WO2015106672A1 - 一种增加接触器绝缘性能的防护罩及外壳结构 - Google Patents

一种增加接触器绝缘性能的防护罩及外壳结构 Download PDF

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Publication number
WO2015106672A1
WO2015106672A1 PCT/CN2015/070569 CN2015070569W WO2015106672A1 WO 2015106672 A1 WO2015106672 A1 WO 2015106672A1 CN 2015070569 W CN2015070569 W CN 2015070569W WO 2015106672 A1 WO2015106672 A1 WO 2015106672A1
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WO
WIPO (PCT)
Prior art keywords
wall
contactor
conductor
protective cover
casing
Prior art date
Application number
PCT/CN2015/070569
Other languages
English (en)
French (fr)
Chinese (zh)
Inventor
蔡洪洲
张红伟
靳海富
Original Assignee
德力西电气有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 德力西电气有限公司 filed Critical 德力西电气有限公司
Priority to BR112016015291-3A priority Critical patent/BR112016015291B1/pt
Priority to RU2016125544A priority patent/RU2665470C2/ru
Publication of WO2015106672A1 publication Critical patent/WO2015106672A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/14—Terminal arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H01H50/04—Mounting complete relay or separate parts of relay on a base or inside a case
    • H01H50/041—Details concerning assembly of relays
    • H01H50/042—Different parts are assembled by insertion without extra mounting facilities like screws, in an isolated mounting part, e.g. stack mounting on a coil-support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/0264—Protective covers for terminals

Definitions

  • the invention relates to a contactor, in particular to a protective cover for increasing the insulation performance of a contactor and a contactor outer casing structure having the same, belonging to the technical field of low-voltage electrical appliances.
  • a contactor is a non-manually operated mechanical switching device that can carry and frequently turn on and off a normal circuit current.
  • a contactor which is widely used at present includes an outer casing structure composed of a casing 1 and a protective cover 2, and a tile-shaped connecting screw 3 and a contact plate disposed in the outer casing structure. 4 and a plurality of phase charged conductors composed of wires 5 and the like, which are widely used at present, are contactors having four-phase charged conductors.
  • the housing 1 is provided with a plurality of insulating barrier walls 11 evenly spaced apart, and a phase of the charging conductor is disposed between each adjacent two insulating barrier walls 11 , and the charged conductor is insulated from two adjacent ones. A certain gap 6 is left between the barrier walls 11.
  • the protective cover 2 is of a unitary structure and is mounted above the charged conductor. On the outer side of the charging conductor, the protective cover 2 is formed with a number of wiring protection walls 21 of the same number as the charged conductor. In order to prevent the user from getting an electric shock during operation, the use is safe.
  • Figure 3 shows a partial cross-sectional view of the prior art contactor, from which it can be seen that the tile 31 on the tile-shaped terminal screw 3 of the live conductor is spaced from the shield 2
  • the wire protection wall 21 and the edge of the casing 1 are closest, so the shortest leakage distance of the prior art contactor is from the tile 31 as shown by the straight path b in FIG.
  • the wire protection wall 21 approaching the tile 31 is crawled to a vertical distance of the upper edge of the casing 1, and in order to enhance the insulation performance of the contactor, the tile 31 must be enlarged
  • the vertical straight line distance of the upper edge of the housing 1 is undoubtedly a considerable obstacle to the development of miniaturization of the contactor product.
  • the technical problem to be solved by the present invention is that in order to enhance the insulation performance, the contactor in the prior art must increase the size of the casing, which is disadvantageous to the problem of miniaturization design, and provides a shell without increasing the contactor. Based on the body size, the insulation of the contactor is enhanced, which is beneficial to the miniaturized design of the contactor product.
  • an outer casing structure for miniaturization, personalization of a contactor and meeting the shortest leakage distance of the contactor is provided.
