AlIis-Chalmers Ruptair F Series User manual

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INSTRUCTION
BOOK
\
i
*
•
-
4
v
.
tv
*
1
-
TYPE
"
F
"
MOVABLE
PORTION
FC
-
150
/
250
/
500
RUPTAIR
MAGNETIC
POWER
CIRCUIT
BREAKER
AND
AUXILIARY
EQUIPMENT
(
STORED
-
ENERGY
OPERATOR
)
%
*
t
£
September
1
,
1966
Book
No
.
6630
-
2
5
*
o
'
1
/
}
tt
'
$
t
.
-
-
.
a
•
•
}
*
•
}
Courtesy of NationalSwitchgear.com

ALLIS
-
CHALMERS
TABLE
OF
CONTENTS
(
SE
-
3
,
STORED
ENERGY
OPERATOR
)
CONTENTS
SECTION
NO
.
PART
I
DESCRIPTION
GENERAL
METHOD
OF
ARC
INTERRUPTION
1
.
1
1.2
PART
2
ADJUSTMENTS
2.1
GENERAL
PART
3
SE
-
3
STORED
ENERGY
OPERATOR
OPERATOR
CHARGING
THE
SPRINGS
CLOSING
THE
BREAKER
MANUALLY
SLOW
CLOSING
THE
BREAKER
OPENING
THE
BREAKER
3.1
3.2
3.3
3.4
3.5
3.6
ARM
3.7
MAIN
TOGGLE
ROLL
CLOSING
SPRINGS
TRIP
LATCH
CLOSING
LATCH
TRIPPING
AND
CLOSING
SOLENOID
AUXILIARY
EQUIPMENT
AUXILIARY
SWITCH
INTERLOCK
PLUNGER
OPERATOR
CONTROL
RESET
RELAY
3.9
3.10
*
7
3.11
i
3.12
3.13
3.14
v s
3.15
N S
3.16
3.17
v
PART
4
DISCONNECT
SECTION
vs
4.1
BREAKER
MECHANISM
CONTACTS
SERVICING
CONTACTS
BREAKER
TIMING
ARCING
CONTACT
HINGE
JOINT
CONTACT
PRESSURE
ON
HINGE
JOINT
CONTACT
ALIGNMENT
CONTACT
LEAD
CONTACT
STROKE
Vi
4.2
X
4.2
A
\
4.3
4.4
HI
4.5
4.6
Vb
4.7
4.8
PART
5
ARC
CHUTE
ASSEMBLY
5.1
ARC
CHUTE
ASSEMBLY
PHASE
BARRIERS
TILTING
ARC
CHUTES
BARRIER
STACKS
5.2
5.3
5.4
Courtesy of NationalSwitchgear.com

&
L
ALLIS
-
CHALMERS
LIST
OF
ILLUSTRATIONS
TYPE
"
F
"
MOVABLE
PORTION
FC
-
150
/
250
/
500
RUPTAIR
MAGNETIC
POWER
CIRCUIT
BREAKER
AND
AUXILIARY
EQUIPMENT
(
STORED
-
ENERGY
OPERATOR
)
FIGURE
1
TYPICAL
MAGNETIC
BREAKER
71
-
401
-
-
475
-
401
FIGURE
2
71
-
401
-
442
-
401
TYPICAL
ARC
CHUTE
71
-
401
-
444
-
401
FIGURE
3
TYPICAL
STUD
AND
SUPPORT
FIGURE
4
71
-
303
-
129
-
401
TYPICAL
STORED
ENERGY
OPERATOR
71
-
209
-
564
-
401
FIGURE
5
OPERATOR
ADJUSTMENTS
FIGURE
8
72
-
320
-
033
-
4
-
01
TYPICAL
CONTROL
SWITCH
71
-
301
-
758
FIGURE
11
TYPICAL
AUXILIARY
SWITCH
71
-
116
-
481
FIGURE
13
TYPICAL
OPERATOR
LINKAGE
DIAGRAM
14
15
205399
LEFT
FRONT
VIEW
OF
TYPE
"
F
"
AIR
MAGNETIC
CIRCUIT
BREAKER
WITH
TYPE
SE
-
3
STORED
ENERGY
OPERATOR
205397
MANUAL
CLOSING
DEVICE
205391
VIEW
SHOWS
APPLICATION
OF
FIFTH
WHEEL
ON
TYPE
"
F
"
AIR
MAGNETIC
CIRCUIT
BREAKER
205396
VIEW
SHOWS
APPLICATION
OF
MANUAL
SPRING
CHARGING
HANDLE
ON
TYPE
"
F
"
AIR
MAGNETIC
CIRCUIT
BREAKER
205129
REMOVING
PHASE
BARRIERS
205130
TILTING
ARC
CHUTES
V
.
