Cooper Power Systems GV Technical specifications

These instructions do not claim to cover all details or variations in the equipment, procedure, or process described, nor to provide direction for
meeting every possible contingency during installation, operation, or maintenance. When additional information is desired to satisfy a problem not
covered sufficiently for the user’s purpose, please contact your Cooper Power Systems representative.
Figure 1.
Type GV sectionalizer.
September 1995 ● Supersedes 12/87
Sectionalizers
Type GV
Maintenance Instructions
1
87909KMA
Cooper Power Systems
S270-20-2
Service Information
CONTENTS
Introduction ....................................................................... 1
Description and Operation ............................................... 2
General ............................................................................. 2
Ratings ............................................................................... 2
Basic Sectionalizer Ratings .............................................. 2
Operating Data ................................................................. 2
Description of Operation .................................................. 2
Electronic Control Circuit ................................................ 2
Actuator Mechanism Operation ...................................... 4
Maintenance....................................................................... 5
Frequency of Maintenance ............................................... 5
Oil Condition ..................................................................... 5
Insulation Level Withstand Tests ...................................... 6
Test Procedures and Troubleshooting ........................... 6
Test Circuit and Equipment ............................................... 6
Test Procedures ................................................................ 6
Minimum Actuating Current ............................................ 6
Phase Minimum Actuating Current ................................. 6
Ground Minimum Actuating Current ............................... 7
Count Restraint .............................................................. 7
Voltage Restraint ............................................................ 7
(Serial No. 1302 and above)
Number of Counts-to-Open . . . . . . . . . . . . . . . . . . . . . . 7
Count Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Inrush-Current Restraint . . . . . . . . . . . . . . . . . . . . . . . . 8
Post-Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Shop Maintenance Procedures . . . . . . . . . . . . . . . . . . . . 10
Bushings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Moving and Stationary Contacts . . . . . . . . . . . . . . . . . . 10
Contact Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Contact Rod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Contact Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Current Transformers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Continuity Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Ratio Test for Sensing CT’s . . . . . . . . . . . . . . . . . . . . . . 14
Polarity Test for Sensing CT’s . . . . . . . . . . . . . . . . . . . . 14
CT Protection Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Service Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Bushing Parts and Contact Assemblies (Figure 23) . . . . . 15
Head and Tank Assemblies (Figure 24) . . . . . . . . . . . . . . 16
Operating Mechanism (Figure 25a) . . . . . . . . . . . . . . . . . 18
Operating Mechanism (Figure 25b) . . . . . . . . . . . . . . . . . 20
INTRODUCTlON
Service Information S270-20-2 covers maintenance instructions
for the Type GV electronically controlled three-phase sectional-
izer. It covers—in separate sections—a general description of
the unit, a detailed description of operation (both electronic
and mechanical), instructions for periodic inspection and main-
tenance, testing and troubleshooting, and shop repairs. In addi-
tion, service parts lists keyed to exploded-view drawings of the
various sectionalizer parts groups are included in the back of
this manual.

2
Type GWV Maintenance Instructions
DESCRIPTION AND OPERATION
General
The sectionalizer is a self-contained, circuit-opening device
used in conjunction with source-side protective devices, such
as reclosers or reclosing circuit-breakers, to automatically iso-
late faulted sections of electrical distribution systems. The sec-
tionalizer senses current flow above a preset level, and when
the source-side protective device opens to deenergize the cir-
cuit, the sectionalizer counts the overcurrent interruption.
Depending upon the coordination scheme, the sectionalizer
will open during the first, second, or third open interval of the
fault interrupting device to isolate permanent faults and confine
outages to smaller sections of line.
The sectionalizer does not interrupt fault current but can be
closed into a faulted line. It opens during the open interval of
the backup device. For this reason, it must always be used in
series with a fault-interrupting, backup protective reclosing
device. Also, it will forget counts that do not reach the counts-
to-open setting within the selected reset time due to clearing of
temporary faults.
When properly applied, the sectionalizer will respond to
downline fault currents that are interrupted by its backup
device. However, as with any other protective device, system
conditions may produce unexpected and unwanted sectionaliz-
er operation. Overcurrents interrupted by a downline device is
one cause for these occurrences, inrush current is another.
Count restraint and inrush current restraint features are built
into the sectionalizer control to block the sectionalizer’s
response to these system conditions.
A minimum of one-half amp of load current flowing through
any phase of the sectionalizer will block the generation of a
count pulse. This “count-restraint” feature prevents the section-
alizer from counting overcurrents interrupted by downline
devices.
The sectionalizers are also equipped with an inrush-current
restraint feature which distinguishes between inrush currents
and fault currents. If it is determined that the overcurrent
through the sectionalizer is inrush current, the phase actuating
current level of the sectionalizer is raised by a multiple (X) for a
time (Y) after circuit energization. At the same time, ground
overcurrent protection is blocked entirely for a time (Z).
RATINGS
Basic Sectionalizer Ratings
Phase-minimum-actuating 16, 24, 40, 56, 80,112,160
current (amps) 224, 256, 296, 320, 448, 640,
Ground-minimum-actuating 3.5, 7, 16, 20, 28, 40, 56, 80,
current (amps) 112,160, 224, 320, BLOCK
Number of counts to open 1, 2, 3
Count reset (seconds) 15, 30, 60, 120,
Phase actuating level multiplier X1, X2, X4, X6, X8, BLOCK
(inrush restraint)
Phase inrush reset (cycles) 5,10,15, 20
Ground inrush reset (seconds) 0.3, 0.7, 1.5, 3.0, 5.0
Operating Data
Nominal voltage (kv) 14.4
Rated maximum voltage (kv) 15.5
Impulse withstand 1.2 x 50 microsecond wave
(BIL) (kv) 110
60 hertz withstand
Dry, 1 minute (kv) 50
Wet, 10 seconds (kv) 45
Continuous current rating (amps) 400
Rated symmetrical interrupting current (amps rms) 880
Rated making current, asymmetrical (amps rms) 15000
Short-time ratings (amps rms)
10-seconds symmetrical 3500
1-second symmetrical 10000
Momentary maximum, asymmetrical (amps rms) 1500
Creepage distance, standard bushing (in.) 11
Figure 2.
Bi-stable actuator. 87908KMA
DESCRIPTION OF OPERATION
All three sets of moving contacts are linked with bellcranks to a
common torque shaft connected to the electronically controlled
operating mechanism. The mechanism can also be operated
manually. Manual controls consist of the yellow pullring for trip-
ping and the red pullring for closing.
For automatic tripping, a bi-stable actuator trip mechanism is
operated from the electronic sensing-and-counting system.
Bistable actuation is provided by a permanent magnet-and-coil
assembly mounted on a springloaded frame and linkage (Figure
2). When the sectionalizer is closed, the armature below the trip
rod is held against the core by the magnetic force produced by
the permanent magnet. In this state, a compressed spring is try-
ing to pull the trip shaft away from the core. During the tripping
operation, a silicon-controlled rectifier connects charged capaci-
tors across the coil of the magnetic tripping assembly. The
counterflux produced by the discharge of the capacitors is suffi-
cient to allow the spring to override the magnetic force and
operate the tripping circuit.
ELECTRONIC CONTROL CIRCUIT
The printed circuit board in the operator cabinet mounts the
electronic components of the control circuit (Figure 3). A func-
tional block diagram of the electronic circuitry is shown in
Figure4.

