Plug-in circuit breaker

Abstract

A plug-in circuit breaker comprises a housing, a button mechanism and an operating mechanism, wherein the button mechanism has a closing position and an opening position corresponding to the closing / opening state of the circuit breaker, and the circuit breaker further comprises a linkage member and a locking member arranged in the housing, wherein the linkage member is provided with an abutment boss, and the locking member is provided with a locking boss; when the button mechanism is in the closing position, the abutment boss of the linkage member extends out of the housing, and is restricted by the button mechanism in the extended position and cannot be retracted into the housing; when the button mechanism is in the opening position, the linkage member is retracted into the housing, and the locking boss of the locking member extends out of the housing, and the locking boss of the locking member can be pushed back into the housing by a retracting external force, thereby reliably preventing closing and plugging, avoiding the risk of live operation, and protecting the circuit breaker from falling out of a cabinet due to vibration during transportation and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage terminal electrical appliances, and particularly to a plug-in circuit breaker. Background Art

[0002] With the rapid development of network communication technology, especially the popularization of 5G network applications, the requirements for circuit breakers to effectively improve the safety of electrical equipment are getting higher and higher. The traditional power supply method of connecting numerous sockets and plug boards under a single terminal circuit breaker can no longer meet the requirements of safe power use and equipment protection. For example, the terminal circuit breakers used in 5G communication equipment not only urgently need to be upgraded and improved in terms of miniaturization, intelligence, reliability, stability, etc., but also many new matching structures have been expanded in terms of usage requirements. For example, it is required that the circuit breaker can be inserted and removed as conveniently as a plug. Such a new type of circuit breaker is called a plug-in circuit breaker, but it does not belong to the traditional plug-in, plug-and-play, drawer-type, or universal circuit breaker. The use of the new plug-in circuit breaker can not only provide various safety protection performances of the circuit breaker for the power line and electrical equipment, but also meet the needs of different electrical equipment for power quality, and enable the circuit breaker to be conveniently inserted / removed from the circuit in a plug-and-play manner. For this reason, the structures of plug-in circuit breakers have now developed in various forms. However, under the development trend of miniaturization of electrical equipment, the overall structure and operation mode of the matching circuit breaker still urgently need to be further improved, optimized, and upgraded.

[0003] Existing plug-in circuit breakers usually have a locking device to prevent the circuit breaker from being pulled out in the closed state and / or prevent the circuit breaker from closing during the insertion process. However, in the open state, a limiting mechanism is usually not provided to enable the circuit breaker to be inserted into the cabinet, which may cause the circuit breaker to fall out of the cabinet during transportation or other situations where vibrations occur.

[0004] Moreover, existing locking devices often cannot prevent incorrect brute-force insertion or brute-force extraction in the closed state. Additionally, mechanisms such as the locking device and the fixed unlocking device of existing plug-in circuit breakers generally lack designs to avoid the easy failure, poor reliability, and poor stability of the plugging and unplugging protection function caused by the structural factors of the insertion receptor. Furthermore, since the existing locking devices, fixed unlocking devices, etc. of plug-in circuit breakers have not realized the impact of the device structure they adopt on the selection of the insertion receptor, problems such as poor interchangeability, universality, and tolerance occur.

[0005] Furthermore, the existing plug-in circuit breaker locking device has many parts and components, a complex structure, and cumbersome functions. In addition, since the sheet metal structure of the installation cabinet has a certain elasticity, the circuit breaker can be violently installed into the installation cabinet even in the closed state, which poses a risk of live operation. This is mainly due to the lateral force (component force) of the plug-in and pull-out force on the circuit breaker. For example, based on mechanical analysis, it is not difficult to conclude that the plug-in and pull-out force artificially acting on the circuit breaker is the main force, which can be decomposed into a longitudinal force parallel to the plug-in and pull-out direction and a lateral force perpendicular to the plug-in and pull-out direction. During the plug-in and pull-out operation, if the internal force of the mechanism resisting the plug-in and pull-out (the force opposite to the longitudinal force of the plug-in and pull-out, such as friction, elastic force, etc.) is greater, the plug-in and pull-out force required is greater, that is, it is laborious; conversely, the plug-in and pull-out force required is smaller, that is, it is labor-saving, and the plug-in and pull-out operation is easy. However, if the lateral force (component force) of the plugging and unplugging force on the circuit breaker is large, if the force is borne by one part (or one point) of the circuit breaker, the stress concentration may easily lead to deformation of the insertion receptor, and the deformation is directly related to the adaptability of the circuit breaker. Therefore, the mechanism design should use as few structures of the lateral force (component force) as possible (preferably avoid), especially structures that can amplify the lateral force (such as cone wedges, inclined planes, levers), etc., but the prior art often does not realize this. Summary of the invention

[0006] The object of the present invention is to provide a plug-in circuit breaker which is simple in structure and safe and reliable.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A plug-in circuit breaker comprises a housing, a button mechanism and an operating mechanism, wherein the button mechanism drives the operating mechanism to execute closing / opening, the button mechanism has a closing position and an opening position corresponding to the closing / opening state of the circuit breaker, and the circuit breaker further comprises a linkage member and a locking member arranged in the housing, wherein the linkage member is provided with an abutment boss, and the locking member is provided with a locking boss; when the button mechanism is in the closing position, the abutment boss of the linkage member extends out of the housing, and is restricted by the button mechanism in the extended position and cannot be retracted into the housing; when the button mechanism is in the opening position, the linkage member retracts into the housing, the locking boss of the locking member extends out of the housing, and the locking boss of the locking member can be pushed back into the housing by a retracting external force.

[0009] Preferably, when the button mechanism is in the opening position, when the locking boss of the locking member retreats into the housing due to the retraction external force, the locking member cooperates with the button mechanism to prevent the button mechanism from switching from the opening position to the closing position.

[0010] Preferably, when the button mechanism is in the closing position, the locking boss of the locking member extends out of the housing and is limited by the button mechanism in the extended position and cannot be retracted into the housing.

[0011] Preferably, after the circuit breaker trips, the button mechanism can be pulled to move outward relative to the housing, and during the process of the button mechanism moving outward relative to the housing, the locking boss of the locking member retracts into the housing.

[0012] Preferably, during the process of the button mechanism moving outward relative to the housing, the button mechanism drives a linkage member, and the linkage member drives the locking member to unlock, causing the locking boss to retract into the housing.

