claim as my invention: 1. A circuit interrupter comprising, a plurality of pairs of separable contacts, solenoid means individual to each pair of contacts for effecting separation of the contacts in response to a predetermined value of current, normally inactive lockout means operable to bias all of said cgntacts open, a coun'ler individual to each solenoid means operable to activate the lockout means, electromagnetic means operable to render the lockout means inactive, reclosing means operable with different intervals of delay to sequentially render the electromagnetic means operable, and switch means oper,,ible by operation of the lockout means to render the reclosing means operative for a predetermined number of closely successive operations. 2. In a circuit interrupter, a plurality of pairs of individually separable cont-,tcts, series scleiioid n-ic@,.ns individual to each p-,iir of contacts provicl-ing the energy for separating said pair of coiitacts in response to an overcurrelit througii said pair of coiitacts, lockout iiieans biased to separate all of said contacts, 1,,itch mcaiis normally renderiiig tic lockout means iliactive, q. counter individual to each pair of contacts op,,- rable to release said latch means on the first operation, clectro.,iiagnetic means operable to reset the latch means and render the lockotit means operative, and seqii,nce switch means sequentially effecting operation of the electromagnetic means a predetermined number of times. 3. A circuit interrupter comprisin-, a plurality of paii. s of separable contacts, electroresponsive means individual to each pair of contacts for separating said pair of coitacts including a solenoid connected in circuit with said contacts and an armature actuated in response to an 10 overcurrent through the solenoid to separate said pair of contacts, lockout means common to all pairs of contacts including a single member biased to lock all of said pairs of contacts open, a toggle I-,itch normally rendering the lockout means ineffective, a counter member individual to each pair of contacts advanced in response to a predetermined number of operations of its contacts to effect release of the to,-gle latch on the first operation, electroma.-netic means operable to res-,t the 10 toggle latch, and reclosing means activated by operation of the electromagnetic means to effect operation thereof after different intervals of delay. 4. In a recloser, a plurality of pairs of separable contacts, means biasing said cgntacts closed, series solenoid 15 means connected in series with each of said pairs of cortacts each having an armature operable to @eparate a pair of sa;d contacts against the force of the biasing means, lock-out means biasin.- all of said contacts open, latch means norniauy set to prevent operation of the 20 lockout means, a counter individual to each armature advanced in response to any one operation of said armature to releasp, said latch means, electroma,@netic means operable to reset said latch ineans Elnd close all of said contacts, a seqtience relay operable to effect a s.,qlience 25 of operations of the electromagnetic means, and a switch actuated by the lockout means to render the sequence, relay effective. 5. A polyphase eircu;t interrupter compris-ing, a pair of separable contacts for eacii phase of a polyphase cir30 cuit, electroresponsive means individual to each pair of contacts having an armature movable to effect separation of its pair of contacts, a common lockout member for locking all pairs of contacts open, means normally biasing the lockout means to lock said contacts open, a 35 single latch normally set to prevent movement of the lockout member, a counter individual to each pair of contacts advanced by operations of the armature to release the latch on the first operation, electron-iagnetic means operable to reset the latch and relider the lockout 40 member ineffective, means including a. cam seqiience switch setting up an energizing circuit for t'ne electromagnetic means at differently spaced intervals, and an auxiliary switch actuated by the electromagnetic means 45 connected to complete said circuit. 6. A polyphase recIGser coinprising, a pILirality of pairs of separable contacts, series electroresponsive means individual to each pair of contacts operable to separate theni in response to a predeterniined value ofcurrent, 50 biasing means biasing said contacts to reclose following a separation, loCKoLit meaiis iiieludin.- a common lockout men-iber nornially biased to separa:Le all pairs of coiitacts, a toggle latcli normally makiiig the lockout niember ineffective, means individu,,tl to each pair erf 55 c!ontacts operated by each operation of the electroresponsive -nleans to release said latch, electromagnetic means operable to reset said toggle latch and render the lockout means ineffective, and inotor operated reclosin.- means operable to effect operation of the electron-iagnetic means 60 a predetermined niiniber of times in response to such separation of said contacts. References Cited in the file of this patent UNITED STATES PATENTS 65 2,567,411 Van Ryan ------------ Sept. 11, 1951 2,593,225 Van Ryan et al - -------- Apr. 15, 1952

