A rotatable contact device for circuit breaker and low voltage circuit breaker

Abstract

The present invention provides a rotatable contact device of a circuit breaker and a low-voltage circuit breaker, and relates to the technical field of low-voltage power distribution. The rotatable contact device of the circuit breaker includes: a moving contact, having a first end and a second end, the first end is provided with a rotation center hole, and the second end is provided with a moving contact; a bracket, provided with two, and a positioning column for the rotation center hole to be sleeved is provided between the opposite surfaces of the two brackets, and the first end forms a clearance fit with the opposite surfaces of the two brackets; and a clamping mechanism for applying pressure to the first end. When the current overload causes the circuit breaker to change from a closed state to an open state, the present invention can make the position of the opposite surfaces of the two brackets have no friction force on the moving contact, thereby enabling the moving contact to rotate flexibly, so that the moving contact has no problem of getting stuck during the opening and closing process of the low-voltage circuit breaker, thereby improving the safety of the low-voltage circuit breaker.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage power distribution, and in particular to a rotatable contact device of a circuit breaker and a low-voltage circuit breaker. Background Art

[0002] Circuit breakers are an important part of power distribution equipment, mainly used in industrial low-voltage power systems to connect and disconnect currents in power grid circuits and protect lines and power equipment from overload, undervoltage, short circuit, single-phase grounding and other faults. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. Low-voltage circuit breakers are also called automatic switches, commonly known as air switches, which also refer to low-voltage circuit breakers. They are electrical appliances that have both manual switch functions and can automatically perform loss of voltage, undervoltage, overload, and short-circuit protection.

[0003] A rotatable contact device is usually provided in a low-voltage circuit breaker to ensure the stability of the contact resistance when the low-voltage circuit breaker is working normally. However, most rotatable contact devices are not flexible enough, resulting in the risk of jamming when the circuit breaker is in the opening and closing states.

[0004] For example, Fig.11 The present invention is a schematic structural diagram of a rotatable contact device in the prior art, which includes a first bracket 23, a second bracket 24, a first moving contact 26, a second moving contact 27, a spring 29, a spring seat 20 and a shaft 28. The first moving contact 26 and the second moving contact 27 are rotatably embedded in a groove 231 of the first bracket 23 and a groove 241 of the second bracket 24 through the shaft 28. The outer sides of the first bracket 23 and the second bracket 24 are respectively equipped with a spring 29 and a spring seat 20, and then the first bracket 23 and the second bracket 24 are integrally embedded in the groove at the end of the shaft 28. The pressure of the spring 29 acts on the outer sides of the first bracket 23 and the second bracket 24, so that there is contact pressure between the first bracket 23 and the first moving contact 26, and between the second bracket 24 and the second moving contact 27.

[0005] The defects of the rotatable contact device 10 in the prior art are as follows: the pressure of the spring 29 acts on the outer sides of the first bracket 23 and the second bracket 24. Since the first bracket 23 and the second bracket 24 have a certain rigidity and there is an assembly gap between the first bracket 23 and the first moving contact 26 and between the second bracket 24 and the second moving contact 27, the action force of the spring 29 must first overcome the reaction force formed by the slight deformation of the first bracket 23 and the second bracket 24 due to the assembly gap, and then there is contact pressure between the first bracket 23 and the first moving contact 26 and between the second bracket 24 and the second moving contact 27. Due to the reaction force of the first bracket 23 and the second bracket 24, the contact pressure between the first bracket 23 and the first moving contact 26 and between the second bracket 24 and the second moving contact 27 is unstable, which affects the stability of the contact resistance. In addition, there is a large area of ​​contact between the first bracket 23 and the first moving contact 26 and between the second bracket 24 and the second moving contact 27, and the friction resistance is large. In severe cases, the circuit breaker cannot be closed and the circuit breaker fails. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a rotatable contact device of a circuit breaker and a low-voltage circuit breaker.

[0007] In a first aspect, an embodiment of the present invention provides a rotatable contact device of a circuit breaker, comprising: The moving contact has a first end and a second end, wherein the first end is provided with a rotation center hole, and the second end is provided with a moving contact point; There are two brackets, and a positioning column for the rotating center hole to be sleeved is provided between the opposite surfaces of the two brackets, and the first end forms a clearance fit with the opposite surfaces of the two brackets; and The pressing mechanism is used to apply pressure to the first end.

