Siemens-Allis Static Trip II User manual

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SIEMENS-ALLIS
Switchgear
INSTRUCTIONS
STATIC TRIP II
OVERCURRENT TRIP DEVICES
USED WITH
TYPE LA POWER CIRCUIT BREAKERS
18X4827-03
March,1978

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INTRODUCTION
This instruction manual contains descriptive, operating,
testing and maintenance information for SIalic
Trip II
static overcurrent trip devices, several of which are
shown in Figure I. Static Trip II devices are used with
600-volt class, Type LA power circuit breakers. A com-
plete technical description of their circuits and how they
operate is contained in a separate instruction book,
18X4814 "Description of Operation -Static Trip II
Overcurrent Trip Devices used with Type LA Power
Circuit Breakers",
WARRANTY
The sales contract carries all information on warranty
coverage.
Figure J. - SIalic Trip II. Sialic Trip Devices
11

DESCRIPTION
General
Sraric Trip II overcurrent trip devices are completely
static -there are
no moving parts or contacts. Com-
ponents used are semi-conductors, integrated circuits,
capacitors, transformers, etc.
The circuits are desig ned
for conservative loading of components for long life and
little maintenance.
,
Static Trip II overcurrent trip devices operate to "pen
the circuit brea ker when the circuit current exceeds a
preselected current·time relationship.
Depending on the
magnitude of the
overcur rent and the selected settings,
tripping may be
in stantaneous or time-delayed.
Energy
to operate the tripping sy stem is obtained solely
from the circuit being protected. Batteries
or other
power sources are not ne eded.
SERIAL NO.
DATE MFG.
VOLTAGE
MTR. CLO.
TRP.
TRIP XFMR
11A.
WIRED PER
LONG TIME PICKUP IN AMPERES
A B C D
E F G
MAX CONT CURRENT
AMPS
SIEMENS-ALLIS
MILWAUKEE , Wi.
MADE IN US.
Figure 2. -Breaker Rating Plate
The complete static overc urrent trip system consists of
three parts - (I) primary circuit current transforme rs
(2) the Static Trip II device (3) a magnetically held
circuit
breaker latch release device called the tripping
a ctuator .
Current Transformers
Toroidal current transformer s, sim il ar to sta nd ard bush-
ing
current transformers, are mounted, one-per-phase on
the primary studs of the circuit breaker. Also called trip -
ping transformers, they provide a signal to the static trip
device
pr opo rtional to the primary current , a nd are used
o
nl y for that purpo se. The tripping transfo rm ers selected
for a specific circuit breaker establish the maximum
con-
tinuous curr ent rating of that breaker and the adjustment
range.
Each tr ansformer pr ovides a choice of seven con-
tinuous
current settings which are listed on the br eake r
rating
pl ate (Figure 2). The highest setting is 2V2 times
the lowest setting.
1
Static Trip II Trip Device
A metal enclosure, attached to the breaker, houses the
trip device and its electronic circuits.
The static trip
device receives
the signal from the tripping transformers.
It monit ors the signal, senses overloads and faults, a nd
determines the requir ed action in accordance with pr e-
selected control knob settings.
On the front of the metal
enclos
ur e is a calibration plate with the necessary ad-
justing knobs (Figure 1).
Tripping Actuator
When the sta ti c trip devi ce senses a circuit condition
that requires the circuit br eaker to open, it produces an
output that is fed to the tripping actuator. The actuator
then causes the circuit breaker contacts to open and
isolate the circuit.
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•
a.
Fi gu re 3. -Tripp in g Actuator
M ounted on th e circuit breaker. the tripping actuato r
is held
in a cha rged position by a permanent magnet. It
contains a coil that is energized by the output of the
s
tat ic trip dey ice. When energized, the coil cau ses the
magnetic flux
to shift to a new path, releasing the stored
energy
of a s prin g loca ted inside the tripping act uator.
The spring provides the energy to trip the breaker. See
Figure 3.
Removing Static TripllFrom The Breaker
Stat ic Trip.II units are easily removed from the circuit
breaker for r ep lacement or for bench testing.
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I. Remove the two SCrews holding the terminal block
cover bearing the terminal numbers
1,2,3,4,7,8,9.
This exposes the terminal block that connects the
static trip device to the wiring on the breaker.
2. Loosen the seven screws in the bottom row of the
terminal block (it
is not necessary to remove the
screws completely) and slide
out the connecting
strip from under the screws.
3. Removing the connecting strip exposes one screw
just above the name "Stalic TripII"' on the face plate.
Remove this screw and slide the static trip unit out by
pulling it toward you.
4.
To install a unit, reverse steps 1-3. Be sure to tighten
all screws.
It is important to replace the terminal
block cover because it guards against accidental con-
tact with the live terminals. Also, the terminal num-
bers on
it arc helpful in testing.
Available Types
Nine types of SIalic Tripa devices are available. Similar
in many respects, they differ only in their specific appli-
cation. All use identical tripping transformer inputs and
provide output
sign31s to the tripping actuator. Several
types are shown in Figure I.
The type designation
is coded to indicate the functional
elements: T
,- LONG-TIME delay element, S =
SHORT-TIME delay element, I = INSTANTANEOUS
element, G ,= GROUND current element and (T) = a
TARGET which indicates when tripping is initiated by
the ground clement.
For each clement except INSTAN-
TANEOUS there are two adjustment knobs on the front
of the device. one for pick-up setting and one for delay
sctting. The instantaneous element has only one knob for
pick-up setting. See Figure
9. Following are briefdescrip-
tions of the nine types:
TYPE TI -A dual trip device normally used for phase
overcurrent protection. The long time pick-up range
is
selected from the trip rating table and is continuously
adjustable from
"A" thTU "G" in the field. The instan-
tancous element
is continuously field adjustable from 3
to
12 mUltiples of the long time pick-up setting selected.
The long time delay
is field adjustable with a choice of
six bands.
TYPE T1G (optional) - A dual trip dewice which pro-
vides phase overcurrent protection same as Type
TI plus
sensitive ground fault protection for 3-wlre and 4-wire
circuits on systems with either phase-to-phase
or phase-
to-neutral loading. Ground current pick-up settings are
indcpendent of the phase pick-up settings; and continu-
ously adjustable
in the field from 15% through 100%
of the tripping transformer rating. When used on 4-wire
circuits. a fourth tripping transformer
is required. It is
mounted in the cubicle, and wired to the breaker through
secondary disconnects.
TYPE T1G(T) (optional) -Same as Type TIG,
except a ground target
is provided to give a visual indi-
cation of a trip initiated
by a ground fault.
