CN219626579U - Tripping mechanism and circuit breaker - Google Patents

Abstract

The utility model belongs to the technical field of low-voltage electrical appliances, and discloses a tripping mechanism and a circuit breaker. The circuit breaker includes casing, operating device, tripping device and arc extinguishing device, operating device sets up in the first end of casing, contact subassembly and tripping device all set up in the second end of casing, arc extinguishing device sets up in the casing and corresponds the setting with contact subassembly, and arc extinguishing device extends to the second end of casing by the first end of casing, has great installation space in making the casing so that arc extinguishing device extends to the second end of casing by the first end of casing, makes the circuit breaker have great explosion chamber in order to satisfy the high-pressure and divides the demand.

Description

Tripping mechanism and circuit breaker

Technical Field

The utility model relates to the technical field of piezoelectric devices, in particular to a tripping mechanism and a circuit breaker.

Background

With the continuous development of the power distribution technology, the performance requirements of a power distribution system on the circuit breaker are gradually improved, and the plastic shell circuit breaker product is promoted to continuously develop towards the small-size and high-performance directions. Currently, the main current of the piezoelectric device is still in the capacity range of three-level 1000VDC, and with the development of technologies in the industries of photovoltaic and the like, the voltage level of a molded case circuit breaker is continuously improved, and the voltage level already requires two-level or even single-level 1500VDC. The molded case circuit breaker comprises a tripping mechanism, wherein the tripping mechanism can control the molded case circuit breaker to break or close, and when the circuit breaker is short-circuited or severely overloaded, the tripping mechanism can be used for breaking.

The operating mechanism of the traditional molded case circuit breaker is limited by the external dimension of the product because of the design of a four-five connecting rod conversion structure, so that the size of an arc extinguishing chamber is small, and the high-voltage breaking is difficult to meet. And the tripping mechanism of the traditional molded case circuit breaker is complex, for example, the structure that the trip is realized by driving the shift lever to drive the lock catch through the reduction gear mechanism has low response speed, and the requirement of the molded case circuit breaker with high voltage level is difficult to meet.

Accordingly, a trip mechanism and a circuit breaker are needed to solve the above technical problems.

Disclosure of Invention

The utility model aims to provide a tripping mechanism which is high in response speed and suitable for breaking requirements of a breaker with a high voltage level.

To achieve the purpose, the utility model adopts the following technical scheme:

there is provided a trip mechanism applied to a circuit breaker, the trip mechanism comprising:

the traction rod is used for being rotationally connected with the shell of the circuit breaker;

the tripping rod is rotationally connected with the shell, and the operating mechanism of the circuit breaker can drive the tripping rod to rotate towards the traction rod so as to realize the clamping connection of the tripping rod and the traction rod;

the first elastic piece is connected with the trip bar, and the first elastic piece enables the trip bar to always have a trend of rotating back to the traction bar;

the second elastic piece is connected with the traction rod, and enables the traction rod to always have a trend of rotating towards the trip rod so that the traction rod is suitable for being clamped with the trip rod;

the tripping driving assembly is arranged corresponding to the traction rod and used for driving the traction rod to rotate back to the tripping rod so as to realize the separation and clamping connection of the traction rod and the tripping rod.

Optionally, the traction lever includes the first couple portion that can with the trip lever joint, be provided with spacing arch on the first couple portion, spacing arch can with the casing butt is in order to restrict the traction lever towards the rotation of trip lever.

Optionally, the trip drive assembly includes a bimetal for connection with a terminal block of the circuit breaker, the bimetal being deformable to push against the drawbar to rotate the drawbar relative to the housing and out of engagement with the trip bar.

Optionally, a first pushing part is arranged on the traction rod, a pushing piece is connected to the first pushing part, and the bimetal element can be deformed to push against the pushing piece.

Optionally, the bimetal element is provided with a plurality of and is connected with the wiring board in a one-to-one correspondence.

Optionally, the trip drive assembly includes:

a yoke for connecting with a wiring board of the circuit breaker;

the armature is arranged on the magnetic yoke, and the armature can rotate relative to the magnetic yoke so as to drive the traction rod to rotate relative to the shell, so that the traction rod is in clamping connection with the tripping rod.

Optionally, the trip drive assembly still include with the yoke rotates the driving medium of being connected, be provided with jack and bulldozing portion on the driving medium, be provided with the plug axle on the armature, the plug axle peg graft in the jack, the armature passes through the plug axle with the jack cooperation drives when driving the driving medium rotates, bulldozing portion can support the push away the traction lever so that the traction lever for the casing rotates and with the trip lever breaks away from the joint.

Optionally, the trip driving assembly includes a trip button, which is slidably connected with the housing, and the trip button can slide toward the traction rod and push the traction rod to rotate the traction rod relative to the housing and disengage from the trip rod.

Another object of the present utility model is to provide a circuit breaker with a large arc chute to meet the high voltage breaking demand.

Provided is a circuit breaker including:

a housing;

the operating mechanism is arranged at the first end of the shell;

the contact assembly is arranged at the second end of the shell;

the tripping mechanism is arranged at the second end of the shell;

the arc extinguishing device is arranged in the shell and corresponds to the contact assembly, and the arc extinguishing device extends from the first end of the shell to the second end of the shell.

Optionally, the contact assembly is provided in plurality, and the trip bar is located between two adjacent contact assemblies of the plurality of contact assemblies.

Optionally, the operating mechanism, the contact assembly and the trip mechanism are located on the same side of the arc extinguishing device.

The beneficial effects are that:

according to the tripping mechanism provided by the utility model, when the tripping driving assembly drives the traction rod to rotate back to the tripping rod and separate from the tripping rod, the first elastic piece drives the tripping rod to be far away from the position clamped with the traction rod, the corresponding speed is high, the tripping mechanism is suitable for the breaking requirement of a circuit breaker with a high voltage level, the condition that the tripping rod and the traction rod are not separated from the clamping connection can be effectively avoided, and the functionality is stable. In addition, under the effect of first elastic component and second elastic component, can make the joint cooperation between traction lever and the release lever stable.

