Switching appliance

Abstract

The switch electric appliance comprises a shell, a contact support, a counterforce spring, a contact system and two electromagnetic systems, the two electromagnetic systems are oppositely arranged on two sides of the contact system, the two electromagnetic systems each comprise an upper armature and a coil for driving the upper armature to move, the upper armatures of the two electromagnetic systems are connected through a linkage shaft, the top side of the contact support is provided with a linkage groove, the linkage shaft is installed in the linkage groove, the two electromagnetic systems drive the contact support to move linearly against the action force of the counterforce spring through the linkage shaft, the contact support drives the moving contact to contact the static contact, and the contact support drives the moving contact to separate from the static contact under the action of the counterforce spring. The switch electric appliance has the advantages that the two electromagnetic systems are oppositely arranged on the two sides of the contact system, the height of the switch electric appliance is reduced, the contact support is connected with the two electromagnetic systems through the linkage groove arranged on the top side for accommodating the linkage shaft, the height space is not additionally occupied, and the contact support is convenient to disassemble and assemble.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a switching device. Background Technology

[0002] Existing contactors are commonly used in control circuits, but their electromagnetic and contact systems are vertically distributed, resulting in a relatively high contactor height. Excessive height can prevent installation in certain locations. Furthermore, the interconnected connection between the electromagnetic and contact system contacts in existing contactors adds to the installation inconvenience. Utility Model Content

[0003] The purpose of this utility model is to overcome at least one defect of the prior art and provide a switching electrical appliance.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A switching device includes a housing and a contact support, a return spring, a contact system, and two electromagnetic systems disposed within the housing. The two electromagnetic systems are disposed opposite each other on both sides of the contact system. Each electromagnetic system includes an upper armature and a coil for driving the upper armature to move. The upper armatures of the two electromagnetic systems are connected by a linkage shaft. The contact system includes a moving contact and a stationary contact disposed opposite each other. The moving contact is disposed on the contact support. The top side of the contact support has a linkage groove that mates with the linkage shaft. The linkage shaft is installed in the linkage groove. The two electromagnetic systems drive the contact support to move linearly against the force of the return spring through the linkage shaft, so that the contact support drives the moving contact to contact the stationary contact. Under the action of the return spring, the contact support drives the moving contact to separate from the stationary contact.

[0006] Optionally, the top side of the contact support is provided with a linkage bracket, and the linkage slot is provided on the top side of the linkage bracket.

[0007] Optionally, the housing includes a base and an arc-extinguishing shroud disposed on the top side of the base. The arc-extinguishing shroud is provided with a top cover. The contact system is disposed inside the arc-extinguishing shroud and the base. The arc-extinguishing shroud is provided with an arc-extinguishing mechanism. The top side of the base is provided with two protruding boss structures. The middle part of the two boss structures is provided with groove structures for accommodating the electromagnetic system.

[0008] Optionally, the groove structure has a notch near the side wall of the housing, and the housing has a side cover corresponding to the notch. The side cover is L-shaped, with one end of the side cover closing the top of the groove structure, and both sides of one end of the side cover extending outward to form a fixing part that covers the top side of the boss structure. The other end of the side cover closes the side notch of the groove structure.

[0009] Optionally, the contact system has multiple support structures, each with a moving contact. The multiple support structures are arranged sequentially along the length of the linkage shaft. The arc extinguishing cover has a partition between each of two adjacent support structures. The partition has a clearance groove on its side away from the base to avoid the linkage shaft. The linkage shaft passes through the space above the multiple support structures sequentially. The inlet and outlet ends of the contact system protrude from both ends of the partition along the length of the partition and from both ends of the base along the length of the base.

[0010] Optionally, the length of the partition is equal to the length of the base, wherein baffles are provided between the two ends of the length direction of two adjacent partitions, and the baffles are provided with exhaust holes;

[0011] And / or, the partition is provided with arc-blocking plates at both ends of its length direction, and the arc-blocking plates are arranged along the length direction of the partition.

[0012] Optionally, the two electromagnetic systems are arranged opposite each other on both sides of the contact support along a first direction, the coil is used to drive the upper armature to move along a second direction, and drive the contact support to move along a second direction, the inlet and outlet of the contact system are arranged along a third direction, and the first direction, the second direction and the third direction are arranged perpendicular to each other.

[0013] Optionally, the contact support has two stationary contacts on both sides, which serve as the inlet and outlet of the contact system, respectively. The two stationary contacts are arranged along a third direction, and the contact support is used to drive the moving contact to simultaneously contact and separate from the stationary contacts at both ends.

[0014] Optionally, the moving contact has arc-extinguishing structures at both ends in the third direction, each arc-extinguishing structure comprising a plurality of spaced-apart arc-extinguishing grids; the moving contact has a first arc-inducing element and a second arc-inducing element at both ends in the third direction, with the corresponding arc-extinguishing structure located between the first and second arc-inducing elements, the first arc-inducing element located on the side of the arc-extinguishing structure near the moving contact, and the second arc-inducing element located on the side of the arc-extinguishing structure away from the moving contact; the bottom side of the second arc-inducing element extends toward the stationary contact point of the stationary contact and has an arc-inducing portion, which is connected to the side of the stationary contact where the stationary contact point is located.

[0015] Optionally, the arc-leading part is a U-shaped structure, including a top side and a bottom side of the arc-leading part, and a closed side connected between the top side and the bottom side of the arc-leading part and opposite to the opening. The arc-leading part has a clearance notch at the end away from the opening to avoid the stationary contact. The bottom side of the arc-leading part is stacked and fixed on the side of the stationary contact on the stationary contact.

[0016] Optionally, the first arc-inducing component is a U-shaped structure, and the top sides of the two first arc-inducing components at both ends of each moving contact are connected by a connecting plate.

[0017] Optionally, the electromagnetic system further includes a lower armature and a coil frame. The upper armature and the lower armature are arranged opposite each other along a second direction. The coil frame is disposed between the upper armature and the lower armature. The coil is disposed outside the coil frame. The contact support and the reaction spring are arranged along the second direction. The coil is used to drive the upper armature to move in the direction of the lower armature, so that the upper armature drives the contact support to move in the direction of the reaction spring through the linkage shaft. The reaction spring is used to drive the contact support to move away from the reaction spring.

