Low-voltage circuit breaker with adjustable over-travel function

Abstract

The invention discloses a low-voltage circuit breaker with an adjustable over-travel function, which is characterized in that a base is provided with a rotating shaft groove and a concave cavity, and the concave cavity is communicated with the bottom surface of the rotating shaft groove; the clamping piece is accommodated in the concave cavity; the rotating shaft is matched with the rotating shaft groove and the clamping piece to rotate relatively; the adjusting structure is used for adjusting the height of the clamping piece relative to the base; through the arrangement of the clamping pieces, the contact area between the rotating shaft and the base is increased, and the structural strength is improved, so that the service life of the circuit breaker is prolonged while the performance of the circuit breaker is maintained; and secondly, the installation is convenient, the installation process of the clamping piece is simple, and other parts of the circuit breaker do not need to be greatly modified. A user can install the clamping pieces according to actual needs so as to achieve the optimal over-travel effect. Through the arrangement of the adjusting structure, position adjustment of the clamping pieces is achieved, after abrasion occurs, the clamping pieces can move upwards and the rotating shaft is located in the initial state again by adjusting the positions of the clamping pieces, and therefore the optimal over-travel effect is achieved.

Description

Technical Field

[0001] The invention relates to the field of electrical technology, and in particular to a low-voltage circuit breaker with an adjustable over-travel function. Background Art

[0002] In the electrical field, the role of overtravel is to provide sufficient contact pressure for reliable contact between the moving contact and the static contact, to avoid insufficient contact pressure due to electromagnetic fluctuations, and to ensure that the contact can still generate a large contact pressure after a certain degree of wear.

[0003] In the current design of low-voltage circuit breakers, overtravel is a key factor in ensuring mechanical performance and life. Overtravel that is too large or too small will affect the performance of the circuit breaker. Appropriate overtravel can ensure the excellent performance of the product in terms of safety and functionality. As the use time increases, the overtravel of the circuit breaker tends to decrease, which will have a negative impact on the service life and performance of the product. Overtravel is affected by many factors. Among them, the rotating shaft (with the moving contact knife fixed) and the base are rotatably connected. During the rotation of the rotating shaft and the base, wear will occur between the two, resulting in a reduction in overtravel. Moreover, low-voltage circuit breakers on the market currently generally have the problem of unadjustable overtravel, which leads to performance degradation and increased maintenance costs after long-term use. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is how to adjust the overtravel. To this end, a low-voltage circuit breaker with an adjustable overtravel function comprises:

[0005] A base, wherein the base is provided with a rotating shaft groove and a concave cavity, and the concave cavity is communicated with the bottom surface of the rotating shaft groove;

[0006] A clip, the clip being accommodated in the concave cavity;

[0007] A rotating shaft, the rotating shaft cooperates with the rotating shaft groove and the clip to rotate relatively, and a movable contact knife is fixed to the rotating shaft;

[0008] An adjustment structure is provided for adjusting the height of the clip relative to the base.

[0009] The adjusting structure comprises an adjusting member, and the adjusting member extends through the bottom surface of the base to the concave cavity and cooperates with the clip.

[0010] The adjusting member is threadedly connected to the clip.

[0011] It also includes an indication component, wherein the side wall of the base is provided with an indication cavity and a notch, the indication cavity is communicated with the notch, the indication component is accommodated in the indication cavity, one end of the indication component extends into the base to cooperate with the movable contact knife, and the other end of the indication component extends toward the notch. When the wear amount of the rotating shaft, the rotating shaft groove and the clip exceeds a preset threshold, the movable contact knife drives the indication component to move, and the other end of the indication component moves toward the notch.

[0012] The indicating assembly includes an indicating member, which includes a main body, a driving portion and an indicating portion. The main body is accommodated in the indicating cavity and rotates relative to the indicating cavity. One end of the driving portion is connected to one end of the main body, and the other end of the driving portion cooperates with the movable contact knife. One end of the indicating portion is connected to the other end of the main body, and the other end of the indicating portion extends toward the notch. When the wear amount of the rotating shaft, the rotating shaft groove and the clip exceeds a preset threshold, the movable contact knife drives the driving portion to move, and the indicating portion moves toward the notch.

