CN109935503A - A kind of movable contact system and frame circuit breaker of frame circuit breaker - Google Patents
A kind of movable contact system and frame circuit breaker of frame circuit breaker Download PDFInfo
- Publication number
- CN109935503A CN109935503A CN201910250190.5A CN201910250190A CN109935503A CN 109935503 A CN109935503 A CN 109935503A CN 201910250190 A CN201910250190 A CN 201910250190A CN 109935503 A CN109935503 A CN 109935503A
- Authority
- CN
- China
- Prior art keywords
- contact
- moving
- tension spring
- connecting elements
- circuit breaker
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000007769 metal material Substances 0.000 claims description 4
- 230000003068 static effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 206010037660 Pyrexia Diseases 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Abstract
The invention discloses a kind of movable contact system of frame circuit breaker and frame circuit breakers, movable contact system includes contact support, moving-contact unit, tension spring, the first fulcrum, moving-contact unit is rotationally connected with contact by the first fulcrum and supports that the head of moving-contact unit sets movable contact；Tension spring one end is connected to contact support；Attaching has connecting elements on the moving-contact unit, and the tension spring other end is connected to the connecting elements.Present invention connecting elements described in attaching on moving-contact unit efficiently solves tension spring and moving-contact unit is directly connected to the problems such as existing tension spring installs bore deformation for replacing moving-contact unit to connect with tension spring.
Description
Technical field
The present invention relates to field of circuit breakers, movable contact system and frame open circuit more particularly to a kind of frame circuit breaker
Device.
Background technique
The movable contact system of traditional frame circuit breaker includes contact support, moving-contact unit, pressure spring, fulcrum, moving contact
Unit is rotationally connected with contact by fulcrum and supports, pressure spring is connected to contact and supports between the head of moving-contact unit.Pressure spring
Enough pressure is generated, dynamic/static contact is enable to contact, and the contact resistance between dynamic/static contact meets the requirements, is reduced in normal work
As when the calorific value that generates.Also, when there are, (such as short circuit), generate repulsion (Huo Mu between dynamic/static contact when fault current for circuit
Power), pressure spring has enough pressure, prevents moving contact from being denounceed and convinces the improper separation of cause by patient analysis and make purpose of breaker failure.In addition, breaker
In separating brake, the spring force of pressure spring can push contact to support to rotate along separating brake direction, make dynamic/static contact quick separating, reduction is put out
The arc time guarantees that breaker being capable of effective disjunction circuit.However, being had the following problems using pressure spring: moving-contact unit is around fulcrum
Rotation is a movement in a curve track, causes pressure spring that cannot move along a straight line during the motion (bending), this reduces pressures
Effective pressure of the spring to moving contact；For pressure spring close to dynamic/static contact contact zone, the resistance of the position is maximum (fever most serious), when depositing
In fault current, selective protection function (being resistant in short-term) is especially carried out, contact system will be born centainly under fault current
Time remains up, at this point, the temperature of moving contact is very high, causes pressure spring to be easy to happen plastic deformation at high temperature, makes contact
Pressure is reduced；Pressure spring frame mode is using long lever ratio, although can make pressure spring sheet under conditions of meeting contact pressure
The spring force of body is reduced, but under the structure of long lever ratio, after contact is worn in life span or failure disjunction, can be led
Cause contact pressure decaying too fast, and contact pressure reduction further results in contact burning during the opening process, entire conducting system
Fever deteriorates.
Application No. is 201310719466.2 Chinese invention patents to disclose a kind of movable contact system of breaker, adopts
Above-mentioned pressure spring is replaced with tension spring to connect contact support and moving-contact unit, efficiently solves the movable contact system of conventional circuit breaker
Using the above problem present in pressure spring.But since the link position of tension spring and moving-contact unit is in the tail portion of moving-contact unit,
Specifically, moving-contact unit tail portion setting tension spring mounting hole, and the tension spring mounting hole close to moving-contact unit tail portion with it is soft
The welding section of connecting component, high temperature is annealed when moving-contact unit is welded with the component that is flexible coupling, so that this region material is strong
Degree decline, under tension spring tension effect, tension spring mounting hole deforms in life span, and tension spring tension is caused to be decayed.In addition,
Tension spring material is stainless steel wire, and moving-contact unit is TU1 fine copper, and the two hardness differs greatly, during divide-shut brake, tension spring peace
Fill hole serious wear.
Summary of the invention
The present invention provides a kind of movable contact system of frame circuit breaker and frame circuit breakers, and which overcome the prior arts
Shortcoming present in the movable contact system of frame circuit breaker.
