Circuit breaker

Abstract

A circuit breaker comprises a shell, a manual driving mechanism, a first arc extinguishing mechanism, a second arc extinguishing mechanism, a moving contact bridge, a first static contact and a second static contact, the manual driving mechanism, the first arc extinguishing mechanism, the second arc extinguishing mechanism and the moving contact bridge are arranged in the shell, and the first static contact and the second static contact are arranged corresponding to the two ends of the moving contact bridge respectively. The contact support and the moving contact bridge are arranged between the manual driving mechanism and the wiring structure, the first static contact and the first arc extinguishing mechanism are arranged between the contact support and the manual driving mechanism, and the second static contact and the second arc extinguishing mechanism are arranged between the contact support and the wiring structure. The moving contact bridge comprises a contact rotating part and two contact swinging parts which are respectively connected with the contact rotating part, the two contact swinging parts respectively rotate by taking the contact rotating part as a center, and the two contact swinging parts are not symmetrically arranged by taking the center of the contact rotating part as a center, so that the moving contact bridge has the characteristics of reasonable layout and compact structure.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a circuit breaker. Background Technology

[0002] Circuit breakers are commonly used to control the connection and disconnection of circuits, automatically cutting off the circuit in case of faults to protect the circuit and load. As the application environments of circuit breakers become more diverse and complex, the requirements for their breaking capacity and other capabilities are increasing. However, existing circuit breakers are limited by space and structure, making it difficult to improve their breaking capacity. Furthermore, the unreasonable placement of the locking mechanism leads to an increase in the circuit breaker's size. In addition, the short-circuit protection mechanism and overload protection mechanism of existing circuit breakers are located on the same side of the operating mechanism, resulting in poor reliability and excessive size due to this unreasonable layout. Utility Model Content

[0003] The purpose of this utility model is to overcome at least one defect of the prior art and provide a circuit breaker.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A circuit breaker includes a housing, and a manual drive mechanism, an operating mechanism, a contact mechanism, an arc extinguishing mechanism, and a wiring structure disposed within the housing. The manual drive mechanism is connected to the operating mechanism, and the operating mechanism is connected to a moving contact bridge. The manual drive mechanism can drive the operating mechanism to rotate the moving contact bridge to contact or separate it from the stationary contact.

[0006] The contact mechanism includes a moving contact bridge mounted on a contact support, and two stationary contacts respectively positioned at both ends of the moving contact bridge. The wiring structure includes two plug-in mechanisms electrically connected to the two stationary contacts. The circuit breaker includes two arc-extinguishing mechanisms, with the two stationary contacts being a first stationary contact and a second stationary contact, and the two arc-extinguishing mechanisms being a first arc-extinguishing mechanism and a second arc-extinguishing mechanism.

[0007] The manual drive mechanism and the wiring structure are respectively arranged at opposite ends of the housing along a first direction, and the two plug-in mechanisms of the wiring structure are arranged side by side along a second direction, which is perpendicular to the first direction.

[0008] The contact support and moving contact bridge are disposed between the manual drive mechanism and the wiring structure; the operating mechanism is disposed between the manual drive mechanism and the contact support; the first stationary contact and the first arc extinguishing mechanism are disposed between the contact support and the manual drive mechanism; and the second stationary contact and the second arc extinguishing mechanism are disposed between the contact support and the wiring structure.

[0009] The moving contact bridge includes a contact rotating part and two contact swinging parts respectively connected to the contact rotating part. The two contact swinging parts rotate around the contact rotating part, and the two contact swinging parts are not symmetrically arranged around the center of the contact rotating part.

[0010] Preferably, the circuit breaker includes a short-circuit protection mechanism and an overload protection mechanism, with at least a portion of the short-circuit protection mechanism and at least a portion of the overload protection mechanism disposed opposite each other on both sides of the operating mechanism along a second direction, wherein one stationary contact is connected to one of the plug-in mechanisms via the short-circuit protection mechanism, and the other stationary contact is connected to the other plug-in mechanism via the overload protection mechanism.

[0011] Preferably, the two plug-in mechanisms are a first plug-in mechanism and a second plug-in mechanism, the second stationary contact, the second arc extinguishing mechanism and the short-circuit protection mechanism are arranged side by side along the second direction, the short-circuit protection mechanism includes an iron core and a drive coil, the drive coil is electrically connected between the first stationary contact and the corresponding first plug-in mechanism, and at least the iron core of the short-circuit protection mechanism can extend to one side of the operating mechanism to trigger the operating mechanism to trip;

[0012] The overload protection mechanism includes a bimetallic strip, which has a fixed end and a movable end that is bent around the fixed end as the rotation center. The fixed end of the bimetallic strip is fixedly connected to a second stationary contact, and the bimetallic strip is electrically connected to a corresponding second plug-in mechanism. The second arc extinguishing mechanism is disposed between the fixed end of the bimetallic strip and the drive coil. The movable end of the bimetallic strip extends to one side of the operating mechanism to trigger the operating mechanism to trip.

[0013] Preferably, the operating mechanism includes a rotating component that is rotatably mounted, and a latch and a jumper that are rotatably mounted on the contact support. The latch and the jumper engage with each other. The jumper is connected to the rotating component via a first link, and the rotating component is connected to the manual drive mechanism via a second link. The contact support is connected to the energy storage spring.

[0014] Preferably, the first arc-extinguishing mechanism, the first stationary contact, and the rotating component are arranged side by side along the second direction.

[0015] Preferably, it further includes a first arc-starting plate and a second arc-starting plate, a first arc-extinguishing mechanism is located between the first arc-starting plate and the first stationary contact, a second arc-extinguishing mechanism is located between the second arc-starting plate and the second stationary contact, and the first arc-starting plate and the second arc-starting plate are connected by a second conductive element.

[0016] Preferably, the circuit breaker further includes a current transformer and a circuit board. A communication plug-in mechanism is connected to the circuit board and is disposed between two plug-in mechanisms. The circuit board is provided with a power-taking clip and a transformer terminal. The transformer terminal is connected to the current transformer. One of the plug-in mechanisms is provided with a first wire passing through the middle of the current transformer, and the other plug-in mechanism is provided with a second wire. The power-taking clip is connected to the second wire.

[0017] Preferably, the circuit breaker further includes a locking mechanism, which includes a locking member. The housing is provided with a locking hole, and the locking member is provided with a locking protrusion. A locking spring drives the locking protrusion of the locking member to extend out of the housing from the locking hole. The locking member can retract into the housing under force. The locking member is arranged on one side of the first arc extinguishing mechanism along the second direction.

