CN211150472U - Tripping assembly and circuit breaker - Google Patents

Abstract

The utility model provides a tripping assembly and circuit breaker belongs to the electrical technology field. The dropout subassembly for carrying out the dropout operation to circuit breaker operating device's hasp, include: the tripper, with tripper complex armature, armature includes actuation portion, cooperation portion and counter weight portion are connected respectively in the relative both sides of actuation portion, cooperation portion and counter weight portion pass through the coaxial rotation of axis of rotation and connect in the casing of circuit breaker, cooperation portion is formed with the cooperation end that extends to the direction of keeping away from actuation portion, the cooperation end is used for cooperating with the hasp, counter weight portion is formed with the counter weight end that extends to the direction of keeping away from actuation portion, counter weight end and actuation portion do not are located the relative both sides of axis of rotation, the tripper corresponds the setting with actuation portion, be used for magnetism to inhale actuation portion, the axis of rotation is located the focus of armature. Through compacter dropout subassembly, make circuit breaker inner structure compacter, it is extravagant to reduce the space, reduces the hindrance that the normal transmission of dropout subassembly caused to circuit breaker operating device.

Description

Tripping assembly and circuit breaker

Technical Field

The utility model relates to an electrical technology field particularly, relates to a tripping assembly and circuit breaker.

Background

The circuit breaker is a device capable of closing, carrying, and breaking a current in a normal circuit or an abnormal circuit, and is widely used in the fields of power transmission, power distribution, and the like. The circuit breaker is usually realized by a tripping component arranged in the circuit breaker for breaking the current under the abnormal loop condition.

The tripping component generally comprises a tripper and an armature matched with the tripper, wherein the tripper generally comprises a thermomagnetic tripper, a hydromagnetic tripper and the like, one end of the tripper is provided with a magnetic attraction component capable of attracting the armature, the armature is rotatably arranged in a shell of the circuit breaker, when a loop accessed by the circuit breaker is abnormal, magnetic force generated by the tripper can attract one end of the armature to enable the armature to rotate, so that the other end of the armature can be matched with an operating mechanism of the circuit breaker (generally matched with a lock catch of the operating mechanism) to enable the lock catch of the operating mechanism of the circuit breaker to be tripped, and the operating mechanism drives a moving contact and a fixed contact to be disconnected under the restoring force of an elastic piece arranged on the operating mechanism to cut off loop current.

In order to avoid the armature rotating when it is subjected to a strong impact and causing a malfunction to the latch of the operating mechanism, which results in an accidental release of the latch, the center of rotation of the armature is usually located at the center of gravity of the armature. However, because one of the two ends of the armature is usually configured to have a relatively large structure in order to cooperate with the magnetic attraction component of the trip, the center of gravity (center of rotation) of the armature is relatively close to the end cooperating with the magnetic attraction component, and therefore, when the armature rotates under the action of magnetic force, the rotation stroke (swing amplitude of the end) of the end cooperating with the latch is relatively large, which results in that the whole space of the trip assembly in the circuit breaker occupies a relatively large amount.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a tripping assembly and circuit breaker can make circuit breaker inner structure compacter through the more compact tripping assembly of structure, reduces the space extravagant, reduces the hindrance that tripping assembly caused to the normal transmission of circuit breaker operating device.

The embodiment of the utility model is realized like this:

the utility model discloses an aspect provides a dropout subassembly for carry out the operation of threading off to circuit breaker operating device's hasp, include: the matching part and the counterweight part are coaxially and rotatably connected in the shell of the circuit breaker through rotating shafts, the matching part is provided with a matching end extending towards the direction far away from the attraction part, the matching end is used for being matched with a lock catch, the counterweight part is provided with a counterweight end extending towards the direction far away from the attraction part, the counterweight end and the attraction part are respectively positioned on two opposite sides of the rotating shaft, and the rotating shaft is positioned at the gravity center of the armature; the release is arranged corresponding to the suction part and is used for magnetically sucking the suction part.