According to the circuit breaker provided by the utility model, the operating mechanism is arranged at the first end of the shell, the contact assembly and the tripping mechanism are arranged at the second end of the shell, so that a larger installation space is formed in the shell, the arc extinguishing device extends from the first end of the shell to the second end of the shell, and the arc extinguishing device is provided with a larger arc extinguishing chamber to meet the high-voltage breaking requirement. In addition, because operating device sets up in the first end of casing, contact subassembly and tripping device set up in the second end of casing, operating device can effectively utilize the space in order to increase the opening between moving contact and the static contact, and then lengthen electric arc in order to make electric arc fully get into the explosion chamber.

Drawings

Fig. 1 is an exploded view of a circuit breaker according to a first embodiment of the present utility model;

FIG. 2 is an exploded view of an operating mechanism according to a first embodiment of the present utility model;

FIG. 3 is a schematic view of an operating mechanism in a brake-off state according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a part of an operating mechanism in a brake-off state according to an embodiment of the present utility model;

fig. 5 is a schematic view of a part of a structure of an operating mechanism in a closing state according to a first embodiment of the present utility model;

fig. 6 is a schematic view of a part of the structure of an operating mechanism in a tripped state according to the first embodiment of the utility model;

FIG. 7 is a schematic view of a floating link according to a first embodiment of the present utility model;

FIG. 8 is a schematic diagram illustrating a latch and a latch according to an embodiment of the present utility model;

fig. 9 is an exploded view of a part of the circuit breaker according to the first embodiment of the present utility model;

FIG. 10 is a schematic structural view of a bracket according to a first embodiment of the present utility model;

FIG. 11 is an exploded view of a contact assembly according to a first embodiment of the present utility model;

FIG. 12 is a schematic view of a latch and a rebuckle according to a first embodiment of the present utility model;

fig. 13 is a schematic view of a part of a circuit breaker according to a first embodiment of the present utility model;

FIG. 14 is a schematic view illustrating the mating of a trip assembly and a trip mechanism provided in accordance with a first embodiment of the present utility model;

fig. 15 is a schematic view of another part of the structure of a circuit breaker according to the first embodiment of the present utility model;

fig. 16 is a schematic view of a portion of a trip drive assembly according to a first embodiment of the present utility model;

FIG. 17 is an exploded view of a rocker arm according to a first embodiment of the present utility model;

fig. 18 is a schematic layout view of arc extinguishing bars according to a first embodiment of the present utility model;

fig. 19 is a schematic view of a part of the structure of a circuit breaker according to the second and third embodiments of the present utility model.

In the figure:

100. a housing; 101. a limit part; 110. an inner case;

210. a contact assembly; 211. a contact support; 2111. a contact rotating shaft; 2112. a boss; 212. a moving contact; 2121. an arc plate; 213. a contact elastic member; 214. a support shaft; 215. a conductive element; 220. a stationary contact; 230. a wiring board; 240. a fixed shaft;

300. arc extinguishing device; 310. a side panel assembly; 311. a gas generating member; 312. an insulating plate; 313. an insulating cover; 320. arc extinguishing grid plates; 330. an arc striking plate; 340. a ventilation plate;

400. a bracket; 410. a first chute; 420. a second chute; 430. a third chute;

500. A connecting rod assembly; 510. a first link; 520. a second link; 530. a third link; 540. a first rotating shaft; 550. a second rotating shaft;

600. a rocker arm assembly; 610. a rocker arm; 611. a deflector rod; 6111. a boss; 6112. pushing the bulge; 612. a rocker arm bracket; 6121. a positioning groove; 6122. a pushing shaft; 620. jumping buckle; 630. a jump buckle connecting rod; 631. a first trip portion; 632. a second trip portion; 633. a third trip portion; 640. a floating connecting rod; 641. a floating frame; 642. a first floating shaft; 643. a second floating shaft; 650. a first elastomer;

700. a linking component; 710. locking; 720. re-buckling; 721. positioning the bulge; 730. a second elastomer; 740. a third elastomer;

800. a trip mechanism; 810. a traction rod; 811. a first hook portion; 812. a limit protrusion; 813. a first pushing part; 814. a second pushing part; 815. a third pushing part; 820. a trip bar; 821. a second hook portion; 822. an operation unit; 8221. a positioning groove; 830. a first elastic member; 840. a second elastic member; 850. a trip drive assembly; 851. a bimetal element; 852. a yoke; 853. an armature; 8531. inserting a shaft; 854. a transmission member; 8541. a jack; 8542. a pressing part; 855. a trip button;

900. And a shunt release.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Example 1

Referring to fig. 1, the present embodiment provides a circuit breaker including a housing 100, and a contact assembly 210, a stationary contact 220, and an operating mechanism disposed within the housing 100. Wherein, the contact assembly 210 is driven to contact and separate from the stationary contact 220 by an operating mechanism to switch on and off the circuit breaker.

Specifically, the circuit breaker further includes an arc extinguishing device 300 disposed in the housing 100, the arc extinguishing device 300 being disposed corresponding to the contact assembly 210, the arc extinguishing device 300 being configured to eliminate a high voltage arc generated between the contact assembly 210 and the stationary contact 220.

In this embodiment, referring to fig. 2 to 6, the operating mechanism includes a bracket 400, a link assembly 500 and a rocker arm assembly 600, the link assembly 500 is connected to the moving contact assembly 210, and the rocker arm assembly 600 drives the moving contact assembly 210 to act through the link assembly 500.

Specifically, the support 400 is provided with a connecting rod assembly 500 and a rocker arm assembly 600, at least one sliding groove is formed in the support 400, the connecting rod assembly 500 comprises a plurality of connecting rods which are connected in turn in a rotating mode, the connecting rods are connected through rotating shafts, the rotating shafts are in one-to-one sliding connection with the sliding grooves, the connecting rods at the first end of the connecting rod assembly 500 are used for connecting the contact assemblies 210, and the connecting rods at the second end of the connecting rod assembly 500 are connected with the rocker arm assembly 600 in a rotating mode. Wherein, the plurality of connecting rods refers to a connecting rod comprising two or more than two.

In the embodiment, the operating mechanism is stable and reliable in transmission, so that the breaker meets the requirement of high-voltage breaking. Specifically, the link assembly 500 includes a plurality of links through which the swing arm assembly 600 is driven to achieve a large rotation angle of the contact assembly 210; and the connecting rods are all in sliding connection with the sliding grooves, and the connecting rods are guided to rotate through the sliding grooves, so that the connecting rod assembly 500 is stable and reliable in transmission, and high-voltage breaking is effectively met.

