Circuit breaker

Abstract

A circuit breaker comprises a shell, and a manual driving mechanism, an operating mechanism, a contact mechanism and a wiring structure which are arranged in the shell, the manual driving mechanism and the wiring structure are respectively arranged at two opposite ends of the shell along a first direction, and two plugging mechanisms of the wiring structure are arranged side by side at an interval along a second direction. The operating mechanism is arranged between the manual driving mechanism and the wiring structure, two arc extinguishing mechanisms which are arranged side by side along a third direction are arranged between the operating mechanism and the wiring structure, two moving contacts and two static contacts are arranged between the operating mechanism and the two arc extinguishing mechanisms, and the two static contacts correspond to the two moving contacts respectively. The two arc extinguishing mechanisms correspond to the two static contacts respectively, the first direction, the second direction and the third direction are perpendicular to each other, back-in and back-out can be achieved, and the circuit breaker has the advantages of being compact in structure and convenient to operate.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of low-voltage apparatus, concretely relates to a circuit breaker. BACKGROUND

[0002] The circuit breaker is commonly used for controlling the on-off of a line and automatically cutting off the line when the line is in failure, thereby protecting the line and load. With the diversification and complication of the application environment of the circuit breaker, the breaking capacity of the circuit breaker is increasingly required. However, the breaking capacity of the existing circuit breaker is difficult to improve due to the space and structure. In addition, the existing plug-in circuit breaker is of a forward and backward wiring mode. The rear end of the circuit breaker is provided with a busbar clamp, which can be directly inserted into a cabinet to be conducted. The front end of the circuit breaker is provided with a wiring terminal for fixing a wire. However, the wiring screw is difficult to operate when the space is narrow. When there are too many wires, the wires are prone to be connected incorrectly. In addition, when the circuit breaker is assembled and disassembled, the bare wires are prone to appear, which is prone to cause electric shock safety accidents. SUMMARY

[0003] The utility model aims at overcoming at least one defect of the prior art and providing a circuit breaker.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A circuit breaker comprises a shell, a manual driving mechanism, an operating mechanism, a contact mechanism, an arc extinguishing mechanism and a wiring structure arranged in the shell. The manual driving mechanism is connected with the operating mechanism. The operating mechanism is connected with a movable contact. The manual driving mechanism can drive the operating mechanism to drive the movable contact to rotate and contact or separate from a fixed contact,

[0006] The contact mechanism comprises two movable contacts electrically connected through a contact connecting part and two fixed contacts arranged side by side in the shell along a third direction. The two movable contacts are arranged side by side and spaced apart on a contact support of the operating mechanism along the third direction. The rotation axis of the contact support is parallel to the third direction. The wiring structure comprises two plug-in mechanisms electrically connected with the two fixed contacts,

[0007] The manual driving mechanism and the wiring structure are arranged at opposite ends of the shell along a first direction. The two plug-in mechanisms are arranged side by side and spaced apart along a second direction. The operating mechanism is arranged between the manual driving mechanism and the wiring structure. Two arc extinguishing mechanisms are arranged side by side along the third direction between the operating mechanism and the wiring structure. The two movable contacts and the two fixed contacts are arranged between the operating mechanism and the two arc extinguishing mechanisms. The two fixed contacts correspond to the two movable contacts respectively. The two arc extinguishing mechanisms correspond to the two fixed contacts respectively. The first direction, the second direction and the third direction are arranged perpendicular to each other. The manual driving mechanism drives the two movable contacts to contact and separate from the corresponding two fixed contacts through the operating mechanism.

[0008] Preferably, the circuit breaker comprises a short-circuit protection mechanism and an overload protection mechanism, the contact mechanism is located between the short-circuit protection mechanism and the overload protection mechanism in the second direction, and at least part of the short-circuit protection mechanism and at least part of the overload protection mechanism are oppositely arranged on both sides of the operating mechanism in the second direction to trigger the operating mechanism to trip, one of the static contacts is connected to one of the plug-in mechanisms through the short-circuit protection mechanism, and the other static contact is connected to the other plug-in mechanism through the overload protection mechanism.

[0009] Preferably, the overload protection mechanism is connected to one of the plug-in mechanisms through a first conductive member, the short-circuit protection mechanism is connected to the other plug-in mechanism through a second conductive member, the first conductive member and the second conductive member are oppositely arranged in the second direction, and the two arc extinguishing mechanisms are arranged between the first conductive member and the second conductive member.

[0010] Preferably, the two static contacts are a first static contact and a second static contact, the two plug-in mechanisms are a first plug-in mechanism and a second plug-in mechanism, the overload protection mechanism comprises a bimetallic positioning member mounted on the housing and a bimetallic strip connected to the bimetallic positioning member, the bimetallic strip is connected to the first plug-in mechanism through a first conductive member, and the bimetallic strip is connected to the first static contact through a third conductive member, and the third conductive member is located on one side of the operating mechanism in the third direction.

[0011] The short-circuit protection mechanism comprises an iron core and a drive coil for driving the iron core to move, 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, and two ends of the drive coil are connected to the second static contact and the second conductive member respectively, and the second conductive member is connected to the second plug-in mechanism.

[0012] Preferably, the short-circuit protection mechanism comprises a magnetic yoke and a coil skeleton arranged on the magnetic yoke, the inner side of the coil skeleton is provided with an iron core, and the outer side of the coil skeleton is provided with a drive coil for driving the iron core to move; the first static contact and the second static contact are arranged on the magnetic yoke of the short-circuit protection mechanism near one end of the moving contact, the second static contact is connected to the drive coil of the short-circuit protection mechanism near one end of the moving contact, and the first static contact is connected to the bimetallic strip of the overload protection mechanism through a third conductive member near one end of the moving contact.

