Siemens-Allis LA-3200A User manual

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SIEMENS-ALLIS
Switchgear
INSTRUCTIONS
TYPES LA-3200A, LA-4000A
AND LA-40008 (UNFUSED)
AIR CIRCUIT BREAKERS
WITH
MANUAL OR ELECTRICAL
OPERATORS
18X5689-01
September, 1979
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WAHRANTY
I NS T AL LATION ANO I NSPECT IO N
ln tr oduc;t1o n .
R ecc 1vino tHHi ln sp1 ?c taon fq t Dn n, nqe
l ns ta ll <J lion .
Sw r:.i g •~ .
Ma i 11t en.ince .
OPERAT ION
D
es cri pti on
Ma nua llv · Op er3 rerl Br e ak er
El
ect r ic ally-Opera ted Br ea ke r .
Drawout I nt er l ock .
Racking Mecha n ism.
Lift i ng Bar & Ra il Ext e nsions .
Sp r ing Disc harge Int er lock .
M
AINTENANCE AND ADJ U STMENTS
Mai n te nan ce . .
Lub ri cation .
Maintenance Cl osing
Handli ng Instruc ti on
Fig. 1
Fig. 2
Fig. 3
Fig. 4
T
yp ical L A-3000A Breaker Outli ne.
Typ ical LA·30 00A - 4000A Opera t or
Typi cal Wiri ng Diag r am - El ectr i cally
Operated Br eakers ....
Typical Rack ing Mec h anism and
Drawout I nterlock
Fig. 5 Main t enance Closing
Table 1 Oper ating Procedure - Ma nu ally ·
Operated Breakers . . .. ... .
Table 2 Operat i ng P rocedure - Electrical Iy ·
Operated Breakers .
"
. 2 · L2
3
3
4
4
4
8
5
6
6. 21
6
.17
13
14
15
16
18
3
4
A<l1t 1S t !T Wr\ t$
Tr 1p - L11 t ch Enci; t CJl~f nt-! n t
Mn 1n Co 11t :1cr Mnke .
Arc 1 r1q Con 1; 1c1 Mnk ".
Contac:t R t! p lttCf!rTit! nt .
M.1 in C on t; 1cr F1 nuers .
Srn 11 on : 11 v A 1c1ng Con ta ct
H 1 nge Con tact F 1ng ers .
Mo v 11H JArr.1n <J and Mai n Co nt a ct
Tr 1pp1nq A ctuntor.
Motor Cu roff Sw it ch
Sec onda ry D isc. Opt ion .
Aux i liary Sw i tc h Option .
Shunt Tr ip Op t ion
TRIP PING TRANSFORMERS
Curr ent Se nso rs
Trippi ng Transformer Tab le
Bell A larm Sw i tc h Option
St at ic Tr ip Opt io n .
Lim iT ri p.
Undervo ltage Trip Dev ice Opt i on.
L ubr ica ti ng In structions
I nstruct ion Boo k Ref .
Fig. 6 T y pical P
anel Assembly
F ig . 7 Secondary Disconnect
Fig. 8 Auxil i ary Sw i tc h
Fi g.
9
Shunt Tr ip .
Fi g. 10 Unde r voltage Tr ip.
Fig . 11 Bell Alarm.
Tab le 3 Ma i ntena nce Cl osing
Table 4
Tr ip Rat in g Ta b le - Amperes
Static Tr ip II .
T
ab le 5 Tr ip R at i ng Table
Li mi Tr ip .
. .
7
7
7
8
8
8
8
8
8
8
9. 10
. 11
. 1 1
.11
. 11
11
. 12
. 11
. 12
12
11
21
22
19
19
19
19
. 20
. 20
i
12
i 2
T he i nfo r mation contained w i thi n is in tende c ~ o assist opera tin g pe rsonne l by p rovid i ng in formation on th e genera l ch arac te ri stics o f
equ i pment o f th is type. I t does not reliev e th e user of r espo nsi bi li ty t0 use sound engineeri ng practice -s in the i nsta ll ation, application ,
operation and main tenance of t he part icu lar equ i oment pu rchased .
If draw i ng s or o t her supplemen t ary i nst ru ctio ns for specific app l ications are forwarded w it h th is rnanua l or separately, they ta ke p recede nc e
over any co n flicti n g or i ncom p lete info r mat i on in this manua l.
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WARRAN TY
. ·Sicm<'ns-Allis "LA" air circuit lm •akPrs ar l' warrant1·d lo lw fn •c , >f (kft'<'Ls in mat. nial and workma nship for a pe ri od of
one year from datl' of in iti al <>pnation hut not mon • than 1·ighl1'c1 1 11\(>rlLhs from date· of s hipml'nl hy company . This
warranty is l imited to Lhl' furnish ing of any part. w hi ch to our s;\l i ~l'<ldinn has h!'('ll pro»· c·n dPfPcti\'l'. Si('tnl'ns-J\llis
will not in any casl' assunw r<' spons ibil ity for alliPd 1·quiprn l'nt 1if any kind. (S<'E' S i1 :nH'ns- Alli s Warranty Form
20160).
Typic al Shipping Methods Used With "LA" Breakers
II
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INSTALLATION AND INSPECT IO N
INTRODUCTION
The type "LA" air circu it breakers may be fu rn ished for mou nt ing in either of two ways. They may be
use d in metal·enclosed switchgear of the drawout type, or in individual enclosures (drawo ut type). All
"LA" breakers are co mpl ete ly asse mbled, tested, and ca libr ated at the factory in a vertical position and
must be
so installed to operate proper ly. Customer's prim ary connections sh oul d be adeq uately braced
aga inst the effects of sh ort circ uit currents to prevent overstressing the breaker terminals.
