Switch having at least two poles

Abstract

Provided in the present application is a switch having at least two poles. The switch at least comprises an insulating housing and components arranged inside the insulating housing, wherein the components at least comprise a movable contact device, a stationary contact device, an operating mechanism and an electromagnet mechanism, a linkage device being provided between the movable contact device and the electromagnet mechanism.

Description

A switch with at least two poles

[0001] Cross-reference to Related Applications

[0002] This application claims priority to Chinese application patent 202410713064.X, filed on June 04, 2024, entitled “A switch with at least two poles”, and Chinese application patent 202411305167.9, filed on September 19, 2024, entitled “A switch with at least two poles”, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present application belongs to the technical field of low-voltage electrical apparatus, and specifically relates to a switch with at least two poles. BACKGROUND

[0004] In recent years, with the increasing policy support for the energy storage industry in China and the iterative update of battery technology, energy storage plays a crucial role in the power system, can balance supply and demand, and improve the flexibility and reliability of the power system. Energy storage systems have increasingly high short-circuit withstand performance requirements for electrical protection equipment, and there are many occasions that require electrical equipment to meet both high-voltage arc interruption and high short-circuit withstand performance. Therefore, providing a low-cost, small-size switch scheme that meets high voltage and high short-circuit withstand performance has become an urgent need to break through the technical bottleneck in the industry.

[0005] SUMMARY

[0006] Based on the above background, the present application provides a switch with at least two poles to improve the short-circuit withstand performance index of electrical switches in a low-cost and high-performance manner without affecting the mechanical life of the product, effectively solving the above technical problems.

[0007] The present application discloses a switch with at least two poles, which comprises an insulating shell and internal components arranged inside the shell. The internal components at least include: a moving contact device, a stationary contact device, an operating mechanism, and an electromagnet mechanism. A linkage device is arranged between the moving contact device and the electromagnet mechanism.

[0008] In this way, by arranging a linkage device between the electromagnet mechanism and the moving contact device, when the operating mechanism drives the moving contact device to move, the moving contact device drives the linkage device, and in turn drives the armature in the electromagnet mechanism to move. When a short-circuit current is encountered in the circuit, the armature can quickly act, and pressure is applied to the moving contact before the short-circuit current reaches the peak value, which can more reliably avoid the risk of the electrodynamic repulsive force generated by the moving and stationary contacts when the short-circuit current flows, repelling the moving contact, and quickly improving the short-time withstand capability of the circuit.

[0009] The beneficial effects of the present application are as follows:

[0010] 1. The moving contact is arranged to move with the electromagnet mechanism, and the moving contact drives the armature of the electromagnet mechanism to move during the closing process of the moving contact. In the closed state of the moving contact, the armature is close to or next to the contact piece of the moving contact. In the case of short-circuit current in the loop, the magnetic attraction force generated by the electromagnet mechanism can make the armature press the contact finger of the moving contact more quickly, and more reliably avoid the repulsion of the moving contact and the static contact due to the short-circuit current and the repulsion of the magnetic force, thereby improving the short-time withstand performance.

[0011] 2. The main contact and arc contact are arranged by the moving contact device, and the arc contact is arranged to close first and open later than the main contact, so that the arc contact of the switch is matched with the large opening distance of the multi-grid piece to perform closing and opening under voltage, thereby improving the arc extinguishing performance of high voltage. The main contact is matched with the linkage type or pre-pressing type armature pressing structure, thereby improving the short-time withstand performance under the smallest time constant. In summary, the new switch meets the requirements of high short-time withstand performance and the performance requirements of photovoltaic PV2 usage category under high voltage.

[0012] 3. The structure is compact and small in size, and the volume is smaller and the cost is lower than that of the universal circuit breaker with the same current capacity. Compared with the molded case circuit breaker or disconnector with the same current capacity, the short-time withstand performance is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following only some embodiments described in the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0014] Fig. 1 is a structure schematic diagram of the at least two-pole switch in the open state according to the present embodiment;

[0015] Fig. 2 is a cross-sectional view of the at least two-pole switch in the closed state according to the present embodiment;

[0016] Fig. 3 is a structure schematic diagram of the electromagnet mechanism in the at least two-pole switch according to the present embodiment;

[0017] Fig. 4 is a structure schematic diagram of the insulating shell of the at least two-pole switch according to the present embodiment;