TYPE TS (optional) - A selective trip device used for
phase overcurrent protection which provides time delay
tripping only.
It allows complete field adjustment of the
long time band and pick-up plus the short time band
and pick-up.
The short time pick-up can be adjusted
from 3 to 12 multiples of the long time pick-up setting.
Anyone of the three short time bands can be chosen to
be used with any of the six long time bands.
TYPE TSG (optional) - A selective trip device which
provides phase overcurrent protection same as Type TS
plus sensitive ground fault protection for 3-wire and
4-wirc circuits on systems with either phase-to-phase or
phase-to-neutral loading. Ground current pick-up set-
tings arc independent of the phase pick-up settings, and
continuously adjustable
in the field from 15% through
100% of the tripping transformer rating. When used on
4-wire circuits, a fourth tripping transformer is required.
It is mounted in the cubicle, and wired to the breaker
through secondary disconnects.
TYPE TSG(T) (optional) -Same as Type TSG, ex-
cept a ground target
is provided to give a visual indica-
tion of a trip initiated
by a ground fault.
TYPE TSI (optional) - A triple selective trip device
used for phase overcurrent protection which provides
long time delay, short time delay, and instantaneous
elements.
It allows complete field adjustment of the long
time band and pick-up, the short time band and pick-up
and the instantaneous pick-up. Both the short time and
instantaneous clements
can be adjusted to pick up at 3
to
12 multiples of the long time pick-up setting. Anyone
of the three short time bands can be chosen to be used
with any of the six long time bands.
TYPE TSIG (optional) - A triple selective trip device
which provides phase overcurrent protection same
as'
Type TSI plus sensitive ground fault protection for
3-wire and 4-wire circuits on systems with either phase-
to-phase
or phase-to-neutral loading. Ground current
pick-up settings are independent of the phase pick-up set-
tings. and continuously adjustable in the field from IS%
through 100% of the tripping transformer rating. When
used
on 4-wire circuits, a fourth tripping transformer is
required. It is mounted in the cubicle, and wired to the
breaker through secondary disconnects.
TYPE TSIG(T) (optional) -Same as Type TSIG,
except a ground target is provided to give a visual indi-
cation of a trip initiated by a ground fault.
Time-Current Curves
";Figure 4 is a set of curves for the Static Trip a devices.
'The long-time element has a characteristic represented
by:

GROUND CURRENT IN PERCENT
Of TRiPPING XFMR RATING
IOOOP;~
I
.a
,4 ~-l-I-++-
OF TR IP PING XFMR RATING
•
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CURRENT IN MULTIPLES OF PICK-UP
2 4
LONG TIME CURVES (1)
o
)Q
1'000
aoo
600
LONG TlMf PICK-UP + ++1400
I _~~ . CONTI NUOUS LY AOJUSTA BL~ _ ._
14_+-tJlF'''''",::M~ 0.5 TO 1. 25 TI~:S ~aR~PPINf.:
XfMR RATING, WITH
POINlS PIC. n , aLI
.-~-++iTT --,--+--+-+~+4 -HH200
++-+ +140
10
a
~
0
z
\\\\M
0
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l\\~
2
~
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...
'IS
I
1,<
I ~
2 I
;0
100
CURRENT IN MULTIPLES Of PICK-UP
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Figure 4, -- SIalic Trip II Time-Current Curves
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K 1 .
tn = -
In
where tn =time delay, I = current expressed in multi-
ples
of the long-time pick-up, n is a constant dependent
on the circuit design (slightly over 2 for
STATIC TRIP
II), and K is a constant depending on the delay band
sele"",d. In other words, the delay for a given band
setting varies approximately inversely as the square at"
the current. When plotted on log-paper this relationship
is a straight line as shown by the sloping bands on Fignre
4. Six discrete long-time bands are available, anyone of
which may
be selected by the band control switch on the
front. Each band has a delay exactly twice the delay
of
the next lower band. ~
The short-time element bas adefinite delaywhich is inde-
pendent of current as shown
by the fact that the short-
time bands are horizontal on Figure
4. There are three
calibrated short-time delay bands -MINIMUM, IN-
TERMJlDIATE, and MAXIMUM which have nominal
delayiof 0.1, 0.25, and 0.45 seconds, respectively. How-
ever, short time delay
is continuouSly adjustable and can
be set at other values
if suitable testing equipment is
available.
,
The ground elementhas a definite delay characteristic
just like the short-time element and with the same cali-
brated points.
It is independently adjustable.
The width of the time bands on Fignre 4
is due princi-
pally to differences between devices caused
by normal
commercial tolerance of components in the circuits.
Repeated tests on
anyone unit will fall in a much nar-
rower band.
The band width also includes breaker interrupting time.
The upper limit represents the total clearing time includ-
ing breaker opening and arcing time, whereas tbe lower
limit
is the "resettable time" -the maximum time that
the overload can persist without tripping the circuit
breaker. This representation, which
is necessary to
demonstrate coordination between breakers set on
contiguous time bands, widens the SHORT TIME
bands significantly.
Performance In Service
Ambient conditions and length of service ",ill have little
effect on the performance of static overcurrent trip
devices. The circuits are stable and will show ."itcellent
repeatability over long periods of time. Service involving
frequent operations
will not cause the characteristics to
change
or drift, since there are no moving mechanical
parts to wear or bearings to lubricate
.
Static Trip II devices are tolerant of dusty conditions and
4
will function properly in many areas that would affect
the performance of electro-mechanical trip devices.
The temperature
at the static trip device does have some
effect onthe characteristics due to changes in response of
some of the components. However, the changes are
small and will not be a factor in most applications. Over
the range of
-40 C to 55 C (-40 F to 131 F), the
variation from performance at room temperature is very
small, amounting to less than 5%
of LONG TIME,
INSTANTANEOUS and SHORT TIME PICK-UP
values, and 10% in timing of all time bands. Operation
is not recommended beyond this range. If necessary,
control of the temperature should be provided
by heat-
ers or ventilation.
Connection Diagrams Figures 5 through 8 show in
schematic form the pre-wired connections from the
breaker mounted tripping transformers to the static trip
device. This wiring varies with the application. The four
most commonly used schemes are shown, and the dia-
grams with their captions are self-explanatory.
NOTE
For 4 wire systems with ground fault tripping
the neutral busCT or ground strap CT are
separate from the breaker and are connected
to the static trip through secondary drawout
contacts on the breaker. . .
~', .
