A backup protection device for circuit breaker

Abstract

The backup protection device of a circuit breaker provided by the present invention comprises: a base; a plurality of static iron cores arranged at intervals inside the base; a transmission rod assembly, comprising a traction shaft; an operating mechanism, comprising an operating rod; a traction rod assembly, comprising a traction rod, and a moving iron core arranged on the traction rod and corresponding to the plurality of static iron cores, one end of the traction shaft is linked to the traction rod, and the other end is linked to the operating rod, the traction shaft is slidably arranged along the height direction of the circuit breaker, and can drive the operating rod to rotate. The backup protection device of the circuit breaker can overcome the defects of the backup protection release in the prior art that the number of parts is large and the assembly work is relatively cumbersome.

Description

Technical Field

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

[0002] The backup protection device of the molded case circuit breaker can drive the operating mechanism to cut off the circuit in the event of overload, short circuit and electronic release failure, thereby protecting electrical equipment and personnel safety.

[0003] In the utility model patent with patent announcement number CN219226180U, a backup protection structure of an electronic circuit breaker is disclosed, including a base, a traction rod and three-phase partition slots A, B, and C arranged in sequence on the base, and backup protection releasers are respectively installed in the three-phase partition slots A, B, and C. Each backup protection includes a yoke, a movable armature, a U-shaped bracket, a spring structure and a trigger structure. During the assembly of the backup protection releaser, the lower end of the U-shaped bracket is connected to the yoke, and the movable armature is hinged to the upper end of the U-shaped bracket through a pin shaft. The spring structure is sleeved on the pin shaft, and its two ends extend to abut the movable armature and the U-shaped bracket respectively. After the assembly is completed, the yoke is fixed to the conductive plate of the base by screws. The above-mentioned backup protection releaser has a large number of parts and components, and the assembly process is relatively cumbersome. In addition, there are three backup protection releasers, which further increases the production cost. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the backup protection release in the prior art that the number of parts is large and the assembly work is complicated, so as to provide a backup protection device for the circuit breaker that is easy to install.

[0005] To this end, the present invention provides a backup protection device for a circuit breaker, comprising: a base; a plurality of static iron cores arranged at intervals inside the base; a transmission rod assembly, comprising a traction shaft; an operating mechanism, comprising an operating rod; a traction rod assembly, comprising a traction rod, and a moving iron core arranged on the traction rod and corresponding to the plurality of static iron cores, one end of the traction shaft is linked to the traction rod, and the other end is linked to the operating rod, the traction shaft is slidably arranged along the height direction of the circuit breaker, and can drive the operating rod to rotate.

[0006] Furthermore: the operating mechanism also includes an extension rod located on the operating rod, the operating rod is provided with a first extension block that can contact the upper end of the traction shaft, the traction rod is provided with a second extension block that contacts the lower end of the traction shaft, one end of the traction shaft is linked to the first extension block, and the other end is linked to the second extension block, the operating rod is arranged parallel to the traction rod and the traction shaft is arranged vertically between the two, and the outside of the traction shaft is provided with a positioning block for assisting the vertical movement of the traction shaft.

[0007] Further: it also includes a transformer housing, which is arranged inside the base, the positioning block is arranged on the transformer housing or the base, the positioning block is provided with a through slot for the traction shaft to pass through, the traction rod is provided with an abutment plate, the abutment plate can abut against the base, the traction rod has a first position in which the moving iron core is in a short-circuit state and a second position in which the moving iron core is in a normal state, and when the traction rod is in the second position, the abutment plate abuts against the base.

[0008] Furthermore: the static iron core is arranged in an inverted U shape, and the base or the transformer housing is also provided with a limit groove for the static iron core to be installed, the transformer housing is provided with a fastening nail, and the connection between the fastening nail and the transformer housing is provided with an anti-drop gasket for preventing the static iron core from falling out.

[0009] Furthermore: a slot is arranged on the bottom wall of the limiting groove, an insert block inserted into the slot is arranged on the static iron core, and a partition plate for separating the adjacent static iron cores is arranged between the two.

[0010] Furthermore: a plurality of receiving grooves for inserting the moving iron core are arranged in the traction rod, and a clamping structure for clamping the moving iron core in the receiving groove is arranged between the moving iron core and the receiving groove, and the clamping structure includes a clamping block arranged on one side of the moving iron core or the side wall of the receiving groove and a clamping groove arranged on the other side and matched with the clamping block.