[0018] Fig. 5 is a structure schematic diagram of the at least two-pole switch according to the present embodiment;

[0019] Fig. 6 is a structure schematic diagram of the arc extinguishing device in the at least two-pole switch with high short-time withstand current according to the present embodiment;

[0020] Fig. 7 is a structural schematic diagram of a two-stage short-time high-resistance current switch in a closed state according to another embodiment of the present application;

[0021] Fig. 8 is a structural schematic diagram of the two-stage short-time high-resistance current switch in a split state according to the embodiment shown in Fig. 7;

[0022] Fig. 9 is a schematic diagram of a linkage structure of the two-stage short-time high-resistance current switch according to the embodiment shown in Fig. 7. DETAILED DESCRIPTION

[0023] To make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described in more detail below with reference to the accompanying drawings. In the accompanying drawings, the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some of the embodiments of the present application, not all of the embodiments.

[0024] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0025] In order to improve the short-circuit resistance of short-circuit current electrical components in the low-voltage electrical appliance industry, the conventional and common way is to increase the final pressure between the moving contact and the static contact to press the electrodynamic repulsive force and the magnetic force generated by the short-circuit current, to ensure the reliable connection of the electrical moving contact and the static contact under short-circuit conditions. The commonly used technical solution is to increase the force value of the operating mechanism spring and the contact spring to form a large contact final pressure. Obviously, this method requires more stringent process and material requirements, increases the production cost, and the contact final pressure still exists when there is no short-circuit current in the circuit. The force value of the operating mechanism spring and the contact spring is large, which will generate a large impact stress, causing great wear to the contact and the operating mechanism, affecting the service life of the electrical components.

[0026] The short-circuit current time constant of the battery / battery module of the energy storage industry is usually 1-3 ms, that is, the short-circuit current rises rapidly and reaches a peak value soon, and the electrodynamic repulsive force generated by the moving contact and the static contact will soon exceed the tension of the moving contact spring, so the moving contact contact piece will be quickly repelled. Because the gap between the armature and the yoke of the conventional electromagnetic mechanism pressure component is relatively large in the initial state, the short-circuit current magnetic field suction force of the armature pressure component is relatively small, and there is also a distance of an idle stroke, so the movement of the armature component of the electromagnetic mechanism to the moving contact contact piece and the action time of the pressure applied to the moving contact contact piece will be relatively long, and at this time the moving contact contact piece may have been quickly repelled, so the armature component of the commonly used electromagnetic mechanism is difficult to quickly act to apply an additional pressure to the moving contact contact piece to overcome the electrodynamic repulsive force of the moving contact and the static contact, thereby affecting the effect of the armature magnetic increase pressure on improving the short-time withstand performance.

[0027] In addition, the photovoltaic industry usually requires that the electrical components meet the PV2 use category, and in many cases, the high rated voltage is required to be connected and disconnected with electricity. The switching of the arc with electricity will produce an arc. The main function of the disconnector is to separate and connect the circuit, and it usually does not have high voltage arc extinguishing capability. In the case where arc extinguishing capability is required, other devices such as circuit breakers are usually used in cooperation, which not only increases the cost of electrical equipment, but also complicates the circuit and power distribution system. Therefore, the disconnector with high voltage and electricity disconnection and effective arc extinguishing in a short time has become a bottleneck that must be broken through in the low-voltage industry.

[0028] Moreover, the energy storage industry PCS cabinet has higher requirements for the compactness of the installation space of the electrical product, the temperature rise capacity of the carrying current, and the cost performance of the product.

[0029] In summary, it is an urgent need to provide a low-cost, small-size, high-voltage, and high short-time performance switch solution to break through the technical bottleneck of the industry.

[0030] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0031] Please refer to Fig. 1 and Fig. 2, the embodiment discloses a switch with at least two poles, the switch at least comprises an insulating shell and internal components arranged in the interior, the internal components at least comprise: a moving contact device 1, a stationary contact device 2, an arc extinguishing device 3, an operating mechanism 4, an electromagnet mechanism 5, wherein the moving contact device 1 comprises a long moving contact 13 and a short moving contact 12, the long moving contact 13 and the short moving contact 12 are arranged along the width direction of the switch, one end of the long moving contact 13 and the short moving contact 12 is respectively rotationally connected to the operating mechanism 4, and the other end is provided with a moving contact point on the lower end face, and the short moving contact 13 is further provided with an arc separation cover 131 on the side away from the moving contact point, and the other end of the short moving contact 13 is further provided with an insulating head cover 132, and the arc separation cover 131 and the insulating head cover 132 are both made of insulating material.