SmlNGS
Static Trip II devices have a number of knobs and
switches that can be arranged to select specific load cur-
rent conditions that
will cause the breaker to open. Selec-
tion of settings
is usually made when the breaker is
placed in service to match anticipated load conditions
and coordination requirements. Future changes are un-
necessary unless load conditions change
or primary cir-
cuit changes are made.
POWER
TR ANSFORM[R
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1 ,
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1 2
-'
INTERNAL
TRANSFORMER
TRIPPING TRANSFORMERS
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BRKR. MTD.
A'.
-
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{"+
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3
0-
.A
CIRCUIT_Go
BREAKER
,.
STATIC
TRIP
DEVICE
+>-
..
PHASE
CONN.
TO
LOAD
Figure 5. -Breaker Wiring for Types Tl, TS, and
TSI (non ground)
I
1
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POWER
TRIPPING TRANSFORMERS
(
BRI(R. MTD.
TRANSFORMER
"
LA
~::t-;:-:N\:::I:-l~ C IRC U IT
02 BREAKER
PHASE
CONN.
TO
LOAD
7f.
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1:112 = ;==j'~3bttt:;~=~~
, 2 3 9
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, 2 3
STATIC
TRIP
DEVICE
GNO
Figure 6. -Breaker Wiring for Ground Protection on
3-Wire Systems, Residual Sensing
POWER
TRANSFORMER ."
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2
'3
N
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,, .,
,
i 1.. -Gl2
,
T~E~
NG
BRI<R. M
TRIPPI
TRANSFO RMERS
;;
;;
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STATIC TRIP I
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1: i•
DEVICE
,
LA CIRCUIT
BREAKER
I I I
'l' 'l' 'l'
N
~
CONN. TO LOAD
,
: 4 GND I
I
L ___________ ..J
NEUTRAL BUS
TRIPPING TRANSFORMER
Figure 7. -Breaker Wiring for Ground Protection
on 4-Wire Systems, Residual Sensing.
POWER
TRANSFO RMER
~
NO GROU
ST.
AP-
'NG
TRIPP
TRANSFO RMER
.' .2
..
N
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, 4
,
,
,
,
,
,
,
\~RKR. MTO
"RIPPING TRANSFORMERS
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- -
3 9
;-
I 2 3
GND.
6 ~
LA .~
~
CIRCUIT
BREAKER
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,
STATIC ,
,
TRIP ,
DEVICE I
,
,
,
CONN.
TO
LOAD
L ________
-
--
_ __ .1
Figure 8. -Break1t( .wiring for Ground Protection
on 4-Wire Systems. GJ:tJ/Uld Strap Current Sensing.
5
Figure 9 is an illustration of the type TSIG(T) device
which contains all Static Trip
II control options. The
following paragraphs discuss the calibration and use of
these controls.
LONG TIME PICK-UP has 7 calibration marks. The
black reference dot on this and aU other knobs marks
the fully CCW (counter clockwise) position of the con-
trol and enables calibration to
be restored if the knob
should inadvertently be turned on the shaft. (See the
section on Maintenance.)
When turning the knob in the clockwise (increase) direc-
tion from the black dot, the first red dot
is setting" A" in
the vertical column of letters A through G. The second
red dot
is setting "B", etc. The values of the settings in
amperes depend upon the tripping transformer rating
and are shown on the breaker rating plate (Fig.
2) just
above the static trip.
STATIC TRIP II
LONGTIME
DELAY IN SECS.
BAND
AT 6X PICKUP
1 1.12
2
2.25
3
4.5
4 9
5 18
6 36
IU:'" TO l.rAIlEII: RATI'"
~"Tr '011 CU,.,.,.1 .,AWEI A TO.
GROUND TARGET <.
TYPE TSIG(T)
LONGTIME
BAND
SEE
TA.LE
AT
Lm
, ..........
., ....
D TIME BAND
Figure 9. -Calibration Marks
DOT
1
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•
Figure lOis a table of settings in amperes for all the
standard tripping transformer ratings.
The tripping transformer rated secondary current is one
ampere. Because setting E, Figure 10 table corresponds
to rated tripping transformer current, one ampere input
to the static trip will cause it
to pick up and start timing
if
LONG TIME pick-up setting is on HE".
Example: Suppose it is desired that the breaker shall trip
whenever sustained current exceeds
600 amperes, and
suppose that the tripping transformer rating is 800
amperes. The LONG TIME pick-up setting should be
"C", Figure 10 table. At 600 amperes, current input to
the static trip will be 600 -: 800 = 0.75 ampere.
Long time pick-up control is continuous and other set-
tings between calibrated points may be used if suitable
test equipment is available.
INSTANTANEOUS PICK-UP has four calibrated
points,
3X, 5X, 8X, and 12X, calibrated in multiples of
the
LONG TIME pick-up setting. Again the black ref-
erence dot is at the fully counter-clockwise end of rota-
tion. Starting from the reference dot, the first red dot
,
Br.aker Long Time Element
when rotating clockwise (decrease) is the 12X point.
This control is also continuous, permitting field calibra-
tion of additional settings if suitable equipment is avail-
able. For special applications, settings as low as I.OX
can be field calibrated.
Example: Referring to the previous example, if LONG
TIME pickup is on "C" and INSTANTANEOUS pick-
up is on 5X, the breaker will trip instantaneously at 3000
amperes (5 x 600) or more.
SHORT TIME PICK-UP is calibrated just like instan-
taneous, and control is also continuous. 1t can also be
field calibrated as low as l.OX.
GROUND PICK-UP is calibrated in percent of the
tripping transformer rating with four calibrated points,
and is also continuous.
Example: If the tripping transformer rating is 600
amperes and GROUND PICK-UP is at 25 %, a ground
current of 150 amperes will cause
the ground circuit to
trigger.
If the ground current persists as long as the
Ma.
Ground Element TriPPi~g6
I)
Type and XFMR
Calibrated Pickup Settings Cont Calibrated Pickup
58"lng.
Rating
Frame
Si ..
(Primary) A B c D E F G
RaUng
15%
25% 50% 100%
80 40 50
60
70
80
90 100 100 --
40
80
LA-600 200 100 125 150 175 200
225
250 250 30 50 100 200
600 400 200 250 350 400 100 200 400
Amperes 300 450 500 500 60
600 300 375 450 525 600 675 750 600
90
150 300 600
200 100 125 150 175 200 225 250 250 -50 100 200
LA-1600 400 200 250 300 350 400 450 500 500 60 100 200 400
1600 800 400 500 600 800 1000 200 400 800
Amperes 700 900 1000 120
1600 800 1000 1200
i400
1600 1800 2000 1600 240 400 800
1600
LA-3000
2000 1000 1250 1500 1750 2000 2250 2500 2500 300 500 1000 2000
3000 3200
1600 2000 2400 2800 3200 3600 480 800 1600 3200
Amperes 4000 3000
LA-4000
4000 4000 2000 2500 3000 3500 4000 4500 5000 4000 600 1000 2000 4000
Amperes
Figure 10. -Static Trip II Rating Table -Amperes.