[0013] The clip is provided with a groove, and the bottom surface of the groove is coplanar with the bottom surface of the shaft groove; or, the bottom surface of the groove is higher than the bottom surface of the shaft groove, and the height from the bottom surface of the groove to the bottom surface of the shaft groove is 1-3 mm.

[0014] The clip is provided with two supporting legs extending upward, and the supporting legs abut against the side walls of the rotating shaft groove.

[0015] The side wall of the rotating shaft groove is provided with a limiting groove, and the supporting leg is partially embedded in the limiting groove.

[0016] One of the clip and the shaft groove is provided with a positioning protrusion, and the other of the clip and the shaft groove is provided with a positioning groove matched with the positioning protrusion.

[0017] The positioning protrusion is arranged on the supporting foot, and the positioning groove is arranged on the limiting groove.

[0018] The technical solution of the present invention has the following advantages:

[0019] 1. The present invention provides a low-voltage circuit breaker with an adjustable overtravel function. By setting a clip, the contact area between the rotating shaft and the base is increased, and the structural strength is increased, thereby maintaining the performance of the circuit breaker while extending its service life; secondly, it is easy to install, and the installation process of the clip is simple, and no major modifications are required to other parts of the circuit breaker. Users can install the clip according to actual needs to achieve the best overtravel effect; the setting of the adjustment structure forms the position adjustment of the clip. After wear occurs, the position of the clip can be adjusted to make the clip move up and the rotating shaft return to the initial state to achieve the best overtravel effect.

[0020] 2. The present invention provides a low-voltage circuit breaker with an adjustable overtravel function, in which the adjusting member is inserted from below to form an adjusting effect, has a hidden effect, and will not interfere with the internal structure of the circuit breaker.

[0021] 3. The present invention provides a low-voltage circuit breaker with an adjustable overtravel function, which achieves an adjustment effect through a threaded connection, so that the clip rises to compensate for the loss caused by wear.

[0022] 4. The present invention provides a low-voltage circuit breaker with an adjustable overtravel function, wherein the indicating component forms an indicating effect, so that the operator can know whether the overtravel reduction phenomenon occurs.

[0023] 5. The present invention provides a low-voltage circuit breaker with an adjustable over-travel function, in which the main body forms a lever effect, one end cooperates with the driving part, and the other end cooperates with the indicating part. When the wear exceeds the preset threshold, the rotation axis of the rotating shaft will shift downward. At this time, the moving contact knife will resist the driving part to form a driving effect. Due to the lever action, the indicating part will also perform corresponding actions.

[0024] 6. The present invention provides a low-voltage circuit breaker with an adjustable overtravel function. This structural setting forms a matching effect between the clip, the shaft groove and the shaft, thereby improving the matching effect.

[0025] 7. The present invention provides a low-voltage circuit breaker with an adjustable overtravel function. The setting of the support feet creates a clamping and fixing effect, while also increasing the contact area between the clip and the cavity and the shaft groove, thereby improving the structural strength.

[0026] 8. The low-voltage circuit breaker with an adjustable overtravel function provided by the present invention has a embedded setting so that the support legs are fixed more firmly, forming a limit in the horizontal direction.

[0027] 9. The present invention provides a low-voltage circuit breaker with an adjustable overtravel function, wherein the positioning protrusion and the positioning groove form a positioning effect of the initial position, thereby improving the fit between the clip and the rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] Figure 1 A schematic structural diagram of a low voltage circuit breaker with an adjustable overtravel function provided by the present invention;

[0030] Figure 2 A side view of a low voltage circuit breaker with an adjustable overtravel function provided by the present invention;

[0031] Figure 3 A cross-sectional view of a low voltage circuit breaker with an adjustable overtravel function provided by the present invention;

[0032] Figure 4 A cross-sectional view from another angle of a low-voltage circuit breaker with an adjustable overtravel function provided by the present invention;

[0033] Figure 5 A schematic diagram of the partial structure of a low-voltage circuit breaker with an adjustable over-travel function provided by the present invention;

[0034] Figure 6 A schematic diagram of the cooperation between the clip and the adjusting member provided by the present invention;

[0035] Figure 7 A schematic diagram of a local structure of a low-voltage circuit breaker with an adjustable overtravel function provided by the present invention from another angle;

[0036] Figure 8 for Figure 7 A partial enlarged view of part A in the middle.

