US2816994A - Circuit interrupter - Google Patents

Circuit interrupter Download PDF

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Publication number
US2816994A
US2816994A US545044A US54504455A US2816994A US 2816994 A US2816994 A US 2816994A US 545044 A US545044 A US 545044A US 54504455 A US54504455 A US 54504455A US 2816994 A US2816994 A US 2816994A
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United States
Prior art keywords
tubular member
contact
trailer
rod
sleeve
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Expired - Lifetime
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US545044A
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English (en)
Inventor
John J Mikos
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.)
S&C Electric Co
Original Assignee
S&C Electric Co
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Filing date
Publication date
Priority to DENDAT1074122D priority Critical patent/DE1074122B/de
Application filed by S&C Electric Co filed Critical S&C Electric Co
Priority to US545044A priority patent/US2816994A/en
Application granted granted Critical
Publication of US2816994A publication Critical patent/US2816994A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/76—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid wherein arc-extinguishing gas is evolved from stationary parts; Selection of material therefor

Definitions

  • This invention relates, generally, to electric circuit interrupters and it has particular relation to construction of trailers for use in load interruptor devices such as shown in United States Patent No. 2,591,950, issued April 8, 1952, and in application Serial No. 493,083, led March 9, 1955.
  • Figure 1 is a longitudinal vertical sectional view of an l auxiliary circuit interrupter in which the present invention is embodied;
  • Figure 2 is a vertical sectional view, at an enlarged scale, of the trailer assembly shown in Figure 1;
  • FIG. 3 is a fragmentary View showing a modified construction for the upper end of the trailer assembly shown in Figure 2;
  • Figure 4 is another fractional view, similar to Figure 3, and showing still another modification.
  • Figure 5 is a View, similar to Figure 2, showing a modified construction.
  • the auxiliary circuit interrupter 1t includes a tubular insulating housing 11 provided with an upper terminal, shown generally at 12, which is arranged to be connected to a stationary terminal of a disconnecting fuse or a disconnecting switch.
  • an inner insulating sleeve 13 which is movable relative thereto and is mounted on a conducting arm 14 that is arranged to be connected to the movable terminal of a disconnecting fuse or disconnecting switch for placing the auxiliary circuit interrupter 10 in shunt circuit relation with the terminals of the disconnecting fuse or disconnecting switch as the case may be.
  • a conductor rod 15 having a cam terminal 16 at its lower end and connected at its lower end by a flexible conductor 17 to a movable arcing terminal 18 having a central bore 18.
  • the movable arcing terminal 18 engages a cylindrical contact assembly, shown generally at 19, that is carried by the conducting arm 14 and moves conjointly therewith and with the inner insulating sleeve 13.
  • a tubular metallic sleeve 20 Extending upwardly from the movable arcing terminal 18 an movable conjointly therewith is a tubular metallic sleeve 20 that is arranged to be engaged by a trigger 21 which is carried by the upper end of the inner insulating sleeve 13.
  • the trigger 21 engages the upper end of the tubular metallic sleeve 20 and causes it to move downwardly conjointly with the inner insulating sleeve 13 thereby maintaining the movable arcing terminal 18 in engagement with the cylindrical contact assembly 19.
  • the flexible conductor 17 is extended and a coil spring 22, interconnecting the cam terminal 16 and the movable arcing terminal 18 is stressed until the trigger 21 engages the cam terminal 16 and is moved out of engagement with the upper end of the tubular metallic sleeve 20.
  • the spring 22 contracts and moves the arcing terminal 18 upwardly together with the tubular metallic sleeve 20.
  • the arcing terminal 18 moves upwardly through a liner 23 of insulating material that evolves an arc extinguishing medium due to the heat of the arc and thus assists in extinguishing the same.
  • a trailer stud or insulating rod 26 that is formed of high strength insulating material such as a glass lled polyester resin.
  • the trailer stud or insulating rod 26 extends entirely through a trailer 27 in the form of a tubular member of insulating material that is capable of evolving an arc extinguishing medium when subjected to the heat of the arc.
  • the trailer 27 is formed of methyl methacrylate resin as is the liner 23.
  • other arc extinguishing materials can be employed which have the required electrical and mechanical characteristics.
  • the trailer stud or insulating rod 26 fits loosely in an opening or bore 28 in the trailer 27.
  • the diameter of the opening or bore 28 is slightly greater than the diameter of the trailer stud or insulating rod 26 to provide the loose fit.
  • the upper projecting end 29 of the trailer stud or insulating rod 26 is of reduced diameter for receiving a metallic fitting 30 in the form of a reenforcing sleeve of metal such as aluminum. It Will be noted that the metallic fitting 30 is telescoped over the projecting end 29.
