29results about How to "Improve arc extinguishing performance" patented technology

A two-side arc extinguishing type contact arc extinguishing system is characterized in that the two-side arc extinguishing type contact arc extinguishing system at least comprises an arc contact, an included angle is formed between a contact part of the arc contact and a rod part of the arc contact, and an arc channel of an arc extinguishing chamber corresponds to the contact part of the arc contact. By changing the shape of the contact part, not only is the width space of the product fully utilized, but also the electric repulsive force is formed to enable the electric arc magnetic blow-out force of the two-pole contact to face the two sides, so that the arc extinguishing effect is improved.

The utility model relates to a high-voltage plastic shell isolation switch. The high-voltage plastic shell isolation switch comprises a contact assembly and an arc extinguishing assembly. The contact assembly comprises a fixed contact and a moving contact, the fixed contact is fixedly arranged, the moving contact can be movably arranged relative to the fixed contact, and the moving contact and the fixed contact are electrically connected when being in contact; the arc extinguishing assembly comprises an arc extinguishing shell and gas generating parts, an arc extinguishing space is arranged in the arc extinguishing shell, the moving path of the moving contact is located in the arc extinguishing space, the two gas generating parts are located in the arc extinguishing space and arranged at intervals, the static contact and the moving contact are located between the two gas generating parts, and the spacing distance between the two gas generating parts is 8-12 mm. According to the scheme, when the moving contact and the static contact are disconnected, the exhaust speed is increased, airflow is equally divided, arc extinguishing is efficient, and then zero flashover is achieved.

The invention relates to the field of switches with arc extinguishing or arc preventing devices, in particular to a self-energy arc extinguishing chamber and a circuit breaker. The self-energy arc extinguish chamber comprises an air compression chamber cylinder barrel internally provided with a partition plate, a moving contact is installed in the air compression chamber cylinder barrel in a sealed and sliding mode on the front side of the partition plate, the moving contact is connected with a transmission rod penetrating through the partition plate in a sealed and sliding mode, an exhaust port is formed in the transmission rod, and an expansion chamber is formed in the moving contact. An air compression chamber is formed between the partition plate and the moving contact in the air compression type cylinder barrel, an exhaust chamber is formed on the side, opposite to the air compression chamber, of the partition plate, a pressure release valve and an air supplementing valve are arranged on the partition plate, a check valve is arranged on the moving main contact, an air supplementing opening is formed in the cavity wall of the exhaust chamber, and an air guide channel is formed between the air supplementing opening and the air supplementing valve. Gas exhausted from the transmission rod is isolated through the gas guide channel. Therefore, the high-temperature decomposed gas and impurities can be prevented from being supplemented into the air compression chamber along with the insulating gas, so that the gas supplemented into the air compression chamber is relatively clean insulating gas, and the arc extinguishing effect of the arc extinguishing chamber is improved.

The invention provides a circuit breaker with a thermal bimetal tripping linkage mechanism and a control method. Comprising a shell, a contact system, an operating mechanism, a locking mechanism, a thermal bimetallic strip overload protection mechanism, an electronic protection module, a mechanical linkage device and a state indicating device, the mechanical linkage device comprises an L-shaped driving lever capable of rotating around a rotating shaft, and the L-shaped driving lever is provided with a first driving arm and a second driving arm; the output end of the thermal bimetallic strip overload protection mechanism is operationally coupled with the first driving arm and is used for driving the first driving arm to enable the L-shaped shifting rod to rotate around the rotating shaft in a first direction during overload; the electronic protection module comprises an electromagnetic tripper, a movable ejector pin of the electromagnetic tripper is operatively coupled with the second driving arm, and the electromagnetic tripper is used for driving the second driving arm to enable the L-shaped shifting rod to rotate around the rotating shaft in a second direction opposite to the first direction during short circuit or electronic protection action; and the indicating piece displays different protection action type identifiers according to different rotation directions of the L-shaped driving lever.

