Non-instantaneous arc protection auxiliary switch
The non-momentary auxiliary switch design addresses electrical arcs in single-spring switches by using a push rod to move multiple spring pairs, ensuring reliable contact transitions and reducing production costs.
Patent Information
- Application Number
- CN202422330016.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-24
AI Technical Summary
Existing instantaneous auxiliary switches generate arcs when the reed is disconnected from the static contact, affecting contact reliability and stability.
The push rod is used to drive the movement of the two sets of reeds, which achieve the normally closed and normally open states respectively. The compression spring and insulating pad are used to isolate the reeds to avoid arcing.
It improves the reliability of contact on-off, reduces the impact of voltage induction, supports multiple on-off, has good anti-vibration and impact performance, and has low production costs.
Smart Images
Figure CN223108722U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of auxiliary switches, in particular to a non-instantaneous arc-proof auxiliary switch. Background Art
[0002] An auxiliary switch is a part of the main switch and is configured in power equipment such as high-voltage or medium-voltage circuit breakers and disconnectors to function as the opening, closing, signal control, and interlock protection of the secondary control circuit. At the same time, it can also be used as a combined switch and a transfer switch. The reason why the auxiliary switch has the word "auxiliary" in its name is that it is not an independent switch. It is a carrier for realizing the auxiliary breaking, closing, and interlock functions in the control system. The auxiliary switch is mainly used for auxiliary control in high-power electrical equipment and requires the auxiliary switch to provide N groups of reliably contacted on / off circuits.
[0003] Most auxiliary switches adopt the instantaneous deformation of the reed. The reed changes from contacting one static contact to contacting another static contact to realize the change from the normally closed state to the normally open state. However, an arc will be generated when the reed disconnects from the static contact, and the arc will affect the deformation of the reed. Summary of the Utility Model
[0004] In view of this, the utility model provides a non-instantaneous arc-proof auxiliary switch to solve the problem that the reed of the existing instantaneous auxiliary switch is affected by the arc.
[0005] The utility model provides a non-instantaneous arc-proof auxiliary switch, comprising:
[0006] A housing;
[0007] A push rod, arranged in the housing, the push rod is adapted to move along its own axial direction, a plurality of through grooves are arranged at intervals along the axial direction of the push rod, and one end of the push rod in the axial direction is adapted to be pressed;
[0008] A reset assembly, used to reset the push rod when the force pressing the push rod disappears;
[0009] Multiple sets of reed components, with one set of the reed components correspondingly arranged at each of the through grooves. The reed components include a first reed, a second reed, a compression spring, and an insulating pad. The first reed and the second reed are distributed along the axial direction of the push rod. The middle sections of the first reed and the second reed are both located within the through groove. Both ends of the first reed and the second reed in the length direction are located on both sides of the push rod. The inner wall of one side of the through groove along the axial direction of the push rod is adapted to generate a pressure on the second reed towards the first reed when the auxiliary switch is in the closed state. The inner wall of the other side of the through groove along the axial direction of the push rod is adapted to generate a pressure on the first reed towards the second reed when the auxiliary switch is in the open state. The axis of the compression spring is parallel to the axis of the push rod, and both ends of the compression spring respectively abut against the first reed and the second reed. The insulating pad is located between the first reed and the second reed for isolating the first reed and the second reed;
[0010] Moving contacts are provided at both ends of the first reed and the second reed in the length direction;
[0011] Terminal pieces, adapted to connect wires. The terminal pieces are connected with static contacts, and the static contacts are used to contact the moving contacts.
[0012] Optionally, the insulating pad is fixed on the first reed or the second reed. One end of the compression spring abuts against the insulating pad, and the other end abuts against the first reed or the second reed.
[0013] Optionally, the insulating pad is provided with a first limiting protrusion, and one end of the compression spring is sleeved on the first limiting protrusion; the first reed or the second reed is provided with a second limiting protrusion, and the other end of the compression spring is sleeved on the second limiting protrusion.
[0014] Optionally, four static contacts are correspondingly arranged for each set of the reed components. Two of the static contacts are adapted to contact the moving contacts on the first reed when the push rod is in the initial state, and the remaining two static contacts are adapted to contact the moving contacts on the second reed after the push rod is pressed.
