261results about "Contact surface shape/structure" patented technology

The invention discloses a CuCr contact and a preparation method thereof, and belongs to the field of alloy contact manufacturing, the CuCr contact is divided into an arc contact area, a transition area and a conductive connection area, and the Cr content of each area is in gradient distribution and is sequentially reduced, so that interface stress concentration can be avoided, and the structural compatibility and mechanical reliability of the whole contact are improved; meanwhile, integrated forming is achieved through the 3D printing technology, the size and the component boundary of each area can be accurately controlled, the complex structure design requirement of the contact is met, and the problems that in the prior art, performance gradient cannot be achieved according to the function requirements of different parts of the contact, and the material utilization rate is low are solved; the printed contact does not have the phenomena of composition segregation, agglomeration, uneven pores and the like, and the problems that in the prior art, Cr elements are difficult to distribute uniformly in a Cu matrix, Cr particles are prone to segregation and agglomeration, local ablation resistance is insufficient, and burning resistance is low are solved.

A unit pole of a double-breakpoint switch belongs to the technical field of low-voltage electric appliances. Comprising a shell, static contacts, a bridge-type moving contact, an arc extinguish chamber and a rotating shaft, the static contacts, the bridge-type moving contact, the arc extinguish chamber and the rotating shaft are located in the shell, the bridge-type moving contact is installed in the rotating shaft and comprises a pair of moving contact arms which extend out of the rotating shaft in a back-to-back mode, the static contacts are in a flat plate shape and are arranged on the top wall and the bottom wall in the shell respectively, and the arc extinguish chamber is arranged in the shell. The arc extinguish chambers are arranged in the shell and are in contact fit with the movable contact arms respectively, the movable contact arms form a < shape when making contact with the static contact, and the arc extinguish chambers are located on the left side and the right side in the shell respectively. The arc extinguish chamber has the advantages that the space occupied by the static contact in the shell is reduced, so that the space for placing the arc extinguish chamber can be increased, the arc extinguish chamber can obtain a larger space in the array direction of the grid sheets, more grid sheets can be stacked, the arc voltage can be improved, and the arc can be extinguished quickly; and meanwhile, the requirement of high-voltage breaking is met.

The present application provides a contact comprising: a first contact member formed of a tungsten-containing material, the first contact member having an exposed surface and a first groove open to the exposed surface, the first groove having a surrounding sidewall and a bottom wall defining an interior of the first groove; a first metal layer on a bottom wall of the first recess and having a top surface below the exposed surface of the first contact member; a liquid metal layer formed of a material containing a gallium indium tin alloy, located only on the top surface of the first metal layer and extending over the exposed surface of the first contact member, and the liquid metal layer is compliant and displaced by pressure applied to the liquid metal layer, and return to the initial shape in response to removal of the pressure on the liquid metal layer.

The invention relates to the technical field of low-voltage electric appliances, in particular to a contact module and a novel rotary disconnecting switch, and the contact module comprises an installation housing with an installation cavity, and the installation housing is rotatably connected with a rotary installation disc; the 2N arc extinguish chambers are connected with the mounting shell, and the arc extinguish chambers are positioned in the mounting cavity; the 2N static contacts are connected with the mounting shell, the static contacts and the arc extinguish chambers are alternately distributed around the circumferential direction of the rotary mounting disc, and one end of each static contact extends into the mounting cavity; the N static contacts are embedded in the rotating mounting disc, the N moving contacts are embedded in the rotating mounting disc, an insulating block is arranged between every two adjacent moving contacts, and the rotating mounting disc rotates to enable the two ends of each moving contact to abut against the two corresponding static contacts respectively; wherein N is a positive integer and is not less than 2; the rotary isolation switch has the effect of reducing the space occupancy rate of the rotary isolation switch in the inverter system.

The utility model relates to a high-voltage direct-current deicing isolating switch, which is structurally characterized in that a 550KV post insulator and a 35KV post insulator are parallelly arranged at the top of a base, a grading ring is arranged at the top of the 550KV post insulator, a static contact is arranged on the grading ring, and a main knife switch with a bending structure is arranged between the 35KV post insulator and the static contact; a bending control mechanism is arranged at the bottom of the main knife switch; an electric operating mechanism at the bottom of the base is connected with the bending control mechanism through an operating rod; and after the main knife switch is unfolded, the contact plate at the top is plugged with the static contact. According to the structure of the high-voltage direct-current ice-melting isolating switch, the conductive section of the conductive tube is increased, and the through-current capability of a product is improved; the main knife switch adopts a bending structure and has the characteristics of flexible rotation and strong corrosion resistance; the structure of the product is simplified, the later maintenance is facilitated, the maintenance period is prolonged, and the stability of switching-off and switching-on operation after the product runs for many years is ensured.

