US3836740A - Vacuum type circuit interrupter having improved contacts - Google Patents

Vacuum type circuit interrupter having improved contacts Download PDF

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Publication number
US3836740A
US3836740A US00249990A US24999072A US3836740A US 3836740 A US3836740 A US 3836740A US 00249990 A US00249990 A US 00249990A US 24999072 A US24999072 A US 24999072A US 3836740 A US3836740 A US 3836740A
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US
United States
Prior art keywords
contact
arcing
annular
vacuum interrupter
base portion
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.)
Expired - Lifetime
Application number
US00249990A
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English (en)
Inventor
R Hundstad
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Westinghouse Electric Corp
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Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US00249990A priority Critical patent/US3836740A/en
Priority to GB1822873A priority patent/GB1423581A/en
Priority to DE2321753A priority patent/DE2321753A1/de
Priority to JP48048635A priority patent/JPS4941860A/ja
Priority to CA170,336A priority patent/CA979958A/en
Priority to CH631973A priority patent/CH567794A5/xx
Application granted granted Critical
Publication of US3836740A publication Critical patent/US3836740A/en
Priority to JP1981125303U priority patent/JPS5778538U/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
    • H01H33/6642—Contacts; Arc-extinguishing means, e.g. arcing rings having cup-shaped contacts, the cylindrical wall of which being provided with inclined slits to form a coil

Definitions

  • the direction in which the arc will move is, perpendicular to the current flow in the arc,
  • the contact assembly in the'present invention is designed so that the current conducting path through the contacts approximate straight parallel rails, for most effective are movement.
  • the contacts of the present invention are generally cup-shaped in design and in this respect resemble prior art cup-shaped designs such as US. Pat. No, 3,089,936 and US. Pat. No. 3,417,216, however, the embodiments here disclosed have significant advantages over prior art contacts.
  • One of the main advantages of sthe present invention stemsfrom the current carrying path through the contacts, which approximates straight parallel rails for effective are movement.
  • the embodiments disclosed in the present application make very effective use of the self-induced magnetic field in moving the arc over the contact surface and thereby distributing the are energy over the entire contact surface.
  • a pair of relatively movable cup-shaped contacts are disposed in a vacuum interrupter, the contacts have annular mating ridges which are divided into a plurality of contact surfaces.
  • the contact surfaces are formed so as to approximate parallel rails to produced maximum unbalance in the magnetic field distribution and rapid arc movement.
  • The will extend axially of the contacts, and the current path in the contact surfaces will extend substantially perpendicular to the arc, for most of the arc travel. Current flowing in the contact surfaces perpendicular to the arc will produce an intense magnetic field on the one side of the arc tending to move the arc rapidly around the annular contact ridge.
  • the contacts are cup-shaped with an inward facing lip portion forming an annular ring which is the contact surface.
  • the annular ring is slotted thereby dividing it into a plurality of contacts surfaces.
  • the slots are angled so as to drive the arc in a combined azimuthal and radial inward direction.
  • the angles of the slots cut in the annular ring and the amount by which the lip of the cup extends radially inward are factors which can be used to establish the angular velocity of the arc and its radial position. The are is thus driven inwardly and rotates rapidly around the inner periphery of the annular contacts surface until it is extinguished.
  • Forcing the arc in an inward direction is a very important feature since it has been found experimentally that current interruption limits are usually reached when the arc interacts with the shield.
  • This embodiment of the present invention tends to confine the arc to the inner electrode space and thereby prevent the are from interacting with the arc shield. By so confining the arc, the volume of the interrupter can be used more effectively and the radial distance separating the contacts and the main shield can be reduced.
  • each of these contact surfaces extend formed therebetween current flowing through the contact surfaces flows perpendicular to the arc to move the are rapidly inward and around the inner periphery of the annular ring formed by the contact surfaces.
  • All embodiments of this invention can be constructed to provide small relative motion between the contact surfaces when the contacts are closed so as to increase the number of contact points and thereby reduce contact resistance.
  • the rigidity of the contact surfaces can be controlled by varying wall thickness, the angle of the slots or slot spacing.
  • FIG. 1 is a sectional view of a vacuum circuit interrupter comprising a contact structure of one embodiment of the invention
  • FIG. 2 is an enlarged top view of the contact structure shown in FIG. 1; a
  • FIG. 3 is a side view of the contact structure shown in FIG. 2;
  • FIG. 4 is a sectional view taken along the line IVIV of FIG. 2;
  • FIG. 5 shows a pair of contacts of the type illustrated in FIG. 2 facing each other as they are disposed in a vacuum interrupter;
  • FIG. 6 is a side view of a contact structure illustrating a second embodiment of the invention.
  • FIG. 7 is a top view of the contact shown in FIG. 6;
  • FIG. 12 is a sectional view of thevcontact shown in FIG. along theline XII-XII;
  • FIG. 13 is a side view of a pair of contacts of the type shown in FIG. 10 as they are disposed in a vacuum interrupter.
  • the vacuum circuit interrupter 16 comprises a highly evacuated tubular envelope 18 formed from glass or suitableceramic material and a pair of metallic end caps 20 and 22 closing off the ends of the insulating envelope 18. Suitable seals 24 are provided between the end caps 20 and 22 and insulating envelope 18to render the inside of the insulating envelope l8 vacuum tight.
  • the pressure within the envelope 18 undernormal operating conditions is lower than 10" torr to assure that the mean free' path for electrons will be longer than the potential breakdown path within the envelope Located within the insulatingenvelopel8 are apair of relatively movable electrodes or contacts 26 and 28 as shown in FIG. 1 in their opencircuit position. When the contacts 26 and 28 are separated there is'formed an arcing gap 30 therebetween.
  • the upper contact 26 is a stationary contact secured to a conducting rod 32 by a suitable means, such as welding or brazing.
  • the conducting rod 32 is rigidly joined to the stationary end cap 20 by asuitable means, such as welding or brazing.
  • the lower contact 28 is a movable contact and isjoined to a conductive operating rod 34 by a suitable means, such as welding or brazing.
  • the operating rod 34 is'l'suitably mounted for movement along the longitudinal axis of the insulating envelope 18.
  • the operating rod- 34 projects through an opening 36 in the bellows end cap 22 as shown in FIG. 1.
  • a metal bellows 38 is secured in sealing relationship at its respective opposite ends to the operating rod 34 and to the opening 36 in the bellows end cap 22.
  • the flexible metallic bellows 38 provides a seal about the operating rod 34 to allow for movement of the operating rod 34 without impairing the vacuum within the envelope l8.
  • a suitable actuating means for driving the movable contact 28 upward into engagement with the stationary contact 26 so as to close the interrupter 16.
  • the closed position of the movable contact 28 is indicated by the dotted line 29.
  • the actuating means is also capable of returning the movable contact 28 to its open position, during circuit interruption.
  • the circuit opening operation will entail a typical gap length 30, when the contacts are fully separated, of approximately onehalf inch.
  • a pair of end shields 42 and 44 are provided at opposite ends of the main central shield 40.
  • the speed with which the vapors, generated during arcing, are removed determines the steady state operating condition during arcing, and also the recovery capability of the unit. If the vapor is not quickly removed high voltage transients may cause the arc to reignite, after it has been extinguished, resulting in failure of the interrupter 16.
  • the arc, interacting with the main shield 40-and melting a hole therethrough, is the cause of many of the failures noted in vacuum interrupters 1 6.
  • Electrode 28 is generally cup-shaped with an inward facing lip portion 47 which forms an annular contact ring 46.
  • the annular contact ring*46 lies in a plane which is perpendicular to the sides or walls 48 of the cup-shaped electrode 28.
  • the annular contact ring 46 is divided into aplurality of contact surfaces 50.
  • the contact surfaces 50 are formed by cutting slots 52 through the inward facing lip 47 and wall 48 of the cupshaped electrode 28.
  • the slots 52 can also be cut completely through the cup-shaped electrode 28. That is slots 52, as shown in FIG. 4, can be extended through the bottom portion 49 of the cup-shaped contact 28.
  • the contact 28 is thus made up of multiple contact surfaces 50 which are perpendicular to the walls 48 of the contacts 28.
  • the slots 52 made in the contact 28 are angled so as to make the contact surface 50 point in a somewhat circumferential or azimuthal direction.
  • any arc 54, .as shown in FIG. 5, which is formed when the electrodes 26 and 28 are separated during current intertuption is driven in a combined azimuthal (circumferential) and radial inward direction. This tends to confine the are 54 to the inner .electrode or arcing gap space and thereby prevents the are 54 from interacting with the arc shield 40.
  • the angle of the slots 52 cut in the cup-shaped contact 28 and the amount by which the annular contact ring .46 extends radially inward, are factors which can be used to establish the angular velocity and the radial position of the are 54. Note that the slots 52 in contact 26 are opposite those in contact 28 so that when contacts 26 and 28 are disposed in a vacuum interrupter 16, face-to-face as shown in FIG. 5, they tend to move the arc in the same direction.
  • Contacts 26 and 28 are positioned so that the contact surfaces 50 of contacts 26 and '28 face each other and approximate straight parallel rails so as to produce the greatest unbalance in the magnetic field distribution and therefore the greatest magnetic force to drive the arc in a specified predetermined direction.
  • the current path through contact 28 is up the contact wall 48 and through one of the contact surfaces 50 to the arc 54, so that the current path in the contact surface 50 is at substantially a right angle to the longitudinal axis of the are 54.
  • the arc is driven inward and rotates rapidly around the inner periphery 58 of the annular ring 46 until the are 54 is extinguished, which occurs on an alternating current circuit at approximately the first current zero.
  • the contact 60 is generally cupshaped with an annular contact surface 63 which is divided into multiple contact surfaces 64.
  • the walls 66 of the cup-shaped contact 60 are formed so that current flowing to the are 54 during circuit interruption must flowthrough the contact surfaces 64 perpendicular to the axis of the are 54.
  • Current flow to the contact surfaces 64 is through a restricted portion 68 so that current flowing in the contact surfaces 64 flows at substantially a right angle to the are 54.
  • contact 62 is a mirror image of contact 60.
  • the contacts 60 and 62 are disposed in a vacuum interrupter 16 so that the contact surfaces 64 approximate parallel rails, and during circuit interruption the are 54 is driven rapidly around the annular contact surface 63, in the direction indicated by arrow'65, until it is extinguished.
  • Current to the are 5.4 during the major portion ,of the arc travel must flow through the contact surfaces 64 at substantially a right angle to the axis of the are 54 to produce a greater unbalance in a magnetic field dis- .tribution and'therefore a greater magnetic field to drive the arc in a more predetermined or controlled direction than in the prior arc contact structures.
  • FIGS. l0, l1, l2 and 13 there is shown a third embodiment of the invention on a contact structure'72.
  • Contact 72 has a disc-shaped portion 73 with contact surfaces 76 attached at points 78 around the outer perimeter of the disc-shaped portion 73.
  • Contact surfaces 76 can be made integral with the disc-shaped portion 73, or contact portion 76 can be attached to the disc-shaped portion 73 by a suitable means, such as welding or brazing.
  • the contact surfaces 76 are attached to the disc-shaped surface 73 at points 78, and at other areas are separated from the surface 73 by a slight gap.
  • the contact surfaces 76 point in a generally radially inward and circumferential direction.
  • .Contact 74 as shown in FIG. 13 is a mirror image of the contact 72 through a plane perpendicular to the longitudinal axis of the operating rod 34 and the stationary rod 32 and located midway between contacts 72 and 74.
  • An arc 54 forms during circuit interruption and is driven rapidly inward and around the inner edge 80 of the contact surfaces 76.
  • the contact surface 76 are in a plane which is parallel to the top of the discshaped portion 73.
  • the contact surfaces 76 of contacts 72 and 74 face each other so as .to approximate straight parallel rails.
  • Current flowing through the contact surfaces 76 to the arc 54 flows at right angles to the are 54 so as to produce the greatest unbalance in the self-induced magnetic field distribution and therefore to move the arc most efficiently in a specified direction.
  • the are 54 moves around the contacts 72 and 74 in the direction indicated by arrow 65.
  • This construction of contact 72 drives the arc in a combined azimuthal (circumferential) and radial inward direction.
  • the arc 54 is generally confined to the inner electrode or arcing space 30 and is thereby prevented from interacting with the arc shield 40. This is very important since it has been determined experimentally that current interruption limits are reached when the arc 54 interacts with the shield 40. In most cases a hole is melted in the arc shield 40 and the interrupter 16 fails. By a partial confinement as suggested by this embodiment the volume of the interrupter can be used more effectively. The radial distance separating the contacts 72 and 74 and the arc shield 40 can be reduced.
  • the contact surfaces 76 are separated from each other by slots 84, and are separated from the disc-shaped portion 73 of the electrode 72 by gaps 86.
  • the configuration of these separations 84 and 86 and the amount by which the contact surfaces 76 project toward the center of the disc-shaped portion 73, beyond the attachment point 78, are factors which can be used in establishing the angular velocity of the are 54 and its radial inward position.
  • the contact structures have several advantages, for instance the contact surfaces 50, 64 and 76 can be supported for slight relative motion so as to increase the number of contact points and thereby reduce contact resistance when the interrupter 16 is closed.
  • Another advantage of contacts 28 and 72 is that the arc 54 is forced radially inward and is prevented from interacting with the arc shield 40. All contacts configurations 28, 60 and 72 effectively employ stress concentration to aid in breaking any welds which might occur between the contacts.
  • annular contact and arcing portion having a relatively thin cross-sectional area and being divided into a plurality of contact and arcing surfaces; contact support means for supporting each contact and arcing surface from one end only and for positioning said annular contact and arcing portion slightly above said disc-shaped portion by a distance less than the thickness of said annular contact and arcing portion; and each of said contact and arcing surfaces connected to said flat circular base portion near the outer periphery and extending from the connection in a radially inward and circumferential direction so that the arc formed during circuit interruption is moved radially inward and rotated around the inner diameter of said annular contact and arcing portion.
  • a vacuum interrupter as claimed in claim 2 wherein most of the contact support means for each contact and arcing surface is positioned beneath the preceding contact and arcing surface whereby the current flow through the contact and arcing surfaces during arcing must be substantially parallel to said flat circular base portion and perpendicular to any arc formed during circuit interruption.
  • each of saidv contact support means is joined to said flat circular base portion in a trapezoidal shaped"- figuration with two sides of the trapezoid extending generally radially inward a'distance from the outer periphery of said flat circular base portion less than the radially inward spacing of said annular contact and arcing portion; and
  • a vacuum interrupter as claimed in claim 1 wherein said contact support means supports said contact and arcing portion above said disc-shaped portion by a distance less than the length of the arcing gap.