[0037] Description of reference numerals:

[0038] 11. Base; 12. Clip; 13. Rotating shaft; 14. Positioning protrusion; 15. Positioning groove; 16. Adjusting member; 17. Indicating member; 18. Moving contact knife; 111. Rotating shaft groove; 112. Concave cavity; 113. Indicating cavity; 114. Notch; 121. Groove; 122. Support foot; 171. Main body; 172. Driving part; 173. Indicating part; 1111. Limiting groove. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Example 1

[0044] This embodiment provides a low voltage circuit breaker with an adjustable overtravel function, as shown in the attached Figure 1-Figure 8 As shown, including:

[0045] The base 11 is provided with a shaft groove 111 and a concave cavity 112, and the concave cavity 112 is communicated with the bottom surface of the shaft groove 111. In this embodiment, the concave cavity 112 is located below the shaft groove 111, and the concave cavity 112 is communicated with the shaft groove 111. One shaft groove 111 corresponds to one concave cavity 112 or multiple concave cavities 112. The number of shaft grooves 111 here is adjusted according to the size of the circuit breaker. For example, for a three-phase circuit breaker, the number of shaft grooves 111 can be three or four. In this embodiment, one base 11 is provided with three shaft grooves 111, and each shaft groove 111 corresponds to one concave cavity 112. Since the structure of each shaft groove 111 is consistent with that of the concave cavity 112, only one shaft groove 111 and concave cavity 112 are described. Those skilled in the art can adjust the relevant quantity according to actual needs to meet different structural requirements.

[0046] The clip 12 is accommodated in the concave cavity 112 , wherein the clip 12 may be entirely located in the concave cavity 112 , or the clip 12 may be partially located in the concave cavity 112 , and the rest of the clip 12 extends to the shaft groove 111 .

[0047] The rotating shaft 13 cooperates with the rotating shaft groove 111 and the clip 12 to rotate relative to each other. The cooperation here specifically refers to the abutment between the rotating shaft 13 and the rotating shaft groove 111 and the clip 12. Here, the rotating shaft 13 can abut against the rotating shaft groove 111 and the clip 12 at the same time. The rotating shaft 13 can also abut against the clip 12 first, and then abut against the rotating shaft groove 111 when the clip 12 is worn to a certain extent. The rotating shaft 13 cooperates with the movable contact knife 18 to form contact pressure, and the rotating shaft 13 rotates relative to the base 11. In this embodiment, the rotating shaft 13 cooperates with the three rotating shaft grooves 111 to form a rotation effect. It should be noted that the clip 12 also abuts against the rotating shaft 13 to form a relative rotation effect.

[0048] The adjustment structure adjusts the height of the clip 12 relative to the base 11. The setting of the adjustment structure forms the position adjustment of the clip 12. When wear occurs, the position of the clip 12 can be adjusted so that the clip 12 moves vertically upward and the shaft 13 is reset to the initial state to achieve the best overtravel effect.

[0049] The arrangement of the clip 12 increases the contact area between the rotating shaft 13 and the base 11, and increases the structural strength, thereby extending the service life of the circuit breaker while maintaining its performance; secondly, the installation is convenient, and the installation process of the clip 12 is simple, and no major modifications are required to other parts of the circuit breaker. Users can install the clip 12 according to actual needs to achieve the best overtravel effect; the arrangement of the adjustment structure forms the position adjustment of the clip 12. After wear occurs, the position of the clip 12 can be adjusted so that the clip 12 moves up and the rotating shaft 13 is back to the initial state to achieve the best overtravel effect.

