CN218274495U

CN218274495U - Quick-opening high-breaking miniature circuit breaker

Info

Publication number: CN218274495U
Application number: CN202221638329.7U
Authority: CN
Inventors: 谭青松; 许可
Original assignee: Wenzhou Nagul Power Technology Co ltd
Current assignee: Wenzhou Nagul Power Technology Co ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2023-01-10
Anticipated expiration: 2032-06-28

Abstract

The utility model relates to a high disconnected miniature circuit breaker of dividing of quick separating brake, which comprises a housin, the casing includes the working chamber, the working chamber is provided with the trip coil subassembly, tripping device, the moving contact, static contact and arc extinction mechanism, be provided with electrically conductive shell fragment between static contact and the moving contact, the moving contact below be provided with electrically conductive shell fragment complex auxiliary contact, arc extinction mechanism includes the arc extinguishing chamber, PTC subassembly and arc extinguishing bars subassembly, electrically conductive shell fragment is including setting up the conductive part between auxiliary contact and moving contact and the extension that links to each other with the PTC subassembly, the shaping is buckled with the lower extreme of conductive part to the extension. By adopting the technical scheme, when short circuit occurs, the elastic force generated by the conductive elastic sheet due to bending is applied to the auxiliary contact, so that rapid brake opening is realized, the brake opening speed is increased, and the arc extinguishing capacity is improved by matching with a corresponding arc extinguishing mechanism; the structure design is reasonable, the structure is simple, the manufacture is easy, the performance is reliable, the production cost is low, the practicability is good, and the double-contact design is adopted to be matched with the conductive elastic sheet, so that the breaking capacity is improved.

Description

Quick separating brake high breaking micro breaker

Technical Field

The utility model relates to a low-voltage apparatus technical field especially relates to a quick separating brake high divides disconnected miniature circuit breaker.

Background

The existing miniature circuit breaker comprises an operating system, an arc extinguishing system, a tripping mechanism, a contact system, a shell, an operating handle and the like, and a main contact of the miniature circuit breaker is manually operated or electrically switched on. After the main contact is closed, the free tripping mechanism locks the main contact at a switching-on position. The coil of the over-current release and the thermal element of the thermal release are connected with the main circuit in series, and the coil of the under-voltage release is connected with the power supply in parallel. When the circuit is short-circuited or seriously overloaded, the armature of the overcurrent release is attracted, so that the free release mechanism acts, and the main contact breaks the main circuit. When the circuit is overloaded, the thermal element of the thermal release heats up to bend the bimetallic strip and push the free tripping mechanism to act. When the circuit is under-voltage, the armature of the under-voltage release releases, and the free release mechanism also acts.

Along with electric power system rapid development, miniature circuit breaker application range is wide, the quantity is many, in order to promote product stability and reduce material cost effectively to promote the competitiveness of product, need improve current circuit breaker structure, so that satisfy when breaking apart big short-circuit current, the moving contact can realize breaking fast, with this breaking capacity who improves the product, also promotes miniature circuit breaker's electric life simultaneously.

SUMMERY OF THE UTILITY MODEL

To sum up, for overcoming prior art's not enough, the utility model provides a quick separating brake high divides disconnected miniature circuit breaker.

In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a quick separating brake high breaking micro circuit breaker, includes the casing, the casing includes the working chamber, be provided with trip coil subassembly, tripping device, moving contact, static contact and arc extinction mechanism in the working chamber, the static contact with be provided with electrically conductive shell fragment between the moving contact, the moving contact below be provided with electrically conductive shell fragment complex auxiliary contact, arc extinction mechanism includes arc extinguishing chamber, PTC subassembly and arc extinguishing bars subassembly, electrically conductive shell fragment including set up in auxiliary contact with between the moving contact conductive part and with the extension that the PTC subassembly links to each other, the shaping is buckled to the lower extreme that the extension passes through the conductive part.