[0013] Preferably, the circuit breaker further comprises two arc striking mechanisms, each of the arc striking mechanisms comprises an arc striking plate, the arc striking plates of the two arc striking mechanisms are arranged side by side and spaced apart in the third direction, and are oppositely arranged with the two static contacts in the second direction, and the two arc striking plates and the two static contacts are provided with the two arc extinguishing mechanisms therebetween.

[0014] Preferably, each of the arc striking mechanisms comprises the arc striking plate arranged opposite to the corresponding stationary contact, and two magnetic conductive plates and two gas generating plates arranged between the arc striking plate and the corresponding stationary contact, the two magnetic conductive plates of each arc striking mechanism are arranged opposite to the two sides of the corresponding stationary contact, and the two gas generating plates of each arc striking mechanism are arranged between the corresponding stationary contact and the magnetic conductive plates on the two sides, respectively, and the arc striking plates of the two arc striking mechanisms are electrically connected through the sixth electrically conductive member.

[0015] Preferably, the contact support comprises a support partition rotatably connected with the shell, the two movable contacts are arranged on the two opposite sides of the support partition, respectively, and the two movable contacts are rotatably arranged on the support partition, and the support partition is provided with two contact springs connected with the two movable contacts, respectively.

[0016] Preferably, the contact support comprises a support base connected with the support partition, the support base is provided with a lock catch and a jump catch, the lock catch and the jump catch are rotatably arranged on the support base and are snap-fitted, the energy storage spring is arranged between the support base and the shell, the jump catch is connected with the manual driving mechanism through the first connecting rod, the lock catch spring drives the lock catch and the jump catch to be snap-locked, so that the manual driving mechanism drives the contact support to rotate through the snap-locked lock catch and jump catch, and the contact support can compress the energy storage spring when the movable contact and the stationary contact are in contact.

[0017] Preferably, the lock catch comprises a lock catch rotating part coaxially arranged with the contact support, and a lock catch locking part, a lock catch short circuit part and a lock catch overload part connected with the lock catch rotating part, respectively, the lock catch overload part is arranged on one side of the lock catch rotating part close to the overload protection mechanism, the lock catch short circuit part is arranged on one side of the lock catch rotating part close to the short circuit protection mechanism, the jump catch is located between the lock catch and the lock catch overload part, the lock catch locking part is used for locking the jump catch, the lock catch overload part is provided with a pull rod matched with the overload protection mechanism and a stop part extending to the side of the movable contact away from the stationary contact, the overload protection mechanism drives the lock catch to rotate through the pull rod when the overload current meets a threshold value, so that the lock catch locking part is away from the jump catch and unlocks the jump catch, and the lock catch short circuit part is matched with the short circuit protection mechanism, the short circuit protection mechanism drives the lock catch to rotate when the short circuit current meets a threshold value, so that the lock catch locking part is away from the jump catch and unlocks the jump catch.

[0018] Preferably, the circuit breaker further comprises a current transformer and a circuit board, the circuit board is provided with a power taking clamp and a transformer terminal, the transformer terminal is connected with the current transformer, one of the two plug-in mechanisms is provided with a first lead wire passing through the middle of the current transformer, the other of the two plug-in mechanisms is provided with a second lead wire, and the power taking clamp is connected with the second lead wire.

[0019] Preferably, the circuit breaker further comprises a locking mechanism, the locking mechanism comprises a locking piece, the shell is provided with a locking hole, the locking piece is provided with a locking protrusion, a locking spring drives the locking protrusion of the locking piece to extend out of the shell from the locking hole, the locking piece can retract into the shell under force, and the locking mechanism is arranged on one side of the manual driving mechanism and the operating structure in the second direction.

[0020] Preferably, the manual driving mechanism comprises a handle arranged in rotation, the handle can rotate between a closing position, an opening position and an unlocking position, the opening position is between the closing position and the unlocking position, when the handle rotates to the closing position, the operating structure drives the moving contact to contact the stationary contact, when the handle rotates to the opening position, the operating structure drives the moving contact to separate from the stationary contact, and when the handle rotates to the unlocking position, the locking piece can be driven to retract the locking protrusion into the shell.

[0021] The circuit breaker of the utility model, through two moving contacts arranged side by side along the width direction of the circuit breaker and two stationary contacts arranged side by side along the width direction of the circuit breaker, the on-off of the main circuit controlled by double-break points is formed, two break points are formed when arcing, arc extinguishing is accelerated, two plug-in mechanisms are respectively the incoming line end and outgoing line end of one-pole circuit and are electrically connected with two stationary contacts, wiring is not needed at both ends of the shell, after alignment of the plug-in end, the plug-in mechanism of the plug-in end is pushed to be sleeved on the plug-in piece, connection can be realized, and the plug-in mechanism can be realized to be plugged in and pulled out from behind.

[0022] In addition, the circuit breaker is further provided with a short-circuit protection mechanism and an overload protection mechanism, one stationary contact is connected with one plug-in mechanism through the short-circuit protection mechanism, the other stationary contact is connected with the other plug-in mechanism through the overload protection mechanism, and the contact mechanism is located between the short-circuit protection mechanism and the overload protection mechanism, so that the circuit breaker is complete in function and reasonable in layout.

