GE POWER/VAC GEK 86132A User manual

GEK
8.6
-
132
B
SUPERSEDES
GEK
86
!
!
32
A
INSTRUCTIONS
POWER
/
VAC
*
VACUUM
CIRCUIT
BREAKER
WITH
ML
-
18
MECHANISM
v
-
Courtesy of NationalSwitchgear.com

«
...
y
CONTENTS
Page
No
.
1
1
.
INTRODUCTION
1.1
.
Safety
.
.
.
1.1
.
1
,
General
1.1
.
2
.
Specific
2
.
DESCRIPTION
3
.
RECEIVING
,
HANDLING
AND
STORAGE
3.1
.
Receiving
.
.
3.2
.
Handling
3.3
.
Storage
. . ..
4
.
INSTALLATION
4.1
.
Safety
Precautions
4.2
.
Interlocks
4.2
.
1
.
Rating
Interference
Plate
4.2
.
2
.
Closing
Spring
Discharge
Interlock
4.2
.
3
.
Negative
Interlock
Roller
4.2
.
4
.
Positive
Interlock
Bar
4.2
.
5
.
Closing
Spring
Gag
Interlock
.
..
.
1
1
1
2
2
2
2
2
2
2
3
3
3
3
3
3
5
.
OPERATION
5.1
,
Close
Spring
Charging
5.2
.
Closing
Operation
5.3
,
Opening
Operation
5.4
.
Trip
Free
Operation
6
.
CONTROL
CIRCUIT
7
.
MECHANICAL
CHECKING
AND
SLOW
CLOSING
7.1
.
Visual
Inspection
7.2
.
Closing
Spring
Charging
,
, , ,
7.3
.
Closing
Spring
Gag
7.4
.
Slow
ClosiiVg
7.5
.
Gag
Plate
Removal
8
.
DIMENSIONAL
CHECKS
8.1
.
Primary
Contact
Erosion
8.2
.
Spring
Wipe
8.3
.
Contact
Gap
.
8.4
.
Close Coil
Plunger
Gap
8.5
.
Trip
Coil
Plunger
Gap
8.6
.
Control
Switch
Adjustment
3
4
»
*
4
4
5
5
5
i
*
5
5
5
5
5
6
6
6
6
6
6
6
>
7
Courtesy of NationalSwitchgear.com

9
.
ELECTRICAL
CHECKS
9.1
.
Electrical
Operation
9.2
.
High
-
Potential
Test
9.2
.
1
,
Primary
Circuit
9.2
.
2
.
Secondary
Circuit
9.3
.
Primary
Circuit
Resistance
.
.
..
.
.
9.4
.
Vacuum
Interrupter
Integrity
Test
9.5
.
Insulation
Tests
10
.
INTERLOCK
FUNCTIONAL
CHECK
11
.
MAINTENANCE
11.1
,
General
11.2
,
Service
Conditions
11.3
,
Fault
Interruptions
11.4
,
Contact
Erosion
11.5
,
Transfer
Finger
Wear
11.6
,
Mechanism
11.7
,
Primary
Insulation
Parts
11.8
,
Lubrication
11.9
,
Recommended
Maintenance
.
.
.
12
.
TIMING
13
.
OPENING
AND
CLOSING
SPEED
.
.
7
7
7
7
7
7
7
8
8
9
9
9
9
9
9
:
V
;
.
10
10
10
10
10
1 1
14
.
REPAIR
AND
REPLACEMENT
14.1
.
General
14.2
.
Replacement
of
Interrupter
Assemblies
14.3
.
Primary
Disconnect
Fingers
14.4
.
Mechanism
.
.
.
.
14.5
.
Control
Switches
11
1 1
1 1
12
12
.
.
A
12
<
4
44
4
4
•
I
4
4
4
4
<
4
4
•
4
44
«
4
4
4
4
»
44
4
44
4
»
44
»
4
4
»
4
*
4
4
4
»
44
4
4
4
»
44
4
>
4
4
44
4
«
4
*
14.6
.
Trip
Coil
Replacement
.
.
.
.
.
.
14.7
.
Closing
Coil
Replacement
..
.
,
14.8
.
Auxiliary
Switch
Replacement
14.9
.
Motor
Replacement
14
,
10
“
Y
”
12
.
vi
'
V
12
12
13
Rejay
Replacement
13
1
.