By adopting the technical scheme, when the moving contact moves towards the direction of the fixed contact, the auxiliary contact swings to contact with the conductive elastic sheet firstly, so that the conductive elastic sheet is driven to bend to form a closed auxiliary series circuit until the moving contact and the fixed contact are contacted to form a parallel circuit, because the arc extinguishing mechanism is internally provided with the PTC component, the PTC component is in a normal state, the resistance value is very small, generally from a few ohms to dozens of ohms, when a short-circuit large current passes, the instantaneous resistance becomes exponentially large, the reaction time is shorter when the short-circuit current is larger, the short-circuit current 50KA can be clamped below 1KA within 0.5ms, when the short-circuit occurs, the tripping coil component is matched with the tripping mechanism to disconnect the moving contact and the fixed contact, at the moment, the elastic force generated by bending of the conductive elastic sheet is applied to the auxiliary contact, so that the moving contact and the fixed contact are disconnected more quickly, the purpose of quick switching-off is realized, the switching-off speed of the circuit breaker is improved, the distance between the contacts is increased greatly within the same time, the reduction is matched with the corresponding arc extinguishing mechanism, the strong arc extinguishing effect is exerted within a short time, and the arc extinguishing gap after the arc extinguishing can be obtained within a short time, and the electric field intensity is improved; meanwhile, in the process of resetting the conductive elastic sheet, the auxiliary contact is still physically connected with the conductive elastic sheet for a certain time, at the moment, the current can only pass through the auxiliary contact, the conductive elastic sheet and the serially connected PTC assembly, the temperature of the PTC assembly rises sharply, and due to the PTC assembly effect, the PTC assembly limits the short-circuit current and consumes most of breaking energy until the auxiliary contact is disconnected with the conductive elastic sheet.

The utility model discloses further set up: the arc extinguishing cover is including being used for the installation cavity of PTC subassembly and the arc extinguishing cavity that is used for installing the arc extinguishing bars subassembly, the installation cavity corresponds casing dismouting direction opening setting, the installation cavity center is provided with and is used for the installation the draw-in groove of PTC subassembly, draw-in groove and installation cavity diapire parallel arrangement, PTC subassembly both sides tip are inserted and are located in the draw-in groove, both sides are provided with first spring leaf and second spring leaf respectively about the PTC subassembly, first spring leaf set up in PTC subassembly below and with extension body coupling, the second spring leaf set up in PTC subassembly top and with trip coil assembly elastic connection.

By adopting the technical scheme, the arc-extinguishing grid and the PTC component are modularly assembled through the integrally formed arc-extinguishing cover, so that the installation is convenient and rapid; the PTC component is positioned through the first spring piece and the second spring piece, and meanwhile, the installation stability of the PTC component is further improved through matching with the clamping groove; the first spring piece is used for realizing the breaking of the auxiliary contact, and the second spring piece is used for realizing the elastic connection of the tripping coil assembly so as to realize the series connection of the auxiliary circuit; the installation cavity corresponds to the opening of the shell dismounting direction, namely the installation cavity corresponds to the direction of the fixed contact, the arc extinguishing cover plays a role in blocking and protecting the installation cavity, and the PTC component can be prevented from being influenced by electric arc.

The utility model discloses further set up: the PTC subassembly includes the contact piece and sets up in the PTC component on both sides about the contact piece, the position that diapire and upper wall are pressed close to the installation cavity is provided with the installation slot respectively, the installation slot with draw-in groove parallel arrangement, the installation slot the draw-in groove corresponds the all opening settings of shells inner wall's one end, first spring leaf include with the installation department of installation slot looks adaptation, be used for connecting the card portion of PTC component and be used for the first connecting portion be connected with the extension, the second spring leaf include with the installation department of installation slot looks adaptation, be used for connecting the card portion of PTC component and be used for the second connecting portion be connected with the trip coil subassembly.

By adopting the technical scheme, 2 PTC elements are adopted, compared with a plurality of PTC elements, the structure is simplified, the size of the module is reduced, the PTC element module can be used for a miniature circuit breaker, the structure is more reasonable, and PTC elements of different types can be adopted according to requirements, so that different current limiting capacities are achieved; the installation slot is arranged, the first spring piece and the second spring piece are installed in a clamping mode, and compared with welding, disassembly and replacement are convenient, so that the service life of a product is prolonged, and meanwhile, the installation is convenient and rapid, the stability of the first spring piece and the second spring piece is improved due to the arrangement of the installation slot, the opening is arranged towards the inner wall direction, assembly is carried out from the rear of the module, after the assembly of the module is completed, the arc extinguishing mechanism is arranged in the shell, the shell plays a role in protecting the module, components cannot be disassembled from the front end of the installation cavity, and the stability of the installation of the PTC assembly, the first spring piece and the second spring piece is further improved; the PTC component is connected with the clamping parts on the two sides, so that the PTC component is positioned, and the stability of the PTC component is improved; through first connecting portion and second connecting portion respectively with conducting strip, trip coil subassembly, but first spring leaf and conducting strip integrated into one piece need not extra connecting piece, make things convenient for arc extinguishing mechanism integration, modularization, improve stability, while easy to assemble.

