GE AM-13.8-750-4C User manual

INSTRUCTIONS
AND
RECOMMENDED
PARTS
FOR
MAINTENANCE
GEK
-
7322
A
MAGNE
-
BLAST
CIRCUIT
BREAKER
|
s
:
:
TYPES
i
i
I
If
AM
-
13.8
-
750
-
4
C
AM
-
13.8
-
750
-
4
CB
AM
-
13.8
-
750
-
4
H
AM
-
13.8
-
750
-
4
HB
t
1
%
fit
if
S
:
i
:
J
1
If
'
V
3
Introduction
«
•
•
•
•
•
•
•
•
*
•
••
•
•
::
Receiving
,
Handling
ahd
Storage
Installation
a
3
II
p
4
U
"
Description
of
Operation
Adjustments
.
.
,
General
Maintenance
.
.
14
Renewal
Parts
i
11
'
4
§
10
I
I
-
©
1
I
28
SI
•
•
•••
•
•
«
•
•
•
8
1
.
9
'
ft
I
1
I
POWER
SYSTEMS
MANAGEMENT
DEPARTMENT
I
»
o
I
GENERAL
m
yjW
'
j
ELECTRIC
I
I
PHILADELPHIA
,
PA
.
i
Courtesy of store.ips.us

:
i
Courtesy of store.ips.us

n
MAGNE
BLAST
CIRCUIT
BREAKER
AM
-
13.8
-
750
-
4
(
A
)
A
Letter
Designation
B
,
C
,
and
H
,
used
immediately
following
me
model
number
indicates
basic
design
features
.
INTRODUCTION
age
,
current
,
and
interrupting
ratings
are
never
exceeded
.
The
magneblast
breaker
is
the
removable
and
interchangeable
interrupting
element
used
in
metal
-
clad
switchgear
to
provide
reliable
control
and
pro
-
tection
of
electrical
apparatus
and
power
systems
.
The
AM
-
13.8
-
750
Magneblast
Breaker
is
avail
-
able
with
continuous
current
ratings
of
1200
amperes
-
and
2000
amperes
in
accordance
with
applicable
industry
standards
.
Refer
to
the
breaker
name
-
plate
for
complete
rating
information
of
any
par
-
ticular
breaker
.
The
nameplate
also
describes
the
control
power
requirements
for
that
breaker
.
The
application
of
a
breaker
must
be
such
that
its
volt
-
Since
this
.
book
is
written
to
include
all
ratings
of
the
breaker
as
well
as
several
de
-
sign
variations
,
the
instructions
will
be
of
a
general
character
and
all
illustrations
will
be
typical
unless
otherwise
specified
.
PROPER
INSTALLATION
AND
MAINTENANCE
ARE
NECESSARY
TO
INSURE
CONTINUED
SAT
-
ISFACTORY
OPERATION
OF
THE
BREAKER
.
The
following
instructions
will
provide
complete
infor
-
mation
for
placing
magne
-
blast
breakers
in
service
and
for
maintaining
satisfactory
operation
.
RECEIVING
,
HANDLING
AND
STORAGE
Receiving
and
Handling
Each
breaker
is
carefully
inspected
and
packed
for
shipment
.
Immediately
upon
receipt
of
the
circuit
breaker
,
an
examination
should
be
made
for
any
damage
sustained
in
transit
.
If
injury
or
rough
handling
is
evident
,
a
damage
claim
should
be
filed
immediately
with
the
transportation
com
-
pany
and
the
nearest
General
Electric
Sales
Office
should
be
notified
.
It
is
expected
that
due
care
will
be
exercised
during
the
unpacking
and
installation
of
the
breaker
so
that
no
damage
will
occur
from
careless
or
rough
handling
,
or
from
exposure
to
moisture
or
dirt
.
Check
all
parts
against
the
packing
list
to
be
sure
that
no
parts
have
been
overlooked
.
Shipping
Blocks
(
where
applicable
)
To
protect
the
box
barrier
and
Interrupter
assemblies
during
shipment
,
special
blocks
installed
at
the
factory
between
the
bottom
of
the
interrupter
and
the
box
barrier
.