[0013] Preferably, the linkage member is rotatably arranged on the housing. The linkage member includes an unlocking portion cooperating with the locking member and a linkage driving portion cooperating with the button mechanism. When the button mechanism moves outward relative to the housing, the linkage driving portion drives the linkage member to rotate, and the unlocking portion applies a force to the locking member to cause the locking boss of the locking member to retract into the housing.

[0014] Preferably, the button mechanism includes a button, a connecting rod, and a driving member. The button drives the driving member to act through the connecting rod. The driving member is rotatably arranged in the housing and is connected to the operating mechanism.

[0015] Preferably, when the button mechanism is in the closing position, the locking boss of the locking member extends out of the housing, and the outer side surface of the driving member abuts against the locking member, preventing the locking member from retracting into the housing. When the button mechanism is in the tripping position, the outer side surface of the driving member is misaligned with the locking member, releasing the abutting cooperation.

[0016] Preferably, the locking member includes an outward extension post, and the driving member includes a driving limiting portion cooperating with the outward extension post. When the button mechanism is in the tripping position, the driving limiting portion of the driving member faces the outward extension post of the locking member. When the locking boss of the locking member retracts into the housing, the outward extension post of the locking member is in limiting cooperation with the driving limiting portion, resisting the driving member from rotating in the closing direction and preventing the button mechanism from switching from the tripping position to the closing position.

[0017] Preferably, the locking member is installed in the housing through an elastic member. The elastic member is installed between the locking member and the housing, and the elastic member causes the locking boss of the locking member to extend out of the housing.

[0018] Preferably, the cross-section of the locking boss of the locking member is a right trapezoid or a right triangle. The locking boss includes a straight surface and an inclined surface. The straight surface faces the direction in which the circuit breaker is pulled out of the cabinet and is perpendicular to the installation and insertion direction of the circuit breaker, and the inclined surface faces the direction in which the circuit breaker is inserted into the cabinet.

[0019] Preferably, the linkage member includes a resisting boss and a driven boss. During the closing process, the button mechanism causes the resisting boss to extend out of the housing by pushing the driven boss, and the button mechanism abuts against the driven boss to prevent the resisting boss from retracting into the housing. During the tripping process, the button mechanism releases the abutting cooperation with the driven boss and makes way, and the resisting boss retracts into the housing.

[0020] Preferably, a limiting hole is provided on the housing, and the abutting boss of the linkage member and the locking boss of the locking member cooperate with the same limiting hole.

[0021] Preferably, the button mechanism includes a button, a connecting rod and a driving member, and the button drives the driving member to operate through the connecting rod. The driving member is rotatably arranged in the shell and connected to the operating mechanism. The button is provided with a first driving part that cooperates with the actuated boss. When the button mechanism is in the closing position, the button and the actuated boss abut against the first driving part. When the button mechanism is in the opening position, the first driving part of the button and the actuated boss are staggered and avoided.

[0022] Preferably, the interference boss is a square boss, and the interference boss includes a left contour surface and a right contour surface. When the interference boss is in the extended position, the left contour surface and the right contour surface are respectively perpendicular to the installation and insertion direction of the circuit breaker, the left contour surface prevents the circuit breaker from being pulled out of the cabinet in the direction in which the circuit breaker is pulled out of the cabinet, and the right contour surface prevents the circuit breaker from being inserted into the cabinet in the direction in which the circuit breaker is inserted into the cabinet.

[0023] Preferably, a limiting hole cooperating with the locking boss is provided on the shell, the locking piece is installed in the shell through a linear motion pair, and the direction of its linear motion is perpendicular to the installation and insertion direction of the circuit breaker, the locking piece is arranged between the button mechanism and the limiting hole, the locking piece is provided with a locking boss at the upper part near the limiting hole, and an outrigger column is provided at the lower part near the button mechanism, and a linkage step is provided on one side of the locking boss.

[0024] Preferably, a rotation center is provided in the middle of the linkage member, a resistance boss is provided on one side of one end, an unlocking part cooperating with the locking member is provided on the other side of the one end, and a linkage member driving part is provided at the other end. A driven boss is provided on the side close to the button mechanism between the rotation center and the resistance boss, and a driving part cooperating with the linkage member driving part is provided on the button mechanism. During the gate opening process, the button mechanism releases the resistance cooperation with the driven boss and gives way in the process of moving out of the shell, and the driving part on the button mechanism pulls the linkage member driving part to drive the linkage member to rotate, so that the resistance boss retreats back into the shell; when the button mechanism is in the gate opening position, the button mechanism can be pulled to move outside the shell, and the driving part continues to drive the linkage member to rotate during the process of the button mechanism continuing to move outside the shell, and the unlocking part applies a retracting external force to the locking member, and the locking member retreats to the shell.

[0025] The plug-in circuit breaker of the present invention includes a circuit breaker housing, a locking member, a linkage member, and a button mechanism installed inside the circuit breaker housing. When the button mechanism is in the closed position, the abutting boss of the linkage member is restricted by the button mechanism in the extended position and cannot retract to the retracted position, which can reliably prevent plugging and unplugging during closing, avoiding the risk of live operation. Moreover, when the circuit breaker is in the open state, the abutting boss of the linkage member retracts into the housing, and the locking boss of the locking member extends outside the housing, but it can be pushed back into the housing by an external retracting force when subjected to the retracting external force, that is, it does not prevent the circuit breaker from being inserted into the cabinet in the open state, and can also protect the circuit breaker from falling out of the cabinet due to vibration during transportation and other processes.

[0026] In addition, when the button mechanism is in the open position and the locking boss of the locking member retracts into the housing, the locking member resists the button mechanism, preventing the button mechanism from switching from the open position to the closed position, making the circuit breaker unable to close, so that the circuit breaker cannot close when it is not installed in the correct working position of the cabinet. Only when the circuit breaker is installed in the correct working position, the button mechanism can be normally opened and closed.

[0027] In addition, when the button mechanism is in the closed position, the locking member is restricted by the driving member in the extended position and cannot retract to the retracted position. As an auxiliary mechanism, together with the linkage member, it can reliably prevent the circuit breaker from being forcibly pulled out in the closed state. Due to the characteristic of not being able to retract to the retracted position provided by the structure, the ability of the circuit breaker product to resist abnormal brute force pulling out is effectively enhanced.

[0028] In addition, when the button mechanism is in the open position and the circuit breaker needs to be removed, the locking member is unlocked through the linkage member, so that the locking boss of the locking member retracts into the housing, and the circuit breaker can be safely pulled out from the installed cabinet. Description of the Drawings

[0029] Figure 1 is the overall structural schematic diagram of the plug-in circuit breaker of the present invention.