[0018] Preferably, the operating mechanism includes a rotating member disposed between the first arc extinguishing mechanism and the locking member. The rotating member is provided with a stop portion. When the moving contact bridge contacts the stationary contact, the stop portion rotates to the moving path of the locking member to block the locking member, so that the locking protrusion cannot retract into the housing.

[0019] Preferably, the first arc extinguishing mechanism includes a plurality of parallel arc extinguishing grids. The end of the arc extinguishing grid in the first arc extinguishing mechanism that is away from the moving contact bridge is inclined away from the locking mechanism along the second direction, so that the arc extinguishing grids in the first arc extinguishing mechanism are respectively inclined to the first direction.

[0020] Preferably, the included angle between the two contact swing portions is 100-170 degrees.

[0021] Preferably, the moving contact bridge is rotatably mounted on the contact support, the contact rotating part is provided with a contact rotating hole that is rotatably connected to the contact support, and the contact support is provided with two contact springs that are respectively connected to the two contact swing parts. The two contact springs respectively drive the contact bridge swing part to press against the stationary contact.

[0022] Preferably, the contact support is provided with a support shaft, and the contact rotation hole of the contact rotation part is sleeved on the support shaft. The contact rotation hole includes two contact hole walls that are disposed opposite to each other on both sides of the support shaft. The distance between the two contact hole walls is greater than the diameter of the support shaft, so that the support shaft and the contact rotation hole can rotate and slide together.

[0023] Preferably, the contact support includes a disc-shaped support rotating part, with a support rotating shaft in the middle. The support rotating part has two support swing grooves corresponding to the two contact swing parts. Each support swing groove has a support spring groove and a limiting boss on both sides along the contact support rotation direction. The support spring groove is used to accommodate the contact spring. One end of the contact spring is limited in the support spring groove, and the other end is connected to the corresponding contact swing part. Before the moving contact bridge contacts the stationary contact, the contact spring drives the contact bridge swing part to press against the limiting boss. After the moving contact bridge contacts the stationary contact, the contact spring drives the contact bridge swing part to press against the corresponding stationary contact.

[0024] Preferably, the support spring groove is arc-shaped, and the contact spring is bent and disposed in the support spring groove.

[0025] Preferably, a limiting boss corresponding to one of the contact swing parts forms the groove wall of the support spring groove corresponding to the other contact swing part. A support boss is provided between the other limiting boss and the support spring groove. The support boss is used to form the side wall of the support groove. The support shaft is disposed in the support groove. The support groove is used to accommodate the contact rotation part. The inner diameter R2 of the support groove is larger than the outer diameter R1 of the contact rotation part.

[0026] The circuit breaker of this invention features a moving contact bridge where the two contact swing parts are not symmetrically arranged around the center of the contact rotation part, creating an oblique angle between them. When one contact swing part is parallel to the first direction, the other contact swing part tilts to one side along the second direction. This design allows for full utilization of the space within the circuit breaker housing, leaving room for other mechanisms, resulting in a rational layout and compact structure. Furthermore, the circuit breaker includes short-circuit protection and overload protection mechanisms. One stationary contact is connected to one insertion mechanism via the short-circuit protection mechanism, and the other stationary contact is connected to another insertion mechanism via the overload protection mechanism. At least some of the short-circuit protection and overload protection mechanisms are arranged opposite each other on both sides of the operating mechanism along the second direction. The second stationary contact, the second arc-extinguishing mechanism, and the short-circuit protection mechanism are arranged side-by-side along the second direction, providing comprehensive functionality and a rational layout.

[0027] In addition, the operating mechanism includes a rotating component that is rotatably mounted, and a latch and a trip latch that are rotatably mounted on the contact support. The latch and the trip latch engage with each other. The trip latch is connected to the rotating component via a first link, and the rotating component is connected to the manual drive mechanism via a second link. The connection between the second link, the rotating component, the first link, and the trip latch allows the two stationary contacts to be positioned opposite each other on both sides of the contact support, reducing the width of the circuit breaker and making the layout more reasonable.

[0028] In addition, the rotating part can also be used to cooperate with the locking mechanism to block the locking part when the circuit breaker is closed, so that the locking protrusion cannot retract into the housing, and the circuit breaker in the closed state cannot be inserted into or pulled out of the cabinet, thereby improving electrical safety and avoiding electric shock. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the circuit breaker of this utility model when it is tripped;

[0030] Figure 2 This is a schematic diagram of the circuit breaker of this utility model when it is closed;

[0031] Figure 3 This is a schematic diagram of the structure of the moving contact and the stationary contact when they are separated.

[0032] Figure 4 This is a schematic diagram of the structure of the moving contact and the stationary contact of this utility model;

[0033] Figure 5 This is the main circuit when the moving contact and the stationary contact of this utility model come into contact;

[0034] Figure 6 This is the main circuit when the moving contact and the stationary contact of this utility model are separated;

[0035] In the picture:

[0036] 1. Housing 213. Moving contact part

[0037] 3 Manual drive mechanism 214 Moving contact bridge

[0038] 4. Wiring structure 215 contact rotating part

[0039] 5 Locking mechanism 216 Contact swing section

[0040] 8. Short circuit protection mechanism 217. Contact rotation hole

[0041] 9. Overload protection mechanism 221 First stationary contact

[0042] 11 Insertion end 222 Second stationary contact

[0043] 12 operating terminals 240 support bosses

[0044] 23 Energy storage spring 242 Support spring section

[0045] 24-contact support 243-contact spring

[0046] 25 latches, 244 supports hinges

[0047] 26-inch buckle, 245-inch support groove

[0048] 41 Plug-in mechanism 246 Support rotating part

[0049] 42 Current transformer 247 Supports swing slot

[0050] 43 circuit board 248 supports spring slot

[0051] 44 Power Clip 249 Limiting Boss

[0052] 45 Communication plug-in mechanism 252 Locking rotating part

[0053] 46 First wire 253 Locking part

[0054] 47 Second conductor 254 Locking short circuit section

[0055] 48 Exhaust Channels 255 Overload Locking Section

[0056] 51 Locking component 272 First link

[0057] 52 Unlocking parts 273 Rotating parts

[0058] 53 Transmission component 274 Stop part

[0059] 61 First arc-extinguishing mechanism 275 Second connecting rod

[0060] 62 Second arc extinguishing mechanism 311 Handle rotating part

[0061] 81 Magnetic Yoke 312 Handle Operating Section

[0062] 82 iron core 313 handle push part

[0063] 83 drive coil 411 first insertion mechanism

[0064] 92 Bimetallic Strip 412 Second Insertion Mechanism

[0065] 93 First conductive element 420 current transformer terminal

[0066] 94 Adjusting Screw 531 Transmission Rotating Part

[0067] 532 Transmission and Drive Unit

[0068] 533 Transmission unlocking unit

[0069] 534 First Unlocking Department

[0070] 535 Second Unlocking Section

[0071] 711 First Arc-Inducing Plate

[0072] 712 Second Arc-Inducing Plate

[0073] 713 Second conductive element Detailed Implementation

[0074] The specific embodiments of the circuit breaker of this utility model are further described below with reference to the accompanying drawings. The circuit breaker of this utility model is not limited to the descriptions in the following embodiments.