[0023] In addition, the locking piece is provided with a stop portion, the stop portion blocks the locking piece in the movement path of the locking piece when the circuit breaker is closed, so that the locking protrusion cannot retract into the shell, and the circuit breaker in the closed state cannot be inserted into or pulled out of the cabinet, so that the safety of electricity use is improved, and electric shock is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structure schematic view of the circuit breaker of the utility model;

[0025] Figure 2 It is another structure schematic view of the circuit breaker of the utility model;

[0026] Figure 3This is a schematic diagram of the main circuit of the circuit breaker of this utility model;

[0027] Figure 4 This is a schematic diagram of the contact support and moving contact of this utility model;

[0028] Figure 5 This is another structural schematic diagram of the contact support and moving contact of this utility model;

[0029] Figure 6 This is a schematic diagram of the arc-extinguishing mechanism of this utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the handle-driven locking mechanism of this utility model for unlocking;

[0031] Figure 8 This is a schematic diagram of the structure of the unlocking component of this utility model that drives the locking mechanism to unlock;

[0032] Figure 9 This is a structural schematic diagram of the locking component of this utility model;

[0033] Figure 10 This is another structural schematic diagram of the locking component of this utility model;

[0034] Figure 11 This is a structural schematic diagram of the transmission component of this utility model;

[0035] Figure 12 This is a structural schematic diagram of the unlocking component of this utility model;

[0036] In the picture:

[0037] 1. Housing 92 bimetallic strip

[0038] 2. Contact mechanism 93. Third conductive element

[0039] 3. Manual drive mechanism 94 adjusting screw

[0040] 4. Wiring structure 213. Moving contact part

[0041] 5 Locking mechanism 221 First stationary contact

[0042] 6 Arc extinguishing mechanism 222 Second stationary contact

[0043] 7 Arc-starting mechanism 241 Support partition

[0044] 8 Short circuit protection mechanism 242 Support base

[0045] 9. Overload protection mechanism 243. Contact spring

[0046] 11 Insertion end 251 Locking spring

[0047] 12 Operating end 252 Locking rotating part

[0048] 21 Moving contact 253 Locking part

[0049] 22 stationary contact 254 locking short circuit section

[0050] 23 Energy Storage Spring 255 Locking Overload Section

[0051] 24 contacts support 256 stops

[0052] 25 Lock 271 First Link

[0053] 26 Jump Buckle 311 Handle Rotating Part

[0054] 41 Plug-in mechanism 312 Handle operating unit

[0055] 42 Current transformer 313 Handle push part

[0056] 43 Circuit Board 411 First Plug-in Mechanism

[0057] 44 Power clip 412 Second plug-in mechanism

[0058] 45 Communication plug-in mechanism 413 First conductive element

[0059] 46 First conductor 414 Second conductive element

[0060] 47 Second conductor 420 Current transformer terminal

[0061] 48 Exhaust passage 511 Locking sliding part

[0062] 51 Locking component 512 Locking driven part

[0063] 52 Unlocking part 513 Locking protrusion

[0064] 53 Transmission component 514 Locking spring groove

[0065] 61 First arc extinguishing mechanism 515 Locking limit part

[0066] 62 Second arc extinguishing mechanism 521 Unlock rotating part

[0067] 71 Arc-starting plate 522 Unlocking push unit

[0068] 72 Magnetic Plate 523 Unlocking Operation Section

[0069] 73 Gas-generating plate 524 Unlocking spring groove

[0070] 81 magnetic yoke 531 transmission rotating part

[0071] 82 iron core 532 transmission drive unit

[0072] 83 drive coil 533 transmission unlocking part

[0073] 84 push plate 534 first unlocking section

[0074] 91 Double Gold Positioning Part 535 Second Unlocking Part Detailed Implementation

[0075] 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.

[0076] like Figures 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 2, an arc-extinguishing mechanism 6, a protection mechanism, and a wiring structure 4, all respectively disposed within the housing 1. The contact mechanism 2 includes a moving contact 21 and a stationary contact 22. The wiring structure 4 is connected to the contact mechanism 2 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 21. 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 make contact with or separate from the stationary contact 22, thereby realizing the closing and opening of the circuit breaker. The arc-extinguishing mechanism 6 is disposed near the contact mechanism 2 and is used to extinguish the arc generated by the moving contact 21 and the stationary contact 22. 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 21 to separate from the stationary contact 22, 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 realize 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 21 to contact the stationary contact 22 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 to push the latch 25, releasing the latch 25 and trip latch 26, causing the operating mechanism to disengage and separating the moving contact 21 from the stationary contact 22, 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.

[0077] like Figure 1As 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 two moving contacts 21 and two stationary contacts 22 to control the opening and closing of the main circuit, thereby improving the circuit breaker's breaking capacity.

[0078] 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.