[0011] Furthermore: a return spring is hooked on the traction rod, and the return spring is hooked on the base at a side facing away from the traction rod.

[0012] Further: a plurality of conductive sheets are arranged on the base, the conductive sheets include a conductive sheet body, a contact end arranged at one end of the conductive sheet body and a positioning end arranged at the other end, the contact end is inserted into the static iron core, and the positioning end is connected to the base by screws.

[0013] Furthermore: the traction rod is injection molded, and a bottom cover for locating the position of the traction rod is provided at the bottom of the traction rod.

[0014] Furthermore: a reinforcing needle is arranged inside the traction rod to prevent the traction rod from deforming.

[0015] The technical solution of the present invention has the following advantages:

[0016] 1. The backup protection device of a circuit breaker provided by the present invention, during assembly, firstly install a plurality of static iron cores in a base, then fix the operating mechanism, then fix the traction shaft on the base, then install a plurality of moving iron cores on the same traction rod to form a traction rod assembly, and then install the entire traction rod assembly into the base, thereby completing the installation of the backup protection structure part. Compared with the prior art, the number of parts is small, the assembly process is relatively simple, and the production cost is greatly reduced.

[0017] 2. The present invention provides a backup protection device for a circuit breaker. When the magnetic field between the moving iron core and the stationary iron core is enhanced, the moving iron core will rotate and engage with the stationary iron core, and the traction rod will rotate, so that the second extension block will push the traction shaft to move upward, and the upper position of the traction shaft will hit the first extension block, thereby driving the operating rod to rotate, driving the operating mechanism to move, and finally causing the releaser to trip.

[0018] 3. A backup protection device for a circuit breaker provided by the present invention has a positioning block on the transformer housing or base to assist in the movement of the traction shaft. A slot is provided in the positioning block for the traction shaft to pass through. When the moving iron core switches from the second position to the first position, the traction shaft moves upward, thereby driving the operating mechanism to move and causing the releaser to trip. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is the overall structural diagram of the circuit breaker;

[0021] Figure 2 It is a schematic diagram of the structure of the backup protection device in the circuit breaker;

[0022] Figure 3 It is a structural schematic diagram of another embodiment of a backup protection device in a circuit breaker;

[0023] Figure 4 is a schematic diagram of the cross-sectional structure of a circuit breaker;

[0024] Figure 5 It is a structural schematic diagram of another embodiment of a backup protection device in a circuit breaker;

[0025] Figure 6 A diagram showing the position of the conductive sheet in the backup protection device;

[0026] Figure 7is a position relationship diagram of another angle of the conductive sheet in the backup protection device;

[0027] Figure 8 is another cross-sectional structural schematic diagram of the circuit breaker;

[0028] Fig. 9 is another structural schematic diagram of the backup protection device in the circuit breaker;

[0029] Fig.10 It is a schematic diagram of the cross-sectional structure between the static iron core and the transformer housing;

[0030] Fig.11 It is a schematic diagram of the cross-sectional structure between the moving iron core and the traction rod;

[0031] Fig.12 This is a diagram showing the position relationship between the return spring and the traction rod.

[0032] Description of reference numerals:

[0033] 1. Base; 11. Operating mechanism; 2. Avoidance groove; 3. Static iron core; 30. Partition plate; 4. Conductive sheet; 41. Main body; 42. Contact end; 43. Positioning end; 44. Screw; 5. Drawbar assembly; 51. Drawbar; 52. Moving iron core; 53. Reinforcement needle; 6. Transmission rod assembly; 61. Drawbar shaft; 62. Operating rod; 63. First extension block; 64. Second extension block; 7. Transformer housing; 71. Positioning block; 72. Through groove; 73. Limit pin; 731. Abutment plate; 74. Limit groove; 75. Fastening nail; 750. Anti-drop gasket; 76. Insert block; 77. Slot; 8. Extension rod; 9. Accommodating groove; 91. Snap block; 92. Snap groove; 93. Guide slope; 94. Reset spring; 95. Bottom cover; 96. Card wheel; 97. Extension plate; 98. Isolation sheet. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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 creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Example