RECEIV
IN G AND INSPE CTION FOR DAMAGE
Immedia tely upon receipt of this equipm ent, caref ully remove all packing traces and examine parts, check-
ing
th em against the packing list an d noting any damages i nc urr ed in transit. If such is disclosed, carrier in-
spection
must be arranged for by consignee within 15 days of receipt of equipment . If equipment sh ipped
F
.0 .B. Shipping Point, consignee must fi le a claim with the carrier. If equipment is sh ipped F.O. B. Destina-
tion, the con signee mu st obt ain th e original of th e carrier inspection report and notify Siemens- Allis imm e-
diately.
Two ship pin g methods are us ed with "LA" breakers:
1. Individually skidded with pro t ec tive covering for domestic shipments.
2.
Within a cubicle on exp ort orders when part of a swi tchg ear lineup. Breakers shipp ed in their cubicl es
are bl ock ed to prevent acciden ta l tripping duri ng shi pm ent. Note all caution tags, remove blocking
bolts, and open breaker con tacts b efor e insta llati on.
STORAG E
Wh
en breakers ar e to be put into stora ge, they should be wrapped or covered with a non -absorbent
material
to provide protection from pl aster, concrete dust, moisture or other foreign matter_ Breakers
sh ould n ot be exposed to the acti on of cor rosive gase s or moisture. In a r.eas of hi gh humidity or tempera-
ture
fluctuations, sp ace heate rs or the equivale nt should be provided_
I
NSTAL LA TI ON
The" LA" air cir c uit breaker is com ple tely adjusted, tested, and inspected befo re shipment, but a care ful
ch ec k sh ould be made to be cert ain th at shipment or storage has not resu lted in damage or change of ad -
justm e nt . Circuit breakers should be install ed in a clean, dry, well-ven ti lated ar ea in which the atmo sp here
is free from destructive acid or alkali fumes. Before insta lling , make certain tha t the breaker contacts are in
th e open pos itio n, and primary discon nect fin gers are l ubr icated with Siemens-Allis ele ct rical contact lubr i-
cant supplied with accessories.
1. Befo re the breaker is install ed in position, make sure racking clevis' (Fig. 4) are in test or con nect
posi
tion, then cl ose it manually by the maintenance closing me thod (see MAINTENANC E AND
ADJUSTMENTS , page 6) to check proper functioning of the mechanism and contacts.
During the clos ing operation, observe that the c ontact s move freely without interference or rubbing
between movable arcing contacts and parts of the arc chutes. Then r efer to OP E RATION, page 3 for a
detailed
description of the circ uit breaker operating chara ct eristics befo re putting the breaker in
service.
2_ Trip units and accessory devices sh ould receive a thorough check prior to placing the b re aker in service
to be certain that adjustments are proper and pa rts are not dama ged . Refer to Stat ic Trip Devi ce In -
struction Book 18X 4 827 supplied with this equipment or to LimiTrip Book 18X 10107_
3. Breakers are equ ipp ed with a drawou t int er lock to prevent movement of a clos ed breaker into or out
of the connected position. See SPRING DISCHARGE INTERLOCK, page 5 for a description of the
interlock . I ts operation should be checked before the breaker is energized.
4.
Upon complet ion of the installation inspection, the c on trol wiring, if any, is check ed and the insula-
t ~ on t es ted, then the breaker is ready to be energiz ed .
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CAUTIONS TO BE OBSERVED IN THE
' STA LLATIO N AND OPERATION OF "LA" CIRCUIT BREAKERS
1. Never try to remo ve the breaker from the compartment or reinsert into the compartment without
using the guide rail extensions supplied. See page 17.
2. Read the
Instruction Book before installing or making any changes or adjustments on the breaker.
3. As the closing springs
on stored-energy breakers may be charged with the breaker contacts in either
the open or closed position, extreme care should be taken to discharge the springs before working on
the breaker.
4. When charging manually-operated breakers, always hold handle firm ly unt il it is returned to the nor mal
vertical
position .
5. Check
current ratings against single line diagram to assure that breakers are properly located in switch·
gear at instal
lation.
6. Check the alignment of the secondary disconnect fingers to ensure against misalignment due to possible
distor t ion of fingers during shipment and handling.
7. Once the breaker
is energized, it should not be touched, except for operating, since most of the com-
ponent parts are also energized.
MAINTENANCE
Occasional chec king and cleaning of the breaker will promote long and trouble -free service. A periodic in-
spection and servicing on an annual basis should be
included in the breaker maintenance routine or at
c:horter intervals if necessary due to environmental or operating conditions.
the
circuit breaker is not operated auring extended periods, the breaker should not remain in either the
closed
or open position any longer than six months. Maintenance opening and closing operations sho uld be
made to ensure freedom of mo vement of all parts.
. 2 -
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..
OPERATION
DESCRIPTION
The LA - 3200 air circuit breaker has a maximum continuous current rating of 3,200 ampere s, and an
interruption rating of 65,000 amperes at 254, 508, or 635 volts 60 Hz., when used with the short time
delay trip device. With instantaneo us trip device, the interruption rating is 85,000 ampe res at 254 vol ts,
65,000 ampe res at 508 volts, an d 65,000 amperes at 635 volts.
The
LA-4000A and B air circu it breakers have a continuous cur rent rating of 4,000 ampe res and an int er-
ruption rating of 85,0 00 amperes when used with the short time delay trip device. The inter ruption rating
with instantaneous trip device is 130,000 amperes at 254 volt s, 85,000 amperes at 508 volt s, and 85,000
amperes at 635 vo !ts. All currents are symmetrical amperes and vol tages are maximum.
Th ree configur at ions of the operator are availab le for charging the closing springs. These are:
(
A. ) manual charging,
(B.) electrical charg ing
(C.) combina t ion manual-electrical charging
All operato
rs are identical except for the means of supp lying energy to the closing springs.
A
double-to ggle, tr ip-free mechanism is use d; that is, the breaker contacts are free to open at any time, if
required, regardless of the position of the mechanism.
