ABB 41-661.2A Manual

Instruction Leaflet
I.L.
ABB Power T&D Company Inc.
Relay Division
Coral Springs, FL 33065
RCL
Effective: February 1966
Supersedes
I.L
41-661.2
Dated May 1984
Automatic ReclosingRelay
Q
Denotes Change From Superseded issue
in
FT-21 Case
CAUTION
Before putting relays into service, remove all
blocking which may have been inserted for the
purpose of securing the parts during shipment,
make sure that all moving parts operate freely,
inspect the contacts to see that they are clean and
close properly, and operate the relay to check
the settings and electrical connections.
APPLICATION
The type RCL automatic reclosing relay is used
for automatic reclosure of a-c or d-c electrically
operated circuit breakers after they have been
opened by overcurrent or other protective relay
action. The relay may be adjusted to provide
several reclosures at predetermined time inter-
vals, so that in case the breaker does not remain
closed after the first reclosure additional reclo-
sures will be made. The first reclosure usually
is an instantaneous reclosure through preclosed
contacts since system operating experience has
shown that the majority of faults are of a tem-
porary nature, such as lightning flashovers, and
will not be re-established after interruption of the
fault current. Consequently, service interruption
can be minimized by the use of an instantaneous
reclosure. However, the first reclosure may be
delayed if desired.
In case the circuit breaker does not remain
closed after the first reclosure, the relay will make
additional reclosures at suitably graded intervals.
It is common practice to make two additional
reclosures, but the relay may be adjusted to make
any number up to a total of six reclosures if de-
sired. If the breaker does not remain closed after
the final reclosure, the timing drum stops in the
“Lockout” position, and any further attempts at
reclosure must be made by manual operation of
the control switch. However, if the breaker re-
mains closed after any automatic reclosure, or,
subsequently, after manual reclosure, the relay
timing drum will advance to and stop at the
“Start” position, where the relay is in readiness
for another cycle of automatic reclosures follow-
ing the next tripping of the breaker.
For any automatic reclosing application, the
de-rating factors for breaker interrupting ability
should be checked when choos&g any particular
reclosing cycle. Also, when using instantaneous
first reclosure it is necessary that the protective
relays open their contacts within 10 cycles or
less after the breaker is tripped in order that the
trip circuit will be de-energized before reclosure
takes place.
CONSTRUCTION
As shown in Fig. 2, the RCL relay consists of a
Olatching solenoid unit, Y, a synchronous motor
driven timing unit, and a telephone relay unit, X.
TIMING UNIT
The timing unit contains a synchronous motor
and gear train mounted behind the front subbase.
The gear train drives a drum with cams, which
actuate contacts 1, 2 3, 4 and 14. Cam #5
actuates the Y unit latch to reset the Y unit and
close the Y 13 contact. Cams # 1 and #2, which
operate contacts 1 and 2 respectively, are notched
and are not intended to be adjusted in the field.
Cam #3 is a series of flat springs secured by
screws, which can be located at any point on the
All possible contingencies which may arise during installation, operation or maintenance, and all details
and variations of this equipment do not purport to be covered by these instructions. If further information
is desired by purchaser regarding #is particular installation, operation or maintenance of this equipment,
the
local ABB Power T&D Company Inc. representative should be contacted.
Printed in
USA
Aim
MPIP
41
-
661.2
A
Courtesy of NationalSwitchgear.com