When
the
box
barrier
is
removed
for
installation
inspection
,
these
shipping
blocks
should
be
removed
and
discard
-
storage
It
is
recommended
that
the
breaker
be
put
into
service
immediately
in
its
permanent
location
.
If
this
is
not
possible
,
the
following
precautions
must
be
taken
to
insure
the
proper
storage
of
the
breaker
:
1
.
The
breaker
should
be
carefully
protected
against
condensation
,
preferably
by
storing
it
in
a
warm
dry
room
,
since
water
absorp
-
tion
has
an
adverse
effect
on
the
in
-
sulation
parts
.
Circuit
breakers
for
out
-
door
metal
-
clad
switchgear
should
be
stored
in
the
equipment
only
when
power
is
avail
-
able
and
the
heaters
are
in
operation
to
prevent
condensation
.
2
.
The
breaker
should
be
stored
in
a
clean
location
,
free
from
corrosive
gases
or
fumes
;
particular
care
should
be
taken
to
protect
the
equipment
from
moisture
and
cement
dust
,
as
this
combination
has
a
very
corrosive
effect
on
many
parts
.
3
.
Unfinished
surfaces
of
rollers
,
latches
etc
.
,
of
the
operating
mechanism
should
be
coated
with
grease
to
prevent
rusting
.
;
i
l
are
ed
.
Cover
Photo
(
8034803
)
These
instructions
do
not
purport
to
cover
all
details
or
variations
in
equipment
nor
to
provide
for
every
possible
contingency
to
be
met
in
connection
with
installation
,
operation
or
maintenance
.
further
information
be
desired
or
should
particular
problems
arise
which
are
not
covered
sufficiently
for
the
purchaser
'
s
purposes
,
the
matter
should
be
referred
to
the
General
Electric
Company
.
Should
IEEE
and
NEMA
standards
;
but
no
such
assurance
is
given
with
respect
to
local
codes
and
ordinances
because
they
vary
greatly
.
To
the
extent
required
the
products
described
herein
meet
applicable
ANSI
,
3
Courtesy of store.ips.us

GEK
-
7322
Magne
Blast
Circuit
Breaker
leal
condition
.
Should
the
breaker
be
stored
under
unfavorable
atmospheric
conditions
,
it
should
be
cleaned
and
dried
out
before
being
placed
in
service
.
If
the
breaker
is
stored
for
any
length
of
time
,
it
should
be
inspected
periodically
to
see
that
rusting
has
not
started
and
to
insure
good
mechan
-
INSTALLATION
1
.
Remove
the
box
barrier
and
mechanism
cover
and
make
a
visual
inspection
to
as
-
certain
that
the
breaker
and
mechanism
is
in
satisfactory
condition
.
Check
all
bearing
surfaces
of
the
mechanism
for
lubrication
.
Refer
to
section
on
lubrication
page
IQ
and
Figure
17
.
2
.
Charge
the
breaker
closing
springs
man
-
ually
using
a
5
/
8
"
ratchet
wrench
to
turn
the
driving
eccentric
(
6
)
Figure
1
.
Turning
the
eccentric
counter
clockwise
will
advance
the
ratchet
wheel
and
compress
the
springs
.
When
the
springs
have
reached
the
fully
charged
position
the
indicator
(
1
)
will
read
"
CHARGED
"
,
and
the
driving
pawl
will
be
raised
from
the
ratchet
wheel
teeth
.
Ad
-
ditional
turning
of
the
eccentric
will
not
advance
the
ratchet
wheel
.
Insert
the
spring
blocking
device
(
10
)
and
manually
discharge
the
springs
against
the
pins
by
pushing
the
manual
release
button
(
4
)
.
The
springs
are
now
blocked
and
slow
closing
of
the
breaker
contacts
can
be
accomplished
by
again
turning
the
driving
eccentric
with
a
5
/
8
"
ratchet
wrench
.