Courtesy of NationalSwitchgear.com

RECOMMENDED
SPARE
PARTS
TYPE
FC
-
150
/
250
/
500
Stored
Energy
Operated
Air
Circuit
Breaker
1200
Amperes
-
13
,
800
Volts
REFERENCE
INSTRUCTION
BOOK
NUMBER
BWX
-
6630
QUANTITY
NET
PRICE
1
-
5
Fig
.
5
or
Item
Style
Number
Bkrs
.
No
.
Each
more
Arcing
Contact
(
Stationary
)
71
-
112
-
966
-
501
1
3
$
10.20
3
-
9
Arcing
Contact
(
Moving
)
71
-
112
-
913
-
501
10.80
1
3
3
-
10
Main
Contact
(
One
Finger
)
7.50
71
-
112
-
903
-
501
6
18
3
-
11
Main
Contact
(
RH
Moving
)
38.40
71
-
208
-
255
-
502
1
3
-
19
3
Main
Contact
(
LH
Moving
)
38.40
71
-
208
-
255
-
501
1
3
3
-
18
Barrier
Stack
266.80
71
-
302
-
838
-
501
3
2
-
23
1
Hinge
Contact
Washer
(
Main
)
2.10
71
-
177
-
196
-
003
2
3
-
25
6
Hinge
Contact
Washer
(
Arcing
)
1.05
71
-
177
-
196
-
005
3
12
3
-
17
Primary
Contact
Assembly
12
.
15
71
-
201
-
738
-
502
1
6
1
-
3
"
Y
"
Relay
(
Give
Voltage
)
35.10
1
2
1
-
21
19.20
Closing
Solenoid
Coil
(
Give
Voltage
)
71
-
200
-
745
1
2
4
-
8
A
/
t
23.00
Trip
Solenoid
Coil
(
Give
Voltage
)
71
-
209
-
234
1
2
4
—
49
(
:
3.20
Latch
Check
Switch
W
—
666
—
303
1
2
5
-
47
16.60
Motor
Cutoff
Switch
71
-
210
-
390
-
801
1
2
5
-
60
138.15
Motor
(
Give
Voltage
)
71
-
210
-
046
1
2
4
-
48
1
.
Prices
are
subject
to
change
without
notice
.
F
.
O
.
B
.
FACTORY
.
Freight
Allowed
.
2
.
Terms
:
NET
CASH
-
30
Days
.
3
.
Estimated
Delivery
-
6
to
8
weeks
.
"
It
is
recommended
that
if
there
are
5
or
more
Identical
Breakers
a
complete
spare
breaker
element
should
be
purchased
in
addition
to
the
recommended
parts
specified
above
.
"
9
~
/
Courtesy of NationalSwitchgear.com

\
§
h
PART
I
.
DESCRIPTION
1.1
GENERAL
\
The
AlIis
-
Chalmers
RUPTAIR
movable
portion
consists
of
a
magnetic
circuit
breaker
for
metal
-
clad
switchgear
application
,
with
auxiliary
equipment
suitably
arranged
for
best
function
and
easy
instal
1
at
ion
.
As
part
of
standard
equipment
,
each
order
is
furnished
with
one
maintenance
closing
device
for
solenoid
operated
breakers
or
a
charging
crank
for
stored
energy
operated
units
.
X
/
\
>
The
RUPTAIR
magnetic
circuit
breaker
differs
essentially
from
oil
breakers
and
air
-
blast
breakers
in
that
it
.
does
not
depend
on
any
stored
medium
such
as
oil
or
compressed
air
for
arc
interruption
,
of
the
breaker
are
mounted
in
a
structural
steel
frame
,
operating
shaft
,
and
connecting
links
are
mounted
on
the
lower
section
of
the breaker
frame
and
are
well shielded
.
The
horizontal
terminal
studs
.
,
which
are
insulated
with
flame
retardent
tubing
,
extend
through
the
breaker
bracket and
support
the other
parts
of
the
electrical
circuit
.
