US2542790A - Circuit interrupter - Google Patents

Circuit interrupter Download PDF

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Publication number
US2542790A
US2542790A US630350A US63035045A US2542790A US 2542790 A US2542790 A US 2542790A US 630350 A US630350 A US 630350A US 63035045 A US63035045 A US 63035045A US 2542790 A US2542790 A US 2542790A
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United States
Prior art keywords
circuit
piston
operating
holding
interrupter
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
US630350A
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English (en)
Inventor
Benjamin P Baker
Mehren Oswald Von
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 US630350A priority Critical patent/US2542790A/en
Priority to GB5980/47A priority patent/GB622162A/en
Priority to CH257854D priority patent/CH257854A/de
Priority to FR988417D priority patent/FR988417A/fr
Application granted granted Critical
Publication of US2542790A publication Critical patent/US2542790A/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
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/32—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator pneumatic

Definitions

  • This invention relates to circuit interrupters in general and more particularly-tooperating mechanisms therefor. More specifically, our invention relates to an improved operating mechanism for a compressed gas circuit "interrupter of the pressurized chamber type.
  • Certain aspects of the invention apply in particular to a circuit interrupter of the gas blast type utilizing a pressurized chamber into which extends a pair of terminal bushings of the type ordinarily'used in oil breakers.
  • gas contained within the pressurized chamber is partly used to obtain high dielectric strength within the region enclosed by the chamber, and is also partly used. to effect the extinction of the are drawn in the pressurized chamber by utilizing a suitable arc extinguishing device in conjunction with the gas blast.
  • the gas blast; uti lized to effect are extinction, passes out of the pressurized chamber through the terminal bushing itself,
  • Another object of our invention is to provide an improved operating mechanism for actuating contact means including an operating rod having secured thereto a piston movable in -an.operating cylinder.
  • Bytheeonstruction which we employ the releasing means has-a relatively short travel as compared to the relatively long travel of-the operating-rod.
  • Another object is to provide an improved .operating mechanismof the type desoribed in the preceding paragraph .in which second holding 2 means are employed to 'efiect holding of the releasing means. Preferably, tripping of the second holding means automatically by an interlockingficonstruction, prevents closing operation of the interrupter.
  • Another object is to provide an improved operating'mechanism suitable tor use in a circuit interrupter inwh-ich interlocking means are providedibetween the-opening and closing'mechanism so that opening takes precedence over the closing operation.
  • We accomplish such a result by utilizing an exhaust valve .associated with the closing valve mechanism which is operated -:by the electric means used to trip the breaker.
  • Another object is .to provide an improved operating' mechanism ,for a circuit interrupter in which the operating mechanism is suppliedwith gas from a pressureeoharnber about the interrupter.
  • Another object isto provide an improved circuit interrupter inwhich only .one air inlet to the-entire interrupter is required.
  • Another object 'is'to' provide an improved high speed mechanism for a circuit interrupter in which h'igh speed opening is obtained because of urrla'tching at the top of the lift ro'd'and in which the moving parts have areladzive'le small mass.
  • Fll1 thr0bCtS relateto :details of construction which will be more apparent hereinafter upon reading the specification taken in conj unction with thedra'wings, in which:
  • Figure 1 shows a side elevational view partly insectionof a-gas blast type or oircuitinterrupter of the pressurized tank construction embodying our inventionand shown in the closed-'cirouitpositi-on';
  • FIG. 2 is an enlarged vertical sectional view through a portion oftheoperating mechanismfor thebreaker shown in Fig. 1;
  • Fig. 3 is a sectionalview taken along the line 1 11 111 0; Fig. ;2
  • Fig. 4" is a sectional view taken along the line IV- IV of and ,Fig. 5 is a diagrammatic view of the electrical control circuit for the interrupter.
  • the reference numeral 1 designates'an enclosure of spheriealshape formingapressurized chamber. .Securedas .by welding'to'the lower end. of the pressurized chamber is-a .pluralityoi, in this instance .four, base supports 2. Extending .from the upperend of the enclosure .1 are -ho1l ow ;terminal bushings 3,, A through which extend respe ively .exhaustpassages .3a, 4a and which support, respectivel at 3 their upper ends line terminals 5, 6.
  • a high pressure gas inlet conduit a leads into tank I from a suitable source, not shown, of high pressure gas.