S270-20-2
3
Figure 3.
Control printed circuit board.
87905KMA
Figure 4.
Functional bolck diagram for sectionalizers.
Current flowing through the sectionalizer is sensed by the
bushing-current transformers. Three transformers connected in
a wye configuration sense phase currents. Another three bush-
ing-current transformers connected in parallel sense the ground
(earth) or zero-sequence current. These signals are rectified
and are adjusted to the desired minimum-actuating current level
by the selection of the proper plug-in resistors.
To generate and register a count pulse, a current above the
preset-minimum-actuating level must be flowing through the
sectionalizer (downline fault) and this overcurrent must drop to
zero (fault interrupted by the backup protective device). The
pulse counter provides storage for up to three pulses.
Depending upon the counts-to-open setting, the tripping circuit
will turn on after one, two, or three count pulses have been reg-
istered. When turned on, the tripping circuit completes the dis-
charge path for the trip-energy-storage capacitors through the
coil of the bi-stable actuator which, in turn, trips the sectionalizer
mechanism to open the sectionalizer contacts.
The pulse count reset will erase any stored pulse counts
whenever load current through the sectionalizer flows without
interruption for longer than the reset time programmed.
A count-restraint feature is built into the control of Type GV
sectionalizer to prevent the sectionalizer from counting fault cur-
rents interrupted by a downline protective device. The current
restraint will block the generation of acount pulse as long as at
least one-half amp of load current is flowing through the section-
alizer after the disappearance of fault current.
The control is also equipped with an inrush-current restraint
feature which distinguishes between inrush current and fault
current by a logic circuit functionalIy diagrammed in Figure 5. If
an overcurrent is present through the sectionalizer when the
backup protective device opens (current is interrupted), the
overcurrent present upon reclosing is assumed to be fault cur-
rent and the sectionalizer control operates in the normal manner
as previously described. If, however, there is no overcurrent
detected by the sectionalizer when the current is interrupted,
the overcurrent present upon reclosing is assumed to be inrush
current. To prevent the sectionalizer from counting this inrush
current, the fault level detector circuit is modified to raise the

4
Type GV Maintenance Instructions
Figure 5.
Logic diagram for inrush-current restraint feature (both
phase and ground currents).
Figure 7.
Schematic diagram of trip operation.
Figure 6.
Schematic diagram of actuator mechanism with contacts
closed.
phase actuating level by a multiple of 2X, 4X, 6X, or 8X the
normal setting (or current detection can be blocked entirely)
for a time (Y) of 5,10, 15, or 20 cycles after current flow
through the sectionalizer is restored. Upon expiration of this
time, the sectionalizer control returns to normal operating
settings. At the same time, ground overcurrent detection is
blocked entirely for a period (Z) of 0.3, 0.7, 1.5, 3, or 5 sec-
onds after current flow through the sectionalizer is restored.
ACTUATOR MECHANISM OPERATION
All three sets of moving contacts are linked to a common
shaft. To describe the mechanical operation of the GV section-
alizer, a single set of contacts connected to a simplified
straight-line motion linkage is shown diagrammatically:
With the contacts closed, Figure 6, the opening spring is
held extended by the latched toggle mechanism. The trip sig-
nal from the electronic control actuates the bi-stable actuator
assembly which acts upon the trip lever to break the toggle
latch. This action collapses the toggle to open the contacts
and place the mechanism in the condition shown in Figure 7.
Both the closing and the opening springs are relaxed and the
contacts remain open until closed manually. The opening
motion of the main torque shaft also resets the bi-stable actua-
tor assembly. Operating the closing pullring rotates the ratchet-
and-crank assembly