The utility model discloses a moving and static contact connecting mechanism of an isolating switch, which relates to the technical field of isolating switches and comprises a bearing frame, a driving rod, a first insulating column, a first contact piece and a second traction rod. The brake control mechanism comprises a driving rod, a connecting brake rod, a first traction rod, a first insulating column and a second traction rod, the driving rod is connected with an external driving assembly to provide power for the first traction rod, the first insulating column and the second traction rod to drive the connecting brake rod to achieve the opening and closing functions, the optimal design of an arc extinguishing block and the application of a high-performance material are achieved, and the service life of the arc extinguishing block is prolonged. Therefore, the arc extinguishing efficiency is greatly improved, the damage of the arc to the contact and the surrounding parts is reduced, the maintenance cost is reduced, and the overall service life of the isolating switch is prolonged.

The utility model provides an arc extinguishing device of a low-voltage circuit breaker, which relates to the technical field of circuit breakers, and comprises a plurality of grid sheets and a grid sheet mounting rack which are arranged in sequence, the grid sheet mounting rack is used for mounting and supporting all the grid sheets, and the plurality of grid sheets form an arc extinguishing chamber; the number of the grid pieces is N, and the grid pieces are the first grid piece, the second grid piece,..., and the Nth grid piece. The central grid sheet is vertically arranged, the central grid sheet is used as a center axis, and the other grid sheets are arranged in a fan shape by taking the central grid sheet as a symmetry axis; according to the utility model, under the condition that the number of the grid sheets is not increased additionally, a fan-shaped arrangement structure is adopted, and the arc guide channels are arranged on the grid sheets, so that electric arcs can enter the arc extinguishing cover in an accelerated manner, the internal spaces of the grid sheets are gradually narrowed, and short arcs are shortened in an accelerated manner in the advancing process, thereby shortening the arc extinguishing time of the grid sheets and improving the arc extinguishing efficiency. And meanwhile, the arc extinguishing capability of the circuit breaker under large fault current is improved.

This utility model relates to the field of arc extinguishing devices and discloses a high-voltage narrow-slit pressurized arc extinguishing device, including an arc extinguishing shell, a mounting frame, an arc extinguishing assembly, and two first gas generating components. The bottom of the arc extinguishing shell is provided with a gas generating port, and the two first gas generating components are symmetrically arranged on both sides of the gas generating port. When the circuit breaker is tripped, the moving contact swings, causing the electric arc on it to enter between the two first gas generating components through the gas generating port. The arc extinguishing assembly is disposed on the mounting frame and is used to extinguish the electric arc between the two first gas generating components. A narrow slit is formed between the two first gas generating components, which makes the arc heat more concentrated, increases the arc voltage, accelerates the pyrolysis rate of the gas generating material, and generates more arc extinguishing gas per unit time, thereby improving the arc extinguishing effect.

A molded case circuit breaker comprises an operating mechanism, a contact mechanism and an interlocking mechanism, an operating handle drives a moving contact to move through the operating mechanism, the interlocking mechanism comprises an interlocking piece and an interlocking spring, and the interlocking spring is used for driving the interlocking piece to lock the moving contact in a state that the moving contact cannot be in contact with a static contact. In the process that the operating handle moves from the opening position to the closing position, when the operating handle moves to the interlocking position, the operating handle or the operating mechanism drives the interlocking piece to unlock the moving contact, the operating handle is driven by the energy storage spring to move to the opening position and the closing position, and when the operating mechanism is not closed in place, the interlocking piece is driven by the energy storage spring to unlock the moving contact. According to the technical scheme, pilot connection between the moving contact and the static contact can be avoided, an operator can be helped to judge the working state of a product, misjudgment is avoided, potential safety hazards are reduced, when the operating handle moves to the action position, the closing force of the energy storage spring is larger, the moving contact can be driven to make contact with the static contact rapidly, and the rapid closing function is achieved.