In the present embodiment, referring to fig. 3 to 6, the link assembly 500 includes a first link 510, a second link 520 and a third link 530 rotatably connected in sequence, the first link 510 and the third link 530 are rotatably connected in opposite directions, the first link 510 and the rocker arm assembly 600 are rotatably connected, and the third link 530 is used for rotatably connecting the contact assembly 210. In this embodiment, the structure of the link assembly 500 is compact by the reverse rotation of the first link 510 and the third link 530, so that the stability of the transmission of the link assembly 500 is effectively ensured, and the rotation angle of the contact assembly 210 is increased. In addition, the contact assembly 210 can be well separated from the rocker arm 610 by three connecting rods, so that the movable contact 212 has a large rotation angle.

Specifically, the connection line between the rotation center O1 between the first link 510 and the bracket 400 and the rotation center O2 between the third link 530 and the bracket 400 is always located on the same side of the rotation center O3 between the first link 510 and the second link 520, so as to prevent the first link 510 and the second link 520 from self-locking, and effectively ensure the usability of the operating mechanism.

In the present embodiment, referring to fig. 3 to 6, the rocker arm assembly 600 includes a rocker arm 610, a trip button 620, a trip button link 630, a floating link 640, and a first elastic body 650.

Specifically, the rocker arm 610 and the trip button 620 are both rotatably connected to the bracket 400, the trip button 620 and the floating link 640 are both rotatably connected to the trip button link 630, and the floating link 640 is rotatably connected to the first link 510; the first elastic body 650 is disposed between the rocker arm 610 and the floating link 640, and the first elastic body 650 keeps the trip button 620 having a tendency to move toward the rocker arm 610 through the floating link 640 and the trip button link 630. When the jump button 620 is fixed relative to the bracket 400, the rotation of the rocker arm 610 can make the first elastic body 650 drive the floating link 640 and the jump button link 630 to rotate reversely, so as to drive the link assembly 500 to drive the contact assembly 210 to act, so that the first link 510 rotates by a larger angle, which is beneficial to high-voltage breaking. Wherein the first elastic body 650 may include, but is not limited to, a spring.

In this embodiment, the rocker arm 610 has a closing position and a separating position relative to the bracket 400, and when the trip button 620 is relatively fixed to the bracket 400, the rocker arm 610 rotates from the separating position to the closing position to drive the connecting rod assembly 500 to drive the contact assembly 210 to contact the fixed contact 220 through the floating connecting rod 640 and the trip button connecting rod 630, and the rocker arm 610 rotates from the closing position to the separating position to drive the connecting rod assembly 500 to drive the contact assembly 210 to separate from the fixed contact 220 through the floating connecting rod 640 and the trip button connecting rod 630.

In addition, when the trip button 620 can freely rotate relative to the bracket 400, the first elastic body 650 makes the trip button 620 always have a tendency to move towards the rocker arm 610 through the floating link 640 and the trip button link 630, so as to reduce the linkage action amplitude of the floating link 640 and the link assembly 500, so that the rotation of the floating link 640 is insufficient to drive the contact assembly 210 to rotate to a position capable of generating an electric arc with the fixed contact 220 through the link assembly 500, and the circuit breaker can stably and safely control the action of the contact assembly 210.

In the present embodiment, referring to fig. 3 to 8, the floating link 640 includes a floating frame 641, a first floating shaft 642 and a second floating shaft 643, the first floating shaft 642 and the second floating shaft 643 are disposed on the floating frame 641, the first floating shaft 642 is connected to the first elastic body 650, the second floating shaft 643 is rotatably connected to the first link 510, and the second floating shaft 643 is disposed in parallel with the first floating shaft 642. Further, the trip link 630 includes a trip frame, a first trip portion 631 and a second trip portion 632 are disposed on the trip frame, the first trip portion 631 is rotationally connected to the trip 620, and the second trip portion 632 is rotationally connected to the first floating shaft 642. When the jump button 620 is fixed relative to the bracket 400, the rotation of the rocker arm 610 can make the first elastic body 650 drive the floating link 640 and the jump button link 630 to reversely rotate so as to make the second floating shaft 643 and the first jump button 631 separate from or approach each other. In the present embodiment, the first jump buckle portion 631 is fixed, that is, the first jump buckle portion 631 is used as a fulcrum, and the first floating shaft 642 between the first jump buckle portion 631 and the second floating shaft 643 is used for driving, so that the second floating shaft 643 has a larger movement range, and further the connecting rod assembly 500 is driven to have a larger movement range, so that the structure is compact, and meanwhile, a large rotation angle of the contact assembly 210 is realized.

In the present embodiment, as shown in fig. 3 to 8, the second floating shaft 643 acts rapidly, so as to effectively increase the speed of the connecting rod assembly 500 driving the contact assembly 210.

Specifically, the trip frame is further provided with a third trip portion 633, and the first trip portion 631, the second trip portion 632, and the third trip portion 633 are arranged in a triangle shape. It should be noted that, the rocker arm 610 further has a transition position relative to the bracket 400, the transition position is located between the closing position and the opening position, when the jump button 620 is relatively fixed to the bracket 400, and the rocker arm 610 is located at the transition position, a connecting line direction of a rotation center between the first floating shaft 642 and the second jump button 632 and a rotation center between the first jump button 631 and the jump button 620 coincides with an extending direction of the first elastic body 650.

Illustratively, when the trip button 620 is relatively fixed to the bracket 400 and the rocker arm 610 is initially located between the transition position and the opening position, the first floating shaft 642 abuts against the trip button 620, and the first elastic body 650 provides a force of the first floating shaft 642 against the trip button 620, so that the floating link 640 maintains a relatively stable position, and the contact assembly 210 does not act and maintains a separated state from the stationary contact 220. When the rocker arm 610 rotates towards the closing position to cross the transition position, the first elastic body 650 does not provide the force of the first floating shaft 642 against the trip 620, and under the action of the first elastic body 650, the first floating shaft 642 drives the trip connecting rod 630 to rotate, so that the second floating shaft 643 is rapidly far away from the first trip portion 631 while the third trip portion 633 of the trip connecting rod 630 is rapidly abutted against the trip 620, thereby ensuring that the connecting rod assembly 500 drives the contact assembly 210 to move at a speed.

