CN111710561B - Self-locking contactor and operation method - Google Patents
Self-locking contactor and operation method Download PDFInfo
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- CN111710561B CN111710561B CN202010454879.2A CN202010454879A CN111710561B CN 111710561 B CN111710561 B CN 111710561B CN 202010454879 A CN202010454879 A CN 202010454879A CN 111710561 B CN111710561 B CN 111710561B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/16—Magnetic circuit arrangements
- H01H50/18—Movable parts of magnetic circuits, e.g. armature
- H01H50/32—Latching movable parts mechanically
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/44—Magnetic coils or windings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/64—Driving arrangements between movable part of magnetic circuit and contact
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- Electromagnetism (AREA)
- Electromagnets (AREA)
Abstract
The invention discloses a self-locking contactor and an operation method, comprising the following steps: the fixed part is fixedly provided with two spaced static contacts; the two ends of the movable touch plate are fixed with two movable contacts corresponding to the static contacts; the mechanical self-locking part is arranged on the fixed part in a lifting mode, the movable contact plate is fixed on the mechanical self-locking part, the mechanical self-locking part drives the movable contact plate to be in a self-locking state after rising, and the mechanical self-locking part drives the movable contact plate to be in a self-locking state after falling. The problem of present contactor rely on depending on electricity to maintain stable state, the contact state that exists the contact is unstable is solved.
Description
Technical Field
The invention belongs to the technical field of power electrical appliances, and relates to a self-locking contactor and an operation method.
Background
With the development of electric equipment, the application of electric equipment is more and more, high-power electric equipment is more and more, most domestic used voltages at present have 220V and 380V, and for the voltage in a constant state, high-power output needs to be obtained, and then the high-power output needs to be obtained by increasing current; a contactor is widely used as an electric power appliance for controlling an electric power device, and the essence of the contactor is to realize the control of the power-on state of the electric power device by depending on the contact or separation state of a movable contact and a fixed contact, wherein under the condition of using large current, the contact state of the contact determines the power-on state of the controlled electric power device, and meanwhile, if the contact of the contact is unstable and has a gap, the temperature rise of air in the gap can burn the contact; at present, the stability of the contact of the contactor is maintained by electricity, and the contact state of the contact is unstable because the voltage or the current in the circuit fluctuates in some cases.
Disclosure of Invention
In order to solve the technical problem, the invention provides a self-locking type contactor and an operation method.
The invention is realized by the following technical scheme.
The invention provides a self-locking contactor, comprising: the fixed part is fixedly provided with two spaced static contacts;
the two ends of the movable touch plate are fixed with two movable contacts corresponding to the static contacts;
the mechanical self-locking part is arranged on the fixed part in a lifting mode, the movable contact plate is fixed on the mechanical self-locking part, the mechanical self-locking part drives the movable contact plate to be in a self-locking state after rising, and the mechanical self-locking part drives the movable contact plate to be in a self-locking state after falling. The problem of present contactor rely on depending on electricity to maintain stable state, the contact state that exists the contact is unstable is solved.
The fixing part comprises a seat plate and a shell, and the seat plate is fixed in the shell; the mechanical self-locking part comprises a transmission plate, a connecting rod, a gear, a rack and a retaining spring, wherein one end of the rack can slidably penetrate through the seat plate, the other end of the rack is meshed with the gear, one side, close to the rack, of the gear is rotatably and eccentrically fixed on the shell, two ends of the connecting rod are respectively rotatably hinged with the other end of the gear and one end of the transmission plate, the connecting rod inclines from the gear to the rack, the other end of the transmission plate is fixed with the bottom of the movable contact plate in an insulating mode, two ends of the retaining spring are respectively fixedly connected with the bottom end of the rack and the other end of the gear, and a two-point connecting line of the retaining spring is located below a connecting line between a connecting point of the connecting rod and the gear and a mounting point of the gear.
The thrust mechanism comprises a coil, a coil rack, an iron core and a coil seat, wherein the coil is wound on the outer periphery of the coil rack arranged in the coil seat, the slidable iron core is arranged on the inner side of the coil rack, and the iron core is electromagnetic pure iron; the rack penetrating through the seat plate penetrates through the coil seat and then is fixedly connected with the iron core;
an iron yoke positioned on top of the bobbin; the coil seat and the iron yoke are fixed at the lower end of the bottom surface of the seat plate.