The application discloses a contact assembly and nanocrystalline relay and relates to the technical field of relays; the application comprises an insulating frame, two static sheets are arranged on the insulating frame, and static contacts are arranged on the static sheets; a movable plate is slidably arranged on the insulating frame, a dynamic sheet is arranged on the movable plate, two dynamic contacts are arranged on the dynamic sheet; a differential mechanism comprises a frame fixed to the insulating frame, first guide rods and second guide rods are rotatably penetrated into opposite inner walls of the frame; the force generated by an electromagnetic component does not directly act on the dynamic sheet, the differential mechanism is arranged, two-stage speed increase is realized by the differential mechanism, the moving stroke of the dynamic sheet is greater than the moving stroke of the first rack driven by the electromagnetic component, and the moving speed of the dynamic sheet is faster than the moving speed of the first rack driven by the electromagnetic component during the closing or breaking process; the separation speed and the breaking distance are increased, the contact breaking force is sufficient, the generation of electric arc is reduced, and therefore the practicability is improved.

This utility model belongs to the field of low-voltage electrical appliance technology and discloses a contact system and an automatic transfer switch. The contact system includes a housing and a contact assembly. The contact assembly includes a first stationary contact, a second stationary contact, and a moving contact disposed on the housing. The housing contains a first arc-extinguishing chamber and a second arc-extinguishing chamber. By providing corresponding arc-extinguishing chambers for the first and second stationary contacts, at least a portion of the first end of the moving contact corresponding to the first stationary contact is located within the first arc-extinguishing chamber, and at least a portion of the second end of the moving contact corresponding to the second stationary contact is located within the second arc-extinguishing chamber. Corresponding exhaust channels communicating with the arc-extinguishing chambers are provided, allowing energy generated on the first side to enter the first exhaust channel from the first arc-extinguishing chamber and be discharged through two first exhaust ports, and energy generated on the second side to enter the second exhaust channel from the second arc-extinguishing chamber and be discharged through two second exhaust ports. This avoids energy accumulation inside the housing, improves energy discharge efficiency, and effectively enhances the arc-extinguishing effect and equipment reliability.

This invention relates to the field of power distribution switchgear technology, and particularly to a load switch operating mechanism for a ring main unit, comprising a switch operating shaft, a grounding operating shaft, an energy storage component, and a limit component. The switch operating shaft is coaxially arranged with the switch drive shaft, and a first drive dial is located at its end; the grounding operating shaft is parallel to it above, and a second drive dial is located at its end. The energy storage component is pivotally connected to the switch drive shaft and the grounding operating shaft at both ends, respectively, enabling it to correspondingly perform closing and grounding energy storage and achieve rapid energy release during opening. The limit component includes a first driven dial, a second driven dial, a first limit arm, and a second limit arm. The two limit arms are respectively located above and below the first driven dial, ensuring reliable overshoot and rebound prevention when the switch is in the closed position performing an opening action; and reliable overshoot prevention when opening from the grounding position. When closing, the switch operating shaft rotates forward to unlock and store energy; when opening, it rotates backward to release energy and prevent overshoot and rebound; when grounding, the grounding operating shaft rotates backward to unlock and store energy.

This invention discloses a vacuum circuit breaker contact with a built-in reverse conductor, relating to the field of vacuum circuit breaker technology. The vacuum circuit breaker contact with a built-in reverse conductor includes a contact plate, a contact cup, a conductive rod, a reverse conductor, and a support structure. The contact plate is connected to the top of the contact cup, the conductive rod is connected to the contact cup, and the reverse conductor is disposed inside the contact cup. The support structure is connected to the circuit breaker housing via an insulating rod to ensure its relatively fixed position. A through groove is formed at the bottom of the contact cup, corresponding to the support structure passing through the through groove. Several first helical grooves are formed on the sidewall of the contact cup, and several second helical grooves are formed on the sidewall of the reverse conductor. The rotation direction of the second helical grooves is opposite to that of the first helical grooves. The vacuum circuit breaker uses this vacuum circuit breaker contact with a built-in reverse conductor. This invention can solve the problem in the prior art where residual magnetism between poles affects the breaking effect during interruption in DC vacuum circuit breakers, thus improving the breaking performance and reliability of DC vacuum circuit breakers.

