GE AKR-30S User manual

GEH
-
5019
HH
Power
Circuit
Breakers
Installation
and
Maintenance
Instructions
Types
AKR
-
30
S
and
AKRU
-
30
S
<
GENERAL
®
ELECTRIC
Courtesy of NationalSwitchgear.com

CONTENTS
Description
Page
Description
Page
SECTION
6
—
Electrical
Replacement
Control
Components
.
17
SECTION
1
—
Receiving
,
Handling
,
and
Storage
3
Closing
Solenoid
..
.
.
Coil
Replacement
“
K
”
Relay
“
E
”
Relay
Replacement
.
.
.
Cut
-
off
Switch
17
17
SECTION
2
—
Installation
3
17
Location
Stationary
Breakers
(
Code
S
)
Draw
Out
Breakers
(
Code
D
)
.
Breaker
Insertion
Breaker
Removal
3
17
3
17
3
17
4
18
Replacement
Closing
Switch
.
.
Replacement
Shunt
Trip
Device
Replacement
Adjustment
.
.
4
18
18
SECTION
3
—
Operation
19
5
20
Electrical
Operation
.
.
.
Manual
Operation
Connections
Control
Connections
5
20
6
6
SECTION
7
—
Protective
Devices
Undervoltage
Device
Adjustment
Static
Time
-
Delay
Undervoltage
Electric
Lockout
Device
Bell
Alarm
Switch
and
/
or
Lockout
Attachments
.
Operation
Open
Fuse
Lockout
Device
(
OFLO
)
Operation
Adjustments
Replacement
Draw
Out
Interlocks
6
21
21
SECTION
4
—
Maintenance
21
8
22
Inspection
Separation
of
Front
and
Back
Frame
Lubrication
Troubleshooting
8
22
8
23
8
23
9
24
24
SECTION
5
—
Basic
Breaker
Components
.
24
10
24
Disconnects
Primary
Disconnects
Secondary
Disconnects
Replacement
of
Movable
Secondary
Disconnects
10
25
10
10
SECTION
8
—
MicroVersaTrip
®
Trip
Device
26
10
Programmer
Unit
.
.
..
Fault
Trip
Indicators
..
.
Remote
Fault
Indication
26
Arc
Quencher
Replacement
Breaker
Contact
Structure
Contact
Adjustments
Contact
Replacement
General
Preparation
Removal
of
Movable
Contacts
Removal
of
Stationary
Contacts
.
..
Replacement
of
Stationary
Contacts
Replacement
of
Movable
Contacts
.
Contact
Springs
Mechanism
Adjustment
Latch
Adjustment
Mechanism
Replacement
Removal
of
Front
Escutcheon
of
11
27
11
*
.
.
.
27
11
MicroVersaTrip
Installation
Current
Sensors
Replacement
Flux
Shift
Trip
Device
Troubleshooting
Resistance
Values
False
Tripping
—
Breakers
Equipped
with
Ground
Fault
28
11
28
12
28
12
28
12
29
12
29
12
14
30
14
14
SECTION
9
—
Electrical
Characteristics
15
16
35
16
SECTION
10
—
Renewal
Parts
Manual
Breakers
16
38
Auxiliary
Switch
.
,
Replacement
16
17
2
©
1984
General
Electric
Company
Courtesy of NationalSwitchgear.com

NOTE
:
Before
installing
or
operating
these
circuit
breakers
,
carefully
read
Sections
1
,
2
,
and
3
.
SECTION
1
—
Receiving
,
Handling
,
and
Storage
in
the
packaging
material
.
Blow
out
any
dirt
or
loose
particles
of
packaging
material
remaining
on
or
in
the
breaker
.
If
the
circuit
breaker
is
not
to
be
placed
in
service
at
once
,
store
it
in
a
clean
,
dry
location
in
an
upright
position
.
Support
it
to
prevent
bending
of
the
studs
or
damage
to
any
of
the
breaker
parts
.
Do
not
cover
the
breaker
with
packing
or
other
material
which
absorbs
moisture
that
may
cause
corrosion
of
breaker
parts
.
A
covering
of
kraft
or
other
non
-
absorbent
paper
will
prevent
dust
from
settling
on
the
breaker
.
Upon
receipt
of
a
circuit
breaker
,
immediately
examine
for
any
damage
or
loss
sustained
in
shipment
.
If
injury
,
loss
,
or
rough
handling
is
evident
,
file
a
damage
claim
at
once
with
the
transportation
company
and
notify
the
nearest
General
Electric
Sales
Office
.
Unpack
the
circuit
breaker
as
soon
as
possible
after
it
has
been
received
.
Exercise
care
in
unpacking
to
avoid
damage
to
the
breaker
parts
.
Be
sure
that
no
loose
parts
are
missing
or
left
SECTION
2
-
Installation
Location
The
outline
drawings
in
Table
1
provide
basic
dimensional
information
for
designing
the
panel
or
enclosure
mounting
.
In
choosing
a
location
for
the
installation
of
these
breakers
there
are
two
factors
to
be
considered
.
The
first
is
the
location
’
s
environmental
impact
on
the
breaker
.
Better
performance
and
longer
life
can
be
expected
if
the
area
is
clean
,
dry
,
dust
-
free
,
and
well
ventilated
.
The
second
is
convenience
for
operation
and
maintenance
.
The
breaker
should
be
easily
accessible
to
the
operator
and
there
should
be
sufficient
space
available
for
maintenance
work
.
Table
1
—
Outline
Drawings
Outline
Dwg
No
.
Breaker
Type
AKR
-
30
S
Draw
Out
AKRU
-
30
S
Draw
Out
AKR
-
30
S
Stationary
139
C
5317
139
C
5318
139
C
5319
Stationary
Breakers
(
Code
S
)
These
breakers
are
designed
for
mounting
in
a
switchboard
or
enclosure
designed
and
constructed
by
others
.
Mounting
consists
of
bolting
the
breaker
frame
to
a
supporting
structure
within
the
switchboard
or
enclosure
,
connecting
the
power
buses
or
cables
,
and
making
any
necessary
control
connections
.
The
front
cover
of
the
breaker
enclosure
may
be
a
hinged
door
or
a
plate
bolted
to
the
panel
,
including
a
cutout
opening
through
which
the
front
escutcheon
of
the
breaker
can
protrude
.
The
surface
on
which
the
breaker
is
mounted
must
be
flat
to
avoid
internal
distortion
of
the
breaker
.
The
supporting
structure
must
be
rigid
enough
to
avoid
any
possibility
of
the
breaker
studs
supporting
the
weight
of
the
breaker
.
Minimum
cutout
dimensions
as
given
by
the
appropriate
outline
drawing
must
be
maintained
to
provide
adequate
electrical
clearance
.
Connecting
bus
and
cables
must
be
rigidly
supported
to
prevent
undue
stress
on
the
breaker
terminals
.
Draw
Out
Breakers
—
Code
D
AKD
-
8
Switchgear
and
Substructure
The
draw
out
breaker
is
supported
by
two
protruding
pins
on
each
side
of
its
frame
;
these
pins
engage
slots
in
telescoping
slide
rails
(
tracks
)
mounted
to
each
sidewall
of
the
switchgear
.
All
draw
out
breakers
are
equipped
with
a
deep
escutcheon
with
side
labels
showing
these
discrete
positions
:
CONNECTED
—
This
is
the
breaker
’
s
“
in
-
service
”
position
.
It
is
fully
inserted
in
its
compartment
;
the
primary
and
secondary
disconnect
contacts
are
fully
engaged
.
The
breaker
must
be
tripped
before
it
can
be
racked
into
or
out
of
this
position
.
TEST
—
In
this
position
the
primary
contacts
are
disconnected
but
secondary
contacts
remain
engaged
.
This
allows
complete
breaker
operation
without
energizing
the
primary
circuit
.
i
3
Courtesy of NationalSwitchgear.com