[0015] Optionally, the reset component includes a reset spring. The push rod passes through the reset spring. A first step is provided on the housing, and a second step is provided on the push rod. One end of the reset spring abuts against the first step, and the other end abuts against the second step.
[0016] Optionally, a third step is provided at the end of the push rod far from the pressing end, and a fourth step is provided on the housing for blocking the third step.
[0017] Optionally, on both sides of the push rod on the housing, there is a rib each. The space between the two ribs is used to accommodate the push rod, the reed assembly, the stationary contact, and the moving contact. On the side of the rib facing away from the push rod, there are a plurality of partitions. The partitions are distributed along the length direction of the rib, and the adjacent partitions enclose a terminal piece mounting groove. A part of the terminal piece is located in the terminal piece mounting groove, and the rest passes through to the other side of the rib.
[0018] Optionally, the housing includes a bottom plate and a cover plate. The push rod, the reset assembly, the reed assembly, the moving contact, the stationary contact, the terminal piece, and the rib are all arranged on the bottom plate. The cover plate is used to cover the space between the two ribs and the terminal piece mounting groove.
[0019] Optionally, a magnet is embedded and fixed on the housing, and the magnet is opposite to the stationary contact that is connected to the circuit in the normally closed state.
[0020] Optionally, the number of magnets is two, and the two magnets are respectively opposite to the two stationary contacts in the circuit with the largest current.
[0021] The technical solution of the present utility model has the following advantages:
[0022] 1. For the non-instantaneous auxiliary switch proposed in this application, since the push rod drives two groups of reeds to move to achieve normally closed and normally open states respectively, it avoids the situation of arc interference caused by the disconnection between a single reed and the stationary contact in the instantaneous auxiliary switch; it reduces the inductive influence from the high-voltage end to the low-voltage end when passing different-voltage loads in the normally closed state and the normally open state.
[0023] 2. Due to structural reasons and production assembly effects, it is very difficult for an instantaneous auxiliary switch to achieve more than two groups of normally open and two groups of normally closed. However, the non-instantaneous auxiliary switch proposed in this application can achieve three groups of normally open, three groups of normally closed, or even more than three groups, which can better meet the user's need for multi-channel on-off.
[0024] 3. For the non-instantaneous auxiliary switch proposed in this application, since two reeds and a compression spring for pressing the reeds are adopted, the contact pressure between the moving contact and the stationary contact is much larger than that of the instantaneous auxiliary switch, greatly improving the reliability of contact on-off.
[0025] 4. The non-instantaneous auxiliary switch proposed in this application has a large over-travel distance, which is convenient for users to debug.
[0026] 5. The non-instantaneous auxiliary switch proposed in this application has good anti-vibration and anti-shock performance, and is especially suitable for occasions with fast operating speeds.
[0027] 6. The non-instantaneous auxiliary switch proposed in this application has a simple structure and is easy to assemble. Therefore, the production cost of the product is low, and the production process is simpler than that of the instantaneous auxiliary switch, which is convenient for production. Description of the Drawings
[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.
[0029] Figure 1 is the front view of the non-instantaneous arc-proof auxiliary switch in the embodiment;
[0030] Figure 2 is Figure 1 a schematic diagram after hiding the cover plate;
[0031] Figure 3 is Figure 2 the enlarged view of part A in
[0032] Figure 4 is the side view of the non-instantaneous arc-proof auxiliary switch in the embodiment.
[0033] In the figure: housing 1, bottom plate 1a, cover plate 1b, first step 11, fourth step 12, rib 13, partition 14, wire piece installation groove 15, push rod 2, through groove 20, second step 21, third step 22, reed assembly 3, first reed 31, second reed 32, compression spring 33, insulating pad 34, first limit convex block 341, second limit convex block 342, moving contact 4, connection piece 5, static contact 6, return spring 7, magnet 8. Specific Embodiments
[0034] The following will combine the drawings to describe in detail specific embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all embodiments. Based on the description of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.
[0035] Unless otherwise clearly defined and limited, terms such as "set", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.
[0036] The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is customarily placed during use. It is only for the convenience of description and to simplify the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present utility model.