The technical solution adopted by the present invention to solve the technical problems is: a kind of movable contact system of frame circuit breaker, packet
Contact support, moving-contact unit, tension spring, the first fulcrum are included, moving-contact unit is rotationally connected with contact by the first fulcrum and supports,
The head of moving-contact unit sets movable contact；Tension spring one end is connected to contact support；Attaching has connection structure on the moving-contact unit
Part, the tension spring other end are connected to the connecting elements.
Further, the spacing of the tie point of the tension spring other end and connecting elements and first fulcrum is greater than described
The spacing of moving-contact unit tail portion and the first fulcrum.
Further, the arm of force for the pulling force that the tension spring other end is subject to is greater than the contact pressure that the movable contact is subject to
The arm of force.
Further, the connecting elements, which is worn, connects on first fulcrum, and relatively fixed with the moving-contact unit.
Further, the connecting elements is metal material, and the hardness of connecting elements is greater than the moving-contact unit
Hardness.
Further, the quantity of the connecting elements is multiple, and the moving-contact unit includes multiple and column distribution dynamic
Contact blade, adjacent moving contact piece are separated by connecting elements；The quantity of the tension spring be it is multiple, it is a pair of with multiple connecting elements one
It answers.
Further, each connecting elements respectively includes two strip connection sheets being oppositely arranged, the side of two connection sheet
Equipped with interconnecting piece, two connection sheets are linked together；One end of two connection sheet is respectively equipped with what confession first fulcrum passed through
Through-hole, the other end of two connection sheet connect the other end of corresponding tension spring；The moving contact piece and connecting elements correspond,
And each moving contact piece is located between two connection sheets of corresponding connecting elements；The interconnecting piece and the tension spring are located at connection
The opposite two sides of piece, and interconnecting piece is resisted against corresponding moving contact on piece.
Further, the contact is supported to be equipped with the second fulcrum, and second fulcrum is parallel with first fulcrum, described
One end of tension spring is mounted on second fulcrum.
Further, the connecting elements is equipped with hanging hole, and the other end of the tension spring is mounted on the hanging hole.
The present invention separately provides a kind of frame circuit breaker, including movable contact system, and the movable contact system is using above-mentioned hair
A kind of movable contact system of bright frame circuit breaker.
Compared to the prior art, the invention has the following advantages:
1, present invention connecting elements described in attaching on moving-contact unit, for replacing moving-contact unit to connect with tension spring,
Solve the problems, such as that tension spring and moving-contact unit are directly connected to existing tension spring installation bore deformation.Also that is, connecting elements
Proposition, facilitate the connecting portion of tension spring to avoid moving-contact unit and the welding region of component of being flexible coupling, also facilitate the choice of members
The component that hardness is greater than moving-contact unit is attached with tension spring.
2, since the spacing of the tie point of the tension spring other end and connecting elements and first fulcrum is greater than described move
The spacing of contact unit tail portion and the first fulcrum, so that the arm of force for the pulling force that the tension spring other end of the invention is subject to compares the prior art
The arm of force of pulling force that is subject to of the tension spring other end (the tension spring other end of the prior art is directly articulated in moving-contact unit tail portion) more
Long (increasing to 46.7mm from original 21.5mm), so that under identical contact pressure, needed for tension spring of the invention
Power sharp fall, effectively increases the fatigue life of tension spring other end drag hook, at the same decrease on connecting elements with tension spring
The abrasion and deformation at the position of other end connection.
3, the arm of force for the pulling force that the tension spring other end is subject to is greater than the arm of force for the contact pressure that the movable contact is subject to, really
The pulling force of the Paula spring other end is smaller, to further increase the fatigue life of tension spring.
4, due to the quantity of the connecting elements be it is multiple, the moving-contact unit includes multiple and column distribution moving contact
Piece, adjacent moving contact piece is separated by connecting elements so that connecting elements, which can replace, is located at adjacent move in original moving-contact unit
Thermosetting plastics piece between contact blade makes the introducing of connecting elements not will increase the quantity of components of existing product, and
Connecting elements preferably uses metal material, and thermal conductivity is good, can improve the heat condition of moving-contact unit.
Invention is further described in detail with reference to the accompanying drawings and embodiments；But a kind of frame circuit breaker of the invention
Movable contact system and frame circuit breaker be not limited to the embodiment.
