Mechanism assembly of plug-in circuit breaker

Abstract

The mechanism assembly of plug-in circuit breaker is characterized in that the mechanism assembly (3) comprises an operating member (3a) connected with a contact support member (3c) through a connecting rod (3b), the operating member (3a) can rotate in a housing (1), and the operating member (3a) can drive the movable contact (202) on the contact support member (3c) to contact or separate from the corresponding static contact (201) through the connecting rod (3b) during the rotation in the housing (1) to realize the on-off of the plug-in circuit breaker, and the contact support member (3c) is provided with a tripping execution mechanism (3f); the existing plug-in small circuit breaker mechanism module is redesigned, the connecting rod, the fixing buckle, the jump buckle and the lock buckle structure are improved to meet the performance requirements of the plug-in small circuit breaker, reduce the number of parts, reduce the product assembly difficulty, thereby reducing the product cost and improving the product assembly reliability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of low-voltage electrical technology, and particularly relates to a mechanism assembly of a plug-in circuit breaker. BACKGROUND

[0002] Circuit breakers are divided into plug-in, fixed and drawer types according to installation methods. The use of plug-in circuit breakers can effectively improve the safety of electrical equipment industry. With the wide use of plug-in circuit breakers in various electrical equipment, in order to meet the installation needs of various electrical equipment, the structure of plug-in circuit breakers has also developed into various types. In the layout of the installation position of the existing traditional plug-in circuit breaker product, the operation button is generally pressed down, the circuit breaker is closed, the operation button of the circuit breaker is returned to the reset position after the operation force is removed, and the circuit breaker is disconnected when the button is pressed again.

[0003] Chinese patent ZL201721400674.6 discloses a plug-in small circuit breaker, which comprises a shell, an outgoing line end, an incoming line end, a button mechanism, an operating mechanism, an overload protection mechanism, an arc extinguishing mechanism, a short-circuit protection mechanism and a signal end, characterized in that: the button mechanism is linked with a locking device and a fixed unlocking device. The plug-in small circuit breaker can directly insert the wiring and is simple and convenient to operate. At the same time, the locking mechanism is improved, so that the circuit breaker cannot be randomly closed outside the cabinet, and can be freely closed and opened inside the cabinet. The circuit breaker cannot be pulled out of the cabinet through parts other than the button, and can be easily taken out of the cabinet by pulling the button, thereby ensuring the safety of the circuit breaker installation and use. The circuit breaker is suitable for specific narrow spaces, and the internal structure of the circuit breaker is rearranged to solve the problem of excessive local temperature rise of the circuit breaker. However, the plug-in circuit breaker has a large number of parts, high product cost and complex assembly process, resulting in high rework rate in the assembly process and low product assembly efficiency. SUMMARY

[0004] The present application aims to solve the above-mentioned defects of the existing plug-in small circuit breaker, which has a large number of parts and a complex assembly process, and provides a mechanism assembly of a plug-in circuit breaker. The mechanism module of the existing plug-in small circuit breaker is redesigned, and the number of parts is reduced by improving the structure of the connecting rod, the fixing buckle, the jump buckle and the lock buckle, thereby reducing the product assembly difficulty, reducing the product cost and improving the reliability of the product assembly.

[0005] TECHNICAL SCHEME

[0006] In order to achieve the above technical purposes, the mechanism assembly of the plug-in circuit breaker provided by the application is characterized in that: the mechanism assembly comprises an operating member, the operating member is connected with a contact support member through a connecting rod, the operating member can rotate in a shell, and the operating member can drive the moving contact on the contact support member to contact or separate from the corresponding static contact to realize the on-off of the plug-in circuit breaker through the connecting rod during the rotation of the operating member in the shell; and a trip execution mechanism is arranged on the contact support member;

[0007] One end of the connecting rod connected with the operating member is further linked with a fixing buckle, the fixing buckle is arranged in the shell and can rotate, and during the rotation of the fixing buckle in the shell, a locking protrusion on the fixing buckle can extend out of or retreat into a gap on the shell.

[0008] Further, the trip execution mechanism comprises a jump buckle and a lock buckle, the jump buckle is rotatably arranged on the contact support member, one end of the connecting rod connected with the contact support member is further linked with the jump buckle, the lock buckle is rotatably arranged on the contact support member, and the lock buckle can lock and unlock the jump buckle, so as to realize the locking and unlocking of the movement of the connecting rod and the locking and unlocking of the mechanism assembly.