I
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.
41
-
661.2
A
periphery
of
the
drum
.
Cams
#
4
and
#
5
consist
of
show
contact
positions
as
a
function
of
the
drum
screws
which
can
be
set
at
any
point
on
the
©
position
.
Fig
.
4
is
based
on
the
factory
cam
periphery
of
the
drum
.
Cam
#
14
is
a
single
adjustment
—
immediate
,
15
and
45
second
reclo
-
micarta
block
,
located
to
the
rear
of
the
cam
#
5
sures
,
with
one
drum
revolution
in
60
seconds
,
position
and
held
by
a
#
5
cam
screw
.
O
It
is
further
assumed
in
Fig
.
4
,
that
the instanta
-
neous
trip
is locked
out
after
the first reclosure
,
and
the
fault
is
not
cleared
prior
to
lockout
.
The
gear
train
reduction
ratio is
adjustable
.
The
drum
speed
dial contains
indices
,
which
are
lined
up
with
an
index
mark
to
mesh
the
proper
gears
for
the desired drum
speed
.
A
clamping
screw
is
provided
at
the
edge
of
this dial
.
A
push
rod is
located
on
the
front of
the
drum
to
demesh the
drum
and
permit
free
manual
drum rotation
.
MOTOR
CONTROL
Motor
energization
is
controlled
by
cams
1
and
2
.
In
the
start
position
the
motor
is
energized
through
#
1
and
52
b
contacts
when
the
breaker
opens
.
As
the drum
moves
away
from
the
start
position
,
#
2
contact
closes
to
energize
the
motor
through
the
52
a
contact
during
the
time
that
the
breaker
is
closed
.
If
the
breaker is
closed
at
the
lockout
position
the
drum
will
continue
to
ro
-
tate
until
the
#
2
contact
opens
at
the
start
posi
-
tion
.
If
the breaker
is
open
,
the
drum will
stop
in
the
lockout
position
,
since
the
#
1
,
52
a
and
Y
7
contacts
are
all
open
at
this
point
.
The
dial
on
the
timing
drum has
60
divisions
(
second intervals with
60
second
drum
speed
)
.
The
edges
of
the
#
3
,
4
and
5
cam
slots
have
12
equally
spaced
white marks
corresponding
to
5
second
intervals
with
a
60
second
drum
speed
.
Y
SOLENOID
UNIT
The
Y
unit coil is
located
to
the
rear
of
the
front
sub
-
base
.
When
energized
a
plunger
is
at
-
tracted
toward
the
rear
of
the
relay
against
a
spring
.
A
micarta
disc
on
the
front
end
of
the
plunger
actuates
contacts
Y
5
and
Y
7
.
As
the disc
moves
to
the
rear
it
releases
the
latch
arm
.
When
released
the
latch
arm
is
rotated
counterclockwise
by
the
tension
of
the
moving
contact
spring
of
contact
Y
13
and
a
small
helical
spring
.
This
rota
-
tion
blocks
the
full
reset
when
Y
is
de
-
energized
,
o
Thus
,
the
Y
unit
has
three
positions
as
shown
in
Table
I
.
The
Y
unit
,
is
reset
by
the
#
5
cam on
the
timing
drum
,
which
rotates
the
latch
arm
clock
-
wise
against
the
tension
of
the
Y
13
moving
con
-
tact
spring
.
CLOSING
SEQUENCING
The number
of
reclosures and
the time
at
which
they
occur
is
determined
by
the
location
of
the
#
3
cam
screws
,
which close
the
#
3
contact
.
INSTANTANEOUS
TRIP
LOCKOUT
As
shown
in
Figs
.
5
and
4
,
the
trip
circuit
of
the
instantaneous
trip
units
is
opened
by
Y
13
and
14
contacts
from
the time
of
the
first reclosure
until
the
drum
returns
to
the
start
position
.
Dur
-
ing
the
initial
reclosing
,
contact
Y
13
is
opened
and
remains
open
until the
Y
unit is
completely
reset
at
6
seconds
.
The
purpose
of
contact
Y
13
is
to
keep
the
trip
circuit
open
until
cam
contact
,
14
,
can
be
opened
by
the drum
rotation
.
Contact
Y
13
has
no
significance
during
subsequent
re
-
closing
operations
.
Table
I
Y
Unit
Contact
Positions
Plunger
Position
Contact
Position
Y
13
Y
5
Y
7
Closed
Closed
Open
Reset
Latched
and
De
-
energized
(
Intermediate
)
Energized
X
-
Y
ANTI
-
PUMP
CIRCUIT
Open
®
Referring
to
Fig
.
5
,
when
the
breaker
close
cir
-
Closed
Closed
Open
Open
cuit
is
energized
through
52
bb
,
Y
5
and
#
3
con
-
tacts
,
the
79
X
coil is also
energized
.
Then
,
X
8
and
X
9
contacts
seal around the
Y
5
contact
and
ener
-
OPERATION
gize
79
Y
coil
,
respectively
.
Contact
Y
5
opens
and
remains
open
until
the
Y
unit is
completely
reset
at
6
seconds
.
As
the
breaker
closes
,
52
bb
contact
opens
,
de
-
energizing
the
X
and
Y
coils
.
Should
Operation
of
the
relay
and
associated
equip
-
ment
will
be
described
,
using
the external sche
-
O
matic
in
Fig
.
5
,
in
conjunction
with
Fig
.
4
.
which
2
Courtesy of NationalSwitchgear.com

