Allis-Chalmers FB-500A-FC-750A User manual

AND
AUXILIARY
EQUIPMENT
(
STORED
-
ENERGY
OPERATOR
)
Book
No
.
BWX
-
6732
or
BWX
-
6632
-
5
November
1
,
1968
>
V
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r
t
K
i
/
n
i
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i
l
WM
t
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i
»
•
A
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.
v
.
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:
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i
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*
•
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•
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:
*
-
v
:
'
V
v
#
Courtesy of NationalSwitchgear.com

*
.
.
A
TABLE
OF
CONTENTS
SECTION
NO
.
CONTENTS
PART
1
DESCRIPTION
GENERAL
METHOD
OF
ARC
INTERRUPTION
.
.
..
PART
2
ADJUSTMENTS
GENERAL
PART
3
SOLENOID
OPERATOR
SOLENOID
OPERATOR
CLOSING
OPENING
AUXILIARY
EQUIPMENT
AUXILIARY
SWITCH
LIMIT
SWITCH
LATCH
CHECK
SWITCH
INTERLOCK
PLUNGER
TRIP
LATCH
TRIPPING
SOLENOID
:
.
.
.
PROP
LATCH
PART
4
DISCONNECT
SECTION
BREAKER
MECHANISM
CONTACTS
SERVICING
CONTACTS
BREAKER
TIMING
ARCING
CONTACT
HINGE
JOINT
CONTACT
PRESSURE
ON
HINGE
JOINT
CONTACT
ALIGNMENT
CONTACT
LEAD
CONTACT
STROKE
PARTS
ARC
CHUTE
ASSEMBLY
ARC
CHUTE
ASSEMBLY
PHASE
BARRIERS
TILTING
ARC
CHUTES
BARRIER
STACKS
1.1
1.2
2.1
3.1
3.2
3.3
*
I
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
4.1
4.2
4.2
A
4.3
4.4
4.5
4.6
4.7
4.8
5.1
5.2
5.3
5.4
LIST
OF
ILLUSTRATIONS
TYPICAL
MAGNETIC
BREAKER
TYPICAL
ARC
CHUTE
TYPICAL
STUD
&
SUPPORT
TYPICAL
OPERATOR
ASSEMBLY
TYPICAL
AUXILIARY
SWITCH
TYPICAL
OPERATOR
LINKAGE
DIAGRAM
72
-
420
-
057
-
401
71
-
401
-
532
-
401
71
-
401
-
524
-
401
71
-
320
-
041
-
401
71
-
301
-
758
71
-
400
-
246
-
401
FIGURE
1
FIGURE
2
FIGURE
3
FIGURE
4
FIGURE
11
FIGURE
13
14
'
15
205129
205130
REMOVING
PHASE
BARRIERS
TILTING
ARC
CHUTES
S
.
'
Courtesy of NationalSwitchgear.com

ALLIS
-
CHALMERS
LIST
OF
ILLUSTRATIONS
FB
-
500
-
FC
-
750
RUPTAJR
MAGNETIC
POWER
CIRCUIT
BREAKER
AND
AUXILIARY
EQUIPMENT
(
STORED
ENERGY
OPERATOR
)
FIGURE
1
TYPICAL
MAGNETIC
BREAKER
71
-
401
-
531
-
401
FIGURE
2
TYPICAL
ARC
CHUTE
71
-
401
-
532
-
401
FIGURE
3
TYPICAL
STUD
&
SUPPORT
71
-
401
-
524
-
401
FIGURE
4
TYPICAL
STORED
ENERGY
OPERATOR
71
-
303
-
129
-
40
)
FIGURE
4
A
TYPICAL
SPRING
DISCHARGE
72
-
220
-
161
-
401
FIGURE
5
OPERATOR
ADJUSTMENTS
71
-
209
-
564
-
401
FIGURE
8
TYPICAL
CONTROL
SWITCH
72
-
320
-
033
-
401
FIGURE
II
TYPICAL
AUXILIARY
SWITCH
71
-
301
-
758
FIGURE
13
TYPICAL
OPERATOR
LINKAGE
DIAGRAM
71
-
116
-
481
14
15
VIEW
SHOWS
APPLICATION
OF
FIFTH
WHEEL
ON
TYPE
"
F
"
AIR
MAGNETIC
CIRCUIT
BREAKER
205391
LEFT
FRONT
VIEW
OF
TYPE
"
F
"
AIR
MAGNETIC
CIRCUIT
BREAKER
WITH
TYPE
SE
-
3
STORED
ENERGY
OPERATOR
205399
VIEW
SHOWS
APPLICATION
OF
MANUAL
SPRING
CHARGING
HANDLE
ON
TYPE
"
F
"
AIR
MAGNETIC
CIRCUIT
BREAKER
205396
205129
REMOVING
PHASE
BARRIERS
205130
TILTING
ARC
CHUTES
Courtesy of NationalSwitchgear.com

