Circuit breaker

Abstract

The utility model discloses a circuit breaker, which comprises a base and three contact system cavities separated by partition plates side by side, and an energy storage mechanism, three contact mechanisms and a switching-on and switching-off mechanism used for controlling the contact mechanisms to be connected or disconnected are arranged in each contact system cavity. The switching-on and switching-off mechanism comprises a switching-on assembly and a switching-off assembly, and the energy storage mechanism comprises an energy storage shaft and an energy storage spring. The energy storage shaft is provided with a first stop block matched with the closing assembly, an eccentrically arranged driving disc matched with the contact mechanism, an opening head matched with the opening assembly and the contact mechanism, a gear transmission assembly in transmission connection with the contact mechanism, and a first crank arm connected with the energy storage spring; the other end of the energy storage spring is connected with the partition plate, and the closing assembly, the opening assembly, the three contact mechanisms and the energy storage mechanism are in linkage. The defect that a manual plate brake of an existing circuit breaker needs large external force to operate is overcome.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage switchgear, and in particular to a circuit breaker. Background Technology

[0002] In power systems, circuit breakers are key devices for controlling and protecting circuits, and their performance directly affects the safe and stable operation of the power system. Currently, most circuit breakers widely used in the market adopt a manual control method. These manual control circuit breakers primarily control the opening and closing of the circuit by manually operating a lever. When closing the circuit, the operator must forcefully pull the lever to force the contacts to overcome resistance such as spring force and close the circuit; similarly, when a circuit fault occurs and needs to be disconnected, the operator must also apply considerable force to pull the lever to separate the contacts and thus cut off the circuit.

[0003] However, existing manual circuit breakers have significant drawbacks. Firstly, they require considerable force to operate, making them extremely difficult for operators with less strength, such as women or those with lower physical abilities. This can lead to delays in circuit control and protection due to inability to operate promptly and accurately, potentially causing safety accidents. Secondly, frequent and prolonged use of manual circuit breakers can easily cause operator fatigue, affecting operational accuracy and efficiency. Furthermore, in certain environments, such as confined spaces or situations requiring rapid operation, the inconvenience and limitations of manual operation become even more apparent.

[0004] To overcome the shortcomings of existing circuit breakers (such as 400A~800A circuit breakers) that require significant external force to operate manually, this invention aims to provide a circuit breaker that, by improving the operating mechanism, allows operators to easily control the circuit's on / off state without applying excessive force, thereby improving the circuit breaker's ease of operation and safety to meet the needs of different scenarios. Utility Model Content

[0005] To address the shortcomings of the existing technology, this utility model provides a circuit breaker that allows operators to easily control the on / off state of the circuit without applying excessive force, thereby improving the ease of operation of the circuit breaker.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a circuit breaker, comprising a base and a partition plate arranged side by side to form three contact system cavities, characterized in that an energy storage mechanism, three contact mechanisms, and a closing / opening mechanism for controlling the connection or disconnection of the contact mechanisms are provided in each contact system cavity; the closing / opening mechanism includes a closing assembly and an opening assembly, the energy storage mechanism includes an energy storage shaft and an energy storage spring, the energy storage shaft is provided with a first stop block cooperating with the closing assembly, an eccentrically arranged drive disc cooperating with the contact mechanisms, an opening head cooperating with the opening assembly and the contact mechanisms, and a gear transmission assembly drivingly connected to the contact mechanisms, the energy storage shaft is also provided with a first crank arm connected to the energy storage spring, the other end of the energy storage spring is connected to the partition plate, and the closing assembly, the opening assembly, the three contact mechanisms, and the energy storage mechanism are linked together.

[0007] Furthermore, the closing assembly includes a closing button, a first moving rod that moves horizontally, and a first limiting rod connected to one end of the first moving rod. A first return spring is sleeved on the first limiting rod, and a first slider that can move along the first limiting rod is disposed between the first return spring and the first limiting rod. The side of the first slider that is in contact with the first moving rod has a first moving guide surface. The first moving rod has a first sliding groove opened along its length. The other end of the first moving rod abuts against a locking hook. The upper side of the locking hook is rotatably mounted on a partition plate, and the hook portion of the locking hook abuts against a first stop block.