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41
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66
L
2
A
i
=
:
!
I
:
:
j
Fig
.
1
.
Type
RCL
Reiay
3
Courtesy of NationalSwitchgear.com

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41
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A
Fig
.
2
.
Internal
Schematic
of
the
RCL
Relay
in
Type
FT
21
Case
4
Courtesy of NationalSwitchgear.com

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A
O
Fig
.
3
.
Cam
and
Y
Unit
Contact
Positions
5
Courtesy of NationalSwitchgear.com

I.L. 41-661.2A
the breaker immediately trip again, contacts Y5
and X8 will be open to prevent premature ener-
gization of the breaker close circuit.
COMPLETE OPERATING SEQUENCE
Fault-Trip -Immediate Reclosure
0 Refer to Fig. 5. With the timing drum in the
“Start” position, a #3 cam spring will be holding
contact #3 closed. The breaker switch contacts
52b and 52bb close, energizing the motor 79M
through contact #I, and the drum begins to ro-
tate. At the same time the coil of the contactor
unit, 79X, is energized through drum contact #3,
and contact YS. When the breaker latch checking
switch, 52LC, closes, the breaker control relay
52X is immediately energized through the
pre-
closed contacts YS and 3. This in turn energizes
the closing coil of the breaker,
52C. Simulta-
neously, contactor unit, 79X, seals in through its
contact X8, while its other contact, X9, energizes
the coil of solenoid unit 79Y to open contacts
YS and Y 13 and close contact Y7. As the circuit
breaker closes, the breaker auxiliary switches 52b
and 52bb open, and 52a closes. Opening 52bb
de-energizes 79X and 79Y. The latter then resets
against its latch, thus leaving contacts YS and
Y 13 open and contact Y7 closed until the latch
is released. Before the latch is released, the drum-
operated contact, 14, will be opened and will
remain open until the drum returns to the “Start”
position.
Preparing for Second Reclosure
The drum continues to rotate. When the
breaker trips the second time, no immediate
operation occurs. At about one second, #2 cam
contact closes to set up the motor circuit when
the breaker is subsequently reclosed. At about
the three second drum position contact
#3
opens. At about 6 seconds, the Y unit latch is
released by the #S cam, resetting the Y unit. The
relay is now ready for another reclosure as soon
as contact
#3 is closed by the #3 cam spring. The
drum will continue to rotate, since the motor is
energized through
S2b and #l contacts.
Second and Third Reelosures
At
15 and 45 seconds the #3 contact closes to
reclose the breaker. After each reclose, the Y unit
is unlatched by the action of cam
#S.
6
Lockout
When the drum reaches the lockout position,
the motor is de-energized, since cam contact
#I
opens (assuming the breaker is open). The breaker
must then be closed by the control switch. If
the breaker then remains closed the drum will
rotate to the “Start” position, where the motor is
de-energized by the #2 cam contact.
CHARACTERISTICS
The standard rating for the relay is:
Motor . . 120/240 V, 60 hertz
X and Y Units.
. . . 120/24OV, 60 hertz
or
481125 Vdc
Drum Speeds.,
. . . . . . . . 60-90-180-360
Sec./Rev.
When the motor is to be operated at 240 volts
a resistor in the bottom right side is connected in
series with the motor coil. Relays are available for
operation on SO hertz. X and Y units can be sup-
plied for a minimum rating of 24 volts d-c, or
with a 250 volt rating.
BURDEN DATA
The maximum burdens for the various units
of the standard RCL relay when energized from a
120 V, 60 cycle supply are listed below:
Contactor Unit (Device 79X)
Open position
. . . .
49 VA
Closed position
.
33 VA
Solenoid Unit (Device 79Y)
Open position
. 15 1 VA
Closed position . . . .
84 VA
Synchronous Motor (Device 79M).
. . 8.5 VA
The burdens of the X and Y units occur only
momentarily during the reclosing cycle but the
motor is energized throughout the .reclosing cycle.
The X and Y units can be energized for a 1 min-
ute period and the motor for a 15 minute period
without injury.
SETTINGS
No settings are necessary unless factory settings
do not meet the application requirements. The
factory settings are for three reclosures - imme-
diate,
15 and 45 seconds, with a drum revolu-
Courtesy of NationalSwitchgear.com

