GEK-49826D

INSTRUCTIONS

INSTANTANEOUS OVERCURRENT RELAYS

TYPES:

HFC21B, HFC22B, HFC23C

GE Protection and Control205 Great Valley ParkwayMalvern, PA 19355-1337

GEK-49826

CONTENTSPAGE

3DESCRIPT IONAPPL ICATIONCONSTRUCTIONRATINGS

CONTACTSBURDENSCHARACTERIST ICSRECEIV ING, HANDLING AND STORAGEACCEPTANCE TESTS

GENERALVISUAL INSPECTIONMECHANICAL INSPECTIONDRAWOUT RELAYS, GENERALPOWER REQUIREMENTS, GENERALH I -SEISMIC INSTANTANEOUS UNIT

INSTALLATIONINSTALLATION TESTS

PERIODIC CHECKS AND ROUTINE MAINTENANCECONTACT CLEANINGCOVER CLEANINGSYSTEM TEST

SERVIC INGHI -SEISMIC INSTANTANEOUS UNIT

RENEWAL PARTSL IST OF FIGURES

3445556667777888999999

1011

( Cove r Pho to 8043211 )

2

GEK-49826

INSTANTANEOUS OVERCURRENT RELAYS

TYPES:

HFCC21B, HFC22B, HFC23 C

DESCRIPTION

The Type HFC relays covered by this instruction book consist of one or more hingedarmature instantaneous overcurrent units,contacts, assembled in a type Cl single end drawout case.rating and are identified by the letters "Hi-G" molded into the target block,unit includes a target button, which is raised into view and latched, when the unitpicks up. The targets are manually reset by a button on the front of the relay

The various relay types differ only in the number of units included in the case,as tabulated below:

each with two electrically separateThe units have a hi-seismic

Each

cover.

RELAY TYPE NUMBER OF UNITS

HFC21BHFC22BHFC23C

123

APPLICATION

The Type HFC relays are generally applied where a direct trip instantaneousovercurrent function is required. Typical applications are on transmission lines tosupplement existing distance relays, or pilot schemes, with instantaneous overcurrentrelays set to detect severe close-in faults; or in the distribution area, incombination with time overcurrent relays, and an automatic reclosing scheme, to providecoordination with branch fuses,instantaneous units in these applications, their transient overreach characteristic(shown in Figure 7) must be considered. The percent transient overreach must beapplied to proportionately increase the calculated pickup setting so that theinstantaneous units will not overreach a downstream device, thereby causing loss ofcoordination in the system protection scheme.

When determining the pickup setting of the

The Type HFC21B can be applied with a doughnut-type current transformer encirclingthe three phase conductors (ground sensor scheme), to provide sensitive ground faultprotection.

These instructions do not purport to cover all details or variations in equipment nor to provide forevery possible contingency to be met in connection with installation, operation or maintenance,further information be desired or should particular problems arise which are not covered sufficiently forthe purchaser's purposes, the matter should be referred to the General Electric Company.

To the extent required the products described herein meet applicable ANSI,but no such assurance is given with respect to local codes and ordinances because they vary greatly.

Should

IEEE and NEMA standards;

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GEK-49826

The Type HFC23C re lay can be used to provide d i f fe ren t ia l pro tec t ion of a motor ,usua l ly by means of the se l f -ba lancd pr imary cur ren t scheme shown in Figure 6.the cur ren t t ransformers mounted a t the machine te rmina ls , as ind ica ted in th i s f igure,the cables be tween the c i rcu i t breaker and the machine are not inc luded in thed i f fe ren t ia l zone. Therefore , the swi tchgear equipment should inc lude some form ofovercur ren t re lay ing , opera t ing from curren t t ransformers loca ted a t the c i rcu i tbreakers , for pro tec t ion of these cables.

With

CONSTRUCTION

The Type HFC re lays cons is t of a molded case, cover , suppor t s t ruc ture assemblyand a connec t ion plug to make up the e lec t r ica l connec t ion. See cover f igure, andFigures 1, 2 and 12.