Power
Circuit
Breakers
SECTION
2
—
Installation
DISCONNECTED
—
Both
primary
and
secondary
contacts
are
disengaged
.
WITHDRAWN
—
With
the
compartment
door
open
,
the
breaker
can
be
manually
pulled
out to
the
WITHDRAWN
position
.
At
this
point
the
tracks
are
fully
extended
and the
breaker
is
completely
out
of
its
compartment
,
ready
for
removal
.
Note
that
the
racking
mechanism is
not
employed
for
movement
of
the
breaker
between
the
DISCONNECTED
and
WITHDRAWN
positions
.
2
.
Using
the
lifting
wire
provided
,
raise
the
breaker
above
the elevation
of
the tracks
.
3
.
Slowly
lower
and
guide
the breaker
so
that the
breaker
mounting
pins
drop
into the slots
in
the
tracks
.
Remove
the
lifting
wire
.
4
.
Push
the
breaker
into the
compartment
until
it
reaches
the
stops
.
This
is
the
DISCONNECT
position
.
At
this
point
the
racking
arms
are
positioned
to
engage
the
fixed
racking
pins
in
the
compartment
,
ready
to
begin
the
racking
motion
.
5
.
Push
in
the inner
rails and close
the
compartment
door
.
Insert
the
racking
handle
into the
racking
screw
opening
in
the
compartment
door
.
By
clockwise rotation
of
the handle
,
move
the
breaker
through
the
TEST
position
into
the
CONNECTED
position
;
the
latter
is
indicated
when the
jackscrew
comes
to
a
solid
stop
.
Breaker
Insertion
1
.
Prior
to
lifting
a
breaker
to
its intended
compartment
location
,
observe
the
following
precautions
:
Breaker
Removal
1
.
With
the
door
closed
and
latched
,
trip
the
breaker
.
2
.
Insert the
racking
handle
and
rotate
it
counterclockwise
until the breaker
travels
from
CONNECTED
through
TEST
to
the
DISCONNECTED
position
,
as
indicated
by
the
jackscrew
coming
to
a
solid
stop
.
This
operation
should
be
performed
with
the door
closed
.
3
.
Open
the
compartment
door
and
pull
inner
rails
to
the
extended
position
.
Pull the
breaker
out to
the
travel
limit
—
this is
the
WITHDRAWN
position
.
4
.
Attach the
lifting
wire and
hoist the breaker
until
its
mounting
pins
clear the
track
slots
.
5
.
Swing
the
breaker
forward
until the
primary
disconnects
clear the
compartment
and lower
the
breaker
onto
a
flat
surface
free of
protrusions
that
could
damage
the breaker
’
s
internal
parts
.
PRECAUTIONS
a
.
Check
the
compartment
to
ensure
that
it
is
free
of
foreign
objects
.
b
.
Verify
that the breaker
is
the
correct
type
for
that
compartment
.
c
.
Ensure
that the
breaker
is
OPEN
.
d
.
Apply
a
thin
,
fresh
coat
of
D
50
HD
38
lubricant
to
the breaker
’
s
primary
disconnects
.
e
.
Ensure that the
racking
cams
on
the breaker
are
correctly
positioned
for
initial
engagement
with
the
pins
in
the
compartment
.
To do this
,
insert
the
racking
handle and
rotate
it
fully
counter
-
clockwise
.
4
Courtesy of NationalSwitchgear.com

Operation
SECTION
3
would
ensue
if
one
of
the
automatic
trip
devices
were
activated
at
the
time
of
closing
.
The
“
E
”
relay
,
together
with
the
cutoff
switch
,
provides
the
anti
-
pump
feature
.
The
mechanical
action
of
closing
operates
the
cutoff
switch
,
reversing
the
position
of
the
contacts
from
that
shown
on
the
diagram
.
This
energizes
the
“
E
”
relay
,
if
contact
is
still
maintained
at
the
closing
switch
,
with
the
result
that
the
“
K
”
relay
circuit
is
opened
by
“
E
”
contacts
5
-
6
.
This
prevents
the
“
K
”
relay
from
again
becoming
energized
.
“
E
”
contact
1
-
2
seals
in
the
“
E
”
coil
as
long
as
contact
is
maintained
at
the
closing
switch
.
Electrically
operated
breakers
may
also
be
closed
by
means
of
the
maintenance
handle
which
is
furnished
with
the
breaker
.
This
is
a
separate
tool
and
is
simply
a
lever
which
permits
an
operator
to
push
upwards
on
the
closing
solenoid
armature
.
Two
small
hooks
on
one
end
of
maintenance
handle
are
engaged
in
slots
(
12
)
,
Fig
.
7
,
located
in
the
lower
portion
of
the
front
escutcheon
(
10
)
.
Rotation
of
the
long
end
of
the
handle
downwards
forces
the
shorter
end
of
the
handle
upwards
against
the
bottom
of
the
solenoid
armature
,
and
closes
the
breaker
.
Electrical
Operation
(
See
Fig
.
1
)
The
electrically
operated
breaker
closes
whenever
the
closing
solenoid
coil
is
energized
.
This
causes
an
upward
movement
of
the
solenoid
armature
,
which
initiates
the
mechanical
closing
action
.
The
closing
signal
may
be
given
either
by
a
remote
switch
or
relay
,
or
by
a
closing
button
in
the
front
escutcheon
if
the
breaker
is
so
equipped
.
Either
action
(
refer
to
the
elementary
of
the
wiring
diagram
)
energizes
the
coil
of
the
“
K
”
relay
through
the
normally
closed
contacts
of
cutoff
switch
G
and
the
normally
closed
contacts
of
the
“
E
”
relay
.
When
the
“
K
”
relay
or
contactor
is
energized
,
it
closes
its
contacts
.
One
of
these
(
“
K
”
1
-
2
)
seals
in
the
“
K
”
coil
.
The
other
three
sets
of
contacts
,
which
are
arranged
in
series
,
activate
the
closing
solenoid
.
The
breaker
control
scheme
has
an
anti
-
pump
feature
which
allows
only
one
closure
of
the
breaker
for
a
single
operation
of
the
closing
switch
no
matter
how
long
the
switch
may
be
held
closed
.
This
prevents
the
repeated
operations
that
<
X
)
_
5
REMOTE
M
i
-
7
-
CLOSE
x
yt
\
A
2
^
A
3
A
(
+
)
FUSE
FUSE
STANDARD
LIST
OF
ABBREVIATIONS
(
SOME
DEVICES
MAY
NOT
BE
INCLUDED
IN
DIAGRAMS
)
TRIP
i
^
A
1
'
/
K
A
6
A
—
SECONDARY
DISCONNECT
LOCATED
TOP
LEFT
,
FRONT
VIEW
B
—
SECONDARY
DISCONNECT
LOCATED
TOP
CEN
-
TER
,
FRONT
VIEW
C
—
SECONDARY
DISCONNECT
LOCATED
TOP
RIGHT
,
FRONT
VIEW
D
-
CLOSING
SOLENOID
E
-
ANTI
-
PUMP
RELAY
G
—
CUT
-
OFF
SWITCH
K
—
CLOSING
RELAY
L
—
(
AUXILIARY
SWITCH
)
“
A
”
CONTACTS
TAKE
POSI
-
TION
OF
BREAKER
CONTACTS
,
“
B
”
CONTACTS
OPPOSITE
TO
BREAKER
CONTACTS
M
—
SHUNT
TRIP
DEVICE
P
—
PUSH
BUTTON
CLOSING
SWITCH
ON
BREAKER
1
4
=
£
P
2
1
<
1
L
K
•
2
T
AUX
.
SW
«
'
3
1
1
C
<
«
5
=
F
K
1
6
1
<
8
G
=
±
=
K
3
2
«
>
2
*
5
7
9
-
E
<
6
4
i
1
(
-
9
<
*
1
K
1
!
D
M
2
10
2
A
4
A
7
Y
A
5
a
i
$
FUSE
FUSE
(
Y
)
(
Y
)
(
Z
)
r
-
r
(
-
>
<
-
)
Fig
.
1
.
Typical
wiring
diagram
—
electric
operation
5
Courtesy of NationalSwitchgear.com