(A.) Manually-Operated Breaker (Refer to F ig ure 2 a nd Table 1)
The breaker has a
center - mounted frame so many of the latches and li nks are arranged in pairs; for descrip-
tive purposes
they wil l be referred to as single items. Detail "A" s how s the position of the trip latch and
toggle linkage
when the breaker is open and the closing springs are discharged. Movement of the charging
handle
downw ard rotates closing cam ( 204 ) against roller (168), thus pivoting closing cam ( 159 ) about pin
(215) and extending t he closing springs thru l ink (163) and spring hanger (157). Rotation of cam (159)
allows
ro ller (181) in to gg le linkage to be moved in to position shown in Det ai l "B". Kickoff springs (199)
move rolle
rs away from stop bloc k (1 71 ), then the toggle linkage is moved by torsion spring unti l latch
(175) clear
trip la tch (153A). Spring (155) causes trip latch (15 3A ) to reset under lat ch (175). Trip flap
(1538) should normally stop against the front surface of latch (175).
When the closing springs are
fully charged, ro ll er ( 168 ) engages latch ( 148). Charging cam ( 204 ) engages
pawl (146) in such a manner that the charging cam must complete the charging stroke before it can return
to its normal position.
With the charging handle in its normal upright posi tion, the breaker can be closed. By pressing firmly on
hood (149), latch (148) will di sengage roller (168) and closing springs cau se closing cam (159) to rot ate
aga inst the toggle rollers (181 ) movi ng the togg le into its upright pos it ion, shown in detail "C" . T he closing
cycle can be in
terrupt ed at any po int by operation of one of the tripping means, which cause rotat ion of
trip latch ( 153A ) to a position that rele ases latch (175) allowing toggle linkage to collapse to the position
shown in detail "A".
Manual opening of the breaker is accomplished by pressing in manual trip bar ( 188 ). This bar engages the
top of trip flap (1 538 ) which is in tu rn arranged to disengage the tr ip latch (175).
TABLE 1 - OPERAT I NG PROCEDUR E - MANUALLY - OPERATED BREAKERS
Operation
Charging Springs
Closing
Tripping
Procedure
Make su re that th e racking clevis' are in either test or connect po sition. Never pull
charging handle
down with clevis' in disconnect position as shown in Fig. 4.
Pull charging handle
down all the way (approximately 120 °) and return to normal
vertical
position. (Engagement of paw l with the ratchet teeth prevents handle re·
versal until the downward stroke is completed.)
Push
down firmly on spring-release latch hood (149) after handle is returned to normal
vertical position.
Push in manual tr ip bar ( 188 ),
OR
If shunt trip is provided, operate r emo te trip control switch (CST). (See Figure 3.)
- 3 -
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(B.) Electrically - Op erated Breaker (Refer to Figure 1 -2 and 4)
: The mechanism of the electrically operated breaker is th e same as the manually oper ated breaker except
th at the manual cha rg i ng handle is replaced by a motor and gear system. With power ava ilable to the con-
trol ci rcuit, closing the motor con trol switch (Ml) wil l sta rt the automat ic charging cycle. The motor gear
box pinion rotate s gear ( 224 ) co unterclockwis e, cam follower (233) engages an arm of wind and close
ca m ( 223 ) which rotates the cams in the sam e manner as for the manually charged breaker. When the
wind and close earn (223) reaches its charged pos ition , the back of t he cam eng ages switch lever (229)
rotating t he lever away from the switch operator. Gea r switch lever (23 1) will still be holding th e switch
in the operate posi tion, and the motor will continue to run until the roll pin s on the side of gear ( 224)
lifts lever (231) clear, re leasing the motor cutoff switch {M CO ). When the MCO switch op en s, th e motor
sto ps, and the closi ng coil circuit is set up through one side of the MCO swi tc h.
The
bre aker can now be closed by depressing the latch hood ( 149 ) or by energizing the closing co il
(CC)
throu gh the external close control switch (CSC). When the close circuit is energized, the "Y " relay
is energi ze d and opens the "Y" contact in the mo tor circuit, thus p re venting "pu mp i ng" or repeated at-
tempts
to charge the clo sing springs.
If the close
circuit CSC switch is open ed , the motor will au tom atically recharge the closing springs, if
power is ava ilable for the motor circuit. The cl ose coil circu it is always interr upted by the motor cut-o ff
s
witch MC O. Trip free operation of the mechanism, discharging the sprinQs on a closed breaker is pre-
vented
by comp leting the close coil circuit through an auxiliary contact of the breaker.
TABLE 2 - OPERAT I NG PROCEDURE - E LECT RICA LLY - OPERATED BR EAK ERS
CAUTION!! MAK E SURE THAT RACKING CLEVIS ' (FI G. 4) ARE IN TEST OR CO NN ECT POSI-
TION
BEFORE C HARG ING SPR INGS. DO NO T CH ARG E SPRINGS WI TH CL EV IS'
IN
DISCONNECT POSITION AS THIS COULD CAUSE DAMAGE TO BREAKER.
Operation
Charging Springs
Closing
Tripping
Procedure
Energize
con tro.J circuit. Move motor control switch on fr ont of breaker to "ON"
positi on.
After springs are cha rg ed, actu at e remote close control switch (CSC).
OR
Pu sh down firm ly on spring-r elease latch hood (149).
Actu ate remote trip control switch (CS T).
OR
Push in
man ual trip bar (188).
(C.)
Combination Operated Breaker
Th e combination manually and el ectrically operated br ea ker includes both the moto r-gear charging
system
as well as the manual charge handl e. NOT E: Manual Handle must be in vertical position during
e lect rical c ha rging.
Drawout I nter l ock
The breakers incl ud e as integral parts the mechanism to rack the breaker in or out of t he cubicle comp art -
ment, i
nterlocking to prev ent racking a closed breaker into or out of the connect ed position , and in te r-
locking
to preve nt withdrawing a breaker fro m the cubicle while the closing springs are charged.
