US3053955A - Electrical contactors or circuit breakers - Google Patents

Electrical contactors or circuit breakers Download PDF

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Publication number
US3053955A
US3053955A US814045A US81404559A US3053955A US 3053955 A US3053955 A US 3053955A US 814045 A US814045 A US 814045A US 81404559 A US81404559 A US 81404559A US 3053955 A US3053955 A US 3053955A
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US
United States
Prior art keywords
shroud
chamber
contacts
contact
slide
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
US814045A
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English (en)
Inventor
Baldwin Harold Townley
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Individual
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Individual
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Filing date
Publication date
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Application granted granted Critical
Publication of US3053955A publication Critical patent/US3053955A/en
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
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • H01H9/446—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using magnetisable elements associated with the contacts

Definitions

  • the invention comprises a shroud formed of substantially semi-circular or D shape exposed to the atmosphere and closed at both ends by end plates with a stationary contact mounted in one end plate to project near to but out of contact with a ring or plate of magnetic material mounted intermediate the ends of the shroud, and a moving contact projecting into the chamber enclosed by the shroud and mounted on a slide for movement vertically into and out of engagement with the stationary contact, the ring or plate producing a circular magnetic field which prevents the arc from spreading sideways and promotes efficient arc control.
  • the normal requirements of electrical clearance will result in a chamber of large volume and the etfiective volume of air contained in the shroud chamber may be reduced by the employment of an inner shroud of substantially semi-circular or D shape, carried by the closed end of the outer shroud, and projecting from the closed end to adjacent the ring or plate.
  • a common slide carrying both movable contacts is mounted between the substantially semi-circular or D-shaped shrouds mounted in casings bolted together to sandwich the slide therebetween.
  • Two or more shrouds may be mounted side by side in the casing for simultaneously breaking single or multiphase circuits.
  • FIGURE 1 is a perspective exploded view of a three phase double pole contactor or circuit breaker showing the upper and lower end plates and the intermediate slide carrying the moving contacts;
  • FIGURE 2 is an elevation partly in section showing one shroud chamber
  • FIGURE 3 is a horizontal section through the casing and slide on line 3-3, FIGURE 4;
  • FIGURE 4 is a vertical section at right angles to FIG- URE 3
  • FIGURE 5 is an elevation of one shroud chamber showing an inner shroud therein;
  • FIGURE 6 is a section on line 66, FIGURE 5;
  • FIGURE 7 is a plan view from below of a modification.
  • FIGURES 1 to 4 illustrate the invention applied to a three phase circiut breaker in which the contactor or circuit breaker comprises a casing formed in two sections, 1, 2 and bolted together by bolts passing through holes 3 therein between which is mounted a slid-e 4 carrying moving contacts 5.
  • Each section '1 or 2 is divided by partition walls 6 into compartments, the partition walls 6 extending inwardly of the casing to engage grooves 7 in the slide 4 to form interphase barriers therefor.
  • a shroud 8 of magnetic or non-magnetic material substantially semi-circular or D shape with flanges 10 to enter recesses in the casing is mounted in each compartment of the casing and is enclosed at each end by end plates 16, 17, the outer periphery of the shroud being exposed to the atmosphere.
  • a stationary contact 9 is mounted in the end plate 16 of the casing to project into the chamber A enclosed by the shroud and the slide and at the ends by end plates 16, 17. Intermediate the ends of the chamber A a disc or plate 11 of magnetic material of the same contour as the shroud is secured therein as shown or it may enter a groove in the shroud.
  • the stationary contact 9 extends in close proximity to the disc or plate but out of contact therewith.
  • the contact 9 may be provided with a shoulder to engage a recess in the casing and is formed with a screwed or other shank to receive a nut for attachment of the lead thereto.
  • the shroud is shown as being of metal to provide good heat conductivity so that, as the outer surface is exposed to atmosphere, heat is readily transferred thereto and the shroud is cooled, but the shroud may be formed of insulating material provided this material will withstand the heat generated by the arc.
  • the slide 4 is provided with the grooves 7 on both surfaces to receive the partition walls 6 which act as interphase barriers.
  • the moving contacts 5 for a double break contactor or circuit breaker are mounted on the ends of a bar 12 supported on a member 13 spring mounted in the slide 4 with the bar 12 projecting at each side of the slide to extend into the chamber A in line with the stationary contacts 9.
  • the bottom of the slide 4 is provided with a member 14 by which slide 4 is actuated to make or break the contacts.
  • a limited volume of air can enter the chamber A along the bars 12 but no air will enter during the formation of an are on breaking of the contacts since the heat generated by the arc causes the air in the chamber A to expand and accordingly the pressure in the chamber A rises to more than atmospheric.
  • FIGURES 5 and 6 are arranged inside the shroud 8, the shroud 15 being mounted on the end wall of the casing remote from the stationary contact 9 and extending adjacent to the stationary contact, the end of the shroud 15 adjacent the stationary contact being open.
  • An annular air cushion B (FIGURE 6) is provided between the two shrouds 8, 15, which does not participate in the breaking operation.
  • the shroud 15 is preferably metal and provided with an end plate of similar material to withstand the heat generated by the are but it may be of insulating material provided this latter will withstand the temperature.
  • the casing is moulded to accommodate a single shroud 8 and the slide 4 moves in the casing and carries a single movable contact 5.
  • FIG. 7 An alternative form of shroud (FIGURE 7) comprises metal laminates 18 of magnetic or non-magnetic material of U or ring form insulated from each other by laminates of insulating material 19 and projecting into the arc chamher to a less extent than the metal laminates 18. In this way the insulation material 19 is kept at a safe distance from the high temperature arc, and the projecting metal laminates 18 forming the shroud reduce the volume of air in the arc chamber.
  • all these laminates 18 forming the shroud may be of U shape, but for the breaking of higher currents one or more of these laminates 18a should be of magnetic material and of ring form, and of the general shape shown in FIGURE 7, to control the magnet field and thus the arc movement and operate as described in connection with the plate 11.
  • an electrical contact making and breaking device having a stationary contact and a movable contact engageable with said stationary contact and substantially aligned therewith long a longitudinal axis, a fixed housing defining a substantially enclosed chamber wherein said stationary and movable contacts are disposed and engage, said stationary contact being disposed near one end of said chamber and having an engagement surface extending radially with respect to said longitudinal axis and facing toward the opposite end of said chamber, a member extending into said chamber and mounting said movable contact in a position facing said stationary contact, displacement means mounted on said housing but exteriorly of said chamber for displacing said member together with said movable contact along said longitudinal axis, said movable contact being displaceable by said displacement means between a first position in electrical contact with said surface of said stationary contact and a second position spaced therefrom along said longitudinal axis but within said chamber, said housing comprising opposed end walls spaced apart along said longitudinal axis in transverse relationship thereto and delimiting the opposite ends of said chamber with one of said end walls fixedly mounting said stationary contact