[0075] like Figure 1-2 As shown, the circuit breaker in this embodiment includes a housing 1, and a manual drive mechanism 3, an operating mechanism, a contact mechanism, an arc-extinguishing mechanism, a protection mechanism, and a wiring structure 4, all disposed within the housing 1. The contact mechanism includes a moving contact bridge 214 and a stationary contact. The wiring structure 4 is connected to the contact mechanism and is used to connect the power supply and the load. The manual drive mechanism 3 is connected to the operating mechanism, and the operating mechanism is connected to the moving contact bridge 214. The manual drive mechanism 3 extends outside the housing 1. By operating the manual drive mechanism 3, the operating mechanism can be driven to rotate and contact or separate the moving contact bridge 214 from the stationary contact, thereby realizing the closing and opening of the circuit breaker. The arc-extinguishing mechanism is disposed near the contact mechanism and is used to extinguish the arc generated by the moving contact bridge 214 and the stationary contact. The protection mechanism triggers the operating mechanism to trip when a circuit fault occurs, such as overload or short circuit. The operating mechanism drives the moving contact bridge 214 to separate from the stationary contact, thereby protecting the circuit. In this embodiment, the protection mechanism includes a short-circuit protection mechanism 8 and an overload protection mechanism 9, which are used to implement short-circuit protection and overload protection, respectively. The operating mechanism is typically a four-bar or five-bar linkage, including a latch 25 and a trip latch 26 that engage with each other. When the latch 25 and trip latch 26 are locked together, the manual drive mechanism 3 drives the contact bridge 214 to contact the stationary contact via the operating mechanism. In the event of an overload or short circuit, the short-circuit protection mechanism 8 or the overload protection mechanism 9 is triggered, pushing the latch 25 to release the latch engagement between the latch 25 and trip latch 26, causing the operating mechanism to disengage and the moving contact bridge 214 to separate from the stationary contact, thus protecting the circuit. The circuit breaker in this embodiment is a plug-in type, typically installed in a 1U high cabinet. The circuit breaker also includes a locking mechanism 5, which, after the circuit breaker is installed in the cabinet, engages with the cabinet to lock the circuit breaker within the cabinet. These are all existing technologies in the field and will not be described in detail further.

[0076] like Figure 1 As shown, one improvement in this embodiment is the layout of the circuit breaker. The circuit breaker is wired in a rear-in, rear-out configuration instead of a front-in, rear-out configuration. That is, the input and output terminals of the first-pole circuit are both located at one end of the circuit breaker's length. At the same time, the first-pole circuit uses a double-break control system consisting of a moving contact bridge 214 and two stationary contacts to control the opening and closing of the main circuit, thereby improving the circuit breaker's breaking capacity.

[0077] To facilitate the explanation of the structure and layout of the circuit breaker in this embodiment, the circuit breaker in this embodiment has a first direction, a second direction and a third direction that are perpendicular to each other. The first direction is parallel to the length direction of the circuit breaker, the second direction is parallel to the width direction of the circuit breaker, and the third direction is parallel to the thickness direction of the circuit breaker. The third direction in the figure is perpendicular to the direction of the paper.

[0078] like Figure 1-2 As shown, the contact mechanism of the circuit breaker in this embodiment includes a moving contact bridge 214 disposed on the contact support 24, and two stationary contacts respectively disposed at both ends of the moving contact bridge 214. The wiring structure 4 includes two plug-in mechanisms 41, which can be simultaneously fitted onto their respective corresponding plug-in components to achieve connection with the power supply and the load. The two plug-in mechanisms 41 are electrically connected to the two stationary contacts respectively. The two ends of the moving contact bridge 214 and the two stationary contacts form a double-break control for the on / off of the main circuit. The corresponding circuit breaker includes two arc-extinguishing mechanisms. The two stationary contacts are a first stationary contact 221 and a second stationary contact 222, and the two arc-extinguishing mechanisms are a first arc-extinguishing mechanism 61 and a second arc-extinguishing mechanism 62.

[0079] The manual drive mechanism 3 and the wiring structure 4 are respectively disposed at opposite ends of the housing 1 along the first direction. The two ends of the housing 1 are the insertion end 11 and the operation end 12, respectively. Two plug-in mechanisms 41 are disposed at the insertion end 11 and are arranged side by side along the second direction. The manual drive mechanism 3 is disposed at the operation end 12. The contact support 24 and the moving contact bridge 214 are disposed between the manual drive mechanism 3 and the wiring structure 4. The operation mechanism is disposed between the manual drive mechanism 3 and the contact support 24. The first stationary contact 221 and the first arc extinguishing mechanism 61 are disposed between the contact support 24 and the manual drive mechanism 3. The second stationary contact 222 and the second arc extinguishing mechanism 62 are disposed between the contact support 24 and the wiring structure 4.

[0080] The moving contact bridge 214 includes a contact rotating part 215 and two contact swing parts 216 respectively connected to the contact rotating part 215. The two contact swing parts 216 rotate around the contact rotating part 215. The two contact swing parts 216 are not symmetrically arranged around the contact rotating part 215, that is, the two contact swing parts 216 are non-centrally symmetrical structures.

[0081] In this embodiment of the circuit breaker, the two contact swing portions 216 of the moving contact bridge 214 are not symmetrically arranged with respect to the center of the contact rotation portion 215, so that the two contact swing portions 216 are at an angle to each other. When one of the contact swing portions 216 is parallel to the first direction, the other contact swing portion 216 is tilted to one side along the second direction. This allows the circuit breaker to make full use of the space inside the housing and leave space in the housing to accommodate other mechanisms. It has the characteristics of reasonable layout and compact structure.