PART
I
.
DESCRIPTION
GENERAL
The
A
11
is
-
Cha
1
mers
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
ation
.
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
.
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
.
The
component
parts
of
the
breaker
are
mounted
in
a
structural
steel
frame
.
The
operator
,
the
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
.
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
"
slots
in
the
stack
reduce
its
cross
section
and
elongate
it
.
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
i n
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
.
Adjustments
should
not
have
to
be
made
nor
fastenings
tightened
when
the
breaker
is
received
,
to
shipment
,
storage
or
installation
,
the
adjustments
should
be
checked
and
corrected
,
if
necessary
,
before
breaker
is
operated
electrically
.
If
there
is
visible
damage
or
breakage
due
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
.
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
.
CAUTI
ON
:
\
Courtesy of NationalSwitchgear.com

PART
3
.
SE
-
3
»
STORED
ENERGY
OPERATOR
3
J
OPERATOR
I
The stored
energy
operator
is
an
pperator
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
05
-
J
)
.
Arm
(
4
-
2
)
(
15
-
9
)
rotates
clockwise
compressing
closing
springs
(
4
r
30
)
.
When
springs
are
charged
,
latch
(
4
-
18
)
(
15
-
11
)
falls
behind
roll
(
4
-
54
)
(
15
“
H
)
.
(
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
)
.
When
cam
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
.
3.3
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
-
9
)
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
.
Cam
(
5
-
34
) (
14
-
10
)
is
now
allowed
to
go
by
stop
(
5
“
30
)
and
be
returned
,
along
with
the
motor
gearing
,
to
the
initial
on
engaged
position
by
spring
(
5
-
32
)
.
The
motor
and
gear
unit
then
returns
links
(
14
-
7
,
8
and
9
)
to
their
positions
shown
in
Figure
13
.
Courtesy of NationalSwitchgear.com

3
.
4
MANUALLY
SLOW
CLOSING
THE
BREAKER
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
)
.
BEFORE
CONTINUING
BE
SURE
-
CAUTION
:
1
.
Cam
(
4
-
34
)
(
13
-
10
)
is
engaged
with
following
roll
(
4
-
35
)
03
-
J
)
.
2
.
Latch
(
4
-
id
)
(
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
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
)
.
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
.
3.6
DELETED
Courtesy of NationalSwitchgear.com

3.7
MA
3
N
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
)
.
Adjust
-
ment
is
made
by
adding
or
removing
shims
(
5
-
8
)
.
3.9
CLOSING
SPRINGS
(
Applicable
only
on
the
FC
1000
and
FA
350
breakers
)
.
With
springs
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
)
.
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
)
.
Note
that
this
adjustment
affects
the
clearance
between
the
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
-
56
)
by
1
/
64
to
3
/
64
.
Adjustment
is
made
by
screw
(
4
-
7
)
.
I
3.11
CLOSING
LATCH
(
Fig
.
4
&
5
)
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
)
.
Note
that
this
adjustment
affects
the
clearance
between
the
trip
pin
(
5
-
50
A
)
and
the
arm
(
5
-
20
)
(
See
Section
3.12
)
.
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
havel
/
32
to
l
/
l
6
aftertravel
.
Adjustment
is
made
by
shimming
the
|
solenoid
with
washers
on
the
mounting
screws
.
Courtesy of NationalSwitchgear.com