The utility model discloses further set up: the arc extinguishing cover is provided with an inverted L-shaped slot used for installing the second connecting portion above the opening end of the installing slot close to the upper wall, the opening at the upper end of the inverted L-shaped slot is arranged, the inverted L-shaped slot is communicated with the corresponding installing slot, and the inverted L-shaped slot is matched with the second connecting portion.

Through adopting above-mentioned technical scheme, when inserting the second spring leaf from the installation cavity rear end and locating on the arc extinguishing cover, the installation slot of locating in the installation cavity is inserted to the installation department of second spring leaf, and the second connecting portion set up in the arc extinguishing cover upper end and link to each other with trip coil subassembly's bottom, accomplish the equipment back when the second spring leaf, the thickness and the arc extinguishing cover shell parallel and level of second connecting portion (promptly the type of falling L slot with second connecting portion looks adaptation) for the module is changeed the installation with the casing, and is more stable.

The utility model discloses further set up: the tripping coil assembly comprises a magnetic yoke, and an iron core sleeve and a coil which are arranged in the magnetic yoke, wherein a static iron core is arranged on one side of the iron core sleeve corresponding to the moving contact, a moving iron core is arranged on the other side of the iron core sleeve, the iron core sleeve is hollow and arranged in the iron core sleeve, the moving iron core drives the ejector rod to slide along the inner wall of the iron core sleeve, a moving hole for the movement of the ejector rod is formed in the static iron core, and the static contact is arranged on one side of the magnetic yoke corresponding to the moving contact.

By adopting the technical scheme, when the main circuit is in short circuit, the coil generates a magnetic field by large current, the movable iron core drives the ejector rod to eject towards the direction of the static iron core, and the tripping mechanism is driven to realize tripping of the movable contact and disconnection of the static contact.

The utility model discloses further set up: the second connecting portion is arranged between the magnet yoke and the arc extinguishing cover, and arched connecting points are integrally arranged at positions, close to the magnet yoke, of the second connecting portion and are in elastic contact with the magnet yoke.

By adopting the technical scheme, the arc extinguishing chamber is convenient to clamp and install, is in elastic contact with the arc extinguishing chamber, and is more reasonable in arrangement and reliable in work.

The utility model discloses further set up: the arc extinguishing chamber is provided with the installation of being used for the installation below the open end of the installation slot that the arc extinguishing chamber corresponds and is close to the diapire the L type socket of first connecting portion, the upper end of L type socket is linked together with the open end of the installation slot that is close to the diapire, the lower extreme of L type socket with the arc extinguishing chamber is linked together, the lower extreme of L type socket corresponds one side opening setting of extension.

By adopting the technical scheme, the first connecting part is bent and inserted into the arc extinguishing chamber, the first connecting part is hidden at the rear end of the arc extinguishing chamber, the stability of connection of the first spring piece is further improved through the protection of the shell and the arc extinguishing chamber, and the first spring piece is not easy to damage; the lower end of the L-shaped socket corresponds to an opening on one side of the extending part, and the opening is formed by integrally forming the first spring piece and the conductive elastic piece, so that the conductive elastic piece is convenient to mount.

The utility model discloses further set up: the lower end of the first connecting portion is inserted into an arc extinguishing cavity through an L-shaped socket, the arc extinguishing cavity corresponds to the opening in the direction of the extending portion, one end of the extending portion stretches into the arc extinguishing cavity from the opening and is connected with one side of the lower end of the first connecting portion, the arc extinguishing cavity and the first connecting portion are integrally formed, and the arc extinguishing grid assembly is arranged below the first connecting portion.

Through adopting above-mentioned technical scheme, the lower extreme of first connecting portion inserts through L type socket and locates the arc extinguishing chamber in, draws the arc extinguishing chamber fast with the electric arc that the contact separation produced for arc extinguishing time has improved breaking capacity, has protected the contact, prevents simultaneously that electric arc from getting into the installation cavity, has protected the PTC subassembly.