[0030] Figure 2 is Figure 1 the structural schematic diagram of the button mechanism, the linkage member, and the locking member in

[0031] Figure 3 is the partial enlarged schematic diagram of the linkage member, the handle, and the locking member of the present invention.

[0032] Figure 4 is the structural state schematic diagram of the anti-live insertion state during the installation process of the plug-in circuit breaker.

[0033] Figure 5 is the structural state schematic diagram of the anti-closing pull-out state of the plug-in circuit breaker.

[0034] Figure 6It is a partially enlarged schematic diagram of the linkage part, the locking part and the handle in the correctly installed and closed state.

[0035] Figure 7 It is a partially enlarged schematic diagram of the closing and opening indication of the button mechanism and the unlocking mechanism.

[0036] Figure 8 It is a partially enlarged schematic diagram of the closing and opening indication and the unlocking mechanism in the open state.

[0037] Figure 9 It is a partially enlarged schematic diagram of the closing and opening indication and the unlocking mechanism in the closed state.

[0038] Figure 10 It is an overall structural schematic diagram of the closing and opening indication and the unlocking mechanism in the state of being removed during opening.

[0039] Figure 11 It is a structural schematic diagram of the specific implementation manner of the linkage part and the housing of the present invention. Specific implementation manner

[0040] The following combines the Figures 1 to 11 Given embodiments are used to further illustrate the specific implementation manner of the plug-in circuit breaker of the present invention. The plug-in circuit breaker of the present invention is not limited to the description of the following embodiments.

[0041] As Figure 1 shown, the plug-in circuit breaker of the present invention includes a housing 6, a button mechanism, an operating mechanism 9 drivingly connected to the button mechanism, a moving contact 9a connected to the operating mechanism 9, a static contact 9b oppositely arranged to the moving contact 9a, and generally also includes (but is not limited to) a short-circuit protection mechanism 11, an arc extinguishing device 12, an overload protection mechanism 14, an outgoing line connection device 13, incoming line connection devices 1a, 1b and other components (not shown in the figure) possessed by a circuit breaker. The button mechanism drives the operating mechanism 9 to drive the moving contact to contact and close with the static contact, or drives the operating mechanism 9 to drive the moving contact to separate from the static contact to open. The button mechanism has a closing position and an opening position corresponding to the closing / open state of the circuit breaker.

[0042] As Figures 1 - 2 shown, a locking device is further provided inside the plug-in circuit breaker. A limit hole 61 cooperating with the locking device is provided on the housing 6, and a cabinet limit hole B0 is provided on the cabinet sheet metal part B of the receptor into which the plug-in circuit breaker is inserted. When the plug-in circuit breaker is installed in the working position, the limit hole 61 of the plug-in circuit breaker corresponds to the cabinet limit hole B0. When the plug-in circuit breaker is not installed in the working position, the limit hole 61 of the plug-in circuit breaker is misaligned with the cabinet limit hole B0, and the cabinet sheet metal part B will block the cabinet limit hole B0. This is the prior art in this field and will not be elaborated here.

[0043] As Figure 1 、4 -5, the plug-in circuit breaker of the present invention comprises a housing 6 provided with a limit hole 61, a button mechanism and an operating mechanism 9, the button mechanism drives the operating mechanism 9 to perform closing / opening, and the button mechanism has a closing position and an opening position corresponding to the closing / opening state of the circuit breaker. The button mechanism comprises a button 2, a connecting rod 7 and a driving member 5, the button 2 drives the driving member 5 to move through the connecting rod 7, the driving member 5 is rotatably arranged in the housing 6 and connected to the operating mechanism 9; when the button 2 is pressed, the button 2 drives the driving member 5 to rotate to one side through the connecting rod 7, the driving member 5 drives the operating mechanism 9 through the U-shaped rod 8 to drive the moving contact 9a to contact with the static contact 9b to realize closing, and when the button 2 is pulled out, the button 2 drives the driving member 5 to rotate to the other side through the connecting rod 7, the driving member 5 drives the operating mechanism 9 through the U-shaped rod 8 to drive the moving contact 9a to separate from the static contact to realize opening. The function of the driving member 5 is similar to the handle of a traditional small circuit breaker. The operating mechanism usually includes a contact support, a lock and a trip button connected to the moving contact 9a. The short-circuit protection mechanism 11 and the overload protection mechanism 14 are arranged corresponding to the lock of the operating mechanism. When a short circuit or overload occurs, they act on the lock to trip the operating mechanism and open the circuit breaker to achieve protection.

[0044] An improvement of the present invention is that the circuit breaker further includes a locking device, which includes a linkage member 3 and a locking member 4 arranged in the housing 6, wherein the linkage member 3 is provided with a resisting boss 31, and the locking member 4 is provided with a locking boss 41 arranged corresponding to the limiting hole 61; when the button mechanism is in the closing position, the resisting boss 31 of the linkage member 3 extends out of the housing 6, and is restricted by the button mechanism in the extended position and cannot be retracted into the housing; when the button mechanism is in the opening position, the linkage member 3 is retracted into the housing 6, and the locking boss 41 of the locking member 4 extends out of the limiting hole 61 of the housing 6, and after a retracting external force is applied to the locking member 4, the locking member 4 can be pushed back into the housing 6 by the retracting external force. In one embodiment, the resisting boss 31 of the linkage member 3 is arranged corresponding to the second limiting hole on the housing 6, and the second limiting hole and the limiting hole 61 are arranged side by side, and when the button mechanism is in the closing position, the resisting boss 31 extends out of the second limiting hole of the housing 6. As another preferred embodiment, the second limiting hole and the limiting hole 61 are the same limiting hole, and the abutting boss 31 and the locking boss 41 share the same limiting hole 61. In this embodiment, the abutting boss 31 and the locking boss 41 share the same limiting hole 61.

[0045] like Figure 4 , 11As shown, before installation, the circuit breaker is in the closed position. The linkage member 3 is driven by the first driving portion 20 of the button 2 to rotate counterclockwise. The abutting boss 31 of the linkage member 3 extends out of the limiting hole 61 of the housing 6 and is abutted and restricted by the first driving portion 20 of the button 2 in the extended position and cannot retract into the housing. At this time, when the circuit breaker is reinstalled into the cabinet, the right contour surface 31b of the abutting boss 31 abuts and cooperates with the transverse end surface B1 of the cabinet sheet metal part, and the circuit breaker cannot be installed in the working position, avoiding live operation and improving safety.