The drawout connec t ion / tes t sys tem for the Cl case, shown in Figure 11, hasprovis ions for 14 connec t ion poin ts , and a v is ib le CT shor t ing bar loca ted in thef ron t. As the connec t ion plug i s wi thdrawn , i t c lears the shor te r contac t brushes inthe output contac t c i rcu i t s f i r s t. Thus , the t r ip c i rcu i t i s opened before any o therc i rcu i t s are disconnec ted. Next , the cur ren t c i rcu i t brushes on the case connec t ionblock engage the shor t ing bar ( loca ted a t the lower f ron t of the case ) to shor t c i rc i tex te rna l cur ren t t ransformer secondary connec t ions. The window provides v isua lconf i rmat ion of CT shor t ing. The connec t ion plug then c lears the cur ren t c i rcu i tcontac t brushes on the case, and f ina l ly those on the re lay suppor t s t ruc ture, tocomple te ly de-energ ize the drawout e lement.

The ins tan taneous uni t i s a smal l h inged or armature type uni t , wi th twoe lec t r ica l ly separa te contac ts mounted on the suppor t s t ruc ture,

ins tan taneous uni t p icks up, i t ra i ses a ta rge t which la tches up and remains exposedunt i l i t i s re leased by press ing a but ton , loca ted on the upper le f t s ide of the cover.

The ins tan taneous uni t has the le t te rs "Hi -G" molded in to the ta rge t b lock todis t inguish i t as a h i-se i smic uni t. The se i smic f rag i l i ty leve l exceeds peak ax ia lacce le ra t ion of 10 g ' s ( 4 g ZPA ) when tes ted us ing a b iax ia l mul t i -f requency inputmot ion to produce a requi red response spec t ra ( RRS ) in accordance wi th the Standard forSeismic Tes t ing of Relays, ANSI 37 .98-1978.

When the

RATINGS

The re lays are des igned for opera t ion in an ambient a i r tempera tures f rom minus20°C to plus 55°C. Ranges a re shown in Table 1.

TABLE 1

Curren t Range( Amperes )

Frequency( Her tz )Relay

HFC 21BHFC22 BHFC23C

50/60 0 .5-4 and 2-50

4

GEK-49826

The instantaneous units have a tapped coil for operation on either one or tworanges, HIGH ( H) or LOW ( L ) . Selection of the HIGH or LOW range is determined by theposition of the link located on the top of the support structure ( see Figure 1 andTable 2).

TABLE 2

***0ne SecondRating( Amps )

Hi-SeismicInstantaneousUnit ( Amps )

ContinuousRating( Amps )

LinkPosition

**Range( Amps ) K

0.5 - 2 0.75L 8,836940.5 - 4 1.5H 2 4

10 3.72L 16,9001302 - 50 10 - 50H 7.5

**The range is approximate, which means that the 2-10 amp range may be 2-8amps, and the 10-50 amp range may be 8-50 amps. There will always be at leastone ampere overlap between the maximum L setting and the minimum H setting.Always select the higher range whenever possible, since it has a highercontinuous rating.

***Higher currents may be applied for shorter lengths of time in accordance withthe formula:

I = /KTFCONTACTS

The contacts will carry 30 amperes trip current.

BURDENS

The hi-seismic instantaneous unit burdens are listed in Table 3.

CHARACTERISTICS

The instantaneous units have either a 25 to 1 or an 8 to 1 range with a tappedcoil. There are high and low ranges, selected by means of links located on the top ofthe support structure ( see Figure 1) . The time current curve for the instantaneousunits is shown in Figure 8.