[0082] In this embodiment, the connector is a busbar, and the connector mechanism 41 is a bus clamp. The bus clamp includes two opposing clamping pieces, which clamp the busbar from both sides, allowing the contact mechanism to connect to the power supply and load via the two bus clamps. The busbar, as a connector, is typically installed inside a cabinet. The circuit breaker is installed inside the cabinet, and its connector mechanism 41 clamps the busbar. Using a connector mechanism 41 connected to the busbar connector mechanism 41 offers convenient operation and avoids the problems of excessive wires and exposed wires, reducing the risk of electric shock. Of course, in other embodiments, the connector mechanism 41 can also be a connector plate extending outside the housing 1, and the connector inside the cabinet can be a bus clamp; the only requirement is that the connector mechanism 41 and the connector inside the cabinet are connected in a compatible manner.

[0083] like Figure 1-2 As shown, the protection mechanism includes a short-circuit protection mechanism 8 and an overload protection mechanism 9. At least a portion of the short-circuit protection mechanism 8 and at least a portion of the overload protection mechanism 9 are arranged opposite each other on both sides of the operating mechanism along a second direction. When a corresponding overload or short-circuit fault occurs, they are triggered to drive the operating mechanism to trip, i.e., to drive the latch 25 of the operating mechanism, causing the latch 25 to release its latching engagement with the trip latch 26. One stationary contact is connected to one of the plug-in mechanisms 41 via the short-circuit protection mechanism 8, and the other stationary contact is connected to another plug-in mechanism 41 via the overload protection mechanism 9. By arranging the short-circuit protection mechanism 8 and the overload protection mechanism 9 opposite each other on both sides of the operating mechanism, rather than on the same side, the layout is more rational and facilitates the connection of the stationary contacts to the corresponding protection mechanisms.

[0084] Preferably, in this embodiment, the second stationary contact 222, the second arc extinguishing mechanism 62, and the short-circuit protection mechanism 8 are arranged side by side along the second direction, and at least the iron core 82 of the short-circuit protection mechanism 8 can extend to one side of the operating mechanism to push the latch 25 and trigger the operating mechanism to disengage.

[0085] Furthermore, such as Figure 5-6As shown, the two insertion mechanisms 41 are respectively the first insertion mechanism 411 and the second insertion mechanism 412. The short-circuit protection mechanism 8 includes an iron core 82 and a drive coil 83. The drive coil 83 is electrically connected between the first stationary contact 221 and the corresponding first insertion mechanism 411. When the short-circuit current passing through the drive coil 83 meets the threshold, it can drive the iron core 82 to move, triggering the operating mechanism to trip. The overload protection mechanism 9 includes a bimetallic strip 92, which includes a fixed end and a movable end bent around the fixed end as the rotation center. The fixed end of the bimetallic strip 92 is fixedly connected to the second stationary contact 222. The movable end of the bimetallic strip 92 extends to one side of the operating mechanism to push the latch 25, triggering the operating mechanism to trip. The bimetallic strip 92 is electrically connected to the corresponding second insertion mechanism 412. The second arc-extinguishing mechanism 62 is disposed between the fixed end of the bimetallic strip 92 and the drive coil 83. The iron core 82, with one end used to trigger the tripping of the operating mechanism, and the movable end of the bimetallic strip 92 are arranged opposite each other on both sides of the operating mechanism along the second direction. That is, the fixed end of the bimetallic strip 92, the second stationary contact 222, the second arc-extinguishing mechanism 62, and the short-circuit protection mechanism 8 are arranged side-by-side in sequence along the second direction. The movable end of the bimetallic strip 92 and the contact support 24 are arranged side-by-side along the second direction. Preferably, the movable end of the bimetallic strip 92 cooperates with a pull rod on the latch 25, and the bimetallic strip 92 pulls the latch 25 via the pull rod to trigger the tripping of the operating mechanism. The overload protection mechanism 9 also includes an adjusting screw 94 disposed on the housing 1, which can move along the second direction and push the bimetallic strip 92, causing the bimetallic strip 92 to change its initial position.

[0086] like Figure 2 As shown, the operating mechanism of this embodiment includes a rotating component 273 that is rotatably mounted, and a latch 25 and a jumper 26 that are rotatably mounted on the contact support 24. The latch 25 and the jumper 26 are engaged. The jumper 26 is connected to the rotating component 273 through a first connecting rod 272. The rotating component 273 is connected to the manual drive mechanism 3 through a second connecting rod 275. The contact support 24 is connected to the energy storage spring 23. Thus, the contact support 24, the latch 25, and the jumper 26 form a four-bar linkage structure. The second connecting rod 275, the first connecting rod 272, and the rotating component 273 mainly play a transmission role, so that the two stationary contacts can be arranged opposite each other on both sides of the contact support 24, reducing the width of the circuit breaker and making the layout more reasonable.

[0087] The manual drive mechanism 3 in this embodiment includes a rotatable handle. The handle is connected to the rotating component 273 via a second connecting rod 275. The handle can rotate between the closed and open positions. When the handle is rotated to the closed position, the drive operating structure causes the moving contact bridge 214 to contact the stationary contact. When the handle is rotated to the open position, the drive operating structure causes the moving contact bridge 214 to separate from the stationary contact. The handle, through the operating mechanism, causes the two ends of the moving contact bridge 214 to contact and separate from the two stationary contacts respectively. When the two ends of the moving contact bridge 214 are in contact with the two stationary contacts respectively, the energy storage spring 23 is locked in the energy storage state by the interlocking latch 25 and the jump latch 26. When the protection mechanism releases the latch 25 and the jump latch 26, the energy storage spring 23 is released, causing the energy storage spring 23 to drive the contact bridge 214 support 24 to separate the moving contact bridge 214 from the two stationary contacts. Of course, as another embodiment, the manual drive mechanism 3 can also be a button.

[0088] Preferably, the first arc-extinguishing mechanism 61, the first stationary contact 221, and the rotating component 273 are arranged side by side along the second direction.

[0089] like Figure 1-2 As shown, the latch 25 includes a latch rotating part 252 coaxially arranged with the contact support 24, and a latch overload part 255 connected to the latch rotating part 252. The latch overload part 255 is provided with a pull rod that cooperates with the overload protection mechanism 9. When the moving contact bridge 214 contacts the stationary contact, the latch overload part 255 is located on the side of the latch rotating part 252 away from the overload protection mechanism 9.