[0008] Furthermore, the tripping assembly includes a tripping button, a second moving rod, one end of which is connected to a second limiting rod. A second return spring is sleeved on the second limiting rod. A second slider, movable along the second limiting rod, is located between the second return spring and the second limiting rod. The side of the second slider that is in contact with the second moving rod has a second moving guide surface. The second moving rod has a second sliding groove opened along its length. The other end of the second moving rod abuts against a latch. The lower side of the latch is rotatably mounted on a partition plate via a pin shaft. A spring sheet is elastically supported between the upper side of the latch and the partition plate. A second stop block is fixed at the distal end of the pin shaft. The second stop block abuts against the tripping head.

[0009] Furthermore, the energy storage mechanism also includes an electric energy storage component and a manual energy storage component. The electric energy storage component includes a rotating shaft mounted on a partition plate. The gear transmission component includes a driving gear mounted on the rotating shaft and a driven gear on the energy storage shaft. A transmission belt is fitted on the driving gear and the driven gear. The electric energy storage component also includes an electric motor, which is connected to the rotating shaft in a transmission manner. The manual energy storage component includes an operating handle. A fourth crank arm is mounted on the rotating shaft. The end of the fourth crank arm is connected to the operating handle through an energy storage connecting rod. The lower side of the trip head abuts against a fifth crank arm on the rotating shaft. A sixth swing arm is also provided on the rotating shaft that abuts against the drive disc.

[0010] Furthermore, the partition is provided with an energy storage indicator plate, and the energy storage shaft is provided with a second crank arm that cooperates with the energy storage indicator plate. The bottom of one side of the energy storage indicator plate is connected to a first extension section. The bottom end of the first extension section is rotatably mounted on the partition via a linkage shaft. The first extension section is provided with a first swing arm that abuts against the second crank arm. The second crank arm is used to switch the energy storage indicator plate between the stored and unstored states.

[0011] Furthermore, the partition plate is provided with an opening / closing indicator plate, the energy storage shaft is provided with a second swing arm that cooperates with the opening / closing indicator plate, a limit plate is installed on the partition plate, the opening / closing indicator plate is slidably installed on the limit plate, and the opening / closing indicator plate is horizontally connected to a drive linkage. One end of the drive linkage has a contact foot that abuts against the second swing arm. The second swing arm is used to switch the opening or closing state on the opening / closing indicator plate.

[0012] Furthermore, the contact mechanism includes an arc-extinguishing chamber, a moving guide rod, and a stationary guide rod. The moving guide rod has a moving contact at one end of the arc-extinguishing chamber, and the stationary guide rod has a stationary contact at one end of the arc-extinguishing chamber. The arc-extinguishing chamber includes axially stacked arc-extinguishing grid plates, and the outer side of the arc-extinguishing grid plates is covered with an insulating cover. The other end of the moving guide rod is provided with a through-type current transformer, and the through-type current transformer is provided with an insulating baffle.

[0013] Furthermore, the contact mechanism also includes an interlocking assembly, which includes an interlocking element and an interlocking spring. The interlocking spring is used to drive the interlocking element to lock the moving contact in contact with the stationary contact. The interlocking element includes an interlocking shaft, on which a third crank arm is fixed. The end of the third crank arm is connected to the moving guide rod through a connecting rod assembly. One end of the interlocking spring is connected to the partition plate, and the other end is connected to the connecting rod assembly.

[0014] Furthermore, the energy storage shaft is also provided with a third swing arm, the partition is provided with a micro switch, and the micro switch and the third swing arm are provided with contacts.

[0015] Furthermore, a protection parameter setting panel and a display panel are installed above the base, and a circuit board connecting the protection parameter setting panel and the display panel is installed on the partition.

[0016] In summary, this utility model has the following advantages.

[0017] (1) The circuit breaker is divided into three contact system chambers by the base and partition, integrating the energy storage mechanism, contact mechanism and closing / opening mechanism to realize independent protection and system linkage of multi-phase circuits. The stop block, drive plate, opening head and gear transmission assembly on the energy storage shaft form a single-axis multi-control structure. With the cooperation of the closing assembly, opening assembly and energy storage mechanism, it is more labor-saving than the traditional method of manually operating the handle of the circuit breaker, and improves the convenience of operation.

[0018] (2) The closing assembly drives the first moving rod through the closing button. The sliding guide surface and the first reset spring cooperate to convert the operating force into a stable horizontal displacement, reducing the force required for manual closing. The mechanical locking structure of the locking hook and the stop block ensures the reliable locking of the energy storage spring, avoiding accidental opening caused by external vibration. At the same time, it provides stable closing power for the contact mechanism, solving the problem of continuous force required for manual operation of traditional circuit breakers, and improving the convenience and safety of operation.