With
the
COL
.
Is
deenergized
there
should
be
1
/
8
to
3
/
16
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
)
.
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
linger
contacts
engage
the
stationary
contacts
to
complete
the
control
circuit
for
operation
of
the
breaker
.
3.14
AUXILIARY
SWITCH
(
Figure
II
)
The
auxiliary
switch
(
1
-
15
)
has
been
adjusted
at
the
factory
and
should
normally
not
require
further
adjustment
.
Each
rotor
(
11
-
3
)
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
.
can
3.15
INTERLOCK
PLUNGER
(
Figure
1
)
The
foot
lever
(
1
-
20
)
operates
the
interlock
plunger
(
l
-
18
)
as
well
as
the
trip
latch
.
Depressing
the
lever
trips
the
breaker
and
raises
plunger
(
1
-
18
)
sufficiently
to
release
th
6
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
.
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
.
3.15
A
SPRING
DISCHARGE
(
Figure
4
A
)
During
insertion
and
removal
of
the
circuit
breaker
from
the
cubicle
the
closing
springs
of
the
operator
will
automatically
discharge
.
This
is
accomplished
when
paddle
(
4
A
-
6
)
is
moved
upward
upon
coming
in
contact
with
cubicle
stop
angle
(
4
A
-
5
)
.
This
,
in
turn
,
(
Figure
4
)
disengages
closing
latch
(
4
-
18
)
from
latch
roll
(
4
-
54
)
allowing
closing
springs
to
discharge
.
If
adjustment
i
.
s
required
,
proceed
as
follows
:
Remove
.
circuit
breaker
from
the
cubicle
.
Be
sure
closing
springs
are
discharqed
.
remove
cotter
pin
(
4
A
-
7
)
.
nut
(
4
A
-
4
)
.
pin
(
4
A
-
8
)
and
Insert
cotter
pin
(
4
A
-
7
)
in
rod
.
Charge
closing
springs
and
check
automatic
discharge
feature
as
explained
previous
1
y
.
\
With
paddle
(
4
A
-
6
)
.
in
the
vertical
position
(
as
shown
)
Remove
rod
(
4
A
-
3
)
from
link
(
4
A
-
1
)
.
Loosen
Adjust
rod
until
there
is
1
/
16
+
1
/
16
-
0
clearance
between
arm
(
4
A
-
2
)
as
shown
.
Insert
rod
(
4
A
-
3
)
into
link
(
4
A
-
I
)
.
Tighten
nut
(
4
A
-
4
)
.
\
Courtesy of NationalSwitchgear.com

•
J
3
.
»
6
OPERATOR
CONTROL
(
Fig
.
8
)
The
normal
control for
this
operator
has
been
incorporated
in
one
switch
assembly
located
at
the
rear
of
the
unit
.
It
consists
of
two
heavy
duty
toggle
switches
(
6
)
operated
by
a
common
linkage
(
4
)
from
a
motor
switch
cam
(
1
)
on
the
main
charging
cam
shaft
.
\
?
Referring
to
the
breaker
wiring
diagram
furnished
with
'
the
installation
,
the
88
-
1
and
88
-
2
switches
are
shown
with
the
springs
discharged
.
i
:
As
the
main
charging
cam
rotates
charging
the
main
closing
springs
,
the
motor
switch
.
cam
rotates
.
When
the
closing
springs
are
charged
the
motor
switch
cam
throws
the
common
linkage
to
the
88
-
1
and
88
-
2
switch
shutting
off
the
motor
.
When
the
closing
springs
are
discharged
the
cam
is
freed
and
the
reset
spring
(
5
-
32
)
rotates
the
cam
shaft
releasing
the
switch
which
closes
the
motor
circuit
and
starts
the
spring
charge
.
.
•
\
•
•
‘
•
*
*
The
88
switch
assembly
is
factory
adjusted
and
pinned
in
position
.
If
readjustment
is
required
remove
roll
pin
(
2
)
,
loosen
nut
(
3
)
,
and
rotate
the
switch
assembly
clockwise
as
.
far
as
.
it
.
;
w
a
11
travel
.
*
Refer
to
Section
3.2
Manual
»
y
.
charge
the
closing springs
fully
.
Place
a
1
/
32
shim
between
one
of
the
switch
rolls
(
5
)
and
arm
(
4
)
.
'
Slowly
rotate
the
switch
assembly
counterclockwise
until
the
switch
roi
1
reaches
its
extreme
travel
.
Tighten
nut
,
(
3
)
.
Relocate
and
drill
.
190
diameter
hole
(
at
a
convenient location
)
and
drive
in
roll
,
pin
(
2
)
0
Remove
1
/
32
shim
.
)
Courtesy of NationalSwitchgear.com

\
{
3
>
17
RESET
RELAY
(
For
Instantaneous
Reclosure
Service
Only
)
The
ALLIS
-
CHALMERS
RESET
RELAY
designed
for
use
in
circuit
breaker
control
is
a
rugged
electronic
solid
state
time
delay
which
operates
a
small
relay
.
The
relay
contacts
are
rated
at
15
amps
.
The
relay
closing
time
is
not
affected
by
broad
variance
of
voltage
'
and
current
well
beyond
the
standard
circuit
breaker
control
limits
.
The
time
delay
error
caused
by
temperature
is
minor
being
less
than
3
%
from
-
20
°
C
to
*
f
80
°
C
and
not
over
5
%
to
-
40
°
C
.
The
voltage
regulator
and
timing
circuits
are
mounted
on
a
printed
circuit
board
and
incapsulated
in
a
resilient
material
for
shock
resistance
.
The
controlled
supply
voltage
charges
the
capacitor
(
C
|
)
through
the
time
rate
determining
resistor
R
,
to
the
triggering
voltage
of
the
unijunction
transistor
(
UJT
)
which
activates
the
SCR
energizing
the
relay
coi
1
.
\
Courtesy of NationalSwitchgear.com

