Operating mechanism and circuit breaker

Abstract

The disclosure provides an operating mechanism, which comprises a housing; a transmission shaft parallel to the first pivot axis, penetrates through and protrudes from the moving contact assembly, and the moving contact assembly can pivot about the first pivot axis relative to the housing; a pull rod configured to move between a first position and a second position; a pivot plate mounted to be pivotable relative to the housing about a second pivot axis, the pivot plate being provided with a first hole pivotally connected with the transmission shaft, wherein, the pull rod is relatively pivotally connected with the pivot plate at the second hole of the pivot plate to drive the pivot plate to pivot about the second pivot axis, and further the pivot plate drives the moving contact assembly to pivot about the first pivot axis, during the movement of from the second position to the first position, the pull rod drives the moving contact assembly to contact with the fixed contact via the pivot plate, and during the movement of from the first position to the second position, the pull rod drives the moving contact assembly to pivot to separate from the fixed contact via the pivot plate, the second hole is closer to the second pivot axis than the first hole.

Description

[0001] The present disclosure claims the priority and benefits of the Chinese Patent Applications No. 202411189964.5, which was filed on August 28, 2024, the disclosure of which is incorporated herein by reference in its entirety as part of the present disclosure.TECHNICAL FIELD

[0002] The present disclosure relates to the electric field, in particular to an operating mechanism and a circuit breaker comprising the operating mechanism.BACKGROUND

[0003] Circuit breaker is a common electrical equipment, which is used to automatically cut off the electrical circuit when excessive abnormal current flows through it (for example, an overload or a short circuit) to protect the safety of equipment and personnel. The circuit breaker includes a fixed contact and a moving contact respectively connected to the terminal, both forming a generally closed breakpoint. When breaking is required, the moving contact is turned by the operating mechanism and then disconnected from the fixed contact, thus disconnecting the circuit. The arc extinguishing chamber is used to extinguish the arc generated between the moving contact and the fixed contact.

[0004] In recent years, the rapid development of new energy in China has put forward new requirements for distribution electrical equipment, especially for DC side circuit protection, and the requirements for circuit breakers with low tripping threshold and fast response. In order to meet the new demand, a new type of release design came into being. However, in the existing circuit breaker, the operation of the moving contact assembly is realized by a linkage mechanism, however, the linkage mechanism depends on the size of the moving contact.

[0005] When the opening distance needs to be increased without changing the connection mode, the moving contact needs to be lengthened, and at the same time, the moving contact bracket needs to be increased accordingly, and the rod length relationship of the linkage mechanism has changed. For example, for the double rocker mechanism, the ratio between the two rockers changes, which will lead to a smaller turning angle of the opening and closing. Since the turning angle becomes smaller, even if the moving contact is lengthened, the effect of effectively increasing the opening distance cannot be achieved.

[0006] Therefore, there is a need for an operating mechanism and a circuit breaker capable of solving the above problems.SUMMARY

[0007] The purpose of the present disclosure is to at least solve the shortcomings existing in the prior art, and the present disclosure provides an operating mechanism, including a housing; a transmission shaft parallel to a first pivot axis, wherein the transmission shaft penetrates through and protrudes from a moving contact assembly, and the moving contact assembly is pivotable about the first pivot axis relative to the housing; a pull rod configured to move between a first position and a second position; a pivot plate mounted to be pivotable relative to the housing about a second pivot axis, the pivot plate being provided with a first hole pivotally connected with the transmission shaft. The pull rod is pivotally connected with the pivot plate at the second hole of the pivot plate so as to drive the pivot plate to pivot about the second pivot axis, and thus the pivot plate driving the moving contact assembly to pivot about the first pivot axis. During the movement of the pull rod from the second position to the first position, the pull rod drives the moving contact assembly to contact with the fixed contact via the pivot plate, and during the movement of the pull rod from the first position to the second position, the pull rod drives the moving contact assembly to pivot to separate from the fixed contact via the pivot plate. The second hole is closer to the second pivot axis than the first hole.

[0008] For example, according to some embodiments of the present disclosure, the operating mechanism comprises two said transmission shafts which are symmetrical about the first pivot axis, and the first pivot axis coincides with the second pivot axis.