[0032] The stationary contact device 2 comprises a coupling plate 23 and a stationary contact point arranged on the coupling plate, the stationary contact point comprises a first stationary contact point 21 and a second stationary contact point 22 arranged in front and back, the first stationary contact point 21 is arranged close to the operating mechanism 4, the second stationary contact point 22 is arranged away from the operating mechanism 4, the height of the first stationary contact point 21 is lower than that of the second stationary contact point 22, the short moving contact 12 is arranged above the first stationary contact point 21 and corresponds to the first stationary contact point 21, and the long moving contact 13 is arranged above the second stationary contact point 22 and corresponds to the second stationary contact point 22.

[0033] The short moving contact 12 is a main contact, and the long moving contact 13 is an arc contact, the length of the long moving contact 13 is greater than that of the short moving contact 12, so that when the switch is closed, the contact of the long moving contact 13 with the second stationary contact point 22 is earlier than that of the short moving contact 12 with the first stationary contact point 21; when the switch is opened, the disconnection time of the long moving contact 13 with the second stationary contact point 22 is later than that of the short moving contact 12 with the first stationary contact point 21. The arc extinguishing device 3 is arranged in front of the long moving contact 13 and is used for extinguishing the arc generated between the long moving contact 13 and the second stationary contact point 22. In this way, when the switch is opened, the short moving contact 12 and the first stationary contact point 21 are separated first, at this time the long moving contact 13 and the second stationary contact point 22 are still in contact, and the loop is still in a conductive state, therefore, no arc is generated between the short moving contact 12 and the first stationary contact point 21, with the opening operation, the long moving contact 13 and the second stationary contact point 22 are separated, the arc is generated between the long moving contact 13 and the second stationary contact point 22, and then enters the arc extinguishing device 3 to complete arc extinguishing.

[0034] The opening distance between the long moving contact 13 and the second stationary contact point 22 is greater than that between the short moving contact 12 and the first stationary contact point 21. The large opening distance between the long moving contact 13 and the second stationary contact point 22 is conducive to arc drawing.

[0035] The electromagnet mechanism 5 is arranged on part or all of the static contact device 1 and is arranged at the front end of part or all of the moving contact device 1. In this embodiment, the electromagnet mechanism 5 is arranged on part of the static contact device 1. Specifically, referring to FIGS. 1 and 3, the electromagnet mechanism 5 includes a fixed support 54 fixed on the connecting plate 23, an armature 51 rotationally connected to the fixed support 54 through a rotating shaft 53, and a magnetic yoke 52 fixedly arranged on the connecting plate 23. The magnetic yoke 52 is in a U shape and wraps the connecting plate 23 and the first static contact 21. The armature 51 is arranged at the front end of the short moving contact 12. The magnetic yoke 52 and the armature 51 are formed by at least one magnetic sheet. The magnetic yoke 52 and the armature 51 formed by multiple magnetic sheets are beneficial to increasing the magnetic field strength. The armature 51 rotates under the action of the magnetic field and cooperates with the magnetic yoke 52 to form a rotating and clapping action. The operating mechanism 4 drives the moving contact device 1 and the electromagnet mechanism 5 to move. Part of the structure of the armature 51 is above the short moving contact 12 and a linkage device 6 is arranged between the short moving contact 12 and the moving contact device 1.

[0036] In this embodiment, the magnetic yoke 52 arranged on the connecting plate is in a fixed state. The armature 51 arranged above the magnetic yoke 52 and the magnetic yoke 52 can form a closed magnetic circuit. The armature 51 can rotate relative to the magnetic yoke 52. When a short-circuit current appears on the connecting plate passing through the center of the armature 51 and the magnetic yoke 52, the armature 51 will be attracted to the magnetic yoke 52 under the action of a strong magnetic field, so that the armature 51 applies an external force to the short moving contact 12, increases the pressure of the short moving contact 12 on the first static contact 21, and prevents the short moving contact 12 and the first static contact 21 from being repelled by the electric repulsion and the HOM force under the condition of a large current.