[0009] Further, during the movement of the contact support member driven by the connecting rod to drive the moving contact and the static contact to perform the opening and closing operation, the fixing buckle is not linked, and after the operating member is located at the opening position and continues to rotate counterclockwise, the fixing buckle can be driven to rotate counterclockwise by the connecting rod, so that the locking protrusion retreats into the gap on the shell.

[0010] The fixing buckle is connected with a reset spring, so that the fixing buckle has a clockwise rotation tendency and is reset.

[0011] Further, an operating member limiting protrusion is arranged on the outer side surface of the shell, so as to limit the clockwise rotation of the operating member after closing.

[0012] Further, a contact support member limiting protrusion is arranged in the shell, so as to limit the counterclockwise rotation of the contact support member after opening.

[0013] Further, the fixing buckle is arranged in the shell and rotates coaxially with the operating member.

[0014] Further, the operating member comprises an operating body, a rotating center hole one is arranged on the operating body, the operating body is installed on the shaft one in the shell through the rotating center hole one and can rotate around the shaft one, one end of the operating body is provided with a connecting rod mounting hole, one end of the connecting rod passes through the connecting rod mounting hole and extends into the linkage groove in the fixed buckle, the other end of the operating body is a handle end, the handle end can be driven to rotate the operating body around the shaft one to realize the on-off control of the switch device, a pulling feature is arranged on the handle end for pulling out the switch device from the switch installation cabinet.

[0015] Further, the pulling feature is a protrusion arranged on the handle end.

[0016] Further, the connecting rod mounting hole is a waist-shaped hole.

[0017] Further, a handle torsional spring is arranged on the operating body, the handle torsional spring is arranged in the handle torsional spring mounting groove on the operating body and can make the operating body have a clockwise rotation tendency.

[0018] Further, the fixed buckle comprises a fixed buckle body, a locking boss is arranged at the bottom of the fixed buckle body, the locking boss can extend out of the gap on the shell or retreat back during the rotation of the fixed buckle body, a spring mounting boss is arranged at the upper end of the fixed buckle body for hanging the reset spring, a linkage groove is arranged on the fixed buckle body for accommodating one end of the connecting rod passing through the connecting rod mounting hole, a position limiting boss is arranged at the upper end of the fixed buckle body for limiting the movement stroke of the connecting rod.

[0019] Further, a rotating center hole two is arranged on the fixed buckle body, the fixed buckle body is installed on the shaft two in the shell through the rotating center hole two and can rotate around the shaft two.

[0020] Further, the linkage groove is an arc table-shaped linkage groove.

[0021] Further, the contact support member comprises a contact support body, a rotating center hole three is arranged on the contact support body, the contact support body is installed on the shaft three in the shell through the rotating center hole three, a connecting rod groove is arranged on the contact support body, the other end of the connecting rod is arranged in the connecting rod groove through the linkage hole on the jump buckle, a movable contact mounting groove is arranged on the contact support body, a torsional spring is arranged on the contact support body and abuts against the movable contact to make the movable contact be arranged in the movable contact mounting groove, the movable contact and the static contact can rotate relative to the contact support body in the movable contact mounting groove under the action of the torsional spring force after the movable contact and the static contact contact.

[0022] Further, the torsion spring is sleeved on the torsion spring shaft of the contact support body, and one end of the torsion spring abuts against the movable contact.

[0023] Further, the jump buckle is rotatably sleeved on the convex shaft of the contact support, the lock buckle is rotatably sleeved on the contact support by means of a lock buckle shaft, the lock buckle comprises a linkage arm and a locking arm, the locking arm is provided with a step one, the jump buckle is provided with a step two corresponding to the step one, the step one and the step two are overlapped to form the locking of the lock buckle to the jump buckle, the linkage arm is rotated counterclockwise under the action of an external force to drive the locking arm to rotate counterclockwise, so that the step one is away from the step two to realize the unlocking of the jump buckle.

[0024] Further, the lock buckle is provided with a lock buckle reset torsion spring, so that the lock buckle has a clockwise rotation reset tendency.

[0025] Further, one end of the reset spring is hung on a spring mounting convex platform, and the other end is hung on a spring mounting convex column of the contact support body.

[0026] As preferred, the reset spring is a compression spring.