Uti" d States Patent Office 2179@2,530 ite Patented May 14, 1957 2 throug h openin.-s in cover flange 8, to have nuts 10 the reon for drawing the cover down tight on the iipper ed ge of the tank. 2,792,530 The circuit interrupting device illustrited is substanTHREE-PHASE CIRCUIT RECLOSERS 5 tiall y identical with that ol. copelidin.- ,ipplication Serial No . 184,482 of Andrew W. Edwards et al., erititled "CirJames M. Wallace, Montclair, N. J., assignor to WesVk)lgcuit Interrupter Or)eratip..- Mechanism," filed o-,i Sephouse Electric Corporation, East Pittsburgh, Pa., a cc?rtembe r 12, 1950, an-d assigned to the assi-nee of the presporation of Pennsylvania ent i.lvention, now Patent No. 2,7z@8,221, and is shown Application May 25, 1953, Serial No. 357,113 10 as having three poles, with the cover liavin.- three spaced pai rs of bushing supports 12 on which lead-in bushings 6 Claims. (Cl. 317-22) for line conductors m-@y be mounted. A switch i-init 1-t is provided for each pole, each of the switchin.- units 14 bei n.- cknabl,- of automatically openin.- and closiii.- the My invention relates generally to circuit interrupters 15 cir cuit. Each of thes.- automatic reclosin.- units 14 is and it has reference in particiilar to interrupters of the suppo rted from cover 4 by supportin.- rods 16 which automatic reclosing type. a re directly secured to a castin,@ 20 at their lower ends. Generally stated it is an object of my invention to proAdditi onal supporting rods 22 are for the purnose of vide in a simple and inexpensiv-. manner for applyin.- suppo rting a series operat;ng coil 23 betv@e,-n casting 20 self-contained automatic reclos,-rs in a polyphase system 20 a nd a supporting plate 24 spaced beneath the castinso that reliable protection will be afforded against sin@- le ,ind still further supporting rods 26 are for the purpose line to ground faults. o f supporting at their lower ends the top cap 28 of an More specifically it is an object of my in-venlion to arc chamber 30 from supporting plate 24. The supportprovide for effecting lockout of all three poles of a reting rods are as shown in Fig. 3, preferably of an insucloser in response to an opening of any one pole, and 25 l ating material. Arc chamber 30 includes a tube of i-@ifor using a reclosing relay for obtaining a pred-- @,ermined s ulat;ng material, such as fiber, threaded into top cap 28, number of reclosings before locking the recloser open. Another obj,-ct of my invention is to provide l'or simultaneously opening all three poles of a three pole recloser in response to a single line to ground fault, to 30 prevent feedback throigh the ungrounded phases. Yet another object of my invention is to provide for adapting a relatively inexpensive recloser for groiind fault protection iii a polyphase system. It is also an object of my invention to provide for ad35 justing the counter of a three-phase recloser to obtain lockout in response to a sipgle operation of any one pole, and for using a sequence relay to obtain a limited number of reclosings in response to lockout. In practicing my invention is accordance with one of 40 its embodiments the counters of a polyphase recloser having series solenoids individual to each pole for opening them, and a counter individu-,d ' o each pole for oderating a common lockout mechanism to lock all poles open, are adjusted to effect lockout in response to a sin.- le 45 operation of any Qne pole. A predetermined seqtience of reclosili-s is obtained before effecting lockout by usi a seqtiencing relay to seqiientially effect reclosin- of the recloser for a predetermined number of times. For a more complete understanding of the natlire and 50 scope of my invention, reference may be made to the following detailed description, which may be read in connection with the accompanying drawin-s in which: Figure I is a side elevation view, partly b'roken avay, illustrating a three-pole power-operated circuitinter- 55 rupting device constructed in accordance with one embodiment of this invention; Fig. 2 is an enlarged side elevation view of the power operating mechanism shown in Fig. 1, with the cover removed and certain of the parts broken anvay and illus- 60 trated in section; Fig. 3 is a transverse section of the interupter show@i in Fig. 1 illustrating one of the automatic reclosinunits, and taken substantially on the line 111-111 of Fi-. 