The utility model discloses further set up: the arc extinguishing chamber with be provided with the flash barrier between the moving contact, the junction that the flash barrier corresponds conductive part and extension is provided with the spacing that is used for injecing the conductive part resilience, spacing set up in conductive elastic sheet is relative the opposite side of arc extinguishing chamber, spacing bar form with conductive elastic sheet looks adaptation, spacing highly being less than auxiliary contact, be provided with the mounting hole on the flash barrier, correspond in the casing the position of mounting hole be provided with the reference column of mounting hole looks adaptation.

Through adopting above-mentioned technical scheme, set up the flash barrier and reduce the electric arc influence that the moving contact produced, set up spacing to the shell fragment resilience of reseing and play the effect of injecing and buffering, the installation of being convenient for simultaneously, spacing highly being less than auxiliary contact, the contact of the auxiliary contact of being convenient for and conductive part sets up mounting hole and reference column, the installation flash barrier of being convenient for, and it is good to improve the accuracy of flash barrier installation simultaneously, and stability is high

The utility model discloses further set up: the arc extinguishing device is characterized in that a wire inlet cavity and a wire outlet cavity are respectively arranged on two sides of the shell, a bimetallic strip is arranged in the wire outlet cavity and connected with an arc striking plate, and the arc striking plate comprises a connecting clamp part clamped below the arc extinguishing cover, an arc extending part extending upwards towards the direction of the movable contact and a third connecting part connected with the bimetallic strip.

Through adopting above-mentioned technical scheme, arc chamber is introduced fast to the arc extinguishing that the arc extension produced because of the separation with the moving contact, carries out the arc extinguishing through the arc extinguishing bars subassembly, and the cooperation striking piece, dual striking has improved the arc extinguishing effect greatly.

The following description of the embodiments of the present invention refers to the accompanying drawings and examples.

Drawings

FIG. 1 is a front view of the internal structure of the embodiment of the present invention;

fig. 2 is a perspective view of a partial structure of an embodiment of the present invention;

fig. 3 is an exploded view of a partial structure of an embodiment of the present invention;

reference numerals: 1. the novel energy-saving arc extinguishing device comprises a shell, 11 working chambers, 12 wire inlet chambers, 13 wire outlet chambers, 14 positioning columns, 2 tripping coil assemblies, 21 magnetic yokes, 22 iron core sleeves, 23 coils, 24 static iron cores, 241 movable holes, 25 movable iron cores, 26 ejector rods, 3 tripping mechanisms, 4 movable contacts, 41 auxiliary contacts, 5 static contacts, 6 arc extinguishing mechanisms, 61 arc extinguishing covers, 611 installation chambers, 6111 clamping grooves, 6112 installation slots, 6113 inverted L-shaped slots, 6114.L-shaped sockets, 612 arc extinguishing chambers, 62.PTC assemblies, 621 first spring pieces, 6211 installation portions, 6212 clamping portions, 6213 first connection portions, 622 second spring pieces, 6221 second connection portions, 6222 connection points, 623 contact pieces, 624.PTC elements, 63 arc extinguishing grid assemblies, 7 conductive portions, 71 conductive portions, 72 extension portions, 8 bimetallic pieces, 9 arc striking plates, 91 connection portions, 92 arc striking plates, 92 arc connection portions, 93 limiting arc isolating plates, and 102 limiting arc isolating plates.

Detailed Description

The specific embodiments are only for explaining the present invention, and it is not a limitation to the present invention, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present invention.

Referring to fig. 1-3, the quick opening and high breaking miniature circuit breaker disclosed in this embodiment includes a housing 1, the housing 1 includes a working chamber 11, a trip coil 23 assembly 2, a trip mechanism 3, a movable contact 4, a fixed contact 5 and an arc extinguishing mechanism 6 are disposed in the working chamber 11, a conductive elastic sheet 7 is disposed between the fixed contact 5 and the movable contact 4, an auxiliary contact 41 matched with the conductive elastic sheet 7 is disposed below the movable contact 4, the arc extinguishing mechanism 6 includes an arc extinguishing cover 61, a PTC assembly 62 and an arc extinguishing bar assembly 63, the conductive elastic sheet 7 includes a conductive portion 71 disposed between the auxiliary contact 41 and the movable contact 4 and an extension portion 72 connected with the PTC assembly 62, and the extension portion 72 and a lower end of the conductive portion 71 are formed by bending.

