A trip reset device for a circuit breaker
By setting an interactive boss between the circuit breaker handle and the trip latch, the problem of the trip latch sliding out during the rapid closing process of the circuit breaker is solved, the reliable reset of the tripping device is realized, and the reliability and performance of the circuit breaker are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG RUITAN DIGITAL ENERGY CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-07-31
AI Technical Summary
Existing circuit breakers are prone to tripping during rapid or oblique closing, and the tripping clips are easy to slip out. The reset device requires an external button, which increases the parts and cost and affects the breaking speed of the moving contact.
By setting interactive bosses on the handle and the release buckle, the handle boss and the release buckle boss interact when the handle rotates within a predetermined angle range, preventing the release buckle from slipping out and achieving reliable reset of the release device without adding any parts.
It improves the reliability of the circuit breaker's tripping mechanism, reduces parts costs, increases assembly efficiency and the performance stability of the circuit breaker, and ensures reliable disconnection under fault conditions.
Smart Images
Figure CN224582234U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a tripping and reset device for a circuit breaker. Background Technology
[0002] As a crucial component of power systems, circuit breakers reliably disconnect circuits under faults such as overload, short circuit, and leakage current, protecting personnel and equipment safety. However, prolonged operation and various environmental factors can lead to faults such as slippage, tripping, and failure to operate. To improve the reliability of fault tripping, existing circuit breakers often incorporate auxiliary tripping devices with different structural forms, such as permanent magnet structures, spring energy storage structures, and electromagnetic trip units. However, all of these auxiliary tripping devices have drawbacks in practical applications, significantly impacting product performance.
[0003] 1. In actual applications of existing circuit breakers, during the process of rapid closing or oblique closing, the tripping mechanism is prone to bouncing, and the tripping latch is prone to slipping out of the latching position, causing the circuit breaker to slip.
[0004] 2. The existing circuit breaker tripping device reset uses an external button. This structure requires the addition of multiple parts, which not only increases the cost of the circuit breaker and affects assembly efficiency, but also occupies internal space of the circuit breaker.
[0005] 3. The existing circuit breaker tripping device reset is driven by the opening of the moving contact, which affects the breaking speed of the moving contact and the performance of the circuit breaker.
[0006] For example, patent CN112242275B discloses a reset device for a circuit breaker built-in electromagnetic trip unit. During the return process of the moving contact base frame, it can use the push rod reset component to hit the push rod, causing the push rod to retract to its original position. That is, the return of the moving contact during opening drives the reset of the circuit breaker's built-in electromagnetic trip unit. This utility model affects the breaking speed of the moving contact and affects the performance of the circuit breaker. Utility Model Content
[0007] Based on the above background, in order to solve at least one of the above problems, this utility model provides a circuit breaker tripping and reset device, which can improve the reliability of the circuit breaker tripping device and overcome the above problems.
[0008] This utility model provides a tripping and reset device for a circuit breaker, comprising at least an operating mechanism and a tripping device. The circuit breaker includes a moving contact device. The operating mechanism includes at least a handle and a connecting rod. The tripping device includes at least a latch and a trip latch. The tripping device is mounted on the moving contact device. The operating mechanism drives the moving contact device to rotate through the tripping device to realize the opening and closing operation of the circuit breaker. The outer circumferential surface of the handle is provided with a handle boss, and the outer arc surface of the trip latch is provided with a trip latch boss. When the circuit breaker is opening or closing, when the handle rotates to a predetermined angle range, the handle boss tangentially abuts against the trip latch boss, preventing the latch from disengaging from the latch position. When the circuit breaker is freely tripped due to a fault, the handle boss and the trip latch boss move away from each other.
[0009] In this way, without adding any parts, by setting interactive bosses on the handle and the trip latch, during the circuit breaker closing process, when the handle rotates within a predetermined angle range, the handle boss abuts against the trip latch boss, preventing the trip latch from sliding out of the locking position. The locking and trip latch remain in the locked state, preventing the circuit breaker from slipping. When the handle rotates outside the predetermined angle range, the handle boss and the trip latch boss move away from each other, allowing the tripping device to freely trip, ensuring reliable disconnection in the circuit breaker fault state. When the circuit breaker trips freely due to a fault, i.e., during the fault tripping stage after the circuit breaker is turned on or during the reset stage after the circuit breaker has tripped freely due to a fault, the handle boss and the trip latch boss move away from each other, ensuring the safe use of the circuit breaker in the fault state, effectively improving the stability of the circuit breaker mechanism and enhancing the quality of the circuit breaker.