Power
Circuit
Breakers
SECTION
3
—
Operation
Connections
The
breaker
may
be
tripped
open
by
any
one
of
a
number
of
electrical
tripping
devices
which
will
be
described
in
detail
later
in
these
instructions
.
An
individual
breaker
may
have
none
or
any
combination
of
these
devices
.
They
are
the
overcurrent
tripping
device
,
shunt
tripping
device
,
undervoltage
tripping
device
,
and
open
fuse
lockout
device
.
All
of
them
affect
tripping
by
displacing
the
trip
latch
of
the
mechanism
.
The
trip
latch
is
rigidly
attached
to
a
trip
shaft
which
runs
through
the
breaker
from
left
to
right
.
Whenever
the
trip
shaft
is
rotated
in
a
counterclockwise
direction
looking
from
the
right
,
the
latch
is
displaced
.
The
tripping
devices
are
all
equipped
with
strikers
or
trip
arms
which
act
against
trip
paddles
rigidly
fastened
to
the
trip
shaft
,
causing
it
to
rotate
on
its
bearings
in
a
direction
to
trip
the
breaker
.
The
shunt
trip
device
has
a
set
of
of
auxiliary
switch
“
a
”
contacts
in
its
curcuit
.
(
An
“
a
”
contact
is
open
when
the
breaker
contacts
are
open
.
)
This
prevents
its
operation
unless
the
breaker
is
closed
.
The
undervoltage
device
coil
is
normally
continually
energized
.
When
the
control
voltage
is
low
or
non
-
existent
,
as
when
the
breaker
has
been
drawn
out
for
inspection
or
maintenance
,
the
breaker
is
rendered
trip
-
free
by
the
undervoltage
device
.
If
it
is
desired
to
close
the
breaker
,
the
device
armature
must
be
tied
down
or
blocked
closed
against
the
magnet
.
The
open
fuse
lockout
device
is
used
on
all
AKRU
(
fused
)
breakers
.
The
purpose
of
this
device
is
to
trip
the
breaker
upon
the
blowing
of
any
one
of
the
breaker
fuses
.
In
all
electrical
connections
,
good
joint
conductivity
is
a
must
.
When
making
power
connections
to
stationary
breakers
,
the
mating
joint
surfaces
must
be
clean
and
have
a
smooth
finish
.
They
should
be
parallel
and
firmly
bolted
or
clamped
together
.
In
addition
,
the
bus
or
cable
conductors
must
have
ample
ampacity
to
prevent
overheating
.
Control
Connections
The
equipment
connections
to
a
breaker
’
s
accessories
and
control
devices
must
be
in
accordance
with
the
specific
wiring
diagram
applicable
to
that
breaker
.
Control
connections
to
stationary
breakers
are
made
to
a
terminal
board
mounted
on
the
breaker
.
Figure
2
shows
typical
closing
and
tripping
connections
.
If
equipped
with
an
overcurrent
trip
device
which
includes
a
ground
fault
element
for
use
on
4
-
wire
circuits
,
an
additional
terminal
board
is
provided
on
the
breaker
for
connecting
to
the
equipment
-
mounted
neutral
sensor
(
physically
located
in
the
neutral
conductor
)
.
On
draw
out
breakers
the
control
circuits
terminate
in
the
breaker
compartment
on
the
stationary
portion
of
separable
secondary
disconnects
.
See
Fig
.
3
.
TERMINAL
BOARD
MOUNTED
ON
RIGHT
SIDE
OF
BREAKER
1
CUSTOMER
CONNECTIONS
Manual
Operation
The
manually
operated
breaker
is
closed
by
first
rotating
the
handle
in
a
counterclockwise
direction
through
90
degrees
,
then
rotating
it
clockwise
back
to
its
normal
vertical
position
.
The
counterclockwise
stroke
resets
the
mechanism
,
readying
it
for
the
clockwise
closing
stroke
.
The
breaker
may
be
tripped
manually
by
pushing
the
manual
trip
button
.
This
action
pushes
a
rod
against
a
trip
paddle
of
the
trip
shaft
,
rotating
it
,
and
causing
the
mechanism
trip
latch
to
be
displaced
.
This
allows
the
mechanism
linkage
to
collapse
through
the
action
of
the
mechanism
operating
springs
.
s
1
I
O
2
Os
CLOSE
O
3
X
>
O
4
cr
CLOSING
SOURCE
FUSE
O
5
O
TRIP
O
6
O
TRIP
SOURCE
O
7
O
CAUTION
:
IF
THE
BREAKER
IS
TRIPPED
MANUALLY
WHILE
THE
OPERATING
HANDLE
IS
IN
THE
RESET
POSITION
,
THE
HANDLE
SHOULD
BE
LOWERED
BY
THE
RIGHT
HAND
WHILE
OPERATING
THE
TRIP
BUTTON
WITH
THE
LEFT
HAND
.
O
8
O
UV
TRIP
SOURCE
O
9
O
O
1 0
O
Fig
.
2
.
Control
connections
to
stationary
breakers
—
front
view
6
Courtesy of NationalSwitchgear.com

Operation
SECTION
3
(
X
)
CO
CONTROL
SOURCE
TRIP
FUSE
SOURCE
a
—
i
H
(
Z
)
(
X
)
TRIP
CLOSE
r
CLOSE
SOLENOID
(
Y
)
SOURCE
H r
AAAAAAA
AAAAAAA
AAAAAAA
7
6
5
4
3
2 1
J l
7
6
5
4
3
2 1
7
6
5
4
3
2
1
C
A
B
STATIONARY SECONDARY
DISCONNECT
BLOCKS
LOCATED
AT
TOP
OF
COMPARTMENT
—
POSITIONS
B AND
C
FURNISHED
ONLY
WHEN
REQUIRED
Fig
.
3
.
Control
connections
to
draw
out
breakers
—
front
view
of
breaker
compartment
7
Courtesy of NationalSwitchgear.com

Power
Circuit
Breakers
SECTION
4
—
Maintenance
Inspection
1
.
Remove
the
arc
quenchers
(
see
“
Arc
Quenchers
,
”
Section
5
)
.
2
.
Disconnect
the
two
insulated
connecting
links
(
7
)
,
Fig
.
5
,
between
the
mechanism
and
the
crossbar
(
11
)
,
by
removing
the
tie
bolt
(
8
)
,
and
slipping
the
ends
of
the
links
off
the
ends
of
the
shouldered
pin
in
the
mechanism
.
Removal
of
the
two
top
flux
shifter
support
screws
will
permit
disengagement
of
the
reset
activator
.
CAUTION
:
BEFORE
INSPECTION
OR
ANY
MAINTENANCE
WORK
IS
DONE
,
BE
SURE
THAT
THE
BREAKER
IS
IN
THE
OPEN
POSITION
.
ALL
ELECTRICAL
POWER
,
BOTH
PRIMARY
AND
CONTROL
SOURCES
,
SHOULD
ALSO
BE
DISCONNECTED
.
3
.
If
the
breaker
is
a
draw
out
type
,
with
secondary
disconnects
,
remove
the
secondary
disconnect
supporting
bracket
from
the
breaker
back
frame
.
Also
remove
any
wiring
bundle
retainers
that
may
be
attached
to
the
back
frame
.
4
.
Remove
the
rear
elastic
stop
nut
from
each
of
two
studs
(
3
)
,
which
tie
the
upper
ends
of
the
mechanism
frame
to
the
back
frame
of
the
breaker
.
Remove
two
side
support
standoff
bolts
attached
to
back
frame
.
5
.
Remove
two
bolts
(
7
/
16
"
Hex
)
supporting
the
programmer
mounting
bracket
.
Disconnect
programmer
harness
at
current
sensor
terminal
boards
.
Note
polarity
and
tap
setting
(
where
applicable
)
.
6
.
Remove
the
two
elastic
stop
nuts
(
9
/
16
"
Hex
)
which
fasten
the
wraparound
portion
of
the
front
frame
to
the
back
frame
.
One
of
these
is
located
on
each
side
of
the
breaker
,
about
2
/
3
of
the
distance
down
from
the
top
edge
of
the
back
frame
.
7
.
The
two
frames
are
now
disconnected
.
Periodic
inspection
of
the
circuit
breaker
is
recommended
at
least
once
a
year
.
More
frequent
inspections
are
recom
-
mended
if
severe
load
conditions
,
dust
,
moisture
,
or
other
unfavorable
conditions
exist
.
If
the
breaker
remains
open
or
closed
for
a
long
period
of
time
,
it
is
recommended
that
arrangements
be
made
to
open
and
close
it
several
times
in
succession
,
preferably
under
load
.
At
all
times
it
is
important
not
to
permit
pencil
lines
,
paint
,
oil
or
other
foreign
materials
to
remain
on
the
insulating
surfaces
of
the
breaker
as
they
may
cause
low
resistance
between
points
of
different
potential
and
result
in
eventual
electrical
breakdown
.
Always
inspect
the
breaker
after
a
short
circuit
has
been
interrupted
.
At
the
time
of
periodic
inspection
,
the
following
checks
should
be
made
after
the
breaker
has
been
de
-
energized
.
1
.
Manually
operate
the
breaker
several
times
checking
for
obstructions
or
excessive
friction
.
2
.
Electrically
operate
the
breaker
several
times
(
if
breaker
has
electrical
control
)
to
ascertain
whether
the
electrical
attachments
are
functioning
properly
.
3
.
Remove
and
inspect
the
arc
quencher
.
Breakage
of
parts
or
extensive
burning
will
indicate
need
for
replacement
.
4
.
Check
contact
condition
and
depression
.
5
.
Check
latch
engagement
.
6
.
Check
operation
of
tripping
devices
,
including
overcurrent
trip
devices
,
making
sure
all
have
positive
tripping
action
(
discernible
movement
in
tripping
direction
beyond
point
of
tripping
)
.
(
For
detailed
information
on
breaker
features
listed
,
refer
to
appropriate
sections
of
these
instructions
.
)
CAUTION
:
CARE
SHOULD
BE
EXERCISED
IN
SEPARATING
THEM
TO
AVOID
DAMAGE
TO
THE
TRIP
SHAFT
ARMS
AND
PADDLES
.
While
the
back
frame
is
held
steady
,
lift
the
front
frame
and
mechanism
up
and
out
.
Reassembly
of
the
two
breaker
halves
is
accomplished
by
following
the
procedure
outlined
in
reverse
order
.
Lubrication
In
general
,
the
circuit
breaker
requires
very
little
lubrication
.
Bearing
points
and
sliding
surfaces
should
be
lubricated
very
lightly
at
the
regular
inspection
periods
with
a
thin
film
of
GE
lubricant
D
50
HD
38
(
Mobil
28
)
.
Hardened
grease
and
dirt
should
be
removed
from
latch
and
bearing
surfaces
by
the
use
of
a
safe
cleaning
solvent
such
as
kerosene
.
Latch
surfaces
should
be
left
clean
and
dry
and
not
be
lubricated
.
Separation
of
Front
and
Back
Frames
(
See
Fig
.
5
)
Many
maintenance
operations
will
either
require
or
be
greatly
facilitated
by
separating
the
front
frame
and
mechanism
of
the
breaker
from
the
back
frame
or
base
,
which
consists
of
the
current
carrying
parts
and
their
supporting
structure
.
The
procedure
for
this
operation
is
as
follows
:
NOTE
:
All
excess
lubricant
should
be
removed
with
a
clean
cloth
in
order
to
avoid
any
accumulation
of
dirt
or
dust
.
At
each
maintenance
period
,
all
silver
to
silver
friction
points
,
such
as
primary
disconnects
,
should
be
cleaned
and
given
a
fresh
coat
of
GE
lubricant
D
50
HD
38
.
8
Courtesy of NationalSwitchgear.com