Optionally, the attraction portion is a plate body, the counterweight portion and the matching portion are respectively connected to two opposite end faces of the plate body, and one face of the plate body faces the release.

Optionally, the plate surface of the plate body and the rotation axis are parallel to each other.

Optionally, the release includes an oil cup, a movable iron core, a reaction spring, a coil and a magnetic shoe, the coil is wound around the outer periphery of the oil cup, the movable iron core is slidably disposed in the oil cup, the sliding direction of the movable iron core is parallel to the central axis of the coil, the magnetic shoe is disposed at one end of the oil cup in the central axis direction of the coil, two ends of the reaction spring are respectively abutted to the movable iron core and the magnetic shoe, and the magnetic shoe is disposed opposite to the attraction portion.

Optionally, the matching portion is a strip-shaped member, one end of the strip-shaped member is connected with the suction portion and is rotatably connected with the rotating shaft, and the other end of the strip-shaped member is a matching end.

Optionally, the counterweight portion includes a connecting portion, the connecting portion is connected with the actuation portion and is rotationally connected with the axis of rotation, the counterweight end is formed on one side of the connecting portion away from the actuation portion, the counterweight end is of a flat plate structure, and the flat plate surface is perpendicular to the axis of rotation.

Optionally, the tripping assembly further comprises a torsion spring, the torsion spring is sleeved on the rotating shaft, and two acting ends of the torsion spring are respectively and correspondingly connected with the matching portion and the shell.

The utility model discloses another aspect of the embodiment provides a circuit breaker, include: the operating mechanism comprises an operating end which is connected through a connecting component in a transmission mode and used for operating and a driving end which is used for driving the moving contact, the fixed contact is arranged corresponding to the moving contact, the moving contact is connected with the driving end in a transmission mode and used for being in contact connection with the fixed contact after displacement, openings at two ends of the arc extinguish chamber respectively correspond to the fixed contact and the air outlet, the operating mechanism further comprises a lock catch used for locking the driving end, and a matching portion of an armature of the tripping component is matched with the lock catch of the operating mechanism.

Optionally, the lock catch is rotatably connected to the connecting member, and the center of rotation of the lock catch coincides with the center of gravity.

Optionally, the circuit breaker further includes a wiring assembly, and the moving contact and the fixed contact are electrically connected to the wiring assembly respectively.

The utility model discloses beneficial effect includes:

an embodiment of the utility model provides a pair of tripping assembly, including the release and with release matched with armature, wherein, armature includes actuation portion, cooperation portion and counter weight portion. The matching part and the counterweight part are respectively connected on two opposite sides of the suction part, and the counterweight part and the matching part are coaxially and rotatably connected in the shell of the circuit breaker through a rotating shaft. And the matching part is provided with a matching end extending towards the direction far away from the attraction part, the counterweight part is provided with a counterweight end extending towards the direction far away from the attraction part, and the counterweight end and the attraction part are respectively positioned at two opposite sides of the rotating shaft. Under the magnetic action of the tripper, the suction part moves towards the direction close to the tripper, so that the armature rotates, the matching end of the matching part moves towards the direction close to the lock catch, and the lock catch can be released through the matching between the matching end and the lock catch. Because this armature has counter weight portion, and counter weight portion is formed with the counter weight end of extending to keeping away from actuation portion, consequently make the holistic focus of armature can keep away from actuation portion relatively, when the axis of rotation sets up in the focus position, because the counter weight end is located axis of rotation and actuation portion relative one side, so be located the axis of rotation and keep away from the extension length of the cooperation end of actuation portion one side (be axis of rotation and actuation portion relative one side) can corresponding to reduce to some extent, when armature wholly rotates, the rotation stroke (be swing range) of cooperation end can correspondingly reduce, and then reduce the taking of armature rotation required space (the required and predetermined dodge space for armature rotates), make the whole compacter of tripping assembly, it is extravagant to reduce circuit breaker inner space, improve circuit breaker space utilization and be convenient for miniaturized design.