[0090] Furthermore, when the moving contact bridge 214 contacts the stationary contact, the pull rod includes a first pull portion that coincides with the contact support 24 along a third direction projection, and a second pull portion located outside the contact support 24 and cooperating with the bimetallic strip 92. The length of the first pull portion is greater than the length of the second pull portion. By setting the locking overload portion 255 on the side away from the overload protection mechanism 9, and setting the pull rod on the side of the operating mechanism, it is ensured that the overload protection mechanism 9 can reliably trigger the operating mechanism to disengage.

[0091] Specifically, the latch 25 includes a latch rotating part 252 coaxially arranged with the contact support 24, and a latch locking part 253, a latch short-circuit part 254, and a latch overload part 255 respectively connected to the latch rotating part 252. The latch locking part 253 is used to lock the trip latch 26. The latch overload part 255 is provided with a pull rod that cooperates with the overload protection mechanism 9. When the overload current meets the threshold, the overload protection mechanism 9 drives the latch 25 to rotate through the pull rod, so that the latch locking part 253 moves away from the trip latch 26 and unlocks the trip latch 26. The latch short-circuit part 254 cooperates with the short-circuit protection mechanism 8. When the short-circuit current meets the threshold, the short-circuit protection mechanism 8 drives the latch 25 to rotate, so that the latch locking part 253 moves away from the trip latch 26 and unlocks the trip latch 26. Furthermore, the locking part 253, the short-circuit part 254, and the overload part 255 are all located on the side of the rotating part 252 away from the overload protection mechanism 9. The locking part 253 and the overload part 255 are connected, and the jump buckle 26 is located between the locking part 253 and the short-circuit part 254.

[0092] In another embodiment (not shown in the figure), the operating mechanism includes a rotating component 273, and a latch 25 and a snap fastener 26 rotatably mounted on the rotating component 273. The latch 25 and snap fastener 26 are interlocked. The snap fastener 26 is connected to the manual drive mechanism 3 via a second link 275. The rotating component 273 is connected to the contact support 24 via a first link 272. The rotating component 273 is also connected to the energy storage spring 23. Thus, the rotating component 273, the latch 25, and the snap fastener 26 form a four-bar linkage. The manual drive mechanism 3 drives the two ends of the moving contact bridge 214 to contact and separate from the two stationary contacts through the operating mechanism. When the two ends of the moving contact bridge 214 are in contact with the two stationary contacts, the interlocking latch 25 and snap fastener 26 lock the energy storage spring 23 in the energy storage state. When the protection mechanism releases the interlocking of the latch 25 and snap fastener 26, it releases the energy storage spring 23, causing the energy storage spring 23 to drive the rotating component 273 to separate the moving contact bridge 214 from the two stationary contacts. In this embodiment, the short-circuit protection mechanism 8 and the overload protection mechanism 9 are also positioned closer to the rotating member 273, located on both sides of the rotating member 273 in the second direction, so as to drive the latch 25 to release its latching engagement with the trip latch 26. For example, the overload protection mechanism 9 is arranged side by side with the first stationary contact 221 and the first arc extinguishing mechanism 61 in the second direction, and the overload protection mechanism 9 is arranged side by side with the contact support 24 in the second direction, etc.

[0093] like Figure 1-2As shown in Figures 5-6, the circuit breaker also includes two arc-initiating mechanisms corresponding to the two stationary contacts, which cooperate with the corresponding stationary contacts to introduce the arc into the corresponding arc-extinguishing mechanism. The two arc-initiating mechanisms are a first arc-initiating plate 711 and a second arc-initiating plate 712. The first arc-extinguishing mechanism 61 is located between the first arc-initiating plate 711 and the first stationary contact 221, and the second arc-extinguishing mechanism 62 is located between the second arc-initiating plate 712 and the second stationary contact 222. The first arc-initiating plate 711 and the second arc-initiating plate 712 are connected by a second conductive element 713. In this way, the electric arc jumps from the moving contact bridge 214 to the first arc-initiating plate 711 and the second arc-initiating plate 712 and moves to the first arc-extinguishing mechanism 1 and the second arc-extinguishing mechanism 2 respectively. At this time, the current circuit does not flow through the moving contact bridge 214, and becomes the first stationary contact 1, the first arc-initiating plate 711, the second conductive element 713, the second arc-initiating plate 712 and the second stationary contact 2. Moreover, the circuit forms two breaks between the first stationary contact 1 and the first arc-initiating plate 711, and between the second stationary contact 2 and the second arc-initiating plate 712, which can accelerate the extinction of the electric arc.

[0094] like Figure 1-2 As shown, the circuit breaker also includes a current transformer 42 and a circuit board 43. The circuit board 43 is disposed between two plug-in mechanisms 41, and a communication plug-in mechanism 45 is connected to the circuit board 43. The communication plug-in mechanism 45 is disposed between the two plug-in mechanisms 41. The circuit board 43 is provided with a power-taking clip 44 and a transformer terminal 420. The transformer terminal 420 is connected to the current transformer 42. One of the plug-in mechanisms 41 is provided with a first wire 46 passing through the middle of the current transformer 42, and the other plug-in mechanism 41 is provided with a second wire 47. The power-taking clip 44 is connected to the second wire 47. The circuit board 43 has an exhaust channel 48 on a third-direction side. A communication plug-in mechanism 45 connected to the circuit board 43 is disposed between the exhaust channel 48 and one of the plug-in mechanisms 41. The circuit board 43 can not only monitor the current, temperature, on / off status and other parameters inside the product in real time, but also communicate with a host computer through an external communication device.

[0095] like Figure 3-4As shown, the moving contact bridge 214 includes a contact rotating part 215 and two contact swing parts 216 respectively connected to the contact rotating part 215. The two contact swing parts 216 rotate around the contact rotating part 215. Each contact swing part 216 has a moving contact part 213 that contacts the corresponding stationary contact. The angle between the lines connecting the moving contact parts 213 of the two contact swing parts 216 to the center of the contact rotating part 215 is 100-170 degrees. Preferably, the angle between the lines connecting the moving contact parts 213 of the two contact swing parts 216 to the center of the contact rotating part 215 is 120-160 degrees. Of course, the two contact swing parts 216 can also be separately arranged, with each contact swing part 216 disposed on the contact support 24 and then connected by a conductor. All of these are within the protection scope of this utility model.