  • a protective cover for increasing the insulation performance of the contactor is mounted on the housing of the contactor for preventing an operator from accidentally contacting a plurality of phase-band electrical conductors mounted on the housing, and the plurality of phases of the charged conductors are in a row
  • the protective cover includes a wiring shielding wall located outward of the charged conductor of each phase, the protective cover further comprising a wall surrounding the wiring shielding wall and forming a first surrounding with the wiring shielding wall a plurality of interphase insulating walls of the structure, a plurality of the interphase insulating walls are evenly spaced and the charging conductor is disposed between the adjacent interphase insulating walls; the interphase insulating wall is inserted into the charging conductor and the housing a gap between the insulating barrier walls to form a line from the outermost edge of the live conductor, crawling straight along the surface of the phase-insulated wall, and then folding upwardly to the shell closest to the charged conductor on the casing The shortest leakage path at the innermost edge of the body
  • the wire protection extending wall length extends in parallel with the rows of the plurality of phased charged conductors, the phase-to-phase insulating wall is perpendicularly connected to the wire shielding wall and extends toward the inner side of the charging conductor to enable the A length of the interphase insulating wall extending along an inner side of the charging conductor at least partially coincides with a projection of the charging conductor in a direction in which the plurality of phases of the charging conductor are arranged.
  • the wire for protecting the wiring is connected to the position of the interphase insulating wall to form a bayonet corresponding to the number of the plurality of insulating walls and engaging with a plurality of the insulating walls.
  • the snap fit is a clearance fit.
  • a retaining wire shielding wall disposed opposite the wiring shielding wall, the charging conductor including a contact plate extending from one end into the inner side of the casing, the contact plate extending into an inner side of the casing A static contact is provided, the barrier shield wall being between the charged conductor of each phase and the end of the contact plate that projects into the inside of the housing.
  • the interphase insulating wall extends toward the inside of the charging conductor to an intermediate position near the charging conductor.
  • the interphase insulating wall extends toward an inner side of the charging conductor to be connected to the wire shielding wall, and the phase insulating wall and the wire shielding wall form a second surrounding structure.
  • the utility model further includes a shield cover connected between the wire protection wall and the wire protection wall, wherein the shield cover and the wire protection wall are arc-shaped.
  • a housing structure comprising a housing and a shield as described above, the respective inter-phase insulating wall portions of the shield being inserted into a gap between a live conductor mounted on the housing and an adjacent insulating barrier.
  • a gap structure is formed on the outer side edge of the insulating barrier wall and adjacent to the shield mounting position to form a line crawling along the surface of the phase-insulated wall starting from the outermost end position of the edge of the charged conductor. Then, it is folded toward the shortest leakage path along the surface of the wire shielding wall or the insulating barrier wall of the casing to the notch corner of the notch structure.
  • the protective cover for increasing the insulation performance of the contactor of the present invention, the intermediate insulating wall of the first surrounding structure is formed by forming a wall in the wiring protection wall and the wiring shielding wall, when the protective cover of the present invention is assembled to the contactor housing
  • the phase-insulating wall is inserted into a gap between the live conductor in the casing and the insulating barrier wall of the casing, thereby forcing the shortest leakage path to start crawling along the surface of the phase-insulated wall after starting from the outermost edge position of the live conductor, and then Folding upwards to the innermost edge position of the casing closest to the live conductor on the casing, and the vertical straight path of the shortest leakage path from the position of the outermost edge of the charged conductor in the prior art, the shortest leakage type of the fold line type of the present invention
  • the path extends the shortest leakage distance without increasing the volume of the contactor, thereby enhancing the insulation performance of the contactor.
  • the shield of the present invention for increasing the insulation properties of a contactor, the interphase insulating wall being vertically connected to the wiring protection wall and extending toward the inner side of the charging conductor, and the interphase insulating wall and the charged conductor along Projecting a plurality of projections of the direction of arrangement of the charged conductors at least partially coincident, the overlapping portions of the interphase insulating walls and the projected projections of the charged conductors directing the shortest leakage path from the edge of the charged conductor first along the phase-insulated wall
  • the surface crawls and improves the reliability of the shield to enhance the insulation performance of the contactor.
  • the protective cover for increasing the insulation performance of the contactor of the present invention, the bayonet forming a clearance fit with the corresponding insulating wall, the gap matching arrangement is beneficial to the installation of the wiring protection wall and the insulating wall, It is possible to ensure that the wiring protection wall is mounted on the insulating barrier wall without sloshing.