The embodiment of the utility model provides a pair of circuit breaker adopts foretell dropout subassembly, makes circuit breaker inner structure compacter, can reduce the space extravagant, reduces the hindrance that the normal transmission of dropout subassembly caused to circuit breaker operating device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a trip assembly according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an armature of a trip assembly according to an embodiment of the present invention;

fig. 3 is a second schematic structural diagram of the trip assembly according to the embodiment of the present invention;

fig. 4 is a schematic structural diagram of a circuit breaker according to an embodiment of the present invention.

Icon: 110-a release; 111-oil cup; 112-movable iron core; 113-reaction spring; 114-a coil; 115-magnetic shoes; 120-an armature; 121-a pull-in part; 122-a mating portion; 1220-a mating end; 123-a counterweight; 1230-counterweight end; 130-a rotating shaft; 140-torsion spring; 210-locking; 220-an operating mechanism; 230-moving contact; 240-arc extinguishing chamber; and (5) air outlet holes are formed in the bottom plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Generally, a circuit breaker is provided with an operating mechanism capable of driving a moving contact to rotate or move so as to control whether the moving contact is in contact with a fixed contact or not, the operating mechanism is generally provided with a lock catch to lock the transmission of the operating mechanism, and the moving contact and the fixed contact are prevented from being separated due to misoperation of the operating mechanism after the moving contact is in contact with the fixed contact. The operating mechanism is provided with a tripping component matched with the latch of the operating mechanism, so that when the circuit connected with the circuit breaker is abnormal (overload, short circuit and the like), the latch of the operating mechanism is controlled to trip, the operating mechanism automatically controls the moving contact and the static contact to break away under the action of the restoring force of the elastic piece, and the circuit is switched off.

An embodiment of the utility model provides a tripping assembly, as shown in fig. 1, include: the release 110 and the armature 120 engaged with the release 110, as shown in fig. 2, the armature 120 includes an attraction portion 121, an engagement portion 122 and a weight portion 123, the engagement portion 122 and the weight portion 123 are respectively connected to two opposite sides of the attraction portion 121, the engagement portion 122 and the weight portion 123 are coaxially and rotatably connected to a housing of the circuit breaker through a rotation axis 130, the engagement portion 122 is formed with a mating end 1220 extending in a direction away from the attraction portion 121, the mating end 1220 is used for engaging with the latch 210, the weight portion 123 is formed with a weight end 1230 extending in a direction away from the attraction portion 121, the weight end 1230 and the attraction portion 121 are respectively located at two opposite sides of the rotation axis 130, the release 110 and the attraction portion 121 are correspondingly disposed for magnetically attracting the attraction portion 121, wherein the rotation axis 130 is located at a center of gravity of the armature 120.

In practical applications, the armature 120 may be configured to have a structure in which the center of gravity coincides with the geometric center (i.e., a midpoint of a line connecting the engaging portion 121 and the engaging portion 1220), so that when the armature 120 rotates around the rotation axis 130 located at the center of gravity, a stroke of the engaging portion 121 and a stroke of the engaging portion 1220 may be equal to each other, thereby ensuring that swing amplitudes of the engaging portion 1220 and the engaging portion 121 are both reduced, and a space required for the armature 120 to rotate is relatively small.

The tripper 110 in the tripping assembly may be a common tripper 110 for circuit breakers, such as a hydro-magnetic tripper 110, a thermo-magnetic tripper 110, and the tripping assembly may also have different triggering conditions for tripping the latch 210 of the circuit breaker operating mechanism according to the difference of the tripper 110, for example, when the tripper 110 is the hydro-magnetic tripper 110, the magnitude of the magnetic field intensity generated by a coil connected to the loop by the hydro-magnetic tripper 110 may change along with the change of the loop current magnitude, so that when the loop is overloaded or shorted, the magnetic attraction of the attraction portion 121 of the armature 120 by a stronger magnetic field generated by the coil may be implemented, thereby triggering the tripping operation of the tripper on the latch 210 of the circuit breaker operating mechanism.

