ADJUSTING MECHANISM OF A PROTECTIVE SWITCH AND CORRESPONDING PROTECTIVE SWITCH

Description

FIELD

[0001] Example embodiments of the present disclosure generally relate to the field of electrical equipment, and in particular, to an adjustment mechanism for a circuit breaker and the corresponding circuit breaker.BACKGROUND

[0002] In the field of electrical equipment, a circuit breaker is typically connected to a main circuit so as to cut off the main circuit when a current in the circuit exceeds a threshold. The circuit breaker includes a moving contact and a stationary contact, which can be coupled to each other to form a complete circuit. If the current through the circuit breaker is too large, the moving contact would be driven to decouple from the stationary contact to cut off the circuit.

[0003] The firmness of the connection between the moving contact and the stationary contact should be appropriate. At one end, if a contact pressure provided between the moving contact and the stationary contact is too small, the connection is too loose, a slight shaking or vibration during the operation of the circuit breaker may then cause the moving contact to accidentally disengage from the stationary contact, which is undesirable. At the other end, if the contact pressure provided between the moving contact and the stationary contact is too large, a driving unit is unable to remain the moving contact in a correct and reliable location, which is also undesirable. Therefore, how to adjust the firmness of the connection between the moving contact and the stationary contact in a straightforward and convenient manner remains a challenge.

[0004] US 4 504 808 A discloses an adjusting mechanism of a circuit breaker according to the preamble of claim 1.SUMMARY

[0005] In general, example embodiments of the present disclosure provide a solution for adjusting the firmness of the connection between the moving contact and the stationary contact conveniently and intuitively.

[0006] In a first aspect, there is provided an adjusting mechanism of a circuit breaker. The adjusting mechanism comprises an operating rod configured to operate a moving contact of the circuit breaker via a contact spring arranged between the operating rod and the moving contact; a transmitting rod pivotally coupled to the operating rod and configured to drive the operating rod to move towards or away from a stationary contact of the circuit breaker; an adjusting block pivotally coupled to the transmitting rod at a position different from the operating rod and comprising a thread hole; a bracket comprising a first supporting element and a second supporting element spaced from the first supporting element along a first direction, each of the first supporting element and the second supporting element comprising a through hole extending along the first direction; and an adjusting bolt extending through the through hole of the first supporting element, the thread hole of the adjusting block, and the through hole of the second supporting element sequentially along the first direction, the adjusting bolt comprising an external thread engaging with the thread hole, such that when the adjusting bolt is actuated to rotate about its axis, the adjusting block slides along the first direction between the first supporting element and the second supporting element.

[0007] According to embodiments of the present disclosure, a stroke of the contact spring can be adjusted in a convenient and precise manner. In this way, the firmness of the connection between the moving contact and the stationary contact can be adjusted conveniently and reliably.

[0008] In some example embodiments, the bracket further comprises: a third supporting element arranged between the first supporting element and the second supporting element and configured to support the adjusting block when the adjusting block slides between the first supporting element and the second supporting element. In this manner, the adjusting block can move robustly along the adjusting bolt upon the adjusting bolt being actuated to rotate.

[0009] In some example embodiments, the adjusting block further comprises: a block body provided with the thread hole; and two wings provided at both sides of the block body along a second direction perpendicular to the first direction and configured to be supported by the third supporting element. In this manner, a contact area between the adjusting block and the bracket can be increased to ensure a more reliable movement of the adjusting block.

[0010] In some example embodiments, each of the two wings has a height smaller than a height of the block body along a third direction perpendicular to the first direction and the second direction. In this way, the adjusting block can occupy a smaller space within the circuit breaker.

[0011] In some example embodiments, each of the two wings comprises a second thread hole extending along the third direction and configured to allow a fastening bolt to penetrate therethrough to mount the adjusting block onto the third supporting element of the bracket. In this way, after the adjusting block is driven to a desired position, it can be locked to the bracket to allow the operating rod to be driven by the transmitting rod.

[0012] In some example embodiments, each of the first supporting element, the second supporting element and the third supporting element comprises a plate. In this way, the bracket is easy to manufacture and of low cost.

[0013] In some example embodiments, a bolt head of the adjusting bolt abuts the first supporting element, and a free end of the adjusting bolt opposite to the bolt head abuts the second supporting element and is coupled to a locknut. In this way, the adjusting bolt can be adjusted in a reliable and cost-effective manner.