  • An opening 31 extends transversely through the projecting end 29 and the metallic fitting 30 for receiving a pin 32, Figure 1, which flexibly secures the trailer assembly to the movable arcing terminal 18 with the end 29 and overlying fitting 30 telescoped within the bore 18.
  • the reason for einploying the metallic fitting 30, here in the form of a sleeve of metal, is to reenforce the end 29 of the trailer stud or insulating rod 26 where it is connected to the movable arcing terminal 18.
  • the metallic fitting 30 is secured by a suitable cement to the project- 3 ing end 29. This construction provides a strong and somewhat llexible coupling to the arcing terminal 18 in the confined space in the bore 18'.
  • the trailer stud or insulating rod 26 extends entirely through the trailer 27.
  • the reason for this construction is to make certain that even though the trailer 27 might become broken intermediate its ends, still it would move as a unit together with the movable arcing terminal l. lt will be appreciated that the trailer 27 is subjected to severe shock when the trigger 2l is released from the tubular metallic sleeve 20 and the spring 22 accelerates the arcing terminal 18 and the trailer 27 attached thereto during the circuit opening operation. Likewise, the trailer 27 is subject to severe shock when it is stopped at the end of its travel. Accordingly, the trailer stud or insulating rod 26 is connected to the trailer 27 at the end remote from the connection to the movable arcing terminal 18.
  • a sleeve 34 of insulating material by suitable cement to the lower end of the trailer stud or insulating rod 26.
  • the sleeve is formed of the same material as the trailer stud 25.
  • lt is desirable to provide a lluid tight seal between the trailer stud 26 and the trailer 27 in order to prevent the low through the bore 28 of the gaseous products of the arm.
  • a gasket 35 in the form of an O ring of rubber is provided at the base of the sleeve 34 which forms a head portion for the lower end of the trailer stud 26.
  • the gasket 35 ts snugly with the outer surface of the lower end of the trailer stud 26 and with the surface of an annular groove 36 in the trailer 27.
  • the arc drawn on separation of the arcing terminal ld from the contact assembly 19 may impinge upon the metallic tting 3l) and cause erosion of the same. ln order to avoid this the construction shown in Figure 3 can be employed. lt will be observed that the arcing terminal 18 is provided with a contact tip 1S and that the end 29 of the trailer stud or insulating rod 26 projects therethrough into the central bore 1S of the arcing terminal 18.
  • the sleeve 3'7 protect the underlying metallic sleeve 30 from erosion by the arc but also it evolves an arc extinguishing medium to repel the arc from its surface. In addition it prevents the application of heat from the arc and from Contact tip ld to the metallic sleeve 3) which otherwise would tend to injure the cement bond holding it to the end 29 of the stud or rod 26 and it cooperates with the sleeve 3d, Figure 2, forming the head portion for the insulao ing rod 26, to prevent relative endwise movement of the rod 26 and the sleeve 27.
  • the sleeve 37 has a close fit with the surface of the counterbore T19 and thus provides a seal at the upper end of the bore 28 the lower end of which is sealed by the gasket 35.
  • Figure 4 shows another modification of the upper end construction ot the trailer. It will be observed that a metallic fitting 4d in the form of a sleeve of aluminum is telescoped only part Way over the projecting end 29 of the insulating rod 26 and that it does not project out of the central bore 18' of the movable arcing terminal 18. Arranged in tandem on the projecting end 29 with the metallic sleeve 40 is a protecting sleeve 41 that is formed preferably of a ceramic material.
  • the protecting sleeve 46 extends into the central bore 18' through the contact tip 18" and also that it telescopes into the counterbore 39 of the tubuar member 27 thereby completely enclosing the projecting end 29 and protecting the same from impingement by the arc 4drawn from the Contact tip 18.
  • the sleeve di like the sleeve 37, prevents the application of the heat of the arc to the end 29 of the stud or rod 26 and also it serves as a gas seal at the upper end of the bore 2S in the trailer 27.
  • a metallic fitting 42 in the form of a plug or insert of aluminum is employed.
  • the metallic fitting 42 has a reduced diameter body portion or shank 43 which is telescoped within a bore 44 at the upper end of a trailer stud 26 which is otherwise similar in construction to the trailer stud 26 previously described.
  • the body portion or shank 43 is secured in place in the bore 44 by a suitable cement.
  • the metallic fitting 42 At its upper end the metallic fitting 42 has a head d5 the diameter of which is the Same as the external diameter of the trailer stud 26.
  • a transverse opening 46 extends through the head 45 for receiving the pin 32 when the trailer assembly is applied to the movable arcing terminal 18.
  • a relatively high strength stud or rod 26 is employed in conjunction with a relatively frangible trailer 27 in the form of a tube telescoped over the former. While the stud or rod 26 is relatively strong, it has little arc extinguishing properties. In contradistinction, the trailer 27, although frangible, has excellent arc excellent arc extinguishing characteristics.