[0079] like Figures 1-2 As shown, the contact mechanism 2 in this embodiment includes two moving contacts 21 arranged side-by-side at intervals along a third direction, and two stationary contacts 22 arranged side-by-side within the housing 1 along a third direction. The two moving contacts 21 are arranged on the contact support 24 of the operating mechanism along a third direction, and are electrically connected to each other through a contact connection part 212. The rotation axis of the contact support 24 is parallel to the third direction. The wiring structure 4 includes two plug-in mechanisms 41, which can be simultaneously fitted onto their respective corresponding plug-in parts to achieve connection with the power supply and the load. The two plug-in mechanisms 41 are electrically connected to the two stationary contacts 22 respectively. The two moving contacts 21 and the two stationary contacts 22 form a double-break point control for the on / off of the main circuit. The manual drive mechanism 3 and the wiring structure 4 are respectively arranged at opposite ends of the housing 1 along a first direction. The two ends of the housing 1 are respectively for inserting... The device has an insertion end 11 and an operating end 12. Two insertion mechanisms 41 are arranged side by side and spaced apart along the second direction. A manual drive mechanism 3 is arranged at the operating end 12. The operating mechanism is located between the manual drive mechanism 3 and the wiring structure 4. Two arc-extinguishing mechanisms 6 are arranged side by side along the third direction between the operating mechanism and the wiring structure 4. The contact structure 2 is located between the operating mechanism and the two arc-extinguishing mechanisms 6. That is, the two moving contacts 21 and two stationary contacts 22 are located between the operating mechanism and the two arc-extinguishing mechanisms 6. The two stationary contacts 22 correspond to the two moving contacts 21 respectively. The two arc-extinguishing mechanisms 6 correspond to the two stationary contacts 22 respectively. The first direction, the second direction and the third direction are arranged perpendicular to each other. The manual drive mechanism 3 drives the two moving contacts 21 to contact and separate from the corresponding two stationary contacts 22 through the operating mechanism.

[0080] The circuit breaker in this embodiment uses two moving contacts 21 arranged side-by-side along the width of the circuit breaker and two stationary contacts 22 arranged side-by-side along the width of the circuit breaker to form a double-break control for the main circuit. This not only creates two breaks during arc initiation, accelerating arc extinguishing, but also allows the two plug-in mechanisms 41 to serve as the input and output terminals of a single-pole circuit, respectively, electrically connected to the two stationary contacts. This eliminates the need for separate wiring at both ends of the housing 1. After aligning the insertion end, pushing the operating end allows the plug-in mechanism to fit onto the plug-in component, achieving connection. This allows for a rear-in, rear-out connection. In this embodiment, the plug-in component is a busbar, and the plug-in mechanism 41 is a busbar clamp. The busbar clamp includes two opposing clamping pieces, which clamp the busbar from both sides, allowing the contact mechanism 2 to connect to the power supply and load via the two busbar clamps. The busbar, as a plug-in component, is typically installed in a cabinet, and the circuit breaker is inserted into the cabinet with its plug-in mechanism 41 clamping the busbar. The use of a plug-in mechanism 41 to connect with the busbar plug-in mechanism 41 offers advantages such as ease of operation and avoids issues like excessive wires and exposed wires, thus reducing the risk of electric shock. Alternatively, in other embodiments, the plug-in mechanism 41 can be a plug-in plate extending outside the housing 1, and the connector inside the cabinet can be a busbar clamp; the key is to ensure that the plug-in mechanism 41 and the connector inside the cabinet are connected in a compatible manner.

[0081] like Figures 1-3 As shown, the protection mechanism includes a short-circuit protection mechanism 8 and an overload protection mechanism 9. One stationary contact 22 is connected to one of the plug-in mechanisms 41 via the short-circuit protection mechanism 8, and the other stationary contact 22 is connected to another plug-in mechanism 41 via the overload protection mechanism 9. In the second direction, the contact mechanism 2 is located between the short-circuit protection mechanism 8 and the overload protection mechanism 9. The short-circuit protection mechanism 8, the two stationary contacts 22, the two moving contacts 21, and the overload protection mechanism 9 are arranged sequentially along the second direction. 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 the second direction to trigger the operating mechanism to trip, providing complete functionality and a reasonable layout.

[0082] Furthermore, such as Figure 3 As shown, the overload protection mechanism 9 is connected to one of the plug-in mechanisms 41 via the first conductive element 413, and the short-circuit protection mechanism 8 is connected to the other plug-in mechanism 41 via the second conductive element 414. The first conductive element 413 and the second conductive element 414 are arranged opposite to each other along the second direction. The two arc-extinguishing mechanisms 6 are arranged between the first conductive element 413 and the second conductive element 414. The two arc-extinguishing mechanisms 6 are arranged side by side along the third direction and are respectively arranged corresponding to the first stationary contact 221 and the second stationary contact 222, which can improve the space utilization and efficiently extinguish the arcs of the two sets of breakpoints.

[0083] Specifically, the two stationary contacts 22 are respectively the first stationary contact 221 and the second stationary contact 222, and the two plug-in mechanisms 41 are respectively the first plug-in mechanism 411 and the second plug-in mechanism 412. The first stationary contact 221 is connected to the first plug-in mechanism 411 through the overload protection mechanism 9, and the second stationary contact 222 is connected to the second plug-in mechanism 412 through the short-circuit protection mechanism 8.

[0084] The overload protection mechanism 9 includes a bimetallic positioning member 91 mounted on the housing 1 and a bimetallic strip 92 connected to the bimetallic positioning member 91. The bimetallic strip 92 is connected to the first insertion mechanism 411 through a first conductive member 413. The middle part of the bimetallic strip 92 is connected to the first stationary contact 221 through a third conductive member 93. The third conductive member 93 is a flexible connection and is located on the third-direction side of the operating mechanism. When the overload current of the external line meets the threshold, the bimetallic strip 92 bends. The end of the bimetallic strip 92 away from the bimetallic positioning member 91 extends to one side of the operating mechanism to trigger the operating mechanism to trip. The bimetallic strip 92 triggers the operating mechanism to trip by driving the latch 25 and the jumper 26 to unlock.