Illustratively, when the trip 620 is relatively fixed to the bracket 400 and the rocker arm 610 is initially located between the transition position and the closing position, the third trip portion 633 abuts against the trip 620, and the first elastic body 650 provides a force of the third trip portion 633 against the trip 620, so that the floating link 640 maintains a relatively stable position, and the contact assembly 210 does not act and maintains a contact state with the stationary contact 220. When the rocker arm 610 rotates towards the opening position to cross the transition position, the first elastic body 650 does not provide the force of the third jump button 633 against the jump button 620, and under the action of the first elastic body 650, the first floating shaft 642 drives the jump button connecting rod 630 to rotate, so that the first floating shaft 642 rapidly abuts against the jump button 620, and simultaneously, the second floating shaft 643 rapidly approaches the first jump button 631, thereby ensuring that the connecting rod assembly 500 drives the contact assembly 210 to move at a speed.

In the present embodiment, referring to fig. 6 and 9, a limiting portion 101 is provided on the housing 100, and the limiting portion 101 is used to limit the position of the link assembly 500. In this embodiment, when the trip button 620 can freely rotate relative to the bracket 400, the first floating shaft 642 is always located at one side of the connecting line between the second floating shaft 643 and the first trip button portion 631 facing the opening position to prevent self-locking, and the first elastic body 650 makes the link assembly 500 always have a tendency to move towards the limiting portion 101 through the floating link 640, so that the link assembly 500 is effectively prevented from moving and transiting by abutting the link assembly 500 on the limiting portion 101, and the performance of the circuit breaker is affected.

In the present embodiment, when the rocker arm 610 is located at the closing position and the link assembly 500 abuts against the limiting portion 101, the trip button 620 can rotate freely relative to the bracket 400, and the contact assembly 210 is separated from the fixed contact 220, so that the circuit breaker is in a tripped state. In addition, two groups of connecting rod assemblies 500 are arranged on the bracket 400, and the connecting rod assemblies 500, the floating connecting rods 640 and the tripping connecting rods can be effectively prevented from being skewed through the limiting parts 101, so that the stability of the operating mechanism is affected.

It should be noted that, the included angle θ between the rotation center between the trip link 630 and the trip link 620, the rotation center between the third link 530 and the bracket 400, and the rotation center between the first link 510 and the bracket 400, which are sequentially connected, is between 5 ° and 60 °, so that the circuit breaker is ensured to be compact in structure, meanwhile, motion locking is effectively avoided between each transmission member between the trip link 620 and the third link 530, and a larger installation space is reserved for the arc extinguishing device 300.

In the present embodiment, referring to fig. 3 and 7 to 10, the first link 510 is rotatably connected to the floating link 640 through the second floating shaft 643, the first link 510 is rotatably connected to the second link 520 through the first rotating shaft 540, and the second link 520 is rotatably connected to the third link 530 through the second rotating shaft 550; further, the bracket 400 is provided with a first chute 410 slidably connected with the second floating shaft 643, a second chute 420 slidably connected with the first rotating shaft 540, and a third chute 430 slidably connected with the second rotating shaft 550, so as to effectively ensure the accuracy and stability of the motion of the connecting rod assembly 500. In the present embodiment, the limiting portion 101 is disposed corresponding to the first rotating shaft 540, and the first rotating shaft 540 abuts against the limiting portion 101 to realize the limiting function of the limiting portion 101 on the connecting rod assembly 500.

Specifically, a first end of the first link 510 is rotatably connected to the floating link 640 through a second floating shaft 643, a second end of the first link 510 is rotatably connected to a first end of the second link 520 through a first rotating shaft 540, and a second end of the second link 520 is rotatably connected to the third link 530 through a second rotating shaft 550. Wherein the middle region of the first link 510 is rotatably coupled to the bracket 400 by a shaft.

Specifically, the third link 530 includes a first rotating portion, a second rotating portion and a third rotating portion arranged in a triangle shape, the first rotating portion is rotationally connected with the bracket 400, the second rotating portion is rotationally connected with the second link 520, and the third rotating portion is rotationally connected with the contact assembly 210.

In this embodiment, referring to fig. 2 and 11, the contact assembly 210 includes a contact support 211, a moving contact 212 and a contact elastic member 213, the contact support 211 is rotationally connected with a connecting rod at a first end of the connecting rod assembly 500, the moving contact 212 is rotationally connected with the contact support 211, the contact elastic member 213 is disposed between the contact support 211 and the moving contact 212, the contact elastic member 213 can enable the moving contact 212 to always have a tendency to rotate towards the fixed contact 220, and the contact elastic member 213 effectively buffers the impact generated between the moving contact 212 and the fixed contact 220 while ensuring the stable contact between the moving contact 212 and the fixed contact 220. Wherein the contact spring 213 may include, but is not limited to, a torsion spring.

Specifically, a gas generating member 311 is disposed in the housing 100, an arc groove is disposed on the gas generating member 311, the moving contact 212 is connected with an arc plate 2121, and the arc plate 2121 is attached to the arc groove to realize rotational connection between the moving contact 212, the contact support 211 and the gas generating member 311. It should be noted that the rotation centers of the movable contact 212 and the contact support 211 coincide with the rotation centers of the third link 530 and the bracket 400, so as to ensure good transmission. In this embodiment, the cross section of the contact support is circular, and the rotation centers of the moving contact 212 and the contact support 211 coincide with the center of the contact support 211.

In this embodiment, referring to fig. 11, the contact assembly 210 further includes a support shaft 214 and a conductive element 215, where the support shaft 214 is penetrated by the contact support 211 and the moving contact 212 to realize rotational connection between the contact support 211 and the moving contact 212; both sides of the moving contact 212 are provided with fixing grooves, conductive elements 215 are fixed in the fixing grooves, and the conductive elements 215 are sleeved on the supporting shafts 214. The conductive element 215 can supplement abrasion in the motion of the moving contact 212, ensure the accurate motion of the moving contact 212 and prolong the service life of the circuit breaker.

Further, the movable contact 212 is connected to a wiring board 230, and is wired to an external device through the wiring board 230. Specifically, the wiring board 230 includes two opposite wiring arms, the movable contact 212 is disposed between the two wiring arms, and the movable contact 212 is in contact with the wiring arms through the conductive element 215 to achieve conduction between the movable contact 212 and the wiring board 230.