GENERAL NOTES
1. The "Tripping XFMR Rating" values represent the
primary value of the current transformer ratio in am-
peres. The secondary value is one ampere.
2.
The pick-up settings of the long time element are
continuously adjustable, and are calibrated at points
"A" thru "G" as shown in the rating table.
3.
The pick-up settings of the instantaneous and short
time delay elements are continuously adjustable, and
are calibrated at 3, 5, 8 and 12 multiples of the long
time pick-up setting.
4.
The pick-up settings of the ground element are con-
tinuously adjustable, and are calibrated in percent of
the tripping transformer rating as shown in the rating
table.
5. The long time element has 6 bands that are field selec-
6
table. The time delay at 6 multiples of pickup is as
follows:
Band 1 -1.12 seconds
Band 2 - 2.25 seconds
Band 3 -
4.5 seconds
Band 4 - 9 seconds
Band 5 - 18
seconds
Band 6 - 36 seconds
6. The short time element and ground element have 3 time
delay bands which are calibrated at minimum, inter-
mediate and maximum, but are continuously adjustable.
7. The maximum interrupting time is the maximum length
of time that fault current flows, including arcing time.
8. Instantaneous maximum interrupting time may be
greater
when breakers are closed in on a fault depending
on aftual fault conditions. The maximum potential
increase for a 3-phase fault is 0.01 seconds and for a
single-phase
ground fault is 0.02 seconds.
j

GROUN 0 TIME BAND setting, the breaker will trip,
and
if there is a ground target, the red plunger will pop
out.
The target is reset by pushing it back in so that the
permanent magnet holds it in the reset position.
As explained previously, the tripping transformer sec-
ondary current rating is 1.0 ampere so the ground CUf-
rent input currents to the static trip device at pick-up
are the same as the calibration value divided by 100.
(E.G.: when set on 25 %, pick-up current is 25% of 1.0
ampere,
or 0.25 ampere.)
Time Bands
There arc six LONG TIME BANDS numbered I
through 6, and three SHORT TIME BANDS marked
MAXIMUM, INTERMEDIATE, and MINIMUM.
The GROUND TIME BANDS on devices with ground
trip are the same as the short time bands, but are inde-
pendently adjustable.
The control for selecting the LONG TIME BAND is a
very small switch and the detent is not strong. There-
fore, be very careful that the white dot on the knob
lines up with the desired number.
All the LONG TIME, SHORT TIME and GROUND
TIME bands are shown on the TIME CURRENT
CHARACTERISTICS curve, Figure 4. The curve sheet
is self-explanatory. In addition, a table printed on the
face plates of Slatic Trip
II units lists the time delay at
six times pick-up current for each
LONG TIME band.
The delay for each band is twice the delay of the next
lower band.
The SHORT TIME and GROUND TIME band con-
trols are continuous so that settings other than factory
calibrations may be used if suitable testing equipment
is available.
TESTING
General
STA TIC TRIP n can be field tested either with primary
current through the breaker
or with secondary current
applicd directly to the static trip device. The ease of
testing with secondary current is onc of the advantages
of static trip devices. With comparatively inexpensive
and readily available equipment, described in the fol-
lowin
g, it is possible to demonstrate that the tripping sys-
tem will open the breaker, and to verify that the device
,
,
Figure 11. -Testing with Portable Test Set
7
conforms to the published time-current curves. How-
ever field testing cannot be expected to be as accurate as
factory calibration. Therefore, slight discrepancies be-
tween
fie ld tests and factory calibration marks can be
regarded as normal.
If large deviations or improper oper-
ation should occur, it is recommended that the nearest
Allis-Chalmers office be contacted for advice.
S econ d ary Curre nt T es ting
A portable test se t is available for secondary testing that
is designed to plug into a standard 115volt outlet,Figure
II . With this test set, Static Trip II can be tested by itself
without a circuit breaker, or on a circuit breaker with
the breaker away from
th e cubicle, or inside the cubicle
in the TEST or DISCONNECT position.
CAUTION
The static trip input is capacitively coupled to
the circuit breaker
frame , through a surge ca-
pacitor. Therefore to insure against electrical
shocks be sure to ground the
frame when testing
with the circuit breaker
out of the cubicle.
There is a terminal block on the circuit breaker just
above the trip device. This terminal block accepts leads
with banana plugs when testing with the device on the
breaker. Such leads are furnished with portable test sets
purchased after March 1972.
•
•
•

•
•
•
Connections for the test set are shown in Figure 12. If
test leads with banana plugs are not available, connec-
tionscan be made with small alligator clips after remov-
ing the terminal block cover bearing the numbers I,
2,
3, 4, 7, 8, 9.
CAUTION
Avoid even a momentary short circuit between
terminals 4 and 7 or terminals 8 and 9. Such a
short cirCUit, with any input current to the trip
device, will damage it.
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Octc(ctZ u:::> 0
j:rrr=>o i=c.:E
ctG..G..G.. <I-:E
GREEN ~<a:lU~ Ina 8
BANANA ,.......-=""= .............
PLUG 'Wi 2 ~ 4 7 § 9 I
FROM ( .2.'i9 ?Y 'i'
TEST SET /
WHITE
BANANA
PLUG
-
TP3
TP,
TP'
:
TO TEST seT TERM 8 -
RED PLUG
TO TEST SET TERM 7-
BLACK PLUG
TO VM POSITIVE FOR
LONG TIME TRIGGER
TO VM POSITIVE fOR
SHORT TIME TRIGGER
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TOVMNEG
FOR TRIGG
TESTS
BLACK
TIP
ER
TP2
~
TO VM POSITIVE FOR ~
GROUND TRIGGER TEST ~
PLUG
Figure 12. -Testing with Portable Test Set,
Connection Diagram
Be careful to make connections correctly as shown on
Figure
12. There is a terminal marker strip above the
terminal block which can be seen although it is partly
covered by wiring.
When testing with the Static Trip II device off the
circuit breaker connections must be made to the
spade type terminals of the connecting strip. Mak-
ing
these connections with clip leads involves the
risk of shorting between clips which can damage
the trip device. A terminal block assembly,
18-657-506-585 and special leads, 18-657-489-852
are available for making the connections to old
model test sets. The terminal block assembly ac-
cepts the connecting strip just like the one on the
circuit breaker and the leads are designed to make
connections from the test set to the jacks on the
terminal block.