  • the conducting cross-bar 8 is reciprocally operated in a vertical direction by an insulating operating rod I8 which is preferably guided within a bushing I I, the latter being secured by brackets I2 and bolts I3 to the upper wall M of the enclosure I.
  • an insulating operating rod I8 Positioned on top of the enclosure I is the operating mechanism for the interrupter generally designated by the reference numeral I5 and contained within a metallic housing I6.
  • An operating cylinder II has its lower end welded as at I8 to the wall I4 of the container I.
  • High pressure gas which is present within the region I9 in the interior of the container I communicates with the space 20 (Fig. 2) below the piston 2
  • This use of compressed gas taken from the arc extinguisher enclosure is a distinct advantage in breaker construction since no additional air pipes are required to supply air to the operating mechanism.
  • coupled to the operating rod I0, and movable within the operating cylinder II constitutes a fluid motor generally designated by the reference numeral 22.
  • has an upstanding rod portion 24 having at its upper end integrally formed therewith a latching head 25, the latter being latched or held in the closed circuit position as shown in Fig. 2 by means of two latch pins 26.
  • the two latch pins 26 and the latch head 25 secured to the upper end of the operating rod l0 collectively form a first releasable or holding means generally designated by the reference numeral 21.
  • Each latch pin 28 has pivotally mounted thereon two links 28, as shown more clearly in Fig. 4 of the drawings.
  • the four links 28 have two pins 38 cooperating therewith at their upper ends, the two pins 30 passing through a member 3
  • a rod 32 externally of which is positioned a Sylphon bellows 34.
  • the Sylphon bellows is secured as by soldering at its upper end to a ring 35, the latter being secured as by screws 36 to a cylindrical member 31 having a flange portion 38.
  • the flange portion 38 is preferably secured as by bolts 40 and nuts 4
  • the flange 42 is welded as at 43 to the upper end of a metallic cylinder 44.
  • 2I is provided being threadedly secured at I22 into the lower end of the cylinder 31.
  • has cam surfaces
  • Bumper stops I24 are preferably provided to take the shock during the closing operation.
  • Biasing means are employed to bias the piston 2
  • the rod 32 has its upper end 58 threaded and cooperates with nuts 5
  • the springs 54, 55 are positioned within a housing 55 having at its lower end a flange portion 51 which is maintained in position by the bolts 48 and nuts 4
  • a pin 59 extends through the upper ends of the support plates 58 and pivotally mounts a second releasable or holding means generally designated by the reference numeral 60 and in this instance includin a latched plate BI.
  • is pivotally mounted on the pin 58 and has a notched portion 62 provided adjacent its lower end which serves to latch a hold in the closed-circuit position as shown in Fig. 2 a roller 63 pivotally mounted on a pin 64, the latter in turn extending through two legs 65 preferably integrally formed with the casting plate 53.
  • a latch trigger 66 is pivotally supported on a pin 61, the latter extending through both support plates 58.
  • a tripping electromagnet generally designated by the reference numeral 68 is provided consisting of a solenoid 69 which serves to actuate when ener ized an armature I0, causing the latter to move a push rod II upwardly into engagement with an adjustable stop I2 secured to the right-hand end of the latch trigger 68.
  • a compression spring I3 is provided to bias the latch trigger I56 in a clockwise direction, as viewed in Fig. 2, about the pin 81.
  • the lower end of the compression spring I3 abuts against a portion I4 integrally formed with the housing 56.
  • auxiliary switch generally designated by the reference numeral I8 is employed to actuate control contacts and to indicate the open and closed positions of the mechanism.
  • the auxiliary switch I8 is actuated by a bell crank I9 pivotally mounted on a pin and having two leaf springs 8
  • a pin 83 Positioned between the leaf springs 8
  • a closing electromagnet generally designated by the reference numeral 89 is provided to effect a closing operation of the interrupter.
  • the closing electromagnet 88 when energized actuates a pilot valve 90.
  • the pilot valve 90 controls the flow of high pressure gas from the tank I through a high pressure conduit 9
  • the valve means comprises a valve member 83 aciegveo which is of the double actingtype andccmiirolsv cured to the valve-stem 96"is a pistonSI biased upwardly by a compression spring 98.
  • the compression spring 98 serves to 'bias the valve means 92 to the position shown'in Fig; 2.
  • a nut 99 threadedly secured-to the upper end of the valve stem 96. serves to h'ol'd the ipiston'9l'rigidly in placeto thevalve' stem 96.
  • the valve stem '96 has its upper end bored to guidably' receive a stem 102, the *upper end of which'is securedto a dumpvalve I03 controlling an exhaust" port I'I.