Racking Mechanism
Refer
to page 17. With the breaker resting on the cub icle rail the fol lowin g sequ ence s hould be u sed to
rack the breaker into the cubicle.
CAUTION !! N EV ER IN STALL OR REMOVE A BR EA KER FROM THE COMPARTM ENT WITHOUT
HAVING RAIL EXTENSIONS IN PLACE. SEE PAGE 17 .
C
AUTION!! ON ELECTRICALLY OPERATED BREA KERS, BE SURE M OT OR CO NTR OL SWI TCH
ON THE FRONT OF THE B REAKER IS OFF.
1. Push tr ip bar in, lower interlock slide and insert racking crank. NOTE: Interlock slide cannot be open-
ed
un l ess manual trip bar is pressed in. While the trip bar is pressed in, the breaker is in the TRIP- FREE
position and cannot be closed.
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2. With the racking crank, rotate the racking screw (273) u nti l the racking shaft is in t he disconne ct ed
position. T he clevis can now engage the racking pins (E l in the cubicle. The breaker should now be
pu
sh ed along the ra il into the DI SCONNECTED pos ition . Double check that the racking cl ev is does en-
gage the pins in t he cubicl e.
3. Check to see that the floo r i nterlock (Item 11 3) is clear befor e racking.
4.
Count ercl ock wise rotation of the racking screw will rack the breaker in to the TEST posi tio n. At the
TEST p os ition, the floor mounted interlock isclear and the cover slide interlo ck can be closed, allow -
ing the
tr ip bar to ex tend and the breaker ca n be operated. (Between the TEST pos iti on and the CON-
NECTED position, the slide interlock will engag e the stop pin and the br eake r will be tripp ed throu gh
the interlock mechanism, and the cover slide ca nnot be closed.)
In the CONNECTED position, the slide interlock will clear the s top pin of the racking toggle and the
fl
oor inter l ock is clear allowing the breaker to be clo sed. Th is prev en ts mov i ng a clo sed breaker int o or
out of the CONNECTED pos iti on.
5. To withdraw the breaker fro m the CO NN ECTED position, the procedure is the same only the racking
screw
ro ta ti on is clockwise.
6.
Befor e attempting to operate the breaker, the positi on of the devi ce should be checked with reference
to the marking in t he cubicle, to be certain that it is fully connected. Two stop nuts are provided on
the racking screw
to set the connected position. The se are adjusted by setting the angle of the racking
clevis,
as shown in detail "D" of Figure 1, and by tightening the nuts against the "L" link s (281) the
two nuts ( 278 ) should be then locked against each other.
CAU TION!! TO AVOID DAMAGE TO THE RACK I NG MECHANI SM, DO NOT ROTATE THE RAC K-
ING
CRANK IN THE COUNTERCLOCKWISE DIRECTION WHEN IN TH E CO NN ECTED
POS IT ION.
Spring Discharge
In te rlock
When racking the breaker out to the DISCONNECTED position, the closing spri ngs will aut o matically dis-
charge,
at or befo re reac hing th e disconnect posit ion. The barrel nut engag es the sp ring i nter l ock. This in
turn connects to the manual cl ose hood which releases the closing spring s.
CAUTION!! ON MANUALLY CHARGED BREAKERS, THE CLOSE HOOD IS INTERLOCKED TO
TH E M ANUAL CHARGE CAM, AND MUST BE CLEAR BEFORE RACKING THE
B REAK ER TO THE DISCONNECT POSITION.
NOT E:
Manual charge handle
must be in vertical positio n during ra cking and ra cking mechani sm must be returned
to the test position before closing springscan be char ged while breaker is remo ved from cubic l e.
Note al so that the spring discharge interlock produces a TRIP - FREE operation in which all of the stored
energy
of the sprin gs is dissipated in the mechanism. It is preferable to turn the motor contro l switch off in
the
TEST pos it ion, clo se the breaker no rm ally in that po sitio n, then rack out in th e normal manner.
. 5.
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MAINTENANCE AND ADJUSTMEN TS
. ·
AINTENANCE
Occasional checking and cleaning of the breaker will promote long and trouble -free service. A per iodic
inspection and servicing, normally at intervals of one year, should be included in the maintenance routine.
Circuit breakers lo cated in areas subject to acid fumes, cement dust, or other abnormal conditions, requir e
mo re frequent servicing. After a severe overload interruption, the breaker should be inspected.
If the circu
it breaker is not operated during extended periods, it should not remain in ei ther the closed or
open position any longer than s ix months . Maintenance opening and closing operations sho uld be made to
ensure freedom
of movement of all parts.
A suggested procedure
to follow during main te nance inspections is given below.
1. De-energize the
primary and contro l circuits.
2. Rack breakers
to the disconnected position.
3. Install rail extensions.
4. Remove breaker from cubicle.
5. Remove arc chutes
(Figure 1, Item 901) and examine for burned, cracked or broken parts. To remove
arc chute
s, proceed as follows:
a. Remove wing nuts from holding bar, remove bar and phase barriers.
b.
Lift arc chutes vertically to clear arc runners.
6. Wipe the
contacts with a clean cloth saturated with a non- toxic cleaning fluid.
7. Replace badly burned or pitted contacts. (See Contact Replacement, Page 8, and Lubrica tion lnstruc·
tions,
Pages 6 and 21.}
8. Wipe all insulated parts with a clean cloth saturated with a non-toxic cleaning fluid.
Bearing pins and other sliding or ~otating surfac es should be cleaned and then coated wit h a light fi lm
of grease. (See Lubric ation chart page 21.)
10.
Turn racking crank to put racking clevis' in either test position (s l ot straight up & down} or connect
position slot toward you. Do not attempt to manually ch arge springs wi th clevis' in disconne ct position
as shown in Figure 4.
11. Charge
the breaker manually for maintenance closing ( see Maintenance Closing below) to check latch
and linkage
movement.
