CN207781502U - A kind of direct-push single-point magnetic latching relay - Google Patents
A kind of direct-push single-point magnetic latching relay Download PDFInfo
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- CN207781502U CN207781502U CN201820025512.7U CN201820025512U CN207781502U CN 207781502 U CN207781502 U CN 207781502U CN 201820025512 U CN201820025512 U CN 201820025512U CN 207781502 U CN207781502 U CN 207781502U
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Abstract
The utility model discloses a kind of direct-push single-point magnetic latching relays, including：Pedestal, terminal assemblies are mounted on the pedestal, are installed with stationary contact thereon, direct-push magnetic keeps driving device, on the pedestal, iron core assembly, including iron core and contact are supported, the contact support is connect with the iron core, under the action of the direct-push magnetic keeps driving device, the iron core keeps the coil rack of driving device to slide straightly along the direct-push magnetic, and the contact supports to be tower structure；Moving contact, it is installed with movable contact thereon, the terminal assemblies are electrically connected with the moving contact, and the moving contact is installed in the contact support, and the direction upper limit for being supported to slide in the iron core by the contact, the movable contact stretch out the contact support and are oppositely arranged with the stationary contact outside.The engagement of dynamic and static contact is more stablized, and the requirement to installation accuracy, the stability higher of structure are reduced.
Description
Technical field
The utility model is related to technical field of circuit control, a kind of especially direct-push single-point magnetic latching relay.
Background technology
Magnetic latching relay is a kind of new type of relay developed in recent years and a kind of automatic switch and other
Electromagnetic relay is the same, has automatic switching on and cutting action to circuit.The difference is that magnetic latching relay is to remove excitation
A kind of bistable relay of state when still maintaining excitation later.
Sound contact generally uses bridge-type disclosed in CN203536306U patents in existing magnetic latching relay
The shortcomings that double-fracture contact structure, this bridge architecture, is to need to ensure that component holding in both sides is horizontal, to ensure bridge both ends
Contact reliable electrical connection can be achieved, this requires installation accuracy very high, and disturbance also ten occurs in use
This contact structure of partial volume destructible.
Invention content
The purpose of this utility model is to provide a kind of direct-push single-point magnetic latching relay, and the engagement of dynamic and static contact is more
Stablize, reduces the requirement to installation accuracy, the stability higher of structure.
The technical scheme that the utility model is provided is as follows：A kind of direct-push single-point magnetic latching relay, including：
Pedestal,
Terminal assemblies are mounted on the pedestal, are installed with stationary contact thereon,
Direct-push magnetic keeps driving device, is mounted on the pedestal,
Iron core assembly, including iron core and contact support that the contact support is connect with the iron core, in the direct-push
Under the action of magnetic keeps driving device, the iron core keeps the coil rack of driving device to slide straightly along the direct-push magnetic,
And the contact supports to be tower structure；
Moving contact is installed with movable contact thereon, and the terminal assemblies are electrically connected with the moving contact, the moving contact installing
In contact support, and the direction upper limit for being supported to slide in the iron core by the contact, the movable contact stretch out outside
The contact support is oppositely arranged with the stationary contact.
The technical program, moving contact are conductive devices, are provided with movable contact, and moving contact is in iron core assembly sliding side
Support limit namely contact support that movable contact can be driven to complete linear reciprocation action by the contact of iron core assembly upwards.Movable contact
Overhanging opposite with stationary contact from contact frame, direct-push magnetic keeps driving device to make iron core assembly output linear reciprocation fortune
It is dynamic, the closure and separate operation of movable contact and stationary contact can be driven.The action form of direct-push determines system mechanical efficiency
Height, loss are few；And the movable contact stationary contact of single-point type can be driven to coordinate, the stability of system on-off action significantly improves,
Also there is certain tolerance rate for installation, is conducive to improve product yield.
Specifically, the direct-push magnetic latching relay includes a moving contact, it is installed on the terminal assemblies
One stationary contact, and the stationary contact is arranged towards the iron core；
Preferably, further comprise reaction spring, the reaction spring be located at the moving contact and the iron core assembly it
Between.