1; ard Fig. 4 is a diagrammatic view of a polyphase automatic 65 reclosing apparatus embodying the interrupter device of Fig. 1. The circuit interrupting device 3 shown in Fig. 1 is mounted in a metal tank 2 having an open top adapted to be closed by a hollow cover casting 4, which may be 70 secured to the tank in any desired manner, for example as by bolts 6 secured to the tank and adapted to extend and having a bottom cap 31 threaded on the low-,r end thereof. A stationary contact screw 32 is threaded iilto a center openin.- provided in bottom cap 31 of the are ciiamber, and it is adapted to be enga-ed within the chamber by the lower end of a movable contact rod 33 having a liquid directing structur.- 34 slidably mounted thereon within the arc chamber. Liquid directing structure 34 has lost motioii relalive to the contact and is biased downwardly by a spring -5 and further includes a check valve ring 36 providing for fr.-er movement of the movable contact rod and liquid directing structure downwardly than in an upward direction, and the are chamber itself is provided with an outlet valve ri-@ig 38 spring biased to normally uncover outlet passage 39 in the top cap 28, and an inlet check valve ring 40 controlling inlet openiii.-s in bottom cap 31. A tubular gas shield 42 of insulatin@- mate@rial, such as fiber, is supported between toD cap 28 of the are chamber and supportinplat.- 24 for @he bottom of series coil 23, being secured to plate 24, to prevent gases escaping from outlet 39 of the arc chamber from -ainiiig a.,cess to the central Dart of the casiti.- i,-i the vicinity of contact rod 33. A tubular solenoid core 43 is slidably motinted within series coil 23 and telescopically on contact rod 33, with an actualin.- ttibe 44 projecting tipwardly therefrom to have an actuatiii@ washer 45 secured thereon at the top of casting 20, and bein- engageable with an integral shoulder 47 provided.on the tipper part 33' of contact rod 33. A coil compression spring 48 isinterposm between solenoicj core 43 and a shoiilder adjacent the lower end of tne upper portioii 33' of contact Tod '--3 to be compressed as the core is attracted upwardly by coil 23. li order to count th-- Pt,.mber of closely successive interrupti@@ig operat-lons of the interrtipting device, an actiiating lcver 49 is pivotally mounted on castin,- 20 as at 50, with its outer end @-estin@ on aettiatiii,@ washer 45, for advancing a counting piston 52 molinted in a vertical coiintin- cyliiider 1-@3 having a liquid inlet i-n @he, bottom thereof ccntrolled by a check valve 54, by nicans of a pawl portion 56 on the actliatinlever which is en-@@.geable with ratchet teeth or flanges 57 formed on a rod o8 which extends -upwardly from piston 52. At the upper end of piston rod 58, there is Drovided an operatin.- rod 60 for a purpose to be described. The -upper portion 33' of contact rod 33 of each operating unit is pivoted to P. pair of connecting links 62 which,

2,792,530 3 in tirn, are pivote d on a common pivot 63 to adjacent e,@--ds of t cliannel-shaped liilk 64, azid a l@ink 65 which has a hook Poltior-, 67 extending through aa op-,nin,@ in the chati-tieled li k 64. The other end of channeled link 6, is pivoted in --oivot depressions formed ii-i the lower end of a 5 pivot stipporting bracket 68 secured to a luinteotal with tank cover 4, and the two linl@s 64 and 65 are held at tic pos,tion sho.@vii by a cciled t,-rision spripg 69 engaged between a ILig integral with tank cover 4 and Iiiik 65, to thiis not only mn-intain the links in the position sliown @'n Fi2. 3, 10 but also to exert substantial pressure on the coptacts at the closed circuit position. In operation, each ai-itomatic reclosing unit 14 b@- ing structurally substantially identical ivith the unit disclosed in the copending appl,'c,,ition of J ' M. Wallace et al., Serial 1.5 No. 162,174, entitled "Titne Delayed Circ,,iit Breakers," filed May 16, 1950, and assigned to the same assignee as this invention, no-.,v Pate-nt No. 2,647,184, -@vill operate in substantially the saine marner as the u@-iits in such copendin,- application. Accordingly, for a mo.-e complete 20 description of the i)arts of each u,2it 14 and the mode of o-,oeratio-ii, reference ;s hereby made to the aforesa;d copending application. In general, ol)erating coils 23 being conr@ected in series in the respective phase conductors by a conductor (ncit 25 shoivii) leadin- to one of the bushings on co-,,er 4 and conductor 70 connecting each coil to its contact rod 33, and thence by a conductor 71 to the other bushing mour@ted oTi tank cover 4, each coil will operate to attract its solenoid core 43 on overcurrents i-q its circ-Liit codductor, and aft--r 30 compressin.- spring 48 during uoward - movem-ent, the co-e will eventually cause fhe washer 45 at the ut)per end of its tube 44 to enaaize shoulder 47 o-i the co-.