[0009] For example, according to some embodiments of the present disclosure, the operating mechanism further comprises a handle pivotally mounted to the housing and a transmission mechanism which couples the handle and the pull rod so that the pull rod can move between a first position and a second position by manipulating the handle to pivot.

[0010] For example, according to some embodiments of the present disclosure, the operating mechanism further comprises a tripping mechanism configured to perform tripping motion when the current flowing through the moving contact assembly is greater than a threshold value, thereby driving the pull rod to move from a first position to a second position.

[0011] For example, according to some embodiments of the present disclosure, the pull rod and the pivot plate are connected by a connector, the pull rod is located between the pivot plate and the moving contact assembly in the direction in which the first pivot axis extends, and the connector does not protrude from a first surface of the pull rod facing the moving contact assembly.

[0012] For example, according to some embodiments of the present disclosure, one end of the connector is fixedly connected with one of the pivot plates and the pull rod, and the other end of the connector is pivotally connected with the other of the pivot plate and the pull rod.

[0013] For example, according to some embodiments of the present disclosure, the pull rod is provided with a stepped hole at a side facing the moving contact assembly, and the connector comprises a connecting shaft and a flange positioned at one end of the connecting shaft and protruding radially from the connecting shaft, and the flange of the connector is accommodated in the stepped hole.

[0014] For example, according to some embodiments of the present disclosure, the connector is provided with a slot at its one end connected to the pivot plate, and the slot is at least partially located outside the second surface of the pivot plate far away from the pull rod in the direction in which the first pivot axis extends, and an insertion plate is inserted into the slot perpendicular to the first pivot axis to abut against the second surface.

[0015] For example, according to some embodiments of the present disclosure, the operating mechanism includes two pull rods and two pivot plates that are symmetrical respectively about a plane perpendicular to the first pivot axis.

[0016] For example, according to some embodiments of the present disclosure, the center line of the second hole, the center line of the first hole and the second pivot axis are parallel to each other and not in the same plane.

[0017] The present disclosure also provides a circuit breaker including the operating mechanism described in any of the preceding embodiments.

[0018] For example, according to some embodiments of the present disclosure, the circuit breaker includes a breaking unit, in which the moving contact assembly is arranged, the transmission shaft penetrates through the breaking unit, and other parts of the operating mechanism except the transmission shaft are arranged outside the breaking unit.

[0019] For example, according to some embodiments of the present disclosure, the circuit breaker further comprises additional breaking units, each of which comprises a fixed contact and a moving contact assembly, and the transmission shaft couples all the moving contact assemblies so that all the moving contact assemblies of the circuit breaker move synchronously.BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 shows a schematic perspective view of a part of the structure of a circuit breaker according to an embodiment of the present disclosure, in which a housing is hidden for illustration; Fig. 2 shows a perspective view of an operating mechanism according to an embodiment of the present disclosure; Figs. 3a - 3c show the operation schematic diagram of part of the structure shown in Fig. 1, wherein, Fig. 3a shows the circuit breaker in a closed state, Fig. 3b shows the circuit breaker in an open state, and Fig. 3c shows the circuit breaker in a tripped state; Fig. 4 shows a mating structure between a pivot plate and a pull rod according to an embodiment of the present disclosure; Fig. 5a shows a mating structure between a pivot plate and a pull rod according to another embodiment of the present disclosure, and Fig. 5b shows a structure of the pull rod according to Fig. 5a from another perspective; Fig. 6 shows a mating structure between a pivot plate and a pull rod according to another embodiment of the present disclosure; Fig. 7 shows a mating structure between a pivot plate and a pull rod according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] In order to make the purpose, solution and advantages of the technical solution of the present disclosure more clear, the technical solution of the embodiment of the present disclosure will be described clearly and completely with the accompanying drawings of specific embodiments of the present disclosure. Unless otherwise specified, the terms used herein have the ordinary meaning in the art. The same reference signs in the drawings represent same parts.

[0022] In the description of present disclosure, it should be noted that unless otherwise explicitly specified and limited, the terms "installation", "be connected" and "connection" should be broadly understood, for example, they can be fixed connection, detachable connection or integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected, indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood in specific situations.