The coil wiring terminal is also included, and the positive and negative electrode wires of the coil are respectively connected with the two coil wiring terminals fixed on the seat plate; the lead of the coil is convenient to be fixedly connected.
The coil is electrified to generate a magnetic field, the magnetic field passes through the coil rack and acts on the iron core, magnetic lines of force of the magnetic field pass through the iron core and the coil to form a closed state and are strengthened under the action of the iron yoke, the direction of the magnetic lines of force is determined by the direction of current according to the 'right-hand screw rule', and the iron core made of electromagnetic pure iron material moves towards the direction of the magnetic lines of force under the action of the magnetic force;
when the current of the coil is from top to bottom, the magnetic force of the magnetic field generated by the coil drives the iron core to drive the rack to move downwards (in the N direction); when the coil power supply is reversely connected, the magnetic field magnetic force generated by the coil drives the rack to move upwards (in the direction M), so that the rack can move upwards and downwards.
The transmission plate is fixedly connected with the plastic block fixed in the middle of the bottom of the movable contact plate; after the transmission plate is ensured to rise, the impact force of the contact between the two movable contact points and the two static contact points on the movable contact plate is uniformly borne, the deformation of the movable contact plate due to uneven stress is avoided, and the contact stability between the contact points is ensured.
The transmission plate penetrates through the bracket fixed on the shell; the support further guarantees that the driving plate does not take place the displacement when the connecting rod rotates with the pin joint, further guarantees to move the stable contact of contact and stationary contact.
The transmission plate, the connecting rod, the bracket, the gear, the retaining spring and the movable contact plate are two, and the number of the static contact and the number of the movable contact are two and are symmetrically arranged according to the central line of the rack.
The power supply contact posts penetrate through and are fixed on the seat plate and then are fixedly connected with the static contact points; the wire is connected with the stationary contact quickly through the power contact column.
The fixed part also comprises a cap cover, and the bottom of the hollow cap cover is fixedly connected with the top of the shell to form a closed space at the top of the shell to protect the power supply contact column.
The wire harness is concentrated through the wire sleeve and then enters the cap cover; the centralized wire harness is convenient to manage, and the condition that the wire harness is scattered is avoided.
The fixing plate is fixed at the bottom of the shell; the whole body is conveniently fixed through the fixing plate.
The invention relates to an operation method of a self-locking contactor, which comprises the following steps:
installation: the fixed plate is fixed on the electric equipment, so that the driving plate is always in a vertical ground center state under the self gravity;
switching on: in a normally open state, when the movable contact and the fixed contact are required to be in stable contact, control electricity enters a coil through a coil binding post, the current electrified by the coil is from top to bottom, magnetic force of a magnetic field generated by the coil enables an iron core to drive a rack to move downwards (in an N direction), the rack pushes a gear to eccentrically rotate, the gear rotates to drive a connecting rod to enable a transmission plate and a movable contact plate to lift upwards (in a P direction), at the moment, a spring is kept to move from the lower part to the upper part around a dead angle under the pushing of the rack, the movable contact and the fixed contact are in stable contact, and the leads of the power binding posts on the two fixed contacts are stably connected with a large current, even if the coil is electrically disconnected, the stable contact closed state is still kept under the action of reverse resistance of the spring, the gear and the rack;
disconnecting: when the contactor needs to be closed, the coil is reversely connected to enter the current direction of the coil, magnetic force of a magnetic field generated by the coil enables the iron core to drive the rack to move upwards (in the direction M), the rack drives the gear to eccentrically rotate, the gear drives the connecting rod to further drive the transmission plate to move downwards (in the direction Q), the movable contact plate drives the movable contact and the static contact to be separated, the contactor enters a normally open state, and even if the coil is electrically disconnected, a stable contact separation interval state is still kept under the action of reverse resistance of the spring, the gear and the rack.