Detailed description of the invention
Fig. 1 is the decomposition diagram of movable contact system of the invention；
Fig. 2 is the structural schematic diagram of connecting elements of the invention；
Fig. 3 is the cooperation schematic diagram of connecting elements of the invention, moving-contact unit, tension spring；
Fig. 4 is the D structure schematic diagram of movable contact system of the invention
Fig. 5 is the main view of movable contact system of the invention；
Fig. 6 is the cross-sectional view of movable contact system of the invention；
Fig. 7 is the stress diagram of movable contact system of the invention；
Fig. 8 be movable contact system of the invention in circuit there are stress diagrams when fault current.
Specific embodiment
Embodiment, referring to Figure 1 shown in-Fig. 8, a kind of movable contact system of frame circuit breaker of the invention, including contact
Support 1, moving-contact unit, tension spring 4, the first fulcrum 3, moving-contact unit is rotationally connected with contact by the first fulcrum 3 and supports 1,
The head of moving-contact unit sets movable contact；4 one end of tension spring is connected to contact and supports 1；Attaching has connection on the moving-contact unit
Component 5,4 other end of tension spring are connected to the connecting elements 5.The quantity of the connecting elements 5 is multiple, the moving contact list
Member includes multiple and column distribution moving contact pieces 2, the axis being respectively equipped between its head and tail portion on each moving contact piece 2
Hole wears with first fulcrum 3 and connects cooperation.Two adjacent moving contact pieces 2 are separated by connecting elements 5；The quantity of the tension spring 4 is
It is multiple, it is corresponded with multiple connecting elements 5, specifically, multiple tension springs 4 form a line.
In the present embodiment, the spacing of the tie point and first fulcrum 3 of 4 other end of tension spring and connecting elements 5 is big
Spacing in the moving-contact unit tail portion and the first fulcrum 3.Also, the arm of force for the pulling force that 4 other end of tension spring is subject to is big
In the arm of force for the contact pressure that the movable contact is subject to.
In the present embodiment, each connecting elements 5 is elongated, and 5 one end of each connecting elements wears connect at described first respectively
On axis 3, and it is relatively fixed with the moving-contact unit；Each 5 other end of connecting elements is respectively equipped with hanging hole 512, the tension spring 4
The other end is the hanging hole 512 for being mounted on corresponding connecting elements.As shown in Fig. 2, the connecting elements is specifically included and is oppositely arranged
Two connection sheets 51, two connection sheet 51 be strip, and the position of the side approximate mid-section of two connection sheet 51 be equipped with connection
Portion 52 links together two connection sheets 51, and has preset interval between two connection sheets 51.Distinguish one end of two connection sheets 51
Equipped with the through-hole 511 passed through for first fulcrum 3, the other end of two connection sheets 51 connects the other end of corresponding tension spring (tool
The other end of body, two connection sheets 51 is mutually drawn close, and is respectively equipped with the hanging hole 51, and the hanging hole 51 of two connection sheets, 51 other end
Coaxially).The moving contact piece 2 is corresponded with connecting elements 5, and each moving contact piece is located at the two of corresponding connecting elements
Between connection sheet 51；The interconnecting piece 52 and the tension spring 4 two sides that be located at connection sheet 51 opposite, and interconnecting piece 52 is resisted against phase
The moving contact on piece answered.The other end of two connection sheets 51 is mutually drawn close, and coaxial hanging hole 512 is arranged, and can make two connection sheets
Keep preset interval to accommodate moving contact piece between 51, meanwhile, the same tension spring is mounted convenient for two connection sheets, 51 other end.Institute
It states connecting elements to design using the above structure, the intensity of connecting elements on the one hand can be improved, on the other hand can make to connect structure
The assembly and disassembly of part and moving contact piece are very easy, and will not destroy the integrality of moving contact piece original structure.
In the present embodiment, the connecting elements 5 is metal material, and the hardness of connecting elements 5 is greater than the moving contact list
The hardness of member.Specifically, the connecting elements 5 is identical as 4 material of tension spring, is all made of stainless steel material.In this way, connecting elements
5 is suitable with 4 hardness of tension spring, can effectively inhibit wear phenomenon during divide-shut brake, improves structural life-time.
In the present embodiment, the contact supports 1 to be equipped with the second fulcrum 6, and second fulcrum 6 and first fulcrum 3 are flat
Row, one end of the tension spring 4 is mounted on second fulcrum 6.Second fulcrum 6 is axially distributed multi-turn card slot 61 along it, utilizes
One end of 61 Locating extension spring 4 of card slot makes the state of each 4 keeping parallelism of tension spring distribution, so that it is guaranteed that the stress one of each tension spring 4
It causes.