8
Late model test sets have a terminal block on them
just like the one on the circuit breaker. In that case
it is only necessary to connect the static trip con-
necting
strip to this terminal block and make con-
nections with the banana plugs just as if the unit
were mounted on a breaker.
Test points, TP1, TP2, TP3, and TP4 are on the
Static Trip II face plate. They are for connection
to a dc voltmeter of 25 to 50 volts full scale, to
observe triggering (pick-up). The portable test set
contains such a voltmeter. TP1 is common nega-
tive, TP3 is
the LONG TIME trigger, TP4 is the
SHORT TIME TRIGGER, and TP2 is the
GROUND trigger. These test points are designed to
accept standard tip plugs which are furnished with
the portable test set. However, if tip plugs are not
available, any solid metal wire, nail, or pin of O.D.
.080 ± .002 inches may be used to make the con-
nection. A number 46 or 47 twist drill is satisfac-
tory. See Figure 12 for connections.
Detailed test instructions are given in the portable
test set instruction book. Instruction books for test
sets purchased prior to 1973 were written for older
style static trip devices, not for STATIC TRIP II.
However,
with the information contained in this
book, the necessary changes in test procedure
when testing STATIC TRIP II units are easily
understood. One difference that should be noted is
that STATIC TRIP II has two more LONG TIME
PICK-UP points than older static trips. The LONG
TIME pick-up current values for secondary testing
are given in Table I below.
TABLE I
LONG TIME
PICK-UP SF,rING
A H C D E F G
PICK-l!P
CURRENT. AMPS .50 .6~5 .75 .X75 1.00 1. 125 1.25
Testing Without a Portable Test Set
The portable test set has its own automatic timer
which permits accurate testing of all time delays. If
the test set is not available, however, it is possible
to perform function tests and some timing tests if
the following equipment is available.
I. One variable transformer (Variac) 115 or 120 volt,
60 Hertz. 2.5 amperes minimum.
2. One air core reactor, 30 to 50 milli-Henries. 2
amperes minimum. Maximum dc resistance -20
Ohms.
3. One ac ammeter, 0-1 or 0-2 amperes -necessary for
accurate checking of LONG TIME PICK-UP.
4. One ac ammeter. 0-5 amperes, for LONG TIME

delay tests and INSTANTANEOUS and SHORT
TIME pick-ups.
5. One dc voltmeter, 0-25
or 0-50 volts, for trigger
indication.
6. One stop watch, desirable but
not essential, for tim-
ing tests.
7. One single pole -single throw, snap action switch
rated 120 volts,S amperes ac
or more.
TO
11511,60Hz
OUTLET
SWITCH
SPST
120 v. AC
5'.
AIR CORE
REACTOR
) 30 MH MIN
-
VARIABLE
TRANSF.
12011., 2,5A.
The sudden appearance of this "trigger" voltage indi-
cates that the timed delay has started.
If the current
drops slightly, causing the trigger voltage to disappear,
the timing circuit resets instantly and timing will restart
upon the next appearance
of triggering.
Short Time Pick-up Test
Use the 0-5 ampere ammeter and connect the voltmeter
to terminals
TPI and TP4 with TPI negative. Set LONG
~
~ ~
~ ~ ~
..
~
~ ~
~
~
..
.. ..
..
i ;0
~
~ ~
i " ci
~ ~
~
.. .. .. 0 0
'"
0
4
'"
u " , + u
.. 34 H?
o 0 0 0
J.. _.L-_J
. t-r==~~~;;~~~~~ TO 11M FOR
MM. ~} TIMING TESTS
W/O BREAKER
STATIC LFOR LONG TIME
STRIP n TP3 TRIGGER TEST
er--- -- .....
fOR SHORT
TP4.l I TIME TRIGGER
@- __ ~ ___ ""\ I TEST
, I
TPI
~
- + I
~ __________ L- ________________ ~
TP2
I}-
VM I
,
___ ,, ______ J
\... --FOR GROUND
TRIGGER TEST
Figure 13. -Secondary Testing Without Test Set
Test Connections
Sec Figure 13 for test connections. Connect the input to
terminals I and 9 to test A phase,
to 2 and 9 for B
phase, 3 and 9 for C phase, and 4 and 9 to test the
ground circuit on devices with ground current tripping.
Long Time Pick-up Test
For this test a circuit breaker is not needed. 'If the static
trip is mounted
on a breaker, it is not necessary to close
the breaker.
Usc the 0-1 or 0-2 ampere ammeter. Connect the volt- !
meter to terminals TP I and TP3 with TP I negative.
Refer to "Secondary Current Testing" for tips and cau-
Lions on making connections.
Set LONG TIME PICK-UP on "A". Raise the current
gradually until the voltmeter needle jumps suddenly to
15 volts or morc. The current at which this occurs should
be 0.5 ampere
~ 10%. Decreasing the current slightly
should cause the voltmeter reading to
drop to a low
vallie. Repeat for the other
LONG TIME PICK-UP
settings mId compare with Table I.
9
TIME PICK-UP on A and SHORT TIME PICK-UP
on 3X. Raise the current until the voltmeter suddenly
jumps
up as before. This should occur at 1.5 amperes
(3 x
0.5). Repeat for SHORT TIME PICK-UP settings
of
5X and 8X which should give readings of 2.5 and 4.0
amperes respectively, (5 x 0.5 and 8 x 0.5). You may
not be able to get the 6.0 amperes for the 12X setting
even with the variable transformer
at maximum output.
CAUTION
Do not allow current above 2 amperes to con-
tinue more than a minute or so at a time so as
not to overheat the statiC trip, the variable trans-
former and the reactor.
Ground Pick-up Test
Ground pick-up cannot be checked accurately with this
equipment because of excessive current wave distortion
caused by the highly non-linear impedance of the static
trip ground circuit. However. it
is possible to verify that
the circuit
is operating and that pick-up is somewhere
near the right value.
•
•
•

·.
•
•
•
Use the 0-1 ampere ammeter and connect the vo~ter
from TP I to TP2 with TP I negative. Set GR'OUND
PICK-UP on
15 % and gradually increase input current
until the voltmeter jumps up. Input current should be
somewhere near 0.15 ampere. Repeat for the other set-
tings. Each setting should give a reading in amperes
nearly equal
to the calibration value divided by 100
(100% = 1.0 ampere).