[0027] Advantages

[0028] The mechanism assembly of the plug-in circuit breaker provided by the application re-designs the existing plug-in small circuit breaker mechanism module, improves the structures of the connecting rod, the fixing buckle, the jump buckle and the lock buckle, meets the performance requirements of the plug-in small circuit breaker, reduces the number of parts, reduces the product assembly difficulty, thereby reduces the product cost and improves the product assembly reliability. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic view of the mechanism assembly in the open state in the embodiment of the application; Figure 1 Figure 2 is a schematic view of the mechanism assembly in the closed state in the embodiment of the application;

[0030] Figure 2 Figure 3 is a schematic view of the structure of the operating member in the embodiment of the application;

[0031] Figure 4 is a schematic view of the handle torsion spring installation structure in the embodiment of the application; Figure 3 Figure 5 is a schematic view of the structure of the fixing buckle in the embodiment of the application;

[0032] Figure 4 Figure 6 is a schematic view of the structure of the contact support in the embodiment of the application;

[0033] Figure 7 is a schematic view of the structure of the lock buckle in the embodiment of the application; Figure 5 Figure 8 is a schematic view of the structure of the lock buckle in the embodiment of the application;

[0034] Figure 6a Figure 9 is a schematic view of the structure of the lock buckle in the embodiment of the application;

[0035] Figure 10 is a schematic view of the structure of the lock buckle in the embodiment of the application; Figure 6b ​​​2 is a schematic structural diagram of a jump button in an embodiment of the present invention;

[0036] Attachment Figure 7 1 is a schematic structural diagram of a moving contact in an embodiment of the present invention;

[0037] Attachment Figure 8 Schematic diagram of the position of the limiting boss of the contact support member in an embodiment of the present invention;

[0038] Attachment Figure 9 Schematic diagram of the mechanism component in the closed state according to the embodiment of the present invention;

[0039] Attachment Figure 10 Schematic diagram of a mechanism component in a tripped state according to an embodiment of the present invention;

[0040] Attachment Figure 11 is a schematic diagram of a mechanism component in an unplugged state according to an embodiment of the present invention; DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] Example

[0043] As attached Figure 1 , 9, 10 and 11, the mechanism assembly of the pluggable circuit breaker provided in this embodiment includes a housing 1, a contact system 2, a mechanism assembly 3, the contact system 2 includes a moving contact 202 and a static contact 201, the mechanism assembly 3 includes an operating member 3a, the operating member 3a is connected to the contact support member 3c through a connecting rod 3b, and the operating member 3a can rotate in the housing 1, as shown in the attached Figure 8 As shown, the outer surface of the housing 1 is provided with an operating member limiting boss 1g to limit the operating member 3a from further clockwise rotation after closing. During the rotation of the operating member 3a within the housing 1, the connecting rod 3b can drive the movable contact 202 on the contact support member 3c to contact or separate with the corresponding static contact 201 to achieve the switching of the plug-in circuit breaker. The housing 1 is provided with a contact support limiting boss 1h to limit the contact support member 3c from further counterclockwise rotation after opening. The contact support member 3c is equipped with a trip actuator 3f;

[0044] The end of the connecting rod 3b connected with the operating member 3a is also linked with a fixing buckle 3d, the fixing buckle 3d is rotatable installed in the shell 1, in the embodiment, the fixing buckle 3d is coaxially rotatable installed in the shell 1 with the operating member 3a. In the rotating process of the fixing buckle 3d installed in the shell 1, the locking boss 3d01 on the fixing buckle 3d can be extended from or retreated into the gap 1a on the shell 1. The locking boss 3d01 on the fixing buckle 3d is extended from the gap 1a on the shell 1 and corresponds to the slot on the switch installation cabinet body to realize the locking installation of the switch device.

[0045] In the process of driving the contact support 3c to drive the moving contact 202 and the static contact 201 to operate the opening and closing of the switch device by the operating member 3a through the connecting rod 3b, the fixing buckle 3d is not linked, and the operating member 3a is located at the opening position and continues to rotate counterclockwise to drive the fixing buckle 3d to rotate counterclockwise through the connecting rod 3b to make the locking boss 3d01 retreat from the gap 1a on the shell 1.

[0046] The fixing buckle 3d is connected with a reset spring 3e to make the fixing buckle 3d have a clockwise rotating trend to reset. In the embodiment, the reset spring 3e is a compression spring. One end of the reset spring 3e is hung on the spring installation boss 3d0201, and the other end is hung on the spring installation column 3c0105 on the contact support body 3c01.