S270-20-2
5
Figure 8.
Schematic diagram of closing operation.
clockwise to extend both springs as shown in Figure 8. The
motion of the crank arm also extends the toggle members
until they latch. A few more degrees of ratchet travel will
overtoggle the crank arm and cause the extended closing
spring to pull the mechanism through the remainder of its
travel to close the contacts. The latched toggle and extend-
ed opening springs are carried along with the contacts into
the original closed position shown in Figure 6. The mecha-
nism is now set for another trip operation.
The contacts can be tripped open manually with another
pullring located underneath the operator mechanism hous-
ing. The manual trip pullring acts on the trip lever to break
the latch and collapse the toggle.
MAINTENANCE
Frequency of Maintenance
Because sectionalizers are applied underwidely varying
operating and climatic conditions, maintenance intervals are
best determined by the user based on actual operating
experience. However, to assure proper operation sectional-
izers must be routinely maintained; sectionalizers should be
externally inspected, the oil level should be checked and the
dielectric strength of the oil should be measured on a yearly
basis. (See steps 1, 2, 8 and 10 of “Periodic Inspection and
Maintenance” below.) Each periodic check should include at
least the following steps:
CAUTION: Never use volatile solutions, deter-
gents, or water-soluble cleaners.
!
WARNING: Continuous use of a sectionaliz-
er, without regular routine inspection and
repair, can affect reliability. This could lead to equip-
ment failure and possible injury.
!
B. Note the counter reading and enter the reading in the record
log.
C. Closeand trip the sectionalizer manually several times to
check the manual operators. Leave the sectionalizer in the
tripped position.
3. Loosen the bolts that secure the head casting and remove
the mechanism from the tank. (If tank and head do not
separate readily, break the gasket seal by prying them
apart.)
A. Allow the oil to drain off mechanism.
4. Inspect contacts for erosion. Refer to Contact Inspection
procedure, within this manual, for inspection instructions.
A. Slight pitting and discoloration can be dressed with crocus
cloth.
B. Replace moving and stationary contacts if they are severely
eroded.
5. Clean all internal components.
A. Remove all carbon traces by wiping with a clean, lint-free
cloth.
B. Flush the internal mechanism with clean, dry transformer oil.
6. Replace head gasket. Use Pliobond to retain new gasket.
7. Inspect tank liners.
A. Soft or spongy areas indicate that water has been
absorbed. Replace liners if this condition exists.
8. Check the dielectric strength of the insulating oil.
A. The dielectric strength should not be less than 22 kv.
B. Low dielectric strength usualIy indicates the presence of
water. There are gasket seals between each bushing and
the head. Check the seals carefully for deterioration or
entrance of moisture.
NOTE: The unit employs a vented oil-level gage and filler plug.
Make sure vent is free and clear to allow unit to breathe with
changes in atmospheric conditions. Normal breathing will prevent
a seal from breaking which can instigate a path for moisture to
enter the tank.
9. Inspect circuit components attached to the recloser head
and operating mechanism.
A. Check condition of wiring to terminal strips, make sure all
connections are tight.
B. Check condition of bushing current transformers and asso-
ciated wiring.
C. Check condition of microswitches and wiring.
10. If oil must be replaced.
A. Drain tank and clean out all sludge and carbon deposits.
B. Fill tank with clean insulating oil to 7/8 in. from top of tank,
with mechanism removed. Capacity is approximately 42
gallons. See oil Condition following.
11. Replace mechanism into tank.
A. Install head bolts and tighten evenly to 12-15 ft-lbs torque.
12. Manually close and trip the unit several times to check for
proper operation of the mechanism.
13. Perform an insulation withstand test (see page 7 for procedure).
Oil Condition
Oil provides the internal insulation barrier between phases and
from phase to ground, and must be replaced before it deterio-
rates below a safe dielectric level. Replace the oil if its dielectric
strength falls below 22 kv.
New oil should always be filtered before use even though it is
obtained from an approved source. Passing the oil through a blot-
ter press will remove free water and solid contaminants such
1. Bypass and remove the sectionalizer from service.
2. Inspect external components.
A. Check for broken or cracked bushings, paint scratch-
es, and other mechanical damage.

6
Type GV Maintenance Instructions
Figure 9.
Test circuit schematic.
as rust, dirt, and lint. Keep aeration to a minimum during fil-
tering to prevent moisture in the air from condensing in the oil
and lowering its dielectric strength.
Used oil must be treated before reusing. Filtering may
remove absorbed and free water and other contaminants to
raise the dielectric strength to acceptable levels. However, fil-
tering does not always remove water-absorbing contami-
nants and the dielectric strength may fall rapidly after being
returned to service. Therefore the sectionalizer should be
filled with new oil, or oil that has been restored to like-new
condition. Oil supplied in sectionalizers conforms to ASTM
Standard D3487, Type l; its property limits are shown in
Reference Data R280-90-1, “Oil Specifications and Tests.”
Insulation Level Withstand Tests
High-potential withstand tests provide information on the
dielectric condition of the sectionalizer. Testing is performed
at 75% of the rated low-frequency withstand voltage 37.5 kv
test voltage.
TEST 1: Proceed as follows:
1. Manually close main contacts.
2. Ground sectionalizer tank and head.
3. Connect all three source-side bushings (1, 3, 5) together.
4. Apply proper test voltage to source-side bushings.
5. The sectionalizer should withstand the test voltage for 60
seconds.
TEST 2: Proceed as follows:
1. Manually close main contacts.
2. Ground sectionalizer tank and head.
3. Ground Phase A (bushing 2) and Phase C (bushing 6).
4. Apply proper test voltage to Phase B (bushing 3).
TEST 3. Proceed as follows:
1. Open main contacts of sectionalizer.
2. Ground sectionalizer tank and head.
3. Connect and ground all three load-side bushings (2, 4, 6).
4. Connect all three source-side bushings (1, 3, 5).
5. Apply proper test voltage to source-side bushings.
6. The sectionalizer should withstand the test voltage for 60
seconds.
7. Reverse the connections: ground source-side bushings (1,
3, 5); apply test voltage to load-side bushings (2, 4, 6) for
60 seconds.
8. The sectionalizer should withstand the test voltage for 60
seconds.
TEST RESULTS: These high potential withstand tests pro-
vide information on the dielectric condition of the sectionaliz-
er and the integrity of the contacts.
A. If the sectionalizer passes the closed-contacts tests
(Tests 1 and 2) but fails the open-contacts test (Test 3)
a deterioration of one or more of the contact assem-
blies is likely to be the cause. Check each contact
assembly individually to determine the failed phase or
phases, and replace. Retest to confirm repair.
B. If the sectionalizer fails the closed-contacts tests (Test
1 and 2) the cause is likely to be a diminished electri-
cal clearance, low oil dielectric strength or failed insu-
lation. After correcting the problem, retest to confirm
repair.
TEST PROCEDURES AND TROUBLESHOOTING
The following test procedures are recommended to check the
operating condition and to determine possible trouble areas in
a malfunctioning unit:
Test Circuit and Equipment
A suggested test circuit is shown in Figure 9. In this test setup
the test current is obtained by back-feeding a 500:5 amp cur-
rent transformer (located in the primary loop of one phase of
the sectionalizer) from an adjustable 120 vac source. The
ammeter scales should be selected to accommodate the
appropriate range of test currents.
IMPORTANT: Before performing any of the test
procedures that follow, make sure the 120 vac
power to the heater and voltage charging board is dis-
connected to disable the voltage restraint feature. The
sectionalizer will not count as long as the voltage
restraint feature (part of the voltage charging board) is
energized.
!
Test Procedures
MINIMUM ACTUATING CURRENT
The minimum actuating current can be verified by testing at the
±ten percent values of the phase and ground actuating current
ratings. For example, the minimum actuating resistor rated at 80
amps is tested at 72 amps (no-count) and 88 amps (count regis-
tered).
PHASE MINIMUM ACTUATING CURRENT
When checking the phase minimum actuating current, the
ground fault sensing portion of the sectionalizer must be dis-
abled. Testing an individual phase without disabling the ground
sensing circuits will cause a false count. The following procedure
can be used:
1. Jumper the ground actuating current resistor with a short lead
to disable the ground sensing circuit.