  • Theiupperendofthe dumpvalve I03 is extended to be rigidly connected to a rod I04, the upper end of which is pivotally connected by means of a pin I05 to therighthand end of a lever I06.
  • the lever If06 pivotally rotates about a fixed pivot consisting of a pin I07, the latter passing through-only'one of the support plates 58.
  • An aperture 'I08 is provided in theiatched trigger 66 toaccOmmOdatethe rod I04.
  • Apin III passes through the 'rod I0'4'and is engaged by two bosses I-I2 integrally formed with the latched trigger 66.
  • the bosses IIZ engage the pin I-II passing through the rod I04 to maintain thedump valve I03 open.
  • the casting member 46- Provided 'in the casting member 46- is-a passage-I I5 controlled by the pilot valve 90andcommunicating when the pilot valve 90' is 'open by means of the passage I I8 to thespace' I'I'I above the piston 91.
  • the space I I8 below the pistonfll" is in communication with the atmosphere byway of the exhaust ports H9, a plurality ofwhich are provided.
  • a bleeder opening I25 is provided to permit exhausting of air from the space I'I'T above the pistonS'I.
  • a protective relay I3I having a winding energized by the current flowing'through a winding I32 which is. responsive to'fthe flow ofcurrent passing through the power line 133 controlled by the interrupter.
  • the control. circuit is preferably energized by a source of power which consists of a ne ativev line I34 and a positive line I35 as indicated in Fig. 5.
  • "Back contacts I38 of the auxiliary switch 1.8 control the electrical circuit througha-greenlight I55 which is lighted when the "breaker is in the open position, as shown in Fig. 5.
  • Front contacts I31 of the auxiliary switch 18 control the circuit through a red light I54 which is'lightedwhenthe breaker is in the closed position, not shown in Fig. 5.
  • the front contacts I38. of the protective relays I3I are in shunt with a trip button I39.
  • interlock relay I40 which deenergizes the closing circuit when the opening circuit is energized.
  • the Winding for 'the'interlockrelay I40 extends through front contacts I4I of the auxiliary switch 181..
  • the .interlockrelay I40 has a pair of front contacts I42 which serve to maintaina'shunting;circuit about both the trip button I39 andthe front contacts 1380f thepr0- tective relay I3I.
  • a closing relay I44 is provided which is energized during "the closing operation.
  • the closing relay I44 has a pair of front contacts I45 which arein. series with th'e'windln'g through 'theelectromagnet 89.
  • the closing relay I44 also has-anotherpai'r of front contacts [4H3 whichprovi'de a shunting circuit about the closing button I53.
  • An anti-pump relay I49 is provided having a pair of back contacts I50 which are in series with the winding through'the closing relay I64.
  • The-antipump relay I49 also has a pair of 'front contacts I5I which serve to maintain the winding of the anti-pump relay energized following opening of the front contacts. I52 of the auxiliar switch 78 during the opening operation to prevent pumping. This electrical control feature is well known in the art, and a further description thereof appears unnecessary.
  • Back contacts I43 of the interlock relay -I'40" open to break any circuit through'the electromagnet 89, which provides an electrical interlock feature between the opening'andolosing. circuits, thus giving preference to the opening. circuit.
  • front contacts I42 of the. interlock relay I40 closes to maintain a circuit around the trip button I39 or the front contacts I38 of the protective relay I31, as previousl mentioned. This insures completionof the opening operation.
  • the latch plate 6I when permitted to move counterclockwise releases the roller '53 to thereby permit the compression springs 54", 55, 40 and the acceleratingsprings associated with. the units 1 to force the releasing means I26 and the operating rod I10. downwardly a distance L as indicated in Fig. 2.
  • the pin 54 passing through the indicating lever .84 actuates the auxiliary switch I8 by clockwise rotation of the bell crank'l'S.
  • the downward movement of the releasing means I20 causes thedatc'h pins ZGtospread outwardly by virtue ofthe cam surfaces I23 'to effeet release of the latch head 25. Since the valve means 92 is in the position shown in Fig. 2, high pressure gas exists on both sides of the piston 2! and hence the net downward force exerted by the compression spring 49 will force the piston 2! to move downwardly rapidly a considerable distance within the operating cylinder I? to efiect separation of the contact means disposed within the arc extinguishing units I.
  • the releasing means I26 only has the relatively short travel measured by the distance L.
  • the Sylphon bellows 34 is employed to prevent high pressure gas which is adjacent the first latching means 2'! during the opening operation from escaping to the low pressure region 23 adjacent the casting plate 53.
  • the Sylphon bellows construction is possible because of the limited downward opening travel of the releasing means I26.