15
.
RENEWAL
PARTS
15.1
.
Ordering
Instructions
13
4
4
13
16
.
MECHANICAL
ADJUSTMENTS
16.1
.
General
16.2
.
Wipe
Adjustment
.
.
.
..
.
.
.
.
16.3
.
Contact
Gap
Adjustment
.
.
16.4
.
Trip
Coil
Plunger
16.5
.
Close
Coil
Plunger
16.6
.
Close
Latch
Stop
Bolt
.
.
.
.
.
16.7
.
Spring
Discharge
Interlock
.
16.8
.
Negative
Interlock
13
13
13
14
14
14
14
14
.
14
vv
Courtesy of NationalSwitchgear.com

LIST
OF
ILLUSTRATIONS
Page
No
.
FIGURE
1
RATING
INTERFERENCE
PLATE
FIGURE
2
FRONT
VIEW
OF
POWER
/
VAC
*
BREAKER
W
/
FRONT
COVER
.
FIGURE
3
FRONT
VIEW
OF
POWER
/
VAC
*
BREAKER
W
/
O
FRONT
COVER
FIGURE
4
MANUAL
CHARGING
.
FIGURE
5
MANUAL
CHARGING
FIGURE
6
TOGGLE
LINKAGE
POSITIONS
—
ML
-
18
MECHANISM
FIGURE
7
EROSION
INDICATOR
FIGURE
8
OPERATING
ROD
ASSEMBLY
FIGURE
9
SCHEMATIC
OF
ML
-
18
MECHANISM
FIGURE
10
TYPICAL
WIRING
DIAGRAM
FOR
ML
-
18
MECHANISM
FIGURE
11
POWER
/
VAC
*
BREAKER
LEFT
-
FRONT
VIEW
FIGURE
12
POWER
/
VAC
*
BREAKER
,
RIGHT
-
REAR
VIEW
FIGURE
13
TRIP
COIL
AND
LINKAGE
FIGURE
14
CLOSE
COIL
LINKAGE
FIGURE
15
BOTTOM
VIEW
OF
ML
-
18
MECHANISM
FIGURE
16
CONTACT
GAP
ADJUSTMENT
.
..
.
FIGURE
17
SPRING
DISCHARGE
INTERLOCK
FIGURE
18
SAMPLE
OPERATING
SPEED
GRAPHS
FIGURE
19
FLEX
CABLE
CONNECTION
FIGURE
20
NEGATIVE
INTERLOCK
FIGURE
C
CLOSE
COIL
PLUNGER
GAP
FIGURE
G
CONTACT
GAP
FIGURE
L
CLOSE
LATCH
STOP
FIGURE
S
CONTROL
SWITCHES
FIGURE
T
TRIP
COIL
PLUNGER
GAP
FIGURE
W
SPRING
WIPE
15
16
16
i
•
>
»
t
>
i
f
i
•
<
i
17
17
18
,
19
«
I
»
t
«
•
«
I
•
I
•
•
M
«
I
f
t
I
20
21
22
,
23
24
25
v
-
•
•
25
26
27
28
29
30
31
A
32
33
34
35
36
37
38
39
T
-
*
*
\
Courtesy of NationalSwitchgear.com

POWER
/
VAC
*
VACUUM
CIRCUIT
BREAKER
WITH
ML
-
I
8
MECHANISM
1
.
INTRODUCTION
1
1
,
1.2
.
SPECIFIC
DO
NOT
WORK
ON
AN
ENERGIZED
BREAKER
.
IF
WORK
HAS
TO
BE
PERFORMED
ON
THE
BREAKER
,
TAKE
IT
OUT
OF
SERVICE
AND
REMOVE
IT
FROM
THE
METALCLAD
EQUIPMENT
.
DO
NOT
WORK
ON
ANY
PART
OF
THE
BREAKER
WITH
THE
TEST
COUPLER
ENGAGED
,
All
spring
charged
mechanisms
related
to
a
breaker
must
.
be
serviced
only
by
skilled
and
knowledgeable
personnel
capable
of
releasing
each
spring
load
in
a
controlled
manner
.
PAR
-
TICULAR
CARE
MUST
BE
EXERCISED
TO
KEEP
PERSONNEL
CLEAR
OF
MECHANISMS
WHICH
ARE
TO
BE
OPERATED
OR
RELEASED
,
Information
on
construction
of
such
mechanisms
is
provided
in
this
in
-
struction
book
.