[0046] As Figure 5 shown, for the case where the circuit breaker is correctly installed and closed, the abutting boss 31 of the linkage member 3 extends out of the limiting hole 61 of the housing 6 and is abutted and restricted by the first driving portion 20 of the button 2 in the extended position and cannot retract into the housing. The left contour surface 31a of the abutting boss 31 abuts against a hole wall surface B2 of the cabinet limiting hole B0 of the cabinet sheet metal part. At this time, when the circuit breaker is pulled outwards, the circuit breaker cannot be pulled out from the working position, avoiding live operation and improving safety.

[0047] As Figure 1 、 6 shown, the locking member 4 is installed in the housing 6 through an elastic member. The locking member 4 is provided with a locking boss 41 arranged opposite to the limiting hole 61. The elastic member is installed between the locking member 4 and the housing 6. The locking member 4 has two working positions of extending and retracting. The elastic member makes the locking boss 41 of the locking member 4 extend out of the limiting hole 61. When the circuit breaker is tripped, after an external retracting force is applied to the locking member 4, the locking member 4 overcomes the biasing force of the elastic member to retract the locking boss 41 into the housing. By making the locking boss 41 of the locking member 4 extend out of the limiting hole during tripping, it can effectively prevent the circuit breaker from vibrating and falling out of the cabinet due to transportation and other reasons. At the same time, since an external retracting force applied to the locking member 4 can make the locking boss 41 retract into the housing, when the circuit breaker is inserted into the cabinet in the tripped state, the locking boss 41 of the locking member 4 retracts into the housing under the action of the extrusion external force applied by the cabinet sheet metal part, enabling the circuit breaker to be smoothly inserted into the cabinet. Preferably, the cross-section of the locking boss 41 of the locking member 4 extending out of the limiting hole 61 is a right trapezoid or a right triangle. The locking boss 41 includes a straight surface perpendicular to the side wall of the limiting hole 61 and an inclined surface. The straight surface faces the direction in which the circuit breaker is pulled out of the cabinet, and the inclined surface faces the direction in which the circuit breaker is inserted into the cabinet, making it easy for the circuit breaker to be inserted into the cabinet during tripping. The elastic member is a compression spring 10. Of course, the elastic member can also be other elastic members such as a torsion spring or a leaf spring.

[0048] Further preferably, as Figure 2As shown, when the button mechanism is in the off position, after an external indentation force is applied to the locking member 4 and the locking boss 41 of the locking member 4 retracts into the housing, the locking member 4 is in abutting cooperation with the button mechanism, preventing the button mechanism from switching from the off position to the on position, so that the plug-in circuit breaker cannot be closed during the installation process into the cabinet, and the button 2 cannot be pressed in place, thus avoiding live operation. As Figure 3 In the preferred embodiment shown, the locking member 4 further includes an extending post 42, and the driving member 5 includes a driving limiting portion 51 that cooperates with the extending post 42. In this embodiment, the driving limiting portion 51 is a step provided on the side wall of the driving member 5. Of course, it can also be a groove or a protrusion provided on the driving member 5. When the button mechanism is in the off position, the driving limiting portion 51 of the driving member 5 rotates to face the extending post 42 of the locking member 4. When the plug-in circuit breaker is inserted but not installed in the working position, the limiting hole 61 of the plug-in circuit breaker is misaligned with the cabinet limiting hole B0. Under the action of the extrusion external force applied by the cabinet sheet metal part, the locking boss 41 of the locking member 4 retracts into the housing, and the extending post 42 of the locking member 4 extends into the driving limiting portion 51 and is in limiting cooperation with the driving limiting portion 51, resisting the rotation of the driving member 5 in the closing direction, preventing the button mechanism from switching from the off position to the on position, so that the plug-in circuit breaker cannot be closed during the installation process into the installation position of the cabinet, avoiding live operation. In this embodiment, the locking member 4 is in abutting cooperation with the driving member 5 to prevent the button mechanism from switching from the off position to the on position, and its layout structure is more reasonable and occupies less space. Of course, the locking member 4 can also be in abutting cooperation with the button 2 or the connecting rod 7. For example, the button 2 cannot be pressed into the circuit breaker for closing by limiting with a boss or a card slot on the button 2; by abutting cooperation with a hook extending on the connecting rod 7, the connecting rod 7 cannot move in the closing direction.

[0049] Further preferably, as Figure 5As shown, when the button mechanism is in the closing position, the locking boss 41 of the locking member 4 extends out of the limit hole 61 of the housing 6 and is limited by the button mechanism in the extended position and cannot retract into the housing, so as to assist the linkage member 3 to prevent the circuit breaker from being inserted into and pulled out of the cabinet in the closed state (the locking member 4 plays an auxiliary role. Since the inclined surface 412 of the locking boss 41 of the locking member has a certain inclination angle with the outer surface of the circuit breaker, even if the locking boss 41 is always exposed outside, due to the certain elasticity of the cabinet sheet metal structure, it is still possible to forcibly push the circuit breaker in the closed state, causing potential safety hazards). In a preferred embodiment, the driving member 5 has an outer side surface 52. When the button mechanism is in the closing position, the locking boss 41 of the locking member 4 extends out of the housing 6, and the driving limit portion 51 of the driving member 5 turns away and is misaligned with the outer extension column 42, so that the outer side surface 52 of the driving member 5 rotates to a position where it abuts and cooperates with the outer extension column 42 of the locking member 4, making the locking member 4 unable to retract into the housing 6; when the button mechanism is in the opening position, the outer side surface 52 of the driving member 5 is misaligned with the locking member 4, releasing the abutting cooperation. At this time, the driving limit portion 51 of the driving member 5 turns to a position corresponding to the outer extension column 42.