During
the
slow
closing
operation
check
to
insure
that
the
mechanism
does
not
stick
or
bind
during
the
entire
stroke
,
that
it
latches
securely
in
the
closed
position
,
and
that
it
trips
freely
when
the
manual
trip
lever
is
operated
.
At
this
time
,
also
check
the
following
adjustments
:
a
.
Arcing
contact
wipe
(
Refer
to
page
10
)
b
.
Primary
contact
wipe
(
Refer
to
page
11
)
c
.
Primary
contact
gap
(
Refer
to
page
11
)
DO
NOT
WORK
ON
EITHER
THE
BREAKER
OR
MECHANISM
UNLESS
THE
CLOSING
SPRINGS
ARE
BLOCKED
AND
THE
OPEN
-
ING
SPRINGS
HAVE
BEEN
TRIPPED
OPEN
THIS
OR
MECHANICALLY
BLOCKED
.
PRECAUTION
IS
REQUIRED
TO
PREVENT
ACCIDENTAL
CLOSING
OR
TRIPPING
.
The
closing
springs
should
now
be
un
-
blocked
.
Rotate
the
driving
eccentric
until
the
indicator
reads
"
CHARGED
”
and
the
ratchet
wheel
does
not
adyance
.
The
spring
blocking
device
can
now
be
removed
.
3
.
Connect
the
test
coupler
to
the
circuit
breaker
and
operate
it
electrically
several
times
.
Check
the
control
voltage
as
de
-
scribed
under
"
CONTROL
POWER
CHECK
"
(
Page
14
)
.
4
.
Disconnect
the
test
coupler
and
replace
box
barrier
.
5
.
If
the
breaker
has
been
stored
for
a
long
period
of
time
,
it
is
recommended
that
the
insulation
be
checked
with
a
standard
60
hertz
high
potential
test
.
Refer
to
Insulation
Test
(
Page
16
)
.
NOTE
:
If
the
breaker
secondary
wiring
is
to
be
given
a
hi
-
potential
test
at
1500
volts
,
remove
both
the
motor
leads
from
the
terminal
connection
.
Failure
to
dis
-
connect
the
motor
from
the
circuit
may
cause
damage
to
the
winding
insulation
.
6
.
Lubricate
the
silver
portion
of
the
ball
contact
at
the
top
of
the
breaker
bushing
by
applying
a
thin
film
of
contact
lubricant
D
50
H
47
.
7
.
Refer
to
metal
-
clad
instruction
book
GEH
-
1802
for
instruction
on
inserting
the
break
-
er
into
the
metal
-
clad
unit
.
DESCRIPTION
OF
OPERATION
The
Magneblast
Breaker
has
two
principal
com
-
ponents
;
the
breaker
element
and
the
operating
mechanism
:
The
breaker
element
is
three
similar
pole
units
,
each
of
which
includes
the
current
carrying
parts
,
main
and
arcing
contacts
,
interrupter
,
and
an
enclosing
barrier
system
that
provides
insulation
between
poles
,
or
phases
and
to
ground
.
The
pri
-
mary
connections
to
the
associated
metal
-
clad
switchgear
are
made
through
the
ball
contacts
at
the
top
of
the
breaker
bushings
.
The
operating
mechanism
type
ML
-
13
is
of
the
stored
energy
type
designed
to
give
high
speed
closing
and
opening
.
The
mechanism
will
operate
on
a
-
c
or
d
-
c
voltage
as
indicated
on
the
breaker
nameplate
.
Closing
and
opening
operations
are
controlled
either
electrically
from
the
metal
-
clad
unit
and
remote
location
,
or
mechanically
by
the
manual
close
and
trip
levers
on
the
breaker
.
All
secondary
connections
from
the
breaker
to
the
metal
clad
unit
are
made
through
the
coupler
(
1
)
Fig
.
2
.
A
spring
release
interlock
,
Fig
.
3
,
is
provided
to
discharge
both
the
closing
and
opening
springs
when
the
breaker
is
withdrawn
from
or
inserted
into
the
Metal
Clad
unit
.
P
4
Courtesy of store.ips.us

1
.