[0008] Optionally, the rotatable contact device of the circuit breaker also includes a rotating shell and a rotating member, the positioning column includes two columnar bosses abutting each other, the two columnar bosses are respectively arranged on opposite surfaces of the two brackets, the rotating shell is rotatably connected to the positioning column through the rotating member, an open groove is provided on one side of the rotating shell, the first end is arranged in the rotating shell, and the second end extends from the open groove.

[0009] Optionally, protrusions are provided on the opposite surfaces of the opening groove, and a slot for the moving contact to pass through is formed between the opposite surfaces of the two protrusions. A blocking portion is provided on the bottom surface of the opening groove, and when the moving contact abuts against the static contact, there is a distance between the blocking portion and the moving contact.

[0010] Optionally, a first shaft is connected to the first end, the first shaft is parallel to the positioning column, and the clamping mechanism is used to apply pressure to the first shaft.

[0011] Optionally, the clamping mechanism includes a pressure plate, a spring and a second shaft. A accommodating groove is provided in the rotating shell, one end of the spring abuts against the bottom end of the accommodating groove, the other end of the spring extends out of the accommodating groove and abuts against one end of the pressure plate, the other end of the pressure plate is rotatably connected to the rotating shell through the second shaft, and the pressure plate abuts against the first shaft.

[0012] Optionally, the bottom end of the accommodating groove and the corresponding surface of the pressing plate are both provided with convex parts, and the two ends of the spring are respectively sleeved on the two convex parts.

[0013] Optionally, a third shaft is connected to the rotating shell, the third shaft is parallel to the first shaft, and two ends of the third shaft extend out of two side walls of the rotating shell respectively.

[0014] Optionally, a mounting foot is provided at one end of the bracket away from the columnar boss, and the mounting foot is used to be connected to the housing of the circuit breaker.

[0015] Optionally, the rotating member includes a fourth shaft and a sleeve, side shell parts are provided on both sides of the rotating shell, and the inner surfaces of the two side shell parts are provided with circular grooves for the sleeves to be embedded, and the two sleeves are respectively sleeved on both ends of the fourth shaft, and the positioning column is sleeved on the fourth shaft.

[0016] The beneficial effect of the rotatable contact device of the circuit breaker of the present invention is that when the low-voltage circuit breaker is in the closed state, the moving contact on the second end of the moving contact abuts against the static contact on the static contact, and at this time, the static contact can apply a pressure F1 to the second end of the moving contact, and at the same time, the clamping mechanism can apply a pressure F2 to the first end of the moving contact. From the balance of forces, it can be seen that the combined force of the pressure F1 and the pressure F2 is a pressure F3, and the pressure F3 can be converted into a force acting on the first end of the moving contact, and the force is converted into a force acting on the positioning column by the rotating center hole, thereby increasing the friction resistance between the inner wall of the rotating center hole and the outer peripheral surface of the positioning column, so that the moving contact It can reliably contact the two brackets, improve the stability of the moving contact and the static contact when they are in contact, and further improve the stability of the low-voltage circuit breaker in the closed state. When the current overload causes the low-voltage circuit breaker to change from the closed state to the open state, the moving contact rotates to separate the moving contact from the static contact, and because there is a clearance fit between the first end and the opposite surfaces of the two brackets, the rotating center hole on the first end can rotate around the positioning column, so that there is no friction between the positions of the opposite surfaces of the two brackets on the moving contact, and further the moving contact can rotate flexibly. Therefore, there is no problem of sticking of the moving contact during the opening and closing process of the low-voltage circuit breaker, thereby improving the safety of the low-voltage circuit breaker.

[0017] In a second aspect, an embodiment of the present invention further provides a low-voltage circuit breaker, including the rotatable contact device, static contact, release, arc extinguishing chamber and operating mechanism of the circuit breaker as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a rotatable contact device of a circuit breaker according to an embodiment of the present invention; Figure 2 It is a structural schematic diagram of a moving contact in a rotatable contact device of a circuit breaker according to an embodiment of the present invention; Figure 3 It is a schematic structural diagram of a bracket in a rotatable contact device of a circuit breaker according to an embodiment of the present invention; Figure 4 It is a front view of a moving contact in a rotatable contact device of a circuit breaker according to an embodiment of the present invention; Figure 5 It is a structural schematic diagram of a rotating member in a rotatable contact device of a circuit breaker according to an embodiment of the present invention; Figure 6 It is a schematic diagram of the installation of a rotating member in a rotatable contact device of a circuit breaker according to an embodiment of the present invention; Figure 7 It is a schematic structural diagram of a rotating shell in a rotatable contact device of a circuit breaker according to an embodiment of the present invention; Figure 8 It is a structural schematic diagram of a pressing mechanism in a rotatable contact device of a circuit breaker according to an embodiment of the present invention; Fig. 9 It is a structural schematic diagram of a low-voltage circuit breaker according to an embodiment of the present invention; Fig.10 It is a schematic diagram of a partial structure inside a low-voltage circuit breaker according to an embodiment of the present invention; Fig.11 The figure is a schematic diagram of the structure of a rotatable contact device in the prior art.