[0096] Furthermore, the movable contact bridge 214 is rotatably mounted on the contact support 24, and the contact spring 243 is located between the movable contact bridge 214 and the contact support 24, fixing the movable contact bridge 214 to the contact support 24. The contact rotating part 215 is provided with a contact rotating hole 217 rotatably connected to the contact support 24. The contact support 24 is provided with two contact springs 243 respectively connected to the two contact swing parts 216. The two contact springs 243 respectively drive the contact swing parts 216 to press against the contact support 24. When the contact support 24 rotates, it drives the two contact swing parts 216 to contact and separate from the stationary contact. When the contact swing parts 216 contact the stationary contact, they are blocked by the stationary contact after contact. The contact support 24 continues to move and separates from the contact swing parts 216, so that the contact springs 243 drive the contact swing parts 216 to press against the stationary contact.

[0097] Furthermore, the contact support 24 is provided with a support shaft 244, and the contact rotation hole 217 of the contact rotation part 215 is fitted onto the support shaft 244. The contact rotation hole 217 has a certain length, allowing the support shaft 244 and the contact rotation hole 217 to rotate and slide together. The contact rotation hole 217 includes two contact hole walls that are arranged opposite to each other on both sides of the support shaft 244. The distance between the two contact hole walls is greater than the diameter of the support shaft 244, allowing the contact rotation hole 217 to slide on the support shaft 244. Since the rotation axis of the moving contact bridge 214 is not completely fixed, the rotation center of the moving contact bridge 214 can be adaptively adjusted to ensure that the moving and stationary contacts can always maintain contact when the circuit is closed. Moreover, it can also avoid the problem of the contact position of the moving contact bridge 214 and the stationary contact shifting due to assembly tolerances and contact wear.

[0098] Furthermore, the contact support 24 has a support groove 245 in the middle, and the support shaft 244 is disposed in the support groove 245. The support groove 245 is used to accommodate the contact rotating part 215. The inner diameter R2 of the support groove 245 is larger than the outer diameter R1 of the contact rotating part 215. When the contact rotating hole 217 of the moving contact bridge 214 slides on the support shaft 244, space can be left for the moving contact bridge 214.

[0099] Furthermore, the contact support 24 includes a disc-shaped support rotation part 246, which has a radially protruding support spring part 242 connected to the energy storage spring 23. A support rotating shaft 244 is located in the middle of the support rotation part 246. The support rotation part 246 has two support swing grooves 247 corresponding to the two contact swing parts 216. Each support swing groove 247 has a support spring groove 248 and a limiting boss 249 on both sides along the rotation direction of the contact support 24. The support spring groove 248 is used for... The contact spring 243 is accommodated. One end of the contact spring 243 is limited in the support spring groove 248, and the other end is connected to the corresponding contact swing part 216. The contact spring 243 drives the contact swing part 216 to press against the limiting boss 249. When the contact support 24 drives the moving contact bridge 214 to contact the stationary contact, the contact support 24 continues to rotate, causing the contact swing part 216 to separate from the corresponding limiting boss 249, and causing the contact swing part 216 to press against the corresponding contact spring 243. The contact spring 243 drives the contact swing part 216 to press against the corresponding stationary contact.

[0100] Preferably, the support spring groove 248 is arc-shaped, and the contact spring 243 is bent and disposed in the support spring groove 248. The arc-shaped support spring groove 248 can accommodate a larger contact spring 243.

[0101] Preferably, the limiting boss 249 corresponding to one of the contact swing portions 216 forms the groove wall of the support spring groove 248 corresponding to the other contact swing portion 216, giving the limiting boss 249 multiple functions. A support boss 240 is provided between the other limiting boss 249 and the support spring groove 248, and the support boss 240 forms the sidewall of the support groove 245. Support spring portion 242

[0102] like Figure 1-2As shown, the housing 1 is provided with a locking mechanism 5, which includes a locking member 51. The housing 1 is provided with a locking hole, and the locking member 51 is provided with a locking protrusion 513. The locking spring drives the locking protrusion 513 of the locking member 51 to extend from the locking hole to the outside of the housing 1 to lock the circuit breaker to the cabinet. The locking member 51 is able to overcome the elastic force of the locking spring when subjected to force, so that the locking protrusion 513 retracts into the housing 1 and releases the lock with the cabinet. The cabinet is provided with a cabinet locking hole. When the circuit breaker is inserted into the cabinet and installed in place, the locking hole on the housing 1 corresponds to the cabinet locking hole. The locking protrusion 513 of the locking member 51 extends into the cabinet locking hole to lock the circuit breaker in the cabinet. The locking member 51 is arranged on one side of the first arc extinguishing mechanism 61 along the second direction. Since the contact swing parts 216 at both ends of the moving contact bridge 214 are not centrally symmetrically arranged, the moving contact bridge 214 and the contact swing part 216 corresponding to the locking member 51 can tilt. This allows the arc extinguishing grid plate of the first arc extinguishing mechanism 61 corresponding to the contact swing part 216 to tilt, so that the first arc extinguishing mechanism 61 leaves space for the locking member 51 in the housing 1, avoiding increasing the size of the circuit breaker in the second direction. It has the characteristics of compact structure and small size.

[0103] like Figure 2 As shown, the rotating part 273 of the operating mechanism is positioned between the first arc-extinguishing mechanism 61 and the locking part 51. The rotating part 273 has a stop part 274. When the moving contact bridge 214 contacts the stationary contact, the stop part 274 rotates into the moving path of the locking part 51 to block the locking part 51, preventing the locking protrusion 513 from retracting into the housing 1. By keeping the locking protrusion 513 protruding outside the housing 1, the circuit breaker in the closed state cannot be inserted into or removed from the cabinet, thereby improving electrical safety and preventing electric shock. When the circuit breaker is open, the stop part 274 of the rotating part 273 rotates to a position that avoids the locking part 51. Through the inclined arc-extinguishing grid of the first arc-extinguishing mechanism 61, space can be provided for both the locking part 51 and the rotating part 271, allowing the stop part 274 on the rotating part 271 to prevent the locking part 51 from retracting into the housing 1.

[0104] Preferably, the first arc-extinguishing mechanism 61 includes a plurality of parallel arc-extinguishing grids. The end of the arc-extinguishing grid in the first arc-extinguishing mechanism 61 away from the moving contact bridge 214 is inclined away from the locking mechanism 5 along the second direction, so that the arc-extinguishing grids in the first arc-extinguishing mechanism 61 are respectively inclined with respect to the first direction. The second arc-extinguishing mechanism 62 also includes a plurality of parallel arc-extinguishing grids. The direction of the arc-extinguishing grids in the second arc-extinguishing mechanism 62 is parallel with the first direction. The inclined arrangement of the arc-extinguishing grids in the first arc-extinguishing mechanism 61 can not only leave more space for the locking member 51 and the rotating member 271, but also achieve a better arc-extinguishing effect.