[0037] The terms "first", "second", "third", etc. are only used to distinguish elements with similar attributes, rather than indicating or implying relative importance or a specific order.
[0038] The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion. In addition to the listed elements, it may also include other elements not specifically listed.
[0039] Please refer to Figure 1 and Figure 2 , an embodiment of the present utility model provides a non-instantaneous arc-proof auxiliary switch, which includes a housing 1, and a push rod 2, a reset assembly, a reed assembly 3, a moving contact 4, a static contact 6 and a connection piece 5 installed on the housing 1.
[0040] Please refer to Figure 2 , the push rod 2 is in the shape of a straight and long column and is arranged inside the housing 1; the housing 1 has a groove structure for guiding the moving direction of the push rod 2, and the side wall of the push rod 2 is in sliding contact with the inner wall of the groove structure. The groove structure enables the push rod 2 to only move along its own axial direction inside the housing 1. One end (lower end) of the axial direction of the push rod 2 extends out of the housing 1, and this end is the pressing end, which moves towards the inside of the housing 1 when a force is applied to it.
[0041] The function of the reset assembly is to reset the push rod 2 when the force applied to the push rod 2 disappears. Exemplarily, please refer to Figure 2 , the reset assembly includes a reset spring 7. The push rod 2 passes through the reset spring 7. The housing 1 is provided with a first step 11, and the push rod 2 is provided with a second step 21. One end of the reset spring 7 abuts against the first step 11, and the other end abuts against the second step 21; a third step 22 is provided at the end of the push rod 2 away from the pressing end, and the housing 1 is provided with a limiting groove for accommodating the third step 22. The limiting groove forms a fourth step 12 on the housing 1, and the fourth step 12 is used to block the third step 22; when the third step 22 contacts and is blocked by the fourth step 12, the reset spring 7 is in a compressed state. At this time, the reset spring 7 has a downward thrust on the push rod 2, and this thrust keeps the third step 22 and the fourth step 12 in contact. Only by pressing the push rod 2 upward can the third step 22 move upward and separate from the fourth step 12.
[0042] Please refer to Figure 2 When the push rod 2 is not under pressing force, the push rod 2 is in its initial state, and at this time the auxiliary switch is in the normally closed state; when the push rod 2 is pressed so that the push rod 2 moves to a certain extent, the auxiliary switch is in the normally open state; when the pressing force disappears, the reset component automatically retracts the push rod 2 back to its initial state.
[0043] Please refer to Figure 2 The number of the reed assemblies 3 is not limited. In this embodiment, the auxiliary switch uses three reed assemblies 3. A plurality of through grooves 20 are arranged at intervals along the axial direction of the push rod 2. The through grooves 20 penetrate through the opposite sides of the side wall of the push rod 2. The through grooves 20 have a top wall and a bottom wall perpendicular to the axis of the push rod 2; the number of the reed assemblies 3 corresponds to the number of the through grooves 20, and a set of reed assemblies 3 is correspondingly arranged at each through groove 20. Each set of reed assemblies 3 includes a first reed 31, a second reed 32, a compression spring 33 and an insulating pad 34, wherein the compression spring 33 and the insulating pad 34 are both located between the first reed 31 and the second reed 32. The first reed 31 and the second reed 32 are distributed along the axial direction of the push rod 2. The middle sections of the first reed 31 and the second reed 32 are both located in the through groove 20, and both ends of the first reed 31 and the second reed 32 in the length direction extend out of the through groove 20 and extend to both sides of the push rod 2. A moving contact 4 is fixed at each end of the first reed 31 and the second reed 32 in the length direction. Correspondingly, in the direction parallel to the axis of the push rod 2, a static contact 6 is arranged on each side of the moving contact 4.
[0044] Please refer to Figure 2 The axis of the compression spring 33 is parallel to the axis of the push rod 2, and both ends of the compression spring 33 respectively abut against the first reed 31 and the second reed 32, which can be in direct contact or indirectly contact through the insulating pad 34; the insulating pad 34 is pressed on the first reed 31 by the compression spring 33, or the insulating pad 34 can be directly fixed on the first reed 31; one end of the compression spring 33 abuts against the insulating pad 34, and the other end abuts against the second reed 32; or the insulating pad 34 can be fixed on the second reed 32, and one end of the compression spring 33 abuts against the insulating pad 34, and the other end abuts against the first reed 31. The fixing position of the insulating pad 34 is not limited in this embodiment, as long as it satisfies that no matter how much the compression spring 33 is compressed, the insulating pad 34 can separate the first reed 31 and the second reed 32, so as to avoid the first reed 31 and the second reed 32 from contacting and changing the resistance of the reed.
