CN107507739B - Sealed contact assembly - Google Patents
Sealed contact assembly Download PDFInfo
- Publication number
- CN107507739B CN107507739B CN201710852200.3A CN201710852200A CN107507739B CN 107507739 B CN107507739 B CN 107507739B CN 201710852200 A CN201710852200 A CN 201710852200A CN 107507739 B CN107507739 B CN 107507739B
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- piece
- insulating shell
- contact
- armature
- contact assembly
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 58
- 230000003068 static effect Effects 0.000 claims abstract description 31
- 229910052742 iron Inorganic materials 0.000 claims abstract description 29
- 235000014676 Phragmites communis Nutrition 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 230000004308 accommodation Effects 0.000 claims 2
- 230000002035 prolonged effect Effects 0.000 abstract description 6
- 238000003825 pressing Methods 0.000 description 11
- 239000007789 gas Substances 0.000 description 9
- 230000005389 magnetism Effects 0.000 description 3
- 238000005056 compaction Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- 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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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
- Contacts (AREA)
Abstract
The invention relates to the technical field of relay accessories, and particularly discloses a sealed contact assembly which comprises an armature cover, a yoke plate, a valve, an insulating shell and two static contacts, wherein the armature cover is provided with a first end and a second end; the armature cover is welded on the yoke iron plate, one end of the valve is welded on the yoke iron plate, the other end of the valve is embedded and formed on the insulating shell, the two static contacts are embedded and formed on the insulating shell, the yoke iron plate is provided with a through hole which is communicated with the containing blind hole and the containing cavity, and the containing blind hole, the through hole and the containing cavity form a closed containing space; during actual use, the contact assembly and other accessories of the relay form the complete relay, during actual use, the connection or disconnection of the two static contacts occurs in the closed accommodating space, electric arcs generated when the two static contacts are connected or disconnected are prevented from damaging other accessories, the service life of the relay is prolonged, meanwhile, the interference caused by the connection or disconnection of the two static contacts by other accessories is also prevented, and the stability of the service performance of the contact assembly is ensured.
Description
Technical Field
The invention relates to the technical field of relay accessories, and particularly discloses a sealed contact assembly.
Background
Relays, as "automatic switches" in circuits, have been one of the essential basic elements in many electronic devices; the relay comprises a plurality of accessories and a contact unit for realizing the connection or disconnection of a circuit, when the relay is used, electric arcs are inevitably generated when the contact unit is connected or disconnected, due to the unreasonable structural design of the relay in the prior art, the electric arcs generated by the contact unit can damage other accessories of the relay, the service life of the relay is greatly reduced, meanwhile, the other accessories can also interfere the connection or disconnection of the contact unit, and the service performance of the contact unit is extremely unstable.
Disclosure of Invention
In order to overcome the disadvantages and shortcomings of the prior art, the present invention provides a sealed contact assembly, in which the connection or disconnection of two stationary contacts occurs in a sealed receiving space, thereby ensuring the stability of the service performance of the contact assembly and prolonging the service life of a relay.
In order to achieve the purpose, the invention discloses a sealed contact assembly, which comprises an armature cover, a yoke plate, a valve, an insulating shell and two stationary contacts, wherein the armature cover is provided with an accommodating blind hole; the armature cover is welded on the yoke iron plate, one end of the valve is welded on the yoke iron plate, the other end of the valve is embedded and formed in the insulating shell, the two static contacts are embedded and formed in the insulating shell, the yoke iron plate is provided with a through hole which is communicated with the containing blind hole and the containing cavity, and the containing blind hole, the through hole and the containing cavity form a closed containing space.
Preferably, the contact assembly further includes two auxiliary contacts, the two auxiliary contacts are embedded and formed in the insulating housing, one ends of the two auxiliary contacts protrude into the accommodating space, and the other ends of the two auxiliary contacts protrude out of the insulating housing.
Preferably, the contact assembly further comprises an air inflation tube embedded and formed in the insulating shell, the air inflation tube is provided with an air hole communicated with the accommodating space, and the air hole penetrates through the air inflation tube and the insulating shell.
Preferably, the contact assembly further comprises a slide rod unit, the slide rod unit comprises an armature piece, a reset spring, a rod piece and a moving point block, the armature piece is located in the accommodating space, the rod piece slides and is arranged in the through hole, the armature piece is connected with the rod piece, the armature piece slides and is arranged in the accommodating blind hole, two ends of the reset spring respectively abut against the armature piece and the yoke plate, the moving point block is connected with the rod piece, the moving point block and the armature piece are respectively located on two sides of the yoke plate, and the moving point block is used for conducting on or breaking off two static contacts.