The stress condition of movable contact system of the invention is as shown in Figure 5, wherein F- tension spring tension, F1- contact pressure, O-
Moving contact piece axle center, O1- tension spring one end installation site, O2- tension spring other end installation site, L0- endpoint O is at a distance from O1, L1-
The contact pressure arm of force, the L2- tension spring arm of force, two installation site distance of L3- tension spring, the angle of θ-L3 and L0.Tension spring tension F and contact
Pressure F1 obtains following formula according to principle of moment balance:
F1*L1=F*L2=F*L0*Sinθ
From the above equation, we can see that
Meeting contact pressure F1, under the premise of arm of force L1, so that tension spring tension is as small as possible, this requires L0*Sin θ
It is worth as big as possible.Therefore, one end installation site O1 of tension spring is made to be located at contact support in the space of current movable contact system
The position of protection walls 11 (contact supports 1 to be equipped with protection walls 11 at the position of approximate mid-section backwards to the side of contact unit) root
Place, can make the pulling force F of tension spring as small as possible.
A kind of movable contact system of frame circuit breaker of the invention, is arranged the connecting elements 5, and by 4 other end of tension spring
It is connected to 5 other end of connecting elements, the tension spring and moving-contact unit for efficiently solving the prior art are directly connected to existing drawing
Spring installs the problem of bore deformation.Also, the arm of force for the pulling force that 4 other end of tension spring of the invention is subject to is than the tension spring 4 of the prior art
The arm of force for the pulling force that the other end (the tension spring other end of the prior art is directly articulated in moving-contact unit tail portion) is subject to is longer (from original
Come 21.5mm increase to 46.7mm), thus, under identical contact pressure, power needed for tension spring 4 of the invention significantly under
Drop, effectively increases the fatigue life of 4 other end drag hook of tension spring, while decreasing the hanging hole 51 on 5 other end of connecting elements
Abrasion and deformation.Therefore, the present invention can meet the job requirement of movable contact system using single tension spring 4.5 generation of connecting elements
It is isolated for original thermosetting plastics piece between moving contact piece 2, thermal conductivity is good, improves the fever feelings of moving-contact unit
Condition.
In "on" position, when there are when fault current, act on the component 7 that is flexible coupling (be flexible coupling component 7 and the dynamic touching for circuit
Head piece 2 tail portion is welded and fixed) on the direction long-range navigation magnetic force F2 towards a left side, as shown in fig. 6, the component 7 that is flexible coupling is in long-range navigation magneticaction
Under deform and acted on connecting elements 5 to the left so that long-range navigation magnetic force F2 pushes connecting elements 5 to generate up time around the first fulcrum 3
Needle force square increases an additional contact pressure F 3 to static contact 8, prevents dynamic/static contact 8 from denounceing under fault current and open, forms electricity
Power compensation, to improve short resistance to ability of the contact under fault current.
A kind of frame circuit breaker of the invention, including movable contact system, the movable contact system use aforementioned present invention institute
A kind of movable contact system for the frame circuit breaker stated.
Above-described embodiment is only used to further illustrate that a kind of movable contact system of frame circuit breaker of the invention and frame are disconnected
Road device, but the invention is not limited to embodiments, it is to the above embodiments any according to the technical essence of the invention
Simple modification, equivalent change and modification is fallen within the scope of protection of technical solution of the present invention.
Claims (10)
1. a kind of movable contact system of frame circuit breaker, including contact support, moving-contact unit, tension spring, the first fulcrum, moving contact
Unit is rotationally connected with contact by the first fulcrum and supports that the head of moving-contact unit sets movable contact；Tension spring one end is connected to touching
Head is supported；It is characterized by: attaching has connecting elements on the moving-contact unit, the tension spring other end is connected to the connection structure
Part.
2. the movable contact system of frame circuit breaker according to claim 1, it is characterised in that: the tension spring other end and company
The spacing of the tie point of connection member and first fulcrum is greater than the spacing of the moving-contact unit tail portion and the first fulcrum.
3. the movable contact system of frame circuit breaker according to claim 1, it is characterised in that: the tension spring other end by
The arm of force of pulling force be greater than the arm of force of contact pressure that the movable contact is subject to.
4. the movable contact system of frame circuit breaker according to claim 1, it is characterised in that: the connecting elements, which is worn, to be connect
On first fulcrum, and it is relatively fixed with the moving-contact unit.
5. the movable contact system of frame circuit breaker according to claim 1, it is characterised in that: the connecting elements is metal
Material, the hardness of the connecting elements are greater than the hardness of the moving-contact unit.
6. the movable contact system of frame circuit breaker according to claim 1 or 4 or 5, it is characterised in that: the connecting elements
Quantity be it is multiple, the moving-contact unit includes multiple and column distribution moving contact piece, and adjacent moving contact piece is by connection structure
Part separates；The quantity of the tension spring be it is multiple, with multiple connecting elements correspond.