  • moves downwardly free of the first latching or holding means 21, having no engagement therewith until the crossbar 8 assumes the position 9, as shown in Fig. 1.
  • front contacts M! of auxiliary switch '58 open to break the energizing circuit through the tripping electromagnet 68.
  • the interrupter is now fully open, all of the circuits being deenergized except the circuit passing through the green light i555.
  • the closing button I 53 is pressed, even though momentarily. This energizes the winding of the closing relay 544.
  • the front contacts I45 of the closing relay I44 close and hence energize electromagnet 89. Also, the
  • the latch head strikes the latch pins 26, the latter being biased toward each other by suitable means not shown, to effect latching or holding engagement of the piston 2! and operating rod I0.
  • the continued upward movement of the piston 2! causes the releasing means I26 to move upwardly the relatively short distance L to force the roller 63 upwardly into the notched portion 62 and hence to effect clockwise rotative latching movement of
  • the compression spring I3 forces the latch trigger 68 into latching engagement with the latch plate 6!, and at the fully closed position of the interrupter, as shown in Fig. 2, the roller 63 strikes the left-hand end 'I'! of the lever I06 to effect opening of the dump valve I03. The parts then assume the position shown in Fig. 2, and the breaker is fully closed.
  • valve member 93 must be insthe position shown in Fig. 2 as soon as possible toiinsure-rapid opening of the piston 21'- and-hence operating-rod I0.
  • releasing means l2 6 1 has only the slight travel: L.
  • a Sylphon bellows constructionwfoesea ing the openinginto theipressurechamber-through which the operatingimechasnism' is controlled is thereforepossible.
  • the construction illustrated not only provides rapid opening and closin'gfoperations'but'ienabl'es the opening operation to: take'iprecedence .struciturally overthe. closing operation; Furthermore, the mechanism ;isadaptableior highaspeed reopening when closing: the interrupter during the existence of short circuit conditions in thefi power line '33;
  • contact means for establishing an-arc operating meansfor thecontact means includinganoperating'rod with-a'relatively long travel first releasable means for holding the operating rod in the closed circuit position disposed in a -regionof high pressure, releasing means for the first releasablemeans having a relatively short travel, and second holding means for holding the releasing means disposed in a regiorrof relatively'low pressure, a Sylphon bellows movable withthe releasing means.
  • contact means for establishing an arc, an operatingrod having a relatively long travel for actuating-the contact means, an operating cylinder, at piston secured to the. operating rod and movable within the operating cylinder, means for admitting 'gas'pressureto said cylinder on both sides of said piston, means biasing the piston in the opening direction, means equalizing pressure on both sides of the piston during the opening operation, first holding means for holding the operating rodin the closed position, releasing means for the first holding means having a relatively short travel, and secondholdingmeans for holding the releasing means.
  • contact means for establishingan arc an operating rodhaving a relatively long travel for actuating the contact means, anoperating'cylinder, a piston secured-t0 the operating rod and movable within the operating cylinder, means foradmitting gas pressure to Said cylinder on both sides of saidpiston, meansbiasing the pistonin the opening direction,
  • first holding means for holding the operating rod in the closed position
  • releasing means for the first holding means having a relatively short travel
  • second holding means for holding the releasing means
  • means providing relatively high pressure adjacent the first holding means during the opening operation
  • means providing relatively low pressure adjacent the second holding means
  • Sylphon bellows means movable withthe releasing means to prevent intercommunciation between the high pressure and low pressure regions.
  • contact means separable to draw an arc
  • a fluid motor including a pressure actuated piston movable axially for actuating the contact means, first holding means for holding said piston in the closed circuit position, means biasing said piston toward the opening direction, releasing means disposed in axial alignment with said piston and movable axially relative to said piston to release the first holding means, means biasing the releasing means in releasing direction, and a second holding means for releasably holding the releasing means.
  • a fluid motor including a pressure actuated axially movable member having a relatively long travel for actuating the contact means, first holding means for releasably holding the member in the closed circuit position, means biasing the member toward the opening direction, releasing means disposed in axial alignment with said member to be moved axially relative to said member and having a relatively short travel to release said first holding means, means biasing the releasing means in releasing direction, and second holding means for releasably holding the releasing means.
