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