Interruption
occurs
within
the
arc
chute
assemblies
which
are
mounted
at
the
top
,
over
the
contact
structures
.
The
component
parts
The
operator
,
the
X
I
\
\
\
S
1.2
METHOD
OF
ARC
INTERRUPTION
Interruption
is
accomplished
in
air
at
atmospheric
pressure
,
with
the
aid
of
a
self
-
induced
magnetic
blowout
field
and air
draft
.
At
the time
the
trip
coil
is
energized
,
current
is
being
carried
through
the
main
contacts
.
As
the
movable
contact
assembly
separates
from
the
stationary
contact
assembly
,
the
current
transfers
very
quickly
from
the main
contacts
to
the
arcing
contacts
,
thus
keeping
the
main
contact
erosion
to
a
minimum
.
(
For
breakers
equipped
with
tertiary
contacts
,
the
current
transfers
from
the
mains
,
to
the
tertiary
and
then
to
the
arcing
contacts
,
)
As
the
movable
contact
assembly
continues
its
stroke
,
the
arcing
contacts
part
,
drawing
a
power
arc
,
which
is
transferred
first
to
the
stationary
end
arc
runner
then
to
the
moving
end
arc runner
.
The
transfer
of
the
arc
to
the
arc
runners
establishes
the
full
flow
of
current
through
the
blowout
coils
,
setting
up
the
magnetic
field
which
,
in
accompaniment
with
natural
thermal
effects
of
the
heated
arc
,
the
configuration
of
the
current
carrying
circuit
,
etc
.
,
tend
to
force
the
arc
upward
into
the barrier
stack
.
The
cool
surfaces
of
the barrier
stack
cool
and deionize
the
arc
,
while
the
"
Vee
1
'
slots
in
the
stack
reduce
its
cross
section
and
elongate
it
.
W
v
^
9
The
arc
runners
are
made
of
wide
,
heavy
material
for
maximum
heat
dissi
-
pation
and
to
minimize
metal
vaporization
.
To
facilitate
interruption
of
low
currents
,
a
puffer
assembly
provides
a
movement
of
air
through
the
contact
area
to
aid the
magnetic
field
in
moving
the
arc
into
the
barrier
stack
.
All
of
the
above
effects
work
together
to
increase
the
resistance
of
the
arc
and
enable
it
to
be
extinguished
at
an
early
current
zero
.
Courtesy of NationalSwitchgear.com

\
PART
2
.
ADJUSTMENTS
§
2.1
GENERAL
\
\
The
breaker
has
been
completely
set
up
,
adjusted
and
tested
at
the
factory
.
C
\
V
Adjustments
should
not
have
to
be
made
nor
fastenings
tightened
when
the
breaker
is
received
.
If
there
is
visible
damage
or
breakage
due
to
shipment
,
storage
or
installation
,
the
adjustments
should
be
checked
and
corrected
,
if
necessary
,
before
breaker
is
operated
electrically
.
Manual
operation
(
use
maintenance
closing
device
)
of
breaker
should
be
used
for
preliminary
operation
to
see
that
all
parts
are
free
and
work
smoothly
.
The
bushings
and
other
insulating
parts
should
be
clean
and
dry
.
All
contact
surfaces
should
be
inspected
to
see
that
they
are
clean
and
smooth
.
(
Do
not
dress
silver
surfaces
)
.
Removal
of
all
phase
barriers
and
removal
or
raising
of
arc
chute
assemblies
gives
access
to
breaker
for
checking
adjustments
.
\
&
W
i
\
\
*
CAUTION
:
BEFORE
REMOVING
ANY
PART
,
MAKE
SURE
THAT
THE
BREAKER
AND
ITS
OPERATING
MECHANISM
IS
DISCONNECTED
FROM
ALL
ELECTRIC
POWER
AND
THAT
THIS
BREAKER
IS
IN
THE
OPEN
POSITION
.
V
I
V
\
\
i
\
t
Courtesy of NationalSwitchgear.com

(
‘
PART
3
Q
SE
-
3.1
STORED
ENERGY
OPERATOR
3
J
OPERATOR
The stored
energy
operator
is
an
operator
using
compressed
springs
to
close
a
circuit
breaker
.
A
motor
compresses
the
springs
through
a
gear
reduction
cam
and
latching
system
.
Energizing
the
spring
release
coil
operates
the
latch
to
release
the
charged
springs
and
close
the
breaker
.