4
-
*
A
o
a
:
i
o
J
-
J
5
£
a
.
>
«
*
:
o
^
<
N
3
t
:
Q
*
«
g
I
V
-
»
,
,
/
?
£
>
A
o
f
D
,
nH
i
+
/
?
J
82
UJT
E
Vc
SCR
4
=
RELAY
rV
Bi
,
i
“
*
I
Cl
±
R
2
C
?
TYPICAL
RESET
RELAY
CIRCUIT
£
4
—
o
}
A
constant
voltage
Vc
is
maintained
across
the
terminals
AB
by
the
two
zener
diodes
D
|
and
02
*
Resistor
Rd
drops
the
supply
voltage
to
a
value
above
the
diode
control
voltage
and
the
diodes
further
reduce
the
voltage
to
the
control
voltage
value
,
Vc
.
The
control
voltage
Vc
causes
the
diodes
to
conduct
and
an
increase
or
decrease
.
in
supply
voltage
will
produce
a
corresponding
change
in
the
current
which
causes
a
change
in
the
voltage
drop
across
Rd
equal
to
the
change
in
supply
voltage
.
To
summarize
,
an
increase
or
decrease
in
supply
voltage
will
not
affect
the
constant
voltage
drop
Vc
across
the
diodes
.
Two
diodes
in
series
are
used
because
they
provide
more
precise
voltage
regulation
than
one
diode
.
The
unijunction
transistor
(
UJT
)
is
a
switch
which
when
turned
on
will
allow
a
short
pulse
of
relatively
high
current
to
flow
and
will
then
shut
off
.
The
terminals
EBl
,
of
the
UJT
are
an
open
circuit
until
the
voltage
at
E
exceeds
a
precise
level
Vp
.
In
other
words
the
UJT
does
not
allow
current
to
flow
from
point
E
to
point
B
]
until
the
UJT
is
turned
on
by
the
firing
voltage
Vp
.
The
voltage
drop
Vc
across
the
terminals
AB
charges
the
capacitor
C
|
through
the
variable
resistor
Rj
.
The
time
that
it
takes
the
capacitor
C
]
to
charge
to
the
firing
voltage
(
Vp
)
of
the
UJT
is
the
time
delay
,
and
is
controlled
by
the
variable
resistor
R
|
R
]
is
preset
in
the
factory
for
a
delay
often
cycles
and
locked
in
place
by
the
stem
locking
nut
.
A
5
°
change
in
resistor
setting
would
mean
a
change
in
delay
of
approximately
1
/
2
cycle
.
The
unit
is
adjustable
from
an
approximately
instantaneous
to
a
60
cycle
delay
.
Any
readjustment
should
be
made
using
a
cycle
counter
or
equivalent
for
timing
.
When
the
voltage
drop
across
*
the
.
capac
i
tor
and
therefore
at
point
E
,
exceeds
Vp
the
terminals
EB
)
vact
as
a
short
circuit
and
the
UJT
discharges
the
capacitor
through
R
2
and
the
gate
terminal
of
the
silicon
controlled
rectifier
(
SCR
)
.
That
is
,
the
UJT
allows
current
to
flow
from
the
capacitor
at
point
E
to
point
Bi
and
into
the
gate
terminal
of
the
SCR
.
1
Courtesy of NationalSwitchgear.com

A
t
•
The
SCR
is
a
latch
type
switch
.
Normally
it
blocks
the
flow
of
current
through
the
relay
R
.
When
the
gate
terminal
rece
:
ves
a
current
pulse
from
the
capacitor
discharging
through
the
UJT
,
the
SCR
allows
current
,
to
flow
through
the
relay
R
.
The
SCR
conducts
even
after
the
pulse
is
removed
.
The
relay
contacts
R
close
allowing
current
to
flow
through
the
spring
release
coil
circuit
.
The
gate
terminal
of
the
SCR
is
protected
fr
^
om
random
high
frequency
pulse
by
capacitor
C
2
which
provides
a
short
circuit
to
ground
for
these
pulses
,
capacitor
C
2
is
negligible
at
high
frequencies
and
the
capacitor
allows
current
to
flow
through
it
.
In
other
words
the
reactance
of
the
\
\
Courtesy of NationalSwitchgear.com