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GEK-49826

TABLE 3

Burden in Ohms ( Z )Times Pickup

Hi-SeismicInst. Uni t

( Amps )

Burden at MinimumPickup (Ohms )

MinimumPickup( Amps )

L inkPosi t ion

Range( Amps ) JX 10 20Hz R Z 3

10.63 9.81 8.56 7.80L 0.5 - 22 - 4

14.440.5 9.770.5-4 60 4.18H 6.21 4.265.13 4.662 3.49

0.4800.071

0.4570.070

2 - 1010 - 50

0.6340.072

L 2 0.7500.070

0.6500.024

0.9920.0742-50 60 H 10

7.13 6.508.18L 0.5 - 22 - 4

8.14 12.030.5 8.860.5-4 50 3.483.55H 2.91 5.18 3.884.282

0.3800.058

0.4000.059

0.5280.060

L 2 - 1010 - 50

0.8270.062

2 0.6250.058

0.5420.0202-50 50 H 10

RECEIVING, HANDLING AND STORAGE

These re lays, when not inc luded as par t of a contro l panel wi l l be shipped incar tons designed to protect them against damage. Immediate ly upon receipt of a re lay,examine i t for any damage susta ined in t ransi t,handl ing is evident, f i le a damage c la im at once wi th the transportat ion company andprompt ly not i fy the nearest General E lect r ic Apparatus Sales Off ice.

Reasonable care should be exerc ised in unpacking the re lay in order that none ofthe par ts are damaged or the adjustments dis turbed.

I f the re lays are not to be insta l led immediate ly, they should be stored in thei ror ig inal car tons in a place that is f ree from moisture, dust and metal l ic chips.Foreign matter col lected on the outs ide of the case may f ind i ts way ins ide when thecover is removed, and cause t rouble in the operat ion of the re lay.

I f damage resul t ing from rough

ACCEPTANCE TESTS

GENERAL

The re lay should be examined and tested upon del ivery to ensure that no damage hasbeen susta ined in shipment and that the re lay cal ibrat ions have not been dis turbed,examinat ion or test indicates that a readjustment is necessary, refer to the sect ion onSERVICING.

I f

6

GEK-49826

The following tests may be performed as part of the installation of the relay atthe discretion of the user. Since most operating companies use different proceduresfor acceptance and installation tests, the following section includes all applicabletests that may be performed on the relays.VISUAL INSPECTION

Check the nameplate stamping to ensure that the model number and rating of therelay agree with the requisition.

Remove the relay from its case and check that there are no broken or crackedmolded parts or other signs of physical damage, and that all the screws are tight.MECHANICAL INSPECTION

The armature and contacts of the instantaneous unit should move freely whenoperated by hand. There should be at least 1/64- inch wipe on the instantaneouscontacts.

1.

The target in the instantaneous unit must come into view and latch when thearmature is operated by hand, and should unlatch when the target release button isoperated.

2 .

Make sure that the brushes and shorting bars agree with the internal connectionsdiagram.

3.

If there is a need to tighten any screws, DO NOT OVERTIGHTEN. Overtighteningmay cause stripping.CAUTION:

DRAWOUT RELAYS, GENERAL

The HFC relays may be tested without removing them from the panel by using the12XCA11A1 four-point test probes. These test probes make connections to both the relayand the external circuitry, which provides maximum flexibility, but requiresreasonable care in use, since a CT shorting jumper is necessary when testing. The CTcircuit may also be tested by using an ammeter with the 12XCA11A2. See the test circuitof Figure 9.

Figure 9 shows test connections for the HFC21B current transformer, and theleft unit current transformer of the HFC22B and HFC23C. To test the CTs ofthe HFC22B and HFC23C, refer to internal connections shown in Figures 4 and5, respectively.

NOTE:

POWER REQUIREMENTS, GENERAL

Since non-sinusoidal waveforms can be analyzed as a fundamental frequency plus harmonics of thefundamental frequency, it follows that alternating current devices (relays) will beaffected by the applied waveform.

All alternating current operated devices are affected by frequency.

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GEK-49826

Therefore, in order to properly test alternating current relays it is essential touse a sine wave current and/or voltage. The purity of the sine wave (i.e., its freedomfrom harmonics ) cannot be expressed as a finite number for any particular relay;however, any relay using tuned circuits, R-L or RC networks or saturatingelectromagnets ( such as time overcurrent relays), would be essentially affected by non-sinusoidal waveforms. Hence a resistance- limited circuit, as shown in Figure 10, isrecommended.HI-SEISMIC INSTANTANEOUS UNIT

Make sure that the instantaneous unit link is in the correct position for therange in which it is to operate. Use the higher range whenever possible, since thehigher range has a higher continuous rating. Test connections for testing pickup andoperating times are shown in Figure 10.