The invention has the beneficial effects that: the coil drives the rack to drive the gear to rotate, so that the connecting line of two points of the spring is kept to bypass a dead angle which is collinear with the connecting line of the connecting rod and the connecting point of the rack to the mounting point of the gear, and the spring is moved above and below the connecting rod and the rack, and the movable contact and the static contact are always kept in a stable state of contact or separation under the action of reverse resistance of the spring, the gear and the rack, and the problem that the contact state of a contact is unstable because the existing contactor depends on electricity to maintain the stable state is solved.
Drawings
FIG. 1 is a front sectional view of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a top perspective view of the present invention;
in the figure: 1-a cap; 2-a seat board; 3-stationary contact; 4-a movable contact; 5-a bracket; 6-a coil; 7-a coil former; 8-iron core; 9-a coil holder; 10-fixing the plate; 11-coil terminals; 13-power contact posts; 14-a wire harness; 15-a wire sleeve; 16-iron yoke; 17-a housing; 18-a movable touch plate; 19-a plastic block; 20-a drive plate; 21-a connecting rod; 22-gear; 23-a rack; 24-retention spring.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
See fig. 1-3.
The invention relates to a self-locking contactor, which comprises: the fixed part is fixedly provided with two spaced static contacts 3 through an insulating layer;
the movable contact plate 18 and the movable contact 4, wherein two ends of the conductive movable contact plate 18 are fixed with the movable contacts 4 corresponding to the static contacts 3;
the mechanical self-locking part is arranged on the fixed part in a lifting mode, the movable contact plate 18 is fixed on the mechanical self-locking part, the mechanical self-locking part drives the movable contact plate 18 to be in a self-locking state after rising, and the mechanical self-locking part drives the movable contact plate 18 to be in a self-locking state after falling. The problem of present contactor rely on depending on electricity to maintain stable state, the contact state that exists the contact is unstable is solved.
The fixed part comprises a seat plate 2 and a shell 17, wherein the seat plate 2 is fixed in the hollow interior of the shell 17; the mechanical self-locking part comprises a transmission plate 20, a connecting rod 21, a gear 22, a rack 23 and a retaining spring 24, wherein one end of the rack 23 can slidably penetrate through a through hole of the seat plate 2, the other end of the rack 23 is meshed with the gear 22, one end of the gear 22 close to the rack 23 is rotatably and eccentrically fixed on the hollow inner wall of the shell 17 through a rotating shaft, two ends of the connecting rod 21 are respectively rotatably hinged with the other end of the gear 22 and one end of the transmission plate 20, the connecting rod 21 inclines from the gear 22 to the rack 23, the other end of the transmission plate 20 is fixed with the bottom of the movable contact plate 18 in an insulating mode, two ends of the retaining spring 24 are respectively fixedly connected with the bottom end of the rack 23 and the other end of the gear 22, and a connecting line of two points of the retaining spring 24 is located below a connecting point of the connecting rod 21 and the gear 22 to a mounting point of the gear 22.
The working principle is as follows: when the contactor is installed and used, the transmission plate 20 is ensured to be always in a vertical geocentric state under the self gravity, the rack 23 is pressed downwards, the rack 23 drives the gear 22 to rotate, the gear 22 is upwards tilted to push the connecting rod 21 to drive the transmission plate 20 and the movable contact plate 18 to ascend together, at the moment, a connecting line of two points of the spring 24 is kept from the lower part of a connecting line between a connecting point of the connecting rod 21 and the rack 23 and a mounting point of the gear 22 to move to the upper part, a dead angle formed by collineation of the connecting line of the two points of the spring 24 and the connecting point of the connecting rod 21 and the rack 23 to the mounting point of the gear 22 is kept, at the moment, the gear 22 is tensioned by the spring 24 to be kept in a position state meshed with the rack 23, the movable contact 4 and the static contact 3 are always in stable contact, and the problem that the stable state is maintained by depending on electricity and the contact state of the contactor is unstable is solved.