S270-20-2
7
2. Program sectionalizer for one count-to-open by setting the
COUNTS TO OPEN SELECTOR switch to “1”.
3. Close sectionalizer by operating the close pullring the
required number of times.
4. With the test circuit connected to phase A of the sectionalizer
and S1 open, hold S2 closed and slowly raise the test cur-
rent from zero to the appropriate value shown in Column A
of Table 1.
5. Release S2 to simulate a backup opening. The sectionalizer
should not open.
6. Close S2 and adjust the test current to the appropriate value
shown in Column B of Table 1.
7. Release S2 to simulate a backup opening. The sectionalizer
should count the overcurrent interruption and open.
8. Repeat steps 3 through 7 for phases B and C.
9. Remove the jumper from across the ground actuating current
resistor upon completion of this portion of the test.
GROUND MINIMUM ACTUATING CURRENT
To prevent the possibility of a false count, the phase sensing
portion of the sectionalizer control circuit should be disabled
when the ground minimum actuating current is being checked.
The following procedure can be used:
1. Jumper the phase actuating current resistor with a short lead
to disable the phase sensing circuit.
2. Check that sectionalizer control is set for one count-to-open.
3. Close sectionalizer by operating close pullring the require
number of times.
4. With the test circuit connected to phase A of the sectionalizer
and S1 open, hold S2 closed and slowly raise the test cur-
rent from zero to the appropriate value shown in Column A
of Table 1.
5. Release S2 to simulate a backup opening The sectionalizer
should not open.
6. Close S2 and adjust the test current to the appropriate value
shown in Column B of Table 1.
7. Release S2 to simulate a backup opening. The sectionalizer
should count the overcurrent interruption and open.
8. Repeat steps 3 through 7 for B and C phases.
9. Remove the jumper from across the phase actuating current
resistor.
COUNT RESTRAINT
The count restraint feature prevents erroneous counts of over-
currents interrupted by downline protective devices by blocking
the counting operation as long as a minimum of one-half amp
of uninterrupted line current flows through the sectionalizer.
The operation of the count restraint can be verified by super
imposing an interruptable overcurrent on a constant minimum
line current. The sectionalizer will not count or open on the
interruption of the overcurrent as long as the minimum line cur-
rent is not interrupted. To check the ground restraint feature,
proceed as follows:
1. Jumper the ground actuating current resistor with a short
lead to disable the ground sensing circuit.
2. Check that sectionalizer is set for one count-to-open.
3. Close sectionalizer by operating close pullring the required
number of times.
4. With the test circuit connected to phase A of the sectionalizer
and S1 closed (to simulate a constant load current of
approximately six amps), hold S2 closed and raise the test
current to slightly above the appropriate value shown in
Column B of Table 1.
5. Release S2 to simulate a downline device clearing the over-
current. The sectionalizer should not open verifying the oper-
ation of the count restraint feature.
6. Open S1 and again close and release S2 to simulate a back-
up device clearing the fault. This time the sectionalizer
should count the overcurrent interruption and open.
Table 1
Test Circuit Operating Limits for Actuating Current Settings
Column A Column B
Actuating Sectionalizer Must Sectionalizer Must
Current Setting Not Count Below Count At
(amps) (amps) (amps)
3.5 3 4
7 6.3 7.7
16 14.4 17.6
20 18 22
24 21.6 26.4
28 25.2 30.8
40 36 44
56 50.4 61.6
80 72 88
112 101 124
160 144 176
224 201 247
256 230 282
296 266 326
320 288 352
384 345 422
448 403 493
640 576 704
VOLTAGE RESTRAINT
When energized at 120 vac, the voltage charging board provides fast
charging times for the trip energy storage capacitors. It also acts as a volt-
age restraint; the sectionalizer will not count an overcurrent interruption of
the backup protective device unless the voltage at the control is also inter-
rupted. To check the voltage restraint feature, proceed as follows:
1. Jumper the ground actuating resistor with a short lead to dis-
able the ground sensing circuit.
2. Program sectionalizer for one count-to-open.
3. Close sectionalizer by operating close pullring the required
number of times.
4. Connect 120 vac across pins B and D of the 120 vac input
receptacle.
5. With the test circuit connected to phase A of the sectionalizer
and S1 open, close S2 and raise the current to slightly
above the appropriate value shown in Column B of Table 1.
6. Release S2 to simulate a downline device clearing the over-
current. The sectionalizer
should not open.
7. Disconnect the 120 vac from the input receptacle.
8. Again close and release S2. The sectionalizer should open.
NUMBER OF COUNTS-TO-OPEN
The number of counts-to-open can be verified by interrupting an
overcurrent through the sectionalizer for a preset number of times.
For example, with the control set for three counts, the sectionalizer
will open upon the third overcurrent interruption. Proceed as follows:
1. Jumper the ground actuating current resistor with a short
lead.
2. Program sectionalizer for three counts-to-open by setting
the COUNTS-TO-OPEN SELECTOR switch to “3”.
3. Close sectionalizer by operating the close pullring the
required number of times.
4. With the test circuit connected to phase A of the sectionaliz-
er and S1 open, close S2 and raise the test current to
slightly above the appropriate value shown in Column B of
Table 1.
5. Open and close S2 a number of times. The sectionalizer
should open upon the third opening of S2.
6. To verify the two-counts-to-open setting, set the COUNTS-
TO-OPEN SELECTOR switch to “2” and repeat steps 3
through 5. The sectionalizer should open upon the second
opening of S2.
COUNT RESET
The count reset feature resets the sectionalizer count to zero
whenever current below the actuating level flows through the
sectionalizer for longer than the programmed reset time without