Figure 10 shows test connections for the HFC21B and the left unit of theHFC22B and HFC23C. To test the other units of the HFC22B and HFC23C, referto internal connections shown in Figures 4 and 5, respectively.

Setting the Hi-Seismic Instantaneous Unit

NOTE:

The instantaneous unit has an adjustable core located at the top of the unit asshown in Figure 1. To set the instantaneous unit to a desired pickup, loosen thelocknut and adjust the core. Turning the core clockwise decreases the pickup; turningit counterclockwise increases the pickup. Bring up the current slowly until the unitpicks up. It may be necessary to repeat this operation until the desired pickup valueis obtained. Once the desired pickup value is reached, tighten the locknut.

REFER TO TABLE 2 FOR THE CONTINUOUS AND ONE SECOND RATINGS OF THEINSTANTANEOUS UNIT. DO NOT EXCEED THESE RATINGS WHEN APPLYING CURRENT TO THEINSTANTANEOUS UNIT.

CAUTION:

The range of the instantaneous unit ( see Table 2 ) must be obtained between a coreposition of one-eighth of a turn fully clockwise, and 20 turns counterclockwise fromthe fully clockwise position. Do not leave the core in the fully clockwise position.

INSTALLATION

The relay should be installed in a location that is clean, dry, free from dust,and well lighted to facilitate inspection and testing.

The relay should be mounted on a vertical surface. The outline and panel drillingdimensions are shown in Figures 12 and 13. Figure 12 shows semi- flush mounting, andFigure 13 shows various methods of surface mounting.

The internal connections diagrams for the relays are shown in Figures 3, 4 and 5.INSTALLATION TESTS

The following tests are to be performed at the time of installation:

8

GEK-49826

Hi -Seismic Instantaneous Unit

Select the desired range by setting the link in the proper position ( seeFigure 1 and the internal connections diagram). Always select the higherrange whenever possible, since it has a higher continuous rating.Set the instantaneous unit to pick up at the desired current level. See"Setting the Instantaneous Unit" in the ACCEPTANCE TESTS section.

All the tests described under INSTALLATION must be performed at the time ofinstallation. In addition, if those test described under the ACCEPTANCE TESTS sectionwere not performed prior to installation, it is recommended that they be performed atthis time.

1.

2 ,

PERIODIC CHECKS AND ROUTINE MAINTENANCE

In view of the vital role of protective relays in the operation of a power system,it is important that a periodic test program be followed,periodic checks will vary depending upon environment, type of relay and the user ' sexperience with periodic testing. Until the user has accumulated enough experience toselect the test interval best suited to his individual requirements, it is suggestedthat the points listed below be checked at an interval of from one to two years.

The interval between

CONTACT CLEANING

A flexible burnishing tool should be used for cleaning relay contacts. This is aflexible strip of metal with an etched-roughened surface, which in effect resembles asuperfine file. The polishing action of this file is so delicate that no scratches areleft on the contacts, yet it cleans off any corrosion thoroughly and rapidly,flexibility of the tool insures the cleaning of the actual points of contact. Do notuse knives, files, abrasive paper or cloth of any kind to clean relay contacts.

The

COVER CLEANING

Lexar^ cover should be cleaned with a soft cloth and water only.Use of cleaning solutions other than water may

NoThe clearcleaning solutions should be used,damage the clear cover.SYSTEM TEST

Although this instruction book is intended primarily to check and set the HFCrelay, overall functional tests to check the system' s operation are recommended atintervals based on the customer ' s experience.

SERVICING

HI-SEISMIC INSTANTANEOUS UNIT

Both contacts should close at the same time.1.