[0105] The locking mechanism 5 in this embodiment includes a locking member 51, a transmission member 53, and an unlocking member 52, as well as a locking spring connected to the locking member 51. The locking spring drives the locking protrusion 513 of the locking member 51 to extend from the locking hole to the outside of the housing 1 to lock the circuit breaker to the cabinet. Under the drive of the unlocking member 52, the transmission member 53 can push the locking member 51 to overcome the force of the locking spring and retract the locking protrusion 513 back into the housing 1. In this embodiment, the locking member 51 is linearly movable along the second direction, the transmission member 53 is rotatably disposed inside the housing 1, and the unlocking member 52 is rotatably disposed at the operating end 12. Manually operating the unlocking member 52 can drive the transmission member 53 to press down on the locking member 51, causing the locking member 51 to overcome the force of the locking spring and retract into the housing 1. After the force disappears, the locking spring drives the fixed member 51 to reset. Obviously, in other embodiments, the locking member 51 can also be rotatably disposed, and the locking member 51 and the transmission member 53 can also be integrally disposed, etc.

[0106] Another embodiment of the unlocking mechanism 51 is that the locking mechanism 51 is unlocked by a handle of the manual drive mechanism 3, thus eliminating the need for an unlocking mechanism 52. For example, the handle can rotate between the closed position, the open position, and the unlocked position. The open position is located between the closed and unlocked positions. After reaching the open position, the handle can continue to rotate away from the closed position to the unlocked position. When the handle reaches the unlocked position, it can directly or indirectly drive the locking mechanism 51, causing the locking protrusion 513 to retract into the housing 1. In this embodiment, the handle indirectly drives the locking mechanism 51 through the transmission mechanism 53.

[0107] In another embodiment, the locking mechanism can also be unlocked by the handle and the unlocking member 52 respectively. The transmission member 53 includes a transmission rotating part 531 and a transmission pushing part 532 and a transmission unlocking part 533 respectively connected to the transmission rotating part 531. The transmission pushing part 532 and the transmission unlocking part 533 rotate about the transmission rotating part 531. The transmission pushing part 532 is located on the side of the locking sliding part 511 of the locking member 51 and is used to push the locking driven part 512 to drive the locking member 51 to retract into the housing 1. The transmission unlocking part 533 includes a first direction. A first unlocking part 534 is provided on the side of the unlocking member 52, and a second unlocking part 535 is provided on the first unlocking part 534 near the side of the unlocking member 52. The second unlocking part 535 cooperates with the unlocking member 52. When the unlocking member 52 rotates counterclockwise, it pushes the second unlocking part 535 to drive the transmission member 53 to rotate clockwise. The transmission pushing part 532 of the transmission member 53 drives the locking member 51 to retract into the housing 1. The manual drive mechanism 3 can push the first unlocking part 534 so that the transmission pushing part 532 of the transmission member 53 drives the locking member 51 to retract into the housing 1.

[0108] The manual drive mechanism 3 includes a handle, which includes a handle rotating part 311 and a handle operating part 312 and a handle pushing part 313 respectively connected to the handle rotating part 311. The handle operating part 312 extends outside the housing 1 for manual operation. The handle operating part 312 can drive the handle pushing part 313 to rotate around the handle rotating part 311. When the handle drives the circuit breaker to open, the handle rotates counterclockwise and pushes the first unlocking part 534, which drives the transmission part 53 to rotate clockwise. The transmission pushing part 532 pushes the locking driven part 512, causing the locking part 51 to move along the second direction and drive the locking protrusion 513 to retract into the housing 1.

[0109] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0110] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A circuit breaker comprising a housing (1), and a manual drive mechanism (3), an operating mechanism, a contact mechanism, an arc extinguishing mechanism and a wiring structure (4) arranged in the housing (1), the manual drive mechanism (3) being connected with the operating mechanism, the operating mechanism being connected with a movable contact bridge (214), the manual drive mechanism (3) being capable of driving the operating mechanism to rotate the movable contact bridge (214) to contact or separate from a stationary contact, characterized in that: the contact mechanism comprises the movable contact bridge (214) arranged on a contact support (24), and two stationary contacts arranged respectively at two ends of the movable contact bridge (214), the wiring structure (4) comprises two plug-in mechanisms (41) electrically connected with the two stationary contacts respectively, the circuit breaker comprises two arc extinguishing mechanisms, the two stationary contacts are a first stationary contact (221) and a second stationary contact (222) respectively, and the two arc extinguishing mechanisms are a first arc extinguishing mechanism (61) and a second arc extinguishing mechanism (62) respectively, the manual drive mechanism (3) and the wiring structure (4) are arranged respectively at opposite ends of the housing (1) along a first direction, the two plug-in mechanisms (41) of the wiring structure (4) are arranged side by side along a second direction, and the second direction is perpendicular to the first direction, the contact support (24) and the movable contact bridge (214) are arranged between the manual drive mechanism (3) and the wiring structure (4), the operating mechanism is arranged between the manual drive mechanism (3) and the contact support (24), the first stationary contact (221) and the first arc extinguishing mechanism (61) are arranged between the contact support (24) and the manual drive mechanism (3), and the second stationary contact (222) and the second arc extinguishing mechanism (62) are arranged between the contact support (24) and the wiring structure (4); the movable contact bridge (214) comprises a contact rotating part (215) and two contact swinging parts (216) connected with the contact rotating part (215) respectively, the two contact swinging parts (216) rotate around the contact rotating part (215) as a center, and the two contact swinging parts (216) are not arranged symmetrically with the contact rotating part (215) as a center. The circuit breaker comprises a short-circuit protection mechanism (8) and an overload protection mechanism (9), at least part of the short-circuit protection mechanism (8) and at least part of the overload protection mechanism (9) are arranged oppositely along the second direction at two sides of the operating mechanism, one of the stationary contacts is connected with one of the plug-in mechanisms (41) through the short-circuit protection mechanism (8), and the other stationary contact is connected with the other plug-in mechanism (41) through the overload protection mechanism (9).