[0010] In some embodiments, the handle body is cylindrical, and a pivot point is provided at the center of the handle body. The handle is rotatably mounted inside the circuit breaker via the pivot point.
[0011] In the above embodiment, the main body of the handle is cylindrical, and a rotation fulcrum is provided at the center of the main body of the handle. The rotation fulcrum is perpendicular to the end face of the main body of the handle. The rotation fulcrum is rotatably disposed inside the circuit breaker, and the handle can rotate around the rotation fulcrum, making the handle rotation more precise and improving the stability of the operating mechanism.
[0012] In some embodiments, the handle boss is one of a triangle, trapezoid, or square shape, and the outer edge of the handle boss is provided with an arc surface that abuts against the jump buckle boss. The angle between the line connecting the center of the arc surface and the center of the rotation fulcrum and the center line of the operating handle is b, where b is any angle between 115° and 120°.
[0013] In the above embodiments, the handle protrusion is one of a triangle, trapezoid, or square. The bottom of the handle protrusion is connected to the handle body as a whole. The outer edge of the handle protrusion has an arc surface. The angle between the line connecting the center of the arc surface of the handle protrusion and the center of the handle body and the center line of the operating handle is set to b. The handle protrusion is set in any angle range between 115° and 120°. On the one hand, this helps the handle protrusion to move away from the trip latch and the trip latch protrusion and reliably reset when the circuit breaker trips freely due to a fault. On the other hand, when the circuit breaker is closed to a predetermined angle range, the arc surface of the handle protrusion acts on the trip latch protrusion, preventing the trip latch from sliding out of the locking position. The arc of the handle protrusion can reduce the friction between the handle protrusion and the trip latch protrusion, making the handle operation smoother.
[0014] In some embodiments, the buckle protrusion is one of a triangle, trapezoid, or square, and the outer surface of the buckle protrusion has a contact surface that tangentially abuts against the arc surface of the handle protrusion.
[0015] In the above embodiments, the trip latch is roughly fan-shaped, and the trip latch boss can be set as one of triangle, trapezoid, or square. The bottom of the trip latch boss is connected to the outer arc surface of the trip latch to form a whole. The trip latch boss can meet the requirement that when the handle is rotated to a predetermined angle range during the circuit breaker closing process, it abuts against the handle boss to avoid slippage. At the same time, it can meet the requirement that the handle boss moves away from the circuit breaker during the initial stage of circuit breaker closing and after the moving contact and stationary contact are in contact and conduction, so as to ensure reliable reset of the circuit breaker tripping device and reliable tripping under fault conditions.
[0016] In some embodiments, the other end of the jump buckle along the outer arc surface is provided with a driven part, and the inclined surface of the jump buckle near the end of the jump buckle boss in the thickness direction is provided with a latching part, and the jump buckle is engaged with the lock buckle through the latching part.
[0017] In the above embodiment, the trip buckle is fan-shaped, with a driven part at one end along the outer arc surface and a trip buckle boss at the other end. A latching part is provided on the inclined surface near the end of the trip buckle boss in the thickness direction of the trip buckle part. The trip buckle engages with the lock buckle through the latching part to lock or unlock the tripping device, thereby realizing the switching between the four-bar linkage operating mechanism and the five-bar linkage operating mechanism of the circuit breaker.
[0018] In some embodiments, the center of the jumper is provided with a pivot point, and the jumper is rotatably mounted on the moving contact device via the pivot point.
[0019] In the above embodiment, the jump buckle is roughly fan-shaped, and a rotation center hole is provided at the center of the jump buckle. The jump buckle is sleeved on the fixed shaft of the moving contact device through the rotation center hole. The jump buckle can rotate around the fixed shaft and engage with the lock buckle to realize the locking or unlocking of the release device, thereby improving the reliability of the release device.
[0020] In some embodiments, when the handle rotates within the predetermined angle range, the arcuate surface of the handle boss always tangentially abuts against the contact surface of the snap fastener boss.
[0021] In the above embodiment, when the handle rotates within the predetermined angle range, the arc surface of the handle boss always tangentially abuts against the contact surface of the trip buckle boss, ensuring that the operating mechanism rotates normally during the circuit breaker closing process while preventing the latch from disengaging from the latch position, thus avoiding slippage.
[0022] In some embodiments, the tripping device further includes a tripping spring, which is elastically disposed between the tripping buckle and the moving contact device.