Operational
tests
and
checks
should
be
made
on
a
breaker
after
maintenance
,
before
it
is
returned
to
service
,
to
insure
that
it
is
capable
of
operating
properly
.
The
extent
of
such
tests
and
checks
should
be
consistent
with
the
level
of
maintenance
performed
,
If
maintenance
on
the
Power
/
Vac
*
breaker
is
being
performed
to
an
extended
schedule
such
as
a
5
-
year
or
10
-
year
program
the
vacuum
interrupter
integrity
test
should
be
performed
each
time
the
breaker
is
removed
from
the
metalclad
switchgear
for
reasons
other
than
scheduled
break
-
er
maintenance
if
it
has
been
more
than
one
year
since
the
last
vacuum
integrity
test
.
Interlocks
are
provided
for
the
safety
of
the
operator
and
correct
operation
of
the
breaker
,
If
an
interlock
does
not
function
as
described
DO
NOT
MODIFY
OR
DISFIGURE
THE
PARTS
.
DO
NOT
FORCE
THE
DEVICE
INTO
POSITION
.
CONTACT
THE
NEAREST
GE
APPARA
-
TUS
AND
ENGINEERING
SERVICE
OFFICE
FOR
INSTRUCTIONS
.
1.1
,
SAFETY
Each
user
has
the
responsibility
to
instruct
all
personnel
associated
with
this
equipment
on
all
safety
precautions
which
must
be
observed
.
\
*
7
-
•
•
The
following
are
recommendations
to
be
considered
in
a
user
’
s
safety
program
,
These
recommendations
are
not
in
-
tended
to
supplant
the
user
’
s
responsibility
for
devising
a
complete
safety
program
and
shall
not
be
considered
as
such
.
They
are
rather
suggestions
to
cover
the
more
important
aspects
of
personnel
safety
related
to
circuit
breakers
.
G
E
neither
condones
nor
assumes
any
responsibility
for
user
practices
which
deviate
from
these
recommendations
.
1.1
.
1
,
GENERAL
All
personnel
associated
with
installation
,
operation
and
maintenance
of
power
circuit
breakers
should
be
thoroughly
instructed
and
supervised
regarding
power
equipment
in
general
as
well
as
the
particular
model
of
equipment
with
which
they
are
working
.
Instruction
books
and
service
advices
should
be
closely
studied
and
followed
,
including
appropriate
sections
of
“
National
Electric
Safety
Code
"
ANSI
C
2
-
I
984
and
revisions
thereof
.
Maintenance
programs
must
be
well
planned
and
carried
out
consistent
with
both
customer
experience
and
man
-
ufacturer
’
s
recommendations
including
service
advices
and
instruction
books
.
Good
maintenance
is
essential
to
breaker
reliability
and
safety
.
-
•
•
Local
environment
and
breaker
application
must
be
con
-
sidered
in
such
programs
,
inclucp
-
jig
such
variables
as
ambient
temperatures
,
actual
continuou
^
current
,
number
of
opera
-
tions
,
type
of
interrupting
duty
,
and
any
unusual
local
condition
such
as
corrosive
atmosphere
or
major
insect
problems
.
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
.
Should
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
G
E
Co
.
To
the
extent
required
,
the
products
described
herein
meet
applicable
ANSI
,
IEEE
and
NEMA
standards
,
but
no
such
assurance
is
given
with
respect
to
local
codes
and
ordinances
because
they
vary
greatly
.
*
Registered
Trademark
of
GE
.
•
.
*
:
t
Courtesy of NationalSwitchgear.com

both
rear
wheels
in
both
directions
to
prevent
any
accider
movement
.
2
.
DESCRIPTION
The
Power
Vac
*
vacuum
circuit
breaker
is
a
horizontal
drawout
removable and
interchangeable
interrupting
element
for
use
in
metalclad
switchgear
to
provide
protection
and
control
of
electrical
apparatus
and
power
systems
.
The
Power
Vac
*
Type
VB
1
circuit breaker
with
ML
-
I
8
mechan
-
ism
is
available
in
continuous
current
ratings
of
1200
and
2000
amperes
in
accordance
with
industry
standards
.