[0023] The invention provides an operating mechanism and a circuit breaker. The circuit breaker may include breaking units (not shown), in particular, one, two, three and four breaking units corresponding to 1p, 2p, 3p and 4p breaking units. In the case where a plurality of breaking units is included, these breaking units may be identical. Each breaking unit may include a fixed contact (not shown) fixed to the circuit breaker housing, and a moving contact assembly 1 being movable relative to the fixed contact. In particular, the moving contact assembly 1 can be pivotally mounted to a breaking unit housing or a circuit breaker housing (not shown) about a first pivot axis A1, as shown in Fig. 1. The moving contact assembly 1 may include, for example, a single moving contact or two moving contacts as shown in Fig. 1. In the case of the two moving contacts, the two moving contacts are symmetrical about the first pivot axis A1, so that the two moving contacts can contact and separate from the corresponding fixed contact at the same time. The breaking unit can also include conventional components and structures such as arc extinguishing chamber and arc extinguishing grid. The circuit breaker can also be a circuit breaker that does not include a breaking unit, especially for a circuit breaker with a single break point. In this case, the moving contact assembly is directly pivotally mounted to the circuit breaker housing.

[0024] As shown in Fig. 1, the operating mechanism 2 includes a housing 25, which can be mounted and fixed to the housing of the breaking unit or the housing of the circuit breaker. The operating mechanism 2 may further include a transmission shaft 6 arranged parallel to the first pivot axis A1, in particular, the transmission shaft 6 may completely penetrate and protrude from the moving contact assembly, especially from the breaking unit (if any) in which the moving contact assembly is located, for example, for connection with the operating mechanism 2 arranged outside the breaking unit. Therefore, the moving contact assembly 1 can be pivoted by driving the transmission shaft 6 to rotate with respect to the first pivot axis A1.

[0025] In particular, for a circuit breaker including a plurality of breaking units, the transmission shaft 6 can be used to couple the plurality of breaking units, for transmitting force among the breaking units, especially for synchronizing the movement of the moving contact assembly 1 in the plurality of breaking units. In particular, for the moving contact assembly 1 with two moving contacts, two transmission shafts 6 can be provided, which is more conducive to transmitting the torque that makes the moving contact assembly 1 pivot, balancing the load and reducing the deformation of the transmission shafts 6 and the moving contact assembly 1. More preferably, the two transmission shafts 6 are arranged symmetrically about the first pivot axis A1.

[0026] The circuit breaker of the present disclosure also includes an operating mechanism 2 for operating the moving contact assembly 1. For example, the moving contact assembly 1 can be driven by a handle 22 of the operating mechanism 2, such as, via a linkage mechanism, so that the circuit breaker can be switched between the open state and the closed state. The handle 1 can pivot relative to the housing 25, for example, the handle 1 can move between the closed position and the open position. When the handle 1 moves to the closed position, the moving contact assembly 1 is in contact with the fixed contact, and the circuit breaker switches to the closed state. When the handle 1 moves to the open position, the moving contact assembly 1 separates from the fixed contact, and the circuit breaker switches to the open state.

[0027] Realizing the coupling of the handle 22 with the moving contact assembly 1 usually requires a linkage mechanism, for example, a double rocker mechanism. However, for circuit breakers with different requirements, the required opening distance is different. In order to achieve a large opening distance, the size of the moving contact assembly tends to be increased, thereby increasing the distance between the transmission shaft 6 and the first pivot axis A1. While the moving contact assembly often corresponds to one rocker of the double rocker mechanism, and the handle corresponds to the other rocker. When the length of one rocker (corresponding to the distance between the transmission shaft 6 and the first pivot axis A1) increases, the turning angle of the rocker decreases, so that even if the length of the moving contact increases, the effect of increasing the opening distance cannot be achieved.

[0028] In order to solve the above problems, one solution is to redesign the size of other links of the linkage mechanism, which requires designing the specific operating mechanism separately for each opening distance or each circuit breaker model, and requires manufacturing each specific component of the specific operating mechanism. Such solution is time-consuming and labor-intensive, and has high cost.

[0029] In this regard, the present disclosure proposes an improved operating structure 2, which can be used for different moving contact assemblies or breaking units without being adversely affected by the change of the size of the moving contact. Specifically, the operating mechanism 2 according to the present disclosure may include a handle 22 (as described above), a transmission mechanism 23, a pull rod 21, and a pivot plate 3.