-itact rod to sei)arate the movable contact from stat;onarv co.,itact screw 5 32, a,,id thus draw an are in are chamber 30. The arc 3 thus drawn will be acted on by liquid directed th@- ough the are by the liqliid direct;n,@ -structure 34 which is picked ui) by the movable contact rod in its tioward movement T'he t)ressurf-- existing withirl- the arc chamber durinarc' ing operates to seal off the inlet and outlet valve,- 40 and 40 38, rest)ectively, and also acts to accelerate openin@ movement of the contact rod. Likewise upward movl_ ment of actuating sleeve 44 operates lever 49 and pawl 56 to advance countin!z piston 52 a predeterriipcd amotint. As soon as the are wi@Iiin are chamber 30 is extinpiiished, 45 the movp-ble contact rod ;s free to return, due to the fcrce of gravity, and possibly some force due to spring 69, to thus automatically reclose the circii-.t through each unit in doing so, the arc cha-rnber 30 may be -flushed out @v ,gases escal3ing throuph the top cap 28 being repiaced 50 bv fresh liciuid e-nterin- the inlet openin-s iri the b(,ttom cap 31. In the usual arrarigement of automatic cireiiit oo,-jii,,Ig and closinl- oi)erations such as described above, each unit 14 is operabl,- i@-ideDendeit@ly of the other, so that if the 55 overload occurs oTi on'y one phase. oiilv fne unit 14 located in that phase conductor will oT)'eratc,'w;th the otber units remaining closed. As sholvn in Figs. I atid 3, a gener,,ally U-shaped b@racket 73 has its le, Dortions pivotally moiinted at 75 60 op the leg portions of an i-Tilierted U-shaped supportinbracket 7-4 ha-%,i@),- the bight portion oj' the latter secured to an into-ral siipporting le@ in cov-,r 4 for tank 2, there being such brackets for each of the auto-rnatic r@- closin@ units 14, with the biehl 7)ort,on of each brac.Icet 73 bein@@ 65 posi*io.ned bepeath Iiiiks 64 and 65 connected to the upper end of the contact rod 33 of the @resp,-ctive units. One 'leg of each bracket 73 has pivotally connected therewith as at 82, a conn,-ctin,- rod 76 @vhich is common to all of the units. haviig t!ie bracket 73 of each unit Divotall@, 70 connected thereto. Conpectin@ rod 76 is biase@ to the left as viewed in Fig. I in a direction to rotate br,-..ckets 73 counterclockwise to bring thei.r bight portio-Tis @into engagement with tleir respective links 65 to raise the co@itact rods 33 and hold them at an open eireliit position, by a coil 75 4 tension SPririg 77, having oile end secured to a lug 78 integral with coier 4, andhaving the other end secured to a.-i angled end 79 of connecting rod 76. However, conn,-ctingrod 76 is nor-tnally loelced against movement by aii operaling mechanism 80, since the inner end of the conre,-ting,rod is pivotally connected to a toggle link 81 thereof as at the pivot point '2. Also common to all of the automatic reclosin.- units 14 is a trip shaft 83 which extends ir. pro,-,imity to the Lipper el2cis of all of the units, be;ng r@-tatably supported at its itiner end i@i a bearidg bracket 84 susp,-nded from the cover 4, ar,.d at its outer end in a beariiig br-.cket 84' also stipported from 'Lhe cover. Trip shaft 83 is provided with a pltirality of radiallv exteiiding cra-ii'-s 85, there being c.-ic f--r each auto-Tnatic reclosin.- unit 14, a@ad an additional oiie located wiihip a conta@'iier 1,11 for the operat;ng meci-iaiism, f--r a reaso@i which will be hereinafter exolained. T-4c hollow co@,,er 4 for tank 2 has aii iitegral extension .1,2 at one eiid ,vhich extends oi-itwardly beyond that end of the tank- a@ld has therein iiitegral supportii-,g '@ugs 93 for supporting a plate 94 aL a Dos-'@tion spaced benealh the cover, as by one or more oderating mechanism supports 95. The operalin@ mechanis-,n as shown partly in Fig. I apd principa.'Iy iii Fig. 2 includes a to,-gle linkage mounted on ton of stipporting pla,Le 94 comprisiiig the toggle link 81 wtiich is connected to the pivot o2 for the adjacent switch unit 14 at one end, and at its other end is con@iected 'to a second tog-Jo lidk 96 ivhich is of inverted U-shape at t@ic end adjacent to link 81, to form one overeenter pivot 97. I-oggle link 96 has a bight portion 108 ov--rlying the adjacent end of link 81 to limit relative mover@-lent of overcenter -nivot 97 downwardly. A third toggle lever 99 also of U-shape has the legs thereof adjacent bight portion 100 mounted on a stationary pivot 101 on a stationary sii, Dporting bracket 102 also of substantial U-shape with its bi.-ht portion secured to the upper side of mechanism supportin@ plate 94. Toggle 0 lever 99 is co@ntiected to link 96 by an overcenter pivot 103, so that the to,-gle I;iikage includes the two overcenter pivots 97 and 103. Overcenter pivot 97 of the toggle linkage is adapted to be held against movement at the closed circuit position of :the interruptin- device by means of a toggle latch linl,- - ,04 pivoted on the same axis as overeenter pivot 97 at one end, and at its other end having an overcenter latch pivot 105 with a second to,@gle latch lirk 106, which, in turn, is stationarily pivoted at 107 between the le-s of bracket 102. It wiU be observed that at the closed circuit position of the parts illustrated in Figs. I and 2, overcenter pivot 97 is slightly aboy.- the center line between toggle pivots 103 and 32, so that spring 77 tends to break this toggle upwardly, but this is preventpd by a latch lever 103 having a latch shoulder 109 engaging a roller 110 i)rovided on overcenter latch pivot 105 which prevents t]@is Divot from moving to the left as viewed in r-ig. 2, and consequently holds oliercenter pivot 97 of the overcenter linkage from breaking uvwardly. Latch lever 108 is mounted on a stat-lonary pivot III at one end outside of bracket 102 with an inwardly directed part extending through an openin112 in one side of bracket 102 to stinport shoulder 109 inside th.- bracket, and having at the onposite end a latera'ly extend@'ng portio@l 113, for a purpose to be described. Referrin- to Fig. 4 of the drawings, it will be observed that extension 1-13 of latch lever 108 overlies one leg of a latch rel,-ase bell crank 114 Divotally mounted on a supportinfrar.,ae 115 at 116. The other end of latch release bell crank 114 is received in an annular groove provided in the outer end of the core 117 of a trip coil 118, which is mounted withiii supporling fram.- 115 of inverted U-form, and secured to mechanism supporting plate 94, as by the bolts 120 -A laminated plate 122 of magnetic material, such as soft iron, is supported at'a point spaced beneath mechanisrn supporting plate 94 by a pair of channel-shaped

5 supporting plates 124, which may also be of magnetio material with the cliannet pla'Les being secured to mechanism supporting plate 94 as 1,@,y bolts 126, and supporting magnetic plate 122 as by bolts 128. Magnetic plate 122 is provided with a central opening 130, which lines up with the central opening in a closing coil 134 motinted in cutout parts of char,.nel supporting plates 124 and laminations 125 t'@ierebetween, with the former openings adapted to receive an armature 136 for closing coil 134, and the an-.iature has an operating rod 138 projectiii., frorn the upper end thereof. Armature op,-rating rod 138 has an inte,-ral stop flalige 140 thereon positioned above mechanism supportin.- plate 94 and at its upper end is pivoted as on pivot pin 142 to toggle lever 99. It will now be observed that in the closed position of the circuit interrupting device shown on the drawin-s, both overcenter pivot 97 and 103 of the toggle linkage are held at positiops slightly above their central positions so that contact opening spring 77 tends to break both of these toggles upwardly, and both are held a-.ainst such movement, with overcenter pivot 97 being held by latch 108 and overcenter pivot 103 being held against ftirther upward movement by engagement of armature 136 6f the closing coil with a stop formed by central dependin.portions of coil supporting channel plates 124 and the laminations 125 therebetween. Opening of the contacts can be accomplished from a remote location by causing energization of trip coil 118, which will attract its armature 117 inwardly to rotate latch release lever 114 in a countereloclwise direction (Fig. 4) to thus rotate latch release lever 108 clockwise (Figs. 2 and 4), to release overeenter latch pivot 105 and permit the linka,--to move from the position shown in Figs. I and 4 to that wliere overcenter pivot 97 breaks upwardly. After this has occurred, the biasin.- force of gravity on core 136 of the closin.- solenoid moves if and toggle link 96 downnvardly, and the parts ultimately reach a posit;on where overcenter latch pivot 105 will again be latc@ed by latch lever 108. The linkage now is in condition for closing the contacts of trte circuit interrupting device from a remote point by causing energization of closing coil 134, which attracts its armature 136 upwardly forcing counterclockwise rotation of toggle link 99 to thus restore the linkage to the position shown in Figs. 2, 3 and 4 with the contacts of the circuit interrupting device closed. For the purpose of energizing closing coil 134, there is provided a relay 144 which is mounted beneath the closing solenoid 134. Relay 144 is, as shown in Fig. 4, provided with two sets of spaced stationary contacts 145 and 146. These stationary contacts 145 and 146 are adapted to cooperate with movable contacts 147 and 148 mounted on one end of a contact lever 156, also preferably ol. a molded insulating material, carrying at the other end thereof a transverse actuating pin 158. In closing the relay contacts, the actuating pin 158 of the contact lever is adapted to be engaged by the shotilder 160 on an operating link 162 which is pivotally mounted at 163 in the lower end of an armature 164 for relay coil 165. Operatin.- link 162 of the relay may be normally biased ;n a clockwise direction, as viewed in Fig. 4 to cause engagement of its shoulder 160 with actuating pin 158 of @the contact lever 156, by a suitable sprin,@ (not shown). Movable contact lever 156 is biased for movement to disengage movable contacts 147 and 148 from stationary contacts 145 and 146. For the purpos-I of releasing operating link 162 from acttiating pin 158 of the contact lever, there is secured to the lower e-nd of arr@iature 136 of the closing coil 134, ari angularly shaped extension 166 having an outer end which extencts into proxiraity with an an-ular extension 167 on operating link 162 to move its shoulder 160 out from beneath actuating pin 158 on the contact lever, to thus mechanically disconnect the relay armature 164 and movable contact 2,792,530 6 core 136 attains its ii,)permost or closed circuit position, so that t he relay contacts are then permi'Lted to be opened, and shoulder 160 is preven'ed from reengaging pin 158, irrespective of whether or not relay coil 134 is then eiiergized. At the position of the parts of the relay shown in Fig. 4 of the drawings, extension 166 of the core 136 of the closing solenoid has engaged extension 167 of link 162 to remwve sho-older 160 from beneath actuating pin 10 158 on the contact lever 156, and the relay contacts liave opened. 'vvith the relay contacts open, closing coil 134 and relay coil 165 are then both deenergized, and armature 164 of the closing relay is prevented by extension 166 from descending under the influence of 15 gravity. If trip coil 118 is energized, toggle latch lever 104 is released permitting lever 99 to rotate clockwise and armature 134 to drop. This removes extension 166 from interfering with extension 167 of link 162, thus 20 permitting operating link 162 to rotate in a clockwise direction where it will be in a position to reengage actt,.ating pin 158 of the relay contact lever, as soon as arn-iature 164 of the relay coil descends a sufficient distance. Upon rectiergization of relay coil 165, as by 25 closing switch 207 or otherwise, its armature will be drawn upwardly and the operating link will carry actuating pin 158 upwardly to close the relay contacts. Then closing coil 134 will be reenergized through contacts 146 and 148 and its armattire 136 will be moved upwardly -3 0 to close the contacts of the interrupting device as previously explained, and ultimately cause operating link 162 to be moved out from under actuating pin 158, thus mechanically releasing the relay contacts for opening movement when th.- closing solenoid has completed @,5 its travel and the contacts of the interrupting device are closed. At the left as viewed in Fig. 2, n-iechanism supporting plate 94 has an integral extension on which is mounted a lin3it switch 170. T'@iis switch has an operating shaft 40 171 provided with an operating crank 172 at the outer end of Nvhich is pivotally connected at 174, a link 175 cornected at its other end to the adjacent bracket 73 as by pivot 176. Limit switch 170 includes a plurality of sets of stationary contacts spaced along the length thereof 45 and adapted to cooperate with bridging contacts to connect the circuit between each set of stationary contacts depeildent upon the position of the contacts of the circuit interrupting device. Each of the stationary contacts of the limit switch has a terminal at the exterior ,-)O for connection of the various circuits theteto including indicator light circuits, for indication of the condition of the circuit interruptiiig device at a remote location. A supporting bracket 178 is secured to the lower side of magnetic plate 122 of the operating mechanism as by ,-)5 bolts 128 and it, in turi, supports a terminal block 180 of insulating material, such as porcelain, having a plurality of terminal scre@vs thereon to which the various connections to the electrically energizable components of the operating mechanisrii may be made. The support C)O 178 for the terminal block also is provided with a screw threaded stud 182 proj;ecting downwardly to be received in an opening in the bottom wall of casing 91 for the operatiig mechanism and then have a nut 183 threaded thlreon to hold the casing 91 in a position where it re65 ceives the operatin-. ii-iechqnism and forms a substantially complete enclosure there' or with cover 4 for tank 2. In order to manually operate the circuit interrupting 70 d-.vice, an oper-,Atiiig sh,,ift 186 is journalled in the bracket 102 on mechanisni support'ing plate 94 and it has a radially projecting pin 187 slidably received in an opening provided in pivot pin 142 of toggle link 99. Operating shaft 186 extends beyond the operating mechanism to lever 156 from operating link 162 when the solenoid 75 have an operating handle 188 secured thereon which is

normally @positioned (Fig. 1) beneath an offset hood portion 92 provided integral with one side of tank cover 4, and -having. @L notch 190 therein through which the outer end of tl,.e handle is accessible for operation, as by a hook-stick operatin.- member or the like. A lever 189 is provided on shaft 186 to be engaged by radial rod 85 beneath the extension 92 of the cover for tripping the interrupters and locking them open in response to predetermined movement of counter rods 60. Assuming the par-ts of the operating mechanism and circuit interrupting device t6 be at the closed circuit position illusirated, it will be apparent that by @pulling downwardly on handle 188, the operating shaft 186 will be rotated in a direction such that its operating pin 187 causes toggle link 99 to move downwardly, thus moving overcenter pivot 103 downwardly and over its center to the position @vhere the toggle linkage is broken' and at which position the circuit interrupting device i, held at open circuit position by spring 77 mounted in c6ver 4. At this time, handle 188 will project beneath cover hood 92, and it will be apparent that by moving this back up to the position shown in Fig. I toggle link 99 will be moved back, upwardly to move overeenter pivot 103 upwardly overcenter to the position shown in Figs. 2 and 4 where it is held byengagement of core 136 of the closing coil with shoulders formed on channel sul)porting plates 124, with the contacts of the circu'i@t interruptin-. device thus being held at their closed circuit position. As previously described, the countin.- piston 52 of each automatic reclosing unit 14 in a recloser of the usual type may, on srista ed overload in that particular phase of the circuit, be Pdvqnced upwardly -LintiI afte,l a predetermined number of closely successive operations the operating extension 60 thereof engages the radial crank 85 on the Lrip shaft 83 located immediately ther.-above, to rotate the trip shaft and thus cause the inner radial crank 85 to rotate operating shaft 186 in a direction to move toggle lever 99 downwardly and overcenter Pivot . 103 downwardly overcenter, to thus release tension spring 77 to move connecting rod 76 to the left. Such move.ment of connecting rod , 76 carries with it each of the brackets 73, causing each bracket to lift the movable contact rod of its unit 14 and thus open the contacts of all of the units and hold theni open. Also as described hereinbefore, the contacts of all units 14 may be opened from a remote location by energization of trip coil 118, which releases overcenter pivot 97 for movement upwardly, and this also releases spring 77 and permits it to open the contacts of all units 14, as previously describ,-d. Also the contacts of all units 14 may be manually opened and closed by movement of handle 188 in opposite direct;ons, as previously described, because this will move overeenter pivot 103 of the linkage overcenter in opposite directions to either release spring 77, or prevent operation thereof. Ftirtherinore, -,vhen the contacts of all Linits 14 ha@e been opened by either manual, power, or automat;c operation, they may be closed by eneraizat,.on of closing coil 134 from a remote point, which operates to reset toggle lever 99 and overcenter pivot point 103 to the position shown in Figs. 2 and 4. In order to provide more adequate protection a.-ainst line to ground faults on polyphase systems where feedback- from the other phases through transformers on the load side of the fault will prevent interruption of the @fault current by openin.a the grounded line, I modify the recloser of the '@A7allace et al. application Serial No. 184,482 by either adjusting or extending the operatin.rods 60 upwardly to effect eng-,tgement with radial cranks 85 on the first operation of any one unit of the recloser, thus opening all units, and locking them open. For example, the rods 60 may be threadedly disposed on the extensions 58 being held in place by lock- nuts 59. Reclosing may be effected by means of any suitable reclosing device such as wil.I be hereinafter described in detail. Referring to Fig. 4 of the draaings, it will be seen that the eleclrically operated three-phase circuit interrupter of Fig, I may be used -n coiiiunction w-ith oth,-r apparatus to provide grouiid fault protection by connecting the switch units 14 thereof in th.- several conductors 192, 193 and 194 of a polyphase circuit, which may be supplied with electrical energy fror@i the Y con10 nected secondary of a transiorr-lier 195 and connected to the Y connected primary of a transformer 196 for supplying load circuits. Reclosing of the circu;t i-Titerrupting device 3 may, as shown in Fig. 4, be controlled by a reclosing relay 200 15 wh-ich may be slibstantially of the type shown and describ--d in detail in Patent 2,439,920, Nvhich issued on April 20, 1948 to M. J. Brown, entillied Atitomatic and Mantial Control System for Circljit Br-,akers. Jn ge@-leral relay 200 may corrprise a timing motor 201 20 driving a series of cams 202, 203, 204 and '@0.5 fo@- operating cam switches 202a, 2C@3a, 204a aiad 205a. A lockout relay 206 of the toggle type having a Cshaped magnetic core 217 with operat'li.