A circuit breaker having an optimized structure, the circuit breaker comprising a circuit breaker housing, a release (5), a locking mechanism (4), an operating mechanism (2), a contact system (3), and an arc extinguishing system (6). The contact system comprises a moving contact (31) and a stationary contact, the moving contact moves relative to the stationary contact to implement connection or disconnection, and the movement of the moving contact forms a moving track. The contact system is approximately arranged at a central position, and the release, the locking mechanism, the operating mechanism, and the arc extinguishing system are approximately arranged on the outer periphery so as to surround the contact system. The moving track of the contact system is located below the contact system, the locking mechanism traverses above the contact system, the release and the operating mechanism are disposed on two sides of the contact system, respectively, and the arc extinguishing system is disposed below the contact system so as to at least partially cover the moving track.

The invention relates to the technical field of high-voltage switch equipment and vacuum arc extinguishing, in particular to a composite magnetic field contact structure and a vacuum arc extinguishing chamber based on the composite magnetic field contact structure. The contact blade assembly comprises an inner-ring contact blade and an outer-ring contact blade, the inner-ring contact blade is arranged in the central area of the facing cambered surface of the contact cup, and the outer-ring contact blade is circumferentially distributed on the radial outer side of the inner-ring contact blade; according to the invention, through the longitudinal magnetic field contact cup and the transverse magnetic field contact piece, an arc extinguishing mode that accumulation is prevented by utilizing longitudinal magnetism in an arc starting area and rotation is promoted by utilizing transverse magnetism in a diffusion area is realized, and the arc extinguishing capability of the vacuum arc extinguishing chamber is improved.

This utility model discloses an integrated arc extinguishing and arc suppression device and a circuit breaker having the same, including an arc extinguishing chamber unit and an arc suppression chamber unit. The arc suppression chamber unit is integrally connected to the arc extinguishing chamber unit through a set of mounting side plates, and an extension baffle is formed by the set of mounting side plates extending towards the circuit breaker wiring port. The mounting side plates and the extension baffles are integrally formed to constitute the side walls of the arc extinguishing chamber unit and the arc suppression chamber unit, respectively. In this integrated structure, the ends of the extension baffles directly cover the inner walls on both sides of the wiring port, forming a continuous arc extinguishing cavity and an arc suppression cavity, completely eliminating the gaps caused by assembly, structurally blocking the path of arc escape, and improving the overall arc extinguishing and arc suppression efficiency. The integrated arc extinguishing chamber and arc suppression chamber structure significantly compresses redundant space, improves the internal layout compactness without increasing the overall volume of the circuit breaker, and significantly improves the cabinet space utilization rate.

The utility model belongs to the field of low-voltage switch equipment, and particularly relates to an arc extinguishing structure of a circuit breaker, which comprises a circuit breaker shell, an arc extinguishing chamber, a static contact and a moving contact. The arc extinguish chamber comprises a first arc extinguish grid plate group, a second arc extinguish grid plate group and a third arc extinguish grid plate group which are arranged in sequence, and first arc extinguish grid plates of the first arc extinguish grid plate group are arranged along the horizontal direction; the third arc-extinguishing grid sheets of the third arc-extinguishing grid sheet group are obliquely arranged at an angle alpha relative to the horizontal direction, and the outlet ends of the third arc-extinguishing grid sheets incline towards the direction of the second arc-extinguishing grid sheet group; an included angle beta is formed between the second arc-extinguishing grid sheet of the second arc-extinguishing grid sheet group and the adjacent arc-extinguishing grid sheet; the circuit breaker shell is provided with an outlet and is arranged at the outer side of the outlet of the second arc extinguishing grid plate group; and a static contact point of the static contact and a movable contact point of the movable contact are arranged in an area among the first arc extinguishing grid sheet group, the second arc extinguishing grid sheet group and the third arc extinguishing grid sheet group. By optimizing the layout of the arc extinguishing grid sheets, the arc extinguishing effect is effectively improved, and the temperature rise of the circuit breaker is reduced.