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41
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A
tion
in
60
seconds
.
Contact
ft
4
is
set
to
close
in
the
lockout
position
.
Contact
#
14
is
set
to
close
in
the
start
position
for
instantaneous
trip
lock
-
out
after
the
first
reclosure
.
The
standard
relay
is
shipped
with
the
X
and
Y
coil
and
motor
coil
resistors
connected
.
With
these
connections the
X
and
Y
coils
may
be used
at
125
volts d
-
c or
240
volts
a
-
c
;
the
motor
,
at
240
volts
a
-
c
.
unit
after
each
ft
3
contact
closure
.
The
#
5
screws
should
not rotate
the
Y
unit latch
arm
until the
#
3
contact
has
opened
.
In
addition
,
the
#
5
cam
screws
must
be
clear
of
the
Y
unit
latch
arm
be
-
fore
the
next
#
3
contact
closure
.
Hardware
is
shipped
with
each
relay
to
provide
additional
cams
for
applications
requiring
more
cams
than
are
used
with
the
factory
settings
.
COIL
RESISTOR
RECONNECTION
INSTALLATION
If
the
X
and
Y
coils
of
the
standard
relay
are
to
be used
on
48
volts
d
-
c
or
120
volts
a
-
c
,
the
X
and
Y
coil
resistor
must
be
bypassed
.
If
the
motor
is
to
be
energized
at
120
volts
a
-
c
,
the
motor
coil
resistor
must
be
bypassed
.
The
relays
should be
mounted
on
switchboard
panels
or
their
equivalent
in
a
location
free
from
dirt
,
moisture
,
excessive vibration
and
heat
.
Mount
the
relay
vertically
by
means
of
the
rear
mounting
stud
or
studs
for
the
type
FT
projec
-
tion
case
or
by
means
of
the
four
mounting
holes
on
the
flange
for
the
semi
-
flush
type
FT
case
.
Either the stud
or
the
mounting
screws
may
be
utilized
for
grounding
the
relay
.
External
toothed
washers
are
provided
for
use
in
the
locations
shown
on
the
outline
and
drilling
plan
to
facili
-
tate
making
a
good
electrical connection
between
the
relay
case
,
its
mounting
screws
or
studs
,
and
the
relay
panel
.
Ground Wires
are
affixed
to
the
mounting
screws
or
studs
as
required
for
poorly
grounded
or
insulating
panels
.
Other
electrical
connections
may
be
made
directly
to
the
termi
-
nals
by
means
of
screws
for
steel
panel
mounting
or
to
the terminal
stud
furnished
with the
relay
for
thick
panel
mounting
.
The
terminal stud
may
be
easily
removed
or
inserted
by
locking
two
nuts
on
the
stud and then
turning
the
proper
nut
with
a
wrench
.
DRUM
SPEED
To
change
the drum
speed
,
loosen
the
clamp
-
ing
screw
at
the
edge
of
the
drum
speed
dial
,
depress
the
push
rod
on
the drum
,
and
rotate
the
motor
and
gear
assembly
to
the desired
speed
position
,
by
pushing
on
one
or
more
of
the
posts
between the
motor
and
gear
mounting
plates
.
Then
tighten
the
clamping
screw
.
Select
the
fast
-
est
drum
speed
which will accommodate
the
de
-
sired reclose
timing
.
RECLOSE
SEQUENCE
The
#
3
cam
springs
(
which
initiate
reclosing
)
can
be
set
at
any
point
from
the
start
position
,
to
the
50
th
scale division
,
by
loosening
the
cam
spring
screw
and
sliding
the
cam
to
the
desired
position
.
The
cams
may
not
be
spaced
closer
than
10
scale divisions
.
If
a
closer
spacing
is used
there
is
not
sufficient
time
to
open
the
ft
3
contact
and
then unlatch
the
Y
unit
.
Thus
,
the maximum
number
of
reclosures is
six
at
the
0
,
10
,
20
,
30
,
40
and
50
scale
division
points
.
A
cam
spring
may
not
be
placed
past
the
50
th
scale division
.
Other
-
wise
insufficient
time is
available
to
allow the
Y
unit
to
unlatch and
ft
5
cam
screw
to
travel
clear
of
the
latch
before
the
lockout
position
.
A
thin
headed
screw
is located
in
the
ft
3
groove
near
the
start
position
.
This
screw
acts
as
a
stop
to
prevent
a
ft
3
cam
spring
setting
which would
close the
ft
3
contact
with the
drum
in
the
lockout
position
.
After
the
ft
3
cam
springs
have been
set
,
the
ft
5
cam
screws
must
be
located
to
unlatch
the
Y
For
detail
information
on
the
FT
case
refer
to
I
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41
-
076
.
ADJUSTMENTS
AND
MAINTENANCE
The
proper
adjustments
to
insure
correct
op
-
eration
of
this
relay
have
been
made
at
the
fac
-
tory
.
Readjustment
after
receipt
by
the
customer
will be
necessary
only
as
required
by
the
reclosing
cycle
requirements
and the
supply
voltages
of
a
particular application
as
described
under
“
Set
-
tings
.
”
In
reassembling
the
relay
after
repairs
,
or
in
checking
the
adjustments
at
regular
mainte
-
nance
periods
,
the
instructions below should
be
followed
.
7
Courtesy of NationalSwitchgear.com