[0050] Further preferably, after the circuit breaker is opened, the button mechanism can be pulled to move outward relative to the housing 6. During the process of the button mechanism moving outward relative to the housing 6, the locking boss 41 of the locking member 4 retracts into the housing 6. Preferably, during the process of the button mechanism moving outward relative to the housing 6, the button mechanism drives the linkage member 3, and the linkage member 3 drives the locking member 4 to unlock so that the locking boss 41 retracts into the housing 6. As Figure 3As shown, in a preferred embodiment of the locking member 4, the locking member 4 is mounted in the housing 6 through a linear motion pair, and the direction of its linear motion is perpendicular to the installation and insertion direction of the circuit breaker. The locking member 4 is arranged between the button mechanism and the limiting hole 61. A locking boss 41 is provided at the upper part of the locking member 4 close to the limiting hole 61, and an extension column 42 is provided at the lower part close to the button mechanism. A linkage step 43 for cooperating with the linkage member 3 is provided on one side of the locking boss 41. An elastic member is installed between the lower part of the locking member 4 and the housing 6. The elastic member causes the locking boss 41 of the locking member 4 to extend out of the limiting hole 61. After the circuit breaker is tripped, during the process of the button mechanism moving outward from the housing 6, the button mechanism drives the linkage member 3, and the linkage member 3 acts on the linkage step 43, and the locking member 4 overcomes the elastic force of the elastic member to retract the locking boss 41 into the housing 6. Obviously, the beneficial effects of this solution are as follows: First, since the locking member 4 moves linearly along a direction perpendicular to the installation and insertion direction A, it can effectively prevent or reduce the force deformation and / or micro-displacement of the locking member 4 and the cabinet sheet metal part of the insertion receptor. Second, since when the driving member 5 is in the closed position, the direction of the force exerted by the outer side surface 52 on the locking member 4 is basically parallel to its linear movement direction, it is difficult for human brute force to drive the locking member 4 back to the retracted position. Third, since the chute-slider pair can provide a great binding force in the direction perpendicular to its horizontal movement, the cooperation between the extension column 42 and the driving limiting part 51 can provide a great binding force against closing for the driving member 5, thereby effectively ensuring that the circuit breaker is not accidentally closed during the plugging and unplugging operation.

[0051] As Figure 1 , 6As shown, a preferred embodiment of the linkage member 3, the linkage member 3 is rotatably arranged on the shell 6, and is located between the button mechanism and the limiting hole 61. The linkage member 3 includes a contact boss 31 and an actuated boss 32. During the closing process, the button mechanism pushes the actuated boss 32 to make the contact boss 31 extend out of the limiting hole 61, and the button mechanism and the actuated boss 32 are actuated to prevent the contact boss 31 from returning to the shell 6. During the opening process, the button mechanism releases the actuated boss 32 and gives way, and the contact boss 31 returns to the shell. The button mechanism includes a button 2, a connecting rod 7 and a driving member 5. The button 2 drives the driving member 5 to move through the connecting rod 7. The driving member 5 is rotatably arranged in the housing 6 and connected to the operating mechanism 9. The button 2 is provided with a first driving part 20 that cooperates with the actuated boss 32. The button 2 is pressed to drive the operating mechanism to close the circuit breaker through the connecting rod 7 and the driving member 5. The first driving part 20 on the button 2 drives the linkage member 3 to rotate counterclockwise through the actuated boss 32, so that the abutting boss 31 extends out of the limiting hole 61. When the button mechanism is in the closed position, the button 2 and the actuated boss 32 abut against the longitudinal surface 20a of the first driving part 20 (meaning the surface arranged along the installation insertion direction A), so that the abutting boss 31 cannot be retreated into the housing 6, thereby preventing the plugging and unplugging of the circuit breaker in the closed state and avoiding live operation. The button 2 is pulled to drive the operating mechanism to open the gate through the connecting rod 7 and the driving member 5. When the button mechanism is in the open position, the first driving part 20 of the button 2 and the driven boss 32 are offset to avoid each other, so that the interference boss 31 is retracted into the housing. When the button mechanism is in the open position, the linkage member 3 can be driven by the button mechanism to rotate clockwise to retract the interference boss 31 into the housing. Of course, a spring can be set to make it rotate clockwise, or it can rely on the gravity of one end of the interference boss 31 to rotate clockwise.

[0052] Preferably, the linkage member 3 further includes an unlocking portion 34 that cooperates with the locking member 4 and a linkage driving portion 33 that cooperates with the button mechanism. After the circuit breaker is tripped, when the button mechanism moves out of the housing 6, the linkage driving portion 33 drives the linkage member 3 to rotate, and the unlocking portion 34 applies a force to the locking member 4 to cause the locking boss 41 of the locking member 4 to retract into the housing 6. Specifically, in a preferred embodiment of the linkage member 3, a rotation center is provided in the middle of the linkage member 3. One end is provided with a contact boss 31 on one side close to the limit hole 61, the other side of one end is provided with an unlocking portion 34 that cooperates with the locking member 4, and the other end is provided with a linkage driving portion 33 that bends toward the button mechanism. A driven boss 32 is provided on one side close to the button mechanism between the rotation center and the contact boss 31. A driving portion that cooperates with the linkage driving portion 33 is provided on the button mechanism. During the tripping process, when the button mechanism moves out of the housing 6, it releases the abutting cooperation with the driven boss 32 and makes way, and the driving portion on the button mechanism pulls the linkage driving portion 33 to drive the linkage member 3 to rotate, so that the contact boss 31 retracts into the housing; when the button mechanism is in the tripped position, the button mechanism can be pulled to move out of the housing 6. During the process of the button mechanism continuing to move out of the housing 6, the driving portion continues to drive the linkage member 3 to rotate, so that the unlocking portion 34 applies an indentation external force to the locking member 4, and the locking member 4 retracts into the housing 6.

[0053] In one embodiment, when the button mechanism is in the tripped position, pulling the button 2 drives the linkage member 3 to continue to rotate clockwise through the linkage driving portion 33, so that the unlocking portion 34 presses on the linkage step 43 of the locking member 4, causing the locking boss 41 of the locking member 4 to retract into the housing 6, so that the circuit breaker can be smoothly pulled out of the cabinet by pulling the button 2 after tripping. In one embodiment, the boss on the button 2 is used as the driving portion, and the bending portion is pulled during tripping to retract the contact boss 31 of the linkage member 3 into the housing. In another embodiment, a return spring can also be used to rotate the contact boss 31 of the linkage member 3 away from the limit hole 61. After the button mechanism releases the abutting cooperation with the driven boss 32 and makes way during tripping, the return spring causes the contact boss 31 of the linkage member 3 to retract into the housing.