PART
4
.
DISCONNECT
SECTION
4
.
1
BREAKER
MECHANISM
The
breaker
mechanism
consists
essentially
of
movable
contact
arms
and
insulating
links
which
connect
the
contact
arms
to
the
operator
mechanism
.
4.2
CONTACTS
(
Fig
.
3
)
The
stationary
contact
structure
of
each
phase
is
made
up
of
two
sets
of
contacts
;
main
current
carrying
,
and
arcing
,
which
are
mounted
on
the
upper
bushing
stud
.
The
movable
contacts
are
attached
to contact
arms
that
pivot
from
the
end
of
the
lower
bushing
stud
.
Transfer
areas
qf
current
carrying
contacts
are
silver
plated
and
contact
surfaces
are
of
si
1
ver
-
tungsten
alloy
.
The
main
current
carrying
contacts
are
finger
type
and
engage
with
a
wiping
action
.
The
arcing
contacts
are
butt
type
.
All
contacts
are
backed
by
steel
springs giving
positive
contact
pressure
when
engaged
.
4.2
A
SERVICING
CONTACTS
The
frequency
of
contact
inspection
depends
on
the
severity
of
service
to
which the breaker is
subjected
.
There
are
two
areas
which
normally
require
service
inspection
:
Badly
pitted
or
burned
Stationary
and
moving
main
and
arcing
contacts
,
contacts
should
be
replaced
.
A
.
Hinge
joints
.
Remove
the
disconnect
arms
as
a
unit
by
removing
screw
(
3
-
24
)
,
nut
(
3
-
14
)
and
spring
washers
(
3
-
23
)
.
Carefully
jjispect
all
contact
surfaces
.
Silver
washers
(
3
-
25
)
and
adjacent
surfaces
should
be
clean
and
free
of
roughness
or
galling
.
Lubricate
washers
(
3
-
25
)
and
mating
surfaces
by
rubbing
.
in
microfine
dry
graphite
,
used
spar
-
ingly
.
Remove
excess
graphite
.
Reassemble
,
adjusting
hinge joint
pressure
as
described
in
Section
4.5
.
B
.
4.3
BREAKER
TIMING
Check
the
contact
adjustment
and breaker
timing
,
also check
adjustments
of
auxiliary
equipment
and
see
that
it
functions
properly
.
A
comparison
of
breaker
timing
at
any
period
of
maintenance
with
that
taken
when
the
breaker
was
new
wi
11
immediately
indicate
a
condition
of
maladjustment
or
friction
should
the
timing
vary
more
than
1
/
2
cycle
on
opening
or
2
cycles
on
closing
with
the
same
coils
.
A
hole
is
provided
in
the
movable
contact
arm
for
the
purpose
of
attaching
a
speed
analyzer
connection
.
4.4
ARCING
CONTACT
HINGE
JOINT
(
Fig
.
3
)
The
arcing
contact
hinge
joint
is
in
proper
adjustment
when
each
spring
washer
(
3
~
15
)
is
deflected
approximately
0.015
inches
.
This
adjustment
is obtained
by
tightening
nut
(
3
-
4
)
until
all
parts
just
touch
,
then
tighten
the
nut
3
/
k
to
.
1
turn
more
.
Courtesy of NationalSwitchgear.com

\
4.5
CONTACT
PRESSURE
OF
HINGE
JOINT
(
Fig
.
3
)
The
hinge
joint
contact
pressure
is
in
proper
adjustment
when
a
pull
of
from
7
to
9
pounds
on
the
5
kv
,
and
from
5
to
7
pounds
on
the
15
kv
is
required
to
move
the
disconnect
toward
the
open
position
.
This
measurement
is
obtained
as
follows
:
Remove
pin
(
1
-
46
)
and
detach
link
(
1
-
47
)
from
the
disconnect
arms
(
3
-
18
)
and
(
3
-
19
)
.
make
"
.
'
and
10
-
1
/
2
inches
on
the
15
kv
,
above
screw
(
3
-
24
)
,
and
in
a
direction
perpendicuIar
to
the
longest
edge
of
the
disconnect
arm
.
pull
to
move
the
disconnect
toward
the
open
position
.
Move
the
disconnect
to
a
position
just
short
of
"
contact
Attach
a
spring
scale
to
the
disconnect
8
-
1
/
2
inches
on
the
5
kv
,
Measure
the
Adjustment
is
made
by
tightening
(
or
loosening
)
nut
(
3
-
14
)
.
Before
attaching
link
(
1
-
47
)
-
to
disconnect
arms
(
3
-
18
)
and
(
3
-
19
)
,
check
contact
alignment
(
section
4.6
)
and
contact
lead
(
section
4.7
)
.
4
,
6
CONTACT
ALIGNMENT
(
Fig
.
3
)
The
contacts
are
an
integral
part
of
the
bushing
assemblies
and
are
carefully
aligned
with
the
upper
and
lower
bushings
before
shipment
and
no
further
adjustment
should
normally
be
necessary
.
The
horizontal
pairs
of
main
contact
fingers
in
each
phase
should
"
make
with
the
moving
contact
simu
1
taneousIy
.
(
Note
:
Contacts
on
different
phases
should
not
necessarily
"
make
"
simultaneously
,
they
can
vary
as
much
as
1
/
32
inches
.
)
If
not
already
detached
,
remove
pin
(
1
-
46
)
and
detach
link
(
1
-
47
)
from
disconnect
arms
(
3
-
18
)
and
0
-
19
)
.
On
MA
-
75
/
150
B
and
FC
-
150
/
250
/
500
Breakers
-
Detach
arcing
contact
(
3
-
10
)
from
yoke
(
3
-
2
)
by
removing
pin
(
3
-
26
)
.
Move
the
disconnect
toward
the
closed
position
until
it
just
touches
a
main
contact
finger
(
See
Fig
.
3
,
View
A
-
A
,
main
contacts
engaging
)
.
Dimension
c
should
then
be
no
greater
than
.
020
inches
,
with
one
contact
touching
.
On
MA
-
250
/
350
B
,
FB
-
250
/
500
and
FC
-
750
Breakers
-
Remove
pin
(
1
-
46
)
and
detach
link
(
1
-
47
)
from
disconnect
arms
(
3
-
18
)
and
(
3
-
19
)
of
two
phases
only
.
With
the
maintenance
closing
device
,
move
the
disconnects
of
the
remaining
phase
toward
the
closed
position
until
a
main
contact
finger
(
3
-
11
)
is
touched
.
Dimension
£
should
then
be
no
greater
than
.
020
-
inches
,
with
one
contact
touching
.
Adjustment
is
made
by
loosening
two
nuts
(
3
-
22
)
and
rotating
the
contact
assembly
.
Alignment
(
dimension
c
)
should
be
checked
after
tightening
nuts
(
3
-
22
)
.
\
.
v
*
-
Courtesy of NationalSwitchgear.com