[0019] (3) The tripping assembly triggers the second moving rod via the tripping button. Through the locking structure of the second slider guide surface and the spring plate elastic support, the tripping action is quickly responded to and the status is locked. The locking is linked to the second stop block through the plug shaft, releasing the tripping head to drive the contact mechanism to disconnect. The tripping can be completed without additional force. The elastic support of the spring plate ensures that the locking is stably reset after tripping, forming a mechanical interlock to prevent accidental closing and improve the reliability and safety of the tripping operation.

[0020] (4) The energy storage shaft drives the energy storage indicator plate through the second crank arm. Through the mechanical linkage of the linkage shaft and the first swing arm, the energy storage status is displayed in real time. Users can judge whether the circuit breaker has the conditions for closing by visually observing the status of the indicator plate. The energy storage shaft links the opening and closing indicator plate through the second swing arm. Through the cooperation of the drive linkage and the contact foot, the on and off status of the contact mechanism is converted into a visual signal of the indicator plate, which makes it easy for maintenance personnel to quickly confirm the on and off status of the circuit. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of a circuit breaker.

[0022] Figure 2 This is a schematic diagram of the internal structure of a circuit breaker.

[0023] Figure 3 This is a left-side view of the internal structure of the circuit breaker.

[0024] Figure 4 This is a right-side view of the internal structure of the circuit breaker.

[0025] Figure 5 This is a top view of the internal structure of the circuit breaker.

[0026] Figure 6This is a schematic diagram of a partial structure of a circuit breaker.

[0027] Figure 7 for Figure 6 Side view of the circuit breaker.

[0028] Figure 8 for Figure 7 A partial structural diagram of a circuit breaker. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the embodiments.

[0030] In practical implementation: such as Figures 1 to 8 As shown, a circuit breaker includes a base 1 and a partition 11 that are arranged side by side to form three contact system cavities. Each contact system cavity is equipped with an energy storage mechanism 2, three contact mechanisms 3, and a closing / opening mechanism 4 for controlling the connection or disconnection of the contact mechanisms 3. The closing / opening mechanism 4 includes a closing assembly 41 and an opening assembly 42. The energy storage mechanism 2 includes an energy storage shaft 21 and an energy storage spring 22. The energy storage shaft 21 is provided with a first stop block 419 that cooperates with the closing assembly 41, an eccentrically arranged drive disk 212 that cooperates with the contact mechanisms 3, an opening head 213 that cooperates with the opening assembly 42 and the contact mechanisms 3, and a gear transmission assembly 214 that is drively connected to the contact mechanisms 3. The energy storage shaft 21 is also provided with a first crank arm 215 that is connected to the energy storage spring 22. The other end of the energy storage spring 22 is connected to the partition 11. The closing assembly 41, the opening assembly 42, the three contact mechanisms 3, and the energy storage mechanism 2 are linked together. The partition 11 is equipped with a limiting block 111 for limiting the first crank arm 215 after the energy storage spring 22 releases its energy.

[0031] The closing assembly 41 includes a closing button 411, a horizontally movable first moving rod 412, and a first limiting rod 413 connected to one end of the first moving rod 412. A first return spring 414 is sleeved on the first limiting rod 413. A first slider 415 that can move along the first limiting rod 413 is inserted between the first return spring 414 and the first limiting rod 413. The side of the first slider 415 that is in contact with the first moving rod 412 has a first moving guide surface 416. The first moving rod 412 has a first sliding groove 417 opened along the length direction. The other end of the first moving rod 412 abuts against a locking hook 418. The upper side of the locking hook 418 is rotatably mounted on the partition 11. The hook part of the locking hook 418 abuts against a first stop block 419.

[0032] The tripping assembly 42 includes a tripping button 421, a second moving rod 422, one end of which is connected to a second limiting rod 423. A second return spring 424 is sleeved on the second limiting rod 423. A second slider 425, movable along the second limiting rod 423, passes between the second return spring 424 and the second limiting rod 423. The side of the second slider 425 that is in contact with the second moving rod 422 has a second moving guide surface 426. The second moving rod 422 has a first opening along its length. The second sliding groove 427, the other end of the second moving rod 422 abuts against the latch 428, the lower side of the latch 428 is rotatably mounted on the partition 11 via a plug shaft, and a spring sheet 429 is elastically supported between the upper side of the latch 428 and the partition 11. The far end of the plug shaft is fixed with a second stop block 430, the second stop block 430 abuts against the opening head 213, the lower side of the opening head 213 abuts against the fifth crank arm 3812 on the rotating shaft 381, and the rotating shaft 381 is also provided with a sixth swing arm 3813 that abuts against the drive disc 212.