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Breakers (AREA)
US814045A 1959-03-14 1959-05-18 Electrical contactors or circuit breakers Expired - Lifetime US3053955A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8907/59A GB951588A (en) 1959-03-14 1959-03-14 Improvements in electrical contactors and circuit breakers

Publications (1)

Publication Number Publication Date
US3053955A true US3053955A (en) 1962-09-11

Family

ID=9861620

Family Applications (1)

Application Number Title Priority Date Filing Date
US814045A Expired - Lifetime US3053955A (en) 1959-03-14 1959-05-18 Electrical contactors or circuit breakers

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US (1) US3053955A (xx)
GB (1) GB951588A (xx)
NL (1) NL239190A (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1189178B (de) * 1963-03-01 1965-03-18 Licentia Gmbh Kontaktapparat fuer elektrische Schaltgeraete, z. B. Schuetze

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3215919C2 (de) * 1982-04-29 1986-09-04 Brown, Boveri & Cie Ag, 6800 Mannheim Explosionsgeschütztes oder schlagwettergeschütztes elektrisches Schaltgerät

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2058656A (en) * 1934-10-17 1936-10-27 Anderson James Electric switch
US2227134A (en) * 1938-02-26 1940-12-31 Gen Electric Electric circuit interrupter
US2240623A (en) * 1939-10-26 1941-05-06 Westinghouse Electric & Mfg Co Circuit interrupting device
US2650971A (en) * 1950-06-08 1953-09-01 Allen Bradley Co Electrical switch
US2692318A (en) * 1951-03-31 1954-10-19 Clark Controller Co Arc chamber for circuit breakers
US2794093A (en) * 1954-01-28 1957-05-28 Morschel Franz Multi-pole relay switches
US2794882A (en) * 1945-03-21 1957-06-04 Cutler Hammer Inc Electric switch operating structure
US2874245A (en) * 1954-01-19 1959-02-17 Gen Motors Corp Circuit breaker
FR1180131A (fr) * 1957-07-26 1959-06-02 Perfectionnements aux contacteurs et interrupteurs

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2058656A (en) * 1934-10-17 1936-10-27 Anderson James Electric switch
US2227134A (en) * 1938-02-26 1940-12-31 Gen Electric Electric circuit interrupter
US2240623A (en) * 1939-10-26 1941-05-06 Westinghouse Electric & Mfg Co Circuit interrupting device
US2794882A (en) * 1945-03-21 1957-06-04 Cutler Hammer Inc Electric switch operating structure
US2650971A (en) * 1950-06-08 1953-09-01 Allen Bradley Co Electrical switch
US2692318A (en) * 1951-03-31 1954-10-19 Clark Controller Co Arc chamber for circuit breakers
US2874245A (en) * 1954-01-19 1959-02-17 Gen Motors Corp Circuit breaker
US2794093A (en) * 1954-01-28 1957-05-28 Morschel Franz Multi-pole relay switches
FR1180131A (fr) * 1957-07-26 1959-06-02 Perfectionnements aux contacteurs et interrupteurs

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1189178B (de) * 1963-03-01 1965-03-18 Licentia Gmbh Kontaktapparat fuer elektrische Schaltgeraete, z. B. Schuetze

Also Published As

Publication number Publication date
NL239190A (xx)
GB951588A (en) 1964-03-04

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