This invention relates to the field of fuse technology and discloses a modular combined 10kV drop-out intelligent fuse, comprising: an insulating support and a mounting base disposed on the insulating support, and further comprising: an insulating cover fixed above the insulating support; a current transformer fixed above the insulating cover; a voltage plate fixed inside the current transformer and extending downward into the insulating cover; a thermal auxiliary component fixed to the insulating cover and the voltage plate; a swing base fixed below the insulating support; and a rocker arm rotatably disposed on the swing base. This invention uses a shape memory alloy spring as a passive thermal sensing and power output element, combined with a sealed hydraulic transmission, intermittent gear energy storage, and impact acceleration structure, to achieve highly reliable and rapid disconnection of the fuse tube and voltage plate under overload conditions. The entire thermal triggering mechanism is a purely mechanical passive solution, requiring no external power supply or electronic control unit, exhibiting strong anti-electromagnetic interference capability, and can stably trigger protection under extreme conditions of power failure and strong electromagnetic interference, thus improving the reliability of protection action.

This application provides an arc-extinguishing system and a circuit breaker, belonging to the field of electrical equipment technology. The arc-extinguishing system provided in this application includes a stationary contact, an arc-extinguishing chamber, and a stationary cover. The stationary contact includes a fixed part and a contact part connected to each other. The fixed part is connected to the base of the circuit breaker, and the contact part has a guide groove that extends through the contact part. The arc-extinguishing chamber is disposed on the contact part. The stationary cover is disposed on the portion of the contact part that does not contact the arc-extinguishing chamber. A hook and a limiting block are provided on the side of the stationary cover facing the contact part. The hook passes through the guide groove and hooks to the side of the contact part facing away from the stationary cover. The limiting block is located within the guide groove and contacts the groove wall. The stationary cover mentioned in this application can limit the position of the stationary cover in the thickness, length, and width directions of the stationary contact, reducing the probability of changes in the relative position between the stationary cover and the stationary contact. This improves the shielding efficiency of the stationary cover on the contact part, thereby increasing the reliability of the arc-extinguishing system.

The present application relates to a kind of arc extinguishing assembly and circuit breaker comprising the arc extinguishing assembly, the arc extinguishing assembly includes: side member, at a certain distance apart from each other and oppositely configuration;Exhaust part, set in the upper portion of the side member;Multiple grids, set between the side member, and both ends are fixed to each side member;Arc guider, one side is combined with the side member, set in the lower portion of multiple grids;And magnet, set as in the lower portion of multiple grids, both ends are combined with the side member respectively, and electromagnetic force is formed in the direction towards the grid.

The utility model belongs to the technical field of combined electric appliances, and particularly relates to an SF6N2 mixed gas insulated metal-enclosed environment-friendly combined electric appliance. The SF6N2 mixed gas insulated metal-enclosed environment-friendly combined electric appliance comprises a bottom frame on which a circuit breaker and a bus three-position switch are arranged, and is characterized in that one end of the circuit breaker is connected with an isolating switch, the other end of the circuit breaker is connected with a current transformer, the current transformer is connected with a circuit three-position switch, the circuit three-position switch is connected with a branch bus, and the branch bus is connected with the isolating switch. And a quick grounding switch is connected below the branch bus. The beneficial effects of the utility model are that except that the gas chamber of the circuit breaker is filled with SF6 gas, the other gas chambers are all filled with SF6N2 mixed gas, the insulation performance of the original SF6 is maintained, the electric strength is high, the arc extinguishing capability is strong, the discharge amount of greenhouse gases such as SF6 is reduced, the structure is compact, the reliability is high, the modularization is high, and the installation and debugging are convenient and fast.