© Registered trademark of the General Electric Co.9

GEK-49826

With the armature against the pole piece, there should be at least 1/64-inch wipe on the contacts. Check this by inserting a 0.010 inch feelergage between the front half of the shaded pole with the armature heldclosed. Contacts should close with the feeler gage in place,mechanical adjustments may affect the seismic fragility level , it isadvised that no mechanical adjustments be made if seismic capability is ofconcern.

2.

Since

RENEWAL PARTS

Sufficient quantities of renewal parts should be kept in stock for the promptreplacement of any that are worn, broken or damaged.

When ordering renewal parts, address the nearest Sales Office of the GeneralElectric Company. Specify the name of the part wanted , quantity required, andcomplete nameplate data, including the serial number, of the relay.

Since the last edition, Figures 12 and 13 have been changed.

10

GEK-49826

L I S T O F F I G U R E S

PAGEFIGURE

12Type HFC 23B Re lay Removed f rom Case, Fron t View

Type HFC23B Re lay Removed f rom Case, Rear View

In te rna l Connec t ions fo r Type HFC21BRelay, Fron t View

In te rna l Connec t ions fo r Type HFC22BRe lay, Fron t View

1

122

313

414

5 In te rna l Connec t ions fo r Type HFC23CRe lay, Fron t View 15

Exte rna l Connec t ions fo r Type HFC23C ,Se l f -Ba lanc ing Pr imary Cur ren tDi f fe ren t i a l Scheme fo r Motor P ro tec t ion

6

16

Trans ien t Over reach Charac te r i s t i c sof the Hi -Se i smic Ins tan taneous Uni t

717

Time-Cur ren t Charac te r i s t i c sof the Hi -Ses imic Ins tan taneous Uni t

818

Tes t Connec t ions fo r Tes t ing Cur ren tTrans fo rmer Secondary Used wi th the HFC Relay

919

10 Tes t Connec t ions fo r Tes t ing Pickup andOpera t ing Times of the Type HFC Re layHi -Se i smic Ins tan taneous Uni t 20

11 Cross Sec t ion of Type HFC Drawout CaseShowing Shor t ing Bar

Out l ine and Pane l Dr i l l ing fo r Type HFC Re lay

Out l ine and Pane l Dr i l l ing fo r Type HFC Re lay

21

12 22

13 23

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GEK-49826

RANGE SELECTIONLINKS

INSTANTANEOUSUNIT ADJUSTABLECORE

INSTANTANEOUSUNIT TARGET

Figure 1 (8043212) Type HFC23B Relay, Removed From Case, Front View

RANGE SELECTION LINKS

INSTANTANEOUSUNIT ADJUSTABLECORETARGET RESETMECHANISM

SUPPORTSTRUCTURE

Figure 2 (8043213) Type HFC23B Relay, Removed from Case, Rear View

12

GEK-49826

INSTANTANEOUS INST.BT

Eo CUDL H

\J/ v vVV V V ~v* *V V

V Y*o o02 4 6

oo o1 3 5

INST. SETTINGSET LINK TO "Hv'FOR HIGH RANGEAND TO"L" FORLOW RANGE.LINK SHOWN INHIGH RANGEPOSITION.

*-= SHORT FINGERS

Figure 3 (0269A3074-0 ) Type HFC21B Internal Connections Diagram, Front View

13

GEK-49826

I NSTANTANEOIJSUNITSRIGHT \\n

RIGHTINST.LEFT

INST.B BLEFT TT

E E .

o o~o C p DV \ /L H HLV V

* V v v vv~ —v\j/V V

*o o o o2 4 106

c oo o1 3 5 9INST. SETTINGS

SET LINK TO "Hft FOR HIGH RANGEAND TO " L " FOR LOW RANGE.LINK SHOWN IN HIGH RANGE POSITION.

= SHORT FINGERS

Figure 4 (0275A1900-0) Type HFC228 Internal Connections Diagram, Front View

14

GEK-49826

INSTANTANEOUSUNITS

RIGHT

LEFTINST. MIDDLE

INST. RIGHTINST.