[0050] Specifically, as attached Figure 4-Figure 8 As shown, the adjustment structure includes an adjustment member 16, and the adjustment member 16 extends through the bottom surface of the base 11 to the concave cavity 112 and cooperates with the clip 12. The adjustment member 16 is inserted from the bottom to form an adjustment effect, has a hidden effect, and will not interfere with the internal structure of the circuit breaker. Here, the base 11 can also be provided with a countersunk hole, so that the part of the adjustment member 16 located outside the base 11 is embedded in the countersunk hole, further improving the hidden effect. In addition, the adjustment member 16 can also be located at the top, but the space of the entire circuit breaker needs to be considered, and a certain space needs to be reserved for the adjustment member 16, which affects the overall layout.

[0051] Specifically, the adjusting member 16 is threadedly connected to the clip 12. The threaded connection achieves an adjusting effect, so that the clip 12 rises vertically upward to compensate for the loss caused by wear.

[0052] Specifically, as attached Figure 1-Figure 5 The side wall of the base 11 is provided with an indication cavity 113 and a notch 114. The indication cavity 113 is arranged on the long side wall of the base 11. The indication cavity 113 is open upward, that is, the indication cavity 113 is open toward one side of the middle cover. The indication component can be inserted from the top and then accommodated in the indication cavity 113. The indication cavity 113 is connected with the notch 114. Here, the notch 114 is connected with the outside and the base 11. It should also be noted that the indication cavity 113 is also connected with the inside of the base 11. The indication component is accommodated in the indication cavity 113. One end of the indication component extends into the base 11 to cooperate with the moving contact knife 18, and the other end of the indication component extends toward the notch 114. When the wear amount of the rotating shaft 13, the rotating shaft groove 111, and the clip 12 exceeds the preset threshold, the moving contact knife 18 drives the indication component to move, and the other end of the indication component moves toward the notch 114. The indication component forms an indication effect, so that the operator can know whether the phenomenon of overtravel reduction occurs. The preset threshold value here can be adjusted according to actual needs. When the wear amount does not exceed the preset threshold value, the moving contact blade 18 will not contact the indicating component in the closed position.

[0053] Specifically, as attached Figure 1-Figure 5The indicating assembly shown includes an indicating member 17, which includes a main body 171, a driving portion 172 and an indicating portion 173. The main body 171 is accommodated in the indicating cavity 113 and rotates relative to the indicating cavity 113. The main body 171 and the indicating cavity 113 form a lever-matching effect. Here, the main body 171 does not rotate with the indicating cavity 113 at its end. Those skilled in the art can adjust the corresponding rotational connection position according to actual needs. For example, the rotational connection is located in the middle of the main body 171. At this time, the ratio of the two ends is equal, forming a one-to-one effect. The ratio can also be enlarged or reduced according to actual needs to achieve the indicating effect. One end of the driving part 172 is connected to one end of the main body 171, and the other end of the driving part 172 cooperates with the movable contact blade 18. One end of the indicating part 173 is connected to the other end of the main body 171, and the other end of the indicating part 173 extends toward the notch 114. When the wear of the rotating shaft 13, the rotating shaft groove 111, and the clip 12 exceeds a preset threshold, the movable contact blade 18 drives the driving part 172 to move, and the indicating part 173 moves toward the notch 114. The main body 171 forms a lever effect, with one end cooperating with the driving part 172 and the other end cooperating with the indicating part 173. When the wear exceeds the preset threshold, the rotation axis of the rotating shaft 13 will deviate downward, and at this time, the movable contact blade 18 will abut against the driving part 172 to form a driving effect. Due to the lever effect, the indicating part 173 will also move accordingly. Specifically speaking of the coordinate axis, the main body 171 is located in the X-axis direction, the driving part 172 extends toward the bottom inside along the Y-axis direction, and the indicating part 173 extends upward in the Z-axis direction, forming a special-shaped structure. Here, the indicating member 17 can be an integrated structure, or the indicating member 17 can be a split combination. In this embodiment, in the initial state, the top of the indicating member 17 can be flush with the bottom surface of the notch 114. When the moving contact knife 18 cooperates with the indicating member 17, the indicating part 173 moves upward to form an indicating effect. At this time, the operator can adjust the adjusting member 16 to form an adjustment effect of the clip 12, so that the clip 12 moves up and the rotating shaft 13 returns to the overtravel position. Here, the top of the indicating part 173 can also exceed the bottom surface of the notch 114. Furthermore, a scale can be printed on the side wall of the notch 114, and the wear amount can be quickly obtained through the scale, and then a precise adjustment effect can be achieved by rotating the number of circles of the adjusting member 16 (one circle corresponds to how much height the clip 12 rises). In addition, those skilled in the art may also use other indicating structures for indication.