Instantaneous Trip Test
There is no trigger output for INSTANTANEOUS. but
tripping of the breaker will indicate operation when
testing with the static trip unit
on a breaker. When test-
ing wit~out a circuit breaker, connect the voltmeter from
terminal 7 to terminal 8 with 7 negative to monitor the
trip device output.
Use the 0-5 ampere ammeter. Set LONG TIME PICK-
UP on
"A" and INSTANTANEOUS on 3X. Gradually
increase current until the voltmeter indication jumps up
to
15 volts or more indicating that the instantaneous cir~
cuit has caused a tripping output. This should occur at
about
1.5 amperes (3 x 0.5). Repeat for the 5X and 8X
INSTANTANEOUS PICK-UP settings which should
cause operation at 2.5 and 4.0 amperes respectively.
NOTE
Because of the load imposed by the actuator coil,
the voltmeter indication will be much less, perhaps
as low as 5 volts, if the static trip output, (7-8) is
connected to a circuit breaker.
Long Time Delay Test
For currents less than 6 times pick-up setting and time
bands 2 and higher. the delay
is long enough to be
checked fairly
well with a stop watch or even an ordi-
nary watch having a sweep second hand.
Use the 0-5 ampere ammeter.
I. Close the switch and adjust current
to the desired
value.
2. Open the switch and close the circuit breaker.
3. Without changing the variable transformer setting,
close the switch and measure the time interval from
switch closing to breaker tripping.
Example: Set LONG TIME PICK-UP on "A," LONG
TIME BAND on 5, input current at 3.0 amperes (6 x
0.5). Set SHORT TIME and/or INSTANTANEOUS
pick-up on 12X, above the input current value. The
timed interval should be between
14 and 22 seconds. See
the curves
on Figure 4.
10
If the static trip is not mounted on a circuit breaker,
connect the voltmeter across terminals 7 and 8 of the
static trip and time the interval from switch closing to
voltmeter indication.
NOTE
While timing out at values of input current not
much above pick-up, normal fluctuations
in supply
voltage may cause the device to de-trigger (see the
last paragraph under "Long Time Pick-Up Test")
and prevent the device from timing out properly.
To avoid this
it is desirable to monitor LONG
TlME trigger output with a voltmeter throughout
the test.
Short Time Delay Test
The SHORT TIME delays are too short (0.5 second
maximum) to be checked without a high speed auto-
matic timer, but
it is possible to perform a test to verify
that the short time circuit will trip the breaker. To do
this follow the instructions for testing INSTANTANE-
OUS
as described previously, but set the INSTAN-
TANEOUS, if there is one, above the input current level
and the
SHORT TIME PICK-UP below the input cur-
rent level.
Example: Set LONG TIME PICK-UP on "A", SHORT
TIME PICK-UP at 3X (J.5A.), and INSTANTANE-
OUS (if applicable) on 12X
(6.0A.). Close the breaker
and apply 2 to 5 amperes
by closing the switch. The
breaker should trip
in about liz second or less depending
on the
SHORT TIME BAND setting. If the static trip
is not on a breaker, the voltmeter may be used as before
to obtain an indication
of the static trip output at termi-
nals 7 and 8.
Ground Time Delay Test
The GROUND time delay can be tested in the same way
as the SHORT TIME except current is applied to termi-
nals 4 and 9 instead of I, 2, or 3 and 9. When the trip-
ping output appears, the ground target should pop out.
Tripping Actuator Test
If the static trip device fails to trip the breaker. the
question arises as to whether the trouble is in the static
trip or the actuator. Substitution
of another static trip
may supply a quick answer.
If another static trip is not available, there is a simple
t~st of the actuator. However. a dc power supply with
output adjustable from three to
12 volts minimum at 0.3
ampere minimum is required. Such a power supply is
contained in portable test sets built after late 1972.

Disconnect the static trip connecting strip from the ter-
minal block. With an ohmmeter or resistance bridge mea-
sure and record the resistance of the actuator coil from
terminal 7 to terminal 8 of the terminal block.
Disconnect the ohmmeter and connect the output of the
power supply to terminals 7 and 8 of the terminal block
with terminal 7 negative. Close the breaker and slowly
increase the de voltage from minimum. Note and record
the voltage atwhich the breaker trips.
There are two types of actuators which have dif-
ferent coil resistances. If coil resistance is between
25 and 30 Ohms, the tripping voltage should not
be over six volts. If resistance is between 30 and
40 Ohms tripping voltage should not be over 10
volts. Values above these indicate defective trip-
ping actuators.
CAUTION
Although the tripping actuator can be easily dis-
assembled, doing so may partially demagnetize
it, and remagnetizing requires special equipment.
Failure of the breaker to trip at any actuator voltage
even up to
12 volts may be due to the plunger of the
actuator not being reset fully so that the permanent mag-
net does not hold
it in the reset position. This can be
checked visually.
See the circuit breaker instruction
book.
Tripping Transformer Tests
The tests described in the preceding verify performance
of the static trip device and the tripping actuator.
The third link in the STATIC
TRIP IT protection sys-
tem
is the breaker-moonted tripping current trans-
formers. When secondary current testing is done with
the static trip on the breaker. the tripping transformers
are subjected to approximately their normal excitation
so that a transformer with shorted turns would show
up
in the form of pick-up values above tolerance. How-
ever, there would
be no way of knowing whether the
problem was in the static trip or the transformers. More-
over, an open circuit in the transformer winding or
wiring would not show up at all. Therefore, it is desirable
to test the tripping transformers as described
in the
following:
Connections
If the static trip device is on the breaker. disconnect it
from the transformers by removing the connecting strip
from the lower row of terminal block connections. The
tripping transformers can now be tested by making con-
.~
11
nections to the banana jacks of the terminal block just
as before.
Continuity Check
An ohmmeter is most suitable for checking continuity of
the transformer secondary windings and wiring. Con-
nect the ohmmeter to terminals 1 and 9 for A phase, 2
and 9 for B phase, and 3 and 9 for C phase. The value
of the resistance (which can fall within a wide range
depending on the transformer rating)
is not important
for this test because the purpose
is solely to verify con-
tinuity.
When ground protection
is provided, the ground strap
transformer or neutral bus transformer, whichever is
used, is mounted external to the circuit breaker and
wired to the static trip terminal block through secondary
draw-out contacts of the cubicle. Therefore, to check
continuity of this tripping transformer and its secondary
circuit, the breaker must be in the cubicle in the
TEST
or CONNECTED positions. Connect the ohmmeter be-
tween terminals 4 and 9 to check the ground strap
or
neutral CT continuity.