It should be noted that the contact assembly 210 is provided with a plurality of contact holders, the circuit breaker further includes a fixing shaft 240, and the fixing shaft 240 is penetrated through the plurality of contact holders 211 to realize the fixed connection between the plurality of contact holders 211, so as to ensure the consistency of rotation between the contact holders 211. In this embodiment, the rotation center between the contact support 211 and the bracket 400 is offset from the axis of the fixed shaft 240, and the contact support 211 is rotatably connected to the third link 530 through the fixed shaft 240, thereby improving the compactness of the operating mechanism.

In this embodiment, as shown in fig. 1 to 6, 8 and 12, the operating mechanism further includes a linking assembly 700 disposed on the bracket 400, where the linking assembly 700 is clamped with the trip buckle 620 to fix the trip buckle 620 to the bracket 400, so as to facilitate the tripping operation of the circuit breaker.

Specifically, the link assembly 700 includes a latch 710, a rebuckle 720, a second elastomer 730, and a third elastomer 740. Both the lock 710 and the rebuckles 720 are rotatably connected with the bracket 400; the second elastic body 730 is disposed between the latch 710 and the bracket 400, and the second elastic body 730 makes the latch 710 always have a tendency to rotate towards the jump button 620, so that the latch 710 is suitable for being clamped with the jump button 620; the third elastic body 740 is disposed between the rebuckles 720 and the bracket 400, and the third elastic body 740 makes the rebuckles 720 always have a tendency to rotate towards the lock catches 710, so that the rebuckles 720 are suitable for abutting against the lock catches 710; in this embodiment, the rocker arm 610 can press and drive the latch 620 to rotate towards the latch 710, so that the latch 620 is suitable for being engaged with the latch 710; when the jump button 620 is clamped with the lock catch 710, the rebuckles 720 are abutted with the lock catch 710, and the lock catch 710 is abutted with the lock catch 710 through the rebuckles 720, so that the lock catch 620 is clamped firmly, the jump button 620 is effectively prevented from being separated from the lock catch 710, and the fixation between the jump button 620 and the bracket 400 is realized. In addition, the rebuckles 720 rotate away from the lock catches 710, so that when the rebuckles 720 make room and are separated from the contact with the lock catches 710, the acting force of the first elastic body 650 is enough to enable the jump buckles 620 to rotate away from the lock catches 710 so as to be separated from the lock catches 710, thereby realizing free rotation of the jump buckles 620 relative to the bracket 400 and facilitating operation. The direction in which the latch 620 rotates toward the latch 710 is the N direction shown in fig. 6, the direction in which the latch 710 rotates toward the latch 620 is the M direction shown in fig. 6, and the direction in which the latch 720 rotates toward the latch 710 is the P direction shown in fig. 6.

In particular, the second elastic body 730 may include, but is not limited to, a torsion spring.

In particular, the third elastomer 740 may include, but is not limited to, a spring.

It should be noted that the connecting rod at the first end of the connecting rod assembly 500 is at least partially located on the side of the rebuckles 720 facing away from the trip buckles 620, i.e., the third connecting rod 530 is at least partially located on the side of the rebuckles 720 facing away from the trip buckles 620, so that the circuit breaker has enough space to install the arc extinguishing device 300. Preferably, the third link 530 is located entirely on the side of the rebuckles 720 facing away from the jump buttons 620.

In this embodiment, referring to fig. 1 and fig. 13 to fig. 15, the circuit breaker further includes a trip mechanism 800 disposed in the housing 100, and the trip mechanism 800 enables the linking assembly 700 to be adapted to be engaged with the trip 620 and enables the linking assembly 700 to be disengaged from the trip 620.

Specifically, the operating mechanism is disposed at a first end of the housing 100, the contact assembly 210 and the trip assembly are both disposed at a second end of the housing 100, and the arc extinguishing device 300 extends from the first end of the housing 100 to the second end of the housing 100. The first end and the second end of the housing 100 are opposite ends of the housing 100 in the direction a in fig. 1. In this embodiment, since the operating mechanism is disposed at the first end of the housing 100, the contact assembly 210 and the trip mechanism 800 are disposed at the second end of the housing 100, so that a larger installation space is provided in the housing 100 to extend the arc extinguishing device 300 from the first end of the housing 100 to the second end of the housing 100, so that the circuit breaker has a larger arc extinguishing chamber to meet the high voltage breaking requirement. In addition, since the operating mechanism is disposed at the first end of the housing 100, the contact assembly 210 and the trip mechanism 800 are disposed at the second end of the housing 100, the operating mechanism can effectively use space to increase the gap between the moving contact 212 and the fixed contact 220, and further elongate the arc so that the arc fully enters the arc extinguishing chamber. Wherein the arc extinguishing device 300 is disposed below the operation device.

Specifically, the trip mechanism 800 includes a traction lever 810 and a trip lever 820, wherein the rocker arm 610 rotates from a tripped state to a release position to push the trip lever 820 against the traction lever 810 to engage with the traction lever 810.

In this embodiment, when the rocker arm 610 rotates from the tripped state to the brake release position to push against the trip lever 820, the rocker arm 610 can push against to drive the trip button 620 to rotate towards the link assembly 700 so as to clamp the trip button 620 and the link assembly 700, thereby facilitating the fixation between the trip button 620 and the bracket 400. Specifically, the rocker arm 610 pushes the trip lever 820 to make the trip lever 820 leave the space required for the rebuckles 720 to rotate, and under the action of the third elastic body 740, the rebuckles 720 rotate towards the lock catches 710 and are abutted against the lock catches 710, so that the lock catches 710 are clamped firmly with the jump buckles 620.

In this embodiment, when the trip bar 820 is disengaged from the traction bar 810, the trip bar 820 can drive the link assembly 700 to disengage from the trip 620, so as to facilitate the tripping operation of the circuit breaker. Specifically, the trip lever 820 drives the rebuckles 720 to rotate and separate from the lock catches 710, so as to separate the lock catches 710 from the jump buckles 620.

Specifically, the contact assembly 210 is located between the rocker arm assembly 600 of the operating mechanism and the traction lever 810 of the trip mechanism 800, further increasing the separation between the moving contact 212 and the stationary contact 220.

Specifically, the operating mechanism, the contact assembly 210, and the trip mechanism 800 are located at the same side of the arc extinguishing device 300, so that the arc extinguishing device 300 has a large installation space.