A
combina
-
tion
1200
2000
ampere
breaker
is
also
available
.
Refer
to
the
breaker
nameplate
for
complete
rating
information
of
any
particular
breaker
,
The
nameplate
also
describes
the
control
power
requirements
for
that
breaker
.
The
application
of
a
breaker
must
be
such
that
its
voltage
,
current
and
interrupting
ratings
are
never
exceeded
.
Since
this book
is
written
to
include
all
ratings
of
the
breaker
,
as
well
as
several
design
variations
,
the
instructions
will
be
of
a
general
character
and
all
illustrations
will
be
typical
unless
otherwise
specified
.
3.3
.
STORAGE
It
is
recommended
that
the
breaker
be
put
into
sen
immediately
in
its
permanent
location
.
If
this
is
not
possil
the
following
precautions
must
be
taken
to
assure
the
pro
)
storage
of
the
breaker
.
The breaker
should
be
carefully
protected
against
ct
densation
,
preferably
by
storing
it
in
a
warm
,
dry
room
moderate
temperature
such
as
40
°
to
100
°
F
.
High
humid
may
have
an
adverse
effect
on
the
insulating
parts
and
shot
be
avoided
.
Circuit
breakers
for
outdoor
metalclad
switc
gear
should
be
stored
in
the
equipment
only
when
power
available
and
the
heaters
are
in
operation
to
prevent
cc
densation
.
The
breaker
should
be stored
in
a
clean
location
,
free
fre
corrosive
gases
or
fumes
.
Particular
care
should
be
taken
protect
the
equipment
from
moisture
and
cement
dust
,
as
tl
combination
has
a
very
corrosive
effect
on
many
part
'
s
.
Rollers
,
latches
,
etc
.
of
the
operating
mechanism
should
1
coated
with
0282
A
2048
P
009
grease
to
prevent
rusting
.
3
.
RECEIVING
,
HANDLING
AND
STORAGE
3.1
.
RECEIVING
Each
breaker is
carefully
inspected
before
shipment
.
Im
-
mediately
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
claim
should
be
filed
im
-
mediately
with
the
transportation
company
and
the
nearest
GE
Sales
Office
should
be
notified
,
It
is
expected
that
due
care
will
be
exercised
during
the
unpacking
and
installation
of
breakers
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
.
...
If
the
breaker
is
stored
for
any
length
of
time
,
it
should
1
inspected
periodically
to
see
that
rusting
has
not
started
at
to
insure
good
mechanical condition
,
Should
the
breaker
1
stored
under
unfavorable
atmospheric
conditions
,
it
shou
be
cleaned and
dried
before
being
placed
in
service
;
v
,
’
\
v
.
-
'
-
4
.
INSTALLATION
4
,
1
.
SAFETY
PRECAUTIONS
This circuit
breaker
uses
powerful
springs
for
energ
storage
.
DO NOT
WORK
ON
THE
INTERRUPTERS
01
THE
MECHANISM
UNLESS
THE
CIRCUIT
BREAKE
!
IS
IN
THE
“
OPEN
”
POSITION
AND
BOTH
TH
CLOSING
AND
OPENING
SPRINGS
ARE
ElTliEI
DISCHARGED
OR
GAGGED
AND
ALL
ELEC
3.2
.
HANDLING
When
lifting
the
breake
^
use
of
the
specially
designed
lift
truck
is
recommended
.
It
is
-
necessary
to
use
the
truck when
placing
a
breaker
into
or
removing
it
from
the
TWO
-
HIGH
metalclad
equipment
.
If
it
is
necessary
to
lift
the
breaker
with
a
hoist
,
use
four
1
/
2
inch
diameter
hooks
rated
at
least
500
pounds
each
,
Lifting
locations
are
provided
in
the
frame
side
members
12
,
Fig
.
1
)
,
Use
a
spreader
wider
than
the breaker
to
prevent
the
slings
from
contacting
the
interrupter
supporting
insulating
material
parts
.
An
optional
accessory
lifting
sling
is
also
available
.
A
front
swivel
wheel
and
two
rear
wheels
are
provided
for
ease
of
movement
on
fiat
level
floors
.
When
unattended
breakers
are
left
on
a
floor
or
when
a
lift
truck
is
used
,
block
J
TRICAL
POWER
IS
REMOVED
.
These
precautions
ar
required
to
prevent
accidental
operation
.