Maintenance
SECTION
4
Troubleshooting
The
following
table
lists
several
possible
symptoms
of
breaker
malfunction
,
together
with
their
causes
and
remedies
.
If
,
at
any
time
,
these
symptoms
are
observed
,
their
cause
should
be
determined
and
the
necessary
corrective
action
should
be
taken
.
Remedy
Cause
Trouble
Adjust
contacts
.
Contacts
not
aligned
.
Overheating
Clean
contacts
.
Contacts
dirty
,
greasy
or
coated
with
dark
film
.
Replace
contacts
.
Contacts
badly
burned
or
pitted
.
Clean
surfaces
of
current
carrying
parts
.
Current
carrying
surfaces
dirty
.
Relocate
or
provide
adequate
enclosure
.
Replace
corroded
parts
.
Corrosive
atmosphere
.
Increase
capacity
of
bus
or
cable
.
Insufficient
bus
or
cable
capacity
.
Tighten
,
but
do
not
exceed
elastic
limit
of
bolts
or
fittings
.
Bolts
and
nuts
at
terminal
connections
not
tight
.
Check
breaker
application
or
modify
circuit
by
decreasing
load
.
Current
in
excess
of
breaker
rating
.
Provide
adequate
ventilation
.
Excessive
ambient
temperature
.
Re
-
adjust
or
replace
tripping
device
and
check
mechanism
latch
adjustment
.
Travel
of
tripping
device
does
not
provide
positive
release
of
tripping
latch
.
Failure
to
Trip
Replace
trip
unit
.
Worn
or
damaged
trip
unit
parts
.
Check
disconnect
plug
fit
and
terminals
.
Loose
or
disconnected
programmer
plug
.
Tighten
or
replace
harness
.
Loose
or
broken
current
sensor
harness
connections
.
Check
application
of
overcurrent
trip
device
.
False
Tripping
Overcurrent
trip
device
pick
-
up
too
low
.
Check
application
of
overcurrent
trip
device
.
Overcurrent
trip
device
time
setting
too
short
.
Re
-
adjust
clearances
and
check
latch
adjustment
.
Insufficient
clearance
to
trip
paddles
.
Tap
setting
on
current
sensors
incorrectly
set
.
Check
application
.
Check
polarity
and
connections
.
Check
continuity
of
conductors
connecting
the
neutral
sensor
.
External
ground
sensor
coil
improperly
connected
.
Failure
to
Close
and
Latch
Re
-
align
and
adjust
attachments
.
Binding
in
attachments
preventing
resetting
of
latch
.
Latch
out
of
adjustment
.
Adjust
latch
.
Latch
return
spring
too
weak
or
broken
.
Replace
spring
.
Clean
bearing
and
latch
surfaces
.
Hardened
or
gummy
lubricant
.
Replace
solenoid
coil
.
Re
-
adjust
or
replace
device
;
verify
minimum
closed
circuit
voltage
(
see
Table
5
)
.
Closing
solenoid
burned
out
.
Solenoid
control
device
not
functioning
properly
.
9
Courtesy of NationalSwitchgear.com

Power
Circuit
Breakers
SECTION
5
—
Basic Breaker
Components
Disconnects
purpose
enclosure
mounted
breakers
.
The
secondary
disconnects
allow
removal
of
the
breaker
without
the
necessity
of
having
to
detach
external
connections
.
The
movable
part
of
the
secondary
disconnect
consists
of
an
insulating
body
which holds
a
conducting
spring
loaded
plunger
to
which
a
flexible
lead
is
attached
.
As the
breaker
moves
into its
enclosure
,
the
plunger
is
depressed
by sliding
onto
the
stationary
disconnects
of
the enclosure
.
Primary
Disconnects
The
primary
disconnects
are
attached
to
the
ends
of
the
breaker
studs
on
the
rear
side
of
the breaker base
.
Each
disconnect
assembly
consists
of
two
pairs
of
opposed
contact
fingers
.
These
are
secured
to
the
breaker stud
by
a
bolt
which
passes
through
the
assembly
and
the
stud
.
When
engaged
with
the
stationary
stud
of
the
enclosure
,
the
disconnect
fingers
exert
a
set
amount
of
force
against
the
stationary
stud
through
the
action
of
the
compression
springs
.
Retainers
and
spacers
hold
the
contact
fingers
in
correct
alignment
for
engagement
with
the
stud
.
The
amount
of force
which the
fingers
exert
against
the
stud
is
determined
by
the
degree
to
which
the
springs
are
compressed
by
the
bolt
and
nut
which
hold
the
assembly
together
.
If
,
for
any
reason
,
the
disconnects
must
be
taken
apart
,
the
position
of
the
nut
on
the
bolt
should
be
carefully
noted
,
so
that
in
reassemblying
,
the
original
amount
of
compression
will
be restored
by replacing
the
nut at
its
former
position
on
the
bolt
.
The nominal
compressed
spring
height
is
25
/
32
inch
.
Replacement
of
Movable
Secondary
Disconnects
To
replace
movable
secondary
disconnects
,
proceed
as
follows
:
1
.
Unfasten
disconnect
body
from
breaker back
frame
.
2
.
Open
tabs
which hold
wires
on
inner
side
.
3
.
Pull
contact
tip
loose
from
hollow
tube
.
4
.
Remove
contact
tip
by
cutting
wire
at
its base
.
5
.
Push wire
through
hollow
tube
of
new
disconnect
assembly
.
6
.
Strip
insulation
off
end
of
wire
to
about
1
/
4
inch
from
end
.
7
.
Place
new
contact
tip
on
end
of
wire and
crimp
.
8
.
Pull wire
through
hollow tube until
contact
tip
fits
snugly
against
end
of
hollow
tube
.
Secondary
Disconnect
(
See
Fig
.
4
)
The
secondary
disconnects
serve
as
connections
between
breaker control
circuit
elements
and
external
control
circuits
.
They
are
used
only
on
draw
out
type
breakers
.
A
terminal board
serves
the
same
purpose
on
stationary
mounted
and
general
Fig
.
4
.
Movable
secondary
disconnects
10
Courtesy of NationalSwitchgear.com