12. Check breaker adjustmen ts (see Adjus tments , Page 7).
LUBRICATION
Lubric atio n should be a part of the servicing procedure. Old grease should be removed from bearing pins
and
other non-current carry ing rotating or sliding surfaces, and they should be wiped with a thin f ilm of
petroleum-oil-base precision -equipment grease, such as BEACON P-290.
Greasing should be
done with care so as to avoid getting on insulating members, since it may affect the
dielectric strength. Faces
of main and arcing contacts should not be lubricated. The rubbing surfaces of the
main
contact fingers and hinge contact fingers are lubricated with coating of Siemens- Allis contact lubri-
cant, 15 - 171-370-002. If dust has accumulat ed, disassembly is necessary to clean and relubricate these
points.
(See Contact Replacement. Page 8, and Lubric ation Instructions. Page 21).
.
MAINT ENA NCE CLOSING
During inspection prior to instal lation and for routine maintenance inspections. the breaker contacts may
be closed slowly to check clearances, contact adjustments, and movement of links and latches. A manual
charging handle
is used for maintenance closing the breaker.
"
ectrically -operated breakers do not have a manual charging handle, but it is available as a maintenance
-. ~m. Figure 5 shows the charging handle ins ta lled in an electrically -o perated breaker after removal of
the front cover from the breaker. When the hole in the charging handle as s embly is aligned with the
holes in the
operating mechanism frame, the pin which is attach ed to t he cam is inserted. This pin holds
the assembly in place and acts
as a pivot point for the cam. After installation of the manual charging
. 6 .
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handle assembly on the electrically·operated breaker, the actual maintenance closing operation is the
same for hath the electrically-operated breaker and the man ually ·operated br eake r. Refer to Table 3
and Figure 5.
CAUTION II TH E PROCEDURE IN T ABL E 3 SHOULD BE USED FOR MAIN TE NAN CE C LOSING
O NL Y. MAIN TA IN A FIRM GRIP ON THE MANUAL CHARGING HANDL E DURING
TH E CLO S ING STROKE - TH E BREAKER MAY SUDDEN LY LATCH F ULLY CLOSED
AN D APPLY UNEXP EC TED FOR CE TO THE CHARGIN G HANDLE .
TA BLE 3 - MA I NTENANCE CLOSIN G ( Ref er to Figure 5)
CAUTION!! TU RN RA CKI NG CRANK TO PUT RA CKING CLEVI S' IN EITHER TEST POSITION
( SL OT STR AIGHT UP & DOWN) OR CONNECT POSITION SLO T TOWARD YOU . DO
NOT ATTEMPT TO M ANUALLY CHARG E SPRINGS WITH CLEVIS' IN DISCONNECT
PO SITI ON AS SHOWN IN FIG. 4.
Operation
Closing Contacts
Procedure
1. P ull charging handle DOWN A LL TH E WAY (a ppro x imately 120 °) , and hold handle
down.
2. Pl ace blade of screwdriver between ho od and sp ring release latch a nd hold it in this
position. T hi s prevents sp rings from latching in charged pos itio n, or se e no te below .
3. S
low ly return handle to vertical position. Observe cont act, touch, mechanical op era·
tion, etc.
4.
Re move screwdriver a nd pull charging handle to the fully charged posit ion. All ow
sp ring release latch to hold closing springs. Move chargi ng handle to th e verti ca l
po s it ion.
5. C
lo se breaker norm a lly by pressing clo se hoo d.
Opening Contacts Push
in manual trip rod.
NOTE :
Holding the spring rele
ase latch down prevents the stored -ene rgy springs from propping in the charged posi-
tion. Th us , when th e handle is s lowly returned to the n orm al v ert ical position, th e energy in the springs is
slowly rele ased against th e clo sing handle assembly cam fac e. •
ADJUSTMENTS
D ur ing maintenance inspections, the following items should be checked to ensure that the or iginal se ttin gs
are maintained:
Trip Latch Engagement (Figur e 2)
Togg
le latch ( 175) should eng age th e fu II wi dth of tr ip l atc h (1 53A ) when the breaker is closed in the nor·
mal manner. The tension on spring ( 155 ) can be increased if required by bending spring tab on tr ip flap to ·
wards the
front of the breaker. Too much tension will interfere with the cap ab ili ty of the tripping actuator
to move the trip flap, so over-bending s houl d be avoided.
Main
Contact Make ( Figur e 6)
Compression
of cont act fingers (58) should be between .093 inch es and .12 5 inches. This is the difference
in
the measurement from the breaker b ase to the tip of the fin ger contact surface when the breaker is open
a
nd the measurement in th e sam e pla ce wh en the breaker is clo sed. This is checked with a normal closing
operation - not maintenan ce clo sing. Adjust me nt is provided by positioning screws (85) aft er loosening
nuts
(86). Cou nte rc loc kwise ro t ation of scr ew s ( 85 ) increasescompression. Ca re should be tak en to re tight-
en nuts (86) after adjustment. If it is desired to check contact pressur e, a push· type spring scale can be us ed
to compress contact fin gers ( 58 ), with breaker open. Contact pressure should be betw een 20 to 30 pounds
on each finger.
Arci ng Contact Make (Figure 6)
With movable ar ci ng contact (73) in any one phase touching the mating station a ry contact when the break-
er
is closed by the maintenance closing method ( See Table 3, Fig. 5), the phase-to-phase variation should
not ,exceed . 062 inches. Adjustment may be made by positioning screws (85) as in the pr evious paragraph,
- 7 -
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· .. ut it is ess ential that the main cont act com pression be maintained w ithin t he tolerance listed in the pre-
vious paragraph.
Arcing conta ct p re ssure should be between 20 an d 30 pound s when checked with a pull-
type spring scale at the base of the arcing contact tip insert with the breaker contacts closed. M eas ure each
blade
se parately.