  • contact means for establishing an arc
  • operating means for the contact means including an operating rod with a relatively long travel, first releasable means for holding the operating rod in the closed circuit position disposed in a region of high pressure, releasing means for the first releasable means having a relatively short travel, and second holding means for holding the releasing means disposed in a region of relatively low pressure, and means preventing communication between the high and low pressure regions.
  • contact means In a circuit interrupter, contact means, an operating rod in two separable parts for causing the actuation of the contact means, an auto matic disconnect means between the two parts to permit separation of said parts and independent movement of one of the two parts upon movement of the operating rod in the opening direction, restraining means normally restraining said automatic disconnect means, and electroresponsive means operable to effect release of said automatic disconnect means.
  • a pressure chamher In a circuit interrupter, a pressure chamher, contact means within the pressure chamber, an operating means in two releasable parts for causing the actuation of the contact means, a releasable connection between the two parts within the pressure chamber, and means for effecting the release of the releasable connection to permit independent movement of one of the two parts upon movement of the operating means in the opening direction.
  • contact means In a circuit interrupter, contact means,
  • an operating means in two separable parts for causing the actuation of the contact means, a releasable connection between the two separable parts, a piston connected to the operating means between the contact means and the releasable connection, and means for effecting the release of the releasable connection to permit separation of said parts and independent movement the part connected to the contact means upon movement of the other part in the opening direction.
  • a pressure chamber In a circuit interrupter, a pressure chamber, contact means within the pressure chamber, an operating means in two releasable parts and extending into the pressure chamber for causing the actuation of the contact means, a releasable connection between the two parts within the pressure chamber, means for eifecting the release of the releasable connection to permit independent movement of the part within the pressure chamber upon movement of the part of the operating means outside of the pressure chamber in the opening direction, and a piston within the pressure chamber and secured to the part which moves independently in the opening operation.
  • contact means In a circuit interrupter, contact means, an operating means in two separable parts for causing the actuation of the contact means, a releasable connection between the two parts, means effecting the release of the releasable connection during the initial portion of the opening operation to permit separation of said parts and independent movement of the contact actuating part in the opening direction, holding means for the operating means, and the re-engaging movement of the independently movable part moving the other part during the closing operation to position where it is held by the holding means.
  • a circuit interrupter including separable contact means, operating means for said contact means including anoperating rod having a relatively long axial travel to open and close said contact means, a first holding means for releasably holding said operating rod in closed position, releasing means disposed in axial alignment with said operating rod and having a relatively short axial travel relative to said operating rod to actuate said first holding means to thereby release said operating rod, a second holding means for releasably holding said releasing means and operable to effect release of said releasing means, spring means biasing said releasing means in releasing direction and operable upon operation of said second holding means to actuate said releasing means, and an operating piston disposed between said contact means and said first holding means.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Circuit Breakers (AREA)
US630350A 1945-11-23 1945-11-23 Circuit interrupter Expired - Lifetime US2542790A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US630350A US2542790A (en) 1945-11-23 1945-11-23 Circuit interrupter
GB5980/47A GB622162A (en) 1945-11-23 1947-03-03 Improvements in or relating to electric circuit interrupters
CH257854D CH257854A (de) 1945-11-23 1947-03-08 Mechanismus zum Betätigen eines Schalters.
FR988417D FR988417A (fr) 1945-11-23 1947-04-30 Disjoncteurs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US630350A US2542790A (en) 1945-11-23 1945-11-23 Circuit interrupter