[0023] In the above embodiments, the tripping device includes a tripping return spring, which is elastically disposed between the tripping buckle and the moving contact device to keep the tripping buckle rotating in the locking direction, thereby avoiding slippage caused by the tripping buckle failing to reset or not resetting properly, and improving the reliability of the operating mechanism.
[0024] In some embodiments, during the closing, opening, and free tripping processes of the circuit breaker, after the handle boss and the trip buckle boss move away from each other, the trip buckle is reset by the trip buckle reset spring or remains in the locked position.
[0025] In the above embodiments, during the closing and opening processes of the circuit breaker, when the handle boss and the trip latch boss move away from each other, the trip latch is held in the locked position by the trip latch return spring. During the free tripping process of the circuit breaker, after the handle boss and the trip latch boss move away from each other, the trip latch is reset by the trip latch return spring and held in the locked position, improving the reliability of the tripping device.
[0026] In some embodiments, the rotation angle of the handle is α, and the predetermined angle range is the angle range between a first predetermined angle and a second predetermined angle. During the circuit breaker opening and closing operation, when 0 ≤ α ≤ the first predetermined angle, the handle boss and the trip latch boss move away from each other; when the first predetermined angle < α < the second predetermined angle, the handle boss tangentially abuts against the trip latch boss, preventing the latch from disengaging from the latch position; when the second predetermined angle ≤ α ≤ the closing completion angle, the handle boss and the trip latch boss move away from each other.
[0027] In the above embodiments, during the operation of the circuit breaker by the handle to close or open the circuit breaker, when the operating handle is rotated to the initial position and within the first predetermined angle range, the handle protrusion and the trip latch protrusion move away from each other. When the operating handle is rotated to the first predetermined angle and within the circuit breaker conduction position range, the handle protrusion and the trip latch protrusion remain tangentially abutting each other. The handle keeps the trip latch in the locked position so that the latch cannot disengage from the latch position, thus preventing the circuit breaker from slipping. When the operating handle is rotated to the second predetermined angle position and within the closing completion position range, the handle protrusion and the trip latch protrusion move away from each other. During this stage, the trip latch can be rotated to unlock the tripping device, ensuring the safety of closing under circuit breaker fault conditions.
[0028] In some embodiments, the first predetermined angle is any angle between 20° and 25°, and the second predetermined angle is any angle between 55° and 60°. After the handle is rotated to the second predetermined angle position, the moving and stationary contacts of the circuit breaker begin to make contact and conduct.
[0029] In the above embodiments, when the operating handle is rotated to the initial position and within the first predetermined angle range, that is, when the handle rotation angle is 0≤α≤20° or 0≤α≤25°, the handle boss and the tripping boss are far apart from each other. When the handle is rotated to the second predetermined angle position, that is, when the handle is rotated to any angle between 55°≤α≤60°, the moving and stationary contacts of the circuit breaker begin to make contact and conduct. The first predetermined angle range is set to ensure that the tripping device can reliably reset and reach the locking state again after free tripping. The second predetermined angle is set to ensure reliable tripping in the circuit breaker fault state, ensuring safe use.
[0030] The beneficial effects of this utility model are as follows:
[0031] 1. This utility model achieves the reset function of the tripping device by setting a protrusion that interacts with the handle and the tripping buckle, avoiding slippage caused by the tripping buckle not being able to reset or not being reset in place, thus improving the reliability of the tripping mechanism and enhancing the quality of the circuit breaker;
[0032] 2. This utility model uses a protrusion that interacts with the handle and the trip latch. During the circuit breaker closing process, the protrusion on the handle acts on the protrusion on the trip latch to prevent slippage and improve the reliability of the mechanism. The reliability of the tripping mechanism is achieved without setting external buttons or adding any parts, which effectively reduces the cost of parts and improves assembly efficiency.
[0033] 3. This utility model features interactive protrusions on the handle and trip latch, allowing the circuit breaker to be manually reset via the handle during closing. This does not affect the breaking speed of the moving contact during fault tripping of the circuit breaker, effectively improving the tripping margin of the circuit breaker's built-in magnetic assisted tripping structure, built-in energy storage mechanism, and built-in trip device, thus effectively improving the circuit breaker's performance. Attached Figure Description
[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0035] Figure 1 This is a structural diagram of the tripping and reset device of the circuit breaker in the open state according to this utility model;
[0036] Figure 2 This is a structural diagram of the tripping and reset device of the circuit breaker of this utility model when it rotates to the first preset angle;
[0037] Figure 3 This is a structural diagram of the tripping and reset device of the circuit breaker of this utility model when it rotates to the second preset angle;
[0038] Figure 4 This is a structural diagram of the trip reset device for the circuit breaker in case of a fault trip.