The linear expansion and contraction device further comprises a thrust mechanism, the thrust mechanism can be any current device for realizing linear expansion and contraction, such as a hydraulic expansion and contraction rod, a pneumatic expansion and contraction rod, an electric expansion and contraction rod, an elastic expansion and contraction body and the like, the thrust mechanism comprises a coil 6, a coil rack 7, an iron core 8 and a coil base 9, the coil 6 is wound on the outer periphery of the coil rack 7 arranged inside the coil base 9, the slidable iron core 8 is arranged on the inner side of the coil rack, the iron core 8 is made of electromagnetic pure iron, such as DT4E, and the coil rack 7 is made of plastic; the rack 23 penetrating through the seat plate 2 penetrates through the coil seat 9 and then is fixedly connected with the iron core 8;
an iron yoke 16, the iron yoke 16 being located on top of the coil former 7; the coil holder 9 and the iron yoke 16 are fixed to the lower end of the bottom surface of the seat plate 2 by screws.
The coil fixing device further comprises coil binding posts 11, and positive and negative poles of the coil 6 are respectively connected with the two coil binding posts 11 fixed on the seat plate 2; the wire of the coil 6 is convenient to be fixedly connected.
The working principle is as follows: the coil 6 is electrified to generate a magnetic field, the magnetic field passes through the coil rack 7 and acts on the iron core 8, magnetic lines of force of the magnetic field pass through the iron core 8 and the coil 6 to form a closed state and are strengthened under the action of the iron yoke 16, the direction of the current determines the direction of the magnetic lines of force according to the 'right-hand spiral rule', and the iron core 8 made of electromagnetic pure iron material moves towards the direction of the magnetic lines of force under the action of magnetic force, such as moving towards the direction of M or N in fig. 1;
when the current of the coil 6 is from top to bottom, the magnetic force of the magnetic field generated by the coil 6 makes the iron core 8 drive the rack 23 to move downwards (in the N direction); the coil 6 is reversely connected with a power supply, and the iron core 8 drives the rack 23 to move upwards (in the direction M) by the magnetic force of the magnetic field generated by the coil 6, so that the rack 23 can move upwards and downwards.
The device also comprises a plastic block 19, and the transmission plate 20 is fixedly connected with the plastic block 19 fixed in the middle of the bottom of the movable contact plate 18; after the transmission plate 20 is lifted, the impact force of the contact between the two movable contacts 4 and the two static contacts 3 on the movable contact plate 18 is uniformly borne, the movable contact plate 18 is prevented from being deformed due to uneven stress, and the contact stability between the contacts is ensured.
The device also comprises a bracket 5, wherein the bracket 5 is provided with a through hole, and a transmission plate 20 penetrates through the bracket 5 fixed on the shell 17; the bracket 5 further ensures that the driving plate 20 does not displace when the connecting rod 21 rotates at the hinge point, and further ensures the stable contact between the movable contact 4 and the stationary contact 3.
The number of the transmission plates 20, the connecting rods 21, the support 5, the gear 22, the retaining spring 24 and the movable contact plate 18 is two, the number of the fixed contacts 3 and the number of the movable contacts 4 are two, the fixed contacts and the movable contacts are symmetrically arranged by the central line of the rack 23, control over two groups of circuits is achieved, and practicability is improved.
The power supply device also comprises a plurality of power supply contact posts 13, and the conductive power supply contact posts 13 penetrate through and are fixed on the seat plate 2 and then are fixedly connected with the static contact 3; the wire is connected with the stationary contact 3 through the power contact column 13 in a quick manner.
The fixed part also comprises a cap cover 1, and the bottom of the hollow cap cover 1 is fixedly connected with the top of the shell 17 to form a closed space at the top of the shell 17 for protecting the power supply contact column 13.
The wire harness fixing structure is characterized by further comprising a wire sleeve 15, wherein the wire sleeve 15 made of a deformable material is fixedly clamped in a through hole in the top of the cap cover 1, the deformable material can be deformable rubber, and the wire harness 14 is firstly concentrated through the wire sleeve 15 and then enters the cap cover 1; the centralized wire harness is convenient to manage, and the condition that the wire harness is scattered is avoided.
The fixing plate 10 is fixed at the bottom of the shell 17 in a spot welding mode; the whole is conveniently fixed by the fixing plate 10.
