seat (10) are fixedly connected to the inner wall of the fixed cavity (103), the conductive sheet (8) and the connecting seat (10) are slidably connected, and the conductive sheet (8) is located below the fixing bolt (2).

4. The circuit breaker with a combined protection structure according to claim 3, characterized in that: The fastening assembly (9) comprises a fixed plate (91), a pressing roller (92) and a supporting roller (93); the fixed plate (91) is fixedly connected to the inner wall of the fixed cavity (103); a fixed rod (912) is fixedly connected to one side of the fixed plate (91); and an end of the fixed rod (912) away from the fixed plate (91) is rotatably connected to a movable plate (913).

5. The circuit breaker with a combined protection structure according to claim 4, characterized in that: The outer wall of the fixed rod (912) is sleeved with a torsion spring (911), and the two ends of the torsion spring (911) are respectively fixedly connected to the side walls of the corresponding movable plate (913). The end of the movable plate (913) away from the fixed rod (912) is rotatably connected to the clamping roller (92), and the outer wall of the clamping roller (92) is fixedly connected to a plurality of protective strips (921) distributed in a circumferential array.

6. The circuit breaker with a combined protection structure according to claim 5, characterized in that: The support roller (93) is located below the pressing roller (92), and both ends of the support roller (93) are rotatably connected to the inner wall of the fixed cavity (103). The outer wall of the support roller (93) is fixedly connected with a plurality of groups of convex balls (931) distributed in a circumferential array. The support roller (93) and the pressing roller (92) are both located on one side of the connecting seat (10), and the convex balls (931) are elastic.

7. The circuit breaker with a combined protection structure according to claim 3, characterized in that: The unlocking assembly (3) comprises a limiting card rod (31) and a push rod (33), the side wall of the limiting card rod (31) is slidably connected to the inner wall of the movable slot (101), and the limiting card rod (31) is slidably connected to the limiting frame (4).

8. The circuit breaker with a combined protection structure according to claim 7, characterized in that: One end of the limiting clamping rod (31) located inside the fixed cavity (103) is fixedly connected to the push rod (33), and one end side wall of the limiting clamping rod (31) is fixedly connected to a return spring (32), and one end of the return spring (32) away from the limiting clamping rod (31) is fixedly connected to the inner wall of the groove (1031).

9. The circuit breaker with a combined protection structure according to claim 8, characterized in that: One end of the push rod (33) away from the limiting clamping rod (31) is fixedly connected to a push block (34), and the push block (34) is arranged in a step-shaped manner. One end side wall of the push block (34) can be slidably connected to the pressing roller (92), and the push rod (33) and the push block (34) are located on one side of the connecting seat (10).

10. The circuit breaker with a combined protection structure according to claim 7, characterized in that: The limit assembly (6) includes a rotating disk (61), one end of the rotating disk (61) is fixedly connected to the control switch (5), a side wall of the rotating disk (61) is provided with an arc-shaped groove (63), an outer wall of the rotating disk (61) is provided with a limit groove (62) adapted to the limit clamping rod (31), the limit groove (62) is located on one side of the arc-shaped groove (63), a center line of the limit groove (62) and a center line of an end of the limit clamping rod (31) away from the fixed cavity (103) are located on the same horizontal plane, and an inner wall of the arc-shaped groove (63) is slidably connected to one end of the limit clamping rod (31).

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