[0019] Explanation of the reference numerals in the accompanying drawings: 1. moving contact; 11. rotating center hole; 2. bracket; 21. columnar boss; 22. mounting foot; 3. first axis; 4. clamping mechanism; 41. pressure plate; 42. spring; 43. second axis; 5. rotating shell; 51. opening groove; 511. raised portion; 512. blocking portion; 52. side shell portion; 521. circular groove; 53. third axis; 54. accommodating groove; 6. rotating member; 61. fourth axis; 62. bushing; 100. static contact; 200. releaser; 300. arc extinguishing chamber; 400. operating mechanism. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0021] 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment", "some embodiments", "exemplarily" and "one embodiment" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or embodiment are included in at least one embodiment or embodiment of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or embodiment. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or embodiments in a suitable manner.

[0023] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0024] The Z axis in the accompanying drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z axis represents the up, and the negative direction of the Z axis represents the down; the X axis in the accompanying drawings represents the horizontal direction, and is designated as the left and right position, and the positive direction of the X axis represents the right side, and the negative direction of the X axis represents the left side; the Y axis in the accompanying drawings represents the front and back position, and the positive direction of the Y axis represents the front side, and the negative direction of the Y axis represents the back side. It should also be noted that the aforementioned Z axis, Y axis, and X axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation to the present invention.

[0025] An embodiment of the present invention provides a rotatable contact device for a circuit breaker, comprising a moving contact 1 having a first end and a second end, wherein the first end is provided with a rotation center hole 11, and the second end is provided with a moving contact point; two brackets 2 are provided, and a positioning column for the rotation center hole 11 to be sleeved is provided between the opposite surfaces of the two brackets 2, and the first end forms a clearance fit with the opposite surfaces of the two brackets 2; and a clamping mechanism 4 is used to apply pressure to the first end.

[0026] Specifically, Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the first end of the moving contact 1 is an end along the negative direction of the X-axis, the second end of the moving contact 1 is an end along the positive direction of the X-axis, the two brackets 2 are arranged along the Y-axis direction, and the two brackets 2 are arranged parallel to each other, the opposite surfaces of the two brackets 2 refer to the surfaces of the two brackets 2 facing each other respectively, and the two brackets 2 are fixedly installed at corresponding positions in the low-voltage circuit breaker housing. When the low-voltage circuit breaker is in a closed state, the moving contact on the second end of the moving contact 1 contacts the static contact on the static contact 100 in the low-voltage circuit breaker housing, and the current passes through the static contact 100, the moving contact 1 and the two brackets 2 in sequence, and then is connected to the external circuit through the wiring terminals on the release 200. When the current is overloaded, the release 200 triggers the operating mechanism 400 to perform an action, and the moving contact 1 rotates to separate the moving contact from the static contact. At the same time, the arc generated enters the arc extinguishing chamber 300 to extinguish the arc, completing the breaking operation.

[0027] It should be noted that the closed state of the low-voltage circuit breaker refers to the state when the moving contact and the static contact are in contact, the open state of the low-voltage circuit breaker refers to the state when the moving contact and the static contact are separated, the closing process of the low-voltage circuit breaker refers to the transition from the open state to the closed state, and the opening process of the low-voltage circuit breaker refers to the transition from the closed state to the open state.