[0047] The tripping execution mechanism 3f includes a jump buckle 3f01 and a lock buckle 3f02, the jump buckle 3f01 is rotatably installed on the contact support 3c, the end of the connecting rod 3b connected with the contact support 3c also links the jump buckle 3f01, the lock buckle 3f02 is rotatably installed on the contact support 3c, and the lock buckle 3f02 can lock and unlock the jump buckle 3f01 to realize the locking and unlocking of the connecting rod 3b movement to realize the locking and unlocking of the mechanism assembly 3.

[0048] Further, as shown in the accompanying drawings Figure 1,2 and,3, the operating member 3a comprises an operating body 3a01, the operating body 3a01 is provided with a rotating center hole one 3a0101, the operating body 3a01 is installed on the shaft one 1b in the shell 1 through the rotating center hole one 3a0101 and can rotate around the shaft one 1b, one end of the operating body 3a01 is provided with a connecting rod mounting hole 3a0102, in the embodiment, the connecting rod mounting hole 3a0102 is a waist-shaped hole. One end of the connecting rod 3b passes through the connecting rod mounting hole 3a0102 and extends into the linkage groove 3d0202 in the fixed buckle 3d, the other end of the operating body 3a01 is a handle end 3a0103, the handle end 3a0103 is located at the operating end outside the shell 1, the handle end 3a0103 can be driven to rotate the operating body 3a01 around the shaft one 1b to realize the on-off control of the switch device, the handle end 3a0103 is provided with a pulling feature 3a0103a for pulling out the switch device from the switch installation cabinet. In the embodiment, the pulling feature 3a0103a is a protrusion provided on the handle end 3a0103. The operating body 3a01 is provided with a handle torsional spring 3a0104, the handle torsional spring 3a0104 is installed in the handle torsional spring mounting groove 3a0105 on the operating body 3a01 to make the operating body 3a01 have a clockwise rotation tendency.

[0049] As shown in the accompanying drawings Figure 1 and 4 As shown in the accompanying drawings, the fixed buckle 3d comprises a fixed buckle body 3d02, the fixed buckle body 3d02 is provided with a locking boss 3d01 at the bottom, the locking boss 3d01 can be extended from the gap 1a on the shell 1 or withdrawn during the rotation of the fixed buckle body 3d02, the upper end of the fixed buckle body 3d02 is provided with a spring mounting boss 3d0201 for hanging the reset spring 3e, the fixed buckle body 3d02 is provided with a linkage groove 3d0202 for accommodating one end of the connecting rod 3b passing through the connecting rod mounting hole 3a0102, in the embodiment, the linkage groove 3d0202 is an arc table-shaped linkage groove.

[0050] The upper end of the fixed buckle body 3d02 is provided with a position limiting boss 3d0203 for limiting the movement stroke of the connecting rod 3b. The fixed buckle body 3d02 is provided with a rotating center hole two 3d0204, the fixed buckle body 3d02 is installed on the shaft two 1c in the shell 1 through the rotating center hole two 3d0204 and can rotate around the shaft two 1c. The shaft two 1c and the shaft one 1b realize that the fixed buckle 3d is coaxially rotated with the operating member 3a in the shell 1.

[0051] As shown in the accompanying drawings Figure 15 and 7, the contact support member 3c includes a contact support body 3c01, the contact support body 3c01 is provided with a rotation center hole 3c02, the contact support body 3c01 is mounted on the shaft 3 1d in the housing 1 using the rotation center hole 3c02, the contact support body 3c01 is provided with a connecting rod groove 3c0101, the other end of the connecting rod 3b passes through the linkage hole 3f0101 on the jump buckle 3f01 Mounted within the connecting rod slot 3c0101. In this embodiment, the connecting rod slot 3c0101 is an arc-shaped slot. A movable contact mounting slot 3c0102 is mounted on the contact support body 3c01. A torsion spring 3c0103 is mounted on the contact support body 3c01, pressing against the movable contact 202, positioning the movable contact 202 within the movable contact mounting slot 3c0102. The contact end of the movable contact 202 extends out of the movable contact mounting slot 3c0102. After contact between the movable contact 202 and the stationary contact 201 is achieved, the force of the torsion spring 3c0103 allows the movable contact 202 to rotate relative to the contact support body 3c01 within the movable contact mounting slot 3c0102, under the action of the torsion spring 3c0103. In this embodiment, the torsion spring 3c0103 is mounted on a torsion spring shaft 3c0104 of the contact support body 3c01, with one end pressing against the movable contact 202.