Preferably, the sliding rod unit further includes a pre-pressing spring located in the accommodating space, the reset spring and the pre-pressing spring are both sleeved outside the rod member, the reset spring and the pre-pressing spring are respectively located on two sides of the yoke plate, one end of the pre-pressing spring abuts against the contact block, and the other end of the pre-pressing spring abuts against the yoke plate or the rod member.
Preferably, the slide rod unit further includes a push piece and a spring piece located in the accommodating space, the push piece is connected with the rod member, the push piece and the armature member are respectively located at two sides of the yoke plate, and the spring piece is embedded and molded in the push piece.
Preferably, the push sheet comprises a body part connected with the rod part and a guide plate part bent and extended from the body part, the guide plate part is slidably accommodated in the accommodating cavity, the spring leaf is provided with two contact pieces, and the moving point block and the contact pieces are respectively positioned on two sides of the guide plate part.
Preferably, the spring plate is provided with two elastic arms, and the two contact plates are respectively connected with the two elastic arms.
Preferably, the stationary contact is provided with a non-circular portion, the non-circular portion being located within the insulating housing.
Preferably, the valved housing is provided with a plurality of spaced apart tabs, each of the plurality of tabs being located within the insulating housing.
The invention has the beneficial effects that: during actual use, the contact assembly and other accessories of the relay form the complete relay, during actual use, the connection or disconnection of the two static contacts occurs in the closed accommodating space, electric arcs generated when the two static contacts are connected or disconnected are prevented from damaging other accessories, the service life of the relay is prolonged, meanwhile, the interference caused by the connection or disconnection of the two static contacts by other accessories is also prevented, and the stability of the service performance of the contact assembly is ensured.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic perspective view of another embodiment of the present invention;
FIG. 3 is an exploded view of the present invention;
FIG. 4 is an exploded view of another aspect of the present invention;
FIG. 5 is a schematic perspective view of a slide bar unit according to the present invention;
fig. 6 is a partially enlarged schematic view of a portion a in fig. 3.
The reference numerals include:
1-armature cover 2-yoke plate 3-valveable
4-insulating shell 5-stationary contact 6-accommodating blind hole
7-accommodating cavity 8-perforation 9-auxiliary contact
11-neck 12-gas tube 13-gas hole
14-ring groove 15-slide rod unit 16-armature piece
17-return spring 18-rod piece 19-moving point block
21-sleeve 22-positioning convex ring 23-push sheet
24-spring 25-body 26-guide plate
27-contact piece 28-spring arm 29-non-circular part
31-lug 32-first plane 33-second plane
34-pre-pressing spring.
Detailed Description
For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
Referring to fig. 1 to 4, a sealed contact assembly according to the present invention includes an armature cover 1, a yoke plate 2, a valve 3, an insulating case 4, and two stationary contacts 5, wherein the armature cover 1 is made of a metal material, the armature cover 1 is substantially hollow and cylindrical, the armature cover 1 is provided with a receiving blind hole 6, the receiving blind hole 6 is recessed from an outer surface of the armature cover 1, and the receiving blind hole 6 does not penetrate through the armature cover 1; the yoke iron plate 2 is substantially flat, in the embodiment, the yoke iron plate 2 is circular, the yoke iron plate 2 is used for covering the containing blind hole 6, the armature cover 1 and the valve 3 are respectively located at two sides of the yoke iron plate 2, that is, the yoke iron plate 2 is clamped between the armature cover 1 and the valve 3, the insulating shell 4 is connected on the yoke iron plate 2 through the valve 3, the insulating shell 4 and the yoke iron plate 2 are arranged at intervals, the insulating shell 4 is provided with a containing cavity 7, the containing cavity 7 is formed by recessing one side of the insulating shell 4 close to the yoke iron plate 2, the containing cavity 7 does not penetrate through the insulating shell 4, the valve 3 is substantially circular, the valve 3 is arranged around the containing cavity 7, the yoke iron plate 2 is used for covering the containing cavity 7, one end of each of the two stationary contacts 5 protrudes into the containing cavity 7, and the other end of each of the two stationary contacts 5 protrudes out of.