Conta ct R ep l ac ement (Figure 6)
The contacl structu re consists of main cur rent carrying contacts and arcing contac ts arranged so that initial
contact mak e and final contact break is by means of the arci ng contacts. The actual contact surfaces are
clad wi
th an al loy facing which greatly redu ces mechanical wear and arc erosion.
When inspection
of the all oy facing indicates th at the contacts should be replaced, it should be noted that
hinge cont act fingers ( 66, 67) main contact fingers (70) and arcing contacts (73) are spring loaded. There-
fore, care
must be exercised in removal and install ation of a ny of the contacts.
Main Cont act Fingers (Figure 6)
With the breaker contact s open and th e stored-energy spri ngs di sc harged, main contact fingers (58) may be
removed by loosening scr ew s (75) enough to relieve the compr ession on springs (54, 57). The re a re two
springs behind each finger and it is important that they be positioned properly upon reinstallation. If diffi-
culty is experienced in correctly positioning t hese springs, the upper and lower prim ar y disconnects ( 902 ,
Figure 1) may
be removed fr om each phase and the breaker inv erted to rest on the ends of connec to rs (52)
and (62).
Stationary Arcing Cont act (Figure 6)
The stat ionary arcing contact is par t of connector (52) and may be re pl ac ed by proceeding as above. In this
case, scre
ws (60) must be rem oved.
rlinge Con tact Fingers (Fig ure 6)
Hinge
co ntact fingers can be replaced by removing lower co nnector and removing fingers individua lly.
Moving Arcing and Main Contact (Figure 6)
Eithe r moving arcing cont ac t (73) or main con tact (70) or both may be re moved and replaced as foll ows:
Remove
two screws on each side of lower connector. The comp lete movable conta ct assembly may n ow be
bro ught to a bench. The loca tion of spacers s hould be noted, in disa sse mbly.
CAUTION!! EXTREME CARE SHOU LD BE TAKEN TO H OLD THE ASSEMBLY Fl RMLY TO RE ·
TAI N SP RING GUIDE (80) AND SPRING (82, 83) U PO N REMOV AL OF TH E SC REWS.
The moving arcing contac t or the main contact may now be easily replaced. The rev erse procedure is fol-
lowed for re-installation. Care should be taken to replace spacers corre ct ly. Check align ment and adjust·
ment of con tact s upon reassembly.
Tripping Actuator
Wh en the static trip device sen ses a circuit condit ion that re quires the cir cu it breaker to open, it pro duces
an
output t hat is fed to the tripp ing actuat or. Th is device then causes the circuit breaker conta cts to open
and isolate the circ
uit.
Mounted on the c ir cuit breaker, the tripping actu ator is held in a cha rge d position by a perman ent magnet.
It contains a coil that is energized by the output of the static trip device. Wh en energized, the coil causes
the m ag netic flu x to sh ift to a new path, releasing the stor ed energy of a spring located inside the tripping
-: c tuator. Th e spring provides the en ergy to trip the breaker moving the tr ip flap clear of the toggle la tch.
.r the spring lo
ad ed arma tu re does not reset during trip operation as explain ed abov e, spacer washers may
be added
to ob tain positive reset of the arm at ure.
If adding space rs does not allow the armatu re to be res et, the t ripping actua tor should be replaced (i f break·
er mechanism
is not at fault ).
. 8 .
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N OT E:
Do not at t empt to disassemble the tr ippi ng actuator as th is may destroy the magnetic fie ld set- up by the
permanent magnet and
wil l render the actuator latch inopera ti ve u nt il remagnetized.
When repl
ac ing a tri ppi ng act u ator , the coil leads must be connected to the ter minal block of the st at ic
trip in the correct polarity relationsh ip .
The bla
ck l ea d of coil must be co nn ected to terminal 7 (negative) a nd th e reel lead of coil conn ec ted to
te rmi nal 8 (positive) of the static trip device.
Wh
en th e trip ping actu ator has been rep la ced, the circuit bre ak er s hould be giv en a FUN CT ION TEST to
en
su re proper operat io n of all com pon ents. Re fe r to Siemens-Allis I nstr uction Book 18X4827 for the
pr ocedures of th e F UN CTI ON TE ST.
Motor C utoff Sw it ch es
The fun ct ion and a djust me nt of t he motor cut o ff swi tc hes on elec tr ic ally -o pe rated br eakers is described on
P
age 10 .
-9 -
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P osition 1.
Position 2.
Posi
tio n 3.
BOTT OM VIEW
S
pr in gs discharged; motor in s top po sition. Note that spring pos it ion lever (1) is f or ward actua-
ting
both switches. Motor /gear position (2)
lever
is retracted. Motor cutoff switch (3) is
closed. Application of power at this time will
cause the motor to sta rt thereby charging the
closing springs.
Spri ngs charging; mo to r not yet cuto ff. While the spri ngs are charging the motor / gea r po s iti on
lever (2) moves
for ward applying pressure to
the switch actuating leaf. Th e spring position
lever (1) retracts as the springs re ach fu II
charge. The mot or cutoff switch (3) is closed
and the
motor is runn ing.
Spri
ngs char ged ; mot or stop ped. The sp rings have reached charged p os ition. The mot o r/ g ea r
l
eve r (2) has been retracted by ro ll pins on the
la rge gear as the cam fo ll ower (233, Figure 2)
on the large spur gear has disengaged from the
wind and close cam ( 223 ). The m otor c utoff
s wi tch (3) has opened, stopping the motor, and
the closing coil s
wi tch (4) has closed. Upon
app lication of power to the closing c irc u it the
br
ea ker will cl os e. Switches the n retu rn to
No. 1 position. R efer to Notes 1 & 2.
NOTE 1 In position 3 there isclearance betwe en both levers and the switch actuating leaf. Clearance may
be minimal (appx. 1/ 64) or up to 1/16 inch. It is important to completely remove pressure from
the switch actuating leaf to be sure that the switches are free to actuate. A djustment is made by
ca ref ully bending th e levers as indi cated by arrows (It ems 1 and 2). Do not bend the switch actu-
a
ting leaf.