The invention relates to an operation method of a self-locking contactor, which comprises the following steps:
installation: the fixed plate 10 is fixed on the electric equipment, so that the driving plate 20 is always in a vertical ground center state under the gravity of the driving plate;
switching on: in a normally open state, when the movable contact 4 needs to be in stable contact with the fixed contact 3, electricity is controlled to enter the coil 6 through the coil wiring terminal 11, the current electrified by the coil 6 is from top to bottom, the magnetic field magnetic force generated by the coil 6 enables the iron core 8 to drive the rack 23 to move downwards (in the N direction), the rack 23 pushes the gear 22 to eccentrically rotate, the gear 22 rotates to drive the connecting rod 21 to enable the transmission plate 20 and the movable contact plate 18 to lift up (in the P direction), at the moment, the spring 24 is kept to move from the lower part to the upper part by bypassing dead corners under the pushing of the rack 23, the movable contact 4 is in stable contact with the fixed contact 3, and the leads of the power wiring terminals 13 on the two fixed contacts 3 are stably connected with large current, even if the coil 6 is electrically disconnected, the stable contact closed state is still kept under the action of reverse resistance of the spring 24, the gear 22 and the rack 23;
disconnecting: when the contactor needs to be closed, the contactor is reversely connected to enter the current direction of the coil 6, magnetic force of a magnetic field generated by the coil 6 enables the iron core 8 to drive the rack 23 to move upwards (in the direction M), the rack 23 drives the gear 22 to eccentrically rotate, the gear 22 drives the connecting rod 21 to further drive the transmission plate 20 to move downwards (in the direction Q), the movable contact plate 18 drives the movable contact 4 to be separated from the static contact 3, the contactor enters a normally open state, and even if the coil 6 is electrically disconnected, a stable contact separation interval state is still kept under the action of reverse resistance of the spring 24, the gear 22 and the rack 23.
Claims (9)
1. A latching contactor, comprising: the fixed part is provided with two spaced static contacts (3) in an insulating and fixed mode;
the device comprises a movable contact plate (18) and movable contacts (4), wherein two movable contacts (4) corresponding to the static contacts (3) are fixed at two ends of the movable contact plate (18);
the mechanical self-locking part is arranged on the fixed part in a lifting manner, the movable contact plate (18) is fixed on the mechanical self-locking part, and the mechanical self-locking part drives the movable contact plate (18) to be in a self-locking state after rising or falling;
the fixing part comprises a seat plate (2) and a shell (17), and the seat plate (2) is fixed in the shell (17); the mechanical self-locking part comprises a transmission plate (20), a connecting rod (21), a gear (22) and a rack (23), one end of a rack (23) can penetrate through the seat plate (2) in a sliding mode, the other end of the rack (23) is meshed with a gear (22), one end, close to the rack (23), of the gear (22) is rotatably and eccentrically fixed on the shell (17), two ends of a connecting rod (21) are respectively rotatably hinged with the other end of the gear (22) and one end of a transmission plate (20), the connecting rod (21) inclines towards the rack (23) from the gear (22), the other end of the transmission plate (20) is fixed with the bottom of a movable contact plate (18) in an insulating mode, two ends of the retaining spring (24) are respectively fixedly connected with the bottom end of the rack (23) and the other end of the gear (22), and at the moment, a connecting line of two points of the retaining spring (24) is located below a connecting point of the connecting rod (21) and the gear (22) to a connecting point of the gear (22).
2. The self-latching contact of claim 1, wherein: the thrust mechanism comprises a coil (6), a coil rack (7), an iron core (8) and a coil base (9), wherein the coil (6) is wound on the outer periphery of the coil rack (7) arranged in the coil base (9), the slidable iron core (8) is arranged on the inner side of the coil rack, and the iron core is electromagnetic pure iron; a rack (23) penetrating through the seat plate (2) penetrates through the coil seat (9) and then is fixedly connected with the iron core (8); the iron yoke (16), the iron yoke (16) locates at the top of coil former (7); the coil seat (9) and the iron yoke (16) are fixed at the lower end of the bottom surface of the seat plate (2).