The invention discloses a contact mechanism and a vacuum circuit breaker, and relates to the technical field of circuit breakers. The contact mechanism comprises a moving contact, a static contact and a transverse magnetic field structure. The moving contact comprises a first contact part, the static contact comprises a second contact part, the arc extinguishing structure is arranged on the first contact part and / or the second contact part, the transverse magnetic field structure is used for generating a transverse magnetic field, so that the moving contact and the static contact form a rotary switching arc during opening and closing, and the arc extinguishing structure is used for extinguishing the switching arc. The contact mechanism provided by the invention can effectively improve the arc voltage of the switching arc, improve the arc extinguishing efficiency, enhance the arc extinguishing effect, improve the safety, meet the direct current breaking requirement and expand the application scene.

A circuit breaker comprises a shell, an operating mechanism and at least one switch unit, the operating mechanism and the switch unit are arranged in the shell, each switch unit comprises a contact mechanism, each contact mechanism comprises a contact cover rotationally arranged on a contact support, each contact cover is provided with one of a guide protrusion and a guide groove, and the guide protrusions are arranged in the guide grooves. One of a guide bulge and a guide groove is arranged in the shell, the other one of the guide bulge and the guide groove is arranged in the shell, the guide bulge is inserted into the guide groove for sliding fit, the contact support can drive the guide bulge to slide along the guide groove, the contact cover is driven to rotate relative to the contact support through the guide bulge and the guide groove, and when the moving contact is separated from the static contact, the contact cover is driven to rotate relative to the contact support. When the moving contact is in contact with the static contact, the contact cover is separated from the moving contact and the static contact, the contact cover does not need to be driven to rotate by using gravity or a spring, and the contact cover is separated from the static contact before the contact support moves until the opening is completely in place. And the contact cover can move in place and is shielded between the moving contact and the static contact.

This utility model relates to an enhanced active fuse, comprising a housing, within which, from top to bottom, are sequentially arranged an excitation device, a power module, a conductor bar, and at least one cooling chamber. The portion of the conductor bar located within the housing has at least one reinforcing element. A heat-absorbing portion is disposed within the cooling chamber. The housing and the conductor bar are fixed together by a coupling. This utility model significantly improves arc extinguishing efficiency through two different arc extinguishing methods: gas-pressurized arc extinguishing by the reinforcing element and arc extinguishing by melting and absorbing heat by the heat-absorbing portion. Simultaneously, the sealing structure and coupling on the conductor bar enhance airtightness, thereby improving the arc extinguishing effect and reliability of the fuse under complex operating conditions, and extending its service life.

Residual current circuit breaker, including shell, residual current module, L pole unit and N pole unit, residual current module includes electronic component board, zero sequence transformer and residual current operating release; N pole unit includes first N pole terminal, N pole moving contact, N pole static contact and second N pole terminal, further includes N pole operating mechanism and N pole short circuit protection device. Residual current circuit breaker of the application, through N pole inner compact structure, reasonable layout, N pole operating mechanism is obliquely arranged above and right side of residual current operating release, and above N pole moving contact, make the lower part of residual current operating release and the space between second N pole terminal and N pole static contact is sufficient, make N pole can set electronic component board, residual current operating release and at least part zero sequence transformer, also can have short circuit protection device and operating mechanism, not only have short circuit protection, also improve the reliability of N pole contact closing contact.

An arc extinguishing system of a circuit breaker comprises an arc extinguishing chamber; the static contact assembly is arranged at the lower end of the arc extinguish chamber, the static contact assembly comprises a static contact, the static contact is composed of a front end U-shaped part 210 and a tail connecting part, the upper end face of the front end U-shaped part is provided with a static contact point, the tail connecting part is provided with an arc striking angle, and the arc striking angle is arranged towards the static contact point. Through the technical scheme of increasing magnetic field arc striking, arc extinguishing grid sheet equidistant arc striking, air blowing arc blowing and the like, the arc can quickly move to the arc extinguishing device, and the arc extinguishing effect is improved.

