Патент USA US2412934код для вставки
Dec. 17, 1946._ E. K. READ 2,412,934 CONTROL APPARATUS Filed Dec. 12, 1942 MA“ a I i724 1' g ' 105:; 73 75 / 17 15 1? 2 Z5 9.9 I 10; a? 23 1211”? 31951052 119 111 1”’ ’ <97 L9 . \ Q_ - 9.3 100 23\\ _ i” f - a? 3/ ‘if \ 191 112 117 77 mg 73 as I 89 . 5395 97 39 as I | 22?’; 1:;3 ‘7! 2'9 55’ _ L1 1795’. S 135 ,41 37’ ~49 33'- ‘ _.FL 59 if‘: 7 g9 \ __I_ “ml 2745 ' WITNESSES: 13'” 43 INVENTOR Ernest K. Read. 2,412,934 Patented Dec. 17, 1946 UNITED STATES PATENT OFFICE 2,412,934 CONTROL APPARATUS Ernest K. Read, Wilkins'burg, Pa., assignor to Westinghouse Electric Corporation, East Pitts burgh, Pa., a corporation of Pennsylvania Application December 12, 1942, Serial No. 468,7.61 17 Claims. (Cl. 175—294) 2 This invention relates to switches for the con relay with both coils deenergized and in the nor trol of electrical apparatus and particularly for the control of circuit interrupters. mally open position; and Fig. 3 is a diagrammatic view showing the relay An object of the invention is to provide an im connected in a control circuit for controlling the proved arrangement for controlling the closing operation of a circuit interrupter. Referring particularly to Fig. 2 of the drawing, the control relay comprises generally an electro of a circuit interrupter which also prevents re peated opening and closing or “pumping” of the breaker. Another object of the invention is to provide ' magnet H mounted on a base l3 of insulating an improved control relay wherein a toggle is - operable by an electromagnet to effect closing of a control circuit, the toggle being rendered non-responsive to the action of 'said magnet by manually operable means. Another object‘ of the invention is to provide an improved control relay for controlling the closing of a circuit interrupter wherein manual means of screws 29. anism for the relay contacts inoperative. Another object of the invention is to provide an improved control relay wherein the operating mechanism for the relay contacts is operated by an electromagnet with means for restraining the operating mechanism in operative position, and current-responsive means to effect opening of 02 .2,, the contacts irrespective of the energized condi tion of the electromagnet. Another object of the invention is to provide an improved control relay with means for latch 31 tion and manual means for rendering said toggle inoperative at will. Another object of the invention is to provide an improved control relay having a magnetically operated toggle for closing the relay contacts in " which a thermal element is provided in the con tact ll, an operating mechanism 19, a thermal trip device 2| and a manual operating device 23. The electromagnet l I includes a frame of mag netic material comprising an upper frame mem ber 25 and a lower frame member 21, both frame members being rigidly secured to the base [3 by means is provided to render the operating mech ing the contact operating toggle in operative posi material, a stationary contact l5, a movable con Two side frame members also of magnetic material are provided compris ing plates 3| and 33 (Fig. l) which are secured by means of screws 35 to the frame members 25 and 21. An intermediate frame member 31 of magnetic material is suitably secured to the side members 3| and 33 by screws (not shown). It will be obvious that the frame of the electro magnet H may be a one piece casting if desired. A stationary core member 39 has a reduced upper end which ?ts in an opening in the upper frame member 25 of the magnet frame. The lower end of the core member 39 is also reduced and ?ts into the upper end of a tube 4| of non-magnetic material. The tube 4! extends downwardly through an opening in the intermediate member 31, and its lower end rests on a screw plug 43 threadedly engaging an opening in the lower frame member 21 of the magnet frame. A look nut 45 is provided to lock the screw plug 43 in position. A portion 41 of the plug 43 projects into the tube 4| and serves as a lower stationary trol circuit to effect opening of the contacts irre spective of the operation of the magnet, and man ually operable means for resetting said toggle to core member. operative position. tube 4| is a movable core member 49 having an Disposed for reciprocable movement within the The novel features that are considered char operating rod 53 secured to the upper end thereof acteristic of the invention are set forth in par and projecting upwardly through an opening in the stationary core 39. Energizing coils 55 and 51 surrounding the tube 4| and core members are disposed respectively between the interme diate frame member 3'! and the upper member 25, and between the intermediate member 37 and the lower frame member 21. It may be noted here ticular in the appended claims. The invention itself, however, both as to structure and opera tion, together with