Specifically, both the traction bar 810 and the trip bar 820 are rotatably coupled to the housing 100. Of course. The traction bar 810 and trip bar 820 may also be coupled to the housing 100 by other means, not otherwise limited herein.

Specifically, the trip bar 820 is located between two adjacent contact assemblies 210 of the plurality of contact assemblies 210, so as to prevent the trip bar 820 from occupying the installation space of the operating mechanism, thereby improving the compactness of the operating mechanism, effectively reducing the volume of the circuit breaker, and increasing the installation space of the arc extinguishing device 300.

It should be noted that, the trip operation of the circuit breaker can be realized through one traction rod 810 and trip rod 820, so that the circuit breaker can be compact in structure and meanwhile, the quick trip of the circuit breaker can be realized.

In this embodiment, referring to fig. 14, the trip mechanism 800 further includes a first elastic member 830, a second elastic member 840, and a trip driving assembly 850. Specifically, the first elastic member 830 is connected to the trip lever 820, and the first elastic member 830 makes the trip lever 820 always have a tendency to rotate away from the traction lever 810; the second elastic member 840 is connected to the pull rod 810, and the second elastic member 840 enables the pull rod 810 to always rotate towards the trip rod 820 so that the pull rod 810 is suitable for being clamped with the trip rod 820; the trip driving assembly 850 is disposed corresponding to the traction rod 810, and the trip driving assembly 850 is configured to drive the traction rod 810 to rotate away from the trip rod 820, so as to disengage the traction rod 810 from the trip rod 820. Wherein, the first elastic member 830 is disposed between the trip bar 820 and the housing 100, and the second elastic member 840 is disposed between the traction bar 810 and the housing 100. In this embodiment, under the action of the first elastic member 830 and the second elastic member 840, the clamping fit between the traction rod 810 and the trip rod 820 is stable, and when the trip driving assembly 850 drives the traction rod 810 to rotate back to the trip rod 820 and separate from the trip rod 820, the first elastic member 830 drives the trip rod 820 to be away from the position clamped with the traction rod 810, so that the corresponding speed is high, the circuit breaker is suitable for the breaking requirement of a circuit breaker with a high voltage level, and the condition that the trip rod 820 and the traction rod 810 are not separated from each other can be effectively avoided, and the functionality is stable.

Specifically, the first elastic member 830 and the second elastic member 840 may each include, but are not limited to, a spring.

Specifically, the traction lever 810 includes a first hooking portion 811 capable of being hooked with the trip lever 820, and the trip lever 820 includes a second hooking portion 821 capable of being hooked with the first hooking portion 811. In this embodiment, in the process of moving the second hook portion 821 towards the first hook portion 811, the second hook portion 821 pushes the first hook portion 811 to enable the traction lever 810 to rotate back to the trip lever 820, so as to form a yielding position, until the second hook portion 821 is suitable for being clamped with the first hook portion 811, and the traction lever 810 drives the first clamping portion to move towards the second clamping portion and to be clamped with the second clamping portion under the action of the second elastic member 840.

Specifically, the trip lever 820 further includes an operating portion 822, and the rocker arm 610 can push against the operating portion 822 to achieve a clamping engagement between the trip lever 820 and the traction lever 810. Further, the operation portion 822 is provided with a positioning groove 8221, and the rebuckles 720 are provided with positioning protrusions 721, when the rocker arm 610 pushes against the operation portion 822 to realize the clamping connection between the trip lever 820 and the traction lever 810, the positioning groove 8221 is away from the positioning protrusions 721 and keeps a certain gap, so that the condition that the interlocking component 700 is separated from the jumping buckle 620 is prevented; when the trip lever 820 is disengaged from the traction lever 810, the trip lever 820 approaches to the link assembly 700 under the action of the first elastic member 830 until the positioning protrusion 721 is placed in the positioning groove 8221, the trip lever 820 pushes the link assembly 700 away from the trip button 620, so as to implement quick trip, which can be understood that in the process that the positioning protrusion 721 is placed in the positioning groove 8221, the trip lever 820 impacts the rebuckles 720, so that the rebuckles 720 are quickly separated from the lock catch 710.

Further, the first hook portion 811 is provided with a limiting protrusion 812, and the limiting protrusion 812 can be abutted with the housing 100 to limit the rotation of the pull rod 810 towards the trip rod 820, that is, to locate the pull rod 810, so that the trip rod 820 can be accurately clamped with the pull rod 810. Specifically, the limit protrusions 812 are provided in two and symmetrically disposed at both sides of the first hook portion 811.

In this embodiment, referring to fig. 13 and 14, the trip drive assembly 850 includes a bimetal 851 coupled to the terminal block 230, wherein the bimetal 851 is deformed to push the pull rod 810 such that the pull rod 810 rotates relative to the housing 100 and is disengaged from the trip bar 820. In this embodiment, when the circuit breaker is overloaded, the bimetal 851 is bent and deformed due to the excessively high temperature of the wiring board 230 and pushes the traction rod 810, so that the traction rod 810 is disengaged from the trip rod 820, and the moving contact 212 is separated from the fixed contact 220, thereby realizing overload protection. Wherein the bimetal member 851 is fixed to the wiring board 230.

Specifically, the bimetal element 851 is provided with a plurality of bimetal elements and is connected with the wiring board 230 in a one-to-one correspondence, and the reliability of overload protection can be effectively improved by the design of the plurality of bimetal elements 851.

Specifically, the traction lever 810 is provided with a first pushing part 813, the first pushing part 813 is connected with a pushing part (not shown), the bimetal element 851 is deformed to be capable of pushing the pushing part, and the matching position relationship between the traction lever 810 and the bimetal element 851 is changed through the pushing part, so that the traction lever 810 and the trip lever 820 can be reliably separated when overload occurs.

It should be noted that the pushing member can be adjusted with respect to the traction rod 810 to facilitate adjustment. Specifically, the first pushing part 813 is provided with a through hole, the pushing piece is inserted in the through hole, and two sides of the through hole are provided with screw connectors in threaded connection with the pushing piece.