  • the protective cover for increasing the insulation performance of the contactor of the present invention further comprising a retaining wire protection wall disposed opposite the wall for the wiring protection, the retaining wire shielding wall blocking the charged conductor of each phase and the Between the ends of the contact plate extending into the inner side of the casing, the arrangement of the wire guard wall prevents an arc generated by the stationary or moving contact on the contact plate from entering the charged conductor.
  • the shield of the present invention for increasing the insulation properties of a contactor, the interphase insulating wall extending toward an inner side of the live conductor to an intermediate position adjacent to the live conductor, the arrangement of the interphase insulating wall being capable of guiding
  • the shortest leakage path from the edge of the charged conductor first creeps along the interphase insulating wall, and when the shield of the present invention is installed, the interphase insulating wall and the wire insulated wall are on the casing No interference occurs during installation.
  • the protective cover for increasing insulation properties of a contactor of the present invention the interphase insulating wall extending toward an inner side of the charging conductor to be connected to the retaining wire protective wall, the phase insulating wall and the retaining wire protective wall Forming a second surrounding structure, the interphase insulating wall is connected to the retaining wire protection wall and forming a second surrounding structure, although the mounting of the protective cover of the present invention is affected, the second surrounding structure is for the charged conductor
  • the shortest leakage path starting at the edge first creeps along the surface of the interphase insulating wall for further guiding, making the shield of the present invention more reliable.
  • the protective cover for increasing the insulation performance of the contactor of the present invention wherein the joint between the protective cover top cover and the wiring protection wall has an arc shape, and the structure has a good appearance and is advantageous for market promotion.
  • the protective cover for increasing the insulation performance of the contactor of the present invention the arrangement of the phase-to-phase insulating wall forcing the shortest leakage path of the contactor using the shield of the present invention to advance along the fold line, prolonging the shortest leakage distance, thereby enabling the use of the present invention
  • the size of the housing is smaller than that of the prior art contactor, that is, the upper edge of the housing of the contactor using the protective cover of the present invention can be formed. Lower, shrinking the volume of the casing, further reducing the size of the contactor product, in line with social development, and facilitating market promotion.
  • the protective cover provided by the invention for increasing the insulation performance of the contactor has a simple structure, has no special requirements in manufacturing, and is easy to realize automation and mass production.
  • the outer casing structure of the present invention comprising the above-mentioned protective cover structure and a casing, wherein the insulating barrier wall of the casing is formed with a notch structure toward the outer edge, and the outer casing is extended by the arrangement of the interphase insulating walls of the shield.
  • the notch structure By adopting the notch structure, not only the material of the contactor housing is saved, but also the contactor is made smaller, and the top of the contactor housing looks like a prominent "D" by the notch structure, and the appearance is good, which is favorable to the market. Promotion.
  • FIG. 1 is a schematic view showing the assembly structure of a shield and a casing in a prior art contactor
  • FIG. 2 is a schematic structural view of a prior art protective cover
  • FIG. 3 is a schematic diagram of a shortest leakage path of the prior art
  • Figure 4 is a schematic structural view of a protective cover of the present invention.
  • Figure 5 is a side cross-sectional view of the shield of the present invention assembled to the housing
  • Figure 6 is another side cross-sectional view of the shield of the present invention assembled to the housing
  • Figure 7 is a schematic view showing the structure of the casing of the present invention without a protective cover
  • Figure 8 is a schematic view of the housing assembly shield of the present invention and the shortest leakage path without the shield;
  • Figure 9 is a schematic structural view of a casing of the present invention.
  • Figure 10 is a schematic view showing the structure of the outer casing structure of the present invention after it is assembled to a contactor.
  • the reference numerals in the figure are: 1-shell, 11-insulation barrier, 21-wire protection wall, 211-bayonet, 22-phase insulation wall, 23-shield protection wall, 24-shield cover Cover, 3-tile connector screw, 31-watt plate, 4-contact plate, 5-wire, 6-gap, 7-notched structure, 71-notched corner.