[0033] An energy storage indicator plate 5 is provided on the partition 11. A second crank arm 216 cooperating with the energy storage indicator plate 5 is provided on the energy storage shaft 21. A first extension section 51 is connected to one bottom side of the energy storage indicator plate 5. The bottom end of the first extension section 51 is rotatably mounted on the partition 11 via a linkage shaft 52. A first swing arm 53 abutting against the second crank arm 216 is provided on the first extension section 51. The second crank arm 216 is used to switch the energy storage indicator plate 5 between the stored and unstored states. The energy storage shaft 21 drives the energy storage indicator plate 5 through the second crank arm 216. Through the mechanical linkage between the linkage shaft 52 and the first swing arm 53, the energy storage status (stored / unstored) is displayed in real time. This purely mechanical indication system does not rely on electrical signals and is not affected by power outages or circuit faults. Maintenance personnel can intuitively observe the status of the indicator plate to determine whether the circuit breaker has the conditions for closing, avoiding operational failures due to insufficient energy storage and improving the convenience and accuracy of equipment status monitoring.

[0034] A circuit breaker indicator 6 is mounted on the partition 11. A second swing arm 217, which cooperates with the circuit breaker indicator 6, is mounted on the energy storage shaft 21. A limit plate is installed on the partition 11, and the circuit breaker indicator 6 is slidably mounted on the limit plate. The circuit breaker indicator 6 is horizontally connected to a drive linkage 61. One end of the drive linkage 61 has a contact 62 that abuts against the second swing arm 217. The second swing arm 217 is used to switch the circuit breaker indicator 6 between open and closed states. The energy storage shaft 21, through the second swing arm 217, links the circuit breaker indicator 6. The cooperation between the drive linkage 61 and the contact 62 converts the on / off state of the contact mechanism 3 into a visual signal on the indicator plate. The indicator plate is slidably mounted on the limit plate, completely synchronized with the contact movement, and can maintain status display without power support. This solves the problem that the status of traditional circuit breakers cannot be checked after power failure, making it easier for maintenance personnel to quickly confirm the circuit's on / off status and reducing the risk of misoperation.

[0035] The contact mechanism 3 includes an arc-extinguishing chamber 31, a moving guide rod 32, and a stationary guide rod 33. The moving guide rod 32 is slidably mounted on the base 1 via a limiting member fixed on the base 1. A moving contact 321 is provided at one end of the moving guide rod 32 located in the arc-extinguishing chamber 31, and a stationary contact 331 is provided at one end of the stationary guide rod 33 located in the arc-extinguishing chamber 31. The arc-extinguishing chamber 31 includes axially stacked arc-extinguishing grid plates 34, with an insulating cover 35 covering the outer side of each arc-extinguishing grid plate 34. A through-type current transformer 36 is provided at the other end of the moving guide rod 32, and the through-type current transformer 36 is equipped with an insulating baffle 37. The arc-extinguishing chamber 31 of the contact mechanism 3 adopts an axially stacked arc-extinguishing grid plate 34 and insulating cover 35 structure, effectively shortening the arc path and improving arc-extinguishing efficiency. The moving guide rod 32 is equipped with a through-type current transformer 36 and an insulating baffle 37, which enhances insulation performance while enabling real-time current monitoring. This design reduces the risk of arcing during opening and closing, extends the service life of the contacts, and the current transformer provides signal support for the protection device, enabling accurate detection of overload and short circuit, and adapting to the protection needs of different load scenarios.

[0036] The contact mechanism 3 also includes an interlocking assembly, which includes an interlocking element 38 and an interlocking spring 39. The interlocking spring 39 is used to drive the interlocking element 38 to lock the moving contact 321 in contact with the stationary contact 331. The interlocking element 38 includes an interlocking shaft 381, on which a third crank arm 3811 is fixed. The end of the third crank arm 3811 is connected to the moving guide rod 32 through a connecting rod assembly 382. One end of the interlocking spring 39 is connected to the partition plate 11, and the other end is connected to the connecting rod assembly 382. The connecting rod assembly 382 includes a first connecting rod 3821 and a second connecting rod 3822. The end of the third crank arm 3811 is hinged to the first connecting rod 3821, and the other end of the first connecting rod 3821 is hinged to the second connecting rod 3822. The other end of the second connecting rod 3822 is connected to the moving guide rod 32. The interlocking assembly of the contact mechanism 3 drives the interlocking member 38 through the interlocking spring 39, and connects to the moving guide rod 32 through the connecting rod assembly 382, ​​locking the moving contact 321 in the open state, that is, it cannot contact the stationary contact 331.