[0054] As a preferred embodiment, the button 2 of the button mechanism includes a button member 21 and an indicating member 22. The indicating member 22 cooperates with the linkage member 3 to simultaneously achieve closing and opening indication, and can drive the locking boss 41 of the locking member 4 to retract into the housing 6 after opening. The indicating member 22 includes a rotating shaft 221, a display end face 223, and a driving boss 222 provided on the rotating shaft 221. The driving boss 222 is used as a driving portion to cooperate with the linkage driving portion 33 of the linkage member 3. An indicating portion for closing and opening identification is provided on the display end face 223, and corresponding color blocks or characters for closing and opening identification are provided on the indicating portion. A cavity-type mounting hole 211 is provided inside the button member 21, and an observation window 212 communicating with the mounting hole 211 is provided on the operating end face of the button member 21. The indicating member 22 is installed in the mounting hole 211 of the button member 21 through the rotating shaft 22 and can swing around the axis. This swing drives the indicating portion on the display end face 223 to move under the observation window 212, and the corresponding closing and opening states are displayed through the indicating portion moving into the observation window 212; when the circuit breaker is closed, the button 2 moves into the housing 6, and the driving boss 222 cooperates with the linkage driving portion 33 to rotate the indicating member 22, so that the area of the indicating portion on the display end face 223 corresponding to the closing state corresponds to the observation window 212; when the circuit breaker is opened, the button 2 moves out of the housing 6, and the driving boss 222 of the indicating member 22 cooperates with the linkage driving portion 33 of the linkage member 3. The indicating member 22 rotates to make the area of the indicating portion on the display end face 223 corresponding to the opening state correspond to the observation window 212 when indicating opening. At the same time, the driving boss 222 drives the linkage member 3 to rotate through the linkage driving portion 33 to make the abutting boss 31 retract into the housing, and at this time, the unlocking portion 34 of the linkage member 3 has not yet driven the locking member 4 to retract into the housing 6 (the unlocking portion 34 just contacts the linkage step 43 of the locking member 4 or there is a gap); after the circuit breaker is opened, when the button 2 is continuously pulled and the button 2 moves out of the housing 6, the driving boss 222 drives the linkage member 3 to rotate through the linkage driving portion 33, and the unlocking portion 34 applies a force to the locking member 4 to make the locking member 4 retract into the housing 6.

[0055] In this embodiment, when the circuit breaker is closed, the first driving portion 20 of the button 2 cooperates with the driven boss 32 of the linkage member to drive the abutting boss 31 of the linkage member to extend out of the housing 6. As another embodiment, it is also possible to drive the abutting boss 31 of the linkage member 3 to extend out of the housing 6 by the indicating member 22, that is, when the button 2 moves into the housing 6 to drive the circuit breaker to close (see Figure 9 ), the driving boss 222 of the indicating member 22 cooperates with the linkage driving portion 33 of the linkage member 3. When the indicating member 22 rotates to make the area of the indicating portion on the display end face 223 corresponding to the closing state correspond to the observation window 212 to indicate closing, at the same time, the linkage member 3 is rotated to make the abutting boss 31 of the linkage member 3 extend out of the housing 6.

[0056] Specifically, as shown in Figures 7 - 9As shown, the driving boss 222 is arranged on one side of the rotating shaft 221. The driving boss 222 extends outside the button 2 and cooperates with the linkage driving part 33. Of course, it can also be that the linkage driving part 33 is bent and extends into the button 2 to cooperate with the driving boss 222. In addition, the driving boss 222 may not be arranged on the rotating shaft 221. For example, it is arranged on one side of the connecting rod between the rotating shaft 221 and the display end face 223.

[0057] Preferably, a left receiving end 222b and a right receiving end 222a are arranged at intervals on the driving boss 222 of the indicating member 22. The linkage driving part 33 of the linkage member 3 is bent toward the button 2 and is located between the left receiving end 222b and the right receiving end 222a. When the button 2 is pressed to perform a closing operation toward the inside of the circuit breaker, the inclined surface of the left receiving end 222b is affected by the resistance of the linkage driving part 33 and rotates counterclockwise. At this time, the closing mark of the corresponding color of the indicating part on the display end face 223 can be displayed in the observation window 212. The on-off state is displayed by the color of the color block moved into the observation window 212. This solution has a simple structure and can be combined with a simplified unlocking structure. When the button 2 is pulled to perform a tripping operation, the right receiving end 222a of the indicating member acts on the right side surface of the linkage driving part 33 of the linkage 3. The linkage 3 is forced to rotate clockwise around the axis, so that the abutting boss 31 of the linkage 3 retracts into the shell body. The indicating member 22 rotates clockwise. At this time, the tripping mark of the corresponding color of the indicating part on the display end face 223 can be displayed in the observation window 212. At this time, the unlocking part 34 of the linkage 3 just touches or has a gap with the locking member 4, and the locking boss 41 of the locking member 4 remains protruding outside the shell body 6.

[0058] As Figure 8 As shown, in the tripping state, when it is necessary to remove the circuit breaker from the installation cabinet, the button mechanism is continuously pulled in a direction away from the circuit breaker. The right receiving end 222a of the indicating member acts on the right side surface of the linkage driving part 33 of the linkage 3. The linkage 3 is forced to rotate clockwise around the axis. The unlocking part 34 acts on the linkage part 43 of the locking member 4. The locking boss 41 slides back into the circuit breaker against the thrust of the spring 10. The locking between the locking boss 41 and the cabinet is released, and the circuit breaker can be removed from the working position. Its beneficial effects are as follows: First, the indication display is directly linked with the plugging and unplugging safety protection, so that a direct and fixed corresponding relationship is formed between the closing / opening display and the protruding position / retracting position of the locking boss 41 and the abutting boss 31, so that the operator can intuitively master the current safety state of the circuit breaker. Second, it provides the possibility for the abutting boss 31 and the locking boss 41 on the locking member 4 to protrude / retract from the same common limit hole 61, which can reduce the manufacturing difficulty of the insertion receptor, facilitate the interchangeability and universality between the circuit breaker product and the insertion receptor, and reduce the user's usage cost. Third, the structure is simple and the number of parts is small, which effectively supports the miniaturization and low-cost manufacturing of the circuit breaker product.

[0059] Preferably, the abutting boss 31 is a square boss, and the side surfaces on both sides of the square boss are perpendicular to the installation and insertion direction of the circuit breaker. The side surfaces on both sides of the abutting boss 31 are the left contour surface 31a and the right contour surface 31b. When the abutting boss 31 is in the extended position, the left contour surface 31a and the right contour surface 31b are respectively perpendicular to the side wall of the limiting hole 61, that is, perpendicular to the installation and insertion direction of the circuit breaker. The left contour surface 31a prevents the circuit breaker from being pulled out of the cabinet in the direction of pulling the circuit breaker out of the cabinet, and the right contour surface 31b prevents the circuit breaker from being inserted into the cabinet in the direction of inserting the circuit breaker into the cabinet. Among them, the right contour surface 31b abuts and cooperates with the transverse end surface B1 of the cabinet sheet metal part of the insertion receptor to prevent the insertion of the circuit breaker, and the left contour surface 31a abuts and cooperates with a hole wall surface B2 of the limiting hole B0 of the cabinet sheet metal part of the insertion receptor. The beneficial effects are as follows: it can effectively reduce the force deformation of the insertion receptor, effectively relax the adaptation tolerance of the insertion receptor, effectively facilitate the use and reduce the use cost. Preferably, the side of the driven boss 32 close to the button 2 is an inclined surface.