The embodiment further provides that: the arc extinguishing cover 61 comprises an installation cavity 611 used for installing the PTC component 62 and an arc extinguishing cavity 612 used for installing the arc extinguishing grid component 63, the installation cavity 611 is arranged corresponding to an opening in the dismounting direction of the shell 1, a clamping groove 6111 used for installing the PTC component 62 is arranged in the center of the installation cavity 611, the clamping groove 6111 is parallel to the bottom wall of the installation cavity 611, the end parts of two sides of the PTC component 62 are inserted into the clamping groove 6111, a first spring piece 621 and a second spring piece 622 are respectively arranged on the upper side and the lower side of the PTC component 62, the first spring piece 621 is arranged below the PTC component 62 and is integrally connected with the extension part 72, and the second spring piece 622 is arranged above the PTC component 62 and is elastically connected with the tripping coil 23 component 2.

The embodiment further provides that: the PTC component 62 includes a contact piece 623 and PTC elements 624 disposed on the upper and lower surfaces of the contact piece 623, mounting slots 6112 are respectively disposed at positions of the mounting cavity 611 close to the bottom wall and the upper wall, the mounting slots 6112 are disposed in parallel to the slots 6111, the mounting slots 6112 and the ends of the slots 6111 corresponding to the inner wall of the housing 1 are both provided with openings, the first spring piece 621 includes a mounting portion 6211 adapted to the mounting slot 6112, a clamping portion 6212 for connecting the PTC elements 624, and a first connecting portion 6213 for connecting the extending portion 72, and the second spring piece 622 includes a mounting portion 6211 adapted to the mounting slot 6112, a clamping portion 6212 for connecting the PTC elements 624, and a second connecting portion 6221 for connecting the trip coil 23 component 2.

The embodiment further provides that: an inverted-L-shaped slot 6113 used for mounting the second connecting portion 6221 is arranged above an opening end of the arc extinguishing chamber 61, close to the mounting slot 6112 of the upper wall, and the inverted-L-shaped slot 6113 is provided with an opening at the upper end and communicated with the corresponding mounting slot 6112, and the inverted-L-shaped slot 6113 is matched with the second connecting portion 6221.

The embodiment further provides that: the trip coil 23 assembly 2 comprises a magnetic yoke 21, and an iron core sleeve 22 and a coil 23 which are arranged in the magnetic yoke 21, wherein the iron core sleeve 22 is provided with a static iron core 24 corresponding to one side of the movable contact 4, the other side of the iron core sleeve is provided with a movable iron core 25, the iron core sleeve 22 is hollow, the movable iron core 25 drives the ejector rod 26 to slide along the inner wall of the iron core sleeve 22, the static iron core 24 is provided with a movable hole 241 for the ejector rod 26 to move, and the static contact 5 is arranged on one side of the magnetic yoke 21 corresponding to the movable contact 4.

The embodiment further provides that: the second connecting portion 6221 is disposed between the yoke 21 and the arc extinguishing chamber 61, and a raised connecting point 6222 is integrally disposed at a position of the second connecting portion 6221 close to the yoke 21, and the connecting point 6222 is in elastic contact with the yoke 21.

The embodiment further provides that: an L-shaped socket 6114 used for mounting the first connecting portion 6213 is arranged below the opening end of the arc extinguishing chamber 61, which is close to the mounting slot 6112 of the bottom wall, corresponding to the lower portion of the opening end of the mounting slot 6112 of the bottom wall, the upper end of the L-shaped socket 6114 is communicated with the opening end of the mounting slot 6112 of the bottom wall, the lower end of the L-shaped socket 6114 is communicated with the arc extinguishing chamber 612, and the lower end of the L-shaped socket 6114 is arranged corresponding to the opening of one side of the extending portion 72.

The embodiment further provides that: the lower end of the first connecting portion 6213 is inserted into the arc-extinguishing chamber 612 through the L-shaped socket 6114, the arc-extinguishing chamber 612 is arranged corresponding to the opening in the direction of the extending portion 72, one end of the extending portion 72 extends into the arc-extinguishing chamber 612 from the opening and is connected with one side of the lower end of the first connecting portion 6213, the two are integrally formed, and the arc-extinguishing fence assembly 63 is arranged below the first connecting portion 6213.