[0028] In this optional embodiment, when the low-voltage circuit breaker is in the closed state, the moving contact on the second end of the moving contact 1 abuts against the static contact on the static contact 100. At this time, the static contact can apply a pressure F1 to the second end of the moving contact 1. At the same time, the clamping mechanism 4 can apply a pressure F2 to the first end of the moving contact 1. From the balance of forces, it can be seen that the combined force of the pressure F1 and the pressure F2 is a pressure F3. The pressure F3 can be converted into a force on the first end of the moving contact 1. The force is converted into a force of the rotating center hole 11 on the positioning column, thereby increasing the friction resistance between the inner wall of the rotating center hole 11 and the outer peripheral surface of the positioning column, so that the moving contact 1 and the two supports are in contact. The bracket 2 can be in reliable contact, which improves the stability of the moving contact and the static contact when they are in contact, and thus improves the stability of the low-voltage circuit breaker in the closed state. When the current overload causes the low-voltage circuit breaker to change from the closed state to the open state, the moving contact 1 rotates to separate the moving contact from the static contact, and because there is a clearance fit between the first end and the opposing surfaces of the two brackets 2, the rotating center hole 11 on the first end can rotate around the positioning column, so that the position of the opposing surfaces of the two brackets 2 does not have friction on the moving contact 1, and thus the moving contact 1 can rotate flexibly. Therefore, there is no problem of sticking of the moving contact 1 during the opening and closing process of the low-voltage circuit breaker, thereby improving the safety of the low-voltage circuit breaker.

[0029] Furthermore, the rotatable contact device of the circuit breaker also includes a rotating shell 5 and a rotating member 6. The positioning column includes two columnar bosses 21 abutting against each other. The two columnar bosses 21 are respectively arranged on opposite surfaces of the two brackets 2. The rotating shell 5 is rotatably connected to the positioning column through the rotating member 6. An open groove 51 is provided on one side of the rotating shell 5. The first end is arranged in the rotating shell 5, and the second end extends from the open groove 51.

[0030] In this optional embodiment, combined with Figure 1 , Figure 6 , Figure 7 and Figure 8 As shown, the rotating shell 5 is configured as a shell structure with an inner cavity structure, and the rotating member 6 can be a rotating shaft. By setting a through hole at the center of the cylindrical boss 21, the opposite end surfaces of the two cylindrical bosses 21 abut against each other to form a positioning column with an axis along the Y-axis direction, so that the formed positioning column has an axial hole for being sleeved on the rotating member 6, and the rotating shell 5 is connected to the operating mechanism 400, so that the rotating shell 5 can rotate with the rotating member 6 as the center when the operating mechanism 400 performs an action, so as to Figure 1 For example, when the current is overloaded, the operating mechanism 400 executes the action, driving the rotating shell 5 to rotate counterclockwise with the rotating part 6 as the center, so that the open groove 51 of the rotating shell 5 supports the moving contact 1, and the second end of the moving contact 1 rotates counterclockwise with the positioning column on the first end as the center, thereby separating the moving contact from the static contact, and the positioning column and the rotating part 6 are coaxially arranged, so that the rotation process of the rotating shell 5 and the moving contact 1 does not interfere with each other, thereby improving the smoothness of the moving contact 1 during the opening and closing process.

[0031] Optionally, protrusions 511 are provided on the opposite surfaces of the opening groove 51, and a slot for the moving contact 1 to pass through is formed between the opposite surfaces of the two protrusions 511. A blocking portion 512 is provided on the bottom surface of the opening groove 51. When the moving contact abuts against the static contact, there is a distance between the blocking portion 512 and the moving contact 1.

[0032] In this optional embodiment, combined with Figure 7 As shown, the two protrusions 511 are integrally formed on the opposite surfaces of the opening groove 51, and the blocking portion 512 is also integrally formed on the bottom surface of the opening groove 51. The blocking portion 512 can support the moving contact 1, so that the moving contact 1 completes the rotation and disconnecting operation, and makes the distance between the two side surfaces of the slot slightly larger than the thickness of the moving contact 1. In other words, the two side surfaces of the moving contact 1, that is, the two side surfaces of the moving contact 1 along the Y-axis direction, do not contact the corresponding side surfaces of the slot, so that there is no friction resistance between the moving contact 1 and the rotating shell 5, so that the moving contact 1 can rotate more flexibly, and when the moving contact abuts the static contact, that is, when the low-voltage circuit breaker is in the closed state, there is a distance between the blocking portion 512 and the moving contact 1, so that the moving contact 1 has an overtravel, so that the moving contact 1 and the static contact 100 are in reliable contact.

[0033] Furthermore, a first shaft 3 is connected to the first end, the first shaft 3 is parallel to the positioning column, and the pressing mechanism 4 is used to apply pressure to the first shaft 3 .

[0034] In this optional embodiment, combined with Figure 2 and Figure 3 As shown, the clamping mechanism 4 can be a spring-type clamping mechanism, a spring-type clamping mechanism, etc., so that pressure can always be applied to the first shaft 3 when the switch is in the opening and closing state.