In this embodiment, referring to fig. 13, 14 and 16, the trip drive assembly 850 further includes a yoke 852 and an armature 853, the yoke 852 being coupled to the terminal block 230; the armature 853 is disposed on the yoke 852, and the armature 853 can rotate relative to the yoke 852 to rotate the traction lever 810 relative to the housing 100, so that the traction lever 810 is disengaged from the trip lever 820. In this embodiment, when the circuit breaker is shorted, under the electromagnetic field generated by the short-circuit current through the wiring board 230, the armature 853 rotates relative to the yoke 852 to drive the traction lever 810 to rotate relative to the housing 100, the traction lever 810 is disengaged from the trip lever 820, and the short-circuit protection is implemented in response to the speed block. Wherein the yoke 852 is fixed to the wiring board 230.

Specifically, the yokes 852 and the armatures 853 are provided with a plurality of groups and are connected with the wiring board 230 in a one-to-one correspondence, and the reliability of the short circuit protection can be effectively improved by the design of the plurality of groups of yokes 852 and the armatures 853.

Specifically, the trip driving assembly 850 further includes a transmission member 854 rotationally connected to the yoke 852, the transmission member 854 is provided with an insertion hole 8541 and a pushing portion 8542, the armature 853 is provided with an insertion shaft 8531, the insertion shaft 8531 is inserted into the insertion hole 8541, and when the armature 853 cooperates with the insertion hole 8541 to drive the transmission member 854 to rotate through the insertion shaft 8531, the pushing portion 8542 can push the traction rod 810 to enable the traction rod 810 to rotate relative to the housing 100 and to be disengaged from the trip rod 820, so that linkage is reliable and stable.

Specifically, the traction rod 810 is provided with a second pushing portion 814, and the pushing portion can push the second pushing portion 814 to rotate the traction rod 810 relative to the housing 100.

In this embodiment, referring to fig. 13 and 14, the trip drive assembly 850 further includes a trip button 855. Wherein the trip button 855 is slidably connected to the housing 100, and the trip button 855 can slide toward the traction lever 810 and push the traction lever 810 to rotate the traction lever 810 relative to the housing 100 and disengage the trip lever 820. In this embodiment, when the trip button 855 is pressed, the trip button 855 slides towards the traction rod 810 and pushes the traction rod 810 to enable the traction rod 810 to rotate relative to the housing 100 and to be disengaged from the trip rod 820, the trip button 855 is released, the traction rod 810 is reset under the action of the second elastic member 840 to wait for the next engagement with the trip rod 820, and the trip button 855 is driven to reset by the traction rod 810.

Specifically, the traction lever 810 is provided with a third pushing portion 815, and the trip button 855 can push the third pushing portion 815 to rotate the traction lever 810 relative to the housing 100.

In this embodiment, referring to fig. 15, the circuit breaker further includes a shunt release 900 disposed in the housing 100, the shunt release 900 is connected to the trip 620, and the trip 620 can be disengaged from the latch 710 by the shunt release 900. The shunt release is in the prior art, and will not be described in detail herein.

In the present embodiment, referring to fig. 17, the rocker arm 610 includes a rocker arm bracket 612 rotatably coupled to the bracket 400 and a lever 611 coupled to the rocker arm bracket 612. Further, the rocker arm support 612 is provided with a positioning groove 6121, the deflector rod 611 is provided with a protruding portion 6111 spliced with the positioning groove 6121, and the position of the rocker arm support 612 and the deflector rod 611 is fixed by matching with the limit of the shell 100 to the deflector rod 611. Further, a pushing shaft 6122 is provided on the rocker arm stand 612, and the push jump button 620 is pushed by the pushing shaft 6122. Further, a pushing protrusion 6112 is provided on the lever 611, and the lever 611 pushes the trip lever 820 by pushing the pushing protrusion 6112.

In this embodiment, referring to fig. 15 and 18, the arc extinguishing device 300 includes a plurality of arc extinguishing bars 320 arranged at intervals along the direction from the first end to the second end of the housing 100, and the arc extinguishing device 300 further includes an arc striking plate 330, and the arc is elongated by the arc striking plate 330 to fully enter the arc extinguishing chamber to satisfy the high voltage breaking. The arc striking plate 330 corresponding to the fixed contact 220 is fixedly connected with the fixed contact 220.

Specifically, the arc extinguishing device 300 further includes two oppositely disposed side plate assemblies 310, an arc extinguishing chamber is formed between the side plate assemblies 310 and the housing 100, and an arc extinguishing gate 320 and an arc striking plate 330 are disposed between the two side plate assemblies 310.

In this embodiment, the arc extinguishing bars 320 are divided into two groups, and are arranged in one-to-one correspondence with the fixed contact 220 and the moving contact 212, the arc extinguishing bars 320 of the same group are arranged in parallel, the two groups of arc extinguishing bars 320 are arranged at an included angle, and the two groups of arc extinguishing bars 320 are gradually far away from each other from top to bottom.

In this embodiment, with continued reference to fig. 15, the side plate assembly 310 includes an insulating plate 312, and the arc chute 320 and the arc striking plate 330 are both fixed to the insulating plate 312.

Specifically, the gas generating pieces 311 are components of the side plate assembly 310, the gas generating pieces 311 are located above the insulating plate 312 and are disposed corresponding to the contact assemblies 210, and the moving contact 212 moves between the two gas generating pieces 311. Further, the arc extinguishing device 300 further includes a ventilation plate 340. In this embodiment, the gas generating member 311 generates a large amount of gas under the high temperature erosion of the arc when the circuit breaker is broken, so that the pressure of the arc extinguishing chamber is increased, and the pressure difference between the pressure and the atmospheric pressure outside the arc extinguishing chamber can form the gas flow passing through the ventilation plate 340 from the arc extinguishing chamber, and the gas flow has a cooling effect on the arc and generates a driving force on the arc, so that the arc is forced to enter the arc extinguishing grid 320.

Specifically, the gas generating member 311 is provided with a magnetism increasing member (not shown), through which the gas yield of the gas generating member 311 can be greatly increased. Further, a receiving groove is disposed at a side of the gas generating member 311 facing away from the contact assembly 210, a magnetism enhancing member is disposed in the receiving groove, an insulating cover 313 is disposed at a side of the magnetism enhancing member facing towards the contact assembly 210, and the magnetism enhancing member is fixed in the gas generating member 311 through the insulating cover 313.

Further, the gas generating member 311 is provided with a plurality of grid grooves, and the arc extinguishing grid plates 320 are inserted into the grid grooves, so that stable intervals between the arc extinguishing grid plates 320 are maintained through the grid grooves.