  • the present invention provides a protective cover for increasing the insulation performance of the contactor, as shown in FIG. 4-6, mounted on the housing 1 of the contactor for preventing an operator from accidentally contacting the housing 1
  • a plurality of phase charged conductors include a contact plate 4, a tile-shaped terminal screw 3 mounted on the contact plate 4, a wire 5, and the like.
  • the shield is snapped over the live conductor from an open position of the housing 1 above the live conductor.
  • the shield includes a wiring protection wall 21 located outward of the charged conductor of each phase, and it should be noted that the outward direction refers to the charging.
  • the conductor is adjacent to one side of the edge of the casing 1, and the shield further includes a plurality of interphase insulating walls 22 disposed in the wiring shielding wall 21 and forming a first surrounding structure with the wiring shielding wall 21. a plurality of the interphase insulating walls 22 are evenly spaced and disposed between adjacent ones of the interphase insulating walls 22, and the plurality of the interphase insulating walls 22 are parallel to each other and are perpendicular to the wiring shielding wall twenty one;
  • the interphase insulating wall 22 is inserted into the gap 6 between the charging conductor and the insulating barrier 11 of the casing 1 to form the most charged conductor.
  • the outer edge position B starts to crawl linearly along the surface of the interphase insulating wall 22 to the lower end edge of the wiring protection wall 21, and then folds upward to the housing closest to the charged conductor on the casing 1.
  • the shortest leakage path E of the innermost edge position D is the interphase insulating wall 22 into the gap 6 between the charging conductor and the insulating barrier 11 of the casing 1 to form the most charged conductor.
  • the distance from the outermost edge position B of the charging conductor to the lower end edge of the wiring protection wall 21 of the shield is 3-5 mm, but is not limited to 3-5 mm, and the charging conductor
  • the distance from the outermost edge position B to the lower end edge of the wire protection wall of the shield may also be less than 3 or greater than 5 mm, when the outermost edge position B of the charging conductor and the wire protection wall 21 When the lower end edge is very close, the shortest leakage path starting from the outermost edge position B of the charging conductor will directly crawl upward along the outer surface of the wiring shielding wall 21 to the innermost edge of the casing 1.
  • the leakage path BCD shown in FIG. 8 may not be the shortest leakage path. Therefore, there is a preferable problem that the distance from the outermost edge position B of the charging conductor to the lower end edge of the first protective wall 21 of the shield, in the present embodiment, the outermost portion of the charged conductor The distance from the edge position to the lower end edge of the wire protection wall 21 of the shield is between 3-5 mm.
  • the shortest leakage path E is crawled to the lower end edge position of the wire protection wall 21 and then turned, and may crawl upward along the surface of the insulating barrier wall 11 or along The surface of the casing adjacent to the wiring protection wall 21 crawls upward and eventually crawls to the innermost edge position D of the casing.
  • the present embodiment Compared with the vertical straight path of the shortest leakage path of the shield 2 without the interphase insulating wall 22 in the prior art from the outermost edge position of the charging conductor (the straight path b shown in FIG. 3), the present embodiment
  • the shortest leakage path of the fold line type extends the shortest leakage distance without increasing the volume of the contactor, thereby enhancing the insulation performance of the contactor.
  • the position of the upper edge of the housing of the contactor using the shield of the present embodiment can be formed lower, thereby reducing the size of the housing and conforming to social development. It is conducive to market promotion.
  • the length direction of the wire protection wall 21 is parallel to the arrangement direction of the plurality of phased charged conductors, and the interphase insulating wall 22 and the wiring protection are provided.
  • the wall 21 Vertically connected by the wall 21 and extending toward the inside of the charging conductor such that the length of the interphase insulating wall 22 extending along the inner side of the charging conductor and the projection of the charging conductor in the direction of arrangement of the plurality of phase of the charging conductor are at least partially coincide.
  • the wiring protection wall 21 is formed at a position connected to the phase-insulating wall 22 to be formed in accordance with the number of the plurality of insulating barrier walls 11 and formed with a plurality of the insulating barrier walls 11.
  • the snap-fit bayonet 211 is snap-fitted.