MIDDLE

B B BLEFT

T TTE E E

o at) O QD oat)H LL H L H

V V. v V —V v —- v v—vV V-

8 1042 6 120 o o o oo

3 5 7 9 I IINSTANTANEOUS SETTINGSSET LINK TO "H‘ FOR HIGH RANGEAND TO'vL" FOR LOW RANGE.LINK SHOWN IN HIGH RANGE POSITION.

Figure 5 ( 0285A6295-0) Internal Connections for Rel ay Type HFC23C, Front View

15

GEK-49826

BUS87-HFC 23C52- CIRCUIT BREAKER

2 3I11 I

52

877. 8-^v—I I. 1 2— —r-

£;E“1{+) ALARM BUS <+> TRIP BUS

6 t3<N0TE I) (NOTE I )4

MOTOR d=Q_7 4r67 riz87 ^87 -Lg2 -1-87

2 5

-1- 52aTO ALARM

NOTE LAS AN OPTION, CONNECTING STUD 3TO (+) ALARM BUS WILL PROVIDE AN ALARMWHEN RELAY CONNECTION PLUG IS REMOVED.DO NOT USE THIS KIND OF CONNECTION ONTHE TRIP CIRCUIT SINCE A FALSE TRIPWOULD OCCUR.

TC

(-)

Figure 6 ( 0285A7123-0) External Connections for Type HFC23C, SelfBalancingPrimary Current Differential Scheme for Motor Protection

16

HI SEISUC RATED INSTANTANEOUS UNITTRANSIENT OVERREACH

~ncoc

A = PICKUP CURRENT GRADUALLY APPLI EDB « CURRENT SUDDBJLY APPLIED

PERCENT OVERREACH - 100-sfD

50orv>oo

“*> CO

5- ^IE 4^ MOS— ii roco —" o

ctft) LUQ.“500 QJ3 GDm00o 7*9H-H CO

Z5 130 0 r t-

4*3o ( HI-SEISMIC)MINIMUMPICK-UP

\l VOI 00

sfn- 5noU J Oi>O

”S13 fDfD QJO OC £0zrl/><Dcz

rs D)

r+ OJOr+fD

5̂ 1000<-t-

MAXIMUMPICK-UP

(HI -SEISMIC)

oC/>

T 9310 600 uo 5030 807620ANGLE IN DEGREES LAG

GEK-49826

o

o>

CO

CLO

5 UCD

CLCO

§ u_o

3 (/)Ui

3 £ CL

to *“ to

1— o

i s&o

5LUiO

CO

cu

in

<

tnuD§ oLD 8CM Q ooS0N003S Nl 3Wli dfDOId

Figure 8 ( 0208A8695-1) Time-Current Characteristicsof the Hi-Seismic Instantaneous Unit

18

GEK-49826

R E L A Y C O I LN O T I N C I R C U I TR E L A Y C O I L

I N C I R C U I T

5 R E L A YT E R M I N A L S

6

R E L A YS I D EC A S ES I D E

R E L A YS I D E

C A SE“

S I D EA5

I2X G A I I A I6

— I2 X C A I I A IOR 5 6

1 2 X C A I I A 2A

T E S T C O N N E C T I O N S F O R T E S T I N G G TS E C O N D A R Y U S E D W I T H T H E I F C R E L A Y

Figure 9 ( 0269A1787-1) Test Connections for Testing CurrentTransformer Secondary Used with the Type HFC Relay

19

GEK-49826

TO STARTTIMER4\ A VARIABLE

RESISTOR7

erfoMINIMUMRECOMMENDEDVOLTS, 120 ATRATED FREQ.

7III

<y^oTO STOPTIMER/J\ /N TO INDICATINGI I- L I G H T WHEN

CHECKING PICKUP

RELAYTERMINALS-! 2 3 4 5 6

o o oo oo

RELAYSIDECASE

”

SIDE

RELAYSIDECASE

" '

SIDE

RELAYSIDE _CASE

-

SIDE12 XCA11A1 —^ o o oo 9eo 5

CTJUMPER

TEST CONNECTIONS FOR TESTING PICKUP ANDOPERATING TIMES OF THE HFC RELAY INSTAN-TANEOUS UNIT WITH ELECTRICALLY SEPARATECONTACTS.