The matching between the matching end 1220 of the matching portion 122 of the armature 120 in the trip assembly and the latch 210 of the circuit breaker operating mechanism may be to strike the latch 210 or be in transmission connection with the latch 210, and the like, and herein, there is no specific limitation, and those skilled in the art may perform corresponding matching setting according to the specific setting of the latch 210 of the circuit breaker operating mechanism.

The embodiment of the utility model provides a tripping assembly, including release 110 and with release 110 matched with armature 120, wherein, armature 120 includes actuation portion 121, cooperation portion 122 and counter weight portion 123. The matching part 122 and the weight part 123 are respectively connected to two opposite sides of the attraction part 121, and the weight part 123 and the matching part 122 are coaxially and rotatably connected to the housing of the circuit breaker through the rotating shaft 130. The engaging portion 122 has a mating end 1220 extending in a direction away from the engaging portion 121, the weight portion 123 has a weight end 1230 extending in a direction away from the engaging portion 121, and the weight end 1230 and the engaging portion 121 are respectively disposed at two opposite sides of the rotating shaft 130. Under the magnetic force of the release 110, the attraction part 121 moves towards the direction close to the release 110, so that the armature 120 rotates, the mating end 1220 of the mating part 122 moves towards the direction close to the lock catch 210, and the lock catch 210 can be released through the mating between the mating end 1220 and the lock catch 210. Since the armature 120 has the weight portion 123, and the weight portion 123 is formed with the weight end 1230 extending away from the attraction portion 121, thus, the center of gravity of the armature 120 as a whole can be relatively distant from the attraction portion 121, and when the rotation shaft 130 is disposed at the center of gravity position, since the weighted end 1230 is located at the opposite side of the rotating shaft 130 from the attraction section 121, the extension length of the coupling end 1220 at a side of the rotation shaft 130 away from the attraction portion 121 (i.e. a side of the rotation shaft 130 opposite to the attraction portion 121) can be correspondingly reduced, as the armature 120 rotates as a whole, the rotational travel (i.e., amplitude of oscillation) of the mating end 1220 is correspondingly reduced, and then reduce the required space of armature 120 rotation (the required space of dodging of reserving for armature 120 rotates), make the whole compacter of trip component, it is extravagant to reduce circuit breaker inner space, improves circuit breaker space utilization and is convenient for miniaturized design.

Alternatively, as shown in fig. 2, the attraction portion 121 is a plate body, the weight portion 123 and the matching portion 122 are respectively connected to two opposite end surfaces of the plate body, and one surface of the plate body faces the trip unit 110.

The attraction part 121 is set as a plate body, and one plate surface of the plate body faces the release 110, so that the attraction part 121 has a better effect of receiving the magnetic attraction effect of the release 110, and the response of the attraction part is quicker. In practical application, the setting mode of the trip unit 110 may be adaptively set according to the direction of the panel surface of the attraction portion 121.

Alternatively, as shown in fig. 2, the plate surface of the plate body and the rotation shaft 130 are parallel to each other.

When the attraction portion 121 is set as a plate, the plate surface is set to be parallel to the rotating shaft 130, so that the attraction portion 121, which is the plate, can always keep the plate surface corresponding to the release 110 when being attracted by the magnetic force of the release 110 and moving, so that the release 110 can keep a good magnetic attraction effect on the attraction portion 121 of the armature 120 in the rotation process of the armature 120, and the stability of the release operation of the release assembly on the latch 210 of the operating mechanism is improved.

Optionally, as shown in fig. 3, the trip unit 110 includes an oil cup 111, a movable iron core 112, a reaction spring 113, a coil 114, and a magnetic shoe 115, the coil 114 is wound around an outer periphery of the oil cup 111, the movable iron core 112 is slidably disposed in the oil cup 111, a sliding direction of the movable iron core 112 is parallel to a central axis of the coil 114, the magnetic shoe 115 is disposed at one end of the oil cup 111 in the central axis direction of the coil 114, two ends of the reaction spring 113 are respectively abutted against the movable iron core 112 and the magnetic shoe 115, and the magnetic shoe 115 is disposed opposite to the attraction portion 121.