SECTION
5
—
Basic
Breaker
Components
Breaker
Contact
Structure
9
.
Crimp
tab
on
other
side
of
assembly
to
hold
wire
in
place
.
10
.
Any
hollow
tubes
which
are
not
used
should
be
pushed
into
the
disconnect
body
and
held
in
that
position
by
placing
fibre
spacers
over
inner
ends
of
tubes
and
spreading
tabs
.
11
.
When
all
wires
have
been
connected
,
refasten
the
body
of
the
assembly
to
the
breaker
back
frame
.
The
copper
current
carrying
parts
of
the
breaker
are
all
mounted
on
a
common
base
of
insulating
material
made
of
polyester
glass
.
The
copper
of
each
pole
consists
of
an
upper
stud
and
pivot
,
stationary
contacts
,
two
movable
contact
arms
,
a
movable
contact
pivot
,
and
the
lower
stud
.
The
upper
stud
branches
into
two
pivot
surfaces
on
its
inner
end
on
the
forward
or
front
side
of
the
breaker
base
.
Each
of
these
convex
pivot
surfaces
mates
with
the
concave
pivot
surface
on
the
rear
side
of
the
stationary
contacts
.
Each
of
the
stationary
contacts
pivot
in
a
horizontal
plane
.
The
end
of
the
contact
opposite
to
the
contact
tip
end
is
formed
into
the
shape
of
a
small
hook
.
A
tension
spring
engages
this
hook
and
provides
the
necessary
contact
pressure
at
the
pivot
and
also
at
the
point
of
contact
with
the
movable
contact
arm
.
When
the
breaker
contacts
open
,
a
projection
on
the
contact
tip
end
of
the
stationary
contact
bears
against
a
stop
pin
restricting
the
movement
of
the
stationary
contact
.
This
arrangement
results
in
a
continual
high
force
existing
between
the
mating
pivot
surfaces
.
The
movable
contact
arms
pivot
in
a
vertical
plane
,
each
making
contact
with
three
stationary
contacts
,
and
thus
providing
six
low
-
resistance
parallel
paths
of
current
for
each
breaker
pole
.
The
movable
contacts
rotate
about
a
silver
-
plated
copper
pin
which
is
held
by
a
pivot
support
.
Each
side
of
the
pivot
support
bears
against
the
lower
,
outer
surface
of
the
contact
arm
and
supplies
a
second
low
-
resistance
path
through
the
pivot
.
U
-
shaped
spring
clips
made
of
silver
-
plated
conducting
material
provide
an
additional
current
path
and
protect
the
other
contact
surfaces
of
the
pivot
against
pitting
when
in
motion
.
These
clips
also
contribute
to
the
force
tending
to
increase
the
contact
pressure
between
the
lower
ends
of
the
movable
contacts
and
the
pivot
support
.
Arc
Quencher
The
arc
quencher
is
an
integral
riveted
assembly
composed
of
two
ceramic
side
plates
,
a
series
of
steel
plates
,
and
a
muffler
.
The
assembly
is
covered
by
a
wrap
-
around
of
insulating
material
which
inhibits
any
sidewise
emission
of
gases
.
The
side
barriers
on
the
arc
quencher
contain
flares
which
must
overlap
the
contact
barriers
.
The
steel
plates
are
held
in
position
and
supported
by
the
ceramic
sides
which
are
grooved
vertically
to
provide
recesses
for
the
vertical
edges
of
the
steel
plates
.
The
bottom
edges
of
the
latter
form
an
inverted
“
V
”
along
the
path
of
the
arc
that
may
be
drawn
between
the
breaker
contacts
during
interruption
.
The
steel
plates
have
the
effect
of
breaking
up
the
arc
,
and
cooling
it
and
the
gases
that
result
from
interruption
.
The
entire
assembly
provides
a
“
chimney
”
effect
which
directs
the
hot
,
ionized
gases
upwards
through
the
steel
plates
and
mufflers
and
allows
their
safe
and
controlled
escape
at
a
cooler
temperature
.
The
muffler
at
the
top
of
the
assembly
is
a
serpentine
shaped
strip
of
perforated
copper
-
plated
steel
.
It
is
important
that
the
perforations
of
the
muffler
be
kept
open
,
since
its
closure
could
tend
to
prevent
the
escape
of
the
gases
along
the
desired
path
.
CAUTION
:
AT
THE
REGULAR
MAINTENANCE
INSPECTION
,
CHECK
THE
CONDITION
OF
THE
MUFFLER
AND
OPEN
ANY
OF
THE
PERFORATIONS
THAT
APPEAR
TO
BE
CLOGGED
.
Contact
Adjustments
The
only
adjustment
to
be
made
on
the
breaker
contacts
is
that
of
contact
depression
.
This
is
the
distance
the
movable
and
stationary
contacts
move
while
they
are
touching
one
another
'
in
the
process
of
breaker
closing
.
The
amount
of
contact
depression
can
be
measured
by
comparing
the
position
of
the
front
surface
of
the
stationary
contact
when
the
breaker
is
open
to
its
position
when
the
breaker
is
closed
.
The
most
convenient
stationary
part
of
the
breaker
to
use
as
a
reference
point
is
the
steel
arc
runner
above
and
behind
the
stationary
contacts
.
The
proper
contact
depression
is
1
/
8
±
1
/
32
inch
measured
at
the
end
of
the
contact
tip
.
The
means
of
adjusting
contact
depression
is
provided
by
an
eccentric
pin
which
passes
through
the
center
of
the
movable
contact
assembly
.
Each
end
of
this
pin
has
a
free
,
projecting
,
hexagon
-
shaped
section
which
is
easily
accessible
to
a
small
,
open
-
end
,
1
/
4
-
inch
wrench
.
Two
cantilever
springs
,
which
bear
on
each
end
against
a
portion
of
the
hexagon
section
of
the
pin
,
If
any
very
extensive
burning
or
corrosion
is
noted
in
the
arc
quencher
,
it
should
be
replaced
.
Replacement
is
also
indicated
if
any
breaks
or
cracks
are
noted
in
the
ceramic
material
.
Replacement
To
remove
the
arc
quencher
,
lift
the
assembly
up
and
out
,
after
the
steel
retainer
across
the
front
of
the
arc
quenchers
has
been
removed
.
The
upper
edge
of
the
steel
arc
runner
,
fastened
to
the
back
plate
of
the
breaker
,
fits
into
a
recess
in
the
back
portion
of
the
arc
quencher
which
locates
it
in
its
proper
position
upon
replacement
.
Make
sure
the
steel
retainer
is
replaced
and
fastened
firmly
to
its
mounting
studs
after
the
arc
quenchers
have
been
replaced
.
Ensure
the
arc
quencher
is
fully
seated
on
the
arc
runner
prior
to
fastening
retainer
clamp
.
11
Courtesy of NationalSwitchgear.com

Power
Circuit
Breakers
SECTION
5
—
Basic
Breaker
Components
2
.
Lift
off
the
three
arc
quenchers
.
3
.
As
an
aid
to
future
reassembly
of
the
movable
contacts
,
note
the
position
of
all
stationary
insulation
barriers
with
respect
to
barriers
mounted
on
the
cross
bar
.
lock
the
adjusting
pin
in
place
and
provide
index
stops
for
the
process
of
adjustment
.
The
right
-
hand
hexagon
-
shaped
end
of
the
pin
is
numbered
from
1
to
6
,
which
provides
a
reference
for
making
depression
adjustments
.
When
contacts
are
to
be
adjusted
,
the
recommended
procedure
is
as
follows
:
1
.
When
the
breaker
is
in
the
open
position
and
using
the
numbers
on
the
right
end
of
each
adjusting
pin
as
reference
,
set
each
pin
in
the
same
position
.
In
many
cases
,
the
number
2
is
a
good
beginning
point
.
The
corresponding
pin
number
is
the
one
clearly
viewed
from
the
front
(
not
the
top
)
of
the
breaker
.
Note
that
the
numbers
on
the
pin
are
not
in
numerical
sequence
as
the
pin
is
rotated
.
2
.
By
measurement
,
establish
the
position
of
the
front
surfaces
of
the
stationary
contacts
with
reference
to
the
steel
arc
runners
above
and
behind
the
contacts
.
3
.
Close
the
breaker
and
establish
the
amount
of
depression
by
again
measuring
as
in
Step
2
and
comparing
the
measurements
with
those
taken
with
the
breaker
open
.
4
.
If
any
set
of
contacts
leads
or
lags
the
others
,
open
the
breaker
and
advance
or
retard
the
adjusting
pin
to
the
next
higher
or
lower
number
.
Moving
the
adjusting
pin
to
a
higher
number
will
increase
the
contact
depression
;
moving
to
a
lower
number
will
decrease
the
contact
depression
.
Removal
of
Movable
Contacts
(
2
)
,
Fig
.
6
or
(
21
)
,
Fig
.
5
1
.
Separate
the
front
and
back
frames
as
previously
outlined
in
Section
4
.
2
.
Remove
two
hole
plugs
(
3
)
,
Fig
.
6
,
from
barrier
(
2
)
,
Fig
.
5
.
Remove
the
U
-
shaped
insulation
barrier
(
6
)
from
each
pole
by
lifting
it
and
disengaging
the
rivet
heads
through
the
keyholed
slots
in
the
insulation
.
3
.
Thread
a
#
8
-
32
screw
lightly
into
pivot
pin
(
12
)
on
the
right
pole
.
4
.
With
a
pair
of
long
-
nosed
pliers
,
unhook
safety
-
pin
-
type
spring
clip
(
10
)
and
extract
pin
(
12
)
and
remove
spring
clip
(
10
)
.
5
.
Grasp
movable
contact
assembly
and
remove
it
from
its
seat
on
the
cross
bar
.
6
.
Repeat
procedures
1
,
2
,
and
3
on
the
left
pole
.
7
.
Move
the
cross
bar
downward
to
disengage
it
from
the
contact
wipe
adjusting
pin
(
18
)
on
the
center
pole
;
then
,
move
the
cross
bar
toward
the
front
of
the
breaker
.
8
.
Remove
the
split
pin
retaining
the
center
pole
pivot
pin
.
9
.
Remove
the
pivot
pin
and
movable
contact
assembly
.
NOTE
:
No
attempt
should
be
made
to
move
the
adjusting
pin
when
the
breaker
is
closed
.
Besides
the
fact
that
it
will
be
more
difficult
to
do
,
the
additional
force
required
to
move
the
pin
will
tend
to
round
off
the
flats
of
the
hex
section
of
the
pin
.
Removal
of
Stationary
Contacts
(
1
)
,
Fig
.
6
or
(
24
)
,
Fig
.
5
5
.
Be
sure
not
to
exceed
the
maximum
depression
recommended
.
If
higher
adjustment
numbers
are
used
,
it
is
possible
that
the
stationary
contacts
will
bottom
,
producing
excessive
back
force
on
the
breaker
closing
mechanism
so
that
the
toggle
link
(
4
)
,
Fig
.
7
,
will
not
pass
center
.
As
a
result
,
the
breaker
will
not
complete
its
stroke
and
inadequate
pressure
and
depression
will
result
,
followed
by
burn
-
up
of
contacts
from
load
current
.
1
.
Slip
the
blade
of
a
heavy
screw
driver
between
the
two
upper
contacts
(
1
)
,
Fig
.
6
,
and
force
the
contacts
toward
their
pivot
point
sufficiently
far
to
disengage
the
contact
stop
surface
from
the
pin
.
2
.
The
contact
can
then
be
removed
by
disengaging
the
end
of
the
contact
from
its
spring
(
22
)
,
Fig
.
5
.
3
.
The
lower
contacts
can
be
similarly
removed
.
Contact
Replacement
Under
normal
situations
,
the
replacement
of
all
the
movable
and
stationary
contacts
should
be
performed
at
the
same
time
.
This
will
be
the
case
where
long
use
of
the
breaker
in
service
has
resulted
in
extensive
wear
or
erosion
of
the
silver
alloy
contact
tips
.
Replacement
of
Stationary
Contacts
(
1
)
,
Fig
.
6
or
(
24
)
,
Fig
.
5
1
.
Coat
the
contact
pivot
area
only
of
each
of
the
six
contacts
(
1
)
,
Fig
.
6
,
with
a
thin
coat
of
D
50
HD
38
grease
.
2
.
Note
the
difference
between
the
three
types
of
stationary
contacts
and
be
sure
to
locate
them
in
the
breaker
with
the
upper
and
lower
contacts
having
their
stop
-
projecting
surfaces
as
shown
in
the
section
AA
,
Fig
.
5
.
The
upper
left
and
lower
right
contacts
are
identical
as
are
the
lower
left
and
upper
right
contacts
.
General
Preparation
1
.
Remove
arc
quencher
retainer
(
1
)
,
Fig
.
7
,
by
loosening
the
two
captured
nuts
with
a
7
/
16
-
inch
wrench
.
12
Courtesy of NationalSwitchgear.com