  • a trailer for connection to and movement with a contact of an electric circuit load interrupter device cornprising, in combination, a tubular member formed of insulating material from the surface of which an arc extinguishing medium can be evolved due to the heat of an arc and having the opening therethrough enlarged at one end, and an insulating rod having a head portion at one end interfitting with said enlarged opening at said one end of said tubular member and projecting out of the other end thereof for connection to said contact, said head portion together with the adjacent portion of said tubular member providing a mechanical connection therebetween at the end of said tubular member remote from said contact.
  • a trailer for connection to and movement with a contact of an electric circuit load interrupter device comprising, in combination, a tubular member formed of insulating material from the surface of which an Aarc extinguishing medium can be evolved due to the heat o-f an arc and having the opening therethrough enlarged at one end, an insulating rod having a head portion at one end intertting with said enlarged opening at said one end of said tubular member and projecting out of the other end thereof for connection to said contact, and a resilient gasket surrounding said rod at the base of said head portion and forming a seal between said rod and said tubular member to prevent the iiow therepast of uid products of the arc and providing a shock absorbing cushion therebetween, said head portion together with the adjacent portion of said tubular member providing a mechanical connection therebetween at the end of said tubular member remote from said contact.
  • a trailer for connection to and movement with a contact of an electric circuit load interrupter device comprising, in combination, a tubular member formed of insulating material from the surface of which an arc extinguishing medium can be evolved due to the heat of an arc and having the opening therethrough enlarged at one end, an insulating rod having a head portion at one end intertting with said enlarged opening at said one end of said tubular member and projecting out of the other end thereof for connection to said contact, and a metallic iitting telescoped with said projecting end of said rod for reenforcing the same where it is to be connected to said contact.
  • a trailer for connection to and movement with a contact of an electric circuit loa-d interrupter device comprising, in combination, a tubular member formed of insulating material from the surface of which an are extinguishing medium can be evolved due to the heat of an arc and having the opening therethrough enlarged at one end, an insulating rod having an insulating collar secured thereto at one end to provide a head portion intertitting with said enlarged opening at said one end of said tubular member and extending out of the other end thereof for connection to said contact, an O-ring surrounding said rod at the base of said head portion and forming a seal between said rod and said tubular member to prevent the flow therepast of iiuid products of the arc and providing a shock absorbing cushion therebetween, and a metallic fitting telescoped with said projecting end of said rod for reenforcing the same where it is to be connected to said contact.
  • a trailer for connection to and movement with a contact of an electric circuit load interrupter device Comprising, in combination, a tubular member formed of insulating material from the surface of which an arc extinguishing can be evolved due to the heat of an arc and having the opening therethrough enlarged at one end, an insulating rod having a head portion at one end interitting with and filling said enlarged opening at said one end of said tubular member and loosely fitting within and extending out of the other end thereof for connection to said contact, an O-ring surrounding said rod at the base of said head portion and forming a seal between said rod and said tubular member to prevent the flow therepast of fluid products of the arc, and a metallic fitting telescoped with said projecting end of said rod for reenforcing the same where it is to be connected to said contact.
  • a trailer for connection to and movement with a contact of an electric circuit load interrupter device comprising, in combination, a tubular member formed of insulating material from the surface of which an arc extinguishing medium can be evolved due to the heat of an are and having the opening therethrough enlarged at one end, an insulating rod having a head portion at one end intertting with said enlarged opening at said one end of said tubular member and extending out of the other end thereof for connection to said contact, and a metallic sleeve telescoped over and secured to said projecting end of said rod for reenforcing the same where it is to be connected to said contact and having an opening extending transversely therethrough and through said projecting end to provide for the connection.
  • a trailer for connection to and movement with a contact of an electric circuit load interrupter device comprising, in combination, a tubular member formed of insulating material from the surface of which an arc extinguishing medium can be evolved due to the heat of an arc and having the opening therethrough enlarged at one end, an insulating rod having a head portion at one end intertting with said enlarged opening at said one end of said tubular member and extending out of the other end thereof for connection to said contact, and a metallic plug having a body portion telescoped within and secured to said projecting end of said rod and a head portion provided with a transversely extending opening to provide for connection to said contact.