The technical program is arranged reaction spring between moving contact and the iron core assembly, is connect in movable contact and stationary contact
After touch, iron core assembly can continue to compress reaction spring, the rebound effect of reaction spring on movable contact so that movable contact with
The closed state of stationary contact is more firm, avoids that security risk occurs.
Preferably, the moving contact includes mounting portion, guide part and over-hang part；
Wherein, the mounting portion is connect by the guide part with the over-hang part, is provided on the mounting portion described
The installation position of stationary contact, the guide part can be supported to enclose inside it along the contact sets the track to be formed sliding；It is described overhanging
Portion is connect with the guide part, and is extended to and supported a side end face of the upper movable contact to be backwards oppositely arranged with the contact；
The reaction spring is between the mounting portion and the iron core assembly.
Contact supports to be tower structure, and moving contact can be supported to slide, then movable contact is arranged in moving contact along contact
On, the structure of mono-contact type may be implemented.Contact support is enclosed inside it sets the sliding rail to form moving contact so that moving contact
Stroke more stablize, to ensure the matching of movable contact and stationary contact closed position.
The moving contact includes at least two over-hang parts, and the guide part is identical as the over-hang part quantity, described
Over-hang part is located at contact and supports opposite both sides, and two over-hang parts are connected by conducting wire.
Preferably, the iron core assembly further includes connecting rod, and the contact supports to be plastic part, one end quilt of the montant
Plastic packaging enters the contact and interior fastening, the other end of the connecting rod is supported to be anchored in the mounting hole on the iron core.
The technical program, contact support are connect with iron core by connecting rod, wherein connecting rod and iron core by cold-heading rivet clasp,
The connection that the contact of connecting rod and plastic material is supported then is realized during preparing the plastic packaging of contact support, simple for process, section
Cost-saving.
It is further preferred that the connecting rod is " T " shape, one " cross " is fixture block, and one is " perpendicular " for montant；The contact branch
Hold the connecting end surface including closing on the iron core side；The fixture block is entered by plastic packaging in the connecting end surface.
The technical program enhances the bonding strength that connecting rod is supported with contact, the company of ensure that by a fixture block structure
Reliability when extension bar is supported to move synchronously with contact.
Preferably, the connecting rod is placed in cold-heading in the mounting hole and fastens.Be arranged on the iron core outer ring surface it is fluted,
The groove is adapted with the position of the mounting hole.
The technical program, groove structure ensure that cold-heading action does not interfere with the fit dimension of iron core outer ring surface, Ke Yibao
Iron core assembly is in the accuracy for carrying out sliding movement after the completion of prepared by card.
Preferably, it includes the coil rack, electromagnetic coil, yoke, magnet steel and magnetic that direct-push magnetic, which keeps driving device,
Steel bracket；
Around being located on the coil rack, the yoke is disposed around the coil rack surrounding formation and encloses the electromagnetic coil
Frame；The magnet steel holder is removably installed in the yoke.The magnet steel holder includes buckling parts and receiving portion；Wherein,
The buckling parts is fastened on the side of the yoke and fixes, and described accommodation section is connect with the buckling parts, and described accommodation section
Inside positioned at the yoke side, described accommodation section piece together the receiving for placing the magnet steel with side adjacent thereto
Chamber.
The technical program, yoke be disposed around coil rack surrounding enclose frame like structure, can be prepared with global formation, technique
Property is good.Magnet steel is detachably connected on by magnet steel holder in the peripheral frame, easy to disassemble, convenient for needing the when of adjusting magnetic force to adjust magnetic
Steel.
Specifically, the terminal assemblies include input terminal and outlet terminal, the stationary contact is arranged in the leading-out terminal
On son, the input terminal is connect with the over-hang part of the moving contact by conducting wire.
A kind of direct-push single-point magnetic latching relay provided by the utility model, can bring following at least one
Advantageous effect：
1, the action form of direct-push determines that system mechanical efficiency is high, and loss is few；And the dynamic of single-point type can be driven
Contact stationary contact cooperation, the stability of system on-off action significantly improve, and also have certain tolerance rate for installation, are conducive to improve
Product yield.
2, the rebound effect of reaction spring so that the closed state of movable contact and stationary contact is more firm on movable contact,
It avoids that security risk occurs.