[0030] The pull rod 21 and the handle 22 are coupled by a transmission mechanism 23, so that the pull rod 21 is movable between a first position (as shown in Fig. 3a) and a second position (as shown in Fig. 3b) by pivoting the handle 1. The transmission mechanism 23 can include multiple components, which is a well-known technology in the field, and is not the focus of present disclosure, so it will not be developed in detail here.

[0031] The pull rod 21 and the pivot plate 3 are shown in Fig. 2, the pull rod 21 is relatively pivotally connected to the pivot piece 3 at a second hole 32 of the pivot piece 3, for example by means of a connector 7 which will be described in detail later. The pivot plate 3 is mounted to be pivotable about the second pivot axis A2 relative to the housing 25, for example, by means of the pivot plate 3 being fixed to the housing 25 of the operating mechanism 2 by riveting, as shown in Figs 1 and 2, whereas the housing 25 can be mounted and fixed to the housing of the circuit breaker or the housing of the breaking unit (not shown). The second pivot axis A2 is parallel to the first pivot axis A1. In particular, for the symmetrical double-contacts structure shown in Figs 1 and 2, the second pivot axis A2 coincides with the first pivot axis A1, which is beneficial to ensure the state synchronization of the double-contacts structure. Thus, the movement of the pull rod 21 between the first position and the second position can pivot the pivot plate 3 relative to the housing 25.

[0032] Further, the pivot plate 3 is provided with a first hole 31 pivotally connected with the above-described transmission shaft 6. The transmission shaft 6 can pass through the first hole 31 to realize the pivotal connection. The number and position of the first holes 31 correspond to the number and position of the transmission shafts 6, for example, two holes arranged symmetrically about the first pivot axis A1 as shown in Figs. 1 and 2. Therefore, the pivot of the pivot plate 3 can drive the transmission shaft 6 to rotate about the first pivot axis A1, thereby driving the whole moving contact assembly to pivot about the first pivot axis A1.

[0033] Therefore, in connection with Fig. 3a and Fig. 3b, during the movement of the pull rod 21 from the second position to the first position, the pull rod 21 drives the moving contact assembly 1 to contact with the fixed contact via the pivot piece 3. During the movement of the pull rod 21 from the first position to the second position, the pull rod 21 drives the moving contact assembly 1 to pivot away from the fixed contact through the pivot plate 3.

[0034] In particular, the first hole 31 and the second hole 32 are separated from each other and do not coincide. Further, the second hole 32 is closer to the second pivot axis A2 than the first hole 31. Therefore, the pull rod 21 is not directly connected to the transmission shaft 6, and the moving contact assembly 1 pivots coaxially and synchronously with the pivot plate 3. The linkage mechanism for realizing the operation is originally composed of the transmission rod 21, the handle 22, the transmission mechanism 23 and the moving contact assembly 1, but in this structure of the present application, the moving contact assembly 1 is "removed" from the linkage mechanism and is improved to be composed of the transmission rod 21, the handle 22, the transmission mechanism 23 and the pivot plate 3. Therefore, the distance of the transmission shaft 6 relative to the first pivot axis A1 can be freely changed without affecting the linkage mechanism consisting of the transmission rod 21, the handle 22, the transmission mechanism 23 and the pivot plate 3. Furthermore, that operate mechanism can be adapted to the moving contact assembly with various sizes and various required distance are realized, only by changing one part, i.e. the pivot plate. Thus manpower and design time are saved, the cost is reduced, and has great practical and economic values.

[0035] Further, the operating mechanism 2 may include two pull rods and two pivot plates that are respectively symmetrical about a plane perpendicular to the first pivot axis A1. Therefore, the mechanism can be operated to exert greater force on the transmission shaft, so that the load distribution is more uniform and the deformation of the transmission shaft is reduced.

[0036] For example, as shown in Figs. 1 and 2, the center line of the second hole 32, the center line of the first hole 31 and the second pivot axis A2 are parallel to each other and not in the same plane. The second hole 32 is closer to the second pivot axis A2 than the first hole 31.

[0037] The disclosure also includes a tripping mechanism 24, and Fig. 3c shows a schematic diagram of the tripped state of the circuit breaker. The tripping mechanism 24 is configured to perform a tripping motion when the current flowing through the circuit breaker is greater than the threshold value, so as to drive the pull rod 21 to move from the first position to the second position, and thus pivoting the moving contact assembly 1 to separate from the fixed contact. The specific structure of the tripping mechanism 24 can adopt any tripping structure known in the field, and is not further limited here.