The armature cover 1 is welded on the yoke iron plate 2, one end of the valve 3 is welded on the yoke iron plate 2, preferably, the armature cover 1 and the valve 3 are both welded on the yoke iron plate 2 through laser, and the welding efficiency and the welding quality are improved; the other end of the valve 3 is embedded and formed (i.e., insert Molding or integral Molding) in the insulating shell 4, and the two stationary contacts 5 are embedded and formed in the insulating shell 4, compared with the case that the valve 3 and the stationary contacts 5 are assembled on the insulating shell 4, a gap is prevented from being generated between the valve 3 and the insulating shell 4 and between the stationary contacts 5 and the insulating shell 4, and meanwhile, the assembling efficiency between the valve 3, the stationary contacts 5 and the insulating shell 4 is also improved, the yoke plate 2 is provided with a through hole 8 for communicating the accommodating blind hole 6 with the accommodating cavity 7, the through hole 8 penetrates through the yoke iron plate 2, and the accommodating blind hole 6, the through hole 8 and the accommodating cavity 7 form a closed accommodating space, that is, the armature cover 1, the yoke iron plate 2, the valve 3, the insulating shell 4 and the stationary contacts 5 form a sealing body together.
When the relay is actually used, the contact assembly and other accessories of the relay form the complete relay, and when the relay is actually used, the two static contacts 5 are switched on or off in the closed accommodating space, so that electric arcs generated when the two static contacts 5 are switched on or switched off are prevented from damaging other accessories, and the service life of the relay is prolonged; meanwhile, the interference of other accessories on the connection or disconnection of the two static contacts 5 is also prevented, and the stability of the service performance of the contact assembly is ensured.
The contact assembly further comprises two auxiliary contacts 9, the two auxiliary contacts 9 are embedded and formed in the insulating shell 4, one ends of the two auxiliary contacts 9 extend into the accommodating space, the two auxiliary contacts 9 are connected or disconnected and are also located in the accommodating space, and the other ends of the two auxiliary contacts 9 extend out of the insulating shell 4. During practical use, the two stationary contacts 5 are used for connecting or disconnecting the main circuit, the two auxiliary contacts 9 are used for connecting or disconnecting the auxiliary circuit, and the two circuits can be simultaneously controlled to be connected or disconnected by utilizing one relay, so that the using number of the relays is reduced, and the using cost of the relays is reduced.
Referring to fig. 3, 4 and 6, the auxiliary contact 9 is provided with a card slot 11, the card slot 11 is formed by recessing from the outer surface of the auxiliary contact 9, and the card slot 11 is located in the insulating housing 4; after the auxiliary contact 9 is embedded and formed in the insulating shell 4, a part of the insulating shell 4 protrudes into the slot 11, and the auxiliary contact 9 is stably positioned on the insulating shell 4 by utilizing the mutual blocking between the side walls of the insulating shell 4 and the slot 11, so that the relative movement between the auxiliary contact 9 and the insulating shell 4 is avoided.
The contact assembly further comprises an air inflation tube 12, the air inflation tube 12 is approximately in a hollow cylindrical shape, the air inflation tube 12 is embedded and formed in the insulating shell 4, the air inflation tube 12 is provided with an air hole 13 communicated with the accommodating space, and the air hole 13 penetrates through the air inflation tube 12 and the insulating shell 4. During actual use, the external inflation equipment is communicated with the air hole 13 of the inflation tube 12 to pump out air in the closed accommodating space, and then inert gas (such as helium gas and the like) is filled into the accommodating space through the inflation tube 12, so that the static contact 5 and the auxiliary contact 9 are both positioned in the environment of the inert gas, and compared with the situation that the static contact 5 and the auxiliary contact 9 are positioned in the air, the rapid oxidation and denaturation caused by the generation of electric arcs in the use process of the static contact 5 and the auxiliary contact 9 are avoided, the service lives of the static contact 5 and the auxiliary contact 9 are prolonged, and further the service life of the relay is prolonged.
In this embodiment, the inflation tube 12 is provided with a ring groove 14, the ring groove 14 does not penetrate through the side wall of the inflation tube 12, and the ring groove 14 is formed by recessing from the outer surface of the inflation tube 12; after the gas tube 12 is embedded in the insulating shell 4, a portion of the insulating shell 4 protrudes into the annular groove 14, and the gas tube 12 is firmly fixed on the insulating shell 4 by the mutual stop between the side walls of the insulating shell 4 and the annular groove 14, so as to prevent the gas tube 12 and the insulating shell 4 from moving relatively.
Referring to fig. 1 to 6, the contact assembly further includes a sliding rod unit 15, the sliding rod unit 15 includes an armature member 16, a return spring 17, a rod member 18 and a moving point block 19, the rod member 18 is substantially long, the rod member 18 is slidably received in the through hole 8, the armature member 16 is connected to the rod member 18, the armature member 16 is slidably received in the receiving blind hole 6, two ends of the return spring 17 respectively abut against the armature member 16 and the yoke plate 2, the moving point block 19 is made of a conductive material, the moving point block 19 is connected to the rod member 18, in this embodiment, the armature member 16 and the moving point block 19 are respectively installed on two ends of the rod member 18, the moving point block 19 and the armature member 16 are respectively located on two sides of the yoke plate 2, and the moving point block 19 is used for connecting or disconnecting two stationary contacts 5.