[0014] In some example embodiments, the bolt head is a hexagonal bolt head. In this way, the adjustment of the bolt head can be carried out in a more intuitive manner.

[0015] In some example embodiments, the first supporting element and the second supporting element are parallel to each other. In this way, the first supporting element and the second supporting element can be provided in a more compact manner.

[0016] In a second aspect, a circuit breaker is provided. The circuit breaker comprises a stationary contact; and a moving contact configured to be operated by an operating rod of an adjusting mechanism of the first aspect.

[0017] In some example embodiments, the circuit breaker further comprising: a first actuation element coupled to the moving contact; a second actuation element coupled to the operating rod of the adjusting mechanism; and a contact spring having one end coupled to the first actuation element and the other end coupled to the second actuation element. In this manner, the stroke of the contact spring can be adjusted simply by rotating the adjusting bolt.

[0018] In some example embodiments, the first actuation element comprises a protrusion at one end and an annular shoulder adjacent to the protrusion, and the second actuation element comprises a cylindrical chamber adjacent to an end portion, the cylindrical chamber comprising an opening to allow the protrusion, the shoulder and the contact spring to be contained within the chamber, the contact spring being provided between the shoulder of the first actuation element and an inner wall of the cylindrical chamber. In this manner, the contact spring can be securely provided within the cylindrical chamber to exert a contact pressure between the moving contact and the stationary contact.BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Through the following detailed description with reference to the accompanying drawings, the above and other objectives, features and advantages of the example embodiments disclosed herein will become more comprehensible. In the drawings, several example embodiments disclosed herein will be illustrated in an exemplary and in a non-limiting manner, wherein: Fig. 1 illustrates a schematic view of a circuit breaker comprising an adjusting mechanism in accordance with an example embodiment of the present disclosure; Fig. 2 illustrates a schematic view of a vacuum arc-extinguishing chamber of the circuit breaker in accordance with an example embodiment of the present disclosure; Fig. 3 illustrates an enlarged view of portion I of Fig. 1; Fig. 4 illustrates an enlarged view of portion II of Fig. 2; and Fig. 5 illustrates a perspective view of an adjusting block in accordance with an example embodiment of the present disclosure.

[0020] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION

[0021] Principles of the present disclosure will now be described with reference to some example embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and to help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. The disclosure described herein can be implemented in various manners other than the ones described below.

[0022] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0023] References in the present disclosure to "one embodiment," "an embodiment," "an example embodiment," and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to apply such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

[0024] It should be understood that although the terms "first" and "second" etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term "and / or" includes any and all combinations of one or more of the listed terms.

[0025] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "has", "having", "includes" and / or "including", when used herein, specify the presence of stated features, elements, and / or components etc., but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.

[0026] According to embodiments of the present disclosure, a maintenance worker or a robot is allowed to adjust the firmness of the connection between the moving contact and the stationary contact accurately outside the circuit breaker.

[0027] Example embodiments will be described in more detail hereinafter in accordance with Figs. 1-5.

[0028] As illustrated in Fig. 1, the circuit breaker 1 generally includes a moving contact 114 and a stationary contact 116 both disposed within a vacuum arc-extinguishing chamber 115. The stationary contact 116 is fixedly mounted in the circuit breaker 1 and is unable to move during the operation of the circuit breaker 1. The moving contact 114 as illustrated is coupled to a first actuation element 117. When the circuit breaker 1 is connected to a main circuit (not shown), the stationary contact 116 and the moving contact 114 are contacted to each other to form a complete circuit. When a current passing through the circuit breaker 1 is detected to be greater than a threshold, the first actuation element 117 may be controlled to pull the moving contact 114 to disconnect from the stationary contact 116 and further move away from the stationary contact 116 in a first direction L1. In this way, the moving contact 114 and the stationary contact 116 can be separated from each other, such that the main circuit is switched off to protect the electrical equipment in the main circuit from being damaged by the excessive current.

[0029] In order to allow a good and reliable contact between the stationary contact 116 and the moving contact 114, there should be a certain degree of a contact pressure between the stationary contact 116 and the moving contact 114 when both contacts are coupled to each other. This is achieved by a contact spring 112. With reference to Fig. 2, the contact spring 112 is arranged within a cylindrical chamber 1182 of a second actuation element 118, which may be controlled by the control mechanism 20.

[0030] The operating principle of the contact spring 112 will be described hereinafter. When the circuit breaker 1 is switched on, the second actuation element 118 is driven to move towards the stationary contact 116. The second actuation element 118 causes the contact spring 112, the first actuation element 117 and the moving contact 114 to move in a direction opposite to the first direction L1. Accordingly, the moving contact 114 is coupled to the stationary contact 116. Owing to the contact between the moving contact 114 and the stationary contact 116, the moving contact 114 cannot continue to move in the direction opposite to the first direction L1. However, the second actuation element 118 may further move towards the stationary contact 116, which causes the contact spring 112 within the second actuation element 118 to be compressed. In this way, the contact pressure is exerted by the contact spring 112 onto the moving contact 114. The amount of compression of the contact spring 112 is referred to as a stroke of the contact spring 112.

[0031] The stroke is an important factor for the circuit breaker 1. For example, the moving contact 114 can be firmly coupled to the stationary contact 116. Owing to the presence of the contact pressure, a slight vibration or shaking of circuit breaker 1 will not interrupt the electrical connection between the moving contact 114 and the stationary contact 116. In addition, even if the moving contact 114 and the stationary contact 116 are worn out to some extent, the contact pressure allows both of the contacts to remain in good contact during the operation of the circuit breaker 1.

[0032] The stroke of the contact spring 112 should be adjusted within a proper range. If the stroke is too small, a desired contact pressure would not be ensured, which also influences the switching performance of the circuit breaker 1. If the stroke is too large, the force needed to switch off the circuit breaker 1 will be increased. In such a case, the circuit breaker 1 may not properly protect the main circuit from being damaged by the large current.

[0033] In conventional approaches, the length of the components, such as the second actuation element 118, is provided to be adjustable. For example, a threaded portion may be added to the components to allow the maintenance worker to change the length of the components. In this way, the stroke of the contact spring 112 can be adjusted. However, since the components are arranged within the circuit breaker 1, it would make the adjustment of the component more inconvenient. Moreover, since the adjustment may be conducted repeatedly in some cases, such an inconvenience will be more obvious.

[0034] An adjusting mechanism 10 of the circuit breaker 1 according to the present disclosure will be described in detail hereinafter. The adjusting mechanism 10 is configured to adjust the stroke of the contact spring 112.

[0035] As illustrated in Fig. 1, the adjusting mechanism 10 generally comprises an operating rod 102 and a transmitting rod 104 pivotally coupled to the operating rod 102. The operating rod 102 is controlled by the control mechanism 20 and configured to operate the moving contact 114 via the contact spring 112. As illustrated, the contact spring 112 is arranged between the operating rod 102 and the moving contact 114. The transmitting rod 104 is configured to drive the operating rod 102 to move towards the stationary contact 116 in the direction opposite to the first direction L1. The transmitting rod 104 is also configured to drive the operating rod 102 to move away from stationary contact 116 along the first direction L1. When the current through the circuit breaker 1 is detected as being too large, the control mechanism 20 will drive the transmitting rod 104 to pull the operating rod 102 away from the stationary contact 116. As a result, the moving contact 114 would be driven away from the stationary contact 116 by the operating rod 102 to detach from the stationary contact 116, such that the circuit breaker 1 is switched off.

[0036] As illustrated in Fig. 3, the adjusting mechanism 10 further includes an adjusting block 106 and a bracket 105. The adjusting block 106 is pivotally coupled to the transmitting rod 104 at a position different from the operating rod 102. As shown in Fig. 5, the adjusting block 106 comprises a thread hole 1062 extending along the first direction L1. As shown in Fig. 3, the bracket 105 includes a first supporting element 1051 and a second supporting element 1052 spaced from each other along the first direction L1. The first supporting element 1051 and the second supporting element 1052 each includes a through hole 122 extending along the first direction L1.

[0037] The adjusting mechanism 10 further includes an adjusting bolt 108. As best shown in Fig. 3, the adjusting bolt 108 sequentially extends through the through hole 122 of the first supporting element 1051, the thread hole 1062 of the adjusting block 106 and the through hole 122 of the second supporting element 1052 along the first direction L1. The adjusting bolt 108 comprising an external thread engaging with the thread hole 1062. The external thread may be rotated by an external torque to cause the adjusting bolt 108 to rotate about its axis A. Accordingly, the adjusting block 106 slides along the adjusting bolt 108 between the first supporting element 1051 and the second supporting element 1052.

[0038] According to example embodiments of the present disclosure, when the adjusting bolt 108 is rotated by the external torque, the adjusting bolt 108 will not be actuated to move along the first direction L1 or the direction opposite to the first direction L1. Moreover, since the adjusting bolt 108 penetrates through the through hole 122 of the first supporting element 1051 and the through hole 122 of the second supporting element 1052, the adjusting bolt 108 will not be actuated to move along a third direction L3 and a second direction L2 normal to the first direction L1. In other words, the adjusting bolt 108 can only be driven to rotate about the axis A. Since the adjusting bolt 108 is in a threaded connection with the adjusting block 106, the adjusting block 106 can be driven along the first direction L1 or the direction opposite to the first direction L1. The position of the adjusting block 106 on the adjusting bolt 108 can be changed accordingly. As both the adjusting block 106 and the operating rod 102 are coupled to the transmitting rod 104, the change of the position of the adjusting block 106 will cause the change of the position of the operating rod 102, which eventually brings about the change of the stroke of the contact spring 112. In this way, the stroke of the contact spring 112 can be adjusted in a convenient manner.

[0039] In some example embodiments, as illustrated in Fig. 3, the bracket 105 may further include a third supporting element 1053. The third supporting element 1053 as illustrated may be arranged between the first supporting element 1051 and the second supporting element 1052. In the shown embodiment, the third supporting element 1053 is configured to support the adjusting block 106 when the adjusting block 106 slides between the first supporting element 1051 and the second supporting element 1052. Since the adjusting block 106 can be supported by the third supporting element 1053, the movement of the adjusting block 106 can be achieved in a more reliable manner.

[0040] In some example embodiments, as illustrated in Fig. 5, the adjusting block 106 includes a block body 1064 and two wings 1066. The block body 1064 as shown is provided with the thread hole 1062 through which the adjusting bolt 108 extends. The wings 1066 are provided at both sides of the block body 1064 along the second direction L2 perpendicular to the first direction L1. The wings 1066 may be supported by the third supporting element 1053. The wings 1066 increase the contact area between the adjusting block 106 and the bracket 105 to allow the adjusting block 106 to move more steadily.

[0041] As shown in Fig. 5, in some example embodiments, each of the two wings 1066 may have a height h1 along the third direction L3 perpendicular to the first direction L1 and the second direction L2. The block body 1064 may have a height h2 along the third direction L3. In the illustrated embodiments, the height h1 of the wings 1066 may be smaller than the height h2 of the block body 1064. In this way, the adjusting block 106 can occupy a smaller space within the circuit breaker 1.

[0042] In some example embodiments, as shown in Fig. 5, each of the two wings 1066 may comprise a second thread hole 1068 extending along the third direction L3. Accordingly, as shown in Fig. 2, a fastening bolt 109 is provided to penetrate through the second thread hole 1068. In this way, the adjusting block 106 can be mounted onto the third supporting element 1053 of the bracket 105. The adjustment of the stroke of the contact spring 112 can be implemented by a maintenance worker or executed by a robot.

[0043] In some embodiments, the second thread hole 1068 may have a sectional area greater than the fastening bolt 109. In some embodiments, the fastening bolt 109 may be used to adjust the position of the adjusting block 106. The fastening bolt 109 may be actuated by an external force to cause adjusting block 106 to move to a desired position. In other embodiments, a maintenance worker may exert the force via a metal plate to cause the fastening bolt 109 to move. In this way, the position of the adjusting block 106 can also be adjusted.

[0044] In some example embodiments, when the adjusting bolt 108 is to be adjusted, the fastening bolt 109 should be loosened to allow the relative movement between third supporting element 1053 and the adjusting block 106. Then, the movement of the transmitting rod 104 will cause the operating rod 102 to move to a desired position. After the adjusting bolt 108 is moved to an appropriate position, the fastening bolt 109 would be screwed up. In this way, the stroke of the contact spring 112 is adjusted to a desired value.

[0045] In some example embodiments, each of the first supporting element 1051, the second supporting element 1052 and the third supporting element 1053 may comprise a plate. In this manner, the bracket 105 can be manufactured in a simple and cost-effective way.

[0046] In other example embodiments, the first supporting element 1051, the second supporting element 1052 and the third supporting element 1053 may be integrally formed as a single piece. In further example embodiments, the first supporting element 1051, the second supporting element 1052 and the third supporting element 1053 may be integrally formed on a housing of the circuit breaker 1.

[0047] In some example embodiments, as illustrated in Fig. 3, the adjusting bolt 108 may include a bolt head 1082 and a free end 1084 opposite to the bolt head 1082. The bolt head 1082 may abut the first supporting element 1051 while the free end 1084 abuts the second supporting element 1052. In some example embodiments, the free end 1084 may be coupled to a locknut 107. The locknut 107 is configured to rotate along with adjusting bolt 108 and can be used to restrict the movement of the adjusting bolt 108 along the first direction L1. Since the adjusting bolt 108 penetrates through the adjusting block 106, the rotation of the adjusting block 106 can be prevented. In this way, the wrapping of the adjusting block 106 can be avoided.

[0048] Moreover, owing to the fact that the bolt head 1082 may be rotated continuously, the embodiment allows an automatic adjustment which can be achieved by a robot.

[0049] In some example embodiments, a sensor (not shown) may be provided to detect whether the adjusted stroke of the contact spring 112 is within the desired range. If the detection shows that the stroke is too large or too small, the adjusting bolt 108 may be further adjusted to allow the stroke to fall in the desired range. In some example embodiments, these steps can be automatically carried out by a robot.

[0050] In some example embodiments, the bolt head 1082 may be a hexagonal bolt head. Since the screw pitch of the adjusting bolt 108 can be known, the relationship between the moving distance of the adjusting block 106 along the first direction L1 and the stroke of the contact spring 112 is definite. Thus, the relationship between the rotating degree of the hexagonal bolt head and stroke is also definite. In this way, by only rotating the adjusting bolt 108 to a desire degree, the stroke of the contact spring 112 can be adjusted precisely.

[0051] It is to be understood that the hexagonal bolt head is merely an example, without suggesting any limitation as to the scope of the disclosure. In other example embodiments, other shapes of the bolt head 1082 can be used.

[0052] In some example embodiments, the adjusting bolt 108 may include screw thread throughout the circumferential surface from the bolt head 1082 to the free end 1084.

[0053] In some example embodiments, as illustrated in Fig. 3, the first supporting element 1051 and the second supporting element 1052 may be parallel to each other. In this way, the bracket 105 can be made more compact. In other example embodiments, both the first supporting element 1051 and the second supporting element 1052 may be perpendicular to the third supporting element 1053.

[0054] In some example embodiments, as shown in Fig. 4, the first actuation element 117 of the circuit breaker 1 may include a protrusion 1172 and an annular shoulder 1174. The protrusion 1172 may be arranged at one end of the first actuation element 117. The annular shoulder 1174 may be arranged next to the protrusion 1172. As illustrated, the cylindrical chamber 1182 may be arranged adjacent to an end portion of the second actuation element 118. The cylindrical chamber 1182 may include an opening 1183 to allow the protrusion 1172, the shoulder 1174 and the contact spring 112 to be contained within the chamber 1182. The contact spring 112 as illustrated may be provided between the shoulder 1174 of the first actuation element 117 and an inner wall of the cylindrical chamber 1182. In this way, once the moving contact 114 is driven to touch the stationary contact 116, the shoulder 1174 is kept stationary. Subsequently, the further movement of the second actuation element 118 opposite to the first direction L1 will cause the compression of the contact spring 112.

[0055] In some example embodiments, the circuit breaker 1 may include three phases. In such an embodiment, each phase may include the adjusting mechanism 10 described above. It is to be understood that this is merely an example, without suggesting any limitation as to the scope of the disclosure. In other embodiments, the circuit breaker 1 may include other numbers of phases.

[0056] Compared with the conventional solution, the adjusting mechanism 10 for use with the circuit breaker 1 according to example embodiments of the present disclosure to allow the maintenance worker or the robot to carry out a precise, convenient and continuous adjustment of the stroke of the contact spring 112.