The invention relates to an actuator-sensor device (1) which has at least one upper membrane (2), wherein at least one actuator electrode having a signal input, and at least one unoccupied region in the form of a through-gap, are arranged on the at least one upper membrane (2). The device has at least one central membrane (3), wherein the at least one central membrane (3) has at least one hole-like opening (4). Furthermore, the device (1) has at least one lower membrane (5), wherein at least one actuator electrode having a signal input, and at least one unoccupied region in the form of a through-gap, are arranged on the at least one lower membrane (5). Finally, the device (1) has at least one upper sensor electrode (6) having a head and having a supply line with a signal output, wherein the head of the at least one upper sensor electrode (6) and the supply line of the at least one upper sensor electrode (6) are arranged in the at least one unoccupied region, in the form of a through-gap, of the at least one upper membrane (2), and at least one lower sensor electrode (7) having a head and having a supply line with a signal output, wherein the head of the at least one lower sensor electrode (7) and the supply line of the at least one lower sensor electrode (7) are arranged in the at least one unoccupied region, in the form of a through-gap, of the at least one lower membrane (5).

The utility model relates to the technical field of reed switches, in particular to a stable and reliable high-voltage-resistant high-power multi-point contact type reed switch. The stable and reliable high-voltage-resistant high-power multi-point contact type reed switch comprises a glass tube, a moving plate fixing rod, a beryllium copper straight elastic piece, a silver contact point, a riveting bolt, a contact point contact piece, a contact lower straight elastic piece and a fixing piece, the glass tube serves as a main body of the reed switch and is of a tubular structure, the glass tube is in a closed state, and the moving plate fixing rod and the silver contact point are fixed through the fixing piece. The glass tube is filled with inert gas, one end of the moving plate fixing rod is fixed to the left side in the glass tube, the fixing plate is fixedly installed on the right side in the glass tube, and the copper-plated straight elastic piece is installed at the right end of the moving plate fixing rod through a riveting bolt. The multi-point contact design of the silver contact point and the contact lower straight elastic sheet and the contact point contact sheet and the fixed sheet is adopted, a stable conduction circuit is formed under the action of a magnetic field, the contact reliability of the reed switch under various working conditions is greatly improved, and the risk of poor contact or open circuit is reduced.

The utility model discloses a durable composite contact, which comprises a base body, a first rectangular space is arranged in the lower surface of the base body, a second rectangular space is arranged in the top wall of the first rectangular space, a rectangular moving block can be just clamped in the second rectangular space, a contact is fixedly arranged at the upper part of the rectangular block, and the lower part of the base body is provided with a second rectangular space. A contact layer which penetrates through the top wall of the second rectangular space, extends out and is slidably connected to the base body is arranged at the upper end of the contact, a fixing plate is arranged on the top wall of the first rectangular space, a bolt penetrates through and is rotatably connected to the fixing plate, and the fixing plate is in direct threaded connection with a moving block through the bolt; the up-down movement of the moving block can be limited, so that the contact layer is prevented from shaking due to vibration; and meanwhile, rotation of the bolt is limited through the clamping block, so that the condition that the contact layer deviates due to wrong rotation of the bolt is avoided, and the stability of the contact layer is ensured.

The utility model discloses an electric leakage test detection loop and a release, and belongs to the technical field of low-voltage electric appliances. The electric leakage test detection loop comprises a first connecting piece and a first torsion spring, wherein the first torsion spring is connected with the first connecting piece; a first breakpoint is formed between the second torsional spring and the first connecting piece, and the second torsional spring can abut against the first connecting piece; the first torsional spring and the second connecting piece are second breakpoints, and the first torsional spring can abut against the second connecting piece; one end, deviating from the first connector, of the second torsion spring is connected with the third connector; one end of the second connecting piece away from the first torsion spring is connected with the circuit board. One end of the third connecting piece away from the second torsion spring is connected with the circuit board. The first torsion spring and the second torsion spring are arranged on the outer side of the release shell, so that the space in the release shell is saved, the purpose of reducing the design space of the electric leakage release is achieved, and the dielectric property of a product is improved. And by arranging the two breakpoints, mistaken touch of an operator is avoided, and high stability and reliability are achieved.