Excitation Test
The purpose of the excitation test is to reveal shorted
turns
in the tripping transformer winding. Sixty-Hertz
ac voltage
is applied to the secondary winding and the
exciting current
is monitored. Short circuited turns will
be revealed by excessive exciting current and perhaps
by overheating of the winding. If a portable test set is
available, it may be used to furnish the applied voltage,
and the ammeter on the set may be used to monitor
exciting current.
It is desirable, but not essential, to also
have an
ac voltmeter of 0-150 volts scale to measure
the applied voltage. Many multitesters have such a volt-
meter range as well as an ohmmeter range for continuity
tests. In the absence of a voltmeter, the dial reading of
the variable transformer may be used as an approximate
voltage indicator. See Table IL
If a portable test set is
not available, the equipment listed under "Testing
Without a Portable Test Set" can be used.
Again, each phase must
be tested in tum. Connect the ac
supply to terminals 1 and 9 for A phase, 2 and 9 for
B phase, and 3
and 9 for C phase. To test the ground
strap
or neutral bus CT for ground protected systems,
it is necessary for the breaker to be in the TEST or
CONNECTED position in the cubicle, as explained
before, and apply voltage
to terminals 4 and 9.
Table
IT gives applied voltage and test limits of exciting
current for all the standard tripping transformer ratings.
The figure .02 ampere
in the table is used because that
is about the lowest readable current on the test set am-
•
•
•

.-
•
•
•
meter, and transformers that meet this limit will give
satisfactory performance. Normal exciting current for
the 800: I and up ratings may be well below this value.
Therefore,
it is essential, for ratings of 1000: I and
higher, to perform the continuity check. On the lower
ratings the continuity check can be omitted since the
deflection
of the ammeter verifies continuity.
TABLE II
TRIPPING TRANSFORMER
EXCITING CURRENT TEST
APPROX.
I RIPPING VARIABLE MAXIMUM
TRANSF. APPLIED
TRANSF. EXCITING
RATING
VOLTS
SF'nlNG CURRENT
80: I 33.5 25 0.25
150: I 67
50
0.15
200: I 67
50 0.15
250: I 67
50
0.15
400: 1 67
50
.05
600: I 134 100 .05
800: 1 134 100 .03
1000 and
Up 134 100 <.02
Primary Current Testing
Testing with primary current applied to the circuit
breaker requires a low voltage, high current supply
that can deliver currents up to 4 or 6 times the sen-
sor transformer rated current.
Available high current, low voltage test sets are
single phase, so
that tests must be made one break-
er pole at a time as shown in Figure 14. When test-
ing a breaker having ground current protection
(Le. equipped with any STATIC TRIP II with the
letter G in its type designation) this single phase in-
put wiII appear to the static trip device to be
ground current. Therefore, when testing the LONG
TIME, SHORT TIME, and INSTANTANEOUS cir-
cuits, it is necessary to by-pass the ground trip ele-
ment by placing a jumper from terminal 4 to ter-
minal 9 of the static trip. To test the G RO UND
trip circuit this jumper should be removed.
Primary
current testing can provide the ultimate as-
surance that the entire protective system is func-
tioning properly since the entire system is tested at
one time. However, primary current testing may
present additional problems. One major difficultly
arises
from the non-linear impedance of the static
trip power supply circuit. The transformers that
supply power to the static trip circuit are designed
to saturate to limit the input to an acceptable level.
12
( A
-
TRIPPING
TR.SF.'S
)
1
B
)
-
)
TO HIGH
CUR. SOURCE
C
-
-)
Figure 14. -Primary Current Testing
When supplied from a low voltage source that can-
not provide a pure sine wave of current, the wave·
shape supplied to the static trip will be· altered.
This results
in either insufficient power to prop-
erly operate the static trip device or it may effect
the indication of the source ammeter, depending
on the ammeter design, leading to the erroneous
assumption that the trip device calibration is in-
correct.
One other major difficulty with primary current
testing is related to the duty cycle limitation of the
circuit breaker and sensor transformers. A properly
operating tripping system will be self protecting
from thermal damage up to the circuit breaker
short time and interruption rating provided that
the duty cycle applicable for each rating is not ex-
ceeded. The standard duty cycle for the short time
rating as demonstrated per ANSI C37.50 is 0.5 sec-
onds ON, 15 seconds OFF followed by a second
ON time of 0.5 seconds. The ON intervals generally
are
too short in time to read the ammeter for the
current source. For the instantaneous interruption
rating, the ON times are reduced to 50 milli-
seconds. Because of this, calibration of the trip
device high range settings cannot be accurately
done with primary current. The calibration can be

verified safely at the lower settings and operation
only verified at the higher set points.
If the duty cycle limits are exceeded during testing,
the circuit breaker or sensing transformers may be
damaged. Between tests, the unit must remain OFF
long enough to allow the sensor transformers to
cool. In addition, if there were a fault in the trip-
ping system
and the breaker could not trip within
its rated time limits, the system would not be self
protecting.
Therefore
to properly protect the tripping system
from
potential damage and still assure operation,
the following procedure is recommended.
1. Apply to one phase of the circuit breaker an in-
put current of one-half sensor transformer rating
and measure the trip device power supply volt-
age. This voltage
is across the filter capacitor
from its negative terminal to the red actuator
lead. If this voltage exceeds 18 volts, the distor-
tion of the input current can be disregarded ex-
cept for its effect on the ammeter reading. Test
all three poles of the circuit breaker in the same
manner. This establishes
that the device power
circuits are operating.
2.
Set the long time pick-up control to the "A" po-
sition, slowly increase
the current from zero
while watching
the long time trigger output.
Pick-up should occur at one-half the sensor
transformer rating plus or minus 10% not in-
cluding
ammeter error. Pick-up is indicated by
a sudden increase in the trigger voltage. Repeat
for all three poles of the circuit breaker. When
the trigger is present, the long time circuit tim-
ing oscillator
is released and the device will time
out on long time. Repeat calibration check on
the other long time pick-up calibration points if
desired.
3.
Set long time pick-up on "A", long time band
control on Band one (if adjustable), instantan-
eous
and short time pick-up on 12X, and the in-
put current equal to the sensor transformer rat-
ing. Remove and reapply power. Allow
the de-
vice
to time out and trip the breaker. The time
to trip should meet the published curves for the
device being tested. Repeat for all long time
bands. Note that if the input current waveshape
is distorted, the time delay may be less than ex-
pected. Some newer primary current test sets
have
peak responding ammeter circuits that will
properly indicate current magnitude when wave-
shape
distortion is present.