  • a trailer for connection to and movement with a contact of an electric circuit load interrupter device said contact having a central bore, comprising, in combination, a tubular member formed of insulating material from the surface of which an arc extinguishing medium can be evolved due to the heat of an arc, an insulating rod extending through said tubular member and connected thereto at one end and projecting out of the other end for insertion in said central bore of said contact, and an arc resisting insulating sleeve telescoped over said projecting end of said insulating rod and within said other end of said tubular member and adapted to extend into said central bore of said contact.
  • a trailer for connection to and movement with a contact of an electric circuit load interrupter device said contact having a central bore, comprising, in combination, a tubular member formed of insulating material from the surface of which an arc extinguishing medium can be evolved due to the heat of an arc, an insulating rod extending through said tubular member and connected thereto at one end and projecting out of the other end for insertion in said central bore of said contact, a metallic sleeve telescoped over and secured to said projecting end of said rod for reenforcing the same where it is to be connected in said central bore to said contact and having an opening extending transversely therethrough and through said projecting end to provide for the connection, and an arc resisting insulating sleeve telescoped over said projecting end of said insulating rod and within said other end of said tubular member and adapted to extend into said central bore of said contact.
  • a trailer for connection to and movement with a contact of an electric circuit load interrupter device said contact having a central bore, comprising, in combination, a tubular member formed of insulating material from the surface of which an arc extinguishing medium can be evolved due to the heat of an arc, an insulating rod extending through said tubular member and connected thereto at one end and projecting out of the other end for insertion in said central bore of said contact, a metallic sleeve telescoped over and secured to said projecting end of said rod for reenforcing the same where it is to be connected in said central bore to said contact and having an opening extending transversely therethrough and through said projecting end to provide for the connection, said metallic sleeve extending within said other end of said tubular member, and an arc resisting insulating sleeve telescoped over said metallic sleeve and within said other end of said tubular member and adapted to extend into said central bore of said contact.
  • a trailer for connection to and movement with a contact for an electric circuit load interrupter device said contact having a central bore, comprising, in cornbination, a tubular member formed of insulating material from the surface of which an arc extinguishing medium can be evolved due to the heat of an arc, an insulating rod extending through said tubular member and connected thereto at one end and projecting out of the other end for insertion in said central bore of said contact, a metallic sleeve telescoped over and secured to said projecting end of said rod for reenforcing the same where it is to be connected in said central bore to said contact and having an opening extending transversely therethrough and through said projecting end to provide for the connection, said metallic sleeve extending within said other end of said tubular member, and an arc resisting insulating sleeve telescoped over said metallic sleeve and within said other end of said tubular member and adapted to extend into said central bore of said contact, said one end of said tubular member having
  • a trailer for connection to and movement with a contact of an electric circuit load interrupter device said contact having a central bore, comprising, in combination, a tubular member formed of insulating material from the surface of which an arc extinguishing medium can be evolved due to the heat of an arc, an insulating rod extending through said tubular member and connected thereto at one end and projecting out of the other end for insertion in said central bore of said contact, a metallic sleeve telescoped over and secured to said projecting end of said rod for reenforcing the same where it is to be connected in said central bore to said contact and having an opening extending transversely therethrough and through said projecting end to provide for the connection, said metallic sleeve extending within said other end of said tubular member, and an arc resisting insulating sleeve telescoped over said metallic sleeve in tandem relation to said metallic sleeve and within said other end of said tubular member and adapted to extend into said central bore of said contact.