[0045] Furthermore, please refer to Figure 3, a first limiting protrusion 341 protrudes from the insulating pad 34, and a second limiting protrusion 342 protrudes from the first reed 31 or the second reed 32; one end of the compression spring 33 is sleeved on the first limiting protrusion 341, and the other end is sleeved on the second limiting protrusion 342. The setting of the limiting protrusion can avoid fixedly connecting the end of the compression spring 33 with the reed and the insulating pad 34, which can reduce the assembly cost and assembly difficulty; the function of the limiting protrusion is to prevent the end of the compression spring 33 from moving radially, resulting in the compression spring 33 being distorted and detached from the reed or the insulating pad 34 when the compression spring 33 is compressed.
[0046] Please refer to Figure 3 , the inner wall of one side (such as the upper side) of the through groove 20 along the axial direction of the push rod 2 is adapted to generate a pressure on the second reed 32 towards the first reed 31 when the auxiliary switch is in the normally closed state, and compress the compression spring 33, so as to press the moving contacts 4 at both ends of the first reed 31 against the lower static contacts 6 by means of the elasticity of the compression spring 33; the inner wall of the other side (such as the lower side) of the through groove 20 along the axial direction of the push rod 2 is adapted to generate a pressure on the first reed 31 towards the second reed 32 when the auxiliary switch is in the normally open state, and compress the compression spring 33, so as to press the moving contacts 4 at both ends of the second reed 32 against the upper static contacts 6 by means of the elasticity of the compression spring 33.
[0047] Please refer to Figure 2 , when the push rod 2 is in the initial state, the third step 22 contacts the fourth step 12, and both the compression spring 33 and the return spring 7 are in the compressed state; the downward thrust of the return spring 7 on the second step 21 keeps the third step 22 in contact with the fourth step 12; the upper inner wall of the through groove 20 compresses the compression spring 33 downward through the second reed 32, and the compression spring 33 presses the first reed 31 downward, so that the moving contacts 4 at both ends of the first reed 31 can stably contact the lower static contacts 6 with pressure. At this time, there is still a gap between the first reed 31 and the lower inner wall of the through groove 20.
[0048] Please refer to Figure 2, when the push rod 2 is pressed upward, the third step 22 moves upward and separates from the fourth step 12. The gap between the first reed 31 and the lower inner wall of the through groove 20 gradually becomes smaller. The downward pressure of the push rod 2 on the compression spring 33 gradually decreases, causing the compression spring 33 to gradually recover to its original length state. The pressure between the static contacts 6 at both ends of the first reed 31 and the lower moving contact 4 also gradually becomes smaller. Until the lower inner wall of the through groove 20 moves upward to contact the first reed 31, the push rod 2 generates an upward pressure on the first reed 31, causing the static contacts 6 at both ends of the first reed 31 to separate from the lower moving contact 4 and disconnect. Instantaneously, an arc is probabilistically generated between the static contact 6 and the moving contact 4, and the moving contact 4 will be attracted downward to the static contact 6; as the push rod 2 continues to move upward, the distance between the first reed 31 and the lower static contact 6 gradually increases, but there is still a risk that the two ends of the first reed 31 will bend and deform under the attraction of the arc, resulting in the moving contact 4 at both ends of the first reed 31 contacting the lower static contact 6 again; as the push rod 2 continues to move upward, before the moving contact 4 at both ends of the second reed 32 contacts the upper static contact 6, the length of the compression spring 33 remains unchanged. When the moving contact 4 at both ends of the second reed 32 contacts the upper static contact 6, the auxiliary switch switches to the normally open state. Subsequently, a gap is formed between the upper inner wall of the through groove 20 and the second reed 32 and the gap becomes larger and larger. At the same time, the compression spring 33 is compressed by the upward moving push rod 2, and the compression spring 33 presses the moving contact 4 at both ends of the second reed 32 against the upper static contact 6, enabling the moving contact 4 to stably contact the upper static contact 6 with pressure.