[0052] As attached Figure 6a , 6b and 10, the jump buckle 3f01 is rotatably mounted on the convex shaft 3c03 on the contact support 3c, and the lock buckle 3f02 is rotatably mounted on the contact support 3c using the lock buckle shaft 3f0204. The lock buckle 3f02 is equipped with a lock buckle reset torsion spring 3f0203 to enable it to have a clockwise rotation reset tendency. In this embodiment, the lock buckle reset torsion spring 3f0203 is sleeved on the lock buckle shaft 3f0204. As shown in the attached Figure 6a As shown, the lock buckle 3f02 includes a linkage arm 3f0201 and a locking arm 3f0202, and the locking arm 3f0202 is provided with a step 3f0202a. Figure 6b As shown, the jump buckle 3f01 is provided with a step 2 3f01a corresponding to the step 1 3f0202a, and the overlap of the step 1 3f0202a and the step 2 3f01a forms the locking of the jump buckle 3f01 by the lock buckle 3f02. Under the action of external force, the linkage arm 3f0201 rotates counterclockwise, driving the locking arm 3f0202 to rotate counterclockwise so that the step 1 3f0202a moves away from the step 2 3f01a to unlock the jump buckle 3f01.

[0053] In this embodiment, the operating member moves clockwise to move the movable contact toward the attached Figure 9The closing state movement is shown. The rotating force of the operating member is transmitted to the contact support 3c through the connecting rod 3b, so that the movable contact 202 is closed with the static contact 201. After the movable contact 202 contacts the static contact 201, the mechanism assembly continues to move. At this time, the movable contact 202 will not move with the contact support 3c, but will rotate in the movable contact mounting groove 3c0102 around the two arc edges of the movable contact 202 abutting against the contact support 3c. The torsional spring 3c0103 provides the required contact pressure of the movable contact 202 at this time, and is used to apply a leftward force to the movable contact 202 to maintain the balance of the closing force. As shown in the accompanying drawings Figure 1 As shown, when the switch is opened, the contact support 3c relies on the restoring force of the reset spring 3e until the contact support 3c abuts against the limiting boss of the shell 1. At this time, it is the farthest point of opening of the contact system 4, and the movable contact 202 also returns to the initial position.

[0054] The product can realize the switching of opening and closing by operating the handle end upward or downward when opening and closing. When switching to the state that the switch product needs to be pulled out of the switch installation cabinet by the operating member, the pulling-out feature 3a0103a of the handle end can simultaneously serve as the force point of the hand, so that the hand applies a force to pull out the switch from the switch installation cabinet.

[0055] As shown in the accompanying drawings Figure 1 and 9 As shown in the accompanying drawings, the fixed buckle 3d has no any cooperative contact with the mechanism when the switch is in the opening and closing state. The connecting rod 3b stays at the upper end of the linkage groove 3d0202 when the operating member 3a drives the connecting rod 3b to stop when opening, and stays at the lower end when closing. When the fixed buckle 3d does not move, the reset spring 3e applies a force to the contact support 3c to move it in the opening direction. When the product needs to be pulled out, the operating member 3a is pushed to the opening position, and then a force is applied to move the operating member 3a counterclockwise. At this time, the connecting rod 3b driven by the operating member 3a stays at the upper part of the fixed buckle 3d, and the operating member 3a continues to move counterclockwise to drive the connecting rod 3b to move. At this time, the connecting rod 3b drives the fixed buckle 3d to move counterclockwise. At this time, the locking boss 3d01 rotates to the inside of the shell to release the locking function of the switch cabinet and the shell 1 as shown in the accompanying drawings Figure 11 At this time, the product can be pulled out by using the pulling-out feature 3a0103a of the handle end. Once the force on the operating member 3a is removed, the fixed buckle 3d will move clockwise to the gap 1a on the shell 1 under the action of the reset spring 3e.

[0056] When the switch is assembled into the switch installation cabinet, it needs to go through the stage where the fixing buckle 3d is pressed into the shell 1 by the cabinet. This stage is when the switch is not installed in place. The upper end of the fixing buckle body 3d02 is provided with a position limiting boss 3d0203 which cooperates with the connecting rod 3b to prevent the angle of the mechanism module transmission from reaching the dead point position, thereby ensuring that the product cannot be assembled in place and the product cannot be closed. The closing assembly of the product will be driven to the opening position by the fixing buckle 3d. Only after the switch is assembled in place can the locking boss 3d01 reach the notch position reserved in the cabinet, thereby extending out of the cabinet again to lock the switch device with the cabinet.