3. The self-latching contact of claim 1, wherein: the coil fixing device further comprises coil binding posts (11), and positive and negative poles of the coil (6) are respectively connected with the two coil binding posts (11) fixed on the seat plate (2); the device also comprises a plastic block (19), and the transmission plate (20) is fixedly connected with the plastic block (19) fixed in the middle of the bottom of the movable contact plate (18).
4. The self-latching contact of claim 1, wherein: the device also comprises a bracket (5), and a transmission plate (20) penetrates through the bracket (5) fixed on the shell (17).
5. The self-latching contact of claim 1, wherein: the transmission plate (20), the connecting rod (21), the gear (22), the retaining spring (24) and the movable contact plate (18) are two, and the number of the static contact points (3) and the number of the movable contact points (4) are two, and the two static contact points and the two movable contact points are symmetrically arranged on the center line of the rack (23).
6. The self-latching contact of claim 1, wherein: the power supply device is characterized by further comprising a plurality of power supply contact columns (13), wherein the power supply contact columns (13) are fixedly connected with the static contact (3) after being fixedly penetrated through the seat plate (2).
7. The self-latching contact of claim 1, wherein: the fixed part also comprises a cap cover (1), the bottom of the hollow cap cover (1) is fixedly connected with the top of the shell (17), and the power supply contact column (13) is positioned in a closed space between the cap cover (1) and the top of the shell (17).
8. The self-latching contact of claim 1, wherein: the wire harness fixing device is characterized by further comprising a wire sleeve (15), wherein the wire sleeve (15) is fixedly clamped in a through hole in the top of the cap cover (1), and the wire harness (14) is concentrated through the wire sleeve (15) and then enters the cap cover (1); the device also comprises a fixing plate (10), and the fixing plate (10) is fixed at the bottom of the shell (17).
9. A method of operating a latching contactor, using the latching contactor of any one of claims 1 to 8, comprising the steps of:
installation: the fixed plate (10) is fixed on the electric equipment, and the transmission plate (20) is always in a vertical ground center state under the gravity of the transmission plate;
switching on: the control electricity enters the coil (6) through the coil wiring terminal (11) to generate a magnetic field, the current electrified by the coil (6) is from top to bottom, the magnetic force of the magnetic field generated by the coil (6) downwards enables the iron core (8) to drive the rack (23) to move downwards, the rack (23) pushes the gear (22) to eccentrically rotate, the gear (22) rotates to drive the connecting rod (21) to enable the transmission plate (20) and the movable contact plate (18) to lift up and move, at the moment, the spring (24) is kept to move to the top from the bottom by bypassing a dead angle under the pushing of the rack (23), and the movable contact (4) is stably contacted and closed with the static contact (3);
disconnecting: the magnetic field magnetic force generated by the coil (6) upwards enables the iron core (8) to drive the rack (23) to move upwards, the rack (23) drives the gear (22) to rotate eccentrically, the gear (22) drives the connecting rod (21) to further drive the transmission plate (20) to move downwards, and the movable contact plate (18) drives the movable contact (4) to be separated from the static contact (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010454879.2A CN111710561B (en) | 2020-05-26 | 2020-05-26 | Self-locking contactor and operation method |
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| CN202010454879.2A CN111710561B (en) | 2020-05-26 | 2020-05-26 | Self-locking contactor and operation method |
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| CN111710561B true CN111710561B (en) | 2022-06-07 |
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| CN112867295B (en) * | 2020-12-24 | 2022-05-13 | 四川三诚瑞和智能科技有限公司 | Wireless intelligent control panel with prevent mistake and touch clean structure |
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| CN105762023A (en) * | 2016-04-28 | 2016-07-13 | 厦门大学嘉庚学院 | Mechanical self-locking contactor and working method thereof |
| CN106024528A (en) * | 2016-07-31 | 2016-10-12 | 刘凡 | Electric self-locking type contactor |
| CN209561311U (en) * | 2019-05-13 | 2019-10-29 | 上海伊闻电子科技有限公司 | Two tunnel on-off relay of self-sustaining |
| CN110853983A (en) * | 2019-11-27 | 2020-02-28 | 东台市高科技术创业园有限公司 | Magnetic latching relay for power electronic equipment |
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