3.2
CHARGING
THE
SPRINGS
\
A
motor
and
gear
unit
(
4
-
48
)
rotates
cam
(
4
-
34
)(
15
-
10
)
which
drives
follower
roll
(
4
-
35
(
15
-
J
)
-
Arm
(
4
-
2
)
(
15
—
9
)
rotates
clockwise
compressing
closing
springs
(
4
-
30
)
.
When
springs
are
charged
,
latch
(
4
-
18
) (
15
-
11
)
falls
behind
roll
(
4
-
54
)
(
15
-
H
)
.
When
cam
(
4
-
34
)
(
15
-
10
)
clears the
follower
roll
(
4
-
35
) (
15
"
J
)
>
only
the
latch
(
4
-
18
) (
15
-
11
)
holds
the
springs
charged
,
(
See
Figure
13
)
»
Cam
(
4
-
34
)
(
13
-
10
)
continues
to
rotate
clockwise
until it
hits
stop
(
5
-
30
)
on
arm
(
5
-
2
)
.
&
NS
V
\
s
\
5
A
charging
handle
is
furnished
to
charge
the
closing
springs
manually
.
Open
the control
power
circuit
and
engage
the
charging
handle
with
the
coupling
on
the front of the
motor
(
4
-
48
)
,
The
springs
are
charged
by
a
counterclockwise
rotation
of
the
handle
.
Full
spring
compression
will
be
realized
by
an
audible
snap
as
roll
(
4
-
54
)
(
13
—
H
)
drops
back
on
latch
(
4
-
18
)
(
13
-
11
)
when
cam
(
4
-
34
)
(
13
-
10
)
clears
follower
roll
(
4
-
35
)
(
13
—
J
)
-
Continue
to rotate
handle
until
motor
coupling
rotates
freely
without
load
.
M
\
VS
)
v
3
3
o
3
CLOSING
THE BREAKER
*
\
\
Energizing
the
spring
release
coil
(
5
-
50
)
rotates
arm
(
4
-
20
)
and
latch
(
4
-
18
) (
13
-
11
)
,
clockwise
,
thereby
releasing
the
closing
springs
,
The
closing springs
rotate
arm
(
4
—
2
)(
13
—
3
)
counterclockwise
which
pushes
link
(
13
-
8
)
upwards
while
it
rotates
arm
(
13
-
7
)
clockwise
about
fixed
center
(
13
—
F
)
•
The
closing
force
,
thus
applied
at
toggle
roll
(
4
-
55
) (
13
-
D
)
through
roll
(
4
-
54
)
(
13
-
H
)
moves
toggle
linkage
(
13
-
4
)
and
(
13
-
5
)
towards
a
position
which
is
slightly
over
the
straight
line
,
or
the
on
toggle
position
(
see
Figure
14
)
.
Crank
arms
(
14
-
2
)
and
(
14
-
3
)
rotate
counterclockwise
about
fixed
center
(
14
-
B
)
.
Crank
arm
(
14
-
2
)
closes
the
breaker
and
stretches
the
breaker
opening
springs
.
The
release
of
the
closing
springs
returns
arm
(
5
-
2
)(
14
-
9
)
to
its
position
shown
in
Fig
.
14
.
to
go
by
stop
(
5
“
30
)
and
be
returned
,
along
with
the
motor
gearing
,
to
the
initial
on
engaged
position
by
spring
(
5
-
32
)
.
gear
unit
then
returns
links
(
14
-
7
,
8
and
9
)
to
their
positions
shown
in
Figure
13
.
Vi
Cam
(
5
-
34
)
(
14
-
10
)
is
now
allowed
The
motor
and
Courtesy of NationalSwitchgear.com

3.4
MANUALLY
SLOW
CLOSING
THE
BREAKER
r
-
w
Manually
slow
closing
the
breaker
is
accomplished
by
manually
charging
the
springs
as
described
in
Section
3.2
except
that
the
charging
handle
is
rotated
only
until
the
trip
latch
(
4
-
9
)
(
13
-
12
)
drops
in
front
of
roll
(
4
-
56
)
(
13
-
E
)
.
•
<
v
CAUTION
:
BEFORE
CONTINUING
BE
SURE
-
1
.
Cam
(
4
-
34
)
(
13
-
10
)
is
engaged
with
following
roll
(
4
-
35
)
(
13
-
J
)
.