[0039] Figure 5 This is a structural diagram of the handle of this utility model;
[0040] Figure 6 This is a structural diagram of the jump buckle of this utility model. Detailed Implementation
[0041] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this utility model. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0042] In the description of embodiments of this disclosure, the term "comprising" and similar terms should be understood as open-ended inclusion, i.e., "including but not limited to". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.
[0043] Example 1
[0044] Please refer to Figure 1 This utility model provides a tripping and reset device for a circuit breaker, comprising at least an operating mechanism 20 and a tripping device 30. The circuit breaker also includes a moving contact device 60. The operating mechanism 20 includes at least a handle 201 and a connecting rod 202. The tripping device 30 includes at least a latch 302, a trip latch 301, and a trip latch spring 303. The connecting rod 202 connects the handle 201 and the latch 302. The trip latch 301 and the latch 302 are overlapped and rotatably connected to the moving contact device 60. The operating mechanism 20 drives the moving contact device 60 to rotate through the tripping device 30, thereby realizing the opening and closing operation of the circuit breaker.
[0045] Please refer to Figure 5 The handle 201 includes a cylindrical handle body 2012 and an operating handle 2013 extending along the outer circumferential surface of the handle body 2012. The operating handle 2013 is rod-shaped and is connected to the handle body 2012 as a whole. A rotating hole 2014 is provided on the handle body 2012. The rotating hole 2014 is perpendicular to the end face of the handle body 2012 and located at the edge of the handle body. A portion of the outer wall of the rotating hole 2014 has an arc surface extending beyond the outer circumferential surface of the handle body 2012. A handle boss 2015 is provided on the outer circumferential surface of the handle body 2012. The handle boss 2015 is located near the rotating hole 2014 and is located at the edge of the rotating hole. Between the hole 2014 and the operating handle 2013, the handle boss 2015 is approximately triangular in shape. The bottom of the handle boss is connected to the handle body 2012 as a whole. The top of the outer edge of the handle boss is provided with an arc surface 2016. The center of the handle body 2012 is provided with a rotation fulcrum 2011. The rotation fulcrum 2011 is perpendicular to the end face of the handle body 2012. In this embodiment, the angle b between the line connecting the center of the arc surface to the center of the rotation fulcrum 2011 and the center line of the operating handle 2013 is 116°. The handle is rotatably mounted in the circuit breaker through the rotation fulcrum 2011, and the handle 201 can rotate around the rotation fulcrum 2011.
[0046] Please refer to Figure 6The snap fastener 301 is generally fan-shaped and includes a main body, a driven part 3012 located at one end of the outer arc edge of the main body, a snap fastener boss 3014 located at the other end of the main body, and a rotation center hole 3015 located approximately at the center of the main body. The snap fastener 301 rotates around the rotation center hole 3015. The end face of the main body near the snap fastener boss 3014 forms a latching part 3013, which is part of the main body. Along the thickness direction, the driven part 3012 is arc-shaped with a hollow structure, partially extending beyond the outer arc surface of the main body. The jump buckle boss 3014 is approximately trapezoidal in shape. The bottom of the jump buckle boss is connected to the outer arc surface of the main body to form a whole. The side of the jump buckle boss is provided with a contact surface 3016 that tangentially abuts against the handle boss. The jump buckle 301 is sleeved on the rotating shaft of the moving contact device 60 through a rotating center hole 3015. The jump buckle 301 can rotate around the rotating shaft.
[0047] Please continue to refer to this. Figure 1 , Figure 1 When the circuit breaker is in the open state, the handle 201 is rotatably fixed inside the circuit breaker via the pivot point 2011. The handle 201 is hinged to the latch 302 via the connecting rod 202. The trip latch 301 and the latch 302 are synchronously rotated inside the circuit breaker via the rotating shaft 601 with the moving contact device 60. When the trip latch 301 and the latch 302 are locked, the handle 201, the connecting rod 202, the moving contact device 60, and the latch 302 form a four-bar linkage. The handle 301 is driven by force to rotate the moving contact device 60 through the four-bar linkage. Before the handle rotates to the first predetermined angle during the process from the open state to the closed state of the circuit breaker, the handle boss 2015, the trip latch 301, and the trip latch boss 3014 are far apart from each other.