NOTE 2 CAUTION!! If the motor cu toff switch (3) does n ot open, the motor will continue to run and the
cam
fo llower (233) w ill re -engage wind a nd close ca m (223, Figure 2) jamm i ng the entire mech-
an is m, possibly str ipping gears in th e gear motor, bl o wing the control fuse, or damaging the motor.
To free a jammed mechanism it is n eces sary to remove the gear motor.
CAUTION!! The springswill discharge and the breaker close when the gear motor pinion is dis-
engaged
fr om the spur ge ar.
. 10 -
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ACCESSORIES
Tripping Transformers - Static Trip 11
There are several tripp ing transformer ratings available, each with seven ca li brated pickup sett in gs (Page 12).
The
tr i pping transformers are mounted on the lower connector and mounted with the pol arity mark facing
the breaker panel.
Current Sensors - LimiTrip
The current sensors provided with the optional LimiTrip device are integrated units containing two cores
with
four terminals. Proper polarity is established when the terminals face away from the panel. Li miTrip
sensors should never be subjected to primary current with the LimiTrip device disconnected from the
sensor.
OPTIONAL DEVICES
Secondary Disconnect Assembly Option
The electrical attachments are wired to the termina ls of a secondary disconnect assembly ( See Figure 7),
which
is mounted on the left side of the breaker. Thre e blocks of ten terminals each can be mounted on
the breaker. The secondary disconnect assemb ly is accessible from the front of the breaker and aligns with
a stationary unit in the cubicle. The stationary contact strips should be lubricated with a l ight fi lm of con-
tact grease which is furnished with the switchgear.
Auxiliary Switch Option
The auxiliary switch (See Figure 8) is of the rotary type and functions by direct connect to the breaker
mechanism.
The contacts are factory set for "a" (open when the breaker is open) and "b" (closed when
the breaker is open) position, but each rotor (955) may be adjusted individually in steps of 30 degrees. This
adjustment is made by removing cover (962) and lifting the entire rotor assembly out of case (950) after
disconnecting arm (957) from the linkage. Cotter pin and bearing (956) are removed to perm it re-
moval of rotors (955) from shaft (954). To change rotors (955) from "a" to "b" position, the rotor should
be rotated 60° in the clockwise direction aher removal and replaced on the shaft in this new position.
Shunt Trip Option
Each el ectrically -operated breaker is equipped with a shunt trip attachment for tripping from a remote
l ocation. (See Figure 9). Since the shunt trip coil is designed for a momentary duty cycle, an "a" auxiliary
contact switch is used to interrupt its circuit immediately after the breaker is tripped. Energization of the
coil causes the armature to pick up and rotate the trip latch to trip the breaker. A compression spring (808)
ret urns the ar mature to its norma l position .
Undervoltage
Trip Device Option
The undervoltage trip device (Figure 10) automatically trips the breaker on l oss of voltage. Either instan-
taneous
or time - delay operation can be supplied. A .06 inches gap should be maintained between flap ex-
tension and
pull link (738) when the device is energized with the breaker closed. Pick-up and drop-out is
set so that the device picks up at a voltage of 85% or less of rated value and drops out between 30% and
60%
of the rated value.
NOTE:
Pick-up and drop-out are not ind iv idually adjustable.
Bell
Alarm Switch Option
The bell alarm switch option (See Figure 11) functions to operate a switch. A single pole double throw or
a double pole double throw switch is available. The switch operator is connected to and is operated by the
tripping actuator. The switch operator remains tripped even when the actuator is reset by the breaker. The
switch operator must be reset either manually, or by an additional optional electrical reset solenoid.
The contacts of the bell alarm switch can be connected in series with the breaker closing coil, to provide a
lockout feature to prevent reclosing after a fault.
- 11 -
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-·
TABLE 4 - TRIP RATING TABLE - AMPERES
STATIC TRIP II
Breaker
Tripping Long Time Element Ground Element
Type and
XFMR
Calibrated Pick-Up Settings Max.
Ca lib rated Pick-Up
Frame Rating
Cont . Setting s
Size (Primary) A B c D E F G Rating 1
5% 25 % 50% 100 %
LA-3200A
2000 Amps 1000
1250 1500
1750
2000
2250 2500 2500 300 500
1000
2000
LA-3200A
3200 A mp s
1600
200 0 24
00
2800
3200 3600
4000
3200 480 800 1600
3200
LA-4000A
4000 A mp s 2000 2500 3000 3500 4000
4500
5000 4000 600
1000
2000 4000
&8
TABLE 5 - TRIP RATINGS - AMPERES
LIMITRIP
Breaker Tripping
Lon g Time Element
Type and XFMR
Calibrated Pick-Up Settings Max.
Fram e Rating Co nt .
Size (
Primary ) A B c D E F Rating
1
.A-3 20 0A
2000 Amps
1000
1250 15 00 1750 20 00 2250
2250
_A- 3200 A 3200 Amps
16'o0 2000
2400 2800
3200 3600
3200
LA-4000A
4000 Amps 2000 2500 3000 3500
400 0 4500 4000
&8
Static T rip Op ti on
The opt ional tripping devi ces are covered in detail un der their own instruction books which are ref erenced
on the last page. Several types are available that provide a range of tripp ing functions.
The Stat ic Trip 11 device mounts on to a slide type bracket on the circ uit b rea ker. To remove trip device,
the terminal block cover located above the trip device should be removed, exposing the term in al block
screws. The lower r ow of screws can be loo sen ed with a scr ew driv er, al l owing the terminal bloc k fanning
strip from the static trip to be re mov ed from the terminal block. Removal of the fanning strip exposes a
mounting screw. Th is screw can be removed allowing the static trip device to be removed from the breaker
by pulling the tr ip device towards the front of t he br ea ker .
. 12 .