[0039] The present embodiment provides a backup protection device for a circuit breaker, comprising: a base 1; a plurality of static iron cores 3, which are arranged at intervals inside the base 1; a transmission rod assembly 6, comprising a traction shaft 61; an operating mechanism 11, comprising an operating rod 62; a traction rod assembly 5, comprising a traction rod 51, and a movable iron core 52 arranged on the traction rod 51 and corresponding to the plurality of static iron cores 3, wherein one end of the traction shaft 61 is linked to the traction rod 51, and the other end is linked to the operating rod 62, and the traction shaft 61 is slidably arranged along the height direction of the circuit breaker and can drive the operating rod 62 to rotate.

[0040] The above specific improvements are: Figure 1-Figure 5 As shown, compared with the prior art, during assembly, a plurality of static iron cores 3 are first installed in the base 1, then the operating mechanism 11 is fixed, and then the traction shaft 61 is fixed on the base 1, and then a plurality of moving iron cores 52 are installed on the same traction rod 51 to form a traction rod assembly 5, and then the entire traction rod assembly 5 is installed in the base 1, thereby completing the installation of the backup protection structure part. Compared with the prior art, this method has a small number of parts and components, a relatively simple assembly process, and greatly reduces the production cost.

[0041] On the basis of the above embodiment: the operating mechanism 11 also includes an extension rod 8 located on the operating rod 62, the operating rod 62 is provided with a first extension block 63 that can contact the upper end of the traction shaft 61, and the traction rod 51 is provided with a second extension block 64 that contacts the lower end of the traction shaft 61, one end of the traction shaft 61 is linked to the first extension block 63, and the other end is linked to the second extension block 64, the operating rod 62 is arranged parallel to the traction rod 51 and the traction shaft 61 is vertically arranged therebetween, and the outside of the traction shaft 61 is provided with a positioning block 71 for assisting the vertical movement of the traction shaft 61.

[0042] The above specific improvements are: Figure 4 As shown, when the magnetic force between the moving iron core 52 and the static iron core 3 is enhanced, the moving iron core 52 will rotate and be attracted to the static iron core 3. The rotation of the moving iron core 52 drives the traction rod 51 to rotate, and the second extension block 64 on the traction rod 51 hits the traction shaft 61, so that the second extension block 64 will push the traction shaft 61 to move upward, and the upper position of the traction shaft 61 will hit the first extension block 63, thereby driving the operating rod 62 to rotate, and the operating rod 62 will drive the extension rod 8 to rotate, thereby driving the releaser to release (the structure of the releaser is the prior art and is common knowledge known to technicians in the field, and will not be described in detail here). By setting the linkage relationship among the traction rod 51, the traction shaft 61 and the operating rod 62, the action of the operating mechanism 11 can be realized with relatively less space and material, driving the releaser to release, and by setting the positioning block 71, the lateral movement of the traction shaft 61 can be limited, so that the traction shaft 61 only maintains vertical movement.

[0043] On the basis of the above embodiment: it also includes a transformer housing 7, the transformer housing 7 is arranged inside the base 1, the positioning block 71 is arranged on the transformer housing 7 or the base 1, the positioning block 71 is provided with a through slot 72 for the traction shaft 61 to pass through, the traction rod 51 is provided with an abutment plate 731, the abutment plate 731 can abut against the base 1, the traction rod 51 has a first position in which the moving iron core 52 is in a short-circuit state and a second position in which the moving iron core 52 is in a normal state, and when the traction rod 51 is in the second position, the abutment plate 731 abuts against the base 1.

[0044] The above specific improvements are:

[0045] Embodiment 1:

[0046] like Figure 2As shown, the positioning block 71 is arranged on the transformer housing 7, and a through slot 72 is opened on the positioning block 71. The traction shaft 61 passes through the through slot 72 to limit the lateral movement of the traction shaft 61, ensuring that the traction shaft 61 can only move vertically up and down. The traction rod 51 has a first position in which the moving iron core 52 is in a short-circuit state and a second position in which the moving iron core 52 is in a normal state. When the traction shaft 61 switches back to the normal state from the short-circuit state, the lower end surface of the limit pin 73 will conflict with the upper end surface of the positioning block 71, thereby preventing the traction shaft 61 from continuing to fall downward, so that the limit pin 73 can always be inserted in the through slot 72. In order to prevent the traction shaft 61 from moving out of the through slot 72 when moving upward, an anti-falling block is set at the bottom of the traction shaft 61 to prevent the traction shaft 61 from moving out of the through slot 72 when the traction shaft 61 moves upward too much.