[0037] When the short moving contact 12 and the first static contact 21 and the long moving contact 13 and the second static contact 22 are disconnected, and the short moving contact 12 and the first static contact 21 and the long moving contact 13 and the second static contact 22 are in contact, and there is no short-circuit current in the loop, the armature 51 and the magnetic yoke 52 are in an open state. When the short moving contact 12 and the first static contact 21 and the long moving contact 13 and the second static contact 22 are in contact, and a short-circuit current appears in the loop, the armature 51 and the magnetic yoke 52 form a closed magnetic circuit, generate a magnetic attraction force, and the armature 51 rotates relative to the magnetic yoke 52. The armature 51 pressurizes the short moving contact 12.

[0038] The first static contact 21 is arranged horizontally relative to the length direction of the switch or is inclined toward the rotating center of the moving contact device. The arrangement of the first static contact 21 can reduce the repulsion force arm formed between the rotating center of the contact and the contact surface of the first static contact 21. The smaller the repulsion force arm is in the closed state, the greater the pressure of the short moving contact 12 on the first static contact 21 is. When a short-circuit current appears in the loop, the electric repulsion generated by the short moving contact 12 and the first static contact 21 is more difficult to repel the short moving contact 12, and the short-time withstand capability is relatively enhanced.

[0039] Please continue to refer to FIG. 1, FIG. 2 and FIG. 3, the linkage device 6 includes a first pressing plate 61 and a second pressing plate 62, both of which are connected with the armature 51, specifically, one end of the first pressing plate 61 and the second pressing plate 62 is fixed at one end of the armature, and the fixing mode can be riveting or screw connection, the first pressing plate 61 is a long plate extending along the length direction of the armature 51 and is attached to the lower surface of the armature 51, the second pressing plate 62 is a curved long plate, one end of which is attached to the lower end of the first pressing plate 61 and is fixed with the first pressing plate 61 and the armature 51, the other end extends along the lower surface of the first pressing plate 61 for a distance and extends downwardly, so that the first pressing plate 61 and the second pressing plate 62 form a bifurcated opening near the side of the short movable contact 12, during the closing process of the switch, the operating mechanism 4 drives the short movable contact 12 to rotate, the insulating head cover 132 at the front end of the short movable contact 12 first contacts the upper surface of the second pressing plate 62, since one end of the first pressing plate 61 and the second pressing plate 62 is fixed at one end of the armature, the insulating head cover 132 drives the entire armature to rotate.

[0040] The movable contact device 1 contacts the second pressing plate 62 at a certain position during the closing movement, and then drives the second pressing plate 62 and the armature 51 to rotate together, when the movable contact device 1 is completely in contact with the static contact device 2, the first pressing plate 61 presses the upper end of the movable contact, therefore when the circuit is normally conducted, the movable contact is subjected to additional pressure provided by the first pressing plate 61. When the circuit appears short-circuit current, the magnetic attraction force generated by the closed magnetic circuit formed by the armature 51 and the magnetic yoke 52 can beat the short movable contact 12 faster and more quickly, and reapply pressure to improve short-circuit resistance.

[0041] In the embodiment, the second static contact 22 is arranged at one side of the static contact device 2, the opening and closing of the long movable contact 13 and the second static contact 22 and the arc extinguishing device 3 are arranged at one side of the static contact device 2, which can maximize the distance adjustment between the phase-to-phase arc extinguishing devices, preventing the risk of phase-to-phase arc short circuit. The short movable contact 12 and the first static contact 21 will not generate arc, so the arc extinguishing device does not need to be arranged in front of the short movable contact 12, and the arc is generated from the long movable contact 13, so the arc extinguishing device is arranged in front of the long movable contact 13.

[0042] In other embodiments, the second static contact 22 can also be arranged in the middle of the static contact device 2, and the arrangement position of the second static contact 22 can be adaptively adjusted according to different needs of the switch.

[0043] Please refer to Fig. 4 and Fig. 5, the insulating shell at least includes the base 7 and the cover 8, the base 7 and the cover 8 are buckled to form a space for accommodating the movable contact device 1, the static contact device 2, the arc extinguishing device 3, the operating mechanism 4 and the electromagnet mechanism 5, the cover 8 above the static contact device 2 is sunken, and the sunken area is provided with the electric device 9, the electric device 9 drives the operating mechanism 4 to perform the opening and closing work and further drives the movable contact device 1 to act to perform the electrical connection and disconnection. The sunken area of the cover 8 of the application is provided for accommodating the electric device, so that the electric device 9 only occupies part of the switch body space, greatly improves the space utilization rate of the switch body, and at the same time also meets the installation requirement of small volume of the cabinet.