The trip 110 is configured as above, the coil 114 is connected in series to a circuit connected to the circuit breaker, when the current is greater than the threshold value, the magnetic field generated by the coil 114 makes the magnetic force between the movable iron core 112 and the magnetic shoe 115 greater than the elastic force generated by the counter spring 113, so that the movable iron core 112 moves toward the magnetic shoe 115, the magnetic force generated by the movable iron core 112 to the engaging portion 121 via the magnetic shoe 115 is gradually increased, and finally the engaging portion 121 approaches the magnetic shoe 115 under the action of the magnetic force to drive the armature 120 to rotate. The release 110 with this structure can release the latch 210 of the operating mechanism according to the current of the circuit connected to the circuit breaker, so as to protect the circuit from overload or short circuit.

The trip unit 110 with the above structure can also be provided with damping fluid in the oil cup 111 to damp the movement of the movable iron core 112.

Alternatively, as shown in fig. 2, the engaging portion 122 is a strip, one end of the strip is connected to the engaging portion 121 and rotatably connected to the rotating shaft 130, and the other end is an engaging end 1220.

The length direction of this bar is the extending direction of the mating end 1220 promptly, through setting up the mating portion 122 to the bar, can reduce the structure size in other directions beyond the extending direction of the mating end 1220, further reduces the space size that this armature 120 occupied, improves this tripping assembly's compactness.

Alternatively, as shown in fig. 1 and 2, the weight portion 123 includes a connecting portion, the connecting portion is connected to the attraction portion 121 and rotatably connected to the rotating shaft 130, the weight end 1230 is formed on a side of the connecting portion away from the attraction portion 121, the weight end 1230 is a flat plate structure, and a plate surface of the flat plate is perpendicular to the rotating shaft 130.

The counterweight end 1230 is set to be a flat plate structure, and the plate surface of the flat plate is perpendicular to the rotating shaft 130, so that when the armature 120 rotates, the operating mechanism of the circuit breaker is not easy to block the movement of the counterweight end 1230, and the counterweight end 1230 can be located on one side of the operating mechanism to save space and occupy, thereby improving the compactness of the overall structure of the final circuit breaker.

Optionally, as shown in fig. 1 and fig. 2, the trip assembly further includes a torsion spring 140, the torsion spring 140 is sleeved on the rotating shaft 130, and two acting ends of the torsion spring 140 are correspondingly connected to the matching portion 122 and the housing respectively.

In the embodiment of the present invention, two acting ends of the torsion spring 140 can be connected to the weight portion 123 and the housing respectively, as long as the torsion spring 140 can deform along with the rotation of the armature 120.

The torsion spring 140 is sleeved on the rotating shaft 130, and the armature 120 can automatically return to the original position after the release 110 releases the magnetic attraction by the restoring force provided by the torsion spring 140, so that the release assembly can be reused.

In another aspect of the embodiments of the present invention, there is provided a circuit breaker, as shown in fig. 4, including: the operating mechanism 220 comprises an operating end which is connected through a connecting component in a transmission mode and used for operating and a driving end which is used for driving the moving contact 230, the fixed contact is arranged corresponding to the moving contact 230, the moving contact 230 is connected with the driving end in a transmission mode and used for being in contact connection with the fixed contact after being displaced, openings at two ends of the arc extinguish chamber 240 respectively correspond to the fixed contact and the air outlet 250, the operating mechanism 220 further comprises a lock catch 210 used for locking the driving end, and a matching portion 122 of an armature 120 of the tripping assembly is matched with the lock catch 210 of the operating mechanism 220.

The circuit breaker adopts the tripping assembly, so that the internal structure of the circuit breaker is more compact, the space waste can be reduced, and the obstruction of the tripping assembly on the normal transmission of the circuit breaker operating mechanism 220 is reduced.

Optionally, the latch 210 is rotatably connected to the connecting assembly, and the center of rotation of the latch 210 coincides with the center of gravity.