(
8034475
)
Spring
Blocking
Device
Charge
-
Discharge
Indicator
Support
Bolts
Driving
Pawl
Manual
Close
Lever
Motor
Eccentric
Closing
Spring
Manual
Charging
Wrench
Fuse
Spring
Blocking
Device
I
1
m
Figure
2
.
(
8034473
)
Left
Side
View
ML
-
13
Operating
Mechanism
l
il
O
1
.
Secondary
Coupler
2
.
Interlock
Switches
3
.
Auxiliary
Switch
4
.
Latch
Checking
Switch
5
.
Switch
Cam
6
.
Charge
-
Discharge
Indicator
7
.
Closing
Latch
Roller
8
.
Power
Switches
9
.
Closing
Latch
10
.
Closing
Springs
11
.
Motor
12
.
Fuses
2
j
?
3
:
4
HI
5
9
A
mm
’
6
IRfiljiig
I
ftr
.
i
K
Figure
3
.
(
8038805
)
Spring
Discharge
Linkage
1
.
Link
2
.
Adjusting
Bolt
3
.
Trip
Latch
Crank
Discharge
Crank
Adjusting
Clevis
Spring
Release
Crank
4
.
5
.
6
.
5
Courtesy of store.ips.us

GEK
-
7322
Magne
Blast
Circuit
Breaker
A
positive
interlock
(
3
)
Figure
4
and
interlock
switch
(
2
)
Figure
2
,
are
provided
between
the
breaker
and
metal
-
clad
unit
to
prevent
raising
or
lowering
of
the
breaker
in
the
unit
while
in
a
closed
position
and
to
prevent
a
closing
operation
when
the
breaker
is
not
in
either
the
fully
raised
or
lowered
position
.
To
insure
that
this
interlock
will
function
during
manual
,
as
well
as
during
electrical
operation
of
the
equipment
,
both
mechan
-
ical
and
electrical
blocking
is
provided
.
If
for
any
reason
the
closing
springs
should
be
dis
-
charged
against
the
positive
interlock
the
mechan
-
ism
will
be
jammed
and
be
inoperable
.
The
mechanism
can
be
released
and
returned
to
the
reset
position
by
pushing
in
on
the
trip
lever
(
8
)
Figure
5
.
It
may
require
more
than
normal
force
to
release
the
interlock
.
A
plunger
interlock
,
Figure
14
can
be
provided
when
required
to
operate
a
stationary
auxiliary
Switch
and
/
or
a
rod
interlock
mounted
in
the
metal
clad
unit
.
When
the
breaker
is
used
interchangeably
with
type
MS
-
13
solenoid
operated
breakers
in
M
-
36
metal
-
clad
units
,
fuses
(
12
)
Figure
2
,
are
mounted
on
the
breaker
for
protection
of
the
motor
and
closing
circuit
.
These
breakers
are
identified
by
"
C
"
suffix
in
the
breaker
nomenclature
.
In
cases
where
breakers
with
type
ML
-
13
mechanisms
must
match
and
line
up
with
breakers
having
type
ML
-
11
mechanisms
the
spring
charging
circuit
for
both
mechanisms
should
be
fused
with
Buss
Company
Fusetrons
as
follows
:
:
Cont
.
Volt
.
Fuse
Size
Cat
.
No
.
48
v
d
-
c
llOv
d
-
c
125
v
d
-
c
.
.
115
v
a
-
c
220
v
d
-
c
250
v
d
-
c
230
v
a
-
c
FEN
10
FEN
k
FRN
h
FEN
4
FEN
e
.
5
FEN
2.5
FEN
2.5
10
A
4
A
4
A
kA
2.5
A
2.5
A
2.5
A
Spring
Charging
The
mechanism
has
a
high
speed
gear
motor
(
10
)
Figure
5
,
that
compresses
a
set
of
closing
springs
through
the
action
of
an
eccentric
,
ratchet
,
and
pawl
assembly
.
The
rotary
action
of
the
motor
is
converted
to
a
straight
stroke
through
the
eccerf
-
tric
(
11
)
Figure
4
,
and
a
lever
that
carries
a
spring
loaded
driving
pawl
(
3
)
Figure
1
.