The utility model belongs to the technical field of power supplies, and particularly relates to a direct-current voltage-stabilizing and current-stabilizing power supply which comprises a direct-current voltage-stabilizing and current-stabilizing power supply body, a plurality of air inlet cylinders are communicated with the left wall of the direct-current voltage-stabilizing and current-stabilizing power supply body, and a plurality of air outlet cylinders are communicated with the right wall of the direct-current voltage-stabilizing and current-stabilizing power supply body. A pair of limiting plates is fixedly arranged on the left side wall face and the right side wall face of the direct-current voltage and current stabilization power source respectively, a polished rod is fixedly arranged between the limiting plates, a plurality of sliding blocks are arranged on the polished rod in a sliding mode, a lead screw is rotationally arranged between the limiting plates, the lead screw is in threaded connection with the sliding blocks, and dustproof plates are fixedly arranged on the bottom faces of the sliding blocks. According to the utility model, through reverse translation of the plurality of slide blocks, the dustproof plate can be driven to shield the air inlet cylinder and the air outlet cylinder, so that external dust is prevented from entering the DC voltage-stabilizing and current-stabilizing power supply main body through the air inlet hole or the air outlet hole when the DC voltage-stabilizing and current-stabilizing power supply main body is in an idle state; and the frequency of cleaning the interior of the DC voltage-stabilizing and current-stabilizing power supply main body by workers is reduced.

A mobile contact (20) is provided for an electric current switching device (50), comprising:a first conductor blade (1) and a second conductor blade (2), extending in planes (P1, P2) parallel to each other and distant from each other, the conductor blades (1, 2) being linked in rotation about a common rotational axis (R),a first and a second spacer (3, 4) configured to maintain a minimum distance between the first blade (1) and the second blade (2),in whicha cross section (S1, S2) of each blade (1, 2) is shaped so as to:have an area equal to the area of a reference cross section (S1′, S2′) of rectangular shape and of the same length (a), andhave a quadratic moment greater than the quadratic moment of the reference cross section (S1′, S2′), the quadratic moment being determined in relation to an axis parallel to the transverse axis (T1, T2) of the blades (1, 2).

The invention discloses a static contact assembly and an isolating switch, and relates to the field of electrical equipment. The static contact assembly comprises a supporting piece, a first static contact piece and a second static contact piece, the first static contact piece and the second static contact piece are arranged on the supporting piece in a mutually spaced mode, and a clamping space used for clamping the movable contact piece is formed between the first static contact piece and the second static contact piece. The static contact assembly comprises the first static contact piece and the second static contact piece which are arranged at an interval, so that the static contact assembly can clamp the moving contact piece through the first static contact piece and the second static contact piece to ensure that the static contact assembly and the moving contact piece have a better contact effect and are not easily interfered by vibration and the like; and the problem of poor contact easily occurring in the prior art is improved. The disconnecting switch comprises the moving contact and the static contact assembly, and therefore the disconnecting switch has the advantage of being good in contact effect.

The utility model discloses a composite contact convenient to recycle, which comprises a base body, a spherical groove is arranged in the upper surface of the base body, the bottom of the spherical groove is communicated with a contact hole positioned in the base body, the inner wall of the contact hole is provided with a conducting strip which is connected with the base body into a whole and has bending performance, and the conducting strip is provided with a plurality of grooves. A contact hole is formed in the base body, a composite sheet which penetrates through the contact hole and abuts against the inner wall of the contact hole is clamped between the conducting sheets, a spherical protruding part is arranged on the composite sheet, the protruding part is matched with the spherical groove in shape, the protruding part is attached to the spherical groove, and by arranging the contact hole and the conducting sheets, the contact area between the base body and the composite sheet is increased; the conductivity is enhanced, the stable contact between the composite sheet and the base body is ensured, and the connection between the composite sheet and the base body is not influenced by slight up-and-down movement; rapid connection between the composite sheet and the base body is achieved through the convex ring, the clamping ring and the rubber connecting ring, and assembly and disassembly can be achieved without tools.