- and reset wiild-'Lngs 203 and 209 for actuating a to,@.lie type contact r@iember 210 back 25 and forth functions in conjuncv.'on with cam switchcs 204a and 205fi tb perniit a predet--rniined number ofenergizations of closing relay winding 165. After three such operations, reclosiri- re@lay 2C@O locks ope-@i. Cam switches 202 and 203 control operalioia of the, timing mo30 tor. 1,Vith the system in the operating condition shown in Fig. 4, a ground faL,.It oii any o@ie of th@a lir@e condtictors 192, 193 or 194 elerg@zes thecorrespondin- solenoid coil 23 sufficie-@itly to effect separation of ttic contacts of its jnit. The counti--lg piston 52 th@- reof is advanced; aiid operating rod 60 e-nga,ges radial trip crank 85, rotating trip,shaft 83 so that addilional crank 85 encages lever 189 rotatina shaft 186 and depressing pivot 142 so a@ to move l@--ver 99 clockwise and breal-, the toggle 40 relation between levers 96 atid 99. This permits lockout spring 77 to move lockout lever 76 to the left, actuating levers 73 to lock the contacts of all the units 14 open. The fault clirrent will therefore be interrupted as all phases are open. 45 !Vhen lever 99 liaoves cloc'-wise, armature 136 drops, r' extension 166 is removed froni interference ,vith lever 162 and closing relay 144 resets, and auxiliary switch contact 170a closes. This prov:des an obvious energiziiig I circuit for closing relay 144, extending froni one s:ide of 50 the soarce tl-irough conduc'cors 2.11, 212, contact 206a, conductor 213, cam switch 205ci, conductor 215, contact 170a, windina 165 and conductor 216 to the other side of the source. Closing relay 144 closes contacts 147 and 148, energizing closin,a winding 134 to rotat@- lever 99 55 counterclockwise and close i-@iterrupter units 14 byrelatchin@ lockout member 76, whereupon toggle levers 64-65 act to close the interrudter contacts. As soon as the iiilerrtipter devices close, extension 166 engages lever 162 to release contacts 147 148 and deener.-ize the clos60 ing relay 144 and closing -"il 134 When the closin- relay 144 is energized, operating windin- 208 of the relay 206 is energized in parallel therewith and toggle member 210 is actuated to the r-,'ght. This 65 clos,-s contacts 206b and sets up a -,ircuit ior the timIng motor 201 wliich operates cam switch 203a to set up ,t circ-oit for the motor iintil several de,-rees before reset, which occurs after 360 degrees of rotation. If the interrupter dev-lces remai.-i closed, the motor runs until cam switch 203a operis, whereupon the circuit is con70 tiiued to the reset position through cam switch 202a and auxiliary contact 170b. Relay 206 is reset through cam switch 204a after about 15 degrees of rotation. Should the interrupter deirice open foffowing the firstreclosure, a I second recl6sure will be initiated by cam 75 switch 205a after about 90 degrees of rotation in a man-

2,792,030 9 ner similar to that described, and a third one at about 180 degrees of rotation. The motor 201 continues to run, with cam switch 204a resetting relay 206 at about 350 de,rees. As the interrupters are open no motor circuit is completed through cam switch 202a and contact 170b, and the motor stops when cam switch 203a opens at about 354'. The interrupter device 3 is now locked open and may be reclosed by operating pushbutton switch 207, which provides an obvious energizing circt,.it for closing relay 164. Contact 170b then provides a reset circuil for timing motor 201 through cam switch 202a, which opens at 360 degrees to reset the apparattis for further operation. From the above description and accompanying drav,ings it will be obvious that I have prov:@ded a simple and inexpensive interrupter which is highly effectine in interrupting ground faults even in systems where 3-phase transforiners provide feedback. A system using an interrupter embodying the features of my invention will immediately interrupt all three phases so that reclosing may be successflilly effected if the f,@iiilt is not permaneiit. Instead of using the customary three pole circuit breaker, a r-.closing relay and three current transformers and their associated current relays, I utilize a relatively inexpeiisive recloser with a siiigle reclosing relay. Since certain ch,,inges may be made in the above-described co-@istruction, and different embodiments of the invention may be made without departing from th-. spirit or scope tliereof, it is requested that the matter contained in the above description and shown in t'@ie accompanying drawings be considered as illustrative and not in a limiting sense. I