Anyone
working
OJ
the
circuit
breaker
should
be
familiar
with
the
contents
of
thi
instruction
book
.
The
circuit
breaker
has
been
shipped
in
the
CLOSEE
position
.
After
removing
packing
material
,
open
the breake
:
by
pushing
in
on
the
manual
trip
button
(
3
,
Fig
.
2
)
,
Whilt
keeping
hands
away
front
moving
parts
,
and
verify
that
the
operation
counter
advances
one
count
.
2
Courtesy of NationalSwitchgear.com

r
'
:
\
4
,
2.4
.
POSITIVE
INTERLOCK
BAR
This
interlock
will
prevent
the
racking
of
a
closed
breaker
into
or
out
of
a
metalclad
compartment
.
A
linkage
connected
to
the
cross
shaft
extends
a
detente
angle
(
3
,
Fig
.
II
)
out
through
the
left
side
of
the
mechanism
frame
when
the
breaker
contacts
are
in
the
closed
position
.
If
the
breaker
is
fft
;
the
“
CONNECT
”
or
“
DISCONNECT
/
TEST
”
position
in
the
metalclad
the
detente
angle
locks
into
the
racking
mechanism
to
prevent
access
to
the
hex
section
of
the
racking
screw
.
;
Closing
and
opening
springs
are
now
in
their
discharged
positions
.
Check
this
by
first
pressing
the
manual
close
button
,
then
the
manual
trip
button
.
The
indicator
flags
on
the
front
of
the
breaker
should
show
“
OPEN
"
and
“
DIS
-
CHARGED
"
.
All
mechanical
and
electrical
checks
should
be
completed
before
putting
breakers
in
service
.
4.2
.
INTERLOCKS
Each
Power
/
Vac
*
vacuum
circuit
breaker
is
provided
with
the
following
interlocks
.
i
4.2
.
5
,
CLOSING
SPRING
GAG
INTERLOCK
This
interlock
is
provided
to
prevent
a
breaker
that
has
a
gagged
closing
spring
from
entering
a
metalclad
unit
,
This
function
is
accomplished
by
projecting
an
angle
(
1
,
Fig
.
II
)
out
of
the
left
front
side
of
the
mechanism
when
the
closing
spring
is
gagged
,
This
angle
will
interfere
with
the
racking
mee
.
lj
anism
and
block
entry
into
the
metalclad
unit
when
the
Closing
Spring
Gag
Access
Door
is
open
.
4.2
,
1
.
RATING
INTERFERENCE
PLATE
This
interlock
(
l
.
Fig
.
l
)
permits
only
a
breaker
with
a
matching
continuous
current
,
voltage
and
interrupting
rating
to
be
inserted
into
a
metalclad
compartment
of
identical
rating
.
The
combination
1200
/
2000
ampere
breaker
can
be
used
in
either
a
1200
or
a
2000
ampere
compartment
,
The
rating
interference
plate
must
be
adjusted
to
match
the
current
rating
of
the
compartment
.
This
adjustment
is
done
by
positioning
the
outer
interference
plate
so
that
the
edge
of
the
plate
lines
up
with
the
current
indicated
on
the
label
attached
,
to
the
breaker
just
above
the
rating
interference
plate
.
*
•
••
:
*
,
•
5
.
OPERATION
The
Power
/
Vac
*
vacuum
circuit
breaker
uses
a
sealed
vacuum
power
interrupter
to
establish
and
interrupt
a
pri
-
mary
circuit
.
Primary
connections
to
the
associated
metalclad
\
’
4.2
.
2
,
CLOSING
SPRING
DISCHARGE
INTERLOCK
This
interlock
(
4
,
Fig
,
12
)
prevents
racking
into
or
out
of
the
metalclad
compartment
a
breaker
that
has
the
closing
spring
charged
.
This
action
is
accomplished
by
a
roller
on
the
right
side
of
the
breaker
mechanism
which
contacts
the
racking
mechanism
and
discharges
the
closing
spring
unless
the
breaker
is
in
the
“
DISCONNECT
/
TEST
”
position
or
the
“
CONNECT
”
position
in
the
metalclad
compartment
.