[0054] Specifically, as attached Figure 4-Figure 8The clip 12 shown is provided with a groove 121, and the bottom surface of the groove 121 is coplanar with the bottom surface of the shaft groove 111. Here, coplanar specifically means that the two are located on the same surface, which can be located on the same plane or on the same arc surface. Alternatively, the bottom surface of the groove 121 is higher than the bottom surface of the shaft groove 111, and the height from the bottom surface of the groove 121 to the bottom surface of the shaft groove 111 is 1-3 threads. A slightly too high setting is adopted, so that the shaft 13 first cooperates with the clip 12 to form a rotation effect, and then after the clip 12 is worn, the shaft 13 and the shaft groove 111 and the clip 12 are simultaneously abutted to form a relative rotation effect. This structural setting forms a matching effect between the clip 12, the shaft groove 111 and the shaft 13, and improves the matching effect.

[0055] Specifically, as attached Figure 4-Figure 8 The clip 12 shown is provided with two legs 122 extending upward, and the two legs 122 are arranged on both sides of the groove 121. Here, upward specifically refers to the side away from the bottom surface of the base 11. The legs 122 are against the side wall of the shaft groove 111. Here, the legs 122 pass through the concave cavity 112 and extend upward, so that the shaft 13 cooperates with the side wall of the shaft groove 111. The setting of the legs 122 forms a clamping and fixing effect, and at the same time increases the contact area between the clip 12 and the concave cavity 112 and the shaft groove 111, thereby improving the structural strength. Here, part of the clip 12 is located in the concave cavity 112, and the rest of the clip 12 passes through the concave cavity 112 and is against the shaft groove 111. In this embodiment, the shaft groove 111 is a U-shaped groove, and the two legs 122 are against the two sides of the U-shaped groove. Moreover, the two legs 122 cooperate with the groove 121 to form a U-shaped structure.

[0056] Specifically, the side wall of the shaft groove 111 is provided with a limiting groove 1111, and the support leg 122 is partially embedded in the limiting groove 1111. Through the embedded setting, the support leg 122 is fixed more firmly, forming a limit in the horizontal direction. Here, the limiting groove 1111 is specifically located on the side wall of the U-shaped groove.

[0057] Specifically, as attached Figure 4-Figure 8 As shown, one of the clip 12 and the shaft groove 111 is provided with a positioning protrusion 14, and the other of the clip 12 and the shaft groove 111 is provided with a positioning groove 15 that cooperates with the positioning protrusion 14. The positioning protrusion 14 and the positioning groove 15 form a positioning effect of the initial position, thereby improving the fit between the clip 12 and the shaft 13. Here, whether the positioning protrusion 14 is provided on the clip 12 or the shaft groove 111 can be adjusted according to actual needs.

[0058] Specifically, the positioning protrusion 14 is provided on the support foot 122, and the positioning groove 15 is provided on the limiting groove 1111. It should be noted that the positioning protrusion 14 and the positioning groove 15 are only used for positioning at the initial position, forming a limit in the horizontal direction and the vertical downward direction (i.e., the direction vertical to the bottom surface of the base 11), but there is no limit in the vertical upward direction, that is, the clip 12 can move vertically upward.

[0059] Specifically, the wear resistance of the clip 12 is greater than that of the base 11 , that is, during the rotation of the shaft 13 , the shaft 13 cooperates with the shaft groove 111 and the clip 12 , and wear occurs, but the degree of wear of the clip 12 is less than that of the shaft groove 111 .

[0060] Specifically, the clip 12 is made of POM. In this embodiment, the base 11 is made of plastic insulating material, and the wear resistance of the base 11 is lower than that of the POM material. In addition, the clip 12 can also be made of other materials as long as the wear resistance of the clip 12 is higher than that of the base 11.