The application belongs to the technical field of arc extinguishing chamber of circuit breaker, and relates to a double-acting arc extinguishing chamber, a switching-on and switching-off method and a circuit breaker. The double-acting arc extinguishing chamber comprises a moving contact, a static contact and a transmission mechanism. The static contact comprises a static support, a static arc contact and a static main contact. The moving contact comprises a moving main contact, a moving arc contact and a nozzle. The transmission mechanism comprises an upper driving rod, an upper elbow arm rod, a lower driving rod, a lower elbow arm rod, a rotating rod and a driving rod. One end of the upper driving rod is hingedly connected to the upper part of the nozzle, and the other end is hingedly connected to the upper end of the upper elbow arm rod. One end of the lower driving rod is hingedly connected to the lower part of the nozzle, and the other end is hingedly connected to the lower end of the lower elbow arm rod. The lower end of the upper elbow arm rod is hingedly connected to one end of the rotating rod, and the upper end of the lower elbow arm rod is hingedly connected to the other end of the rotating rod. The middle position of the rotating rod is hingedly connected to one end of the driving rod, and the other end of the driving rod is connected to the static arc contact. The problem of vibration caused by the instability of the linear motion of the static arc contact and the quick-return characteristic of the existing structure due to the unbalanced structure of the transmission rod is solved.

The utility model relates to a change-over switch, which comprises a base, a contact system, a driving mechanism and a cover plate arranged on the base, the cover plate covers the contact system and the driving mechanism, and the driving mechanism comprises a motor, a screw rod in linkage fit with the motor and a nut arranged on the screw rod. The contact system comprises a static contact seat arranged in the base, a plurality of static contacts respectively arranged on the static contact seat, a movable contact frame which is arranged in the base in a sliding manner and is in linkage fit with the nut, and a plurality of movable contacts which are arranged on the movable contact frame in a linkage manner and are matched with the plurality of static contacts; the moving contact comprises two moving contact pieces arranged in contact holes of the moving contact frame, a base plate arranged between the two moving contact pieces and two elastic pieces arranged between the two moving contact pieces and the moving contact frame respectively, and a contact clamping space matched with the static contact is formed between the two ends of the two moving contact pieces. The utility model has the advantages of simple structure, stable and reliable performance, good protection performance and long service life.

The embodiment of the invention provides a change-over switch, and relates to the technical field of switching devices. The change-over switch comprises a switch shell, a static contact structure and a moving contact structure, the static contact structure comprises two first static contacts and two second static contacts, and the moving contact structure comprises a sliding part, a first moving contact, a second moving contact and a third moving contact; the sliding part is used for sliding relative to the switch shell under the action of external force, so that the first moving contact is connected with the two first static contacts, the second moving contact is connected with the two second static contacts, and loops are connected in parallel to form a first voltage platform; or, the third moving contact is connected and conducted with one of the first static contacts and one of the second static contacts, so that the loops are connected in series to form a second voltage platform. According to the invention, different voltage platforms can be switched according to different charging scenes, so that the architecture of the charging system is simplified, the charging efficiency is improved, and the cost is reduced.

A movable contact (20) is proposed for an electrical current interruption device (50), comprising: - a first conducting knife (1) and a second conducting knife (2), extending from parallel planes (P1,P2) separated by a distance between them, the conducting knives (1,2) being rotationally linked about a common axis of rotation (R), - a first and second spacer (3,4) configured to maintain a minimum distance between the first knife (1) and the second knife (2), wherein a cross-section (S1,S2) of each knife (1,2) is shaped to: - have an area equal to the area of ​​a reference rectangular cross-section (S1',S2') of the same length (a), and - have a second moment of area greater than the second moment of area of ​​the reference cross-section (S1',S2'), the second moment of area being determined with respect to an axis parallel to the transverse axis (T1,T2) of the knives (1,2). Figure of the abstract: Figure 3

To provide a contact mechanism that can further suppress the electromagnetic repulsive force that may occur when current is applied. [Solution] A contact mechanism 100 according to one aspect of the present disclosure comprises a movable element 110, a first stator 120, a second stator 130, a connecting member 140 that connects the movable element 110 and the movable iron piece 150 and drives the movable element 110 with an electromagnet having a movable iron piece 150, and an auxiliary yoke 160 that is positioned inside the first stator 120 and the second stator 130 in a first direction and on the first surface side of the movable element 110, wherein the first stator 120 extends in the first direction from a first connection to a first fixed contact, the second stator 130 extends in the first direction from a second connection to a second fixed contact, and the movable element 110 is planar when viewed from the first direction at the location on the first surface corresponding to the location where the auxiliary yoke 160 is positioned.