The utility model discloses an electromagnetic relay, including base, contact part and permanent magnet, contact part includes the static spring part of installation in base to and the dynamic spring part of cooperation with static spring part, permanent magnet is located contact part outside, and can guide the electric arc of contact part break and produce to the preset direction, base is equipped with the recess of avoidance on the movement path of electric arc, to provide the avoidance space for electric arc when electric arc produces, the utility model discloses utilize the recess of avoidance to provide the avoidance space for electric arc, greatly reduced the ablation degree of electric arc to base, reduced the failure and failure risk of the trouble of the insulation performance decline of base because of the ablation of electric arc, ensured the stability and reliability of relay in long -term operation.

The utility model belongs to the technical field of low-voltage electric appliances, and discloses a contact arc extinguishing device and a circuit breaker. The contact arc extinguishing device comprises a static contact, a magnetic conductive member and a first arc striking angle. The static contact comprises a static conductive plate; the first arc striking angle is arranged on the magnetic conductive piece and forms a clamping groove with the magnetic conductive piece through bending, and the static conductive plate is clamped in the clamping groove. The first arc striking angle of the contact arc extinguishing device is connected with the static conductive plate through the clamping groove formed by the first arc striking angle and the magnetic conductive piece, so that the connection reliability between the first arc striking angle and the static contact is improved, and the arc extinguishing performance of the circuit breaker is further improved.

The utility model discloses a gas insulation spark gap overvoltage suppressor relates to voltage suppressor technical field, including suppressor, the one end of suppressor is fixedly connected with the inner station line, and the other end of suppressor is fixedly connected with the outer station line, and the inner station line and the outer station line are far apart and are connected with the high temperature -resistant non -conducting connecting sleeve through thread connection, and two connecting sleeves are far apart and are connected with the metal end through thread connection, in the utility model, through the cooperation between connecting chamber, arc extinguishing chamber and first arc splitting plate, arc extinguishing block, second arc splitting plate, have played the role of arc splitting, lengthening arc extinguishing to arc, have solved the problem that arc sustained existence of overvoltage generation is easy to break down equipment, have improved arc extinguishing efficiency and equipment's safety protection performance, through the cooperation between connecting sleeve, metal cover, rubber block, conducting block and inner station line, outer station line, metal end, have solved the problem that high temperature leads to the loosening of conducting part and the poor connection contact, have improved the stability of installation and the reliability of conduction.

The utility model belongs to the field of circuit breakers, and particularly relates to a miniature circuit breaker, which comprises a shell, an operating mechanism, a moving contact, a static contact, an arc extinguish chamber, a first wiring terminal, a second wiring terminal and an electromagnetic tripping mechanism, the electromagnetic tripping mechanism comprises a magnet yoke, an armature and a torsion spring, the magnet yoke is arranged in the shell, the armature is rotatably arranged on the magnet yoke, and the torsion spring is arranged in the shell. An iron core sheet is arranged between the magnet yoke and the wiring straight plate part, one end of the magnet yoke, corresponding to two sides of the accommodating groove, is vertically bent to form two strip-shaped attraction parts matched with the armature, and one end of the armature is provided with a square attraction part attracted with the two strip-shaped attraction parts; the electromagnetic tripping mechanism adopts a clapping type structural design and can meet the use requirement of a large-current miniature circuit breaker, the magnet yoke adopts a symmetrical magnetic circuit design, magnetic leakage is avoided, a concentrated magnetic field acts on the armature, and the attraction area of the magnet yoke and the armature can be increased, so that the attraction force of the magnet yoke to the armature is stronger, and the tripping action of the armature is more sensitive.