8
Type GV Maintenance Instructions
interruption. The reset time settings have a tolerance of ±
10 percent. It can be verified by interrupting an overcurrent
flow through the sectionalizer one time less than the counts-
to-open setting, then allowing load current to flow for peri-
ods just under and just over the reset setting. The sectional-
izer should open if the overcurrent for the final count is
interrupted within the reset time period (reset has not acti-
vated). The sectionalizer should not open if the over current
for the final count is interrupted after the reset time period
(count has reset to zero). The following procedure may be
used to verify the count reset.
1. Jumper the ground actuating current resistor with a
short lead to disable ground sensing circuit.
2. Program sectionalizer control for 2 COUNTS-TO-OPEN
and set the COUNT RESETSELECTOR to 15 seconds.
3. Close sectionalizer by operating close pullring the
required number of times.
4. With test circuit connected to phase A of the sectionaliz-
er and S1 open, close S2 and raise the test current to
slightly above the appropriate value shown in Column
B of Table 1.
5. Release S2 to simulate a backup protective device
clearing the overcurrent. The sectionalizer will register
a count.
6. Close S1 for 13.5 seconds.
7. Momentarily close and then release switch S2. The sec-
tionalizer should open, verifying that the count reset
has not been activated.
8. Reclose sectionalizer and then close and release S2
once to register one overcurrent interruption count.
9. Close S1 for slightly more than 22 seconds.
10. Momentarily close and release switch S2. The section-
alizer should not open verifying that the count reset has
been activated and the first count has been erased.
11. Again close and release S2. The sectionalizer should open.
INRUSH-CURRENT RESTRAINT
The inrush-current restraint feature distinguishes between fault
currents and inrush currents. For fault current interruptions, the
sectionalizer counts and opens normally. For an inrush-current
condition, the phase minimum actuating current is raised by a
preset multiple for a preset time and ground fault detection is
blocked for a preset time to prevent counting the inrush current.
The operation of the inrush-current restraint can be verified by
simulating a fault condition (the overcurrent is preceded by an
overcurrent interruption) and an inrush condition (the overcur-
rent is preceded by a load current interruption). The following
procedure may be used to verify the inrush current restraint
feature.
1. Jumper the ground actuating current resistor with a short
lead to disable the ground sensing circuit.
2. Set the COUNTS-TO-OPEN SELECTOR switch to “1”
and the PHASE ACTUATING LEVEL MULTIPLIER
switch to X2.
3. Set the GND INRUSH RESET and the PHASE INRUSH
RESET switches to TEST.
NOTE: In the TEST position, the inrush restraint is blocked from
resetting once it is activated.
4. Close sectionalizer by operating close pullring the
required number of times.
5. With test circuit connected to phase A of the sectionalizer
and S1 open, hold S2 closed and raise the test current to
slightly below the appropriate value shown in Column A
of Table 1.
6. Release S2 to simulate a backup opening with only load
current flowing through the sectionalizer when current
was interrupted. The sectionalizer should not open.
7. Close S2 and adjust the test current to just below twice
the appropriate value shown in Column A of Table 1 to
simulate an inrush condition.
8. Release S2. The sectionalizer should not open, verifying
that the inrush restraint feature has been activated.
9. Reset inrush restraint as follows:
A. Return the GND INRUSH RESET and the PHASE INRUSH
RESET switches to some finite values.
B. Hold S2 closed longer than the greater of the two settings
to reset the inrush restraint feature.
C. Return both GND INRUSH RESET and PHASE INRUSH
RESET switches to TEST.
10. Again hold S2 closed and raise the test current to slightly
below the appropriate value shown in Column A of Table 1.
11. Release S2 to simulate a backup opening with only load cur-
rent flowing through the sectionalizer when current was inter-
rupted.
12. Close S2 and adjust the test current to slightly twice the value
shown in Column B of Table 1.
13. Release S2. The sectionalizer should trip verifying the 2X
phase actuating level multiplier setting.
14. Manually close the sectionalizer and repeat step 9 to reset the
inrush restraint feature.
15. Close S2 and raise the test current to slightly above the
appropriate value shown in Column B of Table 1.
16. Release S2 to simulate a backup opening with fault current
flowing through the sectionalizer when current was interrupt-
ed. The sectionalizer should open.
17. Close the sectionalizer.
18. Repeat step 15 to simulate a fault condition.
19. ReleaseS2.The sectionalizer should open verifying that the
inrush restraint feature has not been activated.
Post-Test Procedures
After testing has been completed, make sure the control settings
are programmed to the operating parameters as originally
specified.
TROUBLESHOOTING
Sectionalizer troubleshooting is the process of evaluating prob-
lems that are encountered and determining the cause. The fol-
lowing procedure is recommended.
1. Check for loose or broken connections and wiring. Figure 10
shows the interconnection between the various electrical com-
ponents of the sectionalizer.
2. Check the toggle and associated linkage and springs for
mechanical binding by closing the sectionalizer and tripping it
manually several times.
3. Perform the applicable electrical test described in the Test
Procedures section of these instructions. If the sectionalizer
does not trip under test either the control or the bi-stable actua-
tor assembly may be malfunctioning.
A. Check the bi-stable actuator assembly to see if it has—or has
not—released.
NOTE: There should be approximately 1/32-in. play between the end
of the trip rod and the lever assembly on the main shaft (Figure 13).
(1 ) If the bi-stable actuator assembly actuated the toggle
assembly should be released. If the malfunction is the
result of mechanical binding of the toggle orthe associated
linkages check the engagement surface of the toggle to
make sure there are no rough spots or burrs. Repair as
required.
(2) If the bi-stable actuator assembly did not actuate, check
the d-c resistance of the trip coil:
With the red and the brown leads removed from the con-
trol circuit board the resistance should measure approxi-
mately 6.5 ohms.
If the bi-stable actuator assembly is damaged or
inoperative it must be replaced. Make sure there is
approximately 1/32-in. play between the end of the

S270-20-2
9
Figure 10.
Type GV sectionalizer interconnection diagram.