Figure 10 (0275A1904-0) Test Connections for Testing Pickup andOperating Times of Type HFC Relay Hi -Seismic Instantaneous Unit

20

GEK-49826

DRAWOUT ELEMENTSUPPORT STRUCTURECONTACT FINGERSCONNECTION PLUG

WINDOW

RELAY CASE

CASE CONNECTION BLOCKSHORTING BAR

Figure 11 (8042715 ) Cross-Section of Type HFC Relay Drawout CaseShowing Shorting Bar

21

GEK-49826

STUD NUMBERING

(6 oo tREljAY t7.376 6.124f 156MM187MM it jololololololol

|o|o|olo|o|o|o|3.06278MMt3.688

94MM 113

Li 0) ID O3.031 2.78177MM 71MM

5.5626.062154MM 141MM

REAR VIEWFRONT VIEW1.312 SEE VIEW ”D”33MM .188 DRILL5.1247.000

5MM178MMSEE VIEW “A”

130MM (4 HLS.)2.562\ 65MMoI *\ )n CUTOUT6.750

171MM\ 6.188157MM1t9 * 3.094

79MMt3.37586MM

J-U <oEXTERNALCONNECTIONS10-32 SCREWS 2.844

72MM5.688

MOUNTING SURFACESIDE VIEW

144MMPANEL DRILLING

TIE SUPPORTSEMI-FLUSH MOUNTINGORPANEL

MAX .125 THK. TIE ANCHORWASHER- LOCKWASHER8-32 SCREW

r3MM ~ T 1

Ih- § 10-32 SCREWTHREADCUTTING

\= I h-r1' NUT

CABLESCABLE TIEVIEW ” D”VIEW "A"

HDW-0257A8549 G-1Figure 12 (0257A8452-1, Sh. 1 [ 6]) Outline and Panel Drilling for Type HFC Relay

22

GEK-49826

tj o o?REiAY7.376

187MM tSTUDNUMBERING , 6.124

1 156MM\? Nplplololololol

|0|0|0|.0|0|0|^|3.06278MM3.688

94MM

io£3.031 2.781

MM TMM6.062 5.562154MM

FRONT VIEW1 41MM

REAR VIEW7.563

(2) .750 HOLES19MM

192MM i .2507MMJ 2.375C UtSEE VIEW "B" 61MM

4.750 -r121MM \ £ \ 2.00051MM

CUTOUTEXTERNALCONNECTIONS10-32 SCREWS ! $

2.500 MOUNTINGSURFACE-WASHER

MOUNTING SURFACESIDE VIEW

64MM5.00128MM

PANEL DRILLINGSURFACE MOUNTING F0RN.188 (5MM) THK. MAX. PANEL LOCK WASHER. 8— 36

SCREW8.344 NUTREMOVE KNOCKOUT212MM V3.68894MM 2.375 i

61MM c OVERSIZE WASHERSVIEW ”B”\

t HDW. 0257A8549-G2)C .4697"

SEE VIEW ”C” MOUNTINGSURFACEWASHER-̂LKWASH

\ k 12MM4.750 -4o-cTc.750121MM {EXTERNAL

CONNECTIONS10-32 SCREWS

19MM-o © e ,i o o o .625

T c^w3 1WM(2) .219 HLS

5MM.625 TYP.• 16MMFOR .312

MOUNTING SURFACESIDE VIEW

NUT

l.156 HLS4MM 8MM SPACERL— REMOVE KNOCKOUT

VIEW ”C”HDW. 0257A8549 — G2

Figure 13 (0257A8452-1, Sh. 2 [ 6] ) Outline and Panel Drilling for Type HFC Relay

SURFACE MOUNTING FOR.188 (5MM) THK.AND OVER.

PANEL DRILLING

REFER TO RELAY FORQUANTITY OF HOLES.

23

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215 Anderson AvenueMarkham, OntarioCanada L6E 1B3Tel: (905) 294-6222Fax: (905) 201-2098www.ge.com/indsys/pm