  • a trailer for connection to and movement with a contact of an electric circuit load interrupter device said contact having a central bore, comprising, in combination, a tubular member formed of insulating material from the surface of which an arc extinguishing medium can be evolved due to the heat of an arc, an insulating rod extending through said tubular member and connected thereto at one end and projecting out of the other end for insertion in said central bore of said contact, a metallic sleeve telescoped over and secured to said projecting end of said rod for reenforcing the same where it is to be connected in said central bore to said contact and having an opening extending transversely therethrough and through said projecting end to provide for the connection, said metallic sleeve extending within said other end of said tubular member, and an arc resisting insulating sleeve telcscoped over said metallic sleeve in tandem relation to said metallic sleeve and within said other end of said tubular memoer and adapted to extend into said central bore of said
  • a trailer for connection to and movement with a contact of an electric circuit load interrupter device said Contact having a central bore, comprising, in combination, a tubular member formed of insulating material from the surface of which an arc extinguishing medium can be evolved due to the heat of an arc, an insulating rod extending through said tubular member and connected thereto at one end and projecting out of the other end for insertion in said central bore of said contact, and sealing means near each end of such tubular member forming seals between it and said rod to prevent the ilow therepast of fiuid products of the arc.
  • a trailer for connection to and movement with a contact of an electric circuit load interrupter device said contact having a central bore, comprising, in combination, a tubular member formed of insulating material from the surface of which an arc extinguishing medium can be evolved due to the heat of an arc, an insulating rod extending through said tubular member and connected thereto at one end and projecting out of the other end for insertion in said central bore of said contact, and an arc resisting, gas evolving and heat resisting insulating sleeve telescoped over said projecting end of said insulating rod and within said other end of said tubular member and adapted to extend into said central bore of said contact.
  • An electric circuit load interrupter device compris ⁇ ing, in combination, separable contacts between which an arc is drawn on opening of the circuit, an insulating sleeve into which one of said contacts is drawn, and a trailer connected to and movable with said one contact into said sleeve and substantially filling the same, said trailer including a tubular member formed of relatively frangible insulating material from the surface of which an arc extinguishing medium can be evolved due to the heat of the arc, and a relatively high strength insulating rod extending into said one contact and through said tubular member and connected thereto at the end remote from said one contact whereby a mechanical connection is maintained with said tubular member in the event that it should become broken intermediate its ends.
  • An electric circuit load interrupter device comprising, in combination, separable contacts between which an arc is drawn on opening of the circuit, an insulating sleeve into which one of said contacts is drawn, and a trailer connected to and movable with said one contact into said sleeve and substantially filling the same, said trailer including a tubular member formed of insulating material from the surface of which an arc extinguishing medium can be evolved due to the heat of the arc, and an insulated rod extending through the principal part of said tubular member and projecting from one end into and connected to said one contact and mechanically connected to said tubular member remote from said one end whereby that principal part of said tubular member between said one end and the connection of said rod to said tubular member is conjointly movable with said rod in the event that the former should become broken intermediate the ends of said principal part.
  • An electric circuit load interrupter device comprising, in combination, separable contacts between which an arc is drawn on opening of the circuit, an insulating sleeve into which one of said contacts is drawn, and a trailer connected to and movable with said one Contact into said sleeve and substantially lling the same, said trailer including a tubular member formed of insulating material from the surface of which an arc extinguishing medium can be evolved due to the heat of the arc, an insulated rod extending through the principal part of said tubular member and projecting from one end into and connected to said one contact and mechanically connected to said tubular member remote from said one end whereby that principal part of said tubular member between said one end and the connection of said rod to said tubular member is conjointly movable with said rod in the event that the former should become broken intermediate the ends of said principal part, and a metallic litting telesco-ped with the projecting portion of said rod and with said one contact for reinforcing said projecting portion.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Circuit Breakers (AREA)
US545044A 1955-11-04 1955-11-04 Circuit interrupter Expired - Lifetime US2816994A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DENDAT1074122D DE1074122B (enrdf_load_stackoverflow) 1955-11-04
US545044A US2816994A (en) 1955-11-04 1955-11-04 Circuit interrupter