[0047] Embodiment 2:

[0048] like Figure 3 , Figure 4 As shown, an abutment plate 731 is provided on the traction rod 51, and a portion abutting against the traction rod 51 is provided on the base 1, so as to determine the initial position when the moving iron core 52 is in a normal state and the traction rod 51 is in the second position. When the traction rod 51 switches from the second position to the first position, the traction rod 51 will rotate counterclockwise, thereby driving the abutment plate 731 to rotate counterclockwise as well, and at this time, the traction shaft 61 will be pushed upward, so that it drives the operating rod 62 to rotate, and the operating rod 62 will drive the extension rod 8 to rotate, thereby driving the releaser to release;

[0049] The mutual inductor mentioned in this embodiment may be a product of model 32AHE 63A produced by Yueqing Zhengda Soft Magnetic Alloy Co., Ltd.

[0050] On the basis of the above embodiment: the static iron core 3 is arranged in an inverted U shape, and the base 1 or the transformer housing 7 is also provided with a limiting groove 74 for the static iron core 3 to be installed, and the transformer housing 7 is provided with a fastening nail 75, and the connection between the fastening nail 75 and the transformer housing 7 is provided with an anti-drop gasket 750 for preventing the static iron core 3 from falling out.

[0051] The above specific improvements are:

[0052] Example 1: Figure 2As shown, the static iron core 3 is arranged in an inverted U shape. In order to fix the static iron core 3, the static iron core 3 can be fixed on the transformer housing 7, and a fastening nail 75 (which can be a screw column) is arranged at the opening of the limit groove 74 to limit the forward and backward movement of the static iron core 3. The setting of the limit groove 74 and the fastening nail 75 can effectively limit the displacement of the static iron core 3. The setting of the limit groove 74 and the fastening nail 75 makes it easy to assemble the static iron core 3 and the transformer housing 7. As another optional embodiment, a cross bar can also be arranged on the side wall of the base 1 to fix the static iron core 3, and a limit groove 74 is arranged on the cross bar to limit the upward and downward movement of the static iron core 3.

[0053] Example 2: Figure 5 As shown, the transformer housing 7 has a circular groove, an insert nut is arranged in the circular groove, a machine screw is inserted into the insert nut to cooperate with the insert nut, an anti-dropping gasket 750 is clamped between the insert nut and the machine screw, and the lower end of the anti-dropping gasket 750 is connected to the static iron core 3. Through the setting of the anti-dropping gasket 750, the position of the static iron core 3 can be fixed. In order to prevent the soft connecting wire on the conductive sheet 4 from contacting the machine screw, an isolation sheet 98 for wrapping the machine screw is arranged on the outside of the machine screw.

[0054] On the basis of the above embodiment: a slot 77 is provided on the bottom wall of the limiting groove 74, an insert block 76 inserted into the slot 77 is provided on the static iron core 3, and a partition plate 30 for separating the adjacent static iron cores 3 is provided between the two.

[0055] The above specific improvements are: Figure 5 and Figure 8 As shown, by inserting the plug block 76 into the slot 77, the movement of the static iron core 3 in the left and right directions can be effectively restricted, so as to better fix the position of the static iron core 3. A partition plate 30 for separating the two is provided between adjacent static iron cores 3. The partition plate 30 extends from the transformer housing 7, and the base has extension ribs wrapped around both sides of the partition plate 30. A plug-in structure is formed between the two extension ribs and the partition plate 30, which can effectively increase the creepage distance between the two static iron cores 3 and improve the safety of the product.

[0056] On the basis of the above embodiment: a plurality of receiving grooves 9 for inserting the moving iron core 52 are arranged in the traction rod 51, and a clamping structure for clamping the moving iron core 52 in the receiving groove 9 is arranged between the moving iron core 52 and the receiving groove 9, and the clamping structure includes a clamping block 91 arranged on one side of the side wall of the moving iron core 52 or the receiving groove 9 and a clamping groove 92 arranged on the other side and matched with the clamping block 91.