3, contact support is connect with iron core by connecting rod, wherein connecting rod and iron core by cold-heading rivet clasp, connecting rod and
The connection that the contact of plastic material is supported then is realized during preparing the plastic packaging of contact support, simple for process, saves cost.Card
Block structure can enhance the bonding strength that connecting rod is supported with contact.Groove structure ensure that cold-heading action does not interfere with outside iron core
The fit dimension of anchor ring, it is ensured that iron core assembly is in the accuracy for carrying out sliding movement after the completion of preparation
4, yoke be disposed around coil rack surrounding enclose frame like structure, can be prepared with global formation, good manufacturability.Magnet steel
It is detachably connected in the peripheral frame by magnet steel holder, it is easy to disassemble, convenient for needing the when of adjusting magnetic force to adjust magnet steel.
Description of the drawings
Below by a manner of clearly understandable, preferred embodiment is described with reference to the drawings, to direct-push single-point magnetic keep after
Above-mentioned characteristic, technical characteristic, advantage and its realization method of electric appliance are further described.
Fig. 1 is the floor map of direct-push single-point reversing switch formula magnetic latching relay internal structure.
Fig. 2 is the sectional view of direct-push single-point reversing switch formula magnetic latching relay internal structure.
Fig. 3 is the sectional view of reversing switch formula reversing switch formula magnetic latching relay internal structure.
Fig. 4 is outlet terminal in Fig. 3, contact is supported and the three-dimensional cooperation figure of moving contact.
Fig. 5 is the dimensional structure diagram of moving contact.
Fig. 6-a are the dimensional structure diagrams of the iron core assembly of Fig. 1 and Fig. 2 repeat circuits.
Fig. 6-b are the dimensional structure diagrams of the iron core assembly of Fig. 3 repeat circuits.
Fig. 7-a are the sectional views of the inside composition of the iron core assembly of Fig. 1 and Fig. 2 repeat circuits.
Fig. 7-b are the inside composition sectional views of the iron core assembly of Fig. 3 repeat circuits.
Fig. 8 be yoke, magnet steel holder and magnet steel three-dimensional assembly diagram.
Fig. 9 is the dimensional structure diagram of magnet steel holder.
Drawing reference numeral explanation：100, pedestal, the 200, first outlet terminal, the 201, second outlet terminal, 210, input terminal,
220, stationary contact, 300, moving contact, 310, guide part, 320, over-hang part, 330, mounting portion, 330, movable contact, 400, iron core it is total
At, 410, contact support, 420, connecting rod, 421, fixture block, 430, iron core, 431, mounting hole, 432, groove, 500, yoke,
510, magnet steel holder, 511, buckling parts, 512, receiving portion, 513, dismounting hole, 520, magnet steel, 530, coil rack, 531, coil,
600, reaction spring.
Specific implementation mode
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, attached drawing will be compareed below
Illustrate specific embodiment of the present utility model.It should be evident that the accompanying drawings in the following description is only the one of the utility model
A little embodiments for those of ordinary skill in the art without creative efforts, can also be according to these
Attached drawing obtains other attached drawings, and obtains other embodiments.
To make simplified form, in each figure only schematically show with the relevant part of the utility model, they are simultaneously
Its practical structures as product is not represented.
Embodiment one
As depicted in figs. 1 and 2, the present embodiment discloses a kind of reversing switch formula magnetic latching relay, including：Pedestal 100, end
Sub-component, direct-push magnetic keep driving device, iron core assembly 400, moving contact 300 and contact to support 410.
Pedestal 100 is a shell structure, can accommodate the internal components of relay portion in the inner, above be stamped a lid by pedestal
100 lids close.Terminal assemblies are mounted on pedestal 100, are installed with stationary contact 220 thereon, terminal assemblies are electrically connected with inlet wire and outlet
It connects.Iron core assembly 400 includes iron core 430 and contact supports 410, and contact supports that 410 connect with iron core 430, in direct-push magnetic
Under the action of keeping driving device, iron core 430 keeps the coil rack 530 of driving device to slide straightly along direct-push magnetic, directly pushes away
It is the common structure of the prior art that formula magnetic, which keeps driving device, and the mechanism of action forms magnetic field, magnetic field force by variable-current
Driving iron core 430 does straight reciprocating motion.