10
Type GV Maintenance Instructions
Figure 12.
Bushing parts.
Figure 11.
Manual and electrical trip linkage.
trip rod and the lever assembly on the main shaft
(Figure 11) when the new bi-stable actuator is
installed.
(3) If the bi-stable actuator assembly appears to be opera-
tive, check the Zener diode, mounted above the volt-
age charging circuit board. If the Zener diode is dam-
aged replace it.
NOTE: The dc voltage across the zener diode will be approxi-
mately 18 Vdc, with any load current over 10 amps flowing
through the sectionalizer.
B. If all components check out satisfactorily, the problem is in
the control printed circuit board assembly, replace the
board and retest.
SHOP MAINTENANCE PROCEDURES
Bushings
Bushing maintenance is generally limited to a thorough clean-
ing during the regular maintenance inspection; however, if a
bushing is cracked or broken, it must be replaced. To replace
a bushing:
1. Loosen head-clamp bolts and untank sectionalizer.
2. Remove nut, lockwasher, and flatwasher holding the lower
end of bushing rod to the contact housing bracket.
NOTE: If more than one bushing is damaged, replace only one
bushing at a time so thatthe relative position of the contact hous-
ing will not be disturbed. If the contact housing position is
changed, the contacts must be readjusted as described in the
Contacts section of these instructions.
3. Remove the three hex head capscrews and clamps that
secure the bushing to the head and lift out complete bush-
ing assembly.
4. Remove and discard the lower gasket.
5. Depending upon the extend of damage, the complete
bushing assembly can be replaced or new ceramic only
can be installed. If new ceramic only is to be installed,
refer to Figure 12 and proceed as follows:
A. Unscrew the bushing terminal and withdraw the rod
from the bottom of the bushing ceramic; discard the
terminal gasket.
B. Insert the rod assembly all the way into the new ceram-
ic, making sure the roll pin is seated in the locking
groove in the top of the bushing.
C. Assemble the terminal to the bushing rod using a new
terminal gasket; tighten to 35 ft-lbs. of torque.
NOTE: Apply a very small amount of petroleum jelly to the
knurled surface of the inside face of the terminal before
assembly to the bushing rod.
6. Twist off the split aluminum clamping ring from the old
bushing and install on the new bushing if it is in good con-
dition; replace the ring if damaged.
NOTE: The clamping ring cushions and distributes the pressure
between the ceramic and the clamps. DO NOT OMIT.
7. Install the bushing assembly (new or reworked) into the
head using a new lower bushing gasket. Position the
bushing with the stud end of the terminal pointing out-
ward.
8. Position the clamping ring with the split centered between
two clamping bolts.
9. Reassemble the bushing to the head casting. Tighten the
bolts evenly, a little at a time, to 6-10 ft-lbs torque.
NOTE: Clamping forces must be applied gradually and equally in
rotation to each bolt. This results in an evenly distributed gasket
sealing pressure.
10. Reconnect the bushing rod to the contact housing bracket.
Contacts
MOVING AND STATIONARY CoNTACTS
Type GV sectionalizers have an open-type contact arrange-
ment with separate load and arcing contacts (Figure 13). To
check the contacts:
1. Manually trip the sectionalizer and remove the mechanism
from the tank.
2. Inspect the moving and the stationary contacts.
A. If the contacts are rough or carbonized, clean them with
crocus cloth.

S270-20-2
11
Figure 13.
Contact arrangement.
Figure 14.
Contact rod linkage. 87906KMA
57907KMA
B. If the contacts are badly burned or do not close complete-
ly, replace them.
To replace the moving and stationary contacts, refer to Figure
13 and proceed as follows:
1. Remove the two screws securing the moving contact assem-
bly to the contact rod.
2. Remove the hardware securing the stationary contacts to the
anchor block and remove the stationary contacts.
3. Install the new moving and stationary contacts.
A. Align the arms of the stationary contacts parallel to the
anchor block sides before tightening the arms.
4. Refer to the Contact Alignment section of these instructions
for the proper adjustment of contacts.
CONTACT HOUSING
To replace the contact housing:
1. With the switch mechanism removed from the tank, remove
the C-ring and pin securing the contact rod link to the shaft
lever (Figure 14).
2. Remove the lower bushing nuts securing the contact hous-
ing to the bushing assemblies (Figure 13).
3. Lift the contact housing off the bushing assemblies.
4. Operate the actuator mechanism until it is in the switch-
closed position.
5. Place the new contact housing on the upper bushing wash-
ers.
6. Secure the Iink to the shaft assembly with the pin, but do not
replace the C-ring.
7. Adjust the upper bushing nuts until the contact rod provides
a 1/32- to 1/16-in. clearance between the moving contact
assembly and the contact housing, making sure the contact
housing is level.
8. Square the contact housing with the head casting bottom as
shown in Figure 15.
9. Recheck the contact anchor for proper clearance.
10. Tighten the lower bushing nuts to secure the contact hous-
ing.
11. Attach the C-ring to the link pin.
12. Refer to Contact Alignment section of these instructions for
the proper adjustment of contacts.
CONTACT ROD
To replace the contact rod:
1. With the switch mechanism removed from the tank, remove
the C-ring and pin securing the contact rod link to the shaft
lever.
2. Remove the lower bushing nuts securing the contact hous-
ing to the bushing assemblies.
3. Lift the contact housing off the bushing assemblies (Figure
14).
4. Drive out the roll pin at the bottom end to detach the rod
spacer.
5. Pull the contact rod out through the dashpot.
6. Insert the new contact rod through the dashpot.
7. Attach the rod spacer and roll pin at the bottom end.
8. Operate the actuator mechanism until it is in the switch
closed position.
9. Place the contact housing on the upper bushing washers.
10. Secure the link to the shaft assembly with the pin, but do not
replace the C-ring.
11. Adjust the upper bushing nuts until the contact rod provides
a 1/32- to 1/16-in. clearance between the moving contact
assembly and the contact housing, making sure the contact
housing is level.
12. Square the contact housing with the head casting bottom as
shown in Figure 15.
13. Recheck the contact anchor for proper clearance.

12
Type GV Maintenance Instructions
Figure 15.
Square contact housing.
Figure 16.
Contact rod stroke measurement.
87911KMA
87913KMA
14. Tighten the lower bushing nuts to secure the contact
housing.
15. Attach the C-ring to the link pin.
16. Refer to Contact Alignment section of these instructions for
the proper adjustment of contacts.
CONTACT ALIGNMENT
1. Check contact stroke.
NOTE: The contact rod of each assembly has a 3-in. stroke which
must be maintained and checked when replacing contacts.
A. With the switch mechanism removed from the tank and
with the contacts in the closed position, measure from
the top of the contact rod piston down to the support
housing as shown in Figure 16.
B. If this measurement is not 3 in., adjust the lower bushing
nuts holding the contact structure, making sure the con-
tact structure is centered and vertical.
2. Make sure the clearance between the movable contact rod
and the lower surface of the rod bearing block is 1/32- to
1/16-in. with the contacts full closed.
A. To obtain the 1/32- to 1/16-in. clearance, adjust the con-
tact housing structure at the lower bushing nuts. Figure 17.
Setting stop bolt.
3. With the contacts fully closed, check to make sure that the
contact rod piston does not bottom in the contact housing
dashpot.
A. To prevent this bottoming, set the stop bolt inside the oper-
ating housing (Figure 17) so that the slotted side plates of
the latch assembly at the upper pivot bear snugly against
the pivot pin when the latch is in the toggle position as
shown in Figure 18.
(1) Check this by manually winding the actuator mech-
anism.
a. The pivot pin should touch the end of the slot just as
the latch assembly reaches the toggle position.
4. Check contact force.
NOTE: Contact force must be checked when a contact is replaced.