.13
4. Set instantaneous at 3X, short time at 12X, long
time band on its maximum (if adjustable). The
breaker should trip instantaneously at 1.5 times
the sensor rated current. Repeat for all three
poles of the breaker.
5.
Set short time pick-up at 3X, instantaneous at
12X, long time band on its maximum (if adjust-
able), and
short time band on minimum. Slowly
increase current. The breaker should trip on
short time at 1.5 times the sensor rated current.
The short time "time delay" can allow the cur-
rent to increase after tripping has been initi-
ated, so the rate at which the current is increas-
ed must be limited to prevent "over shoot".
6. With the same settings as in Step 5, adjust the
supply current to 3 times the sensor transformer
rating. Apply the current and observe the break-
er tripping time. Test all three short time bands
and verify that the short time delay matches the
published curves.
7. Increase
the instantaneous and short time pick-
up controls to their maximum and set the long
time band on minimum (if adjustable). Adjust
the supply current to twice the sensing trans-
former rating. Apply the current and observe
the breaker tripping time. Test at the same cur-
rent for all time bands, if bands are adjustable,
and verify that the long time delay matches the
published curves. Other values of current can be
tested if over heating is prevented.
8.
To demonstrate operation at normal control
setting, reset all controls to their desired condi-
tion, set current to a value high enough to de-
finitely cause tripping, apply
current, and verify
that tripping occurs.
•
•
•
•

•
•
•
REPAIR
B eca use of the co mplexity of so me of the semi -co ndu c-
tor components, for example, (he integrated circuit s. we
do not recommend field repair of STATIC TR IP IT
unit s. Mo re ove r. component fa ilur e usually docs not
sh ow up as vis ual dama ge ~ md l ocat in g the defective
compo n cnr or components requ ire s specia li zed t ech-
niques. Therefore. if the tests de~cribcd in the preceding
section indicate that a STAT IC TR IP II device is defec-
tive. contact yo ur Allis-Chalmers repr ese nt a ti ve for in-
"tructions on returning the unit 10 th e factory for repair.
MAINTENANCE
Each trip device is adjusted. ca librated, and tested
before shipment. It
is ready for use after the appropriate
settings have been
se lected.
Bec ause there a re no m ov ing parts. no readjusting, lub-
ric a tin g, et c. is req uir ed. The o nly maintenance th at is
required is periodic verification that the device is func-
tionin g. This may be sup pl emented as desired by check-
in g th e calibration, inspecting for l oose or br oken c ~ter
nal wiring. restoring l ost calibralion, and where unusu-
a
ll y dusty conditions ex is t, pe ri odic cleaning.
Rest or ing Lost Calib ration
Calibra ti on of the trip device depends on the knobs
being properly oriented on their shaft
s. If the knobs are
forced
by turning past the s top s, ca li bration will be lost
but can readily be restored.
A knob
wi ll be in proper calibration if , when tumed
counterclo ckwise as far as it ca n go, th e pointer lines up
precisely with the black reference dot on the dial. Refer
to Figure 9. If the above check shows the ca li bration 10
be in error, remove the kn ob by l oose ning it s sct screw
and slipping it off the shaft. Th en turn the shaft counter-
clockwise as f
ar as it wi ll go. K eep the shaft in th at
position and replace [he knob so th at it is directly ove r
the bl ack reference dot and tighten the set screw. Th e
LONG TIME BAND control kn ob h as no stop. and
the kn ob is keyed with a set sc rew to a nat on the shaf t.
If th e set scr ew should loosen. it is o nl y necessa ry to
verify that the set screw is lined up with the shaft flat,
and retighten the screw.
Cleaning
All the components in STAT IC TRIP II except the
ground target are seaJed against dust. and the in s u1ati on
integrity of the printed ci rcuit boards is protected by a
va rni sh coating. H owever , in ex tremely dusty atmo-
sp heres, enough dust may in time acc umuJate to pr eve nt
ade qu ate COOli ng of component s. STATIC TRIP II units
are easily disassembled for cleaning. Remov
in g one hex-
head, se
lf -threading screw at the top and one at the
bottom a
ll ows removal of the ri ght side cover of the
case. Th e two modules consisting of the two printed cir-
cuit boards with front and back pl ates can then be slid
out from the U-shaped sheet metal piece that forms
the left side and top and bottom of the case.
The two
modules are held together mechanical
ly by several
banana plugs w hi ch also serve as electrical connections.
To sep ar ate the modules, carefu ll y pull them apart so
that all the plugs disengage as equally
as possible. A
small rocking motion is helpful. Pulling one side out
whi le the other remains engaged wi ll damage the banana
plugs.
With the mod
ul es apart. Figure 15 , all components are
exposed for cleaning. Cleaning can be done with a very
soft brush or with compressed a ir. In the latter case , be
s
ur e the a ir is cI~Jn and dry and that the jet is not too
strong.
FiliUre J 5. -Sialic Trip II Disassemhled
14

INSTRUCTION BOOK REFERENCES
Type LA-600 & LA-600F (M_O. or E.O.) Circuit Breaker ....................................... 18X4581
Renewal Parts Ordering Guide for LA-600
................................................. 18X4558
Type LA-1600 & LA-1600F (M.O.
or E.O.) ....................... _ ........................ 18X4582
Renewal Parts Ordering Guide for LA-1600
................................................ 18X4559
Type LA-3000, LA-4000 & LA-4000F (E.O.)
............................................... 18X4583
Renewal Parts Ordering Guide for LA-3000 & LA-4000
........................................ 18X4560
Static Overcurrent Trip Device
(I) ....................................................... 18X4392
Static Overcurrent Trip Device (11) ...................................................... 18X4827
Description
of Operation -Static Overcurrent Trip Device (11) ................................... 18X4814
Time Current Characteristics -Static Trip
11 ......................... _ ..................... 18C2099
Types LA-600A & LA-1600A (Unfused) M.O. or E.O. Circuit Breaker and
Types LAF-600A & LAF-1600A (Fused) M.O. or E.O. Circuit Breaker
............................ 18X5214
Renewal Parts for LA-600A & LA-1600A, LAF-600A and LAF-1600A
....... _ ...................... 18X5215
Portable Test Set Type
PTS-1 for Static Trip I (Models A, AG, C, D & DG) ........................... 18X4589
Portable Test Set Type
PTS-1 for Static Trip 11 .............................................. 18X5322
Portable Test Set Type PTS-2 for Static Trip
II ............................................ 18X4955-02
STATIC TRIP
11 is a registered trademark of Siemens-Allis.
SIEMENS-ALLIS
Switchgear Division
P. O. Box 14505
West Allis, Wisconsin 53214
414
475·3600
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