  • the bayonet 211 forms a clearance fit with the insulating barrier wall 11 , and the clearance fit is beneficial to the installation of the wiring protection wall 21 and the insulating barrier wall 11 , and the wiring protection can be ensured. No sloshing occurs after the wall 21 is mounted to the insulating barrier wall 11.
  • the protective cover of the embodiment further includes a retaining wire shielding wall 23 disposed opposite the wiring shielding wall 21, the charging conductor including a contact plate extending from one end into the inner side of the casing 1, the contact plate extending A static contact is disposed on an end portion of the inner side of the casing 1, and the wire shielding wall 23 is blocked between the charged conductor of each phase and an end of the contact plate that protrudes into the inner side of the casing 1. between.
  • the arrangement of the baffle guard wall 23 prevents an arc generated by the static contact or the moving contact on the contact plate 4 from entering the portion of the live conductor close to the outside of the housing, thereby avoiding leakage of the contactor housing. phenomenon.
  • the interphase insulating wall 22 extends toward the inner side of the charging conductor to an intermediate position near the charging conductor. Specifically, the interphase insulating wall 22 extends toward the inner side of the charging conductor to an intermediate position of the tile 31 adjacent to the shoe-shaped terminal screw 3.
  • the arrangement of the interphase insulating wall 22 can guide the shortest leakage path starting from the edge of the charging conductor to first crawl along the interphase insulating wall 22, and can ensure the interphase insulation when the shield of the embodiment is installed.
  • the wall 22 and the barrier insulating wall do not interfere when mounted on the housing 1.
  • a position between the intermediate position of the tile 31 adjacent to the shoe-shaped terminal screw 3 and the second protective wall 23 is also a result of an optimized design, which is based on FIG.
  • the leakage path BCD approaches, but does not exceed, the best position resulting from the shortest leakage path associated with this location.
  • the interphase insulating wall 22 is designed to extend toward the inside of the charging conductor to be vertically connected to the retaining wall 23, the interphase insulating wall 22 is The retaining wire protection wall 23 forms a second surrounding structure, and the phase-to-phase leakage path at a position between the intermediate position of the tile-shaped piece 31 of the tile-shaped terminal screw 3 and the second protective wall 23 is further strengthened.
  • the leakage path at this time will be the uppermost edge from the lower edge extending downward from the interphase insulating wall 22 to its extending direction to the vertically upward upper edge of the insulating barrier wall 11 of the casing 1. Therefore, even if the shield of the present invention is applied to the prior art housing structure, it can increase the insulation performance of the contactor product, thereby achieving the purpose of reducing the height of the product.
  • the phase-to-phase insulating walls 22 are five, and correspondingly, the insulating barrier walls 11 matching the phase-to-phase insulating walls 22 are also five.
  • the present invention is not limited to the number of the interphase insulating walls 22 and the insulating barrier walls 11, and the interphase insulating walls 22 may be according to different number of main contact poles and auxiliary contacts of the contactors. 2, 3, 4, 6, 8, 10, etc., correspondingly, the insulating barrier wall 11 may also be 2, 3, 4, 6, 8, 10, and the like.
  • the shield further includes a wire guard wall 23 provided opposite to the wire protection wall 21.
  • the number of the wire guard walls 23 is the same as the number of the wire fences 21, and in the present embodiment, the wire guard wall 23 and the wire guard wall 21 are provided in four.
  • the shield of the present embodiment further includes a shield cover 24 connected between the wire protection wall 21 and the wire guard wall 23,
  • the connection between the protective cover top cover 24 and the wiring protection wall 21 is an arc shape, and the appearance is good, conforming to the personalized design of the contactor product, and is advantageous for market promotion.
  • the protective cover is an integral structure, and the wiring protection wall 21 and the protective cover top cover 24 are integrally provided.
  • the shape of the joint between the shield top cover 24 and the wire guard wall 21 in the present invention is not limited to an arc shape, and may be other conventional shapes such as a right angle shape.
  • the other outermost edge position A of the tile 31 in the live conductor is away from the innermost edge of the casing 1.