[0049] Please refer to Figure 2 , one end of the connection piece 5 is connected to the wire, and the other end extends into the housing 1. The end of the connection piece 5 extending into the housing 1 is fixed and does not move, and a static contact 6 is fixed at this end. Each reed assembly 3 is correspondingly provided with four connection pieces 5, and a static contact 6 is fixed on each connection piece 5, for a total of four static contacts 6. Two of the static contacts 6 are adapted to contact the moving contact 4 on the first reed 31 when the push rod 2 is in the initial state, and the remaining two static contacts 6 are adapted to contact the moving contact 4 on the second reed 32 after the push rod 2 is pressed.
[0050] Further, please refer to Figure 4 and Figure 2 , the housing 1 is detachably connected by a bottom plate 1a and a cover plate 1b, and screw connection can be used. The above-mentioned push rod 2, return spring 7, reed assembly 3, moving contact 4, static contact 6, and connection piece 5 are all arranged on the bottom plate 1a; please refer to Figure 2, on the surface of the bottom plate 1a facing the cover plate 1b, two protruding strips 13 are further provided in a protruding manner. The two protruding strips 13 are respectively located on both sides of the push rod 2 and are symmetrical about the push rod 2. Other structures also protrude on the surface of the bottom plate 1a, and together with the two protruding strips 13, they enclose a groove structure. After the cover plate 1b covers the groove structure, a sealed space is formed. The reed assembly 3, the moving contact 4, the static contact 6, and most of the push rod 2 are located in this space. The wiring piece 5 passes through the protruding strip 13 and extends into this space. A plurality of partitions 14 are integrally formed on the side of the protruding strip 13 facing away from the push rod 2. All the partitions 14 are distributed at equal intervals along the length direction of the protruding strip 13. The adjacent partitions 14 and the protruding strip 13 enclose a wiring piece installation groove 15. A part of the wiring piece 5 is located in the wiring piece installation groove 15, and the rest passes to the other side of the protruding strip 13. The cover plate 1b also covers the wiring piece installation groove 15. The wiring piece installation groove 15 only has a notch at a position far from the protruding strip 13 for the wire to lead out.
[0051] Further, please refer to Figure 1 , an embedding groove is provided on the housing 1, and a fixed magnet 8 is embedded and fixed in the embedding groove by means of gluing or interference fit. The magnet 8 is opposite to the static contact 6 that is connected to the circuit in the normally closed state. The number of magnets 8 is two, and the two magnets 8 are respectively opposite to the two static contacts 6 in the circuit with the largest current. The two magnets 8 are a group, or a group of magnets 8 can be provided corresponding to each reed assembly 3. However, to reduce the cost of the auxiliary switch, generally, magnets 8 are provided at the large-current static contacts 6, and no magnets 8 are provided at other general-current static contacts 6.
[0052] In summary, the auxiliary switch proposed in this embodiment has the following advantages:
[0053] For the non-instantaneous auxiliary switch proposed in this application, since the push rod is used to drive two groups of reeds to move respectively to achieve normally closed and normally open states, it avoids the situation of arc interference caused by the disconnection of the static contact when using one reed in the instantaneous auxiliary switch; it reduces the inductive influence of the high-voltage end on the low-voltage end when passing through loads with different voltages in the normally closed state and the normally open state.
[0054] Due to structural reasons and the influence of production and assembly, it is very difficult for the instantaneous auxiliary switch to achieve more than two groups of normally open and two groups of normally closed. However, the non-instantaneous auxiliary switch proposed in this application can achieve three groups of normally open, three groups of normally closed, or even more than three groups, which can better meet the user's need for multi-way on-off.
[0055] For the non-instantaneous auxiliary switch proposed in this application, since two reeds and the compression spring pressing the reeds are used, the contact pressure between the moving contact and the static contact is much larger than that of the instantaneous auxiliary switch, greatly improving the reliability of contact on-off; the over-travel distance is large, which is convenient for users to debug; it has good anti-vibration and anti-impact performance, and is especially suitable for occasions with fast operating speeds; because the structure is simple and easy to assemble, the product production cost is low, and the production process is simpler than that of the instantaneous auxiliary switch, which is convenient for production.