[0085] The short-circuit protection mechanism 8 includes an iron core 82 and a drive coil 83 for driving the iron core 82 to move. 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 two ends of the drive coil 83 are respectively connected to the second stationary contact 222 and the second conductive element 414. The second conductive element 414 is connected to the second plug-in mechanism 412. When the two moving contacts 21 conduct the first stationary contact 221 and the second stationary contact 222, the current passes through the first plug-in mechanism 412, the first conductive element 413, the overload protection mechanism 9, the first stationary contact 221, the first moving contact 211, the contact connection part 212, the second moving contact 212, the second stationary contact 222, the short-circuit protection mechanism 8, the second conductive element 414 and the second plug-in mechanism 412.

[0086] The short-circuit protection mechanism 8 includes a magnetic yoke 81 and a coil frame disposed on the magnetic yoke 81. An iron core 82 is disposed on the inner side of the coil frame, and a drive coil 83 for driving the iron core 82 to move is disposed on the outer side of the coil frame. When the short-circuit current meets the threshold, the drive coil 83 drives the iron core 82 to move the push plate 84, and triggers the contact mechanism 2 to unlock through the push plate 84. The first stationary contact 221 and the second stationary contact 222 are disposed on the magnetic yoke 81 of the short-circuit protection mechanism 8 at one end near the moving contact 21. The second stationary contact 222 is connected to the drive coil 83 of the short-circuit protection mechanism 8 at one end near the moving contact 21. The first stationary contact 221 is connected to the bimetallic strip 92 of the overload protection mechanism 9 through a third conductive element 93.

[0087] like Figures 1-3As shown, the circuit breaker further includes two arc-starting mechanisms 7, each of which includes an arc-starting plate 71. The arc-starting plates 71 of the two arc-starting mechanisms 7 are arranged side by side at intervals along a third direction and are respectively arranged opposite to two stationary contacts 22 in a second direction. Two arc-extinguishing mechanisms 6 are provided between the two arc-starting plates 71 and the two stationary contacts 22. Preferably, the overload protection mechanism 9 further includes an adjusting screw 94 provided on the housing 1. The adjusting screw 94 can move along the second direction and push the bimetallic strip 92, so that the bimetallic strip 92 changes its initial position, thereby adjusting the threshold of the overload current that triggers the contact mechanism 2 to unlock.

[0088] like Figures 4-5 As shown, the contact support 24 includes a support partition 241 rotatably connected to the housing 1. Two moving contacts 21 are located on opposite sides of the support partition 241 and are rotatably mounted on the support partition 241. The support partition 241 is provided with two contact springs 243, each connected to one of the moving contacts 21. The two contact springs 243 mount the two moving contacts 21 on the contact support 24 and are used to drive the corresponding moving contact 21 to press against the stationary contact 22 and to achieve overtravel. A contact connecting part 212 connects the two moving contacts 21. The contact connecting part 212 can be a rigid connection or a flexible connection, or it can be integrally formed with the two moving contacts 21. Preferably, the contact connection part 212 is a flexible connection. Compared with the rigid connection that fixes the two moving contacts 21 into a whole for rotation, the flexible contact connection part 212 allows the two moving contacts 21 to have different rotation angles relatively independently, and each can make close and reliable contact with the corresponding stationary contact 22. This avoids the situation where the two moving contacts 21 and the stationary contacts 22 cannot make close and reliable contact due to different installation positions or different wear levels.

[0089] Furthermore, a latch 25 and a snap fastener 26 are rotatably mounted on the contact support 24. An energy storage spring 23 is connected to the contact support 24. The contact support 24 includes a support base 242 connected radially to one side of the support partition 241. The latch 25 and snap fastener 26 are rotatably mounted on the support base 242 and engage with each other. The energy storage spring 23 is located between the support base 242 and the housing 1. The snap fastener 26 is connected to the manual drive mechanism 3 via a first connecting rod 271. The latch spring 251 drives the latch 25 and snap fastener 26 to engage and interlock, locking the snap fastener 26 in a position where it cannot be positioned relative to the contact support. With the contact support 24 in a rotating state, the first link 271, latch 25, jumper 26, and contact support 24 form a four-bar linkage structure. This allows the manual drive mechanism 3 to drive the contact support 24 to rotate through the interlocked latch 25 and jumper 26. When the moving contact 21 contacts the stationary contact 22, the contact support 24 can compress the energy storage spring 23. When a fault occurs, the protection mechanism triggers the latch 25 and jumper 26 to release the latch and release the energy storage spring 23. The energy storage spring 23 then drives the contact support 24 to rotate, causing the contact support 24 to separate the moving contact 21 from the stationary contact 22, thus achieving the protection function.

[0090] like Figures 4-5 As shown, 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 overload part 255 is located on the side of the latch rotating part 252 near the overload protection mechanism 9, and the latch short-circuit part 254 is located on the side of the latch rotating part 252 near the short-circuit protection mechanism 8. The jump latch 26 is located between the locking jump latch 26 and the latch overload part 255. The latch locking part 253 is used for... The locking latch 26 has an overload locking part 255 with a pull rod that cooperates with the overload protection mechanism 9, and a stop part 256 that extends to the side of the moving contact 21 away from the stationary contact 22. When the overload protection mechanism 9 meets the threshold, it drives the latch 25 to rotate through the pull rod, so that the locking part 253 moves away from the latch 26 and unlocks the latch 26. The locking short circuit part 254 cooperates with the short circuit protection mechanism 8. When the short circuit protection mechanism 8 meets the threshold, it drives the latch 25 to rotate, so that the locking part 253 moves away from the latch 26 and unlocks the latch 26.