[0057] As attached Figure 9 As shown, when the circuit breaker is in the closed state, the overlap of the step 1 3f0202a and the step 2 3f01a forms the locking buckle 3f02 to lock the tripping buckle 3f01, and the entire mechanism assembly 3 is reliably in the closed state. When a short-circuit current occurs in the circuit breaker, the lock buckle 3f02 is driven by an external driving force to rotate counterclockwise, driving the locking arm 3f0202 to rotate counterclockwise so that the step 1 3f0202a moves away from the step 2 3f01a to unlock and trip the tripping buckle 3f01. Figure 10 After the external driving force disappears, the lock 3f02 will rotate clockwise and reset under the action of the lock reset torsion spring 3f0203.

[0058] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0059] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A mechanism assembly for a plug-in circuit breaker, characterized by: The mechanism assembly (3) comprises an operating member (3a), the operating member (3a) is connected with a contact support (3c) through a connecting rod (3b), the operating member (3a) can rotate in the shell (1), and the operating member (3a) can drive the movable contact (202) on the contact support (3c) to contact or separate from the corresponding static contact (201) through the connecting rod (3b) during rotation in the shell (1), so that the plug-in circuit breaker is turned on or turned off, and the contact support (3c) is provided with a tripping execution mechanism (3f); The connecting rod (3b) is further connected with a fixed buckle (3d) at one end of the operating member (3a), the fixed buckle (3d) is rotatably arranged in the shell (1), and during rotation of the fixed buckle (3d) in the shell (1), the locking boss (3d01) on the fixed buckle (3d) can be extended from or retreated into the gap (1a) on the shell (1); The tripping execution mechanism (3f) comprises a jump buckle (3f01) and a lock buckle (3f02), the jump buckle (3f01) is rotatably arranged on the contact support (3c), one end of the connecting rod (3b) is further connected with the jump buckle (3f01), and the lock buckle (3f02) is rotatably arranged on the contact support (3c); the lock buckle (3f02) can lock and unlock the jump buckle (3f01), so as to lock and unlock the movement of the connecting rod (3b) and realize the locking and unlocking of the mechanism assembly (3); The fixed buckle (3d) comprises a fixed buckle body (3d02), the bottom of the fixed buckle body (3d02) is provided with a locking boss (3d01), the locking boss (3d01) can be extended from or retreated into the gap (1a) on the shell (1) during rotation of the fixed buckle body (3d02), the upper end of the fixed buckle body (3d02) is provided with a spring mounting boss (3d0201) for hanging a reset spring (3e), the fixed buckle body (3d02) is provided with a linkage groove (3d0202) for accommodating one end of the connecting rod (3b) passing through the connecting rod mounting hole (3a0102), and the upper end of the fixed buckle body (3d02) is provided with a position limiting boss (3d0203) for limiting the movement stroke of the connecting rod (3b). The jump buckle (3f01) is rotatably installed on the convex shaft (3c03) of the contact support (3c), the lock buckle (3f02) is rotatably installed on the contact support (3c) by a lock buckle shaft (3f0204), the lock buckle (3f02) comprises a linkage arm (3f0201) and a locking arm (3f0202), the locking arm (3f0202) is provided with a first step (3f0202a), the jump buckle (3f01) is provided with a second step (3f01a) corresponding to the first step (3f0202a), the overlap of the first step (3f0202a) and the second step (3f01a) forms the locking of the lock buckle (3f02) to the jump buckle (3f01), the linkage arm (3f0201) is counterclockwise under the action of external force to drive the locking arm (3f0202) counterclockwise to make the first step (3f0202a) away from the second step (3f01a) to realize the unlocking of the jump buckle (3f01).

2. The plug-in circuit breaker mechanism assembly of claim 1, wherein: During the opening and closing operation of the movable contact (202) and the static contact (201) by the contact support (3c) driven by the connecting rod (3b), the fixed buckle (3d) is not linked, and the operation member (3a) is counterclockwise after the opening position to drive the fixed buckle (3d) counterclockwise by the connecting rod (3b) to make the locking boss (3d01) retreat from the gap (1a) on the shell (1); the fixed buckle (3d) is connected with the reset spring (3e) to make the fixed buckle (3d) have a clockwise rotation tendency to reset.