[0037] The energy storage mechanism 2 also includes an electric energy storage component 23 and a manual energy storage component 24. The electric energy storage component 23 includes a rotating shaft 231 mounted on the partition 11. The gear transmission component 214 includes a driving gear mounted on the rotating shaft 231 and a driven gear on the energy storage shaft 21. A transmission belt is fitted onto the driving gear and the driven gear. The electric energy storage component 23 also includes a motor 232, which is connected to the rotating shaft 231. The manual energy storage component 24 includes an operating handle 241. A fourth crank arm 2311 is mounted on the rotating shaft 231. The end of the fourth crank arm 2311 is connected to the operating handle 241 via an energy storage connecting rod 242. The energy storage mechanism 2 integrates the electric energy storage component 23 and achieves power switching through the gear transmission component 214. The manual energy storage component 24, in manual mode, utilizes the force-saving structure of the operating handle 241 and the connecting rod to allow operators to complete energy storage without applying excessive force, adapting to the operational needs in power outage environments or emergency scenarios, and improving the applicability and flexibility of the equipment.

[0038] A third swing arm 218 is also provided on the energy storage shaft 21, and a micro switch 112 is provided on the partition 11. The micro switch 112 and the third swing arm 218 are provided with contacts. The third swing arm 218 on the energy storage shaft 21 cooperates with the micro switch 112 on the partition 11 to convert the mechanical position of the energy storage shaft 21 into an electrical signal, such as an energy storage completion signal. In implementation, three micro switches 112 can be arranged in parallel, and the third swing arm 218 is provided with contacts that cooperate with the micro switches 112. This design provides real-time energy storage status feedback for the control system, supports automated control, such as remote monitoring of energy storage status and triggering closing conditions. At the same time, it can detect faults in the energy storage mechanism 2 through abnormal electrical signals, thereby improving the intelligence level and fault self-diagnosis capability of the circuit breaker.

[0039] A circuit board 113 is mounted on the partition 11. A protection parameter setting panel 12 and a display panel 13 are mounted above the base 1. The display panel 13 and the protection parameter setting panel 12 are connected to the circuit board 113. It supports on-site setting and status display of protection parameters, such as overload long delay and short circuit short delay. iR / A represents the rated current setting, used to set the rated current of the circuit breaker, which determines the allowable current during normal operation. tR / S represents the long delay trip time setting, setting the operating time of the long delay trip unit. It is the time set for the circuit breaker to trip after the current exceeds a certain multiple of the rated current for a certain duration, used for overload protection. Isd*IR is the short circuit short delay current multiple setting, used to set the multiple of the short circuit short delay trip current to the rated current. tSd / s represents the short circuit short delay trip time setting, used to set the trip time for short circuit short delay.

[0040] During implementation, protective covers are installed on the trip button 421, the close button 411, the protection parameter setting panel 12, and the display panel 13.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A circuit breaker comprising a base and three contact system cavities separated by a partition plate, characterized in that, The contact system cavity is equipped with an energy storage mechanism, three contact mechanisms, and a closing / opening mechanism for controlling the connection or disconnection of the contact mechanisms. The closing / opening mechanism includes a closing assembly and a opening assembly. The energy storage mechanism includes an energy storage shaft and an energy storage spring. The energy storage shaft is provided with a first stop block that cooperates with the closing assembly, an eccentrically positioned drive disc that cooperates with the contact mechanisms, an opening head that cooperates with the opening assembly and the contact mechanisms, and a gear transmission assembly that is drively connected to the contact mechanisms. The energy storage shaft is also provided with a first crank arm that is connected to the energy storage spring. The other end of the energy storage spring is connected to a partition. The closing assembly, the opening assembly, the three contact mechanisms, and the energy storage mechanism are linked together.