[0091] like Figure 6As shown, each of the arc-initiating mechanisms 7 includes an arc-initiating plate 71 disposed opposite to the corresponding stationary contact 22, and two magnetic plates 72 and two gas-generating plates 73 disposed between the arc-initiating plate 71 and the corresponding stationary contact 22. The arc-initiating plates 71 of the two arc-initiating mechanisms 7 are electrically connected through a sixth conductive element. The two magnetic plates 72 of each arc-initiating mechanism 7 are disposed opposite to each other on both sides of the corresponding stationary contact 22, and the two gas-generating plates 73 of each arc-initiating mechanism 7 are respectively disposed between the corresponding stationary contact 22 and the magnetic plates 72 on both sides. The magnetic plates 72 can generate a magnetic field, driving the arc to move towards the arc-extinguishing mechanism 6. Thus, in the third direction, each stationary contact 22 has a magnetic plate 72 and a gas-generating plate 73 on both sides. The front ends of the two arc-initiating plates 71 form an integral electrical connection, while the rear ends are two separate upper and lower arc-initiating parts, which are respectively placed on the upper and lower sides of the arc-extinguishing mechanism 6. When the contacts break, the current circuit does not flow through the moving contact, but forms a circuit through the first stationary contact 221, one of the arc-initiating plates 71, the other arc-initiating plate 71, the second stationary contact 222, and the driving coil 83. This circuit forms two break points between the first stationary contact 221 and the corresponding arc-initiating plate 71, and between the second stationary contact 222 and the corresponding arc-initiating plate 71, which can accelerate the extinction of the arc.

[0092] like Figures 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. 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 its third-direction side. A communication plug-in mechanism 45 connected to the circuit board 43 is provided 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 the host computer through external communication equipment.

[0093] like Figures 7-12 As shown, the housing 1 is provided with a locking mechanism 5, which includes a locking member 51. The housing 1 has a locking hole, and the locking member 51 has a locking protrusion 513. A 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. When the locking member 51 is subjected to force, it can overcome the elastic force of the locking spring, causing the locking protrusion 513 to retract into the housing 1 and release the lock from the cabinet. The cabinet has 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, and the locking protrusion 513 of the locking member 51 extends into the cabinet locking hole to lock the circuit breaker inside the cabinet.

[0094] 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, allowing manual operation to drive the transmission member 53 to press down the locking member 51. Obviously, in other embodiments, the locking member 51 can also be rotatably disposed, or the locking member 51 and the transmission member 53 can be integrally disposed, etc.

[0095] Preferably, the latch 25 is provided with a stop 256. When the circuit breaker is closed, that is, when the moving contact 21 contacts the stationary contact 22, the stop 256 rotates into the moving path of the locking member 51 to block the locking member 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 256 of the latch 25 rotates to a position that avoids the locking member 51. At this time, the locking member 51 is subjected to force that allows the locking protrusion 513 to retract into the housing 1.

[0096] Specifically, in this embodiment, the locking member 51 is linearly movable. The locking member 51 includes a locking sliding part 511 and a locking driven part 512 protruding along a third direction on the side of the locking sliding part 511. The locking sliding part 511 has a locking protrusion 513 and a locking spring groove 514 on its two opposite sides along the first direction, respectively. The bottom of the locking sliding part 511 of the locking member 51 has a locking limiting part 515. The overload part 255 of the latch 25 has a stop part 256. The stop part 256 blocks the locking limiting part 515 when the moving contact 21 contacts the stationary contact 22, so that the locking protrusion 513 extends out of the housing 1 and remains locked. The two ends of the locking spring are respectively limited by the locking spring groove 514 and the housing 1. The locking driven part 512 cooperates with the transmission member 53. The transmission member 53 can push the lock under the drive of the locking member 51 or the manual drive mechanism 3. The driven part 512 causes the locking sliding part 511 to overcome the force of the locking spring and drive the locking protrusion 513 back into the housing 1. After the force of the transmission member 53 disappears, the locking spring drives the locking sliding part 511 to move, causing the locking protrusion 513 to reset and extend out of the housing 1. The transmission member 53 is rotatably disposed between the unlocking member 52 and the locking member 51. 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 around 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 of the locking member 51 to drive the locking member 51 back into the housing 1. The transmission unlocking part 533 cooperates with the unlocking member 52 and / or the manual drive mechanism 3.

[0097] The transmission unlocking part 533 of the transmission member 53 includes a first unlocking part 534 disposed along the side of the unlocking member 52 in a first direction, and a second unlocking part 535 disposed near the side of the unlocking member 52 near the first unlocking part 534. The first unlocking part 534 cooperates with the manual drive mechanism 3, and the second unlocking part 535 cooperates with the unlocking member 52. When the unlocking member 52 rotates counterclockwise, it can push the second unlocking part 535 to drive the transmission member 53 to rotate clockwise, which is driven by the transmission pushing part 532 of the transmission member 53. The locking actuator 512 causes the locking member 51 to move along the second direction and drive the locking protrusion 513 to retract into the housing 1. The unlocking member 52 includes an unlocking rotating part 521 and an unlocking pushing part 522 and an unlocking operating part 523 respectively connected to the unlocking rotating part 521. The unlocking operating part 523 can drive the unlocking operating part 523 to rotate around the unlocking rotating part 521. The unlocking pushing part 522 drives the transmission member 53 to rotate, so that the transmission pushing part 532 of the transmission member 53 pushes the locking member 51 to retract into the housing 1.