Alignment
is
checked
and
adjusted
on
each
phase
separately
,
there
are
no
binds
between
contacts
(
3
-
11
)
preventing
proper
wiping
action
with
the
disconnect
arms
.
Be
sure
Attach
arcing
contact
(
3
-
10
)
to
yoke
(
3
-
2
)
,
if
detached
,
but
check
contact
lead
(
Section
4.7
)
,
before
attaching
link
(
1
-
47
)
to
disconnect
arms
(
3
—
18
)
and
(
3
—
19
)
•
4.7
CONTACT
LEAD
(
Fig
.
3
)
Contact
lead
is
adjusted
on
breakers
in
the
factory
and
should
normally
not
require
further
adjustment
.
It
should
,
however
,
be
checked
on
each
phase
separately
and
only
with
contact
alignment
on
the
phase
in
correct
adjustment
(
see
Section
4.6
)
.
The
arcing
contacts
(
3
-
9
,
10
,
27
,
28
)
should
"
make
11
before
the
main
contacts
.
Measure
and
adjust
each
phase
separately
as
follows
:
If
not
already
detached
,
remove
pin
(
1
-
46
)
to
detach
.
link
(
1
-
47
)
from
disconnect
arms
(
3
-
18
)
and
(
3
-
19
)
•
Move
the
disconnect
toward
the
closed
position
until
the
arcing
contacts
just
touch
(
See
Figure
3
,
View
A
-
A
,
Arcing
Contact
Engaging
)
.
The
shortest
gap
between
the
bottom
contact
fingers
•
(
3
-
1
I
)
and
the
contact
on
the
disconnect
arms
(
3
-
18
)
and
(
3
-
19
)
should
be
7
/
32
to
1
/
4
inches
.
(
Dimension
b
_
in
View
A
-
A
of
Figure
3
.
)
made
by
opening
or
closing
the
gap
with
nut
(
3
-
1
)
.
Adjustment
is
Reconnect
link
(
1
-
47
)
to
disconnect
arms
(
3
-
18
)
and
(
3
-
19
)
using
pin
(
1
-
46
)
.
4.8
CONTACT
STROKE
(
Fig
.
3
)
Contact
stroke
should
be
checked
and
adjusted
only
when
the
contacts
are
in
proper
alignment
(
see
Section
4.6
)
.
In
order
to
ensure
proper
wiping
action
and
contact
pressure
,
the
stroke
of
the
disconnect
must
be
maintained
in
proper
adjustment
.
Check
and
adjust
as
follows
:
With
the
breaker
latched
,
the
spread
of
the
contacts
(
2
a
in
View
A
-
A
,
of
Figure
3
)
,
on
the
top
pair
of
fingers
should
be
1
/
8
to
3
/
l
6
n
.
Adjustment
is
made
with
the
breaker
in
the
open
position
by
increasing
or
decreasing
the
effective
length
of
link
(
1
-
47
)
by
means
of
nuts
(
1
-
10
)
•
Each
phase
is
adjusted
individually
.
-
I
Trip
the
breaker
open
and
check
to
see
that
dimension
d
_
is
4
+
1
/
8
inches
on
the
5
kv
,
and
6
+
1
/
8
inches
on
the
15
kv
on
all
three
phases
.
(
On
breakers
with
more
than
four
contacts
per
phase
,
dimension
d
^
is
still
measured
to
the
second
from
top
contact
.
)
J
Courtesy of NationalSwitchgear.com