Basic
Breaker
Components
SECTION
5
Fig
.
5
.
Back
frame
/
contact
assembly
13
Courtesy of NationalSwitchgear.com

Power
Circuit
Breakers
SECTION
5
—
Basic
Breaker
Components
Use
a
bullet
-
nosed
5
/
16
-
inch
diameter
pin
to
aid
in
aligning
the
holes
in
the
cross
bar
,
the
contacts
and
the
pivot
supports
.
5
.
Install
the
left
and
right
pole
pivot
pins
(
12
)
,
Fig
.
5
,
while
threading
them
through
the
spring
clips
and
lock
the
spring
clips
(
10
)
.
Be
sure
the
pivot
pins
are
fully
inserted
.
Press
both
hole
plugs
(
3
)
,
Fig
.
6
,
back
into
barriers
(
4
)
.
Install
the
U
-
shaped
insulators
(
6
)
,
Fig
.
5
.
See
“
Contact
Adjustments
,
”
at
the
beginning
of
this
section
.
6
.
Reassemble
front
and
back
frames
in
reverse
order
of
disassembly
.
7
.
Adjust
the
contact
depression
.
If
the
moving
contacts
are
not
centered
when
closed
against
the
fixed
contacts
,
they
should
be
bent
laterally
.
8
.
Operate
the
breaker
manually
several
times
to
assure
proper
functioning
occurs
,
then
replace
the
arc
quenchers
.
When
replacing
the
arc
quenchers
be
sure
the
quencher
is
seated
downward
completely
and
that
the
quencher
clamp
covers
the
knobs
protruding
through
the
arc
quencher
insulation
.
3
.
By
placing
the
hook
on
the
end
of
the
contact
through
the
loop
of
the
contact
spring
,
the
contact
can
be
pushed
toward
the
pivot
surface
and
slipped
behind
the
stop
pin
.
Install
all
stationary
contacts
in
all
poles
.
Replacement
of
Movable
Contacts
(
2
)
,
Fig
.
6
or
(
21
)
,
Fig
.
5
1
.
Coat
the
pivot
area
only
of
the
new
movable
contacts
with
a
thin
coat
of
D
50
HD
38
grease
.
2
.
Assemble
the
center
pole
movable
contacts
,
align
the
pivot
pin
holes
,
and
install
the
pivot
pin
and
split
pin
.
3
.
Move
the
cross
bar
assembly
(
6
)
,
Fig
.
6
,
into
position
and
insert
the
eccentric
contact
wipe
adjustment
pin
(
18
)
,
Fig
.
5
,
on
the
center
pole
into
position
.
Be
sure
the
stationary
insulation
barriers
are
correctly
located
.
4
.
Align
the
cross
bar
with
the
left
and
right
pole
pivot
supports
(
16
)
and
install
the
left
and
right
pole
movable
contacts
.
Contact
Springs
(
22
)
,
Fig
.
5
A
minimum
force
of
7
lbs
and
a
maximum
force
of
8
lbs
should
be
required
to
begin
movement
of
a
single
stationary
contact
from
the
open
position
towards
the
closed
position
.
This
may
be
checked
by
using
a
push
scale
applied
at
the
center
of
the
contact
’
s
curved
surface
.
If
these
pressures
are
not
obtained
,
the
spring
anchor
tabs
may
require
bending
for
adjustment
.
If
the
spring
is
damaged
,
replacement
is
required
.
To
replace
or
adjust
the
contact
springs
,
the
upper
stud
(
20
)
Fig
.
5
,
must
be
removed
.
The
hardware
which
fastens
the
stud
to
the
breaker
base
consists
of
two
screws
(
19
)
and
nut
(
23
)
.
When
these
are
removed
,
the
stud
(
13
)
and
barrier
(
2
)
may
be
withdrawn
from
the
base
in
a
forward
direction
.
Contact
force
may
also
be
adjusted
without
removal
of
the
upper
stud
by
slightly
bending
the
stationary
hook
ends
(
Up
to
increase
force
;
Down
to
decrease
force
)
.
Mechanism
The
breaker
mechanism
is
a
spring
actuated
,
over
-
center
toggle
-
type
mechanism
.
As
the
closing
force
is
applied
,
either
by
movement
of
the
operating
handle
or
the
closing
solenoid
armature
,
energy
is
stored
in
the
operating
springs
.
After
the
springs
have
gone
over
center
,
movement
of
the
output
crank
of
the
mechanism
is
still
blocked
for
a
time
by
a
cam
arrangement
.
As
the
springs
are
further
extended
,
the
blocking
cam
moves
away
from
the
output
crank
and
the
springs
are
allowed
to
discharge
part
of
their
stored
energy
,
closing
the
breaker
contacts
.
ft
This
assures
a
fast
-
snapping
closing
action
regardless
of
the
speed
at
which
the
closing
handle
or
solenoid
is
operated
.
The
breaker
mechanism
is
tripped
by
the
displacement
of
the
trip
latch
(
7
)
,
Fig
.
8
.
Looking
at
the
breaker
from
the
right
-
Fig
.
6
.
Back
frame
—
location
of
crossbar
and
pole
shields
14
Courtesy of NationalSwitchgear.com

SECTION
5
—
Basic
Breaker
Components
i
1
u
0
o
B
8
B
EH
ED
EH
EH
1
.
Arc
quencher
retainer
2
.
Cut
-
Off
switch
3
.
Cut
-
Off
switch
actuator
4
.
Toggle
link
stop
5
.
Spring
carrier
6
.
Shoulder
pin
7
.
Connecting
link
8
.
Trip
latch
9
.
Trip
shaft
10
.
Front
escutcheon
(
Deep
escutcheon
removed
)
11
.
Closing
solenoid
12
.
Location
of
slots
for
maintenance
handle
13
.
Closing
solenoid
armature
1
.
Arc
quencher
muffler
2
.
Ceramic
side
plates
3
.
Arc chute barrier
4
.
Fixed
centers
in
mechanism
5
.
Latch
roller
6
.
Escutcheon
(
Deep
escutcheon
removed
)
7
.
Trip
latch
8
.
Handle
return
spring
Fig
.
7
.
Electric
mechanism
Fig
.
8
.
Manual
mechanism
hand
side
as
in
Fig
.
7
,
the
tripping
movement
of
the latch
is
counterclockwise
.
Operation
of
any
of
the
automatic
trip
devices
or
the
trip push
button
causes
the
latch
to
move
in
the
tripping
direction
.
When the latch
moves
off
the
trip
latch
roller
,
the
remaining
force
in
the
operating
spring
causes
the
mechanism
toggle
to
collapse
,
resulting
in
the
opening
of
the
breaker
contacts
.
Adjustment
If
the
breaker
mechanism
does
not
function
properly
,
it
is
best
to
first
perform
the
available
remedial
measures
listed
in
the
Troubleshooting
Chart
in
Section
4
.
One
of
the
remedies
listed is
that
of
proper
mechanism
latch
engagement
,
i
.
e
.
,
the
amount
of
engagement
between
the
latch
(
7
)
,
Fig
.
8
,
and
latch
15
Courtesy of NationalSwitchgear.com