  • the position D is closest, so the shortest leakage distance is calculated from the other outermost edge position A of the tile 31, which is the other outermost edge position A of the tile 31,
  • the oblique straight line crawls to the innermost edge position D of the casing 1, and the shortest leakage distance is a linear distance between AD in FIG.
  • the shortest leakage path starts from the outermost edge position B of the tile 31 along the surface of the phase insulating wall 22.
  • Straight line crawling to the lower edge of the wire protection wall 21, and then linearly crawling upward along the surface of the wire protection wall 21 to the innermost edge position D of the casing 1 the shortest leakage distance is FIG.
  • the line distance of the ACD in the middle is the line distance of the ACD in the middle.
  • the shield in this embodiment is configured to make the shortest leakage path change from a straight line to a fold line by providing the phase-to-phase insulating wall 22, thereby prolonging the shortest leakage distance, which is advantageous for the miniaturization of the contactor.
  • the present embodiment provides a housing structure, which is part of a contactor, as shown in FIGS. 7, 9, and 10, including a housing 1 and a shield as described above, the respective insulating walls 22 of the shield Inserted into the gap 6 between the live conductor mounted on the casing 1 and the adjacent insulating barrier wall 11.
  • the housing is closest
  • the forming position of the innermost edge position of the charging conductor i.e., at the position of the notch corner point
  • the notch structure 7 is formed on the outer side edge of the insulating barrier wall 11 and near the shield mounting position.
  • the position of the notch corner point in the embodiment is the innermost edge position of the casing 1.
  • the formation of the notch structure not only saves the material of the casing, but also reduces the size of the casing, and the notch structure makes the top of the casing look like a "D", and the appearance is good, conforming to the personalized development of the contactor product. Conducive to market promotion.
  • the present invention is not limited to the structure in which the housing 1 has a notch.
  • the housing 1 may not be formed with a notched structure, because the interphase insulating wall 22 and the wiring protection wall 21 Forming the first surrounding structure such that the shortest leakage path of the contactor advances along the fold line, extending the shortest leakage distance, so that the housing 1 meets the requirement of the shortest leakage distance, relative to the prior art housing structure,
  • the position of the upper edge of the outermost edge position of the tile 31 adjacent to the shoe-shaped terminal screw 3 can be formed lower, so that the structure of the casing 1 is reduced relative to the prior art, saving the casing 1 Materials.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Patch Boards (AREA)
  • Insulating Bodies (AREA)
  • Breakers (AREA)
PCT/CN2015/070569 2014-01-14 2015-01-13 一种增加接触器绝缘性能的防护罩及外壳结构 WO2015106672A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BR112016015291-3A BR112016015291B1 (pt) 2014-01-14 2015-01-13 Cobertura de proteção para aumentar o desempenho de isolamento de um contator, e estrutura de alojamento
RU2016125544A RU2665470C2 (ru) 2014-01-14 2015-01-13 Защитная крышка для повышения изоляционных характеристик контактора и конструкция корпуса

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Application Number Priority Date Filing Date Title
CN201410015426.4 2014-01-14
CN201410015426.4A CN103745886B (zh) 2014-01-14 2014-01-14 一种增加接触器绝缘性能的防护罩及外壳结构

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WO2015106672A1 true WO2015106672A1 (zh) 2015-07-23

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CN (1) CN103745886B (ru)
BR (1) BR112016015291B1 (ru)
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WO (1) WO2015106672A1 (ru)

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CN103745887A (zh) * 2014-01-14 2014-04-23 德力西电气有限公司 一种防护罩旋转装配结构及具有该结构的接触器
CN103745886A (zh) * 2014-01-14 2014-04-23 德力西电气有限公司 一种增加接触器绝缘性能的防护罩及外壳结构
CN203674087U (zh) * 2014-01-14 2014-06-25 德力西电气有限公司 一种防护罩旋转装配结构及具有该结构的接触器
CN203674088U (zh) * 2014-01-14 2014-06-25 德力西电气有限公司 一种增加接触器绝缘性能的防护罩及外壳结构

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CN103745886B (zh) 2015-11-25
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BR112016015291B1 (pt) 2022-05-10
RU2016125544A3 (ru) 2018-06-27
RU2016125544A (ru) 2018-02-20

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