[0098] Furthermore, the unlocking member 52 is connected to the unlocking spring, which is a torsion spring. The side of the unlocking member 52 is provided with an unlocking spring groove 524. The two ends of the unlocking spring are respectively limited to the housing 1 and the unlocking spring groove 524. The unlocking spring is used to drive the unlocking member 52 to maintain a clockwise rotation trend and to limit the unlocking member 52 to the housing 1, so that the unlocking member 52 is flush with the operating end 12 of the housing 1 and retracts into the housing 1. The unlocking member 52 will only start to rotate when the operating part 523 is unlocked by external force.

[0099] like Figure 6 As shown, the manual drive mechanism 3 includes a rotatable handle. The handle is connected to the trip latch 26 via a first connecting rod 271. The handle can rotate between the closed and open positions. When the handle is rotated to the closed position, the drive operation structure causes the moving contact 21 to contact the stationary contact 22. When the handle is rotated to the open position, the drive operation structure causes the moving contact 21 to separate from the stationary contact 22. Furthermore, the handle in this embodiment can also be used to unlock the locking member 51, thus eliminating the need for the transmission member 53 and the unlocking member 52. For example, the handle can rotate between the closed, open, and unlocked positions. 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 member 51 to retract the locking protrusion 513 into the housing 1. In this embodiment, the handle indirectly drives the locking member 51 via the transmission member 53.

[0100] Specifically, the handle 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 member 53 to rotate clockwise. The transmission pushing part 532 pushes the locking driven part 512, causing the locking member 51 to move along the second direction and drive the locking protrusion 513 to retract into the housing 1.

[0101] This embodiment can unlock the locking member 51 not only through the unlocking member 52, but also through the handle, making operation very convenient. Of course, the unlocking member 52 can also be omitted, and the unlocking member 52 can be formed by the manual drive mechanism 3, that is, only the first unlocking part 534 is provided but the second unlocking part 535 is not provided, all of which are within the protection scope of this utility model.

[0102] 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.

[0103] 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 (2), an arc extinguishing mechanism (6), and a wiring structure (4) disposed in the housing (1), wherein the manual drive mechanism (3) is connected to the operating mechanism, the operating mechanism is connected to a moving contact (21), and the manual drive mechanism (3) is capable of driving the operating mechanism to rotate the moving contact (21) to contact or separate from the stationary contact (22), characterized in that: The contact mechanism (2) includes two moving contacts (21) electrically connected by a contact connection part (212), and two stationary contacts (22) arranged side by side in the housing (1) along a third direction. The two moving contacts (21) are arranged side by side at intervals along a third direction on the contact support (24) of the operating mechanism. The rotation axis of the contact support (24) is parallel to the third direction. The wiring structure (4) includes two plug-in mechanisms (41), which are electrically connected to the two stationary contacts (22) respectively. The manual drive mechanism (3) and the wiring structure (4) are respectively arranged at opposite ends of the housing (1) along the first direction. The two plug-in mechanisms (41) are arranged side by side and spaced apart along the second direction. The operating mechanism is arranged between the manual drive mechanism (3) and the wiring structure (4). Two arc-extinguishing mechanisms (6) are arranged side by side along the third direction between the operating mechanism and the wiring structure (4). The two moving contacts (21) and two stationary contacts (22) are arranged between the operating mechanism and the two arc-extinguishing mechanisms (6). The two stationary contacts (22) correspond to the two moving contacts (21) respectively. The two arc-extinguishing mechanisms (6) correspond to the two stationary contacts (22) respectively. The first direction, the second direction and the third direction are arranged perpendicular to each other. The manual drive mechanism (3) drives the two moving contacts (21) to contact and separate from the corresponding two stationary contacts (22) through the operating mechanism.

2. The circuit breaker according to claim 1, characterized in that: The circuit breaker includes a short-circuit protection mechanism (8) and an overload protection mechanism (9). In a second direction, a contact mechanism (2) is located between the short-circuit protection mechanism (8) and the 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 to each other on both sides of the operating mechanism in the second direction to trigger the operating mechanism to trip. One stationary contact (22) is connected to one of the plug-in mechanisms (41) through the short-circuit protection mechanism (8), and the other stationary contact (22) is connected to the other plug-in mechanism (41) through the overload protection mechanism (9).

3. The circuit breaker according to claim 2, characterized in that: The overload protection mechanism (9) is connected to one of the plug-in mechanisms (41) through the first conductive element (413), and the short circuit protection mechanism (8) is connected to the other plug-in mechanism (41) through the second conductive element (414). The first conductive element (413) and the second conductive element (414) are arranged opposite to each other along the second direction, and the two arc extinguishing mechanisms (6) are arranged between the first conductive element (413) and the second conductive element (414).

4. The circuit breaker according to claim 3, characterized in that: The two stationary contacts (22) are respectively the first stationary contact (221) and the second stationary contact (222), the two plug-in mechanisms (41) are respectively the first plug-in mechanism (411) and the second plug-in mechanism (412), the overload protection mechanism (9) includes a bimetallic positioning member (91) installed on the housing (1), and a bimetallic strip (92) connected to the bimetallic positioning member (91). The bimetallic strip (92) is connected to the first plug-in mechanism (411) through a first conductive member (413), and the bimetallic strip (92) is connected to the first stationary contact (221) through a third conductive member (93). The third conductive member (93) is located on the third-direction side of the operating mechanism. The short-circuit protection mechanism (8) includes an iron core (82) and a drive coil (83) for driving the iron core (82) to move. 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 two ends of the drive coil (83) are respectively connected to the second stationary contact (222) and the second conductive element (414). The second conductive element (414) is connected to the second plug-in mechanism (412).