[0056] The above are only specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model.
Claims
1. A non-instantaneous arc-proof auxiliary switch, characterized in that, Comprising: A housing; A push rod disposed within the housing, the push rod being adapted to move along its own axial direction, a plurality of through slots being provided at intervals along the axial direction of the push rod, and one axial end of the push rod being adapted to be pressed; A reset assembly for resetting the push rod when the force pressing the push rod disappears; Multiple sets of reed assemblies, with one set of the reed assemblies corresponding to each through slot. The reed assembly includes a first reed, a second reed, a compression spring, and an insulating pad. The first reed and the second reed are distributed along the axial direction of the push rod. The middle sections of the first reed and the second reed are both located within the through slot. The two ends of the first reed and the second reed in the length direction are both located on both sides of the push rod. The inner wall of one side of the through slot along the axial direction of the push rod is adapted to exert a pressure on the second reed towards the first reed when the auxiliary switch is in the closed state. The inner wall of the other side of the through slot along the axial direction of the push rod is adapted to exert a pressure on the first reed towards the second reed when the auxiliary switch is in the open state. The axis of the compression spring is parallel to the axis of the push rod, and the two ends of the compression spring respectively abut against the first reed and the second reed. The insulating pad is located between the first reed and the second reed for isolating the first reed and the second reed; A moving contact disposed at the two ends of the first reed and the second reed in the length direction; A terminal piece adapted to connect an electric wire, the terminal piece being connected with a static contact, and the static contact being used to contact the moving contact.
2. The non-instantaneous arc-proof auxiliary switch according to claim 1, wherein, The insulating pad is fixed on the first reed or the second reed, one end of the compression spring abuts against the insulating pad, and the other end abuts against the first reed or the second reed.
3. The non-instantaneous arc-proof auxiliary switch according to claim 2, characterized in that, The insulating pad is provided with a first limiting protrusion, and one end of the compression spring is sleeved on the first limiting protrusion; the first reed or the second reed is provided with a second limiting protrusion, and the other end of the compression spring is sleeved on the second limiting protrusion.
4. The non-instantaneous arc protection auxiliary switch according to claim 1, wherein Each set of the reed assemblies corresponds to four static contacts. Two of the static contacts are adapted to contact the moving contact on the first reed when the push rod is in the initial state, and the remaining two static contacts are adapted to contact the moving contact on the second reed after the push rod is pressed.
5. The non-instantaneous arc protection auxiliary switch according to claim 1, wherein The reset assembly includes a reset spring, the push rod passes through the reset spring, the housing is provided with a first step, the push rod is provided with a second step, one end of the reset spring abuts against the first step, and the other end abuts against the second step.
6. The non-instantaneous arc-proof auxiliary switch according to claim 5, characterized in that, A third step is provided at the end of the push rod away from the pressing end, and a fourth step is provided on the housing for blocking the third step.
7. The non-instantaneous arc-proof auxiliary switch according to claim 1, characterized in that, On the housing, there is a convex strip on each side of the push rod. The space between the two convex strips is used to accommodate the push rod, the reed assembly, the static contact, and the moving contact; on the side of the convex strip facing away from the push rod, there are a plurality of partitions distributed along the length direction of the convex strip, and adjacent partitions enclose a terminal piece installation groove; a part of the terminal piece is located within the terminal piece installation groove, and the remaining part passes through to the other side of the convex strip.
8. The non-instantaneous arc-proof auxiliary switch according to claim 7, characterized in that, The housing includes a bottom plate and a cover plate. The push rod, the reset assembly, the reed assembly, the moving contact, the static contact, the connection piece and the convex strip are all arranged on the bottom plate. The cover plate is used to cover the space between the two convex strips and the connection piece mounting groove.
9. The non-instantaneous arc protection auxiliary switch according to any one of claims 1-8, characterized in that, A magnet is fixedly embedded on the housing, and the magnet faces the static contact that is connected to the circuit in the normally closed state.
10. The non-instantaneous arc-proof auxiliary switch according to claim 9, characterized in that, The number of the magnets is two, and the two magnets respectively face the two static contacts in the circuit with the largest current.