In order to make the circuit breaker have better impact resistance, the rotation center of the latch 210 of the operating mechanism 220 can be arranged at the center of gravity of the latch 210, so that the latch 210 is not easy to rotate when the circuit breaker is impacted and vibrated, and the stability of the latch 210 when the operating mechanism 220 is locked is improved.

Optionally, the circuit breaker further includes a wiring assembly (not shown), and the movable contact 230 and the stationary contact are electrically connected to the wiring assembly respectively.

Through the wiring subassembly that is connected with moving contact 230 and static contact respectively, can make moving contact 230 and static contact more convenient be connected with the wire electricity to convenient insert the circuit breaker into with the electric circuit.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A trip assembly for tripping a latch of a circuit breaker operating mechanism, comprising: the armature comprises an attraction part, a matching part and a counterweight part, the matching part and the counterweight part are respectively connected to two opposite sides of the attraction part, the matching part and the counterweight part are coaxially and rotatably connected into a shell of the circuit breaker through rotating shafts, the matching part is provided with a matching end extending in the direction away from the attraction part, the matching end is used for matching with the lock catch, the counterweight part is provided with a counterweight end extending in the direction away from the attraction part, the counterweight end and the attraction part are respectively positioned on two opposite sides of the rotating shaft, and the rotating shaft is positioned at the gravity center of the armature; the release is arranged corresponding to the attraction part and is used for magnetically attracting the attraction part.

2. The trip assembly of claim 1, wherein the engaging portion is a plate, the counterweight portion and the engaging portion are connected to opposite ends of the plate, respectively, and a surface of the plate faces the trip unit.

3. The trip assembly of claim 2, wherein the plate surface of said plate body and said shaft are parallel to each other.

4. The trip assembly according to any one of claims 1 to 3, wherein the trip unit includes an oil cup, a movable iron core, a reaction spring, a coil and a magnetic shoe, the coil is wound around an outer periphery of the oil cup, the movable iron core is slidably disposed in the oil cup, a sliding direction of the movable iron core is parallel to a central axis of the coil, the magnetic shoe is disposed at one end of the oil cup in a direction of the central axis of the coil, two ends of the reaction spring are respectively abutted against the movable iron core and the magnetic shoe, and the magnetic shoe is disposed opposite to the attraction portion.

5. The trip assembly of claim 1, wherein said engagement portion is a strip having one end connected to said pull-in portion and rotatably connected to said shaft and another end being said engagement end.

6. The trip assembly of claim 1, wherein the counterweight portion includes a connecting portion connected to the attraction portion and rotatably connected to the rotation axis, the counterweight end is formed on a side of the connecting portion away from the attraction portion, the counterweight end is a flat plate structure, and a surface of the flat plate is perpendicular to the rotation axis.

7. The trip assembly according to claim 1, further comprising a torsion spring, wherein the torsion spring is sleeved on the rotating shaft, and two acting ends of the torsion spring are respectively connected with the matching portion and the housing.

8. A circuit breaker is characterized by comprising an operating mechanism, a moving contact, a fixed contact, an arc extinguish chamber, an air outlet and the tripping assembly as claimed in any one of claims 1 to 7, wherein the operating mechanism comprises an operating end which is connected in a transmission manner through a connecting assembly and is used for operating, and a driving end which is used for driving the moving contact, the fixed contact and the moving contact are correspondingly arranged, the moving contact and the driving end are in transmission connection and are in contact connection with the fixed contact after being used for displacement, openings at two ends of the arc extinguish chamber respectively correspond to the fixed contact and the air outlet, the operating mechanism further comprises a lock catch which is used for locking the driving end, and a matching part of an armature of the tripping assembly is matched with the lock catch of the operating mechanism.

9. The circuit breaker of claim 8, wherein the latch is pivotally coupled to the linkage assembly such that a center of rotation of the latch coincides with a center of gravity.

10. The circuit breaker of claim 8 or 9, further comprising a wiring assembly, wherein the movable contact and the stationary contact are electrically connected to the wiring assembly, respectively.

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