[0048] Please refer to Figure 2When the circuit breaker is in the closing process, when the handle rotates from the initial position to the first predetermined angle of 23°, that is, when the handle rotates within the angle range of 0≤α≤23°, the handle 301 rotates to drive the moving contact device 60 to rotate. The handle 201 is subjected to force and rotates counterclockwise, driving the moving contact device 60, the trip latch 301, and the locking latch 302 to rotate clockwise simultaneously. The handle boss 2015 and the trip latch boss 3014 are far apart from each other and do not interfere with each other. When the handle 201 rotates from the "OFF" initial position to the first predetermined angle of 23°, that is, α>23°, at this time, the handle boss 2015 begins to act on the trip latch boss 3014. The handle boss 2015 has an arc of 2°. 016 As the handle continues to rotate, it tangentially abuts against the contact surface 3016 of the trip latch boss 3014, keeping the trip latch 301 and the locking latch 302 locked. As the handle continues to rotate, within the range of the rotation angle from greater than the first predetermined angle to the second predetermined angle position, that is, when the handle rotates within the angle range of 23° < α < 57°, the handle boss always acts on the trip latch boss, keeping the trip latch in the locked position, preventing the circuit breaker from slipping. On the one hand, this effectively improves the stability of the circuit breaker's tripping mechanism, and on the other hand, it also improves the tripping margin of the circuit breaker's energy storage mechanism and tripping mechanism, enhancing the tripping consistency and reliability of the circuit breaker, and effectively improving the quality of the circuit breaker.
[0049] Please refer to Figure 3 When the circuit breaker is in the closing process, when the handle rotates from the initial position to the second predetermined angle position of 57°, the moving contact and stationary contact of the circuit breaker begin to contact and are in the closing and conducting stage. That is, when the handle rotates within the range of 57°≤α≤closing completion position, the handle 301 drives the moving contact device 60 to rotate until the circuit breaker contacts are closed and conducting. The handle boss 2015 and the trip buckle boss 3014 are far apart from each other and do not interfere with each other. When the circuit breaker has a short circuit fault, the trip buckle 301 is driven by the fault trip device to drive the driven part 3012 to make the trip buckle 301 rotate counterclockwise and disengage from the latch 302 to unlock. That is, from the start of the circuit breaker closing and conducting to the circuit breaker being fully closed to the "ON position", the handle boss and the trip buckle boss are far apart from each other. The trip buckle can rotate to unlock the trip device under the action of the fault trip device, ensuring the safety of the circuit breaker opening under fault conditions.
[0050] Please refer to Figure 4When the circuit breaker is in the free tripping stage, after the circuit breaker has tripped due to a fault, the trip latch 301 and the latch 302 unlock. The moving contact device 60 rotates counterclockwise to the open position under the drive of the moving contact spring. The handle 201, connecting rod 202, and latch 302 rotate clockwise to the OFF position under the drive of the handle spring. Since the spring force of the moving contact spring is much greater than the spring force of the handle spring, in the initial stage after unlocking and free tripping, the latch 302 is hinged to the moving contact device 60 and rotates clockwise. The linkage mechanism of the circuit breaker changes from two hinge points to three hinge points, and the linkage mechanism of the circuit breaker changes from four links to five links. Next, driven by the spring force of the handle, the operating mechanism is reset again. The latch 302, hinged to the moving contact device 60, begins to rotate counterclockwise until the trip latch 301 and the latch 302 are reset, reaching the locked state again. At this time, the linkage mechanism of the circuit breaker changes from a five-bar linkage to a four-bar linkage. The force on the handle 301 can drive the moving contact device 60 to rotate through the four-bar linkage. During the above state transition process, the handle boss 2015 and the trip latch 301 are in a state of mutual distance, ensuring that the linkage mechanism of the circuit breaker can reliably reset after fault unlocking and tripping, and reach the four-bar linkage state again, ensuring the normal opening and closing of the circuit breaker.
[0051] The angle b between the line connecting the center of the arc surface of the handle boss to the center of the rotation fulcrum 2011 and the center line of the operating handle 2013 is any angle between 115° and 120°. During the closing process of the circuit breaker, the rotation angle of the handle is set to α. The first predetermined angle and the second predetermined angle are preset during the closing process of the handle rotation. The first predetermined angle is 20°≤α≤25°, and the second predetermined angle is 55°≤α≤60°. The first and second predetermined angles of the handle boss position angle b and the handle rotation angle a can achieve the same technical effect when other angles within the above angle range are used. They will not be elaborated here. Different angle values can be set according to actual needs.