[0057] Although the present disclosure has been described in language specific to structural features and / or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims, which define the scope of protection.

Claims

1. An adjusting mechanism (10) of a circuit breaker (1), comprising: an operating rod (102) configured to operate a moving contact (114) of the circuit breaker (1) via a contact spring (112) arranged between the operating rod (102) and the moving contact (114); a transmitting rod (104) pivotally coupled to the operating rod (102) and configured to drive the operating rod (102) to move towards or away from a stationary contact (116) of the circuit breaker (1); characterised by an adjusting block (106) pivotally coupled to the transmitting rod (104) at a position different from the operating rod (102) and comprising a thread hole (1062); a bracket (105) comprising a first supporting element (1051) and a second supporting element (1052) spaced from the first supporting element (1051) along a first direction (L1), each of the first supporting element (1051) and the second supporting element (1052) comprising a through hole (122) extending along the first direction (L1); and an adjusting bolt (108) extending through the through hole (122) of the first supporting element (1051), the thread hole (1062) of the adjusting block (106), and the through hole (122) of the second supporting element (1052) sequentially along the first direction (L1), the adjusting bolt (108) comprising an external thread engaging with the thread hole (1062), such that when the adjusting bolt (108) is actuated to rotate about its axis (A), the adjusting block (106) slides along the first direction (L1) between the first supporting element (1051) and the second supporting element (1052).

2. The adjusting mechanism (10) of claim 1, wherein the bracket (105) further comprises: a third supporting element (1053) arranged between the first supporting element (1051) and the second supporting element (1052) and configured to support the adjusting block (106) when the adjusting block (106) slides between the first supporting element (1051) and the second supporting element (1052).

3. The adjusting mechanism (10) of claim 2, wherein the adjusting block (106) further comprises: a block body (1064) provided with the thread hole (1062); and two wings (1066) provided at both sides of the block body (1064) along a second direction (L2) perpendicular to the first direction (L1) and configured to be supported by the third supporting element (1053).

4. The adjusting mechanism (10) of claim 3, wherein each of the two wings (1066) has a height (h1) smaller than a height (h2) of the block body (1064) along a third direction (L3) perpendicular to the first direction (L1) and the second direction (L2).

5. The adjusting mechanism (10) of claim 3, wherein each of the two wings (1066) comprises a second thread hole (1068) extending along the third direction (L3) and configured to allow a fastening bolt (109) to penetrate therethrough to mount the adjusting block (106) onto the third supporting element (1053) of the bracket (105).

6. The adjusting mechanism (10) of claim 2, where each of the first supporting element (1051), the second supporting element (1052) and the third supporting element (1053) comprises a plate.

7. The adjusting mechanism (10) of claim 1, wherein a bolt head (1082) of the adjusting bolt (108) abuts the first supporting element (1051), and a free end (1084) of the adjusting bolt (108) opposite to the bolt head (1082) abuts the second supporting element (1052) and is coupled to a locknut (107).

8. The adjusting mechanism (10) of claim 7, wherein the bolt head (1082) is a hexagonal bolt head.

9. The adjusting mechanism (10) of claim 1, wherein the first supporting element (1051) and the second supporting element (1052) are parallel to each other.

10. A circuit breaker (1) comprising: a stationary contact (116); and a moving contact (114) configured to be operated by an operating rod (102) of an adjusting mechanism (10) of any of claims 1-9.

11. The circuit breaker (1) of claim 10, further comprising: a first actuation element (117) coupled to the moving contact (114); a second actuation element (118) coupled to the operating rod (102) of the adjusting mechanism (10); and a contact spring (112) having one end coupled to the first actuation element (117) and the other end coupled to the second actuation element (118).

12. The circuit breaker (1) of claim 11, wherein the first actuation element (117) comprises a protrusion (1172) at one end and an annular shoulder (1174) adjacent to the protrusion (1172), and wherein the second actuation element (118) comprises a cylindrical chamber (1182) adjacent to an end portion, the cylindrical chamber (1182) comprising an opening (1183) to allow the protrusion (1172), the shoulder (1174) and the contact spring (112) to be contained within the chamber (1182), the contact spring (112) being provided between the shoulder (1174) of the first actuation element (117) and an inner wall of the cylindrical chamber (1182).