2. The circuit breaker of claim 1, wherein: ​ 3. The circuit breaker of claim 2, wherein: The two plug-in mechanisms (41) are respectively a first plug-in mechanism (411) and a second plug-in mechanism (412), the second static contact (222), the second arc extinguishing mechanism (62) and the short-circuit protection mechanism (8) are arranged side by side along a second direction, the short-circuit protection mechanism (8) comprises an iron core (82) and a drive coil (83), the drive coil (83) is electrically connected between the first static contact (221) and the corresponding first plug-in mechanism (411), at least the iron core (82) of the short-circuit protection mechanism (8) can extend to one side of the operating mechanism to trigger the operating mechanism to trip; The overload protection mechanism (9) comprises a bimetallic strip (92), the bimetallic strip (92) comprises a fixed end and a movable end bent around the fixed end as a rotation center, the fixed end of the bimetallic strip (92) is fixedly connected with the second static contact (222), the bimetallic strip (92) is electrically connected with the corresponding second plug-in mechanism (412), the second arc extinguishing mechanism (62) is arranged between the fixed end of the bimetallic strip (92) and the drive coil (83), and the movable end of the bimetallic strip (92) extends to one side of the operating mechanism to trigger the operating mechanism to trip.

4. The circuit breaker of claim 2, wherein: The operating mechanism comprises a rotating member (273) arranged in rotation, a lock catch (25) and a trip catch (26) arranged on the contact support (24), the lock catch (25) and the trip catch (26) are snap-fitted, the trip catch (26) is connected with the rotating member (273) through a first connecting rod (272), the rotating member (273) is connected with the manual drive mechanism (3) through a second connecting rod (275), and the contact support (24) is connected with the energy storage spring (23).

5. The circuit breaker of claim 4, wherein: The first arc extinguishing mechanism (61), the first static contact (221) and the rotating member (273) are arranged side by side along the second direction.

6. The circuit breaker of claim 1, wherein: The circuit breaker further comprises a first arc leading plate (711) and a second arc leading plate (712), the first arc extinguishing mechanism (61) is located between the first arc leading plate (711) and the first static contact (221), the second arc extinguishing mechanism (62) is located between the second arc leading plate (712) and the second static contact (222), and the first arc leading plate (711) and the second arc leading plate (712) are connected through a second conductive member (713).

7. The circuit breaker of claim 1, wherein: The circuit breaker further comprises a current transformer (42) and a circuit board (43), the circuit board (43) is provided with a communication plug-in mechanism (45), the communication plug-in mechanism (45) is arranged between the two plug-in mechanisms (41), the circuit board (43) is provided with a power taking clamp (44) and a transformer terminal (420), the transformer terminal (420) is connected with the current transformer (42), one of the plug-in mechanisms (41) is provided with a first lead wire (46) penetrating through the middle of the current transformer (42), the other plug-in mechanism (41) is provided with a second lead wire (47), and the power taking clamp (44) is connected with the second lead wire (47).

8. The circuit breaker of claim 4, wherein: The circuit breaker further comprises a locking mechanism (5), the locking mechanism (5) comprising a locking piece (51), the shell (1) being provided with a locking hole, the locking piece (51) being provided with a locking protrusion (513), the locking spring driving the locking protrusion (513) of the locking piece (51) to extend out of the shell (1), the locking piece (51) being capable of retracting into the shell (1) under force, and the locking piece (51) being arranged on one side of the first arc extinguishing mechanism (61) along the second direction.

9. The circuit breaker of claim 8, wherein: The operating mechanism comprises a rotating piece (273) arranged between the first arc extinguishing mechanism (61) and the locking piece (51), the rotating piece (273) being provided with a stop portion (274), the stop portion (274) being arranged on the moving path of the locking piece (51) to block the locking piece (51) when the movable contact bridge (214) contacts the fixed contact, so that the locking protrusion (513) cannot retract into the shell (1).

10. The circuit breaker of claim 8, wherein: The first arc extinguishing mechanism (61) comprises a plurality of parallel arranged arc extinguishing fins, one end of the arc extinguishing fin in the first arc extinguishing mechanism (61) being inclined away from the locking mechanism (5) along the second direction, so that the arc extinguishing fin in the first arc extinguishing mechanism (61) is inclined to the first direction.

11. The circuit breaker of claim 1, wherein: The included angle between the two contact swing portions (216) is 100-170 degrees.

12. The circuit breaker of claim 8, wherein: The movable contact bridge (214) is rotatably arranged on the contact support (24), the contact swing portion (215) being provided with a contact swing hole (217) rotatably sleeved on the contact support (24), the contact support (24) being provided with two contact springs (243) connected with the two contact swing portions (216) respectively, and the two contact springs (243) driving the contact swing portion (216) of the movable contact bridge (214) to press the fixed contact.

13. The circuit breaker of claim 12, wherein: The contact support (24) is provided with a support rotating shaft (244), the contact swing hole (217) of the contact swing portion (215) being sleeved on the support rotating shaft (244), the contact swing hole (217) comprising two contact hole walls oppositely arranged on both sides of the support rotating shaft (244), the distance between the two contact hole walls being greater than the diameter of the support rotating shaft (244), so that the support rotating shaft (244) and the contact swing hole (217) can be rotatably and slidably matched.

14. The circuit breaker of claim 12, wherein: The contact support (24) comprises a disc-shaped support rotating part (246), the middle part of the support rotating part (246) is provided with a support rotating shaft (244), the support rotating part (246) is provided with two support oscillating grooves (247) corresponding to two contact oscillating parts (216), each support oscillating groove (247) is provided with a support spring groove (248) and a limiting boss (249) on both sides along the rotating direction of the contact support (24), the support spring groove (248) is used for accommodating the contact spring (243), one end of the contact spring (243) is limited in the support spring groove (248), the other end is connected with the corresponding contact oscillating part (216), the contact spring (243) drives the oscillating part (216) of the movable contact bridge (214) to be pressed against the limiting boss (249) before the movable contact bridge (214) contacts the static contact, and the oscillating part (216) of the movable contact bridge (214) is pressed against the corresponding static contact after the movable contact bridge (214) contacts the static contact.

15. The circuit breaker of claim 14, wherein: The support spring groove (248) is arc-shaped, and the contact spring (243) is arranged in the support spring groove (248) in a bent manner.

16. The circuit breaker of claim 14, wherein: The limiting boss (249) corresponding to one of the contact oscillating parts (216) constitutes the groove wall of the support spring groove (248) corresponding to the other contact oscillating part (216), and the other limiting boss (249) and the support spring groove (248) are provided with a support boss (240) therebetween, the support boss (240) is used for constituting the side wall of the support groove (245), the support rotating shaft (244) is arranged in the support groove (245), the support groove (245) is used for accommodating the contact rotating part (215), and the inner diameter R2 of the support groove (245) is greater than the outer diameter R1 of the contact rotating part (215).

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