[0052] This invention may be implemented in other specific forms without departing from its spirit and essential characteristics. The present embodiments are to be regarded in all respects as exemplary rather than limiting, and the scope of this invention is defined by the appended claims rather than the foregoing description, and all modifications falling within the meaning of the claims and their equivalents are thus included within the scope of this invention.
Claims
1. A tripping and reset device for a circuit breaker, comprising at least an operating mechanism and a tripping device, wherein the circuit breaker includes a moving contact device, the operating mechanism includes at least a handle and a connecting rod, and the tripping device includes at least a latch and a trip latch, the tripping device being disposed on the moving contact device, and the operating mechanism driving the moving contact device to rotate via the tripping device to realize the opening and closing operation of the circuit breaker, characterized in that: The handle includes a handle body and an operating handle and a handle boss extending from the outer circular surface of the handle body. The end face edge of the handle body is provided with a rotating hole for connecting the connecting rod. The handle boss is located between the operating handle and the rotating hole on the side near the rotating hole. The jump catch is fan-shaped, and one end of the jump catch along the outer arc surface is provided with a jump catch boss that interacts with the handle boss. When the circuit breaker is opening or closing, when the handle is rotated to a predetermined angle range, the handle boss tangentially abuts against the jump catch boss, preventing the latch from disengaging from the latch position. When the circuit breaker is freely tripped due to a fault, the handle boss and the jump catch boss move away from each other.
2. A trip reset device for a circuit breaker according to claim 1, wherein: The main body of the handle is cylindrical, and a pivot point is provided at the center of the main body of the handle. The handle is rotatably mounted inside the circuit breaker through the pivot point.
3. A trip reset device for a circuit breaker according to claim 1 or 2, characterized in that: The handle protrusion is one of a triangle, trapezoid, or square. The outer edge of the handle protrusion has an arc surface that abuts against the jump buckle protrusion. The angle between the line connecting the center of the arc surface and the center of the rotation fulcrum and the center line of the operating handle is b, where b is any angle between 115° and 120°.
4. The circuit breaker trip reset device of claim 3, wherein: The buckle protrusion is one of a triangle, trapezoid, or square, and the side of the buckle protrusion has a contact surface that is tangent to and abuts against the arc surface of the handle protrusion.
5. The circuit breaker trip reset device of claim 1, wherein: The jump buckle has a driven part at the other end along the outer arc surface, and a latching part is provided on the inclined surface of the jump buckle near the end of the jump buckle boss in the thickness direction. The jump buckle is engaged with the lock buckle through the latching part.
6. The circuit breaker trip reset device of claim 1, wherein: The jump buckle is provided with a rotation fulcrum at its center, and the jump buckle is rotatably mounted on the moving contact device via the rotation fulcrum.
7. The circuit breaker trip reset device of claim 1, wherein: When the handle rotates within the predetermined angle range, the arc surface of the handle boss always tangentially abuts against the contact surface of the jump buckle boss.
8. The circuit breaker trip reset device of claim 1, wherein: The tripping device also includes a tripping spring, which is elastically disposed between the tripping buckle and the moving contact device.
9. The circuit breaker trip reset device of claim 8, wherein: During the closing, opening, and free tripping processes of the circuit breaker, after the handle boss and the trip buckle boss move away from each other, the trip buckle is reset by the trip buckle reset spring or remains in the locked position.
10. The circuit breaker trip reset device of claim 1, wherein: Let the rotation angle of the handle be α, and the predetermined angle range be the angle range between the first predetermined angle and the second predetermined angle. During the circuit breaker opening and closing operation, when 0≤α≤the first predetermined angle, the handle boss and the trip latch boss move away from each other; when the first predetermined angle<α<the second predetermined angle, the handle boss tangentially abuts against the trip latch boss, preventing the latch from disengaging from the latch position; when the second predetermined angle≤α≤the closing completion angle, the handle boss and the trip latch boss move away from each other.
11. The circuit breaker trip reset device of claim 10, wherein: The first predetermined angle is any angle between 20° and 25°, and the second predetermined angle is any angle between 55° and 60°. When the handle is rotated to the second predetermined angle position, the moving and stationary contacts of the circuit breaker begin to make contact and conduct.