[0035] Optionally, the clamping mechanism 4 includes a pressing plate 41, a spring 42 and a second shaft 43. A accommodating groove 54 is provided in the rotating shell 5. One end of the spring 42 abuts against the bottom end of the accommodating groove 54. The other end of the spring 42 extends out of the accommodating groove 54 and abuts against one end of the pressing plate 41. The other end of the pressing plate 41 is rotatably connected to the rotating shell 5 through the second shaft 43, and the pressing plate 41 abuts against the first shaft 3.

[0036] In this optional embodiment, combined with Figure 2 , Figure 4 and Figure 8 As shown, the two ends of the second shaft 43 are connected to the inner walls of the rotating shell 5 on both sides, and the corresponding end of the pressure plate 41 is integrally formed with a ring portion for the second shaft 43 to pass through. The spring 42 is in a compressed state in a natural state, so that when the switch is closed, the pressure plate 41 can always apply pressure F2 to the first shaft 3, so that the pressure F2 is converted into a force on the first end of the moving contact 1, and then the rotating center hole 11 applies a force to the positioning column, thereby increasing the force between the inner wall of the rotating center hole 11 and the outer peripheral surface of the positioning column, thereby increasing the friction resistance between the inner wall of the rotating center hole 11 and the outer peripheral surface of the positioning column, improving the reliability of the connection between the moving contact 1 and the two brackets 2, and then improving the stability of the moving contact and the static contact on the moving contact 1 when they are abutting in the closed state.

[0037] Furthermore, the bottom end of the accommodating groove 54 and the corresponding surface of the pressing plate 41 are both provided with convex portions, and the two ends of the spring 42 are respectively sleeved on the two convex portions.

[0038] In this optional embodiment, combined with Figure 8 As shown, the two protrusions can be integrally formed at the bottom end of the accommodating groove 54 and the corresponding surface of the pressure plate 41, respectively. By having the two ends of the spring 42 sleeved on the two protrusions, the two ends of the spring 42 can be limited, thereby improving the stability of the spring 42 when rotating with the rotating shell 5.

[0039] Optionally, a third shaft 53 is connected to the rotating shell 5 , the third shaft 53 is parallel to the first shaft 3 , and two ends of the third shaft 53 extend out of two side walls of the rotating shell 5 .

[0040] In this optional embodiment, combined with Figure 1 , Figure 6 and Figure 7 As shown, the third shaft 53 is provided along the Y-axis direction from the two side walls of the rotating shell 5, and the third shaft 53 is a driving shaft connected to the operating mechanism 400. Figure 1 For example, the execution action of the operating mechanism 400 can be applied to the third shaft 53, causing the rotating shell 5 to rotate counterclockwise to complete the process from closing to opening, and can also cause the rotating shell 5 to rotate clockwise to complete the process from opening to closing. It should be noted that the operating mechanism 400 adopts conventional technical means in this field, which will not be elaborated here.

[0041] Furthermore, a mounting foot 22 is provided at one end of the bracket 2 away from the columnar boss 21 , and the mounting foot 22 is used to be connected to the housing of the circuit breaker.

[0042] In this optional embodiment, combined with Figure 2 and Figure 3 As shown, the mounting foot 22 can be integrally formed at one end of the bracket 2 away from the columnar boss 21, and the mounting foot 22 can be integrally formed or provided with a mounting hole, so that the bracket 2 can be installed inside the housing of the circuit breaker using bolts. In other optional embodiments, the parts of the two brackets 2 close to the mounting feet 22 can be bent toward each other so that they are welded together against each other, thereby integrating the corresponding parts of the two brackets 2 into one, further improving the structural stability of the two brackets 2.

[0043] Optionally, the rotating member 6 includes a fourth shaft 61 and a sleeve 62. Side shell portions 52 are provided on both sides of the rotating shell 5. The inner surfaces of the two side shell portions 52 are provided with circular grooves 521 for the sleeves 62 to be embedded. The two sleeves 62 are respectively sleeved on both ends of the fourth shaft 61, and the positioning column is sleeved on the fourth shaft 61.

[0044] In this optional embodiment, combined with Figure 5 , Figure 6 and Figure 8 As shown, the circular groove 521 is integrally formed on the inner surface of the side shell portion 52, the axial hole of the positioning column is sleeved on the fourth shaft 61, the sleeve 62 is rotatably sleeved on the end of the fourth shaft 61, and the sleeve 62 is fixedly embedded in the circular groove 521. When the rotating shell 5 rotates, the sleeve 62 can rotate relative to the fourth shaft 61.