PART
5
.
ARC
CHUTE
ASSEMBLY
ARC
CHUTE
ASSEMBLY
(
Fig
.
2
&
3
)
5.1
Each
arc
chute
consists
of
a
flame
retardent
envelope
which
provides
phase
isolation
for
interruption
and
venting
of
the
by
-
product
gases
of
interrupt
ion
.
The
arc
chute
contains
:
a
)
The
transfer
stack
consisting
of
refractory
plates
,
the
transfer
of
the
arc
terminal
from
the
stationary
end
arcing
contact
(
3
-
9
)
to
the
stationary
end
runner
(
2
-
4
)
.
It
aids
The
stationary
end
arc
runner
(
2
-
4
)
and
moving
end
arc
runner
(
2
-
3
)
to
which
the
arc
terminals
transfer
from
the
arcing
contacts
.
The
arc
runners
form
paths
for
the
arc
terminals
to
travel
up
the
arc
chute
.
b
)
c
)
The
stationary
end
blowout
coil
(
2
-
15
)
and
moving
end
blowout
coil
(
2
-
13
)
which
connect
their
respective
arc
runners
to
the
top
and
bottom
bushings
.
The
current
in
these
coils
creates
the
magnetic
flux
which
passes
through
cores
(
2
-
18
)
,
pole
pieces
(
2
-
22
)
and
the
space
between
the
pole
pieces
.
The
action
of
this
flux
on
the
arc
forces
the
arc
up
the
barrier
stack
.
The
barrier
stack
(
2
-
23
)
consisting
of
a
number
of
refractory
plates
with
"
Vee
Shaped
11
slots
cemented
together
.
The
barrier
stack
cools
,
squeezes
and
stretches
the
arc
to
force
a
quick
interruption
.
d
)
e
)
The
barrier
(
2
-
1
)
containing
coolers
(
2
-
28
)
through
which
the
by
-
product
gases
of
interruption
pass
.
The
barrier
completes
the
cooling
and
deionizing
of
the
arc
products
.
Arc
chutes
are
normally
tilted
(
see
Section
5
-
3
)
to
expose
contact
area
of
the
breaker
and
/
or
to
replace
parts
such
as
barrier
stacks
(
2
-
23
)
.
The
arc
chutes
may
also
be
removed
from
breaker
if
necessary
,
to
replace
parts
not
exposed
when
tilted
by
removing
fastenings
per
Section
5.3
.
5.2
PHASE
BARRIERS
(
Fig
.
1
)
Full
size
barriers
of
high
dielectric
flame
retardent
material
isolate
each
phase
.
To
remove
phase
barriers
on
5
kv
breakers
-
lift
panel
spring
assembly
(
1
-
13
)
out
of
slots
(
1
—
14
)
to
release
panel
(
1
-
32
)
.
Lift
and
remove
panel
.
Remove
center
phase
screw
(
1
-
23
)
.
The
phase
barrier
assemblies
(
1
-
5
)
and
(
1
-
7
)
can
now
be
lifted
and
removed
from
the
breaker
.
Note
:
On
MA
250
/
350
B
breakers
remove
screw
(
1
-
2
)
and
remove
barrier
(
1
-
25
)
prior
to
above
instructions
.
Courtesy of NationalSwitchgear.com

\
Adjustment
for
dimension
d
^
is
made
by
first
removing
pin
(
1
-
33
)
on
each
puffer
.
After
loosening
nut
(
1
-
42
)
,
increase
(
or
decrease
)
effective
length
of
rod
end
(
1
-
40
)
by
screwing
(
or
unscrewing
)
it
into
piston
stem
(
1
-
44
)
.
Adjust
rod
ends
(
1
-
40
)
on
both
puffers
the
same
amount
.
Tighten
nuts
(
1
-
42
)
,
replace
pin
(
1
-
33
)
,
and
check
dimension
d
^
.
\
*
)
*
i
Courtesy of NationalSwitchgear.com