[0061] 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 low voltage circuit breaker with an adjustable overtravel function, characterized in that: include: A base (11), the base (11) being provided with a rotating shaft groove (111) and a concave cavity (112), the concave cavity (112) being in communication with the bottom surface of the rotating shaft groove (111); A clip (12), the clip (12) being accommodated in the concave cavity (112); A rotating shaft (13), wherein the rotating shaft (13) cooperates with the rotating shaft groove (111) and the clamping piece (12) to rotate relatively, and a movable contact knife (18) is fixed to the rotating shaft (13); An adjustment structure is provided, wherein the adjustment structure adjusts the height of the clip (12) relative to the base (11).

2. The low voltage circuit breaker with adjustable overtravel function according to claim 1, characterized in that: The adjustment structure comprises an adjustment member (16), wherein the adjustment member (16) passes through the bottom surface of the base (11) and extends to the concave cavity (112) to cooperate with the clip (12).

3. The low voltage circuit breaker with adjustable overtravel function according to claim 2, characterized in that: The adjusting member (16) is threadedly connected to the clamping piece (12).

4. The low voltage circuit breaker with adjustable overtravel function according to claim 1, characterized in that: The invention also comprises an indicating component, wherein the side wall of the base (11) is provided with an indicating cavity (113) and a notch (114), the indicating cavity (113) is communicated with the notch (114), the indicating component is accommodated in the indicating cavity (113), one end of the indicating component extends into the base (11) to cooperate with the movable contact knife (18), and the other end of the indicating component extends toward the notch (114); when the wear amount of the rotating shaft (13), the rotating shaft groove (111) and the clip (12) exceeds a preset threshold value, the movable contact knife (18) drives the indicating component to move, and the other end of the indicating component moves toward the notch (114).

5. The low voltage circuit breaker with adjustable overtravel function according to claim 4, characterized in that: The indicating assembly comprises an indicating member (17), wherein the indicating member (17) comprises a main body (171), a driving member (172) and an indicating member (173); the main body (171) is accommodated in the indicating cavity (113) and rotates relative to the indicating cavity (113); one end of the driving member (172) is connected to one end of the main body (171); the other end of the driving member (172) cooperates with the movable contact knife (18); one end of the indicating member (173) is connected to the other end of the main body (171); the other end of the indicating member (173) extends toward the notch (114); when the wear amount of the rotating shaft (13), the rotating shaft groove (111) and the clip (12) exceeds a preset threshold value, the movable contact knife (18) drives the driving member (172) to move, and the indicating member (173) moves toward the notch (114).

6. The low voltage circuit breaker with adjustable overtravel function according to claim 1, characterized in that: The clip (12) is provided with a groove (121), and the bottom surface of the groove (121) is coplanar with the bottom surface of the rotating shaft groove (111); or, the bottom surface of the groove (121) is higher than the bottom surface of the rotating shaft groove (111), and the height from the bottom surface of the groove (121) to the bottom surface of the rotating shaft groove (111) is 1-3 mm.

7. The low voltage circuit breaker with adjustable overtravel function according to claim 1, characterized in that: The clip (12) is provided with two supporting legs (122) extending upward, and the supporting legs (122) abut against the side walls of the rotating shaft groove (111).

8. The low voltage circuit breaker with adjustable overtravel function according to claim 7, characterized in that: A limiting groove (1111) is provided on the side wall of the rotating shaft groove (111), and the supporting leg (122) is partially embedded in the limiting groove (1111).

9. The low voltage circuit breaker with adjustable overtravel function according to claim 8, characterized in that: One of the clamping piece (12) and the rotating shaft groove (111) is provided with a positioning protrusion (14), and the other of the clamping piece (12) and the rotating shaft groove (111) is provided with a positioning groove (15) matched with the positioning protrusion (14).

10. The low voltage circuit breaker with adjustable overtravel function according to claim 9, characterized in that: The positioning protrusion (14) is arranged on the supporting foot (122), and the positioning groove (15) is arranged on the limiting groove (1111).

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