5. The circuit breaker according to claim 4, characterized in that: The short-circuit protection mechanism (8) includes a magnetic yoke (81) and a coil frame disposed on the magnetic yoke (81). An iron core (82) is provided on the inner side of the coil frame, and a drive coil (83) for driving the iron core (82) to move is provided on the outer side of the coil frame. The first stationary contact (221) and the second stationary contact (222) are disposed on the magnetic yoke (81) of the short-circuit protection mechanism (8) at one end near the moving contact (21). The second stationary contact (222) is connected to the drive coil (83) of the short-circuit protection mechanism (8) at one end near the moving contact (21). The first stationary contact (221) is connected to the bimetallic strip (92) of the overload protection mechanism (9) through a third conductive element (93).

6. The circuit breaker according to claim 1, characterized in that: The circuit breaker also includes two arc-starting mechanisms (7), each of which includes an arc-starting plate (71). The arc-starting plates (71) of the two arc-starting mechanisms (7) are arranged side by side at intervals along a third direction and are respectively arranged opposite to two stationary contacts (22) in a second direction. Two arc-extinguishing mechanisms (6) are provided between the two arc-starting plates (71) and the two stationary contacts (22).

7. The circuit breaker according to claim 6, characterized in that: Each of the arc-initiating mechanisms (7) includes an arc-initiating plate (71) disposed opposite to the corresponding stationary contact (22), and two magnetic plates (72) and two gas-generating plates (73) disposed between the arc-initiating plate (71) and the corresponding stationary contact (22). The two magnetic plates (72) of each arc-initiating mechanism (7) are disposed opposite to each other on both sides of the corresponding stationary contact (22), and the two gas-generating plates (73) of each arc-initiating mechanism (7) are respectively disposed between the corresponding stationary contact (22) and the magnetic plates (72) on both sides. The arc-initiating plates (71) of the two arc-initiating mechanisms (7) are electrically connected through a sixth conductive element.

8. The circuit breaker according to claim 1, characterized in that: The contact support (24) includes a support partition (241) rotatably connected to the housing (1). The two moving contacts (21) are located on opposite sides of the support partition (241). The two moving contacts (21) are rotatably mounted on the support partition (241). The support partition (241) is provided with two contact springs (243) that are respectively connected to the two moving contacts (21).

9. The circuit breaker according to claim 8, characterized in that: The contact support (24) includes a support base (242) connected to a support partition (241). The support base (242) is provided with a latch (25) and a snap fastener (26). The latch (25) and the snap fastener (26) are respectively rotatably mounted on the support base (242) and latched together. The energy storage spring (23) is located between the support base (242) and the housing (1). The snap fastener (26) is connected to the manual drive mechanism (3) through a first connecting rod (271). The latch spring (251) drives the latch (25) and the snap fastener (26) to latch and interlock, so that the manual drive mechanism (3) drives the contact support (24) to rotate through the interlocked latch (25) and snap fastener (26). The contact support (24) can compress the energy storage spring (23) when the moving contact (21) contacts the stationary contact (22).

10. The circuit breaker according to claim 9, characterized in that: 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 overload part (255) is located on the side of the latch rotating part (252) near the overload protection mechanism (9), and the latch short-circuit part (254) is located on the side of the latch rotating part (252) near the short-circuit protection mechanism (8). The trip latch (26) is located between the trip latch (26) and the latch overload part (255). The latch locking part (253) is used to lock the trip latch. The latch (26) and the latch overload part (255) are provided with a pull rod that cooperates with the overload protection mechanism (9) and a stop part (256) that extends to the side of the moving contact (21) away from the stationary contact (22). When the overload protection mechanism (9) meets the threshold, it 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 protection mechanism (8) meets the threshold, it 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).

11. The circuit breaker according to claim 1, characterized in that: The circuit breaker also includes a current transformer (42) and a circuit board (43). A communication plug-in mechanism (45) is connected to the circuit board (43). The communication plug-in mechanism (45) is located between 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). 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).

12. The circuit breaker according to claim 9, characterized in that: The circuit breaker also includes 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). A 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). The locking member (51) can be retracted into the housing (1) under force. The locking mechanism (5) is provided on one side of the manual drive mechanism (3) and the operating structure in the second direction. The latch (25) is provided with a stop (256). When the moving contact (21) contacts the stationary contact (22), the stop (256) rotates to the moving path of the locking member (51) to block the locking member (51) so that the locking protrusion (513) cannot be retracted into the housing (1).

13. The circuit breaker according to claim 12, characterized in that: The manual drive mechanism (3) includes a rotatable handle that can rotate between a closed position, an open position, and an unlocked position. The open position is located between the closed position and the unlocked position. When the handle is rotated to the closed position, the drive operation structure causes the moving contact (21) to contact the stationary contact (22). When the handle is rotated to the open position, the drive operation structure causes the moving contact (21) to separate from the stationary contact (22). When the handle is rotated to the unlocked position, it can drive the locking member (51) to retract the locking protrusion (513) into the housing (1).

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