To
remove
phase
barriers
on
15
kv
breakers
-
remove
screws
(
1
-
13
)
and
channels
(
l
-
'
J
)
on
rear
of
breaker
.
Lower
pane
!
(
1
-
32
)
and
loosen
three
screws
(
1
-
23
)
;
remove
three
screws
(
1
-
24
)
and
panel
(
1
-
22
)
on
front
of
breaker
.
The
phase
barrier
assemblies
(
1
-
5
)
can
now
be
removed
from
the
front
of
the
breaker
.
Replace
the
above
parts
in
reverse
order
taking
care
that
barriers
are
seated
properly
arid
that
channels
(
1
-
9
)
are
located
inside
of
washers
(
1
-
8
)
.
5
*
3
TILTING
ARC
CHUTES
Remove
phase
barriers
(
see
Section
5.2
)
.
On
the
5
kv
breakers
remove
screws
(
1
-
23
)
and
(
1
-
37
)
of
each
phase
.
Remove
screws
(
1
-
39
)
and
(
1
-
17
)
to
remove
barriers
(
1
-
19
)
and
(
1
-
22
)
.
On
the
15
kv
breakers
remove
screws
(
l
—
1
and
1
-
37
)
on
each
phase
.
Loosen
screws
(
1
-
23
)
and
remove
screws
(
1
-
24
)
and
(
1
-
39
)
to
remove
panel
(
1
-
22
)
.
With
arc
chute
support
in
place
,
at
the
rear
of
the
breaker
,
tilt
back
the
arc
chutes
.
After
tilting
arc
chutes
upright
,
and
replacing
barriers
,
be
sure
all
screws
are
tightened
securely
on
all
three
phases
.
5
,
4
BARRIER
STACKS
(
Fig
.
2
)
.
The
barrier
stacks
are
fragile
and
should
be
handled
carefully
.
The
barrier
stacks
should
be
inspected
for
erosion
of
the
plates
in
the
areas
of
the
slots
.
The
stacks
should
be
replaced
when
a
milky
glaze
is
observed
on
the
full
length
of
the
edges
of
most
of
the
slots
.
They
should
be
likewise
replaced
if
plates
are
broken
or
cracked
.
When
cleaning
the
breaker
and
cubicle
,
inspect
for
pieces
of
barrier
stack
refractory
material
which
would
obviously
indicate
breakage
.
To
remove
the
barrier
stacks
tilt
back
the
arc
chutes
(
see
Section
5
-
3
)
.
On
the
5
kv
breakers
remove
four
screws
(
2
-
2
)
,
(
five
screws
on
MA
-
250
B
)
,
barrier
(
2
-
1
)
,
from
each
arc
chute
.
Slide
barrier
stack
(
2
-
23
)
through
top
of
arc
chute
.
On
the
15
kv
breakers
remove
four
screws
(
1
-
26
)
,
two
barriers
(
2
-
1
)
and
if
applicable
,
two
screws
(
2
-
6
)
and
two
tubes
(
2
-
5
)
from
each
arc
chute
.
Slide
barrier
stack
(
2
-
23
)
through
top
of
arc
chute
.
When
sliding
a
barrier
stack
into
the
arc
chute
,
care
should
be
taken
to
see
that
the
end
containing
the
Vee
-
shaped
slots
goes
in
first
.
Courtesy of NationalSwitchgear.com

5
/
PHASE
BARRIER
ASSEMBLY
'
8
/
BARRIER
PANEL
\
SCREW
<
21
\
P
P
ARC CHUTE
BARRIER
STACK
O
o
n
•
o
!
l
POLE
PIECE
(
STEEL
CORE
)
i
i
WASHER
SCREW
>
PANEL
CHANNEL
CONTACT
FINGER
ASSEMBLY
(
PRIMARY
1
)
/
r
7
r
SCREW
8
>
NUT
CO
O
13
/
SCREW
CONNECTOR
I
SCREW
-
(
T
)
'
'
''
~
BARRIER
{
I
9
)
-
.
.
^
_
PIN
n
.
-
'
Or
:
.
INK
z
mi
SPRING
>
,
39
}
SCREW
r
4
/
SECONDARf
FINGER
ASSEMBLY
SCREW
3
PIN
m
NUT
PISTON
STEM
-
@
)
73
R
00
END
GUlOE
^
Ti
)
^
RELAY
-
\
21
SHUTTER
LANYARO
(
SPRING
RELEASE
)
TRIP
ROO
cn
AUXILIARY
SWITCH
-
(
l
5
n
FOOT
LEVER
[
INTERLOCK
RELEASE
)
3
l
>
OPENING
SPRINGS
FIG
.
I
TYPICAL MAGNETIC
BREAKER
PUFFER
'
>
@
-
pL
UNGER
GROUNOtNG
-
fi
?
"
LINGERS
STOP
<
3
Q
GUIOETII
JUNE
27
,
1966
71
*
401
*
531
*
401
Courtesy of NationalSwitchgear.com