A moving contact system of a switch belongs to the technical field of low-voltage apparatuses. Comprising a contact support, a contact piece and a contact cover, the contact piece is rotatably arranged on the contact support, the contact cover is located on the side, facing a static contact of a switch, of the contact piece, and the contact cover is clamped on the contact support through a lock catch connecting structure. The moving contact has the advantages that the contact cover of the moving contact is clamped on the contact support through the lock catch connecting structure, the assembly process is simplified, the assembly efficiency can be improved, and the assembly cost is reduced.

The invention discloses a multidirectional operation switch, a conductive structure provides an electrode, and when a conductive medium on the lower side surface of an elastic pad is in contact with an output pin of the conductive structure and an electrode pin beside the output pin, a corresponding signal circuit is connected with a working voltage. According to the multidirectional operation switch, the signal circuit can be printed on the multidirectional operation switch in the form of a printed circuit, and can also be fixed on the bottom plate for sealing the lower port of the shell, so that the existence form of the signal circuit is more flexible.

Systems, methods and apparatuses provide for technology that includes a motor, a trigger assembly including a trigger member and an elastomer member mechanically coupled to the trigger member and moveable along a movement axis, wherein the elastomer member includes an electrically-conductive non-planar surface, a controller configured to operate the motor, and a circuit board oriented substantially perpendicularly to the movement axis, the circuit board including a plurality of conductive tracks facing the non-planar surface coupled to a resistor divider, and wherein controller is configured to vary a speed of the motor based on a number of the plurality of conductive tracks contacted by the non-planar surface of the elastomer member. The elastomer member may include a non-planar surface having a conductive central region, a conductive peripheral region and an insulative region positioned between the conductive central region and the conductive peripheral region.

The utility model discloses an isolation switch, and the isolation switch is characterized in that a first switch unit layer is internally provided with a first contact system, and the first contact system comprises a moving contact assembly and at least one group of static contact assemblies; the static contact assembly comprises a static contact blade, a first elastic piece and a second elastic piece; the first elastic piece and the static contact piece are fixed to form a first clamping opening, the second elastic piece and the static contact piece are fixed to form a second clamping opening, and the first clamping opening and the second clamping opening are formed in the two sides of the static contact piece in the first direction respectively. The first movable contact piece and the second movable contact piece are arranged at an interval in the first direction; the first movable contact piece is matched with the first clamping opening, and the second movable contact piece is matched with the second clamping opening. The first movable contact piece and the second movable contact piece are rotationally arranged around the same axis, so that the first movable contact piece and the second movable contact piece form clamping with the first clamping opening and the second clamping opening at the same time or release clamping at the same time after rotating; the current-carrying capacitor has the characteristic of good current-carrying performance.

The invention relates to a three-position switch which comprises a three-position mechanism and a switch body, the switch body comprises a switch frame, an isolation shaft sleeve coupled to the switch frame and three movable contact knives fixedly connected to the isolation shaft sleeve, and the switch frame is fixedly connected with a grounding bar and a switch-on contact seat mounting cross beam. The grounding bar is fixedly connected with three grounding contact seats, the switch-on contact seat mounting cross beam is fixedly connected with three switch-on contact seats, the three-station mechanism drives the isolation shaft sleeve to rotate so as to enable the movable contact knife to swing between the grounding contact seats and the switch-on contact seats, the switch-on contact seat mounting cross beam is made of SMC (Sheet Molding Compound) casting molding, the molding time is short, and the molding efficiency is high. The cracking risk of the mounting cross beam caused by thermal expansion and cold contraction of the switch-on contact seat in the dynamic heat test process is reduced; a three-station mechanism is changed into an inner spring and an outer spring, so that the initial force value of opening is improved; and an output shaft shifting plate fixing hole is changed into a long circular hole, so that the torque applied to the position of the output shaft is increased, the initial force value of opening is further improved, and the success probability of a dynamic heat test is improved.

The invention discloses a hexogen-driven rapid protection closing switch and a closing method, and belongs to the technical field of special switches, the rapid protection closing switch is connected in parallel in a main loop of a superconducting magnet power supply system, and comprises a breaking structure unit and an auxiliary structure unit; the breaking structure unit comprises a hexogen grain, an insulating impact ring and an impact contact; during normal operation, the breaking structure unit and the auxiliary structure unit are in a breaking state; when a switching-on signal is received, the hexogen explosive column is detonated to push the insulating impact ring and the impact contact, the impact contact is embedded into the auxiliary structure unit, the breaking structure unit and the auxiliary structure unit form an effective path, the switching-on action is completed, and the switch structure is protected. According to the invention, by using a chemical energetic hexogen detonation closing structure, a conductive loop can be rapidly and reliably closed and through-flow, and the superconducting magnet can be prevented from being damaged. The contact surface of the closing switch contact adopts triangular concave-convex groove contact, so that the contact resistance after closing is reduced, and the through-current capability is improved.

An excitation closer capable of improving closing reliability comprises a shell with a cavity, a first conductor and a second conductor, the first conductor and the second conductor are arranged in the shell in a penetrating mode in an insulated and opposite spaced mode, an excitation source and a piston are arranged in the cavity of the shell, the piston is of a shell-shaped structure with one end open and one end closed, and at least the peripheral face of the piston is made of conductive materials. The open end of the piston faces the driving force release end of the excitation source, and the closed end of the piston is arranged corresponding to the relatively spaced ends of the first conductor and the second conductor; the excitation source can act according to a received trigger signal to release driving force to drive the piston to move towards the first conductor and the second conductor, so that the piston is clamped between the ends, oppositely arranged at intervals, of the first conductor and the second conductor in a plastic deformation mode, and the first conductor and the second conductor are conducted. According to the invention, the reliability of conduction between the first conductor and the second conductor is improved through the plastically deformed piston.

The invention discloses a vacuum switch for a flexible direct current system and a closing method, and relates to the technical field of vacuum switches. The static end assembly is arranged at one end of the insulating shell and comprises a static conducting rod, a static contact connected to the inner end of the static conducting rod and a static end cover connected with the insulating shell in a sealing manner; the moving end assembly is arranged at the other end of the insulating shell and comprises a moving conductive rod, a moving contact connected to the inner end of the moving conductive rod and a moving end cover connected with the insulating shell in a sealing manner; the sealing element is arranged between the movable conducting rod and the movable end cover; wherein one of the static contact and the moving contact is of a conical structure, and the other one of the static contact and the moving contact is of a conical nest structure matched with the conical structure. According to the vacuum switch, the problems of huge size, insufficient action speed and low closing reliability caused by huge electric repulsive force when a traditional vacuum switch closes extra-large short-circuit current of a flexible direct current system can be solved.

The invention discloses an environment-friendly inflatable cabinet and a use method, and belongs to the technical field of switch equipment. The environment-friendly inflatable cabinet comprises an inflatable part and a non-inflatable part; the inflating part comprises an upper inflating compartment and a lower inflating compartment; a three-station isolating switch is mounted in the upper inflation compartment, a vacuum circuit breaker is mounted in the lower inflation compartment, and the upper inflation compartment is communicated with the lower inflation compartment through an insulator; the three-station isolating switch comprises a switching-on contact, a middle static contact, a moving contact and a grounding contact; the moving contact can be controlled to be in contact with or disconnected from the connection contact by adjusting the left movement of the moving contact, and can be controlled to be in contact with or disconnected from the grounding contact by adjusting the right movement of the moving contact. According to the environment-friendly inflatable cabinet, the problems of uneven electric field distribution and insufficient creepage distance under a low-pressure N2 / dry air insulating medium are solved by optimizing the layout of the inflatable compartments and improving the design of the three-station isolating switch structure and the operating mechanism, and the environment-friendly requirement is met at the same time.

The utility model relates to a kind of low temperature-rise disconnecting switch, and the accommodation end supported by contact provides stable mounting position for movable contact, so that movable contact can be firmly fixed in shell, ensure the position accuracy of movable contact in working process, reduce the problem such as poor contact caused by movable contact shaking, movable contact uses integrally-formed main part, two ends respectively extend outward to form contact arm, simple and compact structure, reduce the number of parts, reduce manufacturing and assembly cost, also improve the overall strength and reliability of movable contact, wiring board is integrated straight contact plate, simple structure, large contact area, can provide good conductivity, reduce contact resistance, reduce temperature rise, and contact arm is provided with cylindrical contact point at one end close to wiring board, can increase the contact pressure between contact arm and wiring board, make contact more closely, to effectively reduce contact resistance.