[0044] Please refer to Fig. 1 and Fig. 6, the arc extinguishing device 6 includes a plurality of stacked arc extinguishing grid pieces 61, the baffle plates 62 at both ends of the arc extinguishing grid pieces, and the insulating pieces 63 connected with the baffle plates at both ends, the baffle plates 62 are used for fixing both ends of the arc extinguishing grid pieces, the arc extinguishing device 6 is formed into a hawk mouth type arc extinguishing chamber by stacking the plurality of arc extinguishing grid pieces 61, since the principle condition of arc extinguishing is that the total pressure drop of the arc is greater than the power supply voltage, in the case that the electric field intensity of the arc and the arc length are unchanged, increasing the near pole pressure drop can increase the total pressure drop of the arc; the arc is cut by the arc extinguishing grid pieces 61, each short arc segment will have a near pole pressure drop, so the more the number of the arc segments is, the higher the near pole pressure drop is, which is more conducive to extinguishing the arc, under high voltage condition, by increasing the number of the arc extinguishing chamber grid pieces 61, the high voltage arc is divided into more segments, which is more conducive to extinguishing the arc, under normal atmospheric pressure, taking the near pole pressure drop of the iron grid piece as an example, the near pole pressure drop is 20-25V, at least 50 pieces of grid pieces form at least 50 layers in an arc extinguishing chamber, and two arc extinguishing chambers are connected in series for a two-pole switch, so that the near pole pressure drop of the arc can reach 2000-2500V, which greatly improves the reliability of extinguishing the high voltage arc. In the opening process of the switch, the long movable contact 13 is deeply inserted into the arc extinguishing device 6, which is conducive to quickly extinguishing the arc generated when the long movable contact 13 is separated from the second static contact point 22, so as to bear the high voltage arc breaking function, so that the product not only meets the high voltage arc breaking requirement, but also meets the high short time withstand performance requirement.

[0045] Please refer to FIG. 7, FIG. 8 and FIG. 9, the application provides another embodiment of a short-time high-resistance current switch of at least two levels, which is different from the above-mentioned embodiment in that the linkage device has a different structure, and the linkage device includes at least two connecting rods. In this embodiment, the linkage device 6 includes a first connecting rod 601 rotatably connected to the front end of the short movable contact 12, a second connecting rod 602 rotatably connected to the first connecting rod 601, and a fixed plate 603 fixed above the armature 51. The other end of the second connecting rod 602 is rotatably connected to the fixed plate 603. The first connecting rod 601 is provided with two connecting rods, which are respectively located on the two sides of the short movable contact 12. The second connecting rod 602 is provided with two connecting rods, which are respectively located on the two sides of the upper end of the fixed plate 603. The upper end of the fixed plate 603 on the two sides is provided with a receiving groove, and the second connecting rod 602 is arranged in the receiving groove. The two sides of the receiving groove are provided with through holes, and the two second connecting rods 602 on the two sides are connected by a shaft passing through the through holes of the two side walls of the receiving groove.

[0046] The end of the short movable contact 12 is provided with a limiting portion 120 for limiting the rotation of the first connecting rod 601. The limiting portion 120 is arranged adjacent to the upper rear of the rotation connection between the first connecting rod 601 and the short movable contact 12. When the short movable contact 12 moves to a certain position, the end of the first connecting rod 601 abuts against the limiting portion 120. As the short movable contact 12 continues to move, the first connecting rod 601 is driven to move towards the armature 51 and pushes the second connecting rod 602 to rotate forward until the second connecting rod 602 or the first connecting rod 601 abuts against the fixed plate 603. At this time, the short movable contact 12 continues to move, driving the first connecting rod 601, the second connecting rod 602 and the fixed plate 603 to move synchronously. Since the fixed plate 603 is fixedly connected to the armature 51, the movement of the fixed plate 603 can drive the armature 51 to move, thereby realizing the movement of the short movable contact 12 driving the movement of the armature 51.