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  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
US00249990A 1972-05-03 1972-05-03 Vacuum type circuit interrupter having improved contacts Expired - Lifetime US3836740A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00249990A US3836740A (en) 1972-05-03 1972-05-03 Vacuum type circuit interrupter having improved contacts
GB1822873A GB1423581A (en) 1972-05-03 1973-04-16 Vacuum type circuit interrupter having contacts
DE2321753A DE2321753A1 (de) 1972-05-03 1973-04-30 Vakuum-unterbrecher
JP48048635A JPS4941860A (enrdf_load_stackoverflow) 1972-05-03 1973-05-02
CA170,336A CA979958A (en) 1972-05-03 1973-05-03 Vacuum type circuit interrupter having improved contacts
CH631973A CH567794A5 (enrdf_load_stackoverflow) 1972-05-03 1973-05-03
JP1981125303U JPS5778538U (enrdf_load_stackoverflow) 1972-05-03 1981-08-26

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00249990A US3836740A (en) 1972-05-03 1972-05-03 Vacuum type circuit interrupter having improved contacts

Publications (1)

Publication Number Publication Date
US3836740A true US3836740A (en) 1974-09-17

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ID=22945851

Family Applications (1)

Application Number Title Priority Date Filing Date
US00249990A Expired - Lifetime US3836740A (en) 1972-05-03 1972-05-03 Vacuum type circuit interrupter having improved contacts

Country Status (6)

Country Link
US (1) US3836740A (enrdf_load_stackoverflow)
JP (2) JPS4941860A (enrdf_load_stackoverflow)
CA (1) CA979958A (enrdf_load_stackoverflow)
CH (1) CH567794A5 (enrdf_load_stackoverflow)
DE (1) DE2321753A1 (enrdf_load_stackoverflow)
GB (1) GB1423581A (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941961A (en) * 1973-10-18 1976-03-02 Siemens Aktiengesellschaft Contact arrangement for a vacuum switch
DE2708596A1 (de) * 1976-09-23 1978-03-30 Sprecher & Schuh Ag Metallgekapselte hochspannungsanlage
US4149050A (en) * 1975-01-10 1979-04-10 Westinghouse Electric Corp. Cup-shaped contacts for vacuum interrupters having a continuous annular contact surface
US4386249A (en) * 1980-11-25 1983-05-31 Westinghouse Electric Corp. Vacuum circuit interrupter with auxiliary contact for plural arc path device with arc rotating means associated with the primary and auxiliary contacts
US4695689A (en) * 1984-11-22 1987-09-22 Hitachi, Ltd. Vacuum circuit breaker
US4797522A (en) * 1988-02-11 1989-01-10 Westinghouse Electric Corp. Vacuum-type circuit interrupter
US5777287A (en) * 1996-12-19 1998-07-07 Eaton Corporation Axial magnetic field coil for vacuum interrupter
WO2013048609A1 (en) 2011-09-28 2013-04-04 Eaton Corporation Vacuum switch and hybrid switch assembly therefor
US9552941B1 (en) 2015-08-24 2017-01-24 Eaton Corporation Vacuum switching apparatus and electrical contact therefor
US9922777B1 (en) 2016-11-21 2018-03-20 Eaton Corporation Vacuum switching apparatus and electrical contact therefor
CN108369872A (zh) * 2015-09-18 2018-08-03 Abb瑞士股份有限公司 具有增强的电弧吹动效应的低压电接触系统
US10410813B1 (en) 2018-04-03 2019-09-10 Eaton Intelligent Power Limited Vacuum switching apparatus and electrical contact therefor

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5816731B2 (ja) * 1977-12-28 1983-04-01 株式会社明電舎 真空しや断器の電極
JPS55161166A (en) * 1979-05-31 1980-12-15 Hideo Kurashima Building
DE3422949A1 (de) * 1984-06-19 1985-12-19 Siemens AG, 1000 Berlin und 8000 München Vakuumschaltroehre mit einer spule zum erzeugen eines magnetfeldes
DE3644453A1 (de) * 1986-12-24 1988-07-07 Licentia Gmbh Schaltstueck fuer leistungsschalter
JPH0696919B2 (ja) * 1989-02-08 1994-11-30 鹿島建設株式会社 窓のない室の構造
DE19934909C1 (de) 1999-07-21 2001-06-13 Siemens Ag Kontaktanordnung für eine Vakuumschaltröhre
AU2001264342A1 (en) 2000-06-07 2001-12-17 Young-Jun Choi Building structure

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3089936A (en) * 1960-02-23 1963-05-14 Gen Electric Contact structure for an electric circuit interrupter
FR1410884A (fr) * 1963-10-09 1965-09-10 Ass Elect Ind Perfectionnements apportés à des contacts destinés à des interrupteurs à vide
GB1090872A (en) * 1964-02-11 1967-11-15 Ass Elect Ind Improvements relating to vacuum switches
FR1505699A (fr) * 1965-12-16 1967-12-15 Ass Elect Ind Perfectionnements aux contacts d'interrupteurs dans le vide
US3366762A (en) * 1965-04-16 1968-01-30 Gen Electric Arc controlling electrodes for switches and gaps
US3546406A (en) * 1966-11-21 1970-12-08 Westinghouse Electric Corp Vacuum-type circuit interrupter with hollow contacts
US3622724A (en) * 1970-02-24 1971-11-23 Gen Electric Vacuum-type circuit interrupter having contacts with improved arc-revolving means