It is tower structure that contact, which supports 410, and straight reciprocating motion is done with it under the drive of iron core 430.Moving contact
Movable contact 330 is installed on 300, movable contact 330 is oppositely arranged with stationary contact 220, and terminal assemblies are electrically connected with moving contact 300.
Moving contact 300 is installed in contact and supports in 410, and the 410 direction upper limits slid in iron core are supported by contact.Namely contact is supported
410 can drive moving contact 300 to move, while moving contact 300 supports that 410 can both keep opposing stationary with contact, can also
Support there is certain stroke namely floating type limit on 410 in contact.Moving contact 300 can be by both cases
Contact supports 410 drives to slide straightly, and realizes the on-off action with stationary contact 220.
It is further preferred that when moving contact 300 supports 410 floating type limit by contact, it can be in moving contact 300 and iron core
Reaction spring 600 is added between assembly 400.With reference to shown in Fig. 2, when iron core assembly 400 moves up to stationary contact 220 and moves
When 330 exactly in contact with of contact, yoke 500 of the iron core 430 apart from top also has a certain distance, and iron core assembly 400 may be used also at this time
To continue up, moving contact can not continue to move up.And due to contact support 410 can opposite 300 displacement of moving contact, then iron core
Assembly 400 will not immediately be limited by moving contact 300 and will continue to move up compression reaction spring 600, until iron core 430 is attracted to magnetic
On yoke 500.Reaction spring 600 is in confined state at this time, and bounce can act on stationary contact 220 and movable contact 330
So that it is closed fastening on interface, increases reliability of structure.Meanwhile contact of the movable contact with stationary contact after long-term use
Face also will appear the problem of surface abrasion, and reaction spring 600 can also play the role of compensation, in the stroke for ensureing iron core 430
Movable contact 330 can be closed with stationary contact 220.
Illustratively, with reference to shown in Fig. 2, Fig. 5.Moving contact 300 includes guide part 310, over-hang part 320 and mounting portion
330, guide part 310 can support 410 to enclose inside it along contact and set the track to be formed sliding, to ensure movable contact 330 and stationary contact
Point 220 to just coordinating；Over-hang part 320 is connect with guide part 310, and is extended to and supported on 410 backwards to described dynamic tactile with contact
One side end face of point is oppositely arranged.Reaction spring 600 is between mounting portion 330 and iron core assembly 400.Further, it moves and touches
First 300 include two over-hang parts 320 and two guide parts 310, is located at the both sides of mounting portion 330, i.e. a guide part
310 and an over-hang part 320 be located at the side of mounting portion.Two over-hang parts 320 can further be connected by conducting wire.It of courses,
The quantity of over-hang part and guide part can be more, for example quantity is 4,8.
It should be noted that terminal assemblies include input terminal 210 and the first outlet terminal 200, stationary contact 220 in Fig. 1
It is arranged on outlet terminal 200, input terminal 210 is connect with the over-hang part 320 of moving contact 300 by conducting wire, iron core assembly
Moving back and forth realizes the on-off action of one group of stationary contact and movable contact.
Similar therewith, as shown in Fig. 3, Fig. 4 and Fig. 6-b, reversing switch formula magnetic latching relay includes two and sets relatively
The stationary contact 220 set is respectively installed on the first outlet terminal 200 and the second outlet terminal 201, correspondingly, contact supports 410
On also backwards to setting there are two movable contact 330, and the outer contact that stretches out supports that 410 are oppositely arranged with stationary contact 220 respectively, iron core
The on-off action of two groups of dynamic and static contacts may be implemented in the reciprocating motion of assembly, this structure can play the role of reversing switch.Its
The structure of moving contact 300 can be according to above-mentioned design, and what need to only be adapted to supports contact 410 changes are that can house two reversely
Moving contact 300, with reference to shown in Fig. 3 and Fig. 4, over-hang part 320, which is extended to, to be supported on 410 to contact backwards to the corresponding movable contact
One side end face is arranged corresponding thereto, and reaction spring 600 is located between two moving contacts 300.