2. The circuit breaker according to claim 1, characterized in that, The closing assembly includes a closing button, a horizontally movable first moving rod, and a first limiting rod connected to one end of the first moving rod. A first return spring is sleeved on the first limiting rod, and a first slider that can move along the first limiting rod is disposed between the first return spring and the first limiting rod. The side of the first slider that is in contact with the first moving rod has a first moving guide surface. The first moving rod has a first sliding groove opened along its length. The other end of the first moving rod abuts against a locking hook. The upper side of the locking hook is rotatably mounted on a partition plate, and the hook portion of the locking hook abuts against a first stop block.

3. The circuit breaker according to claim 2, characterized in that, The tripping assembly includes a tripping button, a second moving rod, one end of which is connected to a second limiting rod. A second return spring is fitted onto the second limiting rod. A second slider, movable along the second limiting rod, is located between the second return spring and the second limiting rod. The side of the second slider that is in contact with the second moving rod has a second moving guide surface. The second moving rod has a second sliding groove opened along its length. The other end of the second moving rod abuts against a latch. The lower side of the latch is rotatably mounted on a partition plate via a pin shaft. A spring sheet is elastically supported between the upper side of the latch and the partition plate. A second stop block is fixed at the distal end of the pin shaft, and the second stop block abuts against the tripping head.

4. The circuit breaker according to claim 3, characterized in that, The energy storage mechanism further includes an electric energy storage component and a manual energy storage component. The electric energy storage component includes a rotating shaft mounted on a partition. The gear transmission component includes a driving gear mounted on the rotating shaft and a driven gear on the energy storage shaft. A transmission belt is fitted on the driving gear and the driven gear. The electric energy storage component also includes an electric motor, which is connected to the rotating shaft in a transmission manner. The manual energy storage component includes an operating handle. A fourth crank arm is mounted on the rotating shaft. The end of the fourth crank arm is connected to the operating handle through an energy storage connecting rod. The lower side of the trip head abuts against a fifth crank arm on the rotating shaft. A sixth swing arm is also provided on the rotating shaft that abuts against the drive disc.

5. The circuit breaker according to claim 1, characterized in that, The partition is provided with an energy storage indicator plate, and the energy storage shaft is provided with a second crank arm that cooperates with the energy storage indicator plate. The bottom of one side of the energy storage indicator plate is connected to a first extension section. The bottom end of the first extension section is rotatably mounted on the partition plate through a linkage shaft. The first extension section is provided with a first swing arm that abuts against the second crank arm. The second crank arm is used to switch the energy storage indicator plate between the stored energy and unstored energy states.

6. The circuit breaker according to claim 1, characterized in that, The partition is provided with an opening / closing indicator plate, and the energy storage shaft is provided with a second swing arm that cooperates with the opening / closing indicator plate. A limit plate is installed on the partition, and the opening / closing indicator plate is slidably installed on the limit plate. The opening / closing indicator plate is horizontally connected to a drive linkage. One end of the drive linkage has a contact foot that abuts against the second swing arm. The second swing arm is used to switch the opening or closing state on the opening / closing indicator plate.

7. The circuit breaker according to claim 1, characterized in that, The contact mechanism includes an arc-extinguishing chamber, a moving guide rod, and a stationary guide rod. The moving guide rod has a moving contact at one end of the arc-extinguishing chamber, and the stationary guide rod has a stationary contact at one end of the arc-extinguishing chamber. The arc-extinguishing chamber includes axially stacked arc-extinguishing grid plates, and the outer side of the arc-extinguishing grid plates is covered with an insulating cover. The other end of the moving guide rod is provided with a through-type current transformer, and the through-type current transformer is provided with an insulating baffle.

8. The circuit breaker according to claim 7, characterized in that, The contact mechanism further includes an interlocking assembly, which includes an interlocking element and an interlocking spring. The interlocking spring is used to drive the interlocking element to lock the moving contact in contact with the stationary contact. The interlocking element includes an interlocking shaft, on which a third crank arm is fixed. The end of the third crank arm is connected to the moving guide rod through a connecting rod assembly. One end of the interlocking spring is connected to the partition plate, and the other end is connected to the connecting rod assembly.

9. The circuit breaker according to claim 1, characterized in that, The energy storage shaft is also provided with a third swing arm, and the partition is provided with a micro switch. The micro switch and the third swing arm are provided with contacts.

10. The circuit breaker according to claim 1, characterized in that, A protection parameter setting panel and a display panel are installed above the base, and a circuit board connecting the protection parameter setting panel and the display panel is installed on the partition.

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