In the present embodiment, the case 100 includes an inner case 110, and the arc extinguishing device 300 is disposed inside the inner case 110. Further, a limiting portion 101 is provided on the inner case 110. Further, the limit protrusion 812 can abut the inner housing 110 to limit the rotation of the pull rod 810 toward the trip bar 820.

Example two

The link assembly 500 of the operating mechanism in the circuit breaker according to the present embodiment is different from the first embodiment, in this embodiment, referring to fig. 19, the link assembly 500 includes a first link 510 and a second link 520 which are sequentially rotatably connected, the first link 510 is rotatably connected with the rocker arm assembly 600, and the second link 520 is used for rotatably connecting the contact assembly 210. In this embodiment, the third link 530 is removed, and the second link 520 is directly connected with the contact assembly 210, so as to reduce the transmission chain, simplify the transmission structure, and effectively improve the stability of the operating mechanism.

Specifically, the contact support 211 is provided with a contact rotation shaft 2111, and the contact support 211 is rotatably connected to the second link 520 through the contact rotation shaft 2111. In this embodiment, the contact shaft 2111 is disposed in the third chute 430 to ensure stability of the link assembly 500.

The other structures of the circuit breaker provided in this embodiment are the same as those of the first embodiment, and will not be described in detail herein.

Example III

In the embodiment, as shown in fig. 19, a boss 2112 is provided on a side surface of the contact support 211, and adjacent bosses 2112 are fixedly connected to realize fixed connection between a plurality of contact supports 211, so as to effectively ensure coaxiality between the contact supports 211. Wherein the boss 2112 is located at the center of the contact support 211 for ease of positioning.

Specifically, the bosses 2112 may be fixedly connected by an intermediate member. In this embodiment, the boss 2112 is cylindrical, the cross section of the boss 2112 may be polygonal or circular, and the two ends of the intermediate member are provided with connecting grooves having the same shape as the boss 2112. Further, to yield the trip mechanism 800, a yield slot is formed in the middleware.

The other structure of the circuit breaker provided in this embodiment is the same as that of the first embodiment, and will not be described in detail herein.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (11)

1. The tripping mechanism is applied to the circuit breaker, and its characterized in that, the tripping mechanism includes:

a traction lever (810) for rotational connection with the housing (100) of the circuit breaker;

the tripping rod (820) is rotatably connected with the shell (100), and an operating mechanism of the circuit breaker can drive the tripping rod (820) to rotate towards the traction rod (810) so as to realize the clamping connection of the tripping rod (820) and the traction rod (810);

a first elastic member (830) connected to the trip bar (820), the first elastic member (830) enabling the trip bar (820) to always have a tendency to rotate away from the traction bar (810);

A second elastic element (840) connected with the traction rod (810), wherein the second elastic element (840) enables the traction rod (810) to always have a trend of rotating towards the tripping rod (820) so as to enable the traction rod (810) to be suitable for being clamped with the tripping rod (820);

the tripping driving assembly (850) is arranged corresponding to the traction rod (810), and the tripping driving assembly (850) is used for driving the traction rod (810) to rotate back to the tripping rod (820) so as to realize the separation and clamping connection of the traction rod (810) and the tripping rod (820).

2. The trip mechanism of claim 1, wherein the traction bar (810) includes a first hook portion (811) capable of being engaged with the trip bar (820), a limit protrusion (812) is provided on the first hook portion (811), and the limit protrusion (812) is capable of abutting the housing (100) to limit rotation of the traction bar (810) toward the trip bar (820).

3. The trip mechanism of claim 1 or 2, wherein the trip drive assembly (850) includes a bimetal (851), the bimetal (851) being configured to connect with a terminal block (230) of the circuit breaker, the bimetal (851) being deformable to push against the drawbar (810) to rotate the drawbar (810) relative to the housing (100) and out of engagement with the trip bar (820).

4. A trip mechanism according to claim 3, characterized in that said traction lever (810) is provided with a first abutment portion (813), said first abutment portion (813) being connected to an abutment member against which said bimetal element (851) is deformable.

5. A trip mechanism according to claim 3, characterized in that said bimetal member (851) is provided in plurality and is connected in one-to-one correspondence with said wiring board (230).

6. The trip mechanism of claim 1 or 2, wherein the trip drive assembly (850) comprises:

a yoke (852) for connecting with a wiring board (230) of the circuit breaker;

and the armature (853) is arranged on the magnetic yoke (852), and the armature (853) can rotate relative to the magnetic yoke (852) to drive the traction rod (810) to rotate relative to the shell (100) so as to enable the traction rod (810) to be disengaged from the tripping rod (820).

7. The trip mechanism of claim 6, wherein the trip drive assembly (850) further comprises a transmission member (854) rotatably connected to the yoke (852), the transmission member (854) is provided with an insertion hole (8541) and a pushing portion (8542), the armature (853) is provided with an insertion shaft (8531), the insertion shaft (8531) is inserted into the insertion hole (8541), and when the armature (853) cooperates with the insertion hole (8541) through the insertion shaft (8531) to drive the transmission member (854) to rotate, the pushing portion (8542) can push the traction rod (810) to enable the traction rod (810) to rotate relative to the housing (100) and be disengaged from the trip rod (820).

8. The trip mechanism of claim 1 or 2, wherein the trip drive assembly (850) includes a trip button (855) for sliding connection with the housing (100), the trip button (855) being slidable toward the drawbar (810) and pushing against the drawbar (810) to rotate the drawbar (810) relative to the housing (100) and out of engagement with the trip bar (820).

9. The circuit breaker, its characterized in that includes:

a housing (100);

an operating mechanism provided at a first end of the housing (100);

a contact assembly (210), the contact assembly (210) being disposed at a second end of the housing (100);

the trip mechanism (800) of any one of claims 1-8, disposed at a second end of said housing (100);

the arc extinguishing device (300) is arranged in the shell (100) and corresponds to the contact assembly (210), and the arc extinguishing device (300) extends from the first end of the shell (100) to the second end of the shell (100).

10. The circuit breaker of claim 9, wherein said contact assembly (210) is provided in plurality, said trip bar (820) being located between two adjacent ones (210) of said contact assemblies (210).

11. The circuit breaker of claim 9, wherein the operating mechanism, the contact assembly (210), and the trip mechanism (800) are located on the same side of the arc chute (300).