[0045] In other optional embodiments, the axial hole of the positioning column can be rotatably mounted on the fourth shaft 61, the sleeve 62 can be rotatably or fixedly mounted on the end of the fourth shaft 61, and the sleeve 62 can be slidably or fixedly embedded in the circular groove 521, which can also realize the rotation of the rotating shell 5 with the rotating center hole 11 as the center.

[0046] Combination Fig. 9 and Fig.10As shown, an embodiment of the present invention further provides a low-voltage circuit breaker, which includes a rotatable contact device of the circuit breaker as above, a static contact 100, a trip device 200, an arc extinguishing chamber 300 and an operating mechanism 400. Since it has the rotatable contact device of the circuit breaker as above, it has the same advantages as above.

[0047] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A rotatable contact device for a circuit breaker, characterized in that: include: A moving contact (1) having a first end and a second end, wherein the first end is provided with a rotation center hole (11), and the second end is provided with a moving contact point; Two brackets (2) are provided, and a positioning column for the rotation center hole (11) to be sleeved is provided between the opposing surfaces of the two brackets (2), and the first end forms a clearance fit with the opposing surfaces of the two brackets (2); and The pressing mechanism (4) is used to apply pressure to the first end.

2. The rotatable contact device of a circuit breaker according to claim 1, characterized in that: The rotatable contact device of the circuit breaker further comprises a rotating shell (5) and a rotating member (6); the positioning column comprises two columnar bosses (21) abutting against each other; the two columnar bosses (21) are respectively arranged on opposite surfaces of the two brackets (2); the rotating shell (5) is rotatably connected to the positioning column via the rotating member (6); an open slot (51) is arranged on one side of the rotating shell (5); the first end is arranged in the rotating shell (5) and the second end extends out of the open slot (51).

3. The rotatable contact device of the circuit breaker according to claim 2, characterized in that: The opposing surfaces of the opening groove (51) are each provided with a protrusion (511), and a slot for the moving contact (1) to pass through is formed between the opposing surfaces of the two protrusions (511). The bottom surface of the opening groove (51) is provided with a blocking portion (512), and when the moving contact abuts against the static contact, there is a distance between the blocking portion (512) and the moving contact (1).

4. The rotatable contact device of a circuit breaker according to claim 1, characterized in that: A first shaft (3) is connected to the first end, the first shaft (3) is parallel to the positioning column, and the pressing mechanism (4) is used to apply pressure to the first shaft (3).

5. The rotatable contact device of the circuit breaker according to claim 4, characterized in that: The clamping mechanism (4) comprises a pressing plate (41), a spring (42) and a second shaft (43); a receiving groove (54) is provided in the rotating shell (5); one end of the spring (42) abuts against the bottom end of the receiving groove (54); the other end of the spring (42) extends out of the receiving groove (54) and abuts against one end of the pressing plate (41); the other end of the pressing plate (41) is rotatably connected to the rotating shell (5) via the second shaft (43); and the pressing plate (41) abuts against the first shaft (3).

6. The rotatable contact device of a circuit breaker according to claim 5, characterized in that: The bottom end of the accommodating groove (54) and the corresponding surface of the pressing plate (41) are both provided with a convex block portion, and the two ends of the spring (42) are respectively sleeved on the two convex block portions.

7. The rotatable contact device of a circuit breaker according to claim 6, characterized in that: The rotating shell (5) is connected to a third shaft (53), the third shaft (53) is parallel to the first shaft (3), and two ends of the third shaft (53) respectively extend out of two side walls of the rotating shell (5).

8. The rotatable contact device of a circuit breaker according to claim 2, characterized in that: An end of the bracket (2) away from the columnar boss (21) is provided with a mounting foot (22), and the mounting foot (22) is used to be connected to a housing of a circuit breaker.

9. The rotatable contact device of a circuit breaker according to claim 2, characterized in that: The rotating member (6) comprises a fourth shaft (61) and a shaft sleeve (62); side shell portions (52) are provided on two side surfaces of the rotating shell (5); inner surfaces of the two side shell portions (52) are provided with circular grooves (521) for the shaft sleeves (62) to be embedded; the two shaft sleeves (62) are respectively sleeved on two ends of the fourth shaft (61); and the positioning column is sleeved on the fourth shaft (61).

10. A low voltage circuit breaker, characterized in that: The circuit breaker comprises a rotatable contact device according to any one of claims 1 to 9, a stationary contact (100), a tripper (200), an arc extinguishing chamber (300) and an operating mechanism (400).

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