Embodiment two
On the basis of embodiment one, with reference to shown in Fig. 6-a and Fig. 7-a, to be protected suitable for magnetic shown in Fig. 1 and Fig. 2
The iron core assembly structure of relay is held, iron core assembly 400 further includes connecting rod 420, and it is plastic part, connecting rod that contact, which supports 410,
420 one end enters contact by plastic packaging and supports that fastening, the other end of connecting rod are located in the mounting hole 431 on iron core 430 tightly in 410
Gu illustratively, connecting rod 420 is placed in cold-heading in mounting hole 431 and fastens, the connection of other rivet clasps can also be used in addition to this
Mode.Namely the moulding process of the iron core assembly 400 is：First the mounting hole of iron core 430 is placed in by one section of connecting rod 420
It in 431, is then fixed by cold-heading, plastic packaging molded contact supports 410 after the completion, and connecting rod 420 is coated on plastic part contact
410 inside are supported to complete fastening.
Illustratively, referring to Figure 5, connecting rod 420 is " T " shape, and one " cross " is fixture block 421, and one is " perpendicular " for montant；
It includes the connecting end surface for closing on 430 side of iron core that contact, which supports 410,；Fixture block 421 is entered by plastic packaging in connecting end surface.Cross a fixture block
421 structures enhance the bonding strength that connecting rod 420 supports 410 with contact, ensure that connecting rod 420 supports that 410 is same with contact
Reliability when step movement.It of courses, the fixture block structure of more than one can be further included in connecting rod 420.
Preferably, it is arranged fluted 432 on 430 outer ring surface of iron core, groove 432 is adapted with the position of connecting rod 420.If
The reason of setting groove structure is that cold-heading or other riveting process all can apply mechanicals efforts to iron core outer ring surface, this can not
The meeting avoided causes the variation of iron core outer ring surface shape, and the variation of this shape in order to prevent influences the cooperation ruler of iron core outer ring surface
It is very little, the accuracy of its sliding movement is then influenced, groove 432 can opened up on the outer ring surface of 431 opposite positions of installation.Figure
Reversing switch formula magnetic latching relay of the iron core assembly structure suitable for Fig. 3 in 6-b and Fig. 7-b.
Embodiment three
On the basis of embodiment one or two, as shown in Figure 1, Figure 2, shown in Fig. 3 and Fig. 8, direct-push magnetic keeps driving device
Including coil rack 530, electromagnetic coil 531, yoke 500, magnet steel 520 and magnet steel holder 510.
On coil rack 530, yoke 500 is disposed around 530 surrounding of coil rack and forms peripheral frame 531 winding of electromagnetic coil；
Magnet steel holder 510 is removably installed in yoke 500, and includes the accommodating chamber for placing magnet steel 520 thereon.Yoke
500 be disposed around 530 surrounding of coil rack enclose frame like structure, can be prepared with global formation, good manufacturability.Magnet steel 520 passes through
Magnet steel holder 510 is detachably connected in the peripheral frame, easy to disassemble, convenient for adjusting magnet steel 520 when needing to adjust magnetic force.Magnet steel
The dismounting hole 513 for dismounting is additionally provided on holder 520.
Illustratively, as shown in Figure 8 and Figure 9, magnet steel holder 510 includes buckling parts 511 and receiving portion 512；Wherein, it fastens
Portion 511 is fastened on the side of yoke 500 and fixes, and receiving portion 512 is connect with buckling parts 511, and receiving portion 512 is located at yoke
The inside of 510 sides, receiving portion 512 piece together accommodating chamber with side adjacent thereto.
It should be noted that above-described embodiment can be freely combined as needed.The above is only the utility model
Preferred embodiment, it is noted that for those skilled in the art, do not departing from the utility model principle
Under the premise of, several improvements and modifications can also be made, these improvements and modifications also should be regarded as the scope of protection of the utility model.
Claims (10)
1. a kind of direct-push single-point magnetic latching relay, which is characterized in that including：
Pedestal,
Terminal assemblies are mounted on the pedestal, are installed with stationary contact thereon,
Direct-push magnetic keeps driving device, is mounted on the pedestal,
Iron core assembly, including iron core and contact support that the contact support is connect with the iron core, is protected in the direct-push magnetic
Under the action of holding driving device, the iron core keeps the coil rack of driving device to slide straightly along the direct-push magnetic, and institute
It states contact and supports to be tower structure；
Moving contact is installed with movable contact thereon, and the terminal assemblies are electrically connected with the moving contact, and the moving contact is installed in institute
It states in contact support, and the direction upper limit for being supported to slide in the iron core by the contact, outside the movable contact described in stretching
Contact support is oppositely arranged with the stationary contact.