Figure
4
.
(
8038804
)
Right
Side
View
ML
-
13
Operating
Mechanism
Figure
5
.
(
8038803
)
Front
View
ML
-
13
Operating
Mechanism
1
.
Upper
Spring
Pin
Latching
Pawls
Positive
Interlock
Roller
Opening
Spring
Cam
Shaft
Ratchet
Wheel
Bearing
Block
Driving
Pawl
Lower
Spring
Pin
Driving
Pawl
Lever
Eccentric
Closing
Spring
2
.
1
.
Auxiliary
Switch
2
.
Open
-
Close
Indicator
3
.
Trip
Coil
4
.
Prop
Spring
5
.
Operation
Counter
6
.
Trip
Latch
7
.
Charge
-
Discharge
Indicator
8
.
Manual
Trip
Lever
9
.
Manual
Close
Lever
10
.
Motor
3
.
4
.
5
.
6
.
7
.
8
.
9
.
10
.
11
.
12
.
!
:
6
Courtesy of store.ips.us

m
Magne
Blast
Circuit
Breaker
GEK
-
7322
and
the
driving
pawl
is
raised
from
tharatchet
wheel
.
The
use
of
the
ratchet
wrench
provides
for
maxi
-
mum
safety
in
the
event
that
control
power
is
suddenly
restored
without
warning
.
In
this
event
,
the
motor
drive
will
override
the
ratchet
wrench
and
continues
to
charge
the
springs
.
The
pawl
advances
the
ratchet
wheel
(
6
)
Figure
4
a
few
degrees
each
stroke
where
it
is
held
in
pos
-
ition
by
the
latching
pawls
(
2
)
.
When
the
ratchet
wheel
,
has
been
rotated
approximately
180
degrees
the
closing
springs
(
12
)
will
be
fully
compressed
.
As
the
ratchet
wheel
continues
to
rotate
,
the
spring
load
will
shift
over
center
and
attempt
to
discharge
.
After
a
few
degrees
of
rotation
,
the
closing
roller
(
7
)
Figure
2
,
will
engage
the
closing
latch
(
9
)
and
the
compressed
springs
will
be
held
by
the
latch
until
a
closing
operation
is
required
.
During
the
last
few
degrees
of
the
ratchet
wheel
rotation
the
power
switches
(
8
)
are
opened
and
the
driving
pawl
is
raised
from
the
ratchet
wheel
surface
.
This
allows
the
motor
and
driving
mechanism
to
coast
to
a
natural
stop
expending
all
residual
energy
.
During
the
time
the
springs
are
being
com
-
pressed
a
relay
(
17
)
Figure
6
,
is
energized
to
hold
the
closing
circuit
open
.
The
relay
remains
energized
until
the
springs
are
fully
charged
and
the
control
switch
contacts
are
re
-
set
.
The
closing
springs
may
be
charged
manually
if
control
voltage
is
lost
.
A
5
/
8
"
ratchet
wrench
can
be
used
to
rotate
the
eccentric
in
a
counter
clock
-
wise
direction
until
the
indicator
reads
"
Charged
"
Closing
Operation
The
breaker
can
be
closed
electrically
by
energizing
the
spring
release
solenoid
(
15
)
Figure
6
,
or
manually
by
pushing
the
close
button
(
9
)
Figure
5
.
In
either
method
the
closing
latch
is
rotated
from
under
the
closing
roller
to
release
the
closing
springs
(
10
)
Figure
2
.
The
energy
in
the
springs
is
used
to
rotate
a
cam
(
16
)
Figure
7
and
close
the
breaker
through
the
operating
mechanism
linkage
.
During
the
closing
operation
the
mechanism
is
trip
-
free
at
all
times
.
The
break
-
er
is
held
closed
by
the
closing
prop
(
14
)
moving
into
position
under
the
prop
pin
(
13
)
.