additional objects and advan tages thereof, will be best understood from the following detailed description of an embodiment thereof when read in conjunction with the ac companying drawing, in which: Figure l is a top plan view of a relay embodying the principles of the invention showing the relay contacts in the closed position; Fig. 2 is a vertical sectional view taken substan tially on the line II—-II of Fig; 1 showing the that the upper coil 55 has a greater number of turns than the lower coil 51, so that when the coils are energized simultaneously the upper coil exerts the greater pull and moves the movable core 49 upwardly against the stationary core 39. Also, when both coils are deenergized, the mov 55 able core 49 is biased to a neutral or intermediate 2,412,934. 3 4. position by a relatively weak coil spring 59 dis posed in a spring seat in the plug 43 and bearing sponse to the ?ow of current therethrough, they de?ect upwardly releasing the toggle support link 89 to effect opening of the contacts |5—l'l as against the oottom of the movable core mem will be hereinafter described. her as. The manually operable member 23 is provided The stationary contact i5 is mounted on the for the purpose of reengaging the toggle support lower end of a conductor El secured to the upper link 89 with a latch I89 after the contacts have portion of the base l3, the upper end of the con been opened under the control of the thermal ductor terminating in a connector (not shown) trip device 2!. The member 23 may also be op for connecting the contacts in an electrical cir~ cult. The movable contact I‘! is secured to a 10 erated to manually actuate the latch member Iii‘! to thereby cause opening of the relay contacts contact arm 63 pivotally supported on a pivot l5—l'l independently of the coils 55—5'| and of pin 65 mounted in a channel-shaped switch mem ber El. the thermal elements I03. The switch member 6'! is pivotally The cup-shaped member or knob 23 is made mounted on a pivot pin 69 supported in a frame comprising frame members ‘H and 13 (Fig. 1) of insulating material and is rotatably and slid of insulating material secured by means of screws 15 to the upper magnet frame member 25, and ably mounted on a sleeve III also of insulating material which is rigidly secured in a recess in the cross member ll. The knob 23 has a rod H3 rigidly connected at their left-hand ends (Figs. (Fig. 2) rigidly secured to the inner wall thereof. The rod H3 projects through an opening in the 1 and 2) by a cross member Tl also of insulating material. The cross member TI is secured to the frames "H and 13 by means of screws 19 (Fig. 1). cross member Ti, and a cam H5 is secured to the rod on the inner side of the member 17. A The frame comprising the members 1!,13 and coil spring H? surrounding the rod H3 and dis posed between the knob 23 and the cross member '71 biases the knob 23, the rod H3 and the cam H5 outwardly, which movement is limited by Ti may be of one piece moulded insulating ma terial if desired. The operating mechanism 19 includes a toggle comprising links BI and 83 which has one end pivotally connected by means of a pivot pin 85 to the switch member 67, and the other end of the toggle is pivotally connected by means of a pivot pin 81 to a link 89 which is pivotally mounted on a pivot pin 9! supported in the frames H and 73. The toggle links 8! and 83 are pivotally connected together by a knee pivot pin 93. The toggle link 8| has spaced sides rigidly connected by a yoke Q5, and the toggle link 83 comprises a pair of parallel links. The link 89 supporting the left-hand end of the toggle 8 i—83 is U-shaped having its sides connected by an in~ tegral cross portion 91, the upper end of which is formed over substantially as shown at 98 (Fig. 2). Contact pressure is provided by a leaf spring 99 having an arcuate lower end bearing against the pin 35. The upper end of the spring 9t bears against the contact arm 63 and the mid-portion of the spring 99 is borne upon by the connecting part of the channel-shaped switch member 61 to engagement of the cam I I5 with the cross mem ber 11. ~ After the contacts [5-11 have been operated to the open position by the action of the thermal trip device 2|, releasing the support link 89, the link may be reengaged with the latch I09 by pressing the knob 23 inwardly. At this'move merit, the inner end of the rod H3 engages the pivot pin 8'! and rotates the link- 89 clockwise to reengage the end 93 of the link with the latch H19. Also during the inward movement of the knob 23, projection H9 on the inner part thereof engages a slot [2! in the sleeve III to prevent rotation of the knob 23 and consequently of the cam H5. The purpose of the cam I l 5 is to manually dis engage the latch lll9 from the support link 89 to thereby render the device non-responsive to the electromagnet H. The manual operation of the latch ID‘! iseffected by rotation of the knob 23 and, therefore, of the cam I I5 in either direction. During this rotation, the cam H5 engages and tension the spring in a direction to bias the con tact arm 63 in contact closing direction. When raises the latch member l9‘! to disengage the latch its from the end 93 of the link 8.‘), thus rendering the relay inoperative to close the, cone the switch arm 6'‘! is in the open position (Fig. 2), the clockwise movement of the contact arm , 53 about its pivot 65 is limited by a projection I09 thereon striking the pivot pin 85 which connects the toggle link 8! to the switch member 5?. tacts or to hold the contacts closed. In this man; ner, the relay contacts may be opened and held The switch member 61 is biased in a counter clockwise or opening direction by a coil spring llll having one end hooked over the right-hand end of the frame members 7! and 13 and the other in the open position irrespective of the energiza tion of the coils 55-5l and operation of the the latch We normally prevents counterclockwise latching position. rod 53. When the knob 23 is rotated in order to render the closing mechanism ineffective to close the con end bearing against the switch member. tacts, the projection H9 on the knob is moved The thermal trip ‘device 2| is provided to cause automatic separation of the contacts l5—|1 in 60 away from the slot i2! in the sleeve in order to prevent inward movement of the rod H3. This the event that the relay remains energized too prevents movement of the rod to actuate the link long, or if the current traversing the circuit of 89 to relatching position While the latch I0? is the device is of too great a value. The trip device held in unlatching position by the cam H5. In comprises a pair of bimetal elements “33 secured order to reset the device, the knob 23 is ?rst ro by means of screws I05 to the insulating frame tated to align the projection E £9 with the slot I25. ‘13 and extending inwardly therefrom (Fig. 1). This moves the cam H5 out of engagement with At their inner ends, the bimetal elements I63 the latch member H37, and the resilience of the carry a latch member Hl'l of conducting material bimetal elements H33 moves the latch member suitably rigidly secured thereto and having a llll downwardly until the latch Hi9 rests upon the latching projection I09 normally in engagement top of the projection 98. The knob 23 may now with the formed end 98 of the support link 89. be thrust inwardly to actuate the link 89 to re The engagement of the end 98 0f the link' 89 with Hi3 are heated a predeterminedramount in re . The relay is shown in Fig. 2 with the coils 55 rotation of the link. When the bimetal elements 75 and El deenergized and the contacts in the nor-_ 2,4'12,934 . 7 tively movable relay contacts, an operating toggle operatively associated with said contacts, a pair 8 releasable member to effect opening of the relay contacts irrespective of the energized condition of said electromagnet, and manually operable means of electromagnets having an armature for actu ating said toggle to close said relay contacts, a to reset said releasable member. control circuit, said electromagnets being con U! 5. In a control relay, the combination of rela nected to be energized by said control circuit, one tively ‘movable relay contacts, a toggle having of said electromagnets having a greater attractive one end operatively associated with said relay force than the other, means operated by the clos contacts, a releasable member supporting the ing of the circuit interrupter to deenergize said other end of said toggle, electromagnetic means one electromagnet and permit the other of said 10 comprising an electromagnet for operating said electromagnets to attract and restrain the arma~ toggle to close the contacts, a bimetallic latch ture in inoperative position, and a thermal ele normally engaging and restraining said releas ment releasably restraining said toggle in oper able member in a ?xed position, said bimetallic ative position, said thermal element being heated latch being operable in response to predeter in response to the current in the control circuit mined abnormal conditions to release said releas and operable to release said toggle to thereby able member to thereby eiTect automatic opening cause opening of said relay contacts and deen of the relay contacts irrespective of the energized ergization of said closing means irrespective of condition of said electromagnetic means, and the energized condition of said electromagnets. manually operable means movable to one posi 2. An electrical apparatus, the combination of tion to engage and reset said releasable members a circuit interrupter having closing means, a re and settable to another position to engage and lay for controlling the energization of said cir render said bimetallic latch permanently ine?ec cuit interrupter closing means including rela tive to restrain said releasable member. tively movable relay contacts, operating mecha 6. In a control relay, normally open contact nism for said relay contacts, a pair of electro— 25 means, a toggle operatively associated with said magnets having an armature for actuating said contacts, electromagnetic means for operating operating mechanism to close said relay contacts, said toggle to close the contacts, thermally re one of said electromagnets when energized having sponsive means for engaging and‘ releasably re a greater attractive force than the other, a, con straining said toggle in operative position, said trol circuit, said pair of electromagnets being 30 thermally responsive means being operable in connected to be energized by said control circuit, response to predetermined abnormal conditions means operated by the closing of said circuit to release said toggle, and manual means oper ' interrupter for deenergizing said one electromag able on one direction to engage and reset said net to permit the other of said electromagnets to toggle to operative position and operable in an attract and restrain the armature in inoperative 35 other direction to actuate said thermally re~ position, a trip device including a thermal ele spo-nsive means to release said toggle. ment heated in response to the current in the 7. In an electrical apparatus, the combination control circuit and operable when heated a pre determined amount to cause opening of said relay contacts irrespective of the energized condition of said pair of electromagnets, and manually op erable means for resetting said trip device. 3. In an electrical apparatus, the combination of relatively movable relay contacts for control ling the energization of an operating device, a control circuit for energizing said operating de vice, operating mechanism for said relay con tacts including a toggle operable to close said relay contacts, means for releasably restraining one end of said toggle in operative position, means ' comprising an electromagnet having an armature for actuating said toggle to close the relay vcon tacts, a trip device including a bimetal element heated in response to the current of said control Of a switch member movable to a closed and an open position for controlling the energization of ' a circuit interrupter operating device, a control circuit for energizing said operating, device, op erating mechanism for said switch member in cluding a toggle operatively associated with said switch member, means comprising a current re sponsive element for engaging and restraining said toggle in operative position, electromagnetic means comprising a pair of windings operable when energized to operate said toggle to an un derset position to move said switch member to closed position, and to hold said switch member in closed position only when said magnetic means is energized, said current responsive means op erable in response to the current of the control circuit to release said toggle and thereby effect circuit, said bimetal being operable to effect open movement of said switch member to open position ing of the relay contacts irrespective of the ener to deenergize the operating device, and a rotat gized condition of said electromagnet, and man able member for operating the current respon ual means for resetting said restraining means, sive element to release the toggle. said manual means being settable to a position to 8. In a control relay, the combination of rela~ permanently render the toggle ineffective to close 60 tively movable contacts for closing and opening the relay contacts. a control circuit, a switch member movable to 4. In an electrical apparatus, the combination close and open said contacts, operating mecha of an operating device, a control circuit for ener nism for said switch member including a toggle, gizing said operating device, relatively movable relay contacts for controlling said circuit, operat means comprising a thermal element for engag ing mechanism for said contacts including a tog ing and releasably restraining said toggle in op gle having one end operatively associated with erative position, electromagnetic means for op said contacts, the other end of said toggle being erating said toggle including a pair of windings, supported on a releasable member, electromag one of said windings when energized exerting netic means for operating said toggle to close the a greater force than the other of said windings, contacts, means comprising a bimetal element for means for deenergizing said one winding to per restraining said releasable member in ?xed posi mit the other of said windings to effect opening tion, said bimetal element being heated by the movement of the toggle and said switch member, current of the control circuit and operable when said thermal element being operable in response heated a predetermined amount to‘ release said to predetermined ‘conditions in the control cir 2,412,934.? mally open position, When both coils are'ener- , gized the .attractive force produced by the upper coil predominates and moves the core 49 upwardly against the stationary core 39, thereby thrusting the spring IOI to actuate the switch member 67‘ to the open contact‘ position. The movable core 49 will be held against the lower stationary core 41 as long as the control switch I53 is held closed, BI—83. Since at this time the link 85 is latched energizing the coil 51, thus holding the energizing circuit for the interrupter operating winding I25 against counterclockwise movement, the thrust open. the rod 53 upwardly to straighten the toggle of the toggle rotates the switch arm 5? clockwise . to close the contacts. The upward Or straighten If the circuit interrupter i2? is closed while an abnormal circuit condition is present in the ' ing movement of the knee of the toggle 8I—83 is 10 main circuit, the circuit interrupter will be tripped to open position, thereby opening the auxiliary limited by‘the yoke 95 engaging a pin I23 mounted inv and extending between the toggle links 53 to the left of the knee pin 93. The limiting stop I23 limits upward movement of the toggle to a slightly underset position in which the knee pin -93 is 15 switch I37. If the control switch I43 is in closed position at this time, the coil 55 is again ener gized, but the attractive force of the coil 55 is not slightly below a line joining the pivot pins 85—8‘I. and the stationary core 5?, and the relay contacts Consequently, when the coils 55—5'I are deener gized and the core 45. and rod 53 resume their normal position, the spring It! acts to move the switch arm 51 to open position, the toggle til-83 collapsing to the position shown in Fig. 2. Referring to Fig. 3, the operating winding I25 of a circuit interrupter, shown schematically at I2‘! is connected in series with a control circuit I2;9——I3I, the circuit extending from the con ductor I29 through the winding i525, over a wire I33, thru the bimetal elements I03 and latch member IIJ'I, a flexible shunt conductor I35 con necting one of the bimetals £53 to the movable contact I7, the contact l5 to the conductor 53!. The coils 55 and 5'! are connected in series relation across the conductors l25—i5l. An auxiliary switch I3? is operated by the circuit interrupter I2? and is employed to short circuit the upper or great enough to move the core 45 from the coil 5‘! I5-l'l will remain open as long as the control switch M3 is held closed. . , When the control switch I43 is opened, both of the coils 55 and 5'! are deenergized and the spring 59 moves the core 49 to its neutral position as shown in Fig. 2. By the use of the toggle iii-83, a mechanical advantage is gained which permits the use of less, force for closing the relay contacts. The relay is, therefore, of a design which provides a longer interval of time before the magnetic flux falls to the point where the relay contacts will open. This is a desirable advantage because is provides sufficient time delay after the relay closing coil 55 is shunted out to permit the circuit interrupter to be moved to full closed position and latched closed before the operating winding l 25 is deener gized by opening of the control relay contacts relay closing coil 55 when the circuit interrupter 35 Another advantage of the invention resides in I2? is in closed position, the contacts of the aux the provision of the thermal trip device which iliary switch I31 being connected to opposite sides functions to cause opening of the relay contacts, of the coil 55 by means of Wires I39 and ME. A if the relay stays closed too long or if the current control switch I53 is connected in series with the coils 55--5'I. . 40 is too} great in the control circuit. The relay contacts will be tripped open in response to oper The circuit breaker l2? may be tripped open by ation of the thermal trip device irrespective of means of a trip coil Itia'energized by any suitable the position of the closing mechanism, and irre means, for instance, a protective relay‘ (not spective of energization of the relay closing coil shown), in response to abnormal conditions in the 55, thus protecting the operating winding I25 circuit controlled by the breaker I21. With the from damage resulting from abnormal circuit circuit interrupter l2‘? in open position and the conditions in the contact circuit. The bimetal control relay contacts l5—l'l open, as shown in element I03 is calibrated to de?ect and release Fig. 3, it is necessary to close the contacts i5—i'l the toggle in response to prolonged flow of normal of the relay in order to energize the interrupter operating winding I25. This is eifected by clos 50 current in the control circuit. In addition, there is provided manually op ing the control switch :53 to simultaneously ener erable means for resetting the trip device follow gize the coils 55—57. Because the coil 55 produces a greater magnetic force than the coil 57, the mov ing an automatic opening or the contacts in re able core 55 will, upon energization of the coils, sponse to abnormal conditions. The manually be attracted upwardly to effect closing of the operable means is also operable to effect opening contacts I5--ll in the previously described man of the relay contacts irrespective to the position . ner to complete the circuit to the operating wind or energized condition of the relay closing coil 55 ing I25. Upon energization of the Winding I 25, and also to render the operating mechanism' of the circuit interrupter I21 is operated to its closed the relay non-responsive to the coil 55 to close position where, under normal conditions, it re 60 the contacts so that the relay cannot be oper mains latched against an accelerating spring I55 ated to close the contacts as long as the knob 23 which biasesithe interrupter to open position due is in looking position. to the overcenter condition of an operating toggle Having described a preferred embodiment of the invention in accordance with the patent stat Toward the end of the closing movement of the 65 utes, it is to be understood that various changes circuit interrupter I27, the auxiliaryswitch I37 and modi?cations may be made therein without closes the circuit that shunts out the relay closing departing from some of the essential features of coil 55. shunting out the coil 55 causes the mag the invention. It is, therefore, desired that the netic ?ux of the core 39 to fall to a point where language of the appended claims be interpreted the still energized coil 57 will attract the movable as broadly as the prior art permits. I47. ' ‘ core 59 and move the core 49 and the rod 53 to the lowermost limit of their downward travel wherein the movable core 49 is held against the I claim as my invention: 1. In an electrical apparatus, the combination of a circuit interrupter having closing means, a stationary core 41 (Fig. 2) '. The downward move relay for controlling the energization of said cir-~ ment of .the rod, as previously, described, permits .75 cuit. interrupter closing means including rela '. 9 2,412,934 cuit to release the toggle to thereby e?ect open ing movement of the toggle and the switch mem ber irrespective of the energized condition of said windings. 9. In a control relay, the combination of rela- ' tively movable contacts, a switch member op erable to close and open said contacts, operating mechanism for said switch member, means for 10 to actuate said thermal element to a permanent non-restraining position. 13. In a control relay, the combination of rela- ‘ tively movable contacts, a toggle movable to an underset position to close said contacts, electro magnetic means for moving said toggle to close said contacts and hold said contact closed only when said electromagnet is energized, means for causing energization of said electromagnet, said eiectromagnet comprising a pair of windings one of said windings having a greater force than the other for moving said toggle to close the contacts, switch means operable upon closure of able core member including a pair or“ windings, one of said windings when energized exerting 15 said contacts for effecting deenergization of said one winding, said other winding upon deener a greater force than the other winding on said gization of said one winding attracting and mov movable core member, means for deenergizing ing said armature to permit movement of said said one winding to permit the other winding toggle to open said contacts. to attract and restrain the movable core member 14. In a control relay, the combination of rela in inoperative position, and manually operable means for operating the restraining means to 20 tively movable contacts, a linkage movable to an underset position to close said contacts, an ar permit movement of' the operating mechanism mature for moving said linkage to said underset and the switch member to open position irrespec position, and an electromagnet comprising a pair tive of the energized condition of said windings. of windings for actuating said armature, means 10. In a control relay, the combination of re1a~ for effecting simultaneous energization of said tively movable contacts,’ a switch member mov 25 windings, one of said windings having a greater able to close and open said contacts, operating attractive force than the other winding for op mechanism for said switch member including a erating the armature to close the contacts, means toggle operable to an underset position to move operable upon closure of said contacts to eifect the switch member to close the contacts, electro 30 deenergization of said one winding, said other magnetic means for actuating said toggle to move winding upon deenergization of said one winding said switch member to closed position, said toggle attracting and moving the armature to thereby holding said switch member in closed position permit movement of said linkage to open the only when the electromagnet is energized, and contacts. releasably restraining the operating mechanism in operative position, a movable core member operable to actuate the operating mechanism to move said switch member to closed position, electromagnetic actuating means for said mov manual means operable to render said electro~ magnetic means permanently ineffective to move the switch member to close the contacts irrespec tive of the energized condition of said electro magnetic means. 