2
.
Latch
(
4
-
18
)
(
13
-
11
)
is
NOT
engaged
with
roll
(
4
-
54
)(
13
-
H
)
.
\
The
breaker
can
now
be
closed
by
slowly
turning
charging
handle
clockwise
.
The
breaker
is
fully
closed
when
arm
(
4
-
2
)
(
13
—
9
)
is
against
stop
(
4
-
16
)
.
\
»
3.5
OPENING
THE
BREAKER
X
\
I
Opening
the
breaker
is
accomplished
either
manually
or
electrically
.
Manually
the
breaker
is
tripped
by
pushing
on
the
trip
button
which
causes
the
trip
pin
to
move
downward
,
thus
rotating
trip
latch
(
14
-
12
)
in
a
clockwise
direction
.
Temporarily
fixed
center
(
14
-
E
)
is
thereby
released
,
enabling
link
(
14
-
6
)
to
rotate
clockwise
about
fixed
center
(
14
-
F
)
.
Since
the
restraining
force
on
the
breaker
opening
springs
is
now
released
,
they
act
to
rotate
crank
arms
(
14
-
2
)
and
(
14
-
3
)
clockwise
about
fixed
center
(
14
-
B
)
and
open
the
breaker
.
Toggle
linkages
(
14
-
4
)
and
(
14
-
5
)
collapse
to
their
posi
-
tion
shown
in
(
Figure
15
)
if
the
closing
springs
are
not
charged
.
If
springs
are
charged
,
the
linkage
col
lapses
.
to
positions
shown
in
Figure
13
.
Electrical
tripping
is
as
above
except
that
the
trip
pin
is
actuated
by
the
trip
coil
(
4
-
49
)
.
NS
\
>
The
tripping
action
described
above
can
take
place
at
any
time
during
a
closing
operation
either
manual
or
electrical
,
and
regardless
of
whether
the
closing
springs
are
charged
or
discharged
.
Thus
the
mechanism
is
electrically
and
mechanically
trip
free
in
any
position
.
Na
3.6
ARM
(
4
-
2
)
Add
or
remove
shims
(
4
-
10
)
so
that
when
arm
(
4
-
2
)
is
in
discharged
position
,
the
clearance
between
follower
roll
(
4
-
35
)
and
the
smallest
radius
of
cam
(
4
-
34
)
is
3
/
32
to
5
/
32
.
Courtesy of NationalSwitchgear.com

*
r
-
3.7
MAIN
TOGGLE
ROLL
(
Fig
.
5
)
When
breaker
is
in
closed
position
with
roll
(
5
-
55
)
against
block
(
5
-
15
)
,
center
of
main
toggle
roll
(
5
~
55
)
should
be
3
/
16
to
5
/
16
beyond
line
of
centers
of
latch
roll
(
5
~
56
)
and
pin
(
5
~
3
)
.
ment
is
made
by
adding
or
removing
shims
(
5
-
8
)
.
Adj
ust
-
3.9
CLOSING
SPRINGS
(
Applicable
only
on
the
FC
1000
and
FA
350
breakers
)
,
discharged
,
there
should
be
1
/
4
to
1
/
2
clearance
between
plate
-
(
4
-
19
)
and
spring
washer
.
Adjustment
is
made
by
moving
nuts
(
4
-
44
)
.
With
springs
i
*
3.10
TRIP
LATCH
(
Fig
.
4
)
The
trip
latch
(
5
-
9
)
should
engage
its
roll
(
5
-
56
)
1
/
8
to
3
/
16
above
the
lower
edge
of
the
latch
face
.
Adjustment
is
made
by
screw
(
4
-
36
)
.
trip
pin
(
5
-
49
A
)
and
the
trip
latch
(
5
~
9
)
(
See
Section
3.12
.
)
With
the
springs
charged
and
the
breaker
open
,
the
trip
latch
(
5
~
9
)
should
clear
its
latch
roll
(
5
-
5
t
>
)
by
1
/
64
to
3
/
64
.
Adjustment
is
made
by
screw
(
4
-
7
)
.
W
Note
that
this
adjustment
affects
the
clearance
between
the
i
$
*
*
3
J
1
CLOSING
LATCH
(
Fig
.
4
Sr
5
)
sS
The
closing
latch
(
5
*
18
)
should
engage
its
roll
(
5
“
54
)
1
/
8
to
3
/
16
above
the
lower
edge
of
the
latch
face
.