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Publication Number Publication Date
US2542790A true US2542790A (en) 1951-02-20

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US630350A Expired - Lifetime US2542790A (en) 1945-11-23 1945-11-23 Circuit interrupter

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US (1) US2542790A (de)
CH (1) CH257854A (de)
FR (1) FR988417A (de)
GB (1) GB622162A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166326B (de) * 1954-12-24 1964-03-26 Westinghouse Electric Corp Elektrischer Schalter

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2015633A (en) * 1933-07-12 1935-09-24 Westinghouse Electric & Mfg Co Circuit breaker
US2153400A (en) * 1936-12-14 1939-04-04 Gen Electric Electrical switch gear
US2281337A (en) * 1937-04-03 1942-04-28 Gen Electric Circuit breaker fluid pressure operated system
US2286023A (en) * 1940-07-11 1942-06-09 Gen Electric Pneumatic operating mechanism for circuit breakers
US2290320A (en) * 1937-11-10 1942-07-21 Westinghouse Electric & Mfg Co Circuit breaker mechanism
US2292096A (en) * 1940-02-06 1942-08-04 Gen Electric Circuit-breaker operating system
US2360687A (en) * 1942-07-29 1944-10-17 Westinghouse Electric & Mfg Co Circuit interrupter
US2408199A (en) * 1941-09-13 1946-09-24 Westinghouse Electric Corp Circuit breaker
US2425168A (en) * 1943-08-06 1947-08-05 Westinghouse Electric Corp Automatic and manual reclosing control circuits for polyphase single pole circuit breakers
US2447656A (en) * 1944-05-24 1948-08-24 Westinghouse Electric Corp Compressed gas-operated circuit interrupter with position indicator

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2015633A (en) * 1933-07-12 1935-09-24 Westinghouse Electric & Mfg Co Circuit breaker
US2153400A (en) * 1936-12-14 1939-04-04 Gen Electric Electrical switch gear
US2281337A (en) * 1937-04-03 1942-04-28 Gen Electric Circuit breaker fluid pressure operated system
US2290320A (en) * 1937-11-10 1942-07-21 Westinghouse Electric & Mfg Co Circuit breaker mechanism
US2292096A (en) * 1940-02-06 1942-08-04 Gen Electric Circuit-breaker operating system
US2286023A (en) * 1940-07-11 1942-06-09 Gen Electric Pneumatic operating mechanism for circuit breakers
US2408199A (en) * 1941-09-13 1946-09-24 Westinghouse Electric Corp Circuit breaker
US2360687A (en) * 1942-07-29 1944-10-17 Westinghouse Electric & Mfg Co Circuit interrupter
US2425168A (en) * 1943-08-06 1947-08-05 Westinghouse Electric Corp Automatic and manual reclosing control circuits for polyphase single pole circuit breakers
US2447656A (en) * 1944-05-24 1948-08-24 Westinghouse Electric Corp Compressed gas-operated circuit interrupter with position indicator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166326B (de) * 1954-12-24 1964-03-26 Westinghouse Electric Corp Elektrischer Schalter

Also Published As

Publication number Publication date
FR988417A (fr) 1951-08-27
CH257854A (de) 1948-10-31
GB622162A (en) 1949-04-27

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