After the relay is assembled, the relay is powered on, the yoke iron plate 2 is made to generate magnetism by the electromagnetic assembly of the relay, the yoke iron plate 2 after the magnetism is generated attracts the armature piece 16, the armature piece 16 moves towards the direction close to the yoke iron plate 2 along the accommodating blind hole 6, in the process, the reset spring 17 is compressed, the armature piece 16 moves along the through hole 8 along with the rod piece 18, the rod piece 18 moves along with the moving point block 19, the moving point block 19 is further abutted to one end of the two static contacts 5 protruding into the accommodating cavity 7, and the two static contacts 5 can be conducted through the moving point block 19. When the relay is powered off, the yoke plate 2 loses magnetism and no longer attracts the armature piece 16, the return spring 17 drives the armature piece 16 and the movable point block 19 to return under the action of the self elastic restoring force, and the two static contacts 5 are disconnected.
In this embodiment, the yoke plate 2 is provided with a sleeve 21, the sleeve 21 is accommodated in the through hole 8, the rod 18 penetrates through the sleeve 21, and the rod 18 is slidably connected in the sleeve 21; the sleeve 21 is provided with a positioning convex ring 22 which is abutted against the yoke iron plate 2, two ends of the return spring 17 are respectively abutted against the armature piece 16 and the sleeve 21, and compared with the return spring 17 which is directly abutted against the yoke iron plate 2, the abrasion of the return spring 17 to the yoke iron plate 2 is effectively avoided, and the service life of the yoke iron plate 2 is prolonged.
The sliding rod unit 15 further includes a pre-pressing spring 34 located in the accommodating space, the return spring 17 and the pre-pressing spring 34 are both sleeved on the outer side of the rod member 18, the return spring 17 and the pre-pressing spring 34 are respectively located on two sides of the yoke plate 2, one end of the pre-pressing spring 34 abuts against the moving point block 19, and the other end of the pre-pressing spring 34 abuts against the yoke plate 2 or the rod member 18.
In the use of relay, when moving some piece 19 and switching on two stationary contacts 5, pre-compaction spring 34 is in compression state, and pre-compaction spring 34 utilizes the elastic restoring force of self to make moving some piece 19 steadily contradict on two stationary contacts 5, prevents to receive unexpected touching or vibrations and lead to moving some piece 19 and stationary contact 5 separation because of the relay, promotes the stability that switches on between two stationary contacts 5, promotes the performance of relay. When the moving point block 19 is separated from the stationary contact 5, the pre-pressure spring 34 is in a natural length state.
The sliding rod unit 15 further includes a push piece 23 and a spring 24 located in the accommodating space, the push piece 23 is connected to the rod member 18, the push piece 23 and the armature member 16 are located on two sides of the yoke plate 2, respectively, in this embodiment, the push piece 23 is made of plastic, the push piece 23 can be installed on the rod member 18 according to actual needs, and of course, the rod member 18 can also be embedded and molded in the push piece 23; the spring plate 24 is embedded and molded on the push plate 23, and positioning and mounting efficiency of the spring plate 24 and the push plate 23 is improved compared with the case that the spring plate 24 is assembled on the push plate 23.
When the relay is electrified, the yoke plate 2 generates magnetic attraction to the armature piece 16, the armature piece 16 moves together with the rod piece 18, the rod piece 18 moves together with the push piece 23, and the reed 24 is arranged on the push piece 23, so that the push piece 23 moves together with the reed 24 when moving, the reed 24 is abutted against the two auxiliary contacts 9, and the two auxiliary contacts 9 can be conducted through the reed 24; when the relay is powered off, the reset spring 17 drives the armature piece 16 and the rod piece 18 to reset under the action of the elastic restoring force of the reset spring, and the push piece 23 and the reed 24 are driven to reset together when the rod piece 18 resets, so that the two auxiliary contacts 9 are disconnected.
The push sheet 23 comprises a body part 25 connected with the rod part 18 and a guide plate part 26 bent and extended from the body part 25, the body part 25 and the guide plate part 26 are both substantially flat, preferably, the guide plate part 26 is arranged perpendicular to the body part 25, the guide plate part 26 is slidably accommodated in the accommodating cavity 7, the spring piece 24 is provided with two contact pieces 27, and the moving point block 19 and the contact pieces 27 are respectively positioned at two sides of the guide plate part 26; in the use of relay, two contact 27 of reed 24 contradict respectively on two auxiliary contact 9, and two auxiliary contact 9 can switch on via reed 24, utilize conducting plate portion 26 to keep apart stationary contact 5 and auxiliary contact 9, ensure that the break-make between two stationary contacts 5, the break-make between two auxiliary contact 9 can not take place mutual interference, promote the performance of relay.