[0018] Optionally, the electromagnetic system further includes an upper armature housing, which at least covers the top of the upper armature, and the linkage shaft passes through the upper armature housing and is connected to the portion of the upper armature located inside the upper armature housing.

[0019] Optionally, the upper armature cover also cooperates with the auxiliary side-mounted drive. When the upper armature moves in the direction of the lower armature, it can drive the upper armature cover to drive the auxiliary side-mounted drive.

[0020] Optionally, a contact heat insulation plate is provided between the moving contact and the contact support;

[0021] And / or, the moving contact has a multi-layer plate structure, including a magnetic plate.

[0022] This utility model of a switchgear, by arranging two electromagnetic systems opposite each other on both sides of a contact system, provides a large and stable driving force capable of driving one or more sets of moving contacts. The electromagnetic system and the contact system occupy the same height space, reducing the height of the switchgear. It can be used in locations where the original height cannot accommodate the contactor. Moreover, the contact support achieves linkage with the two electromagnetic systems through a linkage groove on the top side for accommodating the linkage shaft, without occupying additional height space. During installation, the two electromagnetic systems and the linkage shaft can be assembled into one unit and then installed into the housing, so that the linkage shaft between the two electromagnetic systems is synchronously placed in the linkage groove on the top side of the contact support, making disassembly and assembly convenient and facilitating automated installation.

[0023] In addition, the side cover is used to both close the groove structure and cover the boss structure, simplifying the structure and making it easy to disassemble and assemble.

[0024] In addition, the two terminal blocks, which serve as the inlet and outlet terminals, extend to both sides of the housing along its length, allowing for direct connection to other devices and avoiding complicated wiring operations.

[0025] In addition, the upper armature cover reduces friction between the upper armature and the side cover of the housing, giving the upper armature better operating characteristics. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the switching device of this utility model in the energized state;

[0027] Figure 2 This is a cross-sectional view of the switching device under short circuit conditions of this utility model, showing the maximum contact opening distance;

[0028] Figure 3 This is an assembly drawing of the contact support, moving contact, and buffer mechanism of this utility model;

[0029] Figure 4 This is an exploded view of the contact support, moving contact, and buffer mechanism of this utility model;

[0030] Figure 5 This is a cross-sectional view of the switching device under power-off conditions, showing the electromagnetic system and contact support;

[0031] Figure 6 This is a schematic diagram of the electromagnetic system and contact support of this utility model;

[0032] Figure 7 This is an assembly drawing of the switch electrical appliance of this utility model.

[0033] Figure 8 This is an exploded view of the switch electrical appliance of this utility model;

[0034] Figure 9 This is a schematic diagram of the arc-extinguishing structure, contact system, contact support, and electromagnetic system of this utility model;

[0035] Figure 10 This is a cross-sectional view of the switchgear and auxiliary side mount of this utility model.

[0036] Contact support 1; Contact spring 10; Contact support base plate 11; Buffer groove 111; Blocking protrusion 112; First reinforcing plate 113; Second reinforcing plate 114; Sealing plate 12; First side plate 13; Slide groove 131; Fixing groove 132; Second side plate 14; Top plate 15; Linkage bracket 16; Linkage groove 161; Fixing protrusion 162; Contact heat insulation plate 17; Heat dissipation groove 171; Limiting flange 172; Reaction spring 2; Contact system 300; Moving contact 3; Limiting groove 31; Magnetic plate 32; Stationary contact 4; Stationary contact plate 40; Stationary contact block 41; Buffer mechanism 5; Limiting element 51; Extension 511; Spring limiting groove; Limiting protrusion 512; Buffer 52. Spring; 6. Pressing structure; 61. Spring bracket side; 62. Spring bracket bottom; 63. Pressure rod; 71. Base; 711. Stop part; 72. Arc extinguishing cover; 721. Partition plate; 722. Baffle plate; 723. First slot; 724. Second slot; 725. Top cover; 73. Boss structure; 74. Groove structure; 75. Side cover; 76. Fixing part; 761. Electromagnetic system; 8. Linkage shaft; 80. Upper armature; 81. Horizontal part; 811. Vertical part; 812. Coil; 82. Lower armature; 83. Coil frame; 84. Upper armature cover; 85. Auxiliary side hanger; 91. Arc extinguishing structure; 92. First arc ignition element; 921. Connecting plate; 93. Second arc ignition element; 931. Detailed Implementation

[0037] The specific embodiments of the switching device of this utility model are further described below with reference to the accompanying drawings. The switching device of this utility model is not limited to the description of the following embodiments.

[0038] like Figure 1 , Figure 5 and Figure 8 As shown, the switching device of this embodiment includes a housing and a contact support 1, a reaction spring 2, a contact system 300, and two electromagnetic systems 8 disposed within the housing. The two electromagnetic systems 8 are disposed opposite each other on both sides of the contact system 300. Each electromagnetic system 8 includes an upper armature 81 and a coil 82 for driving the upper armature 81 to move. The upper armatures 81 of the two electromagnetic systems 8 are connected by a linkage shaft 80. The contact system 300 includes a moving contact 3 and a stationary contact 4 disposed opposite each other. The moving contact 3 is disposed on the contact support 1. The contact support 1 is linearly movable within the housing. The top side of the contact support 1 is provided with a linkage groove 161 that cooperates with the linkage shaft 80. The linkage shaft 80 is installed in the linkage groove 161. The upper armature 81 is connected to the contact support 1 through the linkage shaft 80 and is used to drive the contact support 1 to move the moving contact 3 toward the stationary contact 4. The reaction spring 2 is connected to the contact support 1 and is used to drive the contact support 1 to reset, that is, the contact support 1 drives the moving contact 3 to move away from the stationary contact 4. like Figure 1As shown, when coil 82 is energized, the upper armature 81 of the two electromagnetic systems 8, driven by electromagnetic force, drives the contact support 1 to move downward against the force of the reaction spring 2 via the linkage shaft 80, causing the contact support 1 to drive the moving contact 3 to contact the stationary contact 4; Reference Figure 2 When coil 82 is de-energized, contact support 1, under the action of reaction spring 2, causes moving contact 3 to separate from stationary contact 4.