The embodiment further provides that: an arc isolating plate 10 is arranged between the arc extinguishing chamber 61 and the movable contact 4, a limiting strip 101 used for limiting resilience of the conductive part 71 is arranged at a joint of the conductive part 71 and the extension part 72, corresponding to the arc isolating plate 10, the limiting strip 101 is arranged at the other side, opposite to the arc extinguishing chamber 61, of the conductive elastic sheet 7, the shape of the limiting strip 101 is matched with that of the conductive elastic sheet 7, the height of the limiting strip 101 is lower than that of the auxiliary contact 41, a mounting hole 102 is formed in the arc isolating plate 10, and a positioning column 14 matched with the mounting hole 102 is arranged in the position, corresponding to the mounting hole 102, in the shell 1.

The embodiment further provides that: the arc extinguishing device is characterized in that a wire inlet cavity 12 and a wire outlet cavity 13 are respectively arranged on two sides of the shell 1, a bimetallic strip 8 is arranged in the wire outlet cavity 13, the bimetallic strip 8 is connected with an arc striking plate 9, and the arc striking plate 9 comprises a connecting clamp portion 916212 clamped below the arc extinguishing cover 61, an arc extending portion 9272 extending upwards towards the direction of the moving contact 4 and a third connecting portion 93 connected with the bimetallic strip 8.

The above-mentioned "between" does not only mean between orientations and positions, but also means between interactions of different parts.

In the description herein, it will be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings to simplify the description of the present invention, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.

Although the terms of the housing 1, the working chamber 11, the wire inlet chamber 12, the wire outlet chamber 13, the positioning column 14, the trip coil 23 assembly 2, the magnetic yoke 21, the iron core sleeve 22, the coil 23, the stationary iron core 24, the movable hole 241, the movable iron core 25, the ejector rod 26, the trip mechanism 3, the movable contact 4, the auxiliary contact 41, the stationary contact 5, the arc extinguishing mechanism 6, the arc extinguishing cover 61, the mounting chamber 611, the card slot 6111, the mounting slot 6112, the inverted L-shaped slot 6113, the L-shaped socket 6114, the arc extinguishing chamber 612, the PTC assembly 62, the first spring plate 621, the mounting portion 6211, the card portion 6212, the first connecting portion 6213, the second spring plate 622, the second connecting portion 6221, the connecting point 6222, the contact piece 623, the PTC element 624, the arc extinguishing grid assembly 63, the conductive elastic piece 7, the conductive portion 71, the extending portion 72, the bimetallic strip 8, the arc guiding plate 9, the connecting card portion 916212, the arc extending portion 9272, the third connecting portion 93, the arc baffle 10, the limiting strip 101, the mounting hole 102, and the like are used more. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The utility model provides a quick separating brake high divides disconnected miniature circuit breaker, includes the casing, the casing includes the working chamber, the working chamber is provided with trip coil assembly, tripping device, moving contact, static contact and arc extinguishing mechanism, its characterized in that: the arc extinguishing mechanism comprises an arc extinguishing cover, a PTC assembly and an arc extinguishing bar assembly, wherein a conductive elastic sheet is arranged between the fixed contact and the movable contact, an auxiliary contact matched with the conductive elastic sheet is arranged below the movable contact, the arc extinguishing mechanism comprises an arc extinguishing cover, a PTC assembly and an arc extinguishing bar assembly, the conductive elastic sheet comprises a conductive part arranged between the auxiliary contact and the movable contact and an extension part connected with the PTC assembly, and the extension part is formed by bending the lower end of the conductive part.

2. The quick opening high breaking miniature circuit breaker according to claim 1, characterized in that: the arc extinguishing cover is including being used for the installation cavity of PTC subassembly and the arc extinguishing cavity that is used for installing the arc extinguishing bars subassembly, the installation cavity corresponds casing dismouting direction opening setting, the installation cavity center is provided with and is used for the installation the draw-in groove of PTC subassembly, draw-in groove and installation cavity diapire parallel arrangement, PTC subassembly both sides tip are inserted and are located in the draw-in groove, both sides are provided with first spring leaf and second spring leaf respectively about the PTC subassembly, first spring leaf set up in PTC subassembly below and with extension body coupling, the second spring leaf set up in PTC subassembly top and with trip coil assembly elastic connection.