During
the
closing
operation
the
opening
springs
(
4
)
Figure
4
,
are
compressed
and
held
ready
for
an
opening
operation
with
the
trip
latch
(
8
)
Figure
7
bearing
against
the
trip
latch
roller
(
9
)
.
When
the
closing
operation
of
the
breaker
is
completed
and
the
closing
latch
is
fully
reset
,
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Fig
.
6
(
8034467
)
Control
Mechanism
7
.
Power
Switches
8
.
Closing
Latch
9
.
Closing
Latch
Shaft
10
.
Latch
Adjusting
Screw
11
.
Release
Coil
Bolts
12
.
'
Closing
Latch
Spring
13
.
Latch
Monitoring
Switch
14
.
Switch
Mounting
Bracket
15
.
Spring
Release
Solenoid
16
.
Release
Coil
Support
17
.
Control
?
Relay
1
.
Latch
Checking
Switch
2
.
Switch
Cam
3
.
Switch
Striker
4
.
Switch
Support
Bolts
5
.
Switch
Support
6
.
Closing
Latch
Roller
7
Courtesy of store.ips.us

GEK
-
7322
Magne
Blast
Circuit
Breaker
by
energizing
the
trip
coil
(
3
)
Figure
5
,
or
manually
by
pushing
the
trip
lever
(
8
)
.
In
each
method
the
trip
latch
is
rotated
off
the
trip
latch
roller
,
per
-
^
mitting
the
operating
mechanism
linkage
to
collapse
.
The
energy
stored
in
the
opening
springs
is
released
to
provide
the
required
opening
speed
for
successful
interruption
of
the
circuit
.
the
contacts
of
the
latch
monitoring
switch
closes
to
permit
the
spring
charging
motor
to
be
ener
-
gized
and
recharge
the
closing
springs
.
Opening
Operation
The
breaker
can
be
opened
either
electrically
13
14
15
25
-
16
Fig
.
7
(
0114
C
5320
)
Sectional
Side
View
of
Mechanism
1
.
Handle
Trip
Coil
Support
Trip
Coil
Trip
Armature
Prop
Reset
Spring
Cam
Follower
Roller
Trip
Shaft
Trip
Latch
Trip
Latch
Roller
10
.
Trip
Latch
Roller
Support
11
.
Crankshaft
12
.
Cranks
13
.
Prop
Pin
14
.
Prop
15
.
Drive
Shaft
16
.
Cam
17
.
Check
Nut
18
.
Stop
Plate
19
.
Spring
Rod
20
.
Spring
21
.
Spring
22
.
Spring
Guide
23
.
Stop
Pin
24
.
Main
Shaft
Bearing
25
.
Cam
Shaft
Bearing
2
.
3
.
4
.
5
.
6
.
7
.
8
.
9
.
8
Courtesy of store.ips.us

Magne
Blast
Circuit
Breaker
GEK
-
7322
As
the
breaker
opens
to
interrupt
a
current
,
the
arc
first
starts
at
the
arcing
contacts
(
7
&
24
)
Figure
8
,
transfers
to
the
arc
runner
(
8
&
9
)
and
energizes
the
blow
-
out
coils
(
6
&
11
)
.
This
action
introduces
a
magnetic
field
between
the
pole
pieces
(
4
&
10
)
of
the
interrupter
thatforces
the
arc
deeper
into
the
arc
chute
(
3
)
.
At
the
time
the
arcing
con
-
tacts
part
a
discharge
of
air
is
expelled
through
the
booster
tube
(
25
)
across
the
arc
.
This
air
flow
assists
the
arc
transfer
and
interruption
by
blowing
the
arc
away
from
the
contacts
and
into
the
arc
chute
.
As
the
magnetic
field
forces
the
arc
deeper
into
the
interrupter
along
the
diverg
-
ing
arc
runners
,
the
field
is
progressively
increas
-
ed
by
the
insertion
of
each
additional
blow
-
out
coil
into
the
circuit
.
£
Q
13
I
4
;
15
2
16
3
-
i
4
17
r
~
!
5
-
18
19
6
r
~
20
8
2
1
2 2
9
23
10
24
25
12
26
27
1
-
tU
1
JL
.