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US545044A US2816994A (en) 1955-11-04 1955-11-04 Circuit interrupter

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US2816994A true US2816994A (en) 1957-12-17

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491707A (en) * 1982-09-07 1985-01-01 S&C Electric Company Electrical contact assembly for a current interrupting unit
US4491708A (en) * 1982-09-07 1985-01-01 S&C Electric Company Electrical contact for use in a current interrupting unit
US4562324A (en) * 1982-09-07 1985-12-31 S&C Electric Company Electrical contact for use in a current-interrupting unit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT155939B (de) * 1936-11-10 1939-04-11 Aeg Schaltkammerteil für elektrische Gasschalter.
US2294801A (en) * 1938-05-25 1942-09-01 Westinghouse Electric & Mfg Co Circuit interrupter
US2351826A (en) * 1940-08-02 1944-06-20 Schweitzer & Conrad Inc Switch construction

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE596202C (de) * 1930-12-02 1934-04-28 Siemens Schuckertwerke Akt Ges Selbsttaetige Schalteinrichtung
DE623130C (de) * 1931-10-21 1935-12-13 Siemens Schuckertwerke Akt Ges Einrichtung zum Loeschen elektrischer Lichtboegen, insbesondere fuer Ausblassicherungen
US2082028A (en) * 1932-04-15 1937-06-01 Westinghouse Electric & Mfg Co Plunger-type current interrupter
DE615649C (de) * 1933-04-08 1935-07-10 Siemens Schuckertwerke Akt Ges Schalter oder Sicherung mit Lichtbogenloeschung durch Gase oder Daempfe, die unter Einwirkung des Lichtbogens aus einem festen Stoff entwickelt werden
US2108550A (en) * 1934-03-30 1938-02-15 Westinghouse Electric & Mfg Co Circuit interrupter
DE706064C (de) * 1935-02-23 1941-05-16 Frida Strauss Geb Ruppel Elektrischer Gasschalter
DE705870C (de) * 1935-08-30 1941-05-12 Frida Strauss Geb Ruppel Elektrischer Gasschalter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT155939B (de) * 1936-11-10 1939-04-11 Aeg Schaltkammerteil für elektrische Gasschalter.
US2294801A (en) * 1938-05-25 1942-09-01 Westinghouse Electric & Mfg Co Circuit interrupter
US2351826A (en) * 1940-08-02 1944-06-20 Schweitzer & Conrad Inc Switch construction

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491707A (en) * 1982-09-07 1985-01-01 S&C Electric Company Electrical contact assembly for a current interrupting unit
US4491708A (en) * 1982-09-07 1985-01-01 S&C Electric Company Electrical contact for use in a current interrupting unit
US4562324A (en) * 1982-09-07 1985-12-31 S&C Electric Company Electrical contact for use in a current-interrupting unit

Also Published As

Publication number Publication date
DE1074122B (enrdf_load_stackoverflow) 1960-01-28

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