[0038] Next, with reference to Figs. 4 - 7, an alternative embodiment of the cooperation between the pull rod 21 and the pivot plate 3 will be described in detail. As shown in Figs. 4 - 7, the pull rod 21 can be pivotally engaged with the pivot plate 3 at the second hole 32 of the pivot plate 3 through the connector 7. For example, one end of the connector 7 can be fixedly connected with one of the pivoting plates 3 and the pull rod 21, and the other end of the connector 7 can be pivotally connected with the other of the pivoting piece 3 and the pull rod 21. The pull rod 21 may be located between the pivot plate 3 and the moving contact assembly 1 in the direction in which the first pivot axis A1 extends, as shown in Figs. 1 and 2. In the case where the breaking unit is provided, the pull rod 21 may be located between the pivot plate 3 and the breaking unit in the direction in which the first pivot axis A1 extends.

[0039] As shown in the embodiment shown in Figs. 4-6, the connector 7 may be a nail-like member, specifically, it may include a connecting shaft 71 and a flange 72 located at one end of the connecting shaft 71 and radially protruding from the connecting shaft 71. As shown in Fig. 4, the flange 72 abuts against the pull rod 21, and the connecting shaft 71 is inserted into the pull rod 21 and the pivot plate 3. For example, the connecting shaft 71 is in interference fit with the second hole 32.

[0040] More preferably, the connector 7 can be arranged not to protrude from the first surface 212 of the pull rod 21 facing the moving contact assembly 1, thereby reducing the risk of contact interference between the connector 7 and the moving contact assembly 1 or the breaking unit. In addition, it can also reduce the distance between the pull rod 21 and the moving contact assembly 1, thereby reducing the size of the circuit breaker. Specifically, as shown in Figs. 5a and 5b, the pull rod 21 is provided with a stepped hole 211 on a first surface 212 facing the moving contact assembly, and the flange 72 of the connector 7 is accommodated in the stepped hole 211, so that the connector 7 does not protrude from the first surface 212. Alternatively, as shown in Fig. 6, the flange 72 is abutted against the second surface 33 of the pivot plate 3 being far away from the pull rod 21, and the connecting shaft 71 is in interference fit with the corresponding hole of the pull rod 21, so that the free end of the connecting shaft 71 does not protrude from the first surface 212.

[0041] Fig. 7 shows that according to another embodiment of the present disclosure, the connector 7 may have a stepped shaft structure, and a slot 73 is provided at one end of the connector 7 connected to the pivot plate 3. The slot 73 is at least partially located outside the second surface 33 of the pivot plate 3 being far away from the pull rod 21 in the direction in which the first pivot axis A1 extends. And an insertion plate 8 is provided, which is inserted into the slot 73 perpendicular to the first pivot axis A1 to abut against the second surface 33. Particularly, the insertion plate 8 is inserted into the slot 73 exposed from the second surface 33, with interference fit. The other end of the connector 7 is in interference fit with the pull rod 21 and does not protrude from the first surface 212.

[0042] In addition, the circuit breaker according to the present disclosure may include a plurality of breaking units, for example, two, three and four, and the operating mechanism may be mounted and fixed to one breaking unit, for example. Each breaking unit may be identical, that is, each breaking unit includes a fixed contact and a moving contact assembly with the same structure and arrangement. The transmission shaft 6 described above passes through all the breaking units, especially through all the moving contact assemblies, so that all the moving contact assemblies of the circuit breaker move synchronously.

[0043] It should be understood that the above description is intended to be illustrative rather than limiting. For example, the above embodiments (and / or aspects thereof) may be used in combination with each other. In addition, many modifications may be made to adapt a particular situation or material to the teachings of present disclosure without departing from its scope. The functions or performances of various elements or modules described herein are only for illustration and are in no way restrictive, but are only exemplary embodiments. Many other embodiments and modifications within the spirit and scope of the claims will be apparent to those skilled in the art after reading the above description. Therefore, the scope of the present disclosure should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

[0044] In the appended claims, the terms "including" and "wherein" are used as simple English equivalents of the corresponding terms "comprising" and "in which". In addition, in the following claims, the terms "first", "second" and "third" are only used as labels, and no numerical requirements are intended to be imposed on their objects.