[0057] The above specific improvements are: Fig.10 and Fig.11As shown, the traction rod 51 is made of plastic injection molding, and the moving iron core 52 is clamped in the receiving groove 9 of the traction rod 51. In order to facilitate the insertion of the moving iron core 52, a guide inclined surface 93 is set at the clamping block 91. When the clamping block 91 is inserted into the clamping groove 92, the guide inclined surface 93 on the clamping block 91 will contact the inclined surface in the receiving groove 9. When the user pushes the moving iron core 52 into the receiving groove 9, the clamping block 91 will overcome the protrusion in the receiving groove 9 and enter the clamping groove 92.

[0058] On the basis of the above embodiment: a return spring 94 is hooked on the traction rod 51 , and the return spring 94 is hooked on the base 1 at a side facing away from the traction rod 51 .

[0059] The above specific improvements are: Figure 7 and Fig.12 As shown, one end of the return spring 94 is hooked on the traction rod 51, and the other end is hooked on the base 1, thereby providing an initial pulling force for the traction rod 51. When the short-circuit current passes through the conductive sheet 4, the magnetic force between the moving iron core 52 and the static iron core 3 will be enhanced, so that the magnetic force overcomes the pulling force of the return spring 94, causing the traction rod 51 to rotate. When the magnetic force disappears, the traction rod 51 will be driven to rotate due to the pulling force of the return spring 94 itself, so that the abutment plate 731 abuts against the base 1. In this embodiment, there are two return springs 94, and the two return springs 94 are respectively arranged at both ends of the length direction of the traction rod 51. Compared with the prior art method in which three backup protection structures need to be provided with a spring structure, the number of parts is reduced and assembly is faster and more convenient.

[0060] On the basis of the above embodiment: a plurality of conductive sheets 4 are provided on the base, the conductive sheet 4 includes a conductive sheet body 41, a contact end 42 arranged at one end of the conductive sheet body 41 and a positioning end 43 arranged at the other end, the contact end 42 is inserted into the static iron core 3, and the positioning end 43 is connected to the base 1 by a screw 44.

[0061] The above specific improvements are: Figure 5 , Figure 6 and Figure 7As shown, a avoidance groove 2 is provided on the transformer housing 7, and the avoidance groove 2 is for the wire or other conductive structure to pass through. The current change of the conductive structure controls the attraction of the moving iron core 52 and the static iron core 3. The conductive sheet 4 in the prior art is mostly made of soft copper wire, and the soft copper wire generates a magnetic circuit. Since the position of the soft connection cannot be uniquely determined, the magnetic field is unstable. Therefore, the structure has the defects of high instantaneous action multiple or no action, and unstable instantaneous action. Compared with the prior art, the conductive sheet 4 is composed of a hard copper sheet (or an iron sheet), and the positioning end 43 is fixed to the base 1 with screws, so as to effectively fix the position of the conductive sheet 4, and the contact end 42 is inserted into the static iron core 3. When the position of the conductive sheet 4 is fixed, the magnetic field is only related to the current, thereby effectively improving the stability of the instantaneous action, thereby improving the tripping reaction speed.

[0062] On the basis of the above embodiment: the traction rod 51 is injection molded, and a bottom cover 95 for locating the position of the traction rod 51 is provided at the bottom of the traction rod 51 .

[0063] On the basis of the above embodiment: a reinforcing needle 53 is arranged inside the traction rod 51 to prevent the traction rod 51 from deforming.

[0064] The above specific improvements are: Figure 6-Figure 9 As shown, by setting the reinforcing needle 53 in the traction rod 51, the traction rod 51 can be effectively prevented from being deformed, and a clamping wheel 96 is set on the traction rod 51 to increase the creepage distance. A groove for avoiding the clamping wheel 96 is set on the bottom cover 95, and positioning grooves for the two sides of the traction rod 51 to be clamped in order to position the traction rod 51 are set on the base 1. The positioning grooves are used to limit the left and right movement of the traction rod 51. By setting the positioning grooves, the longitudinal position of the traction rod 51 is fixed, so that a gap is left between the groove and the clamping wheel 96 to allow the clamping wheel 96 to rotate, and by setting the bottom cover 95, the up and down movement of the traction rod 51 can be limited.