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1098862A (en) * 1963-10-09 1968-01-10 Ass Elect Ind Improvements relating to vacuum switch contact assemblies
GB1113837A (en) * 1966-04-25 1968-05-15 Ass Elect Ind Improvements relating to vacuum switch contacts

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3089936A (en) * 1960-02-23 1963-05-14 Gen Electric Contact structure for an electric circuit interrupter
FR1410884A (fr) * 1963-10-09 1965-09-10 Ass Elect Ind Perfectionnements apportés à des contacts destinés à des interrupteurs à vide
GB1090872A (en) * 1964-02-11 1967-11-15 Ass Elect Ind Improvements relating to vacuum switches
US3366762A (en) * 1965-04-16 1968-01-30 Gen Electric Arc controlling electrodes for switches and gaps
FR1505699A (fr) * 1965-12-16 1967-12-15 Ass Elect Ind Perfectionnements aux contacts d'interrupteurs dans le vide
US3546406A (en) * 1966-11-21 1970-12-08 Westinghouse Electric Corp Vacuum-type circuit interrupter with hollow contacts
US3622724A (en) * 1970-02-24 1971-11-23 Gen Electric Vacuum-type circuit interrupter having contacts with improved arc-revolving means

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941961A (en) * 1973-10-18 1976-03-02 Siemens Aktiengesellschaft Contact arrangement for a vacuum switch
US4149050A (en) * 1975-01-10 1979-04-10 Westinghouse Electric Corp. Cup-shaped contacts for vacuum interrupters having a continuous annular contact surface
DE2708596A1 (de) * 1976-09-23 1978-03-30 Sprecher & Schuh Ag Metallgekapselte hochspannungsanlage
US4386249A (en) * 1980-11-25 1983-05-31 Westinghouse Electric Corp. Vacuum circuit interrupter with auxiliary contact for plural arc path device with arc rotating means associated with the primary and auxiliary contacts
US4695689A (en) * 1984-11-22 1987-09-22 Hitachi, Ltd. Vacuum circuit breaker
US4797522A (en) * 1988-02-11 1989-01-10 Westinghouse Electric Corp. Vacuum-type circuit interrupter
US5777287A (en) * 1996-12-19 1998-07-07 Eaton Corporation Axial magnetic field coil for vacuum interrupter
US8653396B2 (en) 2011-09-28 2014-02-18 Eaton Corporation Vacuum switch and hybrid switch assembly therefor
WO2013048609A1 (en) 2011-09-28 2013-04-04 Eaton Corporation Vacuum switch and hybrid switch assembly therefor
US9552941B1 (en) 2015-08-24 2017-01-24 Eaton Corporation Vacuum switching apparatus and electrical contact therefor
CN108369872A (zh) * 2015-09-18 2018-08-03 Abb瑞士股份有限公司 具有增强的电弧吹动效应的低压电接触系统
US10269508B2 (en) * 2015-09-18 2019-04-23 Abb Schweiz Ag Low voltage electrical contact system with enhanced arc blow effect
CN108369872B (zh) * 2015-09-18 2019-06-28 Abb瑞士股份有限公司 具有增强的电弧吹动效应的低压电接触系统
US9922777B1 (en) 2016-11-21 2018-03-20 Eaton Corporation Vacuum switching apparatus and electrical contact therefor
US10490363B2 (en) 2016-11-21 2019-11-26 Eaton Intelligent Power Limited Vacuum switching apparatus and electrical contact therefor
US10410813B1 (en) 2018-04-03 2019-09-10 Eaton Intelligent Power Limited Vacuum switching apparatus and electrical contact therefor

Also Published As

Publication number Publication date
JPS5778538U (enrdf_load_stackoverflow) 1982-05-14
CH567794A5 (enrdf_load_stackoverflow) 1975-10-15
JPS4941860A (enrdf_load_stackoverflow) 1974-04-19
CA979958A (en) 1975-12-16
GB1423581A (en) 1976-02-04
DE2321753A1 (de) 1973-11-15

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