[0045] Reference numerals: 1 moving contact assembly, 2 operating mechanism, 21 pull rod, 211 stepped hole, 212 first surface, 22 handle, 23 transmission mechanism, 24 tripping mechanism, 25 housing, 3 pivot plate, 31 first hole, 32 second hole, 33 second surface, 6 transmission shaft, 7 connector, 71 connecting shafts, 72 flange, 73 slots, 8 insertion plate, A1 first pivot axis, A2 second pivot axis

Claims

1. An operating mechanism comprising a housing, a transmission shaft parallel to a first pivot axis, wherein the transmission shaft penetrates through and protrudes from a moving contact assembly, and the moving contact assembly is pivotable about the first pivot axis relative to the housing, a pull rod configured to move between a first position and a second position, a pivot plate mounted to be pivotable relative to the housing about a second pivot axis, the pivot plate being provided with a first hole pivotally connected with the transmission shaft, wherein, the pull rod is pivotally connected with the pivot plate at the second hole of the pivot plate so as to drive the pivot plate to pivot about the second pivot axis, and thus the pivot plate driving the moving contact assembly to pivot about the first pivot axis, during the movement of the pull rod from the second position to the first position, the pull rod drives the moving contact assembly to contact with the fixed contact via the pivot plate, and during the movement of the pull rod from the first position to the second position, the pull rod drives the moving contact assembly to pivot to separate from the fixed contact via the pivot plate, the second hole is closer to the second pivot axis than the first hole.

2. The operating mechanism according to claim 1, wherein, the operating mechanism comprises two said transmission shafts which are symmetrical about the first pivot axis, and the first pivot axis coincides with the second pivot axis.

3. The operating mechanism according to claim 2, wherein, the operating mechanism further comprises a handle pivotally mounted to the housing and a transmission mechanism which couples the handle and the pull rod so that the pull rod can move between a first position and a second position by manipulating the handle to pivot.

4. The operating mechanism according to claim 3, wherein, the operating mechanism further comprises a tripping mechanism configured to perform tripping motion when the current flowing through the moving contact assembly is greater than a threshold value, thereby driving the pull rod to move from a first position to a second position.

5. The operating mechanism according to claim 1, wherein, the pull rod and the pivot plate are connected by a connector, the pull rod is located between the pivot plate and the moving contact assembly in the direction in which the first pivot axis extends, and the connector does not protrude from a first surface of the pull rod facing the moving contact assembly.

6. The operating mechanism according to claim 5, wherein, one end of the connector is fixedly connected with one of the pivot plates and the pull rod, and the other end of the connector is pivotally connected with the other of the pivot plate and the pull rod.

7. The operating mechanism according to claim 5, wherein, the pull rod is provided with a stepped hole at a side facing the moving contact assembly, and the connector comprises a connecting shaft and a flange positioned at one end of the connecting shaft and protruding radially from the connecting shaft, and the flange of the connector is accommodated in the stepped hole.

8. The operating mechanism according to claim 5, wherein, the connector is provided with a slot at its one end connected to the pivot plate, and the slot is at least partially located outside the second surface of the pivot plate far away from the pull rod in the direction in which the first pivot axis extends, and an insertion plate is inserted into the slot perpendicular to the first pivot axis to abut against the second surface.

9. The operating mechanism according to any one of claims 1-8, wherein, the operating mechanism includes two pull rods and two pivot plates that are symmetrical respectively about a plane perpendicular to the first pivot axis.

10. The operating mechanism according to any one of claims 1-8, wherein, the center line of the second hole, the center line of the first hole and the second pivot axis are parallel to each other and not in the same plane.

11. A circuit breaker comprising the operating mechanism according to any one of claims 1-10.

12. The circuit breaker according to claim 11, comprises a breaking unit, in which the moving contact assembly is arranged, the transmission shaft penetrates through the breaking unit, and other parts of the operating mechanism except the transmission shaft are arranged outside the breaking unit.

13. The circuit breaker according to claim 12, wherein the circuit breaker further comprises additional breaking units, each of which comprises a fixed contact and a moving contact assembly, and the transmission shaft couples all the moving contact assemblies so that all the moving contact assemblies of the circuit breaker move synchronously.

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