7. the movable contact system of frame circuit breaker according to claim 6, it is characterised in that: each connecting elements respectively includes
The side of two strip connection sheets being oppositely arranged, two connection sheet is equipped with interconnecting piece, and two connection sheets are linked together；This two
One end of connection sheet is respectively equipped with the through-hole passed through for first fulcrum, and the other end of two connection sheet connects corresponding tension spring
The other end；The moving contact piece and connecting elements correspond, and each moving contact piece is located at corresponding connecting elements
Between two connection sheets；The interconnecting piece and the tension spring two sides that be located at connection sheet opposite, and interconnecting piece be resisted against it is corresponding dynamic
On contact blade.
8. the movable contact system of frame circuit breaker according to claim 1, it is characterised in that: the contact support is equipped with
Second fulcrum, second fulcrum is parallel with first fulcrum, and one end of the tension spring is mounted on second fulcrum.
9. the movable contact system of frame circuit breaker according to claim 1, it is characterised in that: the connecting elements is equipped with
Hanging hole, the other end of the tension spring are mounted on the hanging hole.
10. a kind of frame circuit breaker, including movable contact system, it is characterised in that: the movable contact system uses such as claim
The movable contact system of frame circuit breaker described in any one of 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910250190.5A CN109935503A (en) | 2019-03-29 | 2019-03-29 | A kind of movable contact system and frame circuit breaker of frame circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910250190.5A CN109935503A (en) | 2019-03-29 | 2019-03-29 | A kind of movable contact system and frame circuit breaker of frame circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109935503A true CN109935503A (en) | 2019-06-25 |
Family
ID=66988721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910250190.5A Pending CN109935503A (en) | 2019-03-29 | 2019-03-29 | A kind of movable contact system and frame circuit breaker of frame circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109935503A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207587676U (en) * | 2017-12-27 | 2018-07-06 | 常熟开关制造有限公司(原常熟开关厂） | A kind of moving contact of breaker |
| CN209561328U (en) * | 2019-03-29 | 2019-10-29 | 厦门宏发开关设备有限公司 | A kind of movable contact system and frame circuit breaker of frame circuit breaker |
-
2019
- 2019-03-29 CN CN201910250190.5A patent/CN109935503A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207587676U (en) * | 2017-12-27 | 2018-07-06 | 常熟开关制造有限公司(原常熟开关厂） | A kind of moving contact of breaker |
| CN209561328U (en) * | 2019-03-29 | 2019-10-29 | 厦门宏发开关设备有限公司 | A kind of movable contact system and frame circuit breaker of frame circuit breaker |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201134363Y (en) | Stationary contact component of isolation switch | |
| CN209561328U (en) | A kind of movable contact system and frame circuit breaker of frame circuit breaker | |
| CN109935503A (en) | A kind of movable contact system and frame circuit breaker of frame circuit breaker | |
| CN201325564Y (en) | Following pantograph head of electric locomotive high-speed pantograph | |
| CN2572539Y (en) | Outdoor high voltage isolating switch | |
| CN101236865A (en) | Contactor system for low-voltage breaker | |
| US4402284A (en) | Internal combustion engine rocker arm arrangement having a readily replaceable plate spring | |
| US2394204A (en) | Electrode holder | |
| CN203380309U (en) | Conjugate cam reciprocating-pull clip seat rocker mechanism | |
| CN206976267U (en) | A kind of Thermomagnetic type current protection system for breaker of plastic casing | |
| CN201352674Y (en) | Unidirectional set electron | |
| CN210536169U (en) | Wire clamping device | |
| CN112271107A (en) | Large current relay using novel pushing structure | |
| CN208608134U (en) | Low fever high life armature structure of electromagnetic relay | |
| CN207818368U (en) | A kind of coil winding machine element fixing device for current transformer production | |
| US2376996A (en) | Electrical cutout | |
| CN219739310U (en) | Contact finger type copper-aluminum bar clamping device | |
| CN201302942Y (en) | Conductive loop contact finger structure of disconnecting switch | |
| CN213212046U (en) | Large-current relay using structure with spring propulsion | |
| CN210378792U (en) | Novel magnetic induction foot switch | |
| JP5054159B2 (en) | brake | |
| CN219221095U (en) | Double-sided braking mechanical disc brake | |
| CN201376141Y (en) | Abrasion resistant type submerged-arc welding contact tube | |
| CN213212045U (en) | Large current relay using novel pushing structure | |
| CN205028860U (en) | Magnetic latching relay moving contact pushing mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |