41-661.1B

2.1. TIMING UNIT

The timing unit contains a synchronous motor andgear train mounted behind the front sub-base. Thegear train drives a drum with cams, which actuatecontacts 1, 2, 3, 4 and 14. Cam 5 actuates the Y unitlatch to reset the Y unit and close the Y13 contact.Cams #1 and #2, which operate contacts 1 and 2 re-spectively, are notched and are not intended to be ad-justed in the field. Cam #3 is a series of flat springssecured by screws, which can be located at any pointon the periphery of the drum. Cams #4 and #5 consistof screws which can be set at any point on the periph-ery of the drum. Cam #14 is a single Micarta block, lo-cated at the rear of the cam #5 position and held by a#5 cam screw.

The gear train reduction ratio is adjustable. The drumspeed dial contains indices, which are lined up with anindex mark to mesh the proper gears for the desireddrum speed. A clamping screw is provided at theedge of this dial. A push rod is located on the front ofthe drum to disengage the drum and permit free man-ual drum rotation.

The dial on the timing drum has 60 divisions (secondintervals with 60 second drum speed). The edges ofthe #3, 4 and 5 cam slots have 12 equally spacedwhite marks corresponding to 5 second intervals witha 60 second drum speed.

2.2. Y SOLENOID UNIT

The Y unit coil is located to the rear of the front sub-base. When energized, a plunger is attracted towardthe rear of the relay against a spring. A Micarta discon the front end of the plunger actuates contacts Y5,Y6 and Y7. As the disc moves to the rear it releasesthe latch arm. When released, the latch arm is rotatedcounterclockwise by the tension of the moving con-tact spring of contact Y13 and a small helical spring.This rotation blocks the full reset when Y is de-ener-gized. Thus, the Y unit has three positions as shownin Table 1. The Y unit, is reset by the #5 cam on thetiming drum, which rotates the latch arm clockwiseagainst the tension of the Y13 moving contact spring.

2.3. INSTANTANEOUS Z UNIT (WHEN USED)

The Z unit is a clapper type auxiliary relay (standardSG) with one make contact, Z10, and make-breakcontacts, Z11 and Z12.

2

3.0 OPERATIONOperation of the relay and associated equipment willbe described, using the external schematic in Figure7, in conjunction with Figures 4 and 5, which showcontact positions as a function of the drum position.Figure 5 is based on the factory cam adjustment;immediate, 15 and 45 second reclosures, with onedrum revolution on 60 seconds. It is further assumedin Figure 5 that the instantaneous trip is locked outafter the first reclosure, and the fault is not clearedprior to lockout.

3.1. MOTOR CONTROL

Motor energization is controlled by cams 1 and 2. Inthe start position the motor is energized through #1and 52b contacts when the breaker opens. As thedrum moves away from the start position, #2 contactcloses to energize the motor through the 52a contactduring the time that the breaker is closed. If thebreaker is closed at the lockout position the drum willcontinue to rotate until the #2 contact opens at thestart position. If the breaker is open, the drum willstop in the lockout position, since the #1, 52a and Y7contacts are all open at this point.

Contact Y7 keeps the motor energized, when thebreaker remains closed after an immediate reclo-sure, until the #2 contact can close. For this condi-tion, 52b opens before the drum can rotatesufficiently to close the #2 contact. Contact Y7 hasno significance during subsequent reclosing opera-tions.

3.2. CLOSING SEQUENCING

The number of reclosures and the time at which theyoccur is determined by the location of the #3 camscrews, which close the #3 contact.

Table 1Y UNIT CONTACT POSITIONS

Plunger Contact PositionPosition Y5 Y6 Y7 Y13

Reset Closed Open Open ClosedLatched andDe-energized(Intermediate) Open Open Closed OpenEnergized Open Closed Closed Open

41-661.1B

3.3. INSTANTANEOUS TRIP LOCKOUT

As shown in Figures 5 and 7, the trip circuit of theinstantaneous trip units is opened by Y13 and 14contacts from the time of the first reclosure until thedrum returns to the start position. During the initialreclosing, contact Y13 is opened and remains openuntil the Y unit is completely reset at 6 seconds. Thepurpose of contact Y13 is to keep the trip circuit openuntil cam contact, 14, can be opened by the drumrotation. Contact Y13 has no significance during sub-sequent reclosing operations.

3.4. X-Y ANTI-PUMP CIRCUIT

Referring to Figure 7, when the breaker close circuitis energized through 52bb, Y5 and #3 contacts, the79X coil is also energized. Then, X8 and X9 contactsseal around the Y5 contact and energize 79Y coil,respectively. Contact Y5 opens and remains openuntil the Y unit is completely reset at 6 seconds. Asthe breaker closes, 52bb contact opens, de-energiz-ing the X and Y coils. Should the breaker immedi-ately trip again, contacts Y5 and X8 will open toprevent premature energization of the breaker closecircuit.

3.5. COMPLETE OPERATING SEQUENCE

3.5.1. Fault-Trip – Immediate Reclosure

With the timing drum in the “START” position (Figure7), a #3 cam spring will be holding contact #3 closed.The breaker switch contacts 52b and 52bb close,energizing the motor 79M through contact #1, andthe drum begins to rotate. At the same time the coilof the contactor unit, 79X, is energized through drumcontact #3, and Y5. When the breaker latch-checkingswitch, 52LC, closes, the breaker control relay 52X isimmediately energized through the pre-closed con-tacts Y5 and #3. This in turn energizes the closingcoil of the breaker, 52CC. Simultaneously, contactorunit, 79X, seals in through its contact X8, while itsother contact, X9, energizes the coil of solenoid unit79Y to open contacts Y5 and Y13 and close contactsY6 and Y7. As the circuit breaker closes, the breakerauxiliary switches 52b and 52bb open, and 52aacloses. Opening 52bb de-energizes 79X and 79Y.The latter then resets against its latch to open con-tact Y6 and remains in this position, thus leaving con-tacts Y5 and Y13 open and contact Y7 closed untilthe latch is released. Before the latch is released, the

drum operated contact, 14, will be opened and willremain open until the drum returns to the “START”position.

3.5.2. Preparing for Second Reclosure

The drum continues to rotate, since the motor isenergized through Y7. When the breaker trips thesecond time, no immediate operation occurs. Atabout one second, #2 cam contact closes to set upthe motor circuit when the breaker is subsequentlyreclosed. At about the three second drum positioncontact #3 opens. At about 6 seconds, the Y unitlatch is released by the #5 cam, resetting the Y unit.The relay is now ready for another reclosure as soonas contact #3 is closed by the #3 cam spring. Thedrum will continue to rotate, since the motor is ener-gized through 52b and #1 contacts.

3.5.3. Second and Third Reclosures

At 15 and 45 seconds the #3 contact closes toreclose the breaker. After each reclose, the Y unit isunlatched by the action of cam #5.

3.5.4. Lockout

When the drum reaches the lockout position, themotor is de-energized, since cam contact #1 opens(assuming the breaker is open). The breaker mustthen be closed by the control switch. If the breakerthen remains closed the drum will rotate to the“START” position, where the motor is de-energizedby the #2 cam contact.

3.6. OPTIONAL ARRANGEMENTS

Alternate operating arrangements as describedbelow.

3.6.1. Reclosing Through Contact Y6

As shown in Figures 6, 7 and 8 the close circuit canbe energized through contact Y6, where an indepen-dent contact is required or where a reclosing delay isdesired. Y6 closes approximately 6 cycles after 79Xis energized.

3.6.2. Lockout Alarm

A #4 cam screw can be set to close the #4 contact inthe lockout position. By jumping terminals 4 and 6and connecting terminal 7 to an alarm circuit, analarm will be sounded when the breaker locks out.

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41-661.1B

3.6.3. Additional Instantaneous Tripping

Contact #4 can be set to re-establish the instanta-neous trip circuit after the last reclosure and prior tolockout, if the instantaneous trip pickup is aboutequal to the time-overcurrent unit pickup. In this casere-establishment of the instantaneous trip insuresbreaker lockout if the fault current is near pickupvalue. The instantaneous trip circuit can alternatelybe re-established each time the Y unit is reset byshort circuiting the #14 contact with a jumper.

3.6.4. Selective One-Shot Instantaneous Reclosing

By eliminating the #3 cam in the start position and byusing terminals 16 and 17 with an external device,selective, instantaneous reclosing can be obtained.When the contact of the external device closes,reclosing will occur in the same manner as if #3 con-tact closed. Further reclosing by this means can beprevented by using either the Y13 and 14 contact cir-cuit or by using the #4 contact circuit. In the lattercase, the #4 cam is set for contact closure in the startposition.

3.6.5. Relays with Z Unit

As shown in Figure 8 the Z unit is energized by a 52bcontact. Z unit contacts perform the same functionsas 52a and 52b contacts. The use of this unitreduces the number of control wires required.

3.6.6. Motor Operation From DC

An external inverter is available for operation of themotor from either 125 or 250 volts dc. The dc termi-nals of the inverter are connected in place of termi-nals 8 and 9 in Figure 7. Terminals 8 and 9 are thenconnected to the ac terminals of the inverter. Thisarrangement permits the use of an intermittentlyrated inverter, since the dc terminals are not continu-ously energized.

3.6.7. Automatic Reclosing with the RC and CVX-1, (CVE-1), Relays

The scheme in Figure 9 and the timing chart in Fig-ure 10 illustrate automatic reclosing with RC reclos-ing relay and the CVX-1, (CVE-1) synchro-verifierrelay with line and bus voltage units. The RC usedhere has internal wiring as shown in Figure 11. Com-parable wiring may also be provided in an RC relaywithout the Z unit. Refer to I.L. 41-682 for data on theCVX-1 relay or I.L. 41-681.1 for data on the CVE-1relay.

This scheme provides the following features:

A. SELECTIVE INSTANTANEOUS RECLOSURE –following a high speed (HS) trip operation

B. TIME DELAYED RECLOSURE WHEN:

1. Line is hot and bus is dead

2. Line is dead and bus is hot

3. System is in synchronism

C. INTERMEDIATE LOCKOUT

Should reclosing be otherwise unsuccessful themotor is stopped at an intermediate lockout posi-tion, with subsequent single shot reclosing onlywhen the line becomes re-energized and is insynchronism with the bus voltage.

D. MOTOR-SUPPLY TRANSFER

Should the bus become dead the motor supply istransferred automatically to line side potential.

E. A contact is provided to actuate a time-delayedexternal alarm for intermediate lockout. Anotherindependent contact is used to alarm for finallockout.

3.7. RC SETTINGS

In the RC relay per internal schematic 188A184 (Fig-ure 11), the connection between contact #3 and theanti-pump circuit has been separated so that externaldevices can be connected between terminals 16 and18, as shown in Figure 9. Some of the factory camsettings for the RC relay must be changed to providetiming as shown in Figure 10. The cam spring whichpre-closes the #3 contact in the start position shouldbe removed so that instantaneous reclosing may beinitiated by the SX and #14 contacts. The third reclo-sure must be advanced to the 40 second point orearlier by moving the associated #3 cam spring; theassociated #5 cam screw must be relocated to resetY at 45 seconds. Also, a cam spring must be addedto cause #3 contact closure at 50 seconds (or earlier)for reclosure under synchro-verifier control at inter-mediate lockout, and a #5 cam screw must be addedto reset Y before the final lockout or start positionsare reached after the final reclosure.

A #4 cam screw must be added to provide a closureat approximately 48 seconds, just prior to the inter-mediate lockout position. In this scheme the #4contact functions not only to actuate the final lockout

4

41-661.1B

alarm but also to control intermediate lockout and thefollowing reclosure, via auxiliary relays 79-4X and79-4Y, upon restoration of line voltage after a perma-nent fault. If intermediate lockout is desired at a timeless than 50 seconds from the start of the reclosingsequence, the cams which actuate the #3 and #4contacts may be moved to close sooner than the 50and 48 second points shown in Figure 10. Approxi-mately 10 seconds must separate reclosures toinsure that the Y unit has sufficient time to be resetby the #5 cam. Thus, to advance the intermediatelockout time, it is necessary to advance the thirdreclosure by at least the same amount.

In similar fashion, intermediate lockout must occur atleast 10 seconds prior to the start position so thatfinal synchro-check reclosure will not leave the Y unitin the latched position. A #5 cam screw must beadded to reset the Y unit as already mentioned andmust clear the latch arm before the drum reaches thefinal lockout position.

The other factory cam settings are satisfactory. Incertain styles of the RC relay, cam setting changessimilar to those just described may already havebeen made.

3.8. INSTANTANEOUS RECLOSE OPERATION

Assume a high speed trip for a line fault. This ener-gizes the SX operating coil which is in series with thetrip coil 52T. The SX contact along with the closedY13 and 14 contacts essentially bypass the #3 con-tact reclosing circuit to initiate immediate reclosing.At the same time the X-Y anti-pump circuit is ener-gized in the conventional manner, picking up the Yunit, opening the Y5 contact to prevent more thanone reclosing impulse. In addition, the operation ofthe anti-pump circuit results in the opening of the Y13contact. By the time the Y13 opens, the breakerclose circuit should be sealed by a 52X contact orequivalent. If the close circuit does not have a sealaround Y13 and 14 initiating contact, an internaljumper should be added around the Y13 contact toprevent premature de-energization of the breakerclose circuit. Whether Y13 is jumpered or not, theinstantaneous reclose circuit is opened soon afterthe drum moves off the start position since the 14contact opens at about the 3 second point.

3.9. TIMED RECLOSE OPERATIONS

At 7 seconds a #5 cam screw will reset the Y unit,setting up the circuits for the next reclose try. At 15seconds, if the bus or the line is dead with the otherside hot or if both sides are energized and in syn-chronism, a reclose will occur should the first reclosebe unsuccessful. In any case, the drum will continueto rotate and with the breaker open a similar reclosewill occur at 40 seconds if allowed by the CVX orCVE relay or the voltage units. The drum continuesto rotate with the breaker open until 48 seconds. Ifthe breaker is open at this point, the #4 contact clo-sure energizes SG relay 79-4X which sets up the RCfor a synchronism check reclose whenever the line isrestored. The motor continues to run until 50 sec-onds, then the #3 contact closes. The #3 contactenergizes the 79-4Y break contact, then stops themotor. The #3 contact also completes the circuitthrough the CVX or CVE unit contact so that reclos-ing will take place when synchronism occurs. The 79-4X break contact in series with the bus and line volt-age contacts V1 and V2 prevents reclosing at thispoint for any condition other than synchronism. A 79-4Y contact, connected to an external delay timer, canbe used to alarm for this intermediate lockout state.

After the permanent fault is removed from the lineand the line is energized from the remote station, thelocal breaker will close automatically if the line andthe bus voltages are in synchronism. This featureeliminates the need for manual restoration at the endof the line protected by this scheme following a per-manent fault. After reclosure the 52b contact con-nected to the negative bus de-energizes the 79-4Xand 79-4Y relays so that the motor can be re-ener-gized. The RC then returns to the start position.

If the reserved-synchronism-check reclose at 50 sec-onds is unsuccessful, the motor moves towards thefinal lockout position since Y5 de-energizes 89-4Xand subsequently 79-4Y. The #4 contact opens atapproximately 52 seconds; thus when the #5 camscrew resets Y at about 54 seconds 79-4X is notimmediately re-energized by Y-5. An additional #4contact closure just before final lockout allows 79-4Xto be re-energized; a 79-4X contact with externaldelay timer can provide final lockout alarm. 79-4Y isnot energized now since #3 contact opened at about52 seconds, so the motor continues to run to the finallockout position under #1 contact supervision.

5

41-661.1B

3.10. OPERATION FOR A TRANSIENT FAULT

If the fault has been cleared and reclosing successfulprior to the 48 second point the 79-4X unit cannot beenergized by the #4 contact due to the open 52b con-tact, so the motor continues to run through this pointto the start position. If the fault is not cleared by highspeed relays so that no immediate reclosure occursthe motor will still run to the 15 second point andbeyond to provide the voltage or synchronism checkreclosures.

3.11. MOTOR-SUPPLY TRANSFER

Where a reliable ac source is not otherwise availableor to avoid the need for an inverter, connect the RCmotor to bus/line potential. Then the V1 and V2 volt-age units already available for supervising reclosuremay be utilized as shown in Figure 9 to transfer themotor to line side potential upon loss of bus voltage.

3.12. MODIFICATIONS FOR OTHER FEATURES

The relay circuits are sufficiently flexible that any ofthe above features may be eliminated or modified tosuit the individual operational needs. For example,the voltage units may be reconnected or discon-nected to set up other voltage logic. Also, synchro-nism-check reclosing may be eliminated or utilizedonly on the second and third reclose, with the inter-mediate lockout feature eliminated. Alternatively, theselective reclosing feature may be eliminated and animmediate unsupervised reclose can be initiatedthrough the #14 contact; or the immediate reclosemay be initiated by the 33 contact through the syn-chronism check or voltage circuits.

4.0 CHARACTERISTICSThe standard rating for the relay is:

Motor . . . . . . . . . . . . . . . . . . . . . 120/240 V, 60 Hz

X and Y units. . . . . . . . . . . . . . . 120/240 V, 60 Hz or 48/125 Vdc

Z Unit (when used) . . . . . . . . . . 125 Vdc

Drum Speeds . . . . . . . . . . . . . . 60-90-180-360Sec./Rev.

When the motor is to be operated at 240 volts aresistor in the bottom right side is connected in serieswith the motor coil. Relays are available for operationon 50 hertz. X and Y units can be supplied for a mini-mum rating of 24 volts dc, or with a 250 volt rating.

4.1. BURDEN DATA

The maximum burdens for the various units of thestandard RC relay when energized from a120 V. 60cycle supply are listed below:

Contactor Unit (Device 79X)Open position. . . . . . . . . . . . . 49 VAClosed position . . . . . . . . . . . 33 VA

Solenoid Unit (Device 79Y)Open position. . . . . . . . . . . . . 151 VAClosed position . . . . . . . . . . . 84 VA

Synch, Motor Device 79M) . . . . . . 8.5 VA

Auxiliary Unit (Device 79Z)When usedClosed position . . . . . . . . . . . 10.5 VA at 120 V. . . . . . . . . . . . . . . . . . . . . . . . 60 hertz. . . . . . . . . . . . . . . . . . . . . . . . 3.5 watts at. . . . . . . . . . . . . . . . . . . . . . . . 125 V dc

The burdens of the X and Y units occur only momen-tarily during the reclosing cycle but the motor is ener-gized throughout the reclosing cycle. The X and Yunits can be energized for a 1 minute period and themotor for a 15 minute period without injury. The Zunit can be energized continuously.

5.0 SETTINGS

No settings are necessary unless factory settings donot meet the application requirements. The factorysettings are for three reclosures; immediate, 15 and45 seconds, with a drum revolution in 60 seconds.Contact #4 is set to close in the lockout position.Contact #14 is set to close in the start position forinstantaneous trip lockout after the first reclosure.The standard relay is shipped with the X and Y coiland motor coil resistors connected. With these con-nections the X and Y coils may be used at 125 voltsdc or 240 volts ac; the motor, at 240 volts ac.

5.1. COIL RESISTOR RECONNECTION

If the X and Y coils of the standard relay are to beused in 48 volts dc or 120 volts ac, the X and Y coilresistor must be bypassed. If the motor is to be ener-gized at 120 volts ac, the motor coil resistor must bebypassed.

6

41-661.1B

5.2. DRUM SPEED

To change the drum speed, loosen the clampingscrew at the edge of the drum speed dial, depressthe push rod on the drum, and rotate the motor andgear assembly to the desired speed position, bypushing on one or more of the posts between themotor and gear mounting plates. Then tighten theclamping screw. Select the fastest drum speed whichwill accommodate the desired reclose timing.

5.3. RECLOSE SEQUENCE

The #3 cam springs (which initiate reclosing) can beset at any point from the start position, to the 50thscale division, by loosening the cam spring screwand sliding the cam to the desired position. The camsmay not be spaced closer than 10 scale divisions. If acloser spacing is used there is not sufficient time toopen the #3 contact and then unlatch the Y unit.Thus, the maximum number of reclosures is six atthe 0, 10, 20, 30, 40 and 50 scale division points. Acam spring may not be placed past the 50th scaledivision. Otherwise insufficient time is available toallow the Y unit to unlatch and #5 cam screw to travelclear of the latch before the lockout position. A thinheaded screw is located in the #3 groove near thestart position. This screw acts as a stop to prevent a#3 cam spring setting which would close the #3 con-tact with the drum in the locked position.

After the #3 cam springs have been set, the #5 camscrews must be located to unlatch the Y unit aftereach #3 contact closure. The #5 screws should notrotate the Y unit latch arm until the #3 contact hasopened. In addition, the #5 cam screws must beclear of the Y unit latch arm before the next #3 con-tact closure.

Hardware is shipped with each relay to provide addi-tional cams for applications requiring more camsthan are used with the factory settings.

If the circuit breaker does not have a latch checkswitch, reclosing should be delayed by use of theY6 contact either to directly energize the closecircuit, or to energize an external auxiliary relay.

Using the Y6 contact will delay reclosing about 2

cycles after 52bb contact closes with X and Y

energized by ac voltage; 4 cycles, with X and Y

energized by dc voltage.

6.0 INSTALLATION

The relays should be mounted on switchboard pan-

els or their equivalent in a location free from dirt,

moisture, excessive vibration and heat. Mount the

relay vertically by means of the rear mounting stud or

studs for the type FT projection case or by means of

the four mounting holes on the flange of the semi-

flush type FT case. Either the stud or the mounting

screws may be utilized for grounding the relay. Exter-

nal toothed washers are provided for use in the loca-

tions shown on the outline and drilling plan to

facilitate making a good electrical connection

between the relay case, its mounting screws or

studs, and the relay panel. Ground Wires should be

affixed to the mounting screws or studs as required

for poorly grounded or insulating panels. Other elec-

trical connections may be made directly to the termi-

nals by means of screws for steel panel mounting or

to the terminal stud furnished with the relay for thick

panel mounting. The terminal stud may be easily

removed or inserted by locking two nuts on the stud

and then turning the proper nut with a wrench.

For detail information of the FT case refer to I.L. 41-

076.

7.0 ADJUSTMENTS AND MAINTENANCE

The proper adjustments to insure correct operation of

this relay have been made at the factory. Readjust-

ment after receipt by the customer will be necessary

only as required by the reclosing cycle requirements

and the supply voltages of a particular application as

described under “Section 5, Settings.” In reassem-

bling the relay after repairs, or in checking the adjust-

ments at regular maintenance periods, the

instructions below should be followed.

! CAUTION

7

41-661.1B

7.1. Routine Check

The factory settings of the standard relay are:

Coil Resistors in series with X and Y, and motor

X and Y Rating 125 volts dc/240 volts ac

Motor Rating 240 volts 60 cycles

Motor Speed 1 revolution in 60 seconds

Control Settings See Figure 5

The following checks may be performed to determine

if the relay, as received from the factory, is in

serviceable condition.

Energize the X and Y coils with 50% of the above ac

ratings (or 80% of the dc rating). The lower ratings

may be used by bypassing the coil resistor or

resistors. Energize the motor coil and the Z coil, if

used, at 80% of rating. See that X and Y pick up

positively and that proper contact action is obtained.

The correct adjustment of the X unit is as follows: Set

the distance from the front end of the armature mold

to the metal yoke to 9/16”. Set the X8 contact gap at

3/32” and the X9 gap at 5/32”. With the above

adjustment X9 should have a minimum of 1/32”

contact follow. Y unit contact action should be as

detailed under the section, “2. Construction”.

Determine the time required for one drum revolution.

The time in seconds should correspond to the drum

speed dial marking ±3.5%. Observe drum cam action

during this interval or by manually rotating the drum

with the push rod depressed.

7.2. ROUTINE MAINTENANCE

All contacts should be periodically cleaned with a finefile. A contact burnisher S#182A836H01 is recom-mended for this purpose. The use of abrasive mate-rial for cleaning contacts is not recommended,because of the danger of embedding small particlesin the face of the soft silver and thus impairing thecontact.

7.3. MOTOR LUBRICATION

The motor bearing contains a supply of special lubri-cant sufficient for three to five years service. Thislubricant does not congeal at low temperatures andpermits satisfactory operation of the motor at ambi-ent temperatures of 30°F to -40°F, such as some-times may occur in outdoor installations. This oil isavailable in 1/4 ounce bottles as S#1724231.

To lubricate the motor, withdraw the drum speed dialassembly after removing the clamping screw and theblack screws. Then, gently work the motor and gearassembly loose from the rear chassis mounting plateand lower it under the front chassis mounting plate.(When used, the Z unit must be removed.) Removethe gear plate of the motor and gear assembly and,then, the knurled oil cap. Saturate the wool withS#1724231 oil. Reassemble.

8.0 RENEWAL PARTS

Repair work can be done most satisfactorily at thefactory. However, interchangeable parts can be fur-nished to the customers who are equipped for doingrepair work. When ordering parts, always give thecomplete nameplate data.

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41-661.1B

9

Figure 1. Type RC Relay, without Z Unit, without Case

41-661.1B

10

Figure 2. Internal Schematic of the RC Relay, without Z Unit, in Type FT-32 Case

* Denotes Change

Sub 53536A64

41-661.1B

11

Figure 3. Internal Schematic of the RC Relay, with Z Unit, in Type FT-32 Case

* Sub 53536A66

* Denotes Change

41-661.1B

12

Figure 4. Cam and Y Unit Contact Positions

41-661.1B

13

Figure 5. Contact Position Development – One Immediate and Two Time Delay Reclosures. Heavy Line Indicates Contact Closed or Coil Energized. One Revolution in 60 Seconds. Permanent Fault. Instantaneous Trip Lockout After First Reclosure

Sub 4288B843

41-661.1B

14

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41-661.1B

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41-661.1B

16

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41-661.1B

17

Figure 9. External Schematic for RC Relay with CVE-1 Synchro-Verifier Relay, Intermediate Lockout and Alarms

* Sub 6408C823First of 2 parts

* Denotes Change

41-661.1B

18

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41-661.1B

19

Figure 11. Internal Schematic of the RC Relay, with Z Unit, and #3 Contact Connected in Terminals, in Type FT-32 Case

* Sub 5188A184

* Denotes Change