Adjustment
is
made
by
screw
(
4
-
42
)
.
trip
pin
(
5
-
50
A
)
and
the
arm
(
5
-
20
)
(
See
Section
3.12
)
.
Note
that
this
adjustment
affects
the
clearance
between
the
\
\
10
TRIPPING
AND
CLOSING
SOLENOID
(
Fig
.
5
)
3.12
\
The
tripping
solenoid
(
5
-
49
)
and
the
closing
solenoid
(
5
“
50
)
action
and
adjustments
are
identical
.
Each
solenoid
has
been
adjusted
in
the
factory
and
should
require
no
further
adjustment
.
If
readjustment
is
required
it
should
be
made
only
when
the
trip
and
closing
latch
bites
are
in
correct
adjustment
(
see
Sections
3.10
and
3.11
)
.
The
armature
should
move
freely
and
have
no
binds
.
The
travel
of
the
armature
should
be
such
that
slow
manual
actuation
will
trip
the
latch
and
have
1
/
16
to
3
/
32
aftertravel
.
Adjustment
is
made
by
shimming
the
solenoid
with
washers
on
the
mounting
screws
.
Courtesy of NationalSwitchgear.com

(
0
With
the
coils
deenergized
there
should
be
3
/
32
to
5
/
32
clearance
between
the
trip
latch
(
5
*
9
)
and
the
trip
pin
(
5
-
49
A
)
on
the
tripping
solenoid
,
and
between
the
closing
arm
(
5
-
20
)
and
the
trip
pin
(
5
-
50
A
)
on
the
closing
solenoid
,
Adjustments
are
made
by
raising
or
lowering
the
respective
hex
nuts
(
5
-
6
and
(
5
-
60
)
,
A
3.13
AUXILIARY
EQUIPMENT
The
auxiliary
equipment
consists
of
a
secondary
transfer
device
,
control
relay
,
auxiliary
switch
and
closing
rectifier
as
required
.
These
are
mounted
on
the
lower
portion
of
the
breaker
.
The
secondary
finger
contacts
are
wired
such
that
when
movable
portion
is
moved
into
test
or
operating
position
in
the
cubicle
the
finger
contacts
engage
the
stationary
contacts
to
complete
the
control
circuit
for
operation
of
the
breaker
.
3.14
AUXILIARY
SWITCH
(
Fig
,
11
)
The
auxiliary
switch
(
1
-
15
)
has
been
adjusted
at
the
factory
and
should
normally
not
require
further
adjustment
.
Each
rotor
(
11
-
3
)
can
be
adjusted
individually
in
steps
of
15
degrees
merely
by
pressing
the
contact
to
one
side
against
the
spring
and
rotating
it
within
its
insulated
rotor
housing
until
it
snaps
into
the
desired
position
.
v
\
J
\
3
3.15
INTERLOCK
PLUNGER
(
Fig
,
1
)
\
!
The
foot
lever
(
1
-
20
)
operates
the
interlock
plunger
(
1
-
18
)
as
well
as
the
trip
latch
and
the
closing
latch
.
Depressing
the
lever
trips
the
breaker
,
releases
the
closing
spring
and
raises
plunger
(
1
-
18
)
sufficiently
to
release
the
breaker
allowing
it
to
be
moved
in
the
cubicle
,
The
interlock
is
in
proper
adjustment
when
the
plunger
(
1
-
18
)
is
positioned
to
1
-
11
/
16
to
1
-
13
/
16
above
the
floor
line
,
and
causes
tripping
of
breaker
contacts
when
it
is
raised
to
a
level
not
more
than
2
-
1
/
16
above
the
floor
line
,
N
V
o
vs
The
latch
tripping
rod
associated
with
the
foot
lever
should
be
clear
of
the
trip
latch
(
4
-
9
)
by
1
/
32
to
1
/
16
.
Adjustment
is
made
by
changing
the
effective
length
of
the
yoke
attaching
the
foot
lever
to
the
interlock
plunger
.
The
interlock
rod
(
4
-
13
)
should
not
touch
the
closing
arm
(
4
-
20
)
until
after
the
breaker
is
trip
free
.
Adjustment
is
made
by
changing
the
effective
length
of
the
eyebolt
connecting
the
foot
lever
to
the
interlock
rod
.
x
Courtesy of NationalSwitchgear.com