Courtesy of NationalSwitchgear.com

w
902~1
DETAIL ' D"
~ : ! , I
··-) ' .1
1 1,
I
I 1, I
I '·
I"
I 01
11
C0
1 .. ~ 1:.
1'd 1·
I I 1lt
I •I
1 11 ;
I 1 11 .
' 1'
I , 1 1
11
278
I '-I II
I I I I " ~ '-;, . -..- -
I ~ 11 1 II
I ~ ~ . l l., I Ill
~ :l}{J'·J ~ : t
g 1©
===: y --~:iff · ~ r- = "~ ~-~ ~ ··= 1 ~
, ... ~L!J 4l ~
LH SIDE VIEW B
12-
901
13
0 0
RH SIDE VIEW C
240
241
0
,--
1
--\
J_ ___ L ----· I
--902
0
0
~ ~ u
SECTION " AA"
' ~ 0
'-sy li'L-- 1- ~ ' t
~ 6
I \
\
113
241 240
• .::
.....
ill 0 v
~ - · 1 J~·
L_;_
''"' 'M '-J I t= ~~ - ··
FRONT VIEW A
Fig. 1 - LA - 3200A Circuit Breaker
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~
~< 181
/ ~w
DETAIL "A" \
153A
' 175
s~ i
- 0~-~I
DE TAI L "B"
,::;
-- 0'
J .- _)
ur ll
DETAIL "C"
231
:.: :~ 168
VIEW AA
VIEW EE
215
171
, LH S ID E VIEW FRONT VIEW
155 l- 3
VIEWFF ~
cr-14 -- · .
15 38
Fi g. 2 - Operator
/148
\.
VIEWD
E
223
233 224
RH SIDE VIEW
1 1
224 --.:_ -·-- LU. !..- ':J-,
c:: ... .. . ;1": · ·;7 ... . ~
VI EW HH
I!I 16 1
~ I ~
.J
l
jj
•
F
- -..... , 1155
. ~J j,. : t• -1
' ...;:./ - L" -
-:.::f'=r -
Courtesy of NationalSwitchgear.com

- ~--- - ---- -- -- --- ---- -- ~- - ~ ---
• - r - ~ I I
LJJ.. _w '-- r - - - 1--- -- - -. -- i i
I ~ ' r1 , I
I ..l..c sc 1 1 1 ' ...Lc sr
I l,..J c,. J T
I T ,- ... ,...J,
I I G \ I R 1 I
I ' / ' , I
I I T .,.
~ l J. , h.~ 2
y~
I
r-!l=] }-- - --- --- - - ~ -- - - I
2
I
---4---- ---- - - - -- - - - - ---- ... --
SY MB OL S
SD
10
?
°SY
°JV
°6V
~
~
°3V
Q-' ;"v
~
~
SEC. DISC.
S
TD
STA T IC TR IP DEVICE
AS
f.1 f3fsf7
T a bT a b
6 2 4 66 8
AUX. SWI TC H
CC - CI RC U IT BREAK ER CLOS ING CO IL
TC - CIRC UIT BREA KER TR IP COi L
Y - AUX. CLOSING
REL AY - AN TI PUMP
M
CO -MOTOR CUTOFF SW ITCH
88 - SPRING CHARGING M OT OR
CSC - CO N TROL SWITCH - CL OSE CONTACT
CST - CON TROL SWITCH -TR IP CO NT ACT
R - RED INDI CA TIN G LA MP
G - GREEN INDI
CAT ING LAMP
a - AU X. SWITCH -OPEN WHEN BR 'KR. IS OPEN
b -
AU X. SWITCH - CLOSED WHEN BR'K R. IS OPEN
Ml - MECHANI CAL I NT ERLOC K
CT -
CURRENT TRA NSF ORME R
STD - S
TATI C TRIP DEVI CE
AL - AL ARM DEVICE
RC - ALARM DEVI CE EL EC T. RESET COIL
TA -TRIP ACTUATOR
UV -UNDE RVOLTAGE TRIP COIL
CLASS C WI RI NG
NO. 14
WI R E. (S IS)
00·557·286·3
41
MCO
F ig. 3 - Typical Wiring Diagram -Electrica lly Operated Breakers
. 15 .
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Lift Bar a nd Rail Ext ensions
The l
ifting bar connects as shown. Always l ift wit h ex tr eme caution to preve nt damage to breaker. In part i-
cular, wa
tc h that the secondary disconnects clear the rail extension. References: Lifting bar assembl y:
18-727- 837-501. E xtension rail: 18- 193-732 · 502. See Pag e 4.
...
= · -~
I
(0
LIFTING BAR --- r-:-..,,,- - ---- - -~ c0 ~- --- - -- - -.
LIFT HERE
RACKING
CLEVIS
L
.
.::
;
_ ...... .... -
...- · ,.....,.
MECHANICAL
INTER LOCK
SIDE VIEW B
FRONT VIEW A
I
I .. ..
SE CTI ON BB
DETAIL "A ..
Fig. 4 - Typical Racking Mechanism and Dr a wou t Interlock
-16 -
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HANDLING INSTRUCTIONS
INSERTING CIRCUIT BREAKER
1. Mount extension rails (A) as shown. Tighten catches
(Bl to secure r ai l s.
2. Lower circuit breaker onto ra il s. checking wheel align·
ment to ra ils.
3. Roll breaker to disconnect posit ion and remove exten ·
sion rails.
Safety lock (C) prevents accidental removal
of breaker from cell.
4. Use crank to rack breaker into cell.
5. Check panel
shutte rs (0) for free movement befor e
closing panel.
. 17 .
'
REMOV ING CIRCUIT BREAKER
1. Mount extension rails to un it as described under. " In·
serting Circuit Breaker."
2. With c irc uit breaker in disconnect position. release
breaker i nterloc k and pull breaker out.
3. Pu ll on safety loc k handle to fully release breaker from
ce ll.
4. Roll breaker ou t onto extension rails and li ft free of
unit.
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