11. In a control relay, contact means, operat 15. In a control relay, the combination of rela tively movable contacts, a toggle movable to an underset position to close said contacts, an ar mature for moving said toggle to said underset position, electromagnetic means including a pair of windings, switch means for energizing said ing mechanism for said contacts, electromagnetic windings, one of said windings exerting a greater means operable when energized to actuate said attractive force than the other for operating ’ operating mechanism to close the contacts, said said armature to close the contacts, switch means operating mechanism being capable of holding for deenergizing said one winding, said other said contacts closed only when said electromag 45 winding upon deenergization of said one winding netic means is energized, thermally responsive moving the armature to a position to permit means releasably restraining said operating movement of the toggle to open the contacts, mechanism and operable in response to prede a thermally responsive element operable to effect termined abnormal conditions to release the oper opening of said contacts irrespective of the ener ating mechanism and eifect opening of the con gized condition of said windings. tacts irrespective of the energized condition of 16. In a control relay, the combination of rela the electromagnetic means, and manually op tively movable contacts, a toggle movable to an erable means movable in one direction for actu underset position to close said contacts, an ar ating said thermally responsive means to effect mature for moving said toggle, electromagnetic release of the operating mechanism and opening means including a pair of windings, switch means of the contacts irrespective of the energized con operable to energize said pair of windings, one dition of the electromagnetic means, said man of said windings exerting a greater attractive ually operable means being movable in another force than the other winding for operating said direction to reset said operating mechanism to armature to close the contacts, a switch operable operating position. 60 to cause deenergization of said one winding, said 12. In a control relay, the combination of rela other winding upon deenergization of said one tively movable contacts, a switch member‘ mov winding moving the armature to permit move able to close and open said contacts, operating ment of said toggle to open said contacts, a ther mechanism for said switch member including a mally responsive element operable to e?ect move— linkage, electromagnetic means for operating said ment of said toggle to open said contacts irre linkage to an underset position to move said spective of the energized condition of said wind switch member to close the contacts, said linkage ings, and manual means for resetting said toggle. holding the contacts closed only when said elec 17. In a control relay, the combination of rela tromagnet is energized. a thermal element re leasably restraining said operating mechanism 70 tiveiy movable contacts. a toggle movable to an underset position to close said contacts, an ar and operable in response to predetermined ab mature for moving said toggle, electromagnetic normal conditions to effect movement of said means including a ‘pair or" windings, a switch for linkage and said switch member to open the effecting energization of said windings, one of said contacts irrespective of the energized condition oi windings exerting a greater attractive force than the electromagnet, and manual means operable the other winding for operating said armature 2,412,934 11 to close the contacts, a switch operable to deenergize said one winding, said other winding upon deenergization of said one winding operating the armature to a position to permit movement of said toggle to open said contacts, a 5 thermally responsive element operable to eifect ‘movement of said toggle to open the contacts 12 irrespective of the energized condition of said windings, andmanual means operable to reset said toggle, said manual means being also oper able to e?ect movement of said toggle to an in operative position. ' ERNEST K. READ.