Power
Circuit
Breakers
SECTION
5
—
Basic
Breaker
Components
5
.
Remove
four
screws
which
fasten
the
bottom
of
the
mechanism
frame
to
the
horizontal
cross
member
of
the
front
frame
.
roller
(
5
)
.
This
is
the
only
adjustment
that
is
required
on
the
breaker
mechanism
,
and
proper
latch
engagement
is
obtained
in
the
following
manner
:
6
.
If
the
breaker
is
manually
operated
and
has
no
auxiliary
switch
,
it
is
now
free
to
be
lifted
clear
of
the
breaker
.
If
it
has
an
auxiliary
switch
,
this
may
be
disconnected
from
the
mechanism
as
described
under
“
Auxiliary
Switch
—
Replacement
”
in
this
section
.
NOTE
:
Before
making
latch
adjustments
,
check
to
make
sure
that
the
buffer
paddle
which
stops
against
the
end
of
the
latch
adjustment
screw
is
rigidly
fastened
to
the
trip
shaft
.
Hold
the
trip
shaft
(
9
)
,
Fig
.
7
,
steady
and
attempt
to
move
the
buffer
paddle
.
If
any
relative
movement
between
the
two
is
noted
,
tighten
the
fasteners
holding
the
buffer
paddle
to
the
trip
shaft
.
Verify
that
no
trip
paddles
are
restricting
the
buffer
leaf
spring
’
s
shock
absorption
in
the
reset
position
.
7
.
If
the
breaker
is
electrically
operated
,
it
will
be
necessary
to
disconnect
the
mechanism
from
the
solenoid
armature
.
To
do
this
,
displace
the
trip
latch
and
raise
the
mechanism
as
far
as
the
travel
of
the
armature
will
permit
.
Remove
the
screw
which
holds
together
the
two
extensions
of
the
armature
.
After
this
is
removed
,
the
armature
extensions
must
be
spread
apart
to
release
them
from
the
link
connecting
with
the
mechanism
.
This
can
be
done
by
threading
a
#
10
-
32
screw
at
least
1
-
3
/
4
inches
long
into
the
top
hole
of
the
armature
extension
.
This
hole
is
just
above
the
one
from
which
the
binding
screw
has
been
removed
.
As
the
end
of
the
screw
butts
against
the
far
extension
,
the
two
extensions
will
be
spread
open
,
releasing
the
mechanism
link
.
8
.
The
replacement
mechanism
may
be
installed
by
reversing
the
disassembly
procedures
.
After
reassembly
,
check
the
operation
of
the
breaker
and
,
if
necessary
,
adjust
the
latch
engagement
.
Removal
of
Front
Escutcheon
of
Manual
Breakers
1
.
Loosen
the
set
screw
fastening
the
handle
to
the
operating
shaft
and
remove
.
2
.
Remove
the
retainer
and
two
flat
washers
from
the
shaft
.
3
.
Remove
four
screws
from
the
flange
of
the
escutcheon
.
If
the
breaker
is
a
draw
out
type
,
first
remove
the
deep
escutcheon
held
by
three
hex
screws
.
4
.
Push
steel
operating
shaft
through
escutcheon
bushing
.
5
.
Remove
handle
reset
spring
(
8
)
,
Fig
.
8
.
,
and
the
escutcheon
is
free
of
the
breaker
.
Auxiliary
Switch
The
auxiliary
switch
is
mounted
on
the
left
side
of
the
operating
mechanism
frame
.
Its
operating
shaft
is
linked
to
the
output
crank
of
the
breaker
mechanism
.
Through
a
cam
arrangement
,
the
operating
shaft
of
the
switch
controls
the
open
and
closed
positions
of
the
individual
contact
pairs
.
Each
stage
of
the
switch
,
which
is
usually
two
-
stage
or
five
-
stage
,
contains
one
“
a
”
and
one
“
b
”
set
of
contacts
.
An
“
a
”
pair
of
contacts
is
always
in
the
same
position
as
the
main
breaker
contacts
.
That
is
,
open
when
the
breaker
contacts
are
open
and
closed
when
the
breaker
contacts
are
closed
.
The
opposite
is
true
of
the
“
b
”
contacts
.
The
terminals
of
the
switch
are
covered
by
a
sheet
of
insulating
material
held
in
place
by
two
screws
fastened
along
its
left
edge
.
When
this
is
removed
,
the
terminals
are
exposed
.
The
upper
pairs
of
terminals
are
those
which
connect
to
“
a
”
switches
.
The
lower
terminals
connect
to
“
b
”
switches
.
Latch
Adjustment
1
.
Locate
the
latch
adjustment
screw
on
the
lower
,
outer
side
of
the
right
-
hand
mechanism
side
frame
.
This
screw
is
threaded
through
a
nylon
insert
locknut
which
,
in
turn
,
is
welded
to
a
projecting
bracket
on
the
mechanism
side
frame
.
2
.
Close
breaker
.
Turn
in
(
tighten
)
adjusting
screw
slowly
until
breaker
just
trips
.
NOTE
:
If
mechanism
will
not
close
breaker
,
withdraw
the
screw
approximately
two
turns
to
permit
closure
.
3
.
Withdraw
the
adjusting
screw
three
and
one
-
half
turns
from
the
position
noted
in
Step
2
.
This
sets
the
proper
amount
of
latch
engagement
.
Re
-
check
all
trip
paddle
clearances
.
4
.
Should
the
mechanism
continue
to
function
improperly
after
the
proper
latch
engagement
has
been
set
and
the
corrective
measures
listed
in
the
Troubleshooting
Chart
,
Section
4
,
carried
out
,
it
is
recommended
that
no
attempt
be
made
to
repair
the
mechanism
interior
but
that
a
replacement
mechanism
assembly
be
obtained
from
the
factory
.
Mechanism
Replacement
1
.
If
the
breaker
is
electrically
operated
,
remove
the
front
escutcheon
held
by
four
screws
.
If
the
breaker
is
a
draw
out
type
,
remove
the
deep
escutcheon
held
by
three
hex
screws
.
(
For
removal
of
front
escutcheon
from
manually
operated
breakers
,
see
the
following
procedure
.
)
2
.
Remove
arc
quenchers
(
see
“
Arc
Quencher
”
in
this
section
)
.
3
.
Disconnect
the
two
insulated
connecting
links
between
the
mechanism
and
the
contacts
as
in
Step
2
of
the
procedure
for
“
Separation
of
Front
and
Back
Frames
”
in
Section
4
.
4
.
Remove
the
two
elastic
stop
nuts
which
fasten
the
upper
extensions
of
mechanism
frame
to
studs
connecting
with
rear
frame
.
16
Courtesy of NationalSwitchgear.com

SECTION
5
—
Basic Breaker
Components
Replacement
NOTE
:
With
mechanism
in
the
CLOSED
position
,
slot
access
is
improved
.
1
.
Remove
auxiliary
switch
cover
.
2
.
Disconnect leads
to
switch terminals
.
3
.
Remove the
top
screw
which
fastens
switch
to
side
of
mechanism
frame
.
4
.
Remove switch
by
lifting
lower
bracket slot
out
of
mechanism
frame
tab
.
5
.
Before
mounting
replacement
switch
,
turn
the
crank
end
of
the switch
operating
shaft
in
position
to
engage
the
hole
in
the
link
connecting
with
the
breaker
mechanism
.
6
.
Complete
mounting by
following
disassembly
steps
in
reverse
order
.
SECTION
6
—
Electrical
Replacement
Control
Components
“
E
”
Relay
Closing
Solenoid
The
closing
solenoid
(
11
)
,
Fig
.
7
,
consists
of
a
magnet
,
armature
and coil
.
This
assembly
is
located
directly
beneath the
breaker
mechanism
to
which
it
is
connected
by
a
link
which ties
the
upper
end
of
the
armature to
the
spring
carrier
of
the
mechanism
.
As
described
under
“
Operation
,
”
Section
3
,
the
“
E
”
relay
is
a
permissive
relay
which
provides
anti
-
pump
protection
.
It
is
shock
-
mounted
to
the
arc
chute
retainer
clamp
.
Replacement
If
replacement
of
the
“
E
”
relay
becomes
necessary
,
it
may
be
detached
from
its
supporting
brackets
by
removal
of
the
fastening
hardware
.
The leads
to
the
relay
should
be
cut
off
as
closely
as
possible
to
the
soldered
connections
so
that
enough
wire
will
remain
for
connection
to
the
new
relay
.
After
replacement
has been
completed
,
the
relay
may
be
checked
electrically
in
the
following
manner
:
1
.
Apply
closing
voltage
to
terminal board
or
secondary
disconnnects
.
2
.
Push the
button
of
closing
switchand
hold
closed
.
3
.
Continue
to
hold the
push
button
in
the
“
closed
”
position
and
manually
trip
the breaker
open
.
4
.
If
the
breaker
stays
open
and
makes
no
attempts
to
close
,
the
“
E
”
relay
is
functioning
properly
.
5
.
While
releasing
the
close
button
,
observe
the
“
E
”
relay
.
It
should
open
as
the
closing
switch
is released
.
Coil
Replacement
1
.
Remove
escutcheon
by
unfastening
four flat
head
screws
in
flange
.
2
.
Remove
closing
switch
(
see
“
Closing
Switch
”
in
this
section
)
.
3
.
Cut off
or
disconnect the
coil
leads
.
4
.
Remove
four
screws
which
fasten
lower
section
of
magnet
to
upper
section
.
5
.
Disconnect
armature
from
mechanism
(
see
“
Mechanism
Replacement
,
”
Section
5
)
and
slide
assembly
down
.
6
.
Reassemble
with
new
coil
by
reversing
order
of
disassembly
.
“
K
”
Relay
The
“
K
”
relay
is
a
heavy
-
duty
relay
which
performs
the
function of
closing
the
circuit
of
the
breaker solenoid
during
electrical
operations
.
Three
of
the
four
sets
of
contacts
of
the
device
are
arranged
in
series
to
minimize
the
duty
required
of
any
one
contact
.
As
explained
under
“
Operation
,
”
Section
3
,
the
fourth
contact
is
used
to
“
seal
-
in
”
the
“
K
”
coil
.
The
“
K
”
relay
is
located
on
the
lower
right
behind the
programmer
.
To
replace
the
relay
,
remove
the
programmer
mounting
bracket
first
.
Disconnect
wires
(
noting
location
)
and
three
mounting
screws
.
Cutoff
Switch
(
Fig
.
9
)
As
explained
under
“
Operation
,
”
Section
3
,
the
function
of
the
cutoff
switch is
to
de
-
energize
the
“
K
”
contactor
coil
and
energize
the
“
E
”
relay
coil
as
the
breaker
mechanism
moves
from
the
opened
to
the
closed
position
.
The
switch is
operated
by
the
movement
of
a
mechanism
link
against
the switch
actuator
(
6
)
,
Fig
.
9
.
This
causes
the
17
Courtesy of NationalSwitchgear.com