[0060] Specifically, as Figure 1 In the preferred embodiment of the plug-in circuit breaker of the present invention shown, the button mechanism includes a button 2, a connecting rod 7 and a driving member 5. The button 2 drives the driving member 5 to rotate through the connecting rod 7, and the driving member 5 drives the operating mechanism 9 to perform closing / opening through the connecting rod 8. The button mechanism and the driving member 5 respectively have a closing position and an opening position corresponding to the closing / opening of the circuit breaker, that is: in the closing state, the button mechanism and the driving member 5 respectively have a determined position (closing position), and in the opening state, the button mechanism and the driving member 5 respectively also have a determined position (opening position); this closing position / opening position corresponds to the closing / opening of the moving contact 9a and the static contact 9b.

[0061] A limiting hole 61 is provided on the housing 6. The locking member 4 is slidably arranged at a position corresponding to the driving member 5, between the driving member 5 and the limiting hole 61. The linkage member 3 is rotatably arranged between the button 2 and the limiting hole 61. The linkage member 3 is arranged on the left side of the locking member 4 and above the button mechanism.

[0062] A beneficial feature of the present invention is that when the button mechanism is in the closing position, the linkage member 3 is restricted by the button mechanism to the extended position and cannot retract to the retracted position. The beneficial effect of this structure is that it can reliably prevent closing and unplugging, that is, prevent the circuit breaker from being forcibly unplugged when it is in the closed state. Due to the feature of not being able to retract to the retracted position provided by this structure, the ability of the circuit breaker product to resist abnormal brute-force unplugging is effectively enhanced. When the button mechanism is in the opening position, there are various technical solutions for the position of the linkage member 3. One selectable solution is that the linkage member 3 is not restricted by the button mechanism and can be converted between the extended position and the retracted position, and its advantage is simple structure. Another selectable solution, which is also the preferred solution of the present invention, is that when the button mechanism is in the opening position, the linkage member 3 is restricted by the button mechanism and is in the retracted position, and its advantage lies in that it can directly avoid the linkage member 3 bringing resistance to the normal plugging and unplugging of the circuit breaker. Another advantage of the device of the present invention is that using the linkage member 3 as the unlocking member can simplify the structure of the unlocking mechanism, reduce the number of parts, and can realize the simultaneous retraction of the linkage member 3 and the driving locking member 4, so that the linkage member 3 and the driving locking member 4 do not generate any resistance to the normal plugging and unplugging of the circuit breaker.

[0063] Another beneficial feature of the present invention is that when the circuit breaker is in the opening state, the locking boss 41 of the locking member 4 extends outside the housing 6, but when it is subjected to a retracting external force (only a horizontal force will not cause the locking member 4 to retract, and a vertical component force in the retracting direction is required), it can be pushed back into the housing 6 by the retracting external force, that is, it does not prevent the circuit breaker from being inserted into the cabinet in the opening state, and can also protect the circuit breaker from falling out of the cabinet due to vibration during transportation and other processes. Another beneficial feature of the present invention is that when the button mechanism is in the opening position and the locking boss 41 of the locking member 4 retracts into the housing, the locking member 4 resists the driving member 5, making the driving member 5 unable to rotate, preventing the button mechanism from switching from the opening position to the closing position, and preventing the circuit breaker from closing. Another beneficial feature of the present invention is that when the button mechanism is in the closing position, the locking member 4 is restricted by the driving member 5 to the extended position and cannot retract to the retracted position. As an auxiliary mechanism, together with the linkage member 3, it can reliably prevent the circuit breaker from being forcibly pulled out when it is in the closed state. Due to the feature of not being able to retract to the retracted position provided by the structure, the ability of the circuit breaker product to resist abnormal brute-force pulling out is effectively enhanced.

[0064] The locking member 4 of the present invention has the following beneficial effects: First, since the locking member 4 moves linearly along a direction perpendicular to the installation and insertion direction A, it can effectively prevent or reduce the force-induced deformation and / or micro-displacement of the locking member 4 and the cabinet sheet metal part of the insertion receptor. Second, when the driving member 5 is in the closing position, the direction of the force exerted by the outer side surface 52 on the locking member 4 is substantially parallel to its linear movement direction, so it is difficult for human brute force to drive the locking member 4 back to the retracted position. Third, since the chute-slider pair can provide a great binding force in the direction perpendicular to the linear movement, the cooperation between the protruding column 42 and the step 51 can provide a great binding force against closing for the driving member 5, thereby effectively ensuring that the circuit breaker is not accidentally closed during the plugging and unplugging operation.

[0065] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. An insertion type circuit breaker, comprising a housing (6), a button mechanism and an operating mechanism (9), the button mechanism driving the operating mechanism (9) to perform closing / opening, the button mechanism having a closing position and an opening position corresponding to the closing / opening state of the circuit breaker, characterized in that: The circuit breaker further comprises a linkage member (3) and a locking member (4) arranged in the housing (6); the linkage member (3) is provided with an abutment boss (31), and the locking member (4) is provided with a locking boss (41); When the button mechanism is in the closing position, the abutment boss (31) of the linkage member (3) extends out of the housing (6) and is restricted by the button mechanism to the extended position and cannot be retracted into the housing; When the button mechanism is in the off position, the abutment boss (31) of the linkage member (3) retracts into the housing (6), the locking boss (41) of the locking member (4) extends out of the housing (6), and the locking boss (41) of the locking member (4) can be pushed back into the housing (6) by a retracting external force.

2. The plug-in circuit breaker according to claim 1, characterized in that: When the button mechanism is in the opening position, when the locking boss (41) of the locking member (4) is retracted into the housing (6) due to the retraction external force, the locking member (4) cooperates with the button mechanism to prevent the button mechanism from switching from the opening position to the closing position.

3. The plug-in circuit breaker according to claim 1, characterized in that: When the button mechanism is in the closing position, the locking boss (41) of the locking member (4) extends out of the housing and is limited by the button mechanism in the extended position and cannot be retracted into the housing.

4. The plug-in circuit breaker according to claim 1, characterized in that: After the circuit breaker is opened, the button mechanism can be pulled to move outside the housing (6), and during the movement of the button mechanism outside the housing (6), the locking boss (41) of the locking member (4) is retracted into the housing (6).