Figure 20.
CT protection board.
Figure 18.
Proper stop bolt. adjustment.
Figure 19.
Measuring fixed contact holding force.
S270-20-2
13
87910KMA
88920KMA
A. Using a pressure gage as shown in Figure 19, check the
contact pressure.
(1 ) The correct amount of force to separate a stationary
contact from its moving contact is 7.5 lb. ± 0.5 lb.
(2) Adjust the pressure toward the high side.
NOTE: The separating force on a set of new contacts is gen-
erally greater than 7.5 Ib.; therefore, the adjustment of new
contacts will be in the direction of reducing contact pressure.
CAUTION: To assure that the acring contacts
make befoe the load contacts, pressure on the
arcing contacts must be equal to — or exceed — the
pressure on the load contacts.
!
B. To adjust the contact pressure, insert a screwdriver
between the stationary and the moving contact tips.
(1) Pry in the direction to move the stationary contact away
from the moving contact tip.
NOTE: A “feel” for applying the proper leverage is easily
determined after the first trial. Make small changes in pres-
sure until experience has been gained.
(2) Equalize—as closely as possible—the pressure on
each side of the set of contacts.
NOTE: To help determine when the applied force causes
contact separation, an electrical continuity check can be
used. The faces of all contacts except the faces of the set
being adjusted are isolated with strips of thin insulating
material.
C. Operate the sectionalizer a few times to make sure all
alignments have been properly secured.
5. Retank the sectionalizer.
Current Transformers
Type GV sectionalizers are equipped with six 1000:1 current
sensing transformers. one is installed over the shank of each
bushing, underneath the head casting. The leads from the cur-
rent transformers are routed to a through connector and then
into the mechanism housing to the CT protection board, see
Figure 20. To test the current transformers proceed as follows:
CONTINUITY CHECK
1. Disconnect white CT lead from phase A connector on CT
protection board. Measure resistance between white lead
and phase A, B, and C leads (connected to CT protection
board). Approximately 11.4 ohms should be measured.
Replace white lead.
2. Disconnect yellow and red CT leads, from ground connec-
tors on CT protection board. Measure resistance between
leads. Approximately 3.8 ohms should be measured.
Replace leads.

Type GV Maintenance Instructions
14
Figure 21.
Test circuit for checking bushing current transformers.
RATIO TEST FOR SENSING CT’s
1. Connect all three phases of the sectionalizer in series, as
shown in Figure 21, and close the sectionalizer.
2. Connect a 100 ampere a-c test circuit to test points 1 and 2,
do not energize.
3. Remove the black CT lead from phase A on the CT protec-
tion board. Insert a 0-500 milliammeter between the black
lead and the white CT lead.
4. Energize the 100 ampere source and observe the millam-
meter. The meter should record 100 ma ±10%. Deenergize
the 100 ampere source and reconnect the lead.
NOTE: Be sure to allow for the tolerances of meter being used.
The resistance of certain type of meters is not negligible. Use as
high a scale (lower resistance) as is accurately readable.
5. Repeat test on phases B and C.
6. Remove red and yellow ground CT leads from CT protection
board. Insert a 0-500 millammeter between red and yellow
leads.
7. Energize 100 ampere source and observe millammeter. The
meter should record 300 ma ±10%. Deenergize 100
ampere source and reconnect leads.
Figure 20.
CT protection board.
POLARITY TEST FOR SENSING CT’s
1. With phases still connected in series, from previous test,
remove three black leads from phase connectors on CT pro-
tection board. Temporarily connect black leads together. Insert
a 0-500 millammeter between black leads and white phase
CT lead.
2. Energize 100 ampere source and observe millammeter. The
meter should record 300 ma ±10%. Deenergize 100 ampere
source and reconnect leads.
A. All three transformers should have the same polarity; the
output should measure 300 ma.
B. If one transformer has its polarity opposite of the remaining
two the output will measure 100 ma.
CT Protection Board
The CT protection board provides automatic protection for the
bushing mounted CTs. The protection board is located on the
right side of the mechanism frame, within the mechanism hous-
ing. The following test can be used to determine if the protection
board is working properly.
Assemble and connect the equipment as shown in Figure 22,
which shows the test voltage being applied to phase A.
1. Slowly increase the voltage on the variable transforme rwhile
observing the voltage between the 1000:1 CT leads.
2. At approximately 115 volts, the voltage should drop off even
though the voltage from the variable transformer is increased.
If the voltage does not drop off, the CT protection board is
damaged and must be replaced. 3. Disconnect input power
and reconnect to test phase B, phase C and ground.
SERVICE PARTS LIST
When ordering service parts, always include the sectionalizer
type and serial number. Because of Cooper Power Systems
continuous-improvement policy, there will be cases in which
parts ordered may not be the same as the parts furnished; how-
ever, they will be interchangeable. All parts have the same war-
ranty as any whole item of switchgear; i.e., against defects in
material or workmanship within one year from the date of ship-
ment.

S270-20-2
15
Figure 23.
Bushing parts and contact assembly.
Bushings and Contacts (Figure 23)
Qty
Item Catalog per
No. Description Number Assy.
1 Contact rod assembly KA149GV 3
2 Contact support assembly KA211VR 3
3 Bracket KP673GV 6
4 Stationary contact assembly KA209VR 6
5 Split lockwasher, 5/16, med, stl K900801031000A 12
6 Capscrew, hex hd, 5/16-18 x
2-1/4, stl K732401131225A 12
7 Machine screw, rd hd, #10-32
x 1, stl K7215001110100A 6
8 Movable contact assembly KA201VR 3
9 Elastic stop nut, #10-32 KP2020A1 6
10 Jam nut, hex, 5/8-18, light, brass K880625118063A 12
11 Split lockwasher, 5/8, med
bronze K900830063000A 12
12 Washer KP2028A45 24
13 Gasket KP2090A29 6
14 Clamping ring KP121L 6
Qty
Item Catalog per
No. Description Number Assy.
15 Bushing clamp KP41L 18
16 Capscrew, hex hd, 3/8-16 x
1-3/4, stl K732401138175Q 18
17 Bushing assembly
13-inch standard creepage KA160E9 6
17-inch extra-creepage KA160E11 6
18 Retaining ring, type X50-227 K970901625000M 12
19 Washer KP2090A2 6
20 Bushing rod KP504GV 6
21 Washer KP2028A40 6
22 Roll pin, 1/8 x 15/16 K970801125093C 6
23 Terminal assembly KP143LA 6
24 Upper bushing gasket KP2090A57 6
25 Bushing ceramic
13-inch standard creepage KP670GV2 6
17-inch extra-creepage KP654GV2 6

Type GV Maintenance Instructions
16
Figure 24.
Head and tank assemblies.

Head and Tank Assemblies (Figure 24)
S270-20-2
17
Qty
Item Catalog per
No. Description Number Assy.
1 Oil seal KP259VR 1
2 Head assembly KP1VR3 1
3 Plug and gage assembly KA213VR 1
4 O-ring KP2000A6 1
5 Capscrew, hex head, 1/2-13 x
1, stl K732401150100Q 2
6 Split lockwasher, med, 1/2, stl K900801050000Z 2
7 Lifting lug KP456H1 2
8 Capscrew, hex head, 3/8-16 x
3, stl K732401138300Q 10
9 Washer KP2028A33 10
10 Gasket KP2103A6 1
11 Spacer KP671GV 12
12 Support KP145RE 12
13 Spacer KP3009A88 12
14 Current transformer assembly KA43GV 6
15 Washer KP2028A46 AR
16 Split lockwasher, med, 1/4, stl K900801025000Z 12
17 Capscrew, hex head, 1/4-20 x
2-1/4, stl K732401125225Y 12
18 Retaining ring KP2013A1 1
19 Washer KP2028A46 AR
20 Bearing KP88VR 3
21 Split lockwasher med, 5/16, stl K900801031000Z 6
22 Capscrew, hex head, 5/16-18 x
2, stl K732401131200Y 6
Qty
Item Catalog per
No. Description Number Assy.
23 Tank liner assembly KP1193H2 3
24 Nut and pin combination KP3061A3 10
25 Tank assembly KA3VCR 1
26 Pipe nipple KP2039A1 1
27 Valve KP2038A1 1
28 Pipe plug KP2007A3 1
29 Capscrew, hex head, 1/2-13 x
1, stl K732401150100Q 1
30 Ground terminal
Parallel ground clamp assembly KA227H
Ground connector assembly KA226H
31 Position indicator assembly KA19VR 1
32 Rollpin,3/16x1-1/4 K970801188125Z 2
33 Bearing KP70VR 1
34 Levers and shaft assembly,
includes items 31 and 32 KA14GV 1
35 Retaining ring, WA514, 1/4, stl K970901250000A 12
36 Link KP17VR 3
37 Pin KP3124A18 6
38 Machine screw, rd head, 1/4-20
x 3/8, stl K721501125038Z 1
39 Cable clip KP2006A12 1
40 Wire retainer K994904170003A 1
41 Connector assembly KA16GW 1
42 O-ring KP2000A6 1

Type GV Maintenance Instructions
18
Figure 25a.
Operating mechanism.

at
Item Catalog per
No. Description Number Assy.
27 Ratchet mechanism assembly KA19GV 1
28 Retaining ring, #WA518, 3/8, stl K9709011375000M 3
29 Pin KP3126A2 1
30 Memory dumping switch
assembly KA196GV 1
Micro-switch only KP172E1 1
31 Cable clip KP2006A8 1
32 Split lockwasher, #8, med, stl K900801008000Z 2
33 Machine screw, rd head, #8-32
x 3/8, stl K721501108038Z 2
34 Split lockwasher, 5/16, med, stl K900801025000Z 2
35 Capscrew, hex head, 5/16-18 x
3/4 stl K732401131075Q 2
36 Cable clip KP2006A4 1
37 Spacer KP3007A71 2
38Voltage charging board assembly KA174GV1 1
39 Machine screw, rd head, #10-32
x 5/8, stl K721501310068Z 2
40 Terminal strip marker KP2101A201 1
41 Terminal strip KP2101A1 1
42 Zener diode KP4012A39 1
43 Lockwasher, external tooth, 1/4 K901132025000A 1
44 Gasket KP2084A1 1
45 Cover KP129VR 1
46 Self tapping screw, #2 x 3/16,
st stl K741515106019Z 4
47 Nameplate KP730R 1
48 Spring KP537GV 1
49 Sleeve KP280VR 1
50 Closing spring KP533GW 1
51 Manual trip rod assembly KA65VR 1
52 Spacer KP3007A1 8 1
53 Washer, flat, 1/4, stl K900201025000Z 1
54 Speed nut KP2005A1 1
55 Washer, plain, #10, brass K900525010000A 1
56 Spacer KP2028A46 2
57 Spring KP157VR 1
Operating Mechanism (Figure 25a)
S270-20-2
19
Qty
Item Catalog per
No. Description Number Assy.
1 Control printed circuit board
assembly KA175GV 1
2 Split lockwasher, #6, med, stl K900801008000Z 10
3 Machine screw, rd head, #6-32
x3/8,stl K7215011008038Z 6
4 Phase trip resistor assembly KA176GV_* 1
*Complete part number with
value: 16, 24, 40, 56, 80, 112,
160, 224, 256, 296, 320, 448,
or 640.
5 Ground trip resistor assembly KA177GV_* 1
*Complete part number with
value:3.5,7,16,20, 28, 40,
56, 80, 112, 160, 224, 320, or
BLO (block).
6 Machine screw, rd head, #6-32
x 1/2, sH K7215011006050Z 5
7 Cable clip KP2006A1 1
8 Retaining ring, #WA510, 3/16 K970915188000A 7
9 Link arm KP645GV 2
10 Trip arm assembly KA122GV 1
11 Pin KP3123A31 3
12 Manual trip linkage assembly KA126GV 1
13 Bracket KP688GV 1
14 Machine screw, rd head, #10-32
x 3/4, st stl K721515310075A 2
15 Split lockwasher, #10, med, stl K900801010000Z 4
16 Hex nut, #6-32, stl K880101132006Z 1
17 Mounting plate assembly KA178GV I
18 Retaining ring, #WA516, 5/16, stl K970901312000M 3
19 Pin KP3125A7 1
20 Link KP31VR 2
21 Spacer KP3010A7 1
22 Opening spring KP35VR 2
23 Washer, #20, brass K900225020000A 1
24 Spacer KP3011A6 1
25 Toggle assembly KA11 VR1 1
26 Washer, 1/2, brass K900225050000A 1

Type GV Maintenance Instructions
20
Figure 25b.
Operating mechanism.