Power
Circuit
Breakers
SECTION
6
—
Electrical
Replacement
Control
Components
mounting
screws
may
require
removal
to
gain
access
to
the
right
side
screw
.
4
.
Remove
the
front
escutcheon
from
the
breaker
.
5
.
Slide
the
cutoff
switch
out
from
between
the
steel
side
plates
by
pulling
straight
forward
.
6
.
Mount
the
replacement
switch
by
reversing
the
order
of
this
procedure
.
actuator
and
movable
contact
assembly
(
4
)
to
rotate
counter
-
clockwise
about
pin
(
7
)
,
opening
the
“
N
.
C
.
”
contacts
(
8
)
and
closing
the
“
N
.
O
.
”
contacts
(
9
)
.
Overtravel
of
the
actuator
(
6
)
beyond
the
point
of
making
contact
at
(
9
)
is
absorbed
by
spring
(
5
)
which
couples
the
movable
contact
(
4
)
to
the
actuator
.
Spring
(
3
)
resets
the
switch
after
the
breaker
contacts
open
and
the
breaker
mechanism
resets
.
The
point
at
which
the
cutoff
switch
operates
during
the
breaker
closing
cycle
is
after
the
spring
charged
mechanism
has
been
driven
“
over
-
center
.
”
This
assures
that
the
cutoff
switch
cannot
operate
too
early
in
the
breaker
closing
cycle
,
thus
the
“
K
”
and
“
E
”
relays
are
de
-
energized
and
energized
,
respectively
,
at
the
proper
time
and
the
circuit
’
s
anti
-
pump
feature
is
maintained
.
Closing
Switch
(
Fig
.
10
)
The
closing
switch
is
mounted
on
the
upper
flange
of
the
closing
solenoid
coil
.
A
hole
in
the
escutcheon
(
3
)
,
Fig
.
10
,
permits
access
to
the
switch
button
(
4
)
.
When
the
button
is
pressed
,
movable
contact
(
5
)
deflects
and
impinges
upon
stationary
contact
(
2
)
.
This
energizes
the
“
K
”
relay
coil
which
seals
itself
in
,
and
,
in
turn
,
energizes
the
closing
solenoid
.
Replacement
1
.
Remove
escutcheon
(
3
)
,
Fig
.
10
.
2
.
Disconnect
leads
from
switch
terminals
.
3
.
Deflect
the
left
end
of
hinge
(
7
)
to
the
left
so
that
the
movable
contact
(
5
)
may
be
disengaged
from
the
switch
assembly
.
4
.
Removal
of
the
two
screws
(
10
)
from
speed
nuts
(
9
)
completes
the
disassembly
of
the
switch
.
5
.
Reassembly
with
new
parts
is
a
matter
of
reversing
the
described
procedure
.
In
reassembling
,
be
sure
the
tab
on
the
left
end
of
hinge
(
7
)
is
bent
to
the
right
far
enough
to
avoid
any
possibility
that
movable
contact
(
5
)
might
become
free
of
the
assembly
.
Replacement
The
cutoff
switch
is
located
above
the
breaker
mechanism
.
It
is
fitted
between
the
upper
portions
of
the
steel
side
plates
that
make
up
the
mechanism
frame
.
A
raised
horizontal
ridge
on
each
side
of
the
molded
body
of
the
switch
fits
into
a
corresponding
groove
in
each
of
the
steel
side
plates
.
A
round
head
screw
on
each
side
fastens
the
switch
and
side
plate
together
.
Replacement
of
the
switch
is
accomplished
by
the
following
procedure
:
1
.
Remove
the
cover
on
the
top
of
the
switch
by
taking
out
the
two
screws
which
hold
it
in
place
.
2
.
After
taking
careful
note
of
the
connection
arrangements
,
disconnect
the
leads
from
the
switch
terminals
.
3
.
Remove
the
two
screws
,
one
on
each
side
,
which
fasten
the
switch
to
the
mechanism
side
plates
.
The
top
two
flux
shifter
Courtesy of NationalSwitchgear.com

SECTION
6
—
Electrical
Replacement
Control
Components
Shunt
Trip
Device
(
Fig
.
11
)
breaker mechanism
,
opening
the
breaker
contacts
.
The
trip
device
is
generally
activated
by
a
remote
switch
or
relay
which closes the shunt
trip
coil
circuit
.
To
avoid
unnecessary
heating
of
the coil
of
the
device
,
an
auxiliary
switch
“
a
”
contact
is
wired
in
series
with
the
coil
.
This
prevents
the
energization
of
the
coil
if
the breaker
is
open
.
The
shunt
trip
device
typically
is
mounted
underneath the
horizontal
cross
frame
member
,
just
to
the
left of
the
front
escutcheon
.
It
is
composed
of
a
magnet
(
7
)
,
Fig
.
11
,
coil
(
8
)
and
armature
(
10
)
.
The
armature
has
an
extended
arm
or
striker
(
11
)
which
bears
against
the
trip
paddle
(
12
)
on
the
trip
shaft
when
the
coil
(
8
)
is
energized
.
This
displaces
the
trip
latch
in
the
SCREW
(
10
)
(
1
)
INSULATION
(
2
)
STATIONARY
CONTACT
SPEED
NUT
(
9
)
/
i
(
3
)
FRONT
ESCUTCHEON
CLOSING
(
8
)
SOLENOID
m
HINGE
(
7
)
(
4
)
PUSH
BUTTON
\
i
\
Vh
= = =
'
/
\
(
5
)
MOVABLE
CONTACT
SPRING
(
6
)
Fig
.
10
.
Closing
switch
(
top
view
)
TRIP
SHAFT
(
14
)
CLAMP
MECHANISM
(
13
)
'
FRAME
TRIP PADDLE
(
12
)
ARMATURE
(
11
)
ARM
(
1
)
NUT
(
2
)
FRAME
Fr
~
3
i
(
3
)
SPRING
(
4
)
RIVET
-
fo
rr
ARMATURE
(
10
)
INSERT
SHIM
HERE
CLAMP
(
9
)
(
5
)
WEIGHT
(
6
)
SCREWS
COIL
(
8
)
(
7
)
MAGNET
Fig
.
11
.
Shunt
trip
device
19
Courtesy of NationalSwitchgear.com

Power
Circuit
Breakers
SECTION
6
—
Electrical
Replacement
Control
Components
Replacement
The
entire
shunt
trip
device
may
be
dismounted
by
disconnecting
the
coil
leads
and
removing
nuts
(
1
)
,
Fig
.
11
.
Adjustment
The
only
adjustment
required
on
the
shunt
trip
device
is
that
which
ensures
positively
that
the
breaker
will
trip
when
the
device
is
activated
.
To
be
sure
of
this
,
armature
arm
(
11
)
,
Fig
.
11
,
must
travel
from
1
/
32
to
1
/
16
inch
beyond
the
point
at
which
the
breaker
trips
.
A
good
method
of
checking
this
is
to
insert
a
1
/
32
-
inch
shim
between
the
magnet
(
7
)
and
armature
(
10
)
and
with
the
breaker
closed
,
push
down
on
the
arm
(
11
)
,
closing
the
armature
against
the
magnet
.
If
the
breaker
trips
,
there
is
sufficient
over
-
travel
.
If
adjustment
is
necessary
,
trip
paddle
(
12
)
,
Fig
.
11
,
may
be
formed
towards
or
away
from
the
armature
arm
(
11
)
.
Assure
a
minimum
clearance
of
1
/
16
inch
between
the
trip
paddle
and
breaker
frame
with
the
mechanism
in
the
RESET
position
.
Fig
.
12
.
Undervoltage
device
positive
trip
check
20
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