I.L. 41-661.2A
ROUTINE CHECK
The factory settings of the standard relay are:
Coil Resistors in series with X and Y, and motor:
X and Y rating. .
. . 125 Vdc/24 0 Vat
Motor ratin g . . . . . . . . . 240 V 60 cycles
Motor spee d
. . . . . . 1 revolution in
60 seconds
Contact Settings . . . .See Fig. 4
The following checks may be performed to
determine if the relay, as received from the fac-
tory, is in serviceable condition.
Energize the X, Y and motor coils with 70%
of the above a-c ratings (or 80% of d-c rating) or
at lower ratings by bypassing the coil resistor or
resistors. See that X and Y pick up positively and
that proper contact action is obtained.
Determine the time required for one drum
revolution. The time in seconds should corre-
spond to the drum speed dial markin g?3.5%.
Observe drum cam action during this interval or
by manually rotating the drum with the push rod
depressed.
ROUTINE MAINTENANCE
All contacts should be periodically cleaned with
a fine tile. A contact burnishe r
S#182A836HOl
is recommended for this purpose. The use of
abrasive material for cleaning contacts is not
recommended, because of the danger of embed-
ding small particles in the face of the soft silver
and thus impairing the contact.
MOTOR LUBRICATION
The motor bearing contains a supply of special
lubricant sufficient for from three to five years
service. This lubricant does not congeal at low
temperatures and permits satisfactory operation
of the motor at ambient temperatures o f
30°F
to -40°F, such as sometimes may occur in out-
door installations. This oil is available i n
I oz.
bottles a sS#1723639.
To lubricate the motor, withdraw the drum
speed dial assembly after removing the clamping
screw and the black screws. Then, gently work
the motor and gear assembly loose from the rear
chassis mounting plate and lower it under the
front chassis mounting plate. Remove the gear
plate of the motor and gear assembly and, then,
the knurled oil cap. Saturate the wool with
S#172363 9oil. Reassemble.
RENEWAL PARTS
Repair work can be done most satisfactorily at
the factory. However, interchangeable parts can
be furnishe dto the customers who are equipped
for doing repair work. When ordering parts,
always give the complete nameplate date.
8
Courtesy of NationalSwitchgear.com

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Fig
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4
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Contact
Position
Development
—
One
Immediate
and
Two
Time
Delay
Reclosures
.
Heavy
Line Indicates
Contact
Closed
or
Coil
Energized
.
One
Revolution
in
60
Seconds
.
Permanent
Fault
.
Instantaneous
Trip
Lockout
After
First Reclosure
.
9
Courtesy of NationalSwitchgear.com

LEGEND
2
50 INSTANTANEOUS TRIP UNIT 52 LATCH CHECK SW
8
-CONTROL POWER SWITCH
43 AUTOMATIC OPERATION CUTOUT SW. OIL CIR. BKR. TRIP
52
OPEN TC COIL
WHEN BKR. IS OPEN
CIR. BKR. AUX. SW. CLOSED -CONTROL RELAY
b
WHEN BKR. IS OPEN
52 -CUTOFF RELAY
52 OIL BKR. MECH. SW. CLOSED
Y
IN OPER. POSITION
79 RCL RELAY MOTOR
BKR. MECH. SW. OPEN
M
bb IN OPER. POSITION
79 RCL TELEPHONE RELAY
l-2-34-14 RC RELAY DRUM OPERATED CONTACTS X UNIT 101
-CONTROL SWITCH 79 RCL RELAY SOLENOID
201
-AUXILIARY RELAY FOR Y UNIT
SUPERVISORY TRIP LOCKOUT RELAY
201X -AUXILIARY RELAY PR-PROTECTIVE RELAY
r
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Sub
2
1492
B
05
Sheet
1
&
2
O
Fig
-
5
.
External
Schematic
of
the
Type
RCL
Relay
,
without
Z
Unit
,
with
AC
Breaker
Control
Circuit
10
Courtesy of NationalSwitchgear.com