[0047] The structure of the linkage device 1, the fixed contact device 2, the arc extinguishing device 3, the operating mechanism 4, the electromagnet mechanism 5 and the electric drive device in the short-time high-resistance current switch of at least two levels provided by the application is compact, realizing the small size of the switch. By arranging two sets of contact structures cooperating with the arc extinguishing device 3 and the electromagnet mechanism 5, rapid arc extinguishing under high voltage and contact repulsion protection under large short-circuit current are realized, which not only meets the high short-time resistance performance requirement of the energy storage industry, but also meets the performance requirement of the PV2 use category of the photovoltaic industry.

[0048] The application can be implemented in other specific forms without departing from the spirit and essential characteristics thereof. The current embodiments are regarded as exemplary rather than limiting, the scope of the application is defined by the appended claims rather than the above description, and all modifications falling within the meaning and equivalent of the claims are included in the scope of the application.

Claims

1. A switch of at least two poles, said switch comprising at least an insulating housing and elements arranged inside, said internal elements comprising at least: The moving contact device, the static contact device, the operating mechanism, and the electromagnet mechanism; The moving contact device and the electromagnet mechanism are connected by a linkage device.

2. A switch having at least two poles according to claim 1, wherein, The operating mechanism drives part or all of the moving contact device to move up and down to connect or disconnect the static contact device; part or all of the moving contact device drives part of the electromagnet mechanism to move downward or up and down.

3. A switch having at least two poles according to claim 1, wherein, The moving contact device is composed of a long moving contact and a short moving contact.

4. A switch having at least two poles according to claim 3, wherein, The short moving contact and the electromagnet mechanism are connected by a linkage device.

5. A switch having at least two poles according to claim 3, wherein, When a short-circuit large current occurs in the circuit of the switch in the on state, part of the electromagnet mechanism is arranged above the short moving contact.

6. A switch having at least two poles according to claim 3, wherein, The electromagnet mechanism is arranged on the static contact device and at the front end of the short moving contact.

7. A switch having at least two poles according to claim 1, wherein, The electromagnet mechanism is composed of at least a magnetic yoke and a moving armature arranged above the magnetic yoke to form a closed magnetic circuit with the magnetic yoke.

8. A switch having at least two poles according to claim 7, wherein, When a short-circuit large current occurs in the circuit of the switch in the on state, the armature is above the short moving contact, and the electromagnetic force generated by the armature is applied to the static contact device through the short moving contact.

9. A switch having at least two poles according to claim 3 wherein, An insulating head cover is arranged on the short moving contact, and the insulating head cover is always between the linkage devices during the movement of the linkage device driving the armature.

10. A switch having at least two poles according to claim 7, wherein, The linkage device includes at least two connecting rods, which are movably connected, at least one end of at least one connecting rod is directly or indirectly connected with the moving contact device, and at least one end of at least one connecting rod is directly or indirectly connected with the armature, the moving contact device drives the at least two connecting rods to move the armature up and down.

11. A switch having at least two electrodes according to claim 1, wherein, The contact closing contact surface of the moving contact device and the static contact device is arranged horizontally relative to the length direction of the switch or is inclined towards the rotation center of the moving contact device.

12. A switch having at least two electrodes according to claim 1, wherein, An arc extinguishing device is arranged beside the electromagnet mechanism.

13. A switch having at least two electrodes according to claim 3, wherein, The long moving contact is arranged in pairs with the arc extinguishing device, and the arc extinguishing device is arranged in front of the long moving contact.

14. A switch having at least two poles according to claim 1 or 2, wherein, In any pole of the switch, the static contact device includes a first static contact point close to the operating mechanism and a second static contact point away from the operating mechanism, and the first static contact point is arranged lower than the second static contact point.

15. A switch having at least two electrodes according to claim 14, wherein, The moving contact above the first static contact point is a short moving contact, and the moving contact above the second static contact point is a long moving contact.

16. A switch having at least two electrodes as claimed in claim 15, wherein, When the switch is closed, the long moving contact contacts the second static contact point earlier than the short moving contact contacts the static contact device.

17. A switch having at least two electrodes as claimed in claim 15, wherein, The long moving contact separates from the second static contact point later than the short moving contact separates from the static contact device.

18. A switch having at least two poles according to claim 12 or 13, wherein, The arc extinguishing device is a structure of metal grid spacers stacked in layers.

19. A switch having at least two electrodes as claimed in claim 18, wherein, The number of layers of the metal grid spacers stacked in layers is at least 50 layers or pieces.

Images