2. direct-push single-point magnetic latching relay according to claim 1, it is characterised in that：
The direct-push magnetic latching relay includes a moving contact, and there are one the stationary contacts for installing on the terminal assemblies
Point, and the stationary contact is arranged towards the iron core.
3. direct-push single-point magnetic latching relay according to claim 2, it is characterised in that：Further comprise counter-force bullet
Spring, the reaction spring is between the moving contact and the iron core assembly.
4. direct-push single-point magnetic latching relay according to claim 3, it is characterised in that：The moving contact includes installation
Portion, guide part and over-hang part, wherein
The mounting portion is connect by the guide part with the over-hang part, and the peace of the stationary contact is provided on the mounting portion
Position is filled, the guide part can be supported to enclose inside it along the contact sets the track to be formed sliding；The over-hang part is led with described
It is connected to portion, and extends to and support a side end face of the upper movable contact to be backwards oppositely arranged with the contact；The counter-force bullet
Spring is between the mounting portion and the iron core assembly.
5. direct-push single-point magnetic latching relay according to claim 4, it is characterised in that：The moving contact includes at least
Two over-hang parts, the guide part is identical as the over-hang part quantity, and the over-hang part is located at contact and supports relatively
Both sides, and two over-hang parts are connected by conducting wire.
6. according to any direct-push single-point magnetic latching relays of claim 1-5, it is characterised in that：The iron core assembly
Further include connecting rod, the contact supports to be plastic part, and one end of the connecting rod is supported by plastic packaging material envelope in the contact
The other end of interior fastening, the connecting rod is anchored in the mounting hole on the iron core.
7. direct-push single-point magnetic latching relay according to claim 6, it is characterised in that：The connecting rod is " T " word
Shape, one " cross " are fixture block, and one is " perpendicular " for montant；The contact supports to include the connecting end surface for closing on the iron core side；It is described
Fixture block is entered by plastic packaging in the connecting end surface.
8. direct-push single-point magnetic latching relay according to claim 6, it is characterised in that：The connecting rod is placed in described
Cold-heading fastens in mounting hole；And it is arranged fluted on the iron core outer ring surface, the position of the groove and the mounting hole is mutually fitted
Match.
9. direct-push single-point magnetic latching relay according to claim 6, it is characterised in that：The direct-push magnetic keeps driving
Dynamic device includes the coil rack, electromagnetic coil, yoke, magnet steel and magnet steel holder；
Around being located on the coil rack, the yoke is disposed around the coil rack side and forms peripheral frame the electromagnetic coil；
The magnet steel holder is removably installed in the yoke；The magnet steel holder includes buckling parts and receiving portion；Wherein, described
Buckling parts is fastened on the side of the yoke and fixes, and described accommodation section is connect with the buckling parts, and described accommodation section is located at
The inside of the yoke side, described accommodation section piece together the receiving for placing the magnet steel with yoke side adjacent thereto
Chamber.
10. according to any direct-push single-point magnetic latching relays of claim 1-5, it is characterised in that：The terminal group
Part includes input terminal and outlet terminal, and the stationary contact is arranged on the outlet terminal, and the input terminal is moved with described
The over-hang part of contact is connected by conducting wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820025512.7U CN207781502U (en) | 2018-01-08 | 2018-01-08 | A kind of direct-push single-point magnetic latching relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820025512.7U CN207781502U (en) | 2018-01-08 | 2018-01-08 | A kind of direct-push single-point magnetic latching relay |
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| Publication Number | Publication Date |
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| CN207781502U true CN207781502U (en) | 2018-08-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108010804A (en) * | 2018-01-08 | 2018-05-08 | 行驱电气（上海）有限公司 | A kind of direct-push single-point magnetic latching relay |
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- 2018-01-08 CN CN201820025512.7U patent/CN207781502U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108010804A (en) * | 2018-01-08 | 2018-05-08 | 行驱电气（上海）有限公司 | A kind of direct-push single-point magnetic latching relay |
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