‘
1
.
\
I
\
/
Fig
.
8
(
0132
C
2777
)
Cross
Section
of
Breaker
Pole
Unit
1
.
Box
Barrier
Catch
2
.
Box
Barrier
3
.
Arc
Chute
Side
4
.
Upper
Pole
Pieces
5
.
Upper
Blow
Out
Core
R
.
Upper
Blow
Out
Coil
.
Stationary
Arcing
Contact
Upper
Arc
Runner
9
.
Lower
Arc
Runner
10
.
Lower
Pole
Pieces
llo
Lower
Blow
Out
Coil
12
.
Lower
Blow
Out
Core
13
.
Front
Bushing
14
.
Rear
Bushing
15
.
Upper
Horizontal
Barrier
16
.
Main
Operating
Crank
17
.
Spring
Retainer
18
.
Lower
Horizontal
Barrier
19
.
Operating
Rod
20
.
Stationary
Primary
Contact
21
.
Movable
Primary
Contact
22
.
Hinge
Cup
Bearing
23
.
Contact
Arm
Assembly
24
.
Movable
Arcing
Contact
25
.
Booster
Tube
and
Piston
26
.
Connection
Bar
27
.
Booster
Cylinder
9
Courtesy of store.ips.us

GEK
-
7322
Magne
Blast
Circuit
Breaker
The
arc
chute
has
a
series
of
interleaving
cer
-
amic
fins
,
Figure
19
.
As
the
arc
is
forced
into
the
interrupter
it
is
lengthened
in
the
gradually
deep
-
ening
serpentine
path
between
the
fins
so
that
the
electrical
resistance
of
the
arc
is
rapidly
increased
and
its
heat
is
absorbed
by
the
ceramic
material
.
The
increased
resistance
reduces
the
magnitude
and
phase
angle
of
the
current
and
at
an
early
current
zero
the
arc
cannot
re
-
establish
itself
and
interruption
occurs
.
Trip
Free
Operation
If
the
trip
coil
circuit
is
energized
while
the
breaker
is
closing
,
the
trip
armature
will
force
the
trip
latch
(
8
)
Figure
7
away
from
the
trip
roller
(
9
)
causing
the
mechanism
linkage
to
collapse
w
and
the
breaker
to
re
-
open
.
The
closing
cam
(
16
)
will
complete
its
closing
stroke
and
the
springs
will
re
-
charge
as
in
a
normal
closing
operation
.
ADJUSTMENTS
All
adjustments
should
be
checked
during
per
-
iodic
inspections
and
whenever
it
becomes
nec
-
essary
to
repair
or
replace
parts
that
have
become
worn
or
defective
while
in
service
.
The
following
adjustments
are
listed
in
the
order
in
which
they
are
to
be
checked
after
removing
the
box
barriers
and
front
cover
from
the
breaker
.
OR
MECHANISM
UNLESS
THE
CLOSING
SPRINGS
ARE
BLOCKED
AND
THE
OPENING
SPRINGS
HAVE
BEEN
TRIPPED
OPEN
OR
MECHANIC
-
ALLY
BLOCKED
.
THIS
MEASURE
IS
REQUIRED
TO
PREVENT
ACCIDENTAL
CLOSING
OR
TRIP
-
PING
.
Arcing
Contact
Wipe
Refer
to
Figure
9
.
Close
the
breaker
until
DO
NOT
WORK
ON
EITHER
THE
BREAKER
Vi
_
_
3
_
*
~
K
.
2
V
3
-
4
-
W
\
4
4
v
<
b
5
5
7
Arcing
Contact
Wipe
Primary
Contact
Wipe
Figure
9
(
0132
C
2778
)
Contact
Adjustments
1
.
Stationary
Primary
Contacts
2
.
Movable
Primary
Contacts
3
.
Buffer
Block
4
.
Stationary
Arcing
Contacts
5
.
Movable
Arcing
Contacts
6
.
Contact
Arm
7
.
Throat
Baffle
10
I
Courtesy of store.ips.us