[0065] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A backup protection device for a circuit breaker, characterized in that: include: Base (1); A plurality of static iron cores (3) are arranged at intervals inside the base (1); A transmission rod assembly (6), comprising a traction shaft (61); An operating mechanism (11) comprising an operating rod (62); The traction rod assembly (5) comprises a traction rod (51) and a movable iron core (52) arranged on the traction rod (51) and corresponding to a plurality of static iron cores (3); one end of the traction shaft (61) is linked to the traction rod (51) and the other end is linked to the operating rod (62); the traction shaft (61) is slidably arranged along the height direction of the circuit breaker and can drive the operating rod (62) to rotate; a first extension block (63) capable of contacting the upper end of the traction shaft (61) is arranged on the operating rod (62); a second extension block (64) contacting the lower end of the traction shaft (61) is arranged on the traction rod (51); one end of the traction shaft (61) is linked to the first extension block (63) and the other end is linked to the second extension block (64); the operating rod (62) is arranged parallel to the traction rod (51) and the traction shaft (61) is vertically arranged therebetween.

2. The backup protection device for a circuit breaker according to claim 1, characterized in that: The operating mechanism (11) further comprises an extension rod (8) located on the operating rod (62), and a positioning block (71) for assisting the vertical movement of the traction shaft (61) is sleeved on the outside of the traction shaft (61).

3. The backup protection device for a circuit breaker according to claim 2, characterized in that: The invention also comprises a transformer housing (7), wherein the transformer housing (7) is arranged inside the base (1), the positioning block (71) is arranged on the transformer housing (7) or the base (1), the positioning block (71) is provided with a through slot (72) for the traction shaft (61) to pass through, the traction rod (51) is provided with an abutment plate (731), the abutment plate (731) can abut against the base (1), the traction rod (51) has a first position in which the moving iron core (52) is in a short-circuit state and a second position in which the moving iron core (52) is in a normal state, and when the traction rod (51) is in the second position, the abutment plate (731) abuts against the base (1).

4. The backup protection device for a circuit breaker according to claim 3, characterized in that: The static iron core (3) is arranged in an inverted U shape, and a limit groove (74) for the static iron core (3) to be installed is also arranged on the base (1) or the transformer housing (7), and a fastening nail (75) is arranged on the transformer housing (7), and an anti-dropping gasket (750) for preventing the static iron core (3) from falling out is arranged at the connection between the fastening nail (75) and the transformer housing (7).

5. The backup protection device for a circuit breaker according to claim 4, characterized in that: A slot (77) is provided on the bottom wall of the limiting groove (74), an insert block (76) inserted into the slot (77) is provided on the static iron core (3), and a partition plate (30) is provided between adjacent static iron cores (3) for separating the two.

6. The backup protection device for a circuit breaker according to claim 1, characterized in that: The traction rod (51) is provided with a plurality of receiving grooves (9) for inserting the moving iron core (52), and a clamping structure for clamping the moving iron core (52) in the receiving groove (9) is provided between the moving iron core (52) and the receiving groove (9), and the clamping structure comprises a clamping block (91) provided on one side of the side wall of the moving iron core (52) or the receiving groove (9) and a clamping groove (92) provided on the other side and matched with the clamping block (91).

7. A backup protection device for a circuit breaker according to any one of claims 1 to 6, characterized in that: A return spring (94) is hooked on the traction rod (51), and the return spring (94) is hooked on the base (1) at a side facing away from the traction rod (51).

8. A backup protection device for a circuit breaker according to any one of claims 1 to 6, characterized in that: A plurality of conductive sheets (4) are provided on the base, and the conductive sheets (4) include a conductive sheet body (41), a contact end (42) arranged at one end of the conductive sheet body (41), and a positioning end (43) arranged at the other end, the contact end (42) is inserted into the static iron core (3), and the positioning end (43) is connected to the base (1) by means of screws (44).

9. The backup protection device for a circuit breaker according to claim 7, characterized in that: The traction rod (51) is injection molded, and a bottom cover (95) for locating the position of the traction rod (51) is provided at the bottom of the traction rod (51).

10. A backup protection device for a circuit breaker according to claim 9, characterized in that: A reinforcing needle (53) is arranged inside the traction rod (51) for preventing the traction rod (51) from deforming.

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