The spring plate 24 is provided with two elastic arms 28, the elastic arms 28 protrude out of the guide plate part 26, in this embodiment, the two guide plate parts 26 are located on the same side of the guide plate part 26, and two contact pieces 27 are respectively connected to the two elastic arms 28, preferably, the contact pieces 27 and the elastic arms 28 are integrally constructed. When the two contact pieces 27 respectively abut against the two auxiliary contacts 9, the elastic arm 28 elastically deforms, so that the spring piece 24 has a certain pre-pressure on the two auxiliary contacts 9, the separation of the spring piece 24 from the auxiliary contacts 9 due to accidental touch or vibration of the relay is prevented, the conduction stability between the two auxiliary contacts 9 is improved, and the use performance of the relay is improved.
Referring to fig. 1 to 4, the stationary contact 5 is provided with a non-circular portion 29, according to actual requirements, the cross-sectional shape of the non-circular portion 29 may be a semicircle, an ellipse, a triangle, a rectangle, etc., and the non-circular portion 29 is located in the insulating housing 4; when the contact assembly is manufactured, the insulating housing 4 is formed with a non-circular hole for accommodating the non-circular portion 29, and the non-circular portion 29 is engaged with the non-circular hole to prevent relative rotation between the stationary contact 5 and the insulating housing 4.
The valve 3 is provided with a plurality of tabs 31 spaced from each other, the plurality of tabs 31 being located within the insulating shell 4; when the contact assembly is manufactured, a part of the insulating housing 4 protrudes into between two adjacent protruding pieces 31, and the protruding pieces 31 and the insulating housing 4 are blocked from each other to prevent relative rotation between the valve 3 and the insulating housing 4, thereby ensuring that the valve 3 is stably positioned on the insulating housing 4.
One end, far away from the valve 3, of the insulating shell 4 is provided with a first plane 32 and a second plane 33 which are parallel to each other, the first plane 32 and the second plane 33 are located in different planes, the static contact 5 penetrates through the first plane 32, and the auxiliary contact 9 penetrates through the second plane 33; compared with the static contact 5 and the auxiliary contact 9 which penetrate through the same plane, in the production process of the contact assembly, the static contact 5 and the auxiliary contact 9 are effectively prevented from position errors, and the production yield of the contact assembly is improved.
In this embodiment, the gas-filled tube 12 also penetrates through the second plane 33, the two auxiliary contacts 9 are both located on the same side of the connecting line between the two stationary contacts 5, and the two stationary contacts 5 are both located between the gas-filled tube 12 and the auxiliary contacts 9; after the contact assembly is manufactured, the gas-filled tube 12 and the auxiliary contacts 9 are respectively positioned on two sides of a connecting line between the two static contacts 5, so that the weight of the insulating shell 4 on two sides of the connecting line between the two static contacts 5 is ensured to be approximately equal, and the injection molding yield of the insulating shell 4 is improved.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710852200.3A CN107507739B (en) | 2017-09-19 | 2017-09-19 | Sealed contact assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710852200.3A CN107507739B (en) | 2017-09-19 | 2017-09-19 | Sealed contact assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107507739A CN107507739A (en) | 2017-12-22 |
| CN107507739B true CN107507739B (en) | 2021-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710852200.3A Active CN107507739B (en) | 2017-09-19 | 2017-09-19 | Sealed contact assembly |
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| CN (1) | CN107507739B (en) |
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| CN108987191A (en) * | 2018-08-08 | 2018-12-11 | 三友联众集团股份有限公司 | A kind of contactor Improvement type contact assembly |
| KR102537549B1 (en) * | 2018-08-31 | 2023-05-26 | 엘에스일렉트릭(주) | Direct Current Relay |
| CN109637890B (en) * | 2019-01-16 | 2024-02-20 | 三友联众集团股份有限公司 | Air current arc blowing type relay |
| CN110504136B (en) * | 2019-07-23 | 2025-01-07 | 厦门宏发电力电器有限公司 | A sealed high voltage DC relay |
| CN112786378A (en) * | 2021-02-07 | 2021-05-11 | 三友联众集团股份有限公司 | Auxiliary switch terminal conveniently-connected electromagnetic relay |
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| Publication number | Publication date |
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| CN107507739A (en) | 2017-12-22 |
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