[0039] In this embodiment, the switching device has two electromagnetic systems 8 arranged opposite each other on both sides of the contact system 300. The driving force is large and stable, which can drive one or more sets of moving contacts 3. The electromagnetic system 8 and the contact system 300 occupy the same height space, reducing the height of the switching device. It can be used in positions where the original height cannot be used to install the contactor. Moreover, the contact support 1 is linked with the two electromagnetic systems 8 by having a linkage groove 161 on the top side for accommodating the linkage shaft 80. It does not occupy additional height space. During installation, the two electromagnetic systems 8 and the linkage shaft 80 can be assembled into one piece and then installed into the housing. The linkage shaft 80 between the two electromagnetic systems 8 is placed synchronously in the linkage groove 161 on the top side of the contact support 1. The disassembly and assembly are convenient and facilitate automated installation.

[0040] like Figure 1 , Figure 7 and Figure 8 As shown, the two electromagnetic systems 8 are arranged opposite each other on both sides of the contact support 1 along a first direction. The coil 82 is used to drive the upper armature 81 to move along a second direction, and to drive the contact support 1 to move along the second direction. The inlet and outlet ends of the contact system 300 are arranged along a third direction, and the first, second, and third directions are arranged perpendicular to each other. The internal mechanism layout is reasonable, the structure is compact, and the size is small. The first direction is... Figure 7 The X direction, which is the width direction of the switchgear, and the second direction are... Figure 7 The Y-direction, which is the height direction of the switchgear, and the third direction are... Figure 7 The Z-direction, which is the length direction of the switch, is used for wiring at both ends of the switch along its length.

[0041] Furthermore, the contact support 1 has two stationary contacts 4 on both sides, serving as the inlet and outlet terminals of the contact system 300, respectively. The two stationary contacts 4 are arranged along a third direction. The contact support 1 is used to drive the moving contact 3 to simultaneously contact and separate from the stationary contacts 4 at both ends, further improving the rationality of the layout. In this embodiment, the two stationary contacts 4 each include a stationary contact plate 40, a stationary contact block 41, and a stationary contact point that cooperates with the moving contact 3. One end of the stationary contact plate 40 is used for wiring, and the stationary contact block 41 is disposed on the top side of the other end of the stationary contact plate 40. The stationary contact point is disposed on the top side of the stationary contact block 41. In this embodiment, the stationary contact plates 40 of the two stationary contacts 4 serve as the inlet and outlet terminals of the contact system 300, respectively, and are separately arranged from the stationary contact block 41. The stationary contact plates 40 and the stationary contact block 41 of the stationary contacts 4 can be welded or fastened together, or indirectly connected through a conductor. Of course, in other embodiments, the stationary contact plates 40 and the stationary contact block 41 of the stationary contacts 4 can also be integrally connected.

[0042] like Figure 7 and Figure 8 As shown, the housing in this embodiment includes a base 71 and an arc-extinguishing cover 72 disposed on the top side of the base 71. A top cover 73 is provided above the arc-extinguishing cover 72. The contact system 300 is disposed inside the arc-extinguishing cover 72 and the base 71. An arc-extinguishing mechanism is provided in the arc-extinguishing cover 72. Two protruding boss structures 74 are provided on the top side of the base 71. The middle part of the two boss structures 74 is respectively provided with a groove structure 75 for accommodating the electromagnetic system 8. The electromagnetic system 8 is installed in the groove structure 75. Preferably, the groove structure 75 has a notch near the side wall of the housing, and the housing has a side cover 76 corresponding to the notch, which is used to protect the electromagnetic system 8 and also facilitates the replacement of the electromagnetic system 8. In this embodiment, the side cover 76 is L-shaped, with one end of the side cover 76 closing the top of the groove structure 75, and both sides of one end of the side cover 76 extending outward to form a fixing part 761 that covers the top side of the boss structure 74. The fixing part 761 of the side cover 76 is fastened to the boss structure 74 or connected by other means. The other end of the side cover 76 closes the side notch of the groove structure 75. The side cover 76 is used to both close the groove structure 75 and cover the boss structure 74, simplifying the structure and facilitating disassembly and assembly. The two boss structures 74 are arranged opposite each other on both sides of the arc-extinguishing cover 72, and the height of the boss structure 74 is preferably equal to the height of the arc-extinguishing cover 72, so that the top side of the fixing part 761 of the side cover 76 is flush with the top cover 73, making the shape of the switch more regular. Of course, the height of the boss structure 74 can also be less than or greater than the height of the arc-extinguishing shield 72. Furthermore, the bottom side of the base 71 is provided with a bottom cover, and the reaction spring 2 is connected to the contact support 1 and is located between the base 71 and the bottom cover.

[0043] like Figure 1 and Figure 4As shown, the switching device in this embodiment further includes at least one buffer mechanism 5, which is mounted on the contact support 1. The buffer mechanism 5 includes a limiting member 51 and a buffer spring 52. A buffer groove 111 is provided on the contact support 1, and the limiting member 51 and the buffer spring 52 are installed in the buffer groove 111. The limiting member 51 confines the buffer spring 52 within the buffer groove 111, and the limiting member 51 has a protruding portion 511. The buffer spring 52 drives the limiting member 51 to extend outward. Part 511 extends out of buffer groove 111; the housing is provided with a stop part 711 corresponding to the extension part 511. The stop part 711 is located on the movement path of the extension part 511 when the contact support 1 drives the moving contact 3 to move away from the stationary contact 4. When the contact support 1 drives the moving contact 3 to move away from the stationary contact 4, the stop part 711 blocks the extension part 511. The extension part 511 can overcome the force of the buffer spring 52 and move in the direction of retracting into buffer groove 111.

[0044] By adopting the above structure, when the moving contact 3 separates from the stationary contact 4, if the force driving the moving contact 3 to separate is different, the distance by which the compressed extension 511 retracts into the buffer groove 111 (i.e., the compression distance of the buffer spring 52) will be different, thus the opening distance between the moving contact 3 and the stationary contact 4 is variable. For example, when the switchgear is normally open, when the contact support 1 drives the moving contact 3 to separate from the stationary contact 4 under the action of the reaction spring 2, the extension 511 of the limiting member 51 just contacts the stop part 711. At this time, since the contact support 1 is balanced under the opposite action of the reaction spring 2 and the buffer spring 52, that is, the force of the reaction spring 2 acting on the contact support 1 is equal to the force of the buffer spring 52 acting on the stop part 711, the extension 511 will not retract into the buffer groove 111 or will retract slightly into the buffer groove 111. When the circuit breaker trips during a short circuit fault, the contact support 1, under the action of the reaction spring 2 and the electric repulsion force, causes the moving contact 3 to separate from the stationary contact 4. The stop part 711 blocks the protruding part 511, which can cause part or all of the protruding part 511 to retract into the buffer groove 111.

[0045] refer to Figure 2When the switchgear is normally open, the coil 82 is de-energized, the upper armature 81 of the electromagnetic system 8 loses its electromagnetic force, and the contact support 1, under the action of the reaction spring 2, drives the moving contact 3 to move upward, separating the moving contact 3 from the stationary contact 4. Simultaneously, the contact support 1 drives the buffer mechanism 5 to move towards the stop 711, and the protruding part 511 of the limiting member 51 just contacts the stop 711. At this time, the coil 82 enters the de-energized state. Because the contact support 1 remains balanced under the opposite action of the reaction spring 2 and the buffer spring 52, i.e., the reaction spring... 2. The force acting on the contact support 1 is equal to the force acting on the stop 711 by the buffer spring 52, so the extension 511 of the limiting member 51 will not retract into the buffer groove 111 or will retract slightly into the buffer groove 111. At this time, the distance between the moving contact 3 and the stationary contact 4 is the first opening distance, also known as the balanced opening distance. When the first opening distance is small, the opening distance between the moving contact 3 and the stationary contact 4 is relatively small. When performing the closing operation, the electromagnetic system 8 only needs to drive the contact support 1 to move downward by the first opening distance to achieve closing, thus realizing the rapid closing of the switchgear.

[0046] like Figure 1 As shown, when the switch is closed, the coil 82 is energized. Under the drive of electromagnetic force, the upper armature 81 of the electromagnetic system 8 drives the contact support 1 to move downward against the force of the reaction spring 2, so that the contact support 1 drives the moving contact 3 to contact the stationary contact 4. The contact support 1 simultaneously drives the buffer mechanism 5 to move away from the stop part 711, and the extension part 511 of the limiting member 51 separates from the stop part 711.

[0047] like Figure 2As shown, when a short circuit fault occurs in the switching device, a huge short-circuit current flows through the moving contact 3 and the stationary contact 4, generating an electric repulsive force. This causes the moving contact 3 to move rapidly upwards and separate from the stationary contact 4. At this time, the electromagnetic system 8 also loses power, and the reaction spring 2 drives the contact support 1 to move the moving contact 3 upwards. The buffer mechanism 5 moves with the contact support 1 towards the stop 711, causing the extension 511 of the limiting member 51 to contact the stop 711. Under the combined action of the electric repulsive force and the reaction spring 2, the limiting member... The protruding part 511 of the stop member 51, under the blocking action of the stop part 711, overcomes the force of the buffer spring 52 and retracts partially or completely into the buffer groove 111. At this time, the distance between the moving contact 3 and the stationary contact 4 is the second opening distance. The opening distance between the moving contact 3 and the stationary contact 4 is the largest when the protruding part 511 of the stop member 51 is completely retracted into the buffer groove 111, that is, when the contact support 1 can no longer move upward. The second opening distance is equal to the first opening distance plus the compression distance of the buffer spring 52. This can increase the opening distance of the switchgear during short circuit and reduce the risk of arc reignition. After the electric repulsion disappears, the reaction spring 2 and the buffer spring 52 return to the equilibrium state, and the distance between the moving contact 3 and the stationary contact 4 returns to the first opening distance. The buffer spring 52 is confined within the buffer groove 111 of the contact support 1 by the limiting member 51 of the buffer mechanism 5, thereby increasing the variable opening distance (i.e., the compression distance of the buffer spring 52 of the buffer mechanism 5), thus improving the breaking distance of the switchgear during short circuit to enhance its breaking capacity. At the same time, it does not increase the opening distance during closing operation, enabling rapid closing. Furthermore, the buffer mechanism 5 and the contact support 1 are integrated into one unit, which is conducive to miniaturization and modular design, easy installation, compact setting, and reduced size.

[0048] like Figure 3-5 As shown, the contact support 1 in this embodiment includes a contact support base plate 11 and at least one support structure for mounting the moving contact 3. The support structure and the buffer groove 111 for accommodating the buffer mechanism 5 are respectively disposed on the top side of the contact support base plate 11. The reaction spring 2 is disposed on the bottom side of the contact support base plate 11. A spring limiting boss is provided on the bottom side of the contact support base plate 11. The spring limiting boss is annular. One end of the reaction spring 2 abuts against the spring limiting boss, and the other end abuts against the housing.

[0049] like Figure 1-4As shown, the contact support base plate 11 of the contact support 1 has a through-hole structure. A sealing plate 12 is mounted on the bottom side of the contact support base plate 11. The sealing plate 12 closes the bottom opening of the through-hole structure to form the buffer groove 111, that is, the sealing plate 12 serves as the bottom wall of the buffer groove 111. The limiting member 51 and the buffer spring 52 are inserted into the buffer groove 111 from the side where the sealing plate 12 is installed. Then, the sealing plate 12 is fixedly connected to the contact support 1, and the buffer mechanism 5 is installed in the buffer groove 111. The sealing plate 12 is a straight plate structure made of steel or other materials. The sealing plate 12, which serves as the bottom wall of the buffer groove 111, is detachably connected to the contact support 1, which facilitates the limiting member 51 to be limited and installed in the buffer groove 111. The sealing plate 12 and the contact support 1 can be connected by fasteners, snap-fit, or other connection methods. Of course, the sealing plate 12 can also be integrally connected to the contact support 1, that is, the contact support 1 directly has a buffer groove 111 with a bottom wall.

[0050] Preferably, the limiting member 51 is provided with a limiting protrusion 512, and the side wall of the buffer groove 111 is provided with a blocking protrusion 112. The blocking protrusion 112 and the limiting protrusion 512 cooperate to limit the limiting member 51 from falling out of the buffer groove 111. The limiting member 51 is preferably a cylindrical structure, but it can also be a square or other shaped column structure. The top of the limiting member 51 is a protruding part 511, and the bottom of the limiting member 51 has a radially protruding annular limiting protrusion 512. Correspondingly, the buffer groove 111 is a circular groove, and the top opening of the side wall of the buffer groove 111 has an annular blocking protrusion 112.

[0051] Preferably, a spring limiting groove is provided on the bottom side of the limiting member 51 of the buffer mechanism 5. One end of the buffer spring 52 abuts against the spring limiting groove, and the other end abuts against the bottom wall of the buffer groove 111, so that the limiting member 51 and the buffer spring 52 of the buffer mechanism 5 are more compactly arranged, reducing the size of the buffer mechanism 5. The buffer spring 52 is preferably a compression spring, but it can also be a tension spring, leaf spring, etc.

[0052] like Figure 1 , Figure 3 , Figure 4 and Figure 8As shown, the switching device in this embodiment has a three-phase structure. The contact support 1 has three support structures, and two electromagnetic systems 8 are respectively arranged on both sides of the three support structures. The three support structures are arranged sequentially along the length direction of the linkage shaft 80, which is the first direction. The arc extinguishing cover 72 is provided with partitions 721 between two adjacent support structures. The partitions 721 have clearance grooves on the side away from the base 71 to avoid the linkage shaft 80. The linkage shaft 80 passes through the space above the three support structures in sequence to drive the three support structures to move simultaneously. Each of the three support structures is provided with a moving contact 3, and each support structure is provided with two stationary contacts 4 on the other two sides. When the support structure moves, the moving contact 3 contacts and separates from the corresponding two stationary contacts 4. In this embodiment of the switching device, the first electromagnetic system 8, three support structures, and the second electromagnetic system 8 are sequentially arranged along the length of the linkage shaft 80. The moving contact 3 is mounted on the support structure, with both ends extending from it. The length direction of the moving contact 3 is perpendicular to the length direction of the linkage shaft 80. On both sides of each support structure, there are stationary contacts 4 corresponding to the two ends of the moving contact 3. The line connecting two stationary contacts 4 is perpendicular to the length direction of the linkage shaft 80. It is understood that the number of support structures can be adjusted, and the number of moving contacts 3 and stationary contacts 4 can also be adjusted accordingly. For example, one, two, or more support structures can be provided. These multiple support structures can be integrally injection molded to form contact support 1, or multiple support structures spliced ​​together to form contact support 1, or multiple support structures can be individually connected to the linkage shaft 80. Since the multiple support structures are arranged along the length direction of the linkage shaft 80, the two electromagnetic systems 8 can simultaneously drive the multiple support structures to move via the linkage shaft 80 without increasing the height of the switching device.

[0053] In this embodiment, the three support structures are arranged at intervals on the top side of the contact support base plate 11 at the middle position. The contact support base plate 11 has a buffer groove 111 on each side of the gap between every two adjacent support structures. Correspondingly, each buffer groove 111 contains a buffer mechanism 5. The moving contact 3 and the buffer mechanism 5 are positioned near the middle of the contact support base plate 11. Multiple reaction springs 2 are arranged at intervals on both sides of the bottom side of the contact support base plate 11, with the reaction springs 2 positioned near the edge of the contact support base plate 11. In this embodiment, the contact support base plate 11 has a first reinforcing plate 113 connected to the outer wall of the support structure, and a second reinforcing plate 114 connected between two adjacent support structures. The reaction springs 2, the moving contact 3, and the buffer mechanism 5 are reasonably and compactly arranged on the contact support 1, making the contact support 1 more evenly and stably stressed.

[0054] Furthermore, the inlet and outlet ends of the contact system 300 protrude from both ends of the partition 721 along its length and from both ends of the base 71 along its length, respectively. That is, the two stationary contact plates 40, serving as the inlet and outlet ends of the contact system 300, extend from both sides of the housing along its length, allowing for direct connection to other equipment and avoiding complex wiring operations. The length of the partition 721 is equal to the length of the base 71. Optionally, a baffle 722 is provided between the two ends of adjacent partitions 721 along its length. The baffle 722 is preferably vertically connected between adjacent partitions 721. The baffle 722 has vent holes to prevent the high-temperature gas generated during arc extinguishing from being directly ejected. The baffle 722 is detachably connected to the partition 721, and the sides of both ends of the partition 721 along its length are provided with first slots 724 that engage with the sides of the baffle 722. Optionally, arc-blocking plates 723 are provided at both ends of the partition 721 along its length. The arc-blocking plates 723 are arranged along the length of the partition 721. That is, the arc-blocking plates 723 separate the portions of two adjacent stationary contact plates 40 that are used as inlet terminals and the portions of two adjacent stationary contact plates 40 that are used as outlet terminals from protruding from the partition 721. This can prevent the ejected electric arc from causing a short circuit between phases, thereby improving electrical isolation performance and making it safer to use. The arc-blocking plates 723 and the partition 721 are detachably connected. The end faces of both ends of the partition 721 along its length are provided with second slots 725 that are inserted and mated with the sides of the arc-blocking plates 723.

[0055] like Figure 1 and Figure 9As shown, arc-extinguishing mechanisms are provided at both ends of the moving contact 3, and the arc-extinguishing mechanism includes an arc-extinguishing structure 91. In this embodiment, the arc-extinguishing cover 72 is provided with a first arc-inducing element 92 and a second arc-inducing element 93 at the two ends of the moving contact 3 in a third direction, and an arc-extinguishing structure 91 is located between the first arc-inducing element 92 and the second arc-inducing element 93. The arc-extinguishing structure 91 includes a plurality of spaced arc-extinguishing grids for interrupting and cooling the electric arc formed between the moving contact 3 and the stationary contact 4. The first arc-inducing element 92 is located on the side of the arc-extinguishing structure 91 near the moving contact 3, and the second arc-inducing element 93 is located on the side of the arc-extinguishing structure 91 away from the moving contact 3. The first arc-inducing element 92 is used to guide the electric arc toward the arc-extinguishing structure. 91. Multiple arc-extinguishing grids are used to divide the electric arc into several shorter arcs, which increases the voltage drop on the separated moving contact 3 and stationary contact 4, thereby interrupting the current and improving the breaking capacity. The second arc-inducing element 93 is used to block the electric arc. The upper cover 73 is used to protect the first arc-inducing element 92, the second arc-inducing element 93, and the arc-extinguishing structure 91 in the arc-extinguishing cover 72. In this embodiment, the two first arc-inducing elements 92 at both ends of each moving contact 3 are connected. Specifically, the first arc-inducing element 92 has a U-shaped structure, and the opposite sides of the two first arc-inducing elements 92 at both ends of each moving contact 3 are connected by a connecting plate 921. Of course, the two first arc-inducing elements 92 at both ends of each moving contact 3 can also be set independently. Furthermore, the second arc-inducing member 93 is also used to guide the electric arc towards the arc-extinguishing structure 91. The bottom side of the second arc-inducing member 93 extends towards the stationary contact point of the stationary contact 4 and is provided with an arc-inducing part 931. The arc-inducing part 931 is connected to the side of the stationary contact 4 where the stationary contact point is located (i.e., the top side of the stationary contact block 41 of the stationary contact 4) to improve the effect of the second arc-inducing member 93 in blocking the electric arc and inducing the arc. The arc-initiating part 931 is preferably a U-shaped structure, including a top side and a bottom side of the arc-initiating part 931, and a closed side connecting the top side and the bottom side of the arc-initiating part 931 and opposite to the opening. The arc-initiating part 931 has a clearance notch at the end away from the opening to avoid the stationary contact. The portion of the stationary contact block 41 with the stationary contact is protruding, and the clearance notch is also used to avoid the protruding portion of the stationary contact block 41 with the stationary contact. The bottom side of the arc-initiating part 931 is stacked and fixed on the side of the stationary contact block 41 of the stationary contact 4, that is, it is arranged around the protruding portion of the stationary contact block 41 with the stationary contact. The arc-initiating part 931 of the second arc-initiating member 93 has a U-shaped bend design, so that the arc flow direction of the top side of the arc-initiating part 931 is opposite to the current flow direction from the moving contact 3 to the stationary contact 4. Figure 9Taking the left-hand stationary contact 4 as the inlet terminal of the contact system 300 and the right-hand stationary contact 4 as the outlet terminal of the contact system 300 as an example, when the moving contact 3 contacts the stationary contact 4, the current flow direction from the moving contact 3 to the stationary contact 4 is direction a in the figure, that is, from left to right. The arc flow direction on the top side of the arc-initiating part 931 is direction b in the figure, that is, from right to left. Thus, the arc on the top side of the arc-initiating part 931 moves towards the arc-extinguishing structure 91 under the action of the magnetic field to improve the arc-initiating effect. The bottom side of the arc-initiating part 931 and the stationary contact 4 can be connected by fasteners, welding or other connection methods. For example, the bottom side of the arc-initiating part 931 of the second arc-initiating member 93, the stationary contact block 41 and the stationary contact plate 40 of the stationary contact 4 are connected together by screws. The second arc-initiating element 93 can be made of a magnetic material. Once an electric arc is formed between the moving contact 3 and the stationary contact 4, the second arc-initiating element 93 can guide the electric arc to enter the arc-extinguishing structure 91 more effectively.

[0056] In addition, such as Figure 4 As shown, the moving contact 3 has a multi-layer plate structure, including a moving contact plate with moving contacts. The moving contact 3 also includes a magnetic plate 32, which can increase the electro-repulsive force between the contacts, so that the electric arc can better enter the arc extinguishing structure 91. Among them, the magnetic plate 32 is a steel plate structure, but the magnetic plate 32 can also be made of other magnetic materials. The magnetic plate 32 is set away from the moving contacts of the moving contact 3. Specifically, the magnetic plate 32 is the top layer of the moving contact 3, and the magnetic plates 32 are stacked on the moving contact plate, that is, the moving contact plate is the bottom layer of the moving contact 3, and the moving contacts are set on the bottom side of the moving contact plate.

[0057] like Figure 3-5 As shown, in one embodiment of the mating structure between the contact support 1 and the moving contact 3, the support structure of the contact support 1 is provided with a contact spring 10 and a clamping structure 6 connected to the contact spring 10. The clamping structure 6 extends to the outside of the support structure to push the moving contact 3. The contact spring 10 drives the moving contact 3 to be pressed against the upper limit of the outer side of the support structure through the clamping structure 6. When the contact support 1 drives the moving contact 3 to contact the stationary contact 4, since the moving contact 3 is pressed against the upper limit of the support structure of the contact support 1, the contact support 1 moves and compresses the contact spring 10. The contact spring 10 drives the moving contact 3 to be pressed against the upper limit of the stationary contact 4 through the clamping structure 6, thereby increasing the contact pressure between the stationary contact 4 and the moving contact 3.

[0058] Specifically, the support structure of the contact support 1 is a hollow tetrahedral structure, including two first side plates 13 arranged opposite each other, and two second side plates 14 connected between the two first side plates 13. The first side plates 13 are used to separate each phase. The two first side plates 13 and the two second side plates 14 are connected by a top plate 15. A support space for accommodating the clamping structure 6 and the contact spring 10 is formed between the two first side plates 13, the two second side plates 14 and the top plate 15. The contact support base plate 11 is provided with an installation entrance that communicates with the support space. The clamping structure 6 has a U-shaped structure and includes two opposing spring bracket sides 61 and a spring bracket bottom 62 connected between the two spring bracket sides 61. The contact spring 10 is disposed between the spring bracket bottom 62 and the inner side of the top plate 15 and abuts against the spring bracket bottom 62 and the inner side of the top plate 15 respectively. The two first side plates 13 are respectively set higher than the top plate 15, and each of the two first side plates 13 has a sliding groove 131 on its facing side. The spring bracket sides 61 are slidably fitted in the slide grooves 131. The ends of the two spring bracket sides 61 furthest from the bottom 62 of the spring bracket extend from the slide grooves 131 to the outer side of the top plate 15. The ends of the two spring bracket sides 61 located on the outer side of the top plate 15 are connected to the pressure rod 63. The moving contact 3 is disposed between the pressure rod 63 and the outer side of the top plate 15. The pressure rod 63 is used to press the moving contact 3 against the upper limit of the top plate 15. A limiting groove 31 that mates with the pressure rod 63 is provided on the moving contact 3. Of course, the pressing structure 6 can also adopt other shapes.

[0059] In this embodiment, a linkage bracket 16 is provided on the top side of the first side plate 13 of the contact support 1. The top side of the linkage bracket 16 is provided with a linkage groove 161 that mates with the linkage shaft 80. To reduce the friction between the linkage shaft 80 and the linkage bracket 16, a bushing can be fitted on the portion of the linkage shaft 80 that is placed in the linkage groove 161 of the linkage bracket 16. The linkage bracket 16 is detachably connected to the first side plate 13 of the contact support 1. The linkage bracket 16 is provided with a fixing protrusion 162, and the top side of the first side plate 13 of the contact support 1 is provided with a fixing groove 132. The linkage bracket 16 is fixed to the top side of the first side plate 13 by inserting the fixing protrusion 162 into the fixing groove 132. The linkage bracket 16 can also be integrally connected to the contact support 1. The linkage bracket 16 and the contact support 1 can also be connected by fasteners, snap-fit ​​connections, or other connection methods.

[0060] Furthermore, a heat insulation plate 17 is provided between the moving contact 3 and the top plate 15 of the contact support 1 to prevent the moving contact 3 from directly contacting the contact support 1 and to prevent the moving contact 3 from overheating and damaging the contact support 1. Specifically, a heat dissipation groove 171 is provided on the top side of the heat insulation plate 17. The heat insulation plate 17 is preferably a straight plate structure, and both ends of the heat insulation plate 17 are respectively provided with limiting flanges 172 that cooperate with the limiting flanges 172 of the top plate 15. The top plate 15 is located between the two limiting flanges 172 of the heat insulation plate 17.

[0061] refer to Figure 3-5 Another embodiment of the mating structure between the contact support 1 and the moving contact 3 (not shown in the figure) is that the moving contact 3 passes through the contact support 1, and the contact support 1 is provided with a through cavity for accommodating the moving contact 3 and the contact spring 10. The moving contact 3 is disposed in the through cavity, and its two ends extend out of the through cavity to mate with the stationary contact 4. One end of the contact spring 10 abuts against the moving contact 3, and the other end abuts against the side wall of the through cavity.

[0062] like Figure 5 and Figure 6 As shown, the electromagnetic system 8 in this embodiment also includes a fixedly arranged lower armature 83, an upper armature 81 and a lower armature 83 arranged opposite each other along a second direction, that is, the upper armature 81 is arranged above the lower armature 83, a coil frame 84 is arranged between the upper armature 81 and the lower armature 83, the coil 82 is arranged outside the coil frame 84, the contact support 1 and the reaction spring 2 are arranged along the second direction, that is, the contact support 1 is arranged above the reaction spring 2, the coil 82 is used to generate electromagnetic force to drive the upper armature 81 to move in the direction of the lower armature 83, so that the upper armature 81 drives the contact support 1 to move in the direction of the reaction spring 2 through the linkage shaft 80, that is, the linkage shaft 80 presses down the contact support 1; the reaction spring 2 is used to drive the contact support 1 to move away from the reaction spring 2, that is, the reaction spring 2 pushes up the contact support 1.

[0063] Specifically, the upper armature 81 is T-shaped and includes a transverse portion 811 and a longitudinal portion 812 connected to the middle of the transverse portion 811. The transverse portion 811 has a linkage hole at its connection with the longitudinal portion 812. Both ends of the linkage shaft 80 are respectively inserted into the linkage holes of the upper armatures 81 of the two electromagnetic systems 8, allowing the two upper armatures 81 to drive the linkage shaft 80 to move. The longitudinal portion 812 is inserted into the inner side of the coil frame 84. The lower armature 83 is used to attract the longitudinal portion 812, causing the longitudinal portion 812 to drive the upper armature 81 to move. Both ends of the transverse portion 811 are respectively connected to a return spring (not shown in the figure), which is used to reset the upper armature 81. Alternatively, in other embodiments, a return spring may not be provided. When the coil 82 is de-energized, the contact support 1, under the action of the reaction spring 2, causes the moving contact 3 to separate from the stationary contact 4. Simultaneously, the contact support 1, through the linkage shaft 80, drives the upper armatures 81 of the two electromagnetic systems 8 to reset. In order to reduce the friction between the linkage shaft 80 and the upper armature 81, a bushing can be fitted on the part of the linkage shaft 80 that is inserted into the linkage hole of the upper armature 81.

[0064] Furthermore, such as Figure 10 As shown, the electromagnetic system 8 also includes an upper armature housing 85, which at least covers the top of the upper armature 81, that is, at least covers the transverse portion 811 of the upper armature 81. The linkage shaft 80 passes through the upper armature housing 85 and is connected to the portion of the upper armature 81 located inside the upper armature housing 85 (the transverse portion 811). The upper armature housing 85 reduces the friction between the upper armature 81 and the side cover 76 of the housing, giving the upper armature 81 better operating characteristics. The upper armature housing 85 also cooperates with the auxiliary side hanger 86 for driving. When the upper armature 81 moves in the direction of the lower armature 83, it can drive the upper armature housing 85 to drive the auxiliary side hanger 86. When coil 82 is energized, the upper armature 81, driven by electromagnetic force, moves the upper armature housing 85 and the linkage shaft 80 downwards together. After moving a certain distance, the upper armature housing 85 comes into contact with the auxiliary side hanger 86, and then drives the auxiliary side hanger 86 to continue moving downwards until the upper armature 81 and lower armature 83 are closed. The auxiliary side hanger 86 can be used to provide feedback on whether the upper armature 81 and lower armature 83 of the electromagnetic system 8 are in a closed state.

[0065] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0066] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. Switched electrical apparatus, characterized in that: The device includes a housing and a contact support (1), a reaction spring (2), a contact system (300), and two electromagnetic systems (8) disposed within the housing. The two electromagnetic systems (8) are disposed opposite to each other on both sides of the contact system (300). Each electromagnetic system (8) includes an upper armature (81) and a coil (82) for driving the upper armature (81) to move. The upper armatures (81) of the two electromagnetic systems (8) are connected by a linkage shaft (80). The contact system (300) includes a moving contact (3) and a stationary contact (4) disposed opposite to each other. The moving contact (3) is mounted on the contact support (1). The top side of the contact support (1) is provided with a linkage groove (161) that cooperates with the linkage shaft (80). The linkage shaft (80) is installed in the linkage groove (161). The two electromagnetic systems (8) drive the contact support (1) to move linearly against the force of the reaction spring (2) through the linkage shaft (80), so that the contact support (1) drives the moving contact (3) to contact the stationary contact (4). Under the action of the reaction spring (2), the contact support (1) drives the moving contact (3) to separate from the stationary contact (4).

2. The switchgear according to claim 1, characterized in that: The top side of the contact support (1) is provided with a linkage bracket (16), and the linkage groove (161) is provided on the top side of the linkage bracket (16).

3. The switchgear according to claim 1, characterized in that: The housing includes a base (71) and an arc-extinguishing cover (72) disposed on the top side of the base (71). A top cover (73) is provided above the arc-extinguishing cover (72). The contact system (300) is disposed inside the arc-extinguishing cover (72) and the base (71). An arc-extinguishing mechanism is provided in the arc-extinguishing cover (72). Two protruding boss structures (74) are provided on the top side of the base (71). The middle part of the two boss structures (74) is respectively provided with a groove structure (75) for accommodating the electromagnetic system (8).

4. The switchgear according to claim 3, characterized in that: The groove structure (75) has a notch near the side wall of the housing. The housing has a side cover (76) corresponding to the notch. The side cover (76) is L-shaped. One end of the side cover (76) closes the top of the groove structure (75), and both sides of one end of the side cover (76) extend outward to form a fixing part (761) that covers the top side of the boss structure (74). The other end of the side cover (76) closes the side notch of the groove structure (75).

5. The switchgear according to claim 3, characterized in that: The contact system (300) is provided with multiple support structures, each of which is provided with a moving contact (3). The multiple support structures are arranged sequentially along the length direction of the linkage shaft (80). The arc extinguishing cover (72) is provided with a partition (721) between two adjacent support structures. The partition (721) is provided with a clearance groove on the side away from the base (71) to avoid the linkage shaft (80). The linkage shaft (80) passes through the space above the multiple support structures in sequence. The inlet and outlet ends of the contact system (300) protrude from both ends of the partition (721) along the length direction and from both ends of the base (71) along the length direction.

6. The switchgear according to claim 5, characterized in that: The length of the partition (721) is equal to the length of the base (71), wherein baffles (722) are provided between the two ends of the length direction of two adjacent partitions (721), and the baffles (722) are provided with exhaust holes; And / or, the partition (721) is provided with arc-blocking plates (723) at both ends of its length direction, and the length direction of the arc-blocking plates (723) is arranged along the length direction of the partition (721).

7. Switched electrical apparatus according to any of claims 1-6, characterized in that: The two electromagnetic systems (8) are arranged opposite each other on both sides of the contact support (1) along the first direction. The coil (82) is used to drive the upper armature (81) to move along the second direction and drive the contact support (1) to move along the second direction. The inlet and outlet ends of the contact system (300) are arranged along the third direction. The first direction, the second direction and the third direction are arranged perpendicular to each other.

8. The switchgear according to claim 7, characterized in that: The contact support (1) has two stationary contacts (4) on both sides, which serve as the inlet and outlet of the contact system (300) respectively. The two stationary contacts (4) are arranged along a third direction. The contact support (1) is used to drive the moving contact (3) to contact and separate from the stationary contacts (4) at both ends simultaneously.

9. The switchgear according to claim 7, characterized in that: The moving contact (3) has arc-extinguishing structures (91) at both ends of its third-direction upward direction. Each arc-extinguishing structure (91) includes a plurality of spaced arc-extinguishing grids. The moving contact (3) has a first arc-inducing element (92) and a second arc-inducing element (93) at both ends of its third-direction upward direction. The corresponding arc-extinguishing structure (91) is located between the first arc-inducing element (92) and the second arc-inducing element (93). The first arc-inducing element (92) is located on the side of the arc-extinguishing structure (91) close to the moving contact (3), and the second arc-inducing element (93) is located on the side of the arc-extinguishing structure (91) away from the moving contact (3). The bottom side of the second arc-inducing element (93) extends toward the stationary contact point of the stationary contact (4) and has an arc-inducing portion (931). The arc-inducing portion (931) is connected to the side of the stationary contact (4) where the stationary contact point is located.

10. The switchgear according to claim 9, characterized in that: The arc-leading part (931) has a U-shaped structure, including the top side and bottom side of the arc-leading part (931) and a closed side connected between the top side and bottom side of the arc-leading part (931) and opposite to the opening. The arc-leading part (931) has a clearance notch at the end away from the opening for avoiding the stationary contact. The bottom side of the arc-leading part (931) is stacked and fixed on the side of the stationary contact (4) where the stationary contact is located.

11. The switchgear according to claim 9, characterized in that: The first arc-leading component (92) has a U-shaped structure, and the two first arc-leading components (92) at both ends of each moving contact (3) are connected by a connecting plate (921) on their opposite sides.

12. The switchgear according to claim 7, characterized in that: The electromagnetic system (8) further includes a lower armature (83) and a coil frame (84). The upper armature (81) and the lower armature (83) are arranged opposite each other along the second direction. The coil frame (84) is arranged between the upper armature (81) and the lower armature (83). The coil (82) is arranged outside the coil frame (84). The contact support (1) and the reaction spring (2) are arranged along the second direction. The coil (82) is used to drive the upper armature (81) to move in the direction of the lower armature (83), so that the upper armature (81) drives the contact support (1) to move in the direction of the reaction spring (2) through the linkage shaft (80). The reaction spring (2) is used to drive the contact support (1) to move away from the reaction spring (2).

13. The switchgear according to claim 12, characterized in that: The electromagnetic system (8) also includes an upper armature housing (85), which at least covers the top of the upper armature (81), and the linkage shaft (80) passes through the upper armature housing (85) and is connected to the part of the upper armature (81) located inside the upper armature housing (85).

14. The switchgear according to claim 13, characterized in that: The upper armature cover (85) also works in conjunction with the auxiliary side hanger (86). When the upper armature (81) moves in the direction of the lower armature (83), it can drive the upper armature cover (85) to drive the auxiliary side hanger (86).

15. The switchgear according to claim 1, characterized in that: A contact heat insulation plate (17) is provided between the moving contact (3) and the contact support (1); And / or, the moving contact (3) is a multi-layer plate structure, including a magnetic plate (32).

Images