5. The plug-in circuit breaker according to claim 4, characterized in that: When the button mechanism moves toward the outside of the housing (6), the button mechanism drives the linkage member (3), and the linkage member (3) drives the locking member (4) to unlock so that the locking boss (41) returns to the inside of the housing (6).

6. The plug-in circuit breaker according to claim 5, wherein: The linkage member (3) is rotatably arranged on the housing (6), and the linkage member (3) comprises an unlocking portion (34) cooperating with the locking member (4) and a linkage member driving portion (33) cooperating with the button mechanism. When the button mechanism moves out of the housing (6), the linkage member (3) is driven to rotate by the linkage member driving portion (33), and the unlocking portion (34) applies force to the locking member (4) so that the locking boss (41) of the locking member (4) is retracted into the housing (6).

7. The plug-in circuit breaker according to claim 1, characterized in that: The button mechanism comprises a button (2), a connecting rod (7) and a driving member (5); the button (2) drives the driving member (5) to move via the connecting rod (7); the driving member (5) is rotatably arranged in a housing (6) and connected to an operating mechanism (9).

8. The plug-in circuit breaker according to claim 7, characterized in that: When the button mechanism is in the closing position, the locking boss (41) of the locking member (4) extends out of the housing (6), and the outer side surface (52) of the driving member (5) and the locking member (4) are in a resistive engagement so that the locking member (4) cannot be retracted into the housing (6); when the button mechanism is in the opening position, the outer side surface (52) of the driving member (5) and the locking member (4) are misaligned, and the resistive engagement is released.

9. The plug-in circuit breaker according to claim 7, wherein: The locking member (4) comprises an outrigger column (42), and the driving member (5) comprises a driving limiting portion (51) cooperating with the outrigger column (42); when the button mechanism is in the opening position, the driving limiting portion (51) of the driving member (5) faces the outrigger column (42) of the locking member (4); when the locking boss (41) of the locking member (4) is retracted into the housing (6), the outrigger column (42) of the locking member (4) and the driving limiting portion (51) are limitedly matched to resist the driving member (5) from rotating in the closing direction, thereby preventing the button mechanism from switching from the opening position to the closing position.

10. The plug-in circuit breaker according to claim 1, characterized in that: The locking member (4) is installed in the housing (6) via an elastic member, the elastic member is installed between the locking member (4) and the housing (6), and the elastic member enables the locking boss (41) of the locking member (4) to extend out of the housing.

11. The plug-in circuit breaker according to claim 10, characterized in that: The cross section of the locking boss (41) of the locking piece (4) is a right-angled trapezoid or a right-angled triangle. The locking boss (41) comprises a straight surface and an inclined surface. The straight surface faces the direction in which the circuit breaker is pulled out of the cabinet and is perpendicular to the installation and insertion direction of the circuit breaker. The inclined surface faces the direction in which the circuit breaker is inserted into the cabinet.

12. The plug-in circuit breaker according to claim 1, wherein: The linkage member (3) comprises a resisting boss (31) and an actuated boss (32). During the closing process, the button mechanism pushes the actuated boss (32) to cause the resisting boss (31) to extend out of the housing, and the button mechanism and the actuated boss (32) resist and cooperate to prevent the resisting boss (31) from returning to the housing (6). During the opening process, the button mechanism releases the resisting cooperation with the actuated boss (32) and gives way, and the resisting boss (31) returns to the housing.

13. The plug-in circuit breaker according to claim 1, characterized in that: The housing (6) is provided with a limiting hole (61), and the abutting boss (31) of the linkage member (3) and the locking boss (41) of the locking member (4) cooperate with the same limiting hole (61).

14. The plug-in circuit breaker according to claim 12, characterized in that: The button mechanism comprises a button (2), a connecting rod (7) and a driving member (5); the button (2) drives the driving member (5) to move via the connecting rod (7); the driving member (5) is rotatably arranged in a housing (6) and connected to an operating mechanism (9); a first driving portion (20) cooperating with an actuated boss (32) is arranged on the button (2); when the button mechanism is in a closing position, the button (2) and the actuated boss (32) abut against the first driving portion (20); when the button mechanism is in an opening position, the first driving portion (20) of the button (2) and the actuated boss (32) are offset and avoided.

15. The plug-in circuit breaker according to claim 12, characterized in that: The abutment boss (31) is a square boss, and comprises a left contour surface (31a) and a right contour surface (31b). When the abutment boss (31) is in an extended position, the left contour surface (31a) and the right contour surface (31b) are respectively perpendicular to the installation insertion direction of the circuit breaker, the left contour surface (31a) prevents the circuit breaker from being pulled out of the cabinet in the direction in which the circuit breaker is pulled out of the cabinet, and the right contour surface (31b) prevents the circuit breaker from being inserted into the cabinet in the direction in which the circuit breaker is inserted into the cabinet.

16. The plug-in circuit breaker according to claim 1, characterized in that: The housing (6) is provided with a limit hole (61) that cooperates with the locking boss (41). The locking member (4) is installed in the housing (6) through a linear motion pair, and the direction of its linear motion is perpendicular to the installation and insertion direction of the circuit breaker. The locking member (4) is arranged between the button mechanism and the limit hole (61). The upper part of the locking member (4) near the limit hole (61) is provided with a locking boss (41), and the lower part near the button mechanism is provided with an extension post (42). A linkage step (43) is arranged on one side of the locking boss (41).

17. The plug-in circuit breaker according to claim 12, characterized in that: The middle part of the linkage member (3) is provided with a rotation center. One side of one end is provided with a contact boss (31), the other side of one end is provided with an unlocking portion (34) that cooperates with the locking member (4), and the other end is provided with a linkage member driving portion (33). A driven boss (32) is arranged on the side near the button mechanism between the rotation center and the contact boss (31). A driving portion that cooperates with the linkage member driving portion (33) is arranged on the button mechanism. During the opening process, when the button mechanism moves outward from the housing (6), it releases the abutting cooperation with the driven boss (32) and makes way, and the driving portion on the button mechanism pulls the linkage member driving portion (33) to drive the linkage member (3) to rotate, so that the contact boss (31) retracts into the housing; when the button mechanism is in the opening position, the button mechanism can be pulled to move outward from the housing (6). During the process of the button mechanism continuing to move outward from the housing (6), the driving portion continues to drive the linkage member (3) to rotate, and the unlocking portion (34) applies an external force for retraction to the locking member (4), and the locking member (4) retracts to the housing (6).

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