3. The plug-in circuit breaker mechanism assembly of claim 1, wherein: The outer side of the shell (1) is provided with an operation member limiting boss (1g) to limit the clockwise rotation of the operation member (3a) after closing.

4. The plug-in circuit breaker mechanism assembly of claim 1, wherein: The shell (1) is provided with a contact support limiting boss (1h) inside to limit the counterclockwise rotation of the contact support (3c) after opening.

5. The plug-in circuit breaker mechanism assembly of claim 1, wherein: The fixed buckle (3d) is installed in the shell (1) and rotates coaxially with the operation member (3a).

6. The plug-in circuit breaker mechanism assembly of claim 1, wherein: The operating member (3a) comprises an operating body (3a01) provided with a rotating center hole one (3a0101), the operating body (3a01) is installed on the shaft one (1b) in the shell (1) through the rotating center hole one (3a0101) and can rotate around the shaft one (1b), one end of the operating body (3a01) is provided with a connecting rod mounting hole (3a0102), one end of the connecting rod (3b) passes through the connecting rod mounting hole (3a0102) and extends into the linkage groove (3d0202) on the fixed buckle (3d), the other end of the operating body (3a01) is a handle end (3a0103), the handle end (3a0103) can be driven to rotate the operating body (3a01) around the shaft one (1b) to realize the on-off control of the switch device, the handle end (3a0103) is provided with a pulling feature (3a0103a) for pulling out the switch device from the switch installation cabinet.

7. The plug-in circuit breaker mechanism assembly of claim 6, wherein: The pulling feature (3a0103a) is a protrusion provided on the handle end (3a0103).

8. The plug-in circuit breaker mechanism assembly of claim 1, wherein: The connecting rod mounting hole (3a0102) is a waist-shaped hole.

9. The plug-in circuit breaker mechanism assembly of claim 6, wherein: The operating body (3a01) is provided with a handle torsional spring (3a0104), the handle torsional spring (3a0104) is installed in the handle torsional spring mounting groove (3a0105) on the operating body (3a01) to enable the operating body (3a01) to have a clockwise rotation tendency.

10. The plug-in circuit breaker mechanism assembly of claim 1, wherein: The fixed buckle body (3d02) is provided with a rotating center hole two (3d0204), the fixed buckle body (3d02) is installed on the shaft two (1c) in the shell (1) through the rotating center hole two (3d0204) and can rotate around the shaft two (1c).

11. The plug-in circuit breaker mechanism assembly of claim 1, wherein: The linkage groove (3d0202) is an arc table-shaped linkage groove.

12. The plug-in circuit breaker mechanism assembly of claim 1, wherein: The contact support (3c) comprises a contact support body (3c01) provided with a rotating center hole three (3c02), the contact support body (3c01) is installed on the shaft three (1d) in the shell (1) by using the rotating center hole three (3c02), the contact support body (3c01) is provided with a connecting rod groove (3c0101), the other end of the connecting rod (3b) passes through the linkage hole (3f0101) on the jump buckle (3f01) and is installed in the connecting rod groove (3c0101), the contact support body (3c01) is provided with a moving contact mounting groove (3c0102), a torsional spring (3c0103) is installed on the contact support body (3c0103) and abuts against a moving contact (202) to make the moving contact (202) be placed in the moving contact mounting groove (3c0102), the moving contact (202) and a static contact (201) can rotate relative to the contact support body (3c01) in the moving contact mounting groove (3c0102) under the action of the torsional spring (3c0103) after being contacted.

13. The plug-in circuit breaker mechanism assembly of claim 12, wherein: The torsion spring (3c0103) is sleeved on the torsion spring shaft (3c0104) of the contact support body (3c01) and one end abuts against the movable contact (202).

14. The plug-in circuit breaker mechanism assembly of claim 1, wherein: The lock catch (3f02) is provided with a lock catch reset torsion spring (3f0203) to make it have a clockwise rotation reset tendency.

15. The plug-in circuit breaker mechanism assembly of claim 2, wherein: One end of the reset spring (3e) is hung on the spring mounting boss (3d0201) and the other end is hung on the spring mounting boss (3c0105) on the contact support body (3c01).

16. The plug-in circuit breaker mechanism assembly of claims 2 or 15, wherein: The reset spring (3e) is a compression spring.

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