I
.
L
.
41
-
661.2
A
.
563
.
250
(
14.30
)
OIA
.
4
HOLES
FOR
.
190
*
32
MTG
.
SCREWS
*
5.563
-
»
(
141
,
30
)
(
6.35
)
1.594
(
40
,
49
)
k
-
6
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(
|
54.00
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2.781
(
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)
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L
5.219
(
132.56
)
9.063
3
(
230.188
)
9.688
(
246.08
)
4
"
t
4
4
4
,
4.531
(
115.09
)
4.844
(
123.04
)
10.438
(
265.13
)
>
i
-
2.938
(
74
,
63
)
3.188
(
80.98
)
K
5.875
(
149.23
)
6.375
-
*
(
161.93
)
PANEL
LOCATION
SEMI
-
FLUSH
MTG
.
PROJECTION MTG
DIMENSIONS
IN
INCHES
DIMENSIONS
IN MM
.
\
rLARGE
INTERNAL
\
Ka
EXTERNAL
\
/
VjOOTH
WASHER
—
SMALL
EXTERNAL
TOOTHED
WASHERS
PANEL
CUTOUT
6
DRILLING
FOR
SEMI
-
FLUSH
MTG
1
,
344
(
34.14
)
2.688
(
68.2
8
)
.
563
&
(
14.30
)
DIA
.
2
HOLES
_
5.375
(
136.53
)
4
-
K
0
I
6
(
.
397
)
.
250
_
(
6.35
)
“
0
kl
.
03
l
—
+
-
I
.
03
I
1.031
^
-
1.031
-
H
(
26.19
)
(
26.19
)
(
26.19
)
(
26.19
)
1
I
.
190
-
32
SCREW
.
375
1.344
SPACERS
FOR
(
34.14
)
THIN
PANELS
(
9.53
)
R
PANEL
CASE
rA
,
5
/
16
-
18
SCREW
(
FOR
THICK PANELS
fie
09
)
USE
5
/
16
-
18
STUDS
)
.
INTERNAL
-
EXTERNAL
/
TOOTHED
WASHERS
.
190
-
32
SCREW
FOR
THICK PANELS
USE
.
190
-
32
STUDS
7
1
/
1.0
yl
(
25.4
)
f
\
i
l
3
5
A
/
7
9
i
1.813
i
2.0
l
(
46.05
)
i
(
50.8
)
10
V
2
4
6
8
I
±
V
v
*
—
—
516
(
13.11
)
H
.
03
I
-
H
03
I
1.031
-
A
~
1.031
-
*
(
26.19
) (
26.19
)
(
26.19
)
(
26.19
)
.
750
TERMINAL
NUMBER
DIA
.
(
19.05
)
10
HOLES OR
CUTOUT
PANEL
DRILLING
OR CUTOUT FOR
PROJECTION
MTG
.
(
FRONT
VIEW
)
t l
.
641
TERMINAL
AND
MOUNTING
DETAILS
DIA
;
(
16.28
)
Sub
9
57
D
7901
Fig
.
6
.
Outline
and
Drilling
Plan
for
the
Type
RC
Relay
in
the
FT
21
Case
11
Courtesy of NationalSwitchgear.com

ABB Power T & D Company Inc.
Relay Division
Coral Springs, FL 33065
Addendum to:
RCL
Automatic Reclosing
Effective
:
April 1990 Relay
The resistor and capacitor circuit across the #3 or
#4
Contact is a high impedance circuit. It provides a
suppression function for the dc close application, but should be disconnected for the ac close application
because sensitive auxiliary relays in the breaker close circuit may stay picked-up.
’
All possible contingencies which may arise during installation, operation or maintenance, and a// details
and variations of this equipment do not purport to be covered by these instructions. If further informa-
tion is desired by purchaser regarding this particular installation, operation of maintenance of this equip-
ment, the local ABB representative should be contacted.
Ik
IIII
nmi
41
-
661.2
A
Courtesy of NationalSwitchgear.com