3. The quick opening high breaking miniature circuit breaker of claim 2, characterized in that: the PTC subassembly includes the contact piece and sets up in the PTC component on both sides about the contact piece, the position that diapire and upper wall are pressed close to the installation cavity is provided with the installation slot respectively, the installation slot with draw-in groove parallel arrangement, the installation slot the draw-in groove corresponds the all opening settings of shells inner wall's one end, first spring leaf include with the installation department of installation slot looks adaptation, be used for connecting the card portion of PTC component and be used for the first connecting portion be connected with the extension, the second spring leaf include with the installation department of installation slot looks adaptation, be used for connecting the card portion of PTC component and be used for the second connecting portion be connected with the trip coil subassembly.

4. The quick opening high breaking miniature circuit breaker of claim 3 wherein: the arc extinguishing chamber is provided with the type of falling L slot that is used for installing the second connecting portion above the open end that corresponds the installation slot that is close to the upper wall, and the type of falling L slot upper end opening sets up, the type of falling L slot is linked together with corresponding installation slot, the type of falling L slot and second connecting portion looks adaptation.

5. The quick opening high breaking miniature circuit breaker according to claim 4, characterized in that: the tripping coil assembly comprises a magnetic yoke, an iron core sleeve and a coil, wherein the iron core sleeve and the coil are arranged in the magnetic yoke, one side, corresponding to the moving contact, of the iron core sleeve is provided with a static iron core, the other side of the iron core sleeve is provided with a moving iron core, the iron core sleeve is hollow and arranged in the iron core sleeve, the moving iron core drives the ejector rod to slide along the inner wall of the iron core sleeve, a movable hole for the ejector rod to move is formed in the static iron core, and the static contact is arranged on one side, corresponding to the moving contact, of the magnetic yoke.

6. The quick opening high breaking miniature circuit breaker according to claim 5, characterized in that: the second connecting portion are arranged between the magnet yoke and the arc extinguishing chamber, arched connecting points are integrally arranged at the positions, close to the magnet yoke, of the second connecting portions, and the connecting points are in elastic contact with the magnet yoke.

7. The quick opening high breaking miniature circuit breaker of claim 3 wherein: the arc extinguishing chamber is provided with the installation of being used for the installation below the open end of the installation slot that the arc extinguishing chamber corresponds and is close to the diapire the L type socket of first connecting portion, the upper end of L type socket is linked together with the open end of the installation slot that is close to the diapire, the lower extreme of L type socket with the arc extinguishing chamber is linked together, the lower extreme of L type socket corresponds one side opening setting of extension.

8. The quick opening high breaking miniature circuit breaker according to claim 7, characterized in that: the lower end of the first connecting portion is inserted into an arc extinguishing cavity through an L-shaped socket, the arc extinguishing cavity corresponds to the opening in the direction of the extending portion, one end of the extending portion stretches into the arc extinguishing cavity from the opening and is connected with one side of the lower end of the first connecting portion, the arc extinguishing cavity and the first connecting portion are integrally formed, and the arc extinguishing grid assembly is arranged below the first connecting portion.

9. The quick opening high breaking miniature circuit breaker of claim 1 wherein: the arc extinguishing chamber with be provided with the flash barrier between the moving contact, the junction that the flash barrier corresponds conductive part and extension is provided with the spacing that is used for injecing the conductive part resilience, spacing set up in conductive elastic sheet is relative the opposite side of arc extinguishing chamber, spacing bar form with conductive elastic sheet looks adaptation, spacing highly being less than auxiliary contact, be provided with the mounting hole on the flash barrier, correspond in the casing the position of mounting hole be provided with the reference column of mounting hole looks adaptation.

10. The quick opening high breaking miniature circuit breaker according to claim 1, characterized in that: the arc extinguishing device is characterized in that an incoming line cavity and an outgoing line cavity are respectively arranged on two sides of the shell, a bimetallic strip is arranged in the outgoing line cavity, the bimetallic strip is connected with an arc striking plate, and the arc striking plate comprises a connecting clamp part clamped below the arc extinguishing cover, an arc extending part extending upwards towards the direction of the movable contact and a third connecting part connected with the bimetallic strip.