This
interlock
also
opens
the
CL
/
M
§
j
|
witch
in
the
motor
circuit
to
prevent
electrical
charging
of
the
closing
spring
when
the
breaker
is
between
the
"
DISCONNECT
/
TEST
"
and
the
“
CONNECT
"
position
in
the
metalclad
compartment
.
switchgear
are
made
by
horizontal
bars
and
disconnect
fingers
,
electrically
and
mechanically
connected
to
the
vac
-
uum
interrupters
.
Molded
supports
,
one
per
pole
oh
a
'
three
pole
breaker
,
provide
interchangeable
mountings
for
primary
bars
,
interrupters
,
current
transfer
fingers
,
and
heat
dissipation
fins
(
where
used
)
.
The
operating
mec
^
aAl
'
^
provides
vertical
motion
at
each
pole
location
in
order
to
JiH
-
move
the
lower
contact
of
the
vacuum
interrupters
front
ap
open
position
to
a
spring
-
loaded
closed
position
and
then
back
to
the
open
position
on
command
The
ML
-
18
mechanism
(
Fig
,
9
)
is
of
the
stored
-
energv
type
and
uses
a
gearmotor
to
charge
a
closing
spring
.
During
a
closing
operation
,
the
energy
stored
in
the
closing
spring
is
used
to
close
the
vacuum
interrupter
contacts
,
charge
the
wipe
springs
which
load
the
contacts
,
charge
the
opening
springs
,
and
overcome
bearing
and
other
frictional
forces
,
The
energy
then
stored
in
the
wipe
and
opening
springs
will
open
the
contacts
during
an
opening
operation
,
Closing
and
opening
operations
are
controlled
electrically
by
the
control
switch
on
the
metalclad
door
or
remote
relaying
.
Mechanical
control
is
provided
by
manual
close
and
4
,
2.3
.
NEGATIVE
INTERLOCK
ROLLER
The
function
of
this
interlock
(
5
,
Fig
,
II
)
is
to
remove
the
trip
latch
from
the
trip
roller
thereby
preventing
a
closing
operation
.
The
interlock
also
opens
the
LCS
switch
in
the
closing
circuit
thereby
removing
the
close
circuit
.
power
,
The
negative
trip
interlock
is
functional
while
the
breaker
is
being
moved
between
the
“
DISCONNECT
/
TEST
"
and
the
“
CON
-
NECT
"
position
in
the
metalclad
and
upon
withdrawal
from
the
metalclad
compartment
,
s
'
h
'
3
Courtesy of NationalSwitchgear.com

trip
buttons
on
the
circuit
breaker
.
The
closing
spring
may
be
manually
charged
,
and
a
method
for
slow
closing
the
primary
contacts
is
available
when
the
circuit
breaker
is
withdrawn
from
the
metalclad
cubicle
.
See
MECHANICAL
CHECK
-
ING
AND
SLOW
CLOSING
,
The
mechanism
will
operate
at
the
a
-
c
or
d
-
c
voltage
indicated
on
the
circuit
breaker
nameplate
.
Manual
pumping
of
the
handle
advances
the
ratchet
wheel
and
the
holding
pawl
prevents
counter
-
rotation
while
,
the
handle
is
returning
for
another
stroke
.
Six
to
eight
complete
strokes
of
the
manual
handle
are
required
for
one
complete
spring
-
charging
operation
.
When
the
spring
charge
indicatoj
(
9
,
Fig
.
3
)
shows
“
CHARGED
”
,
MANUAL
CHARGING
MUST
BE
DISCONTINUED
TO
AVOID
MECHANISM
DAMAGE
.
5.2
.
CLOSING
OPERATION
.
(
REFER
TO
FIG
.
9
)
By
either
energizing
the
close
solenoid
or
depressing
the
manual
close
button
,
the
close
latch
(
8
,
view
C
)
is
rotated
,
releasing
the
closing
spring
(
1
,
view
B
)
.
This
action
releases
the
'
energy
in
the
closing
spring
and
transmits
it
to
the
closing
cam
(
9
,
view
D
)
and
closing
roller
(
10
,
view
D
)
arid
causes
the
linkage
to
rise
until
the
prop
(
1
l
,
view
D
)
can
Slip
under
the
close
roller
(
10
,
view
D
)
and
hold
the
linkage
in
place
.
As
the
linkage
moves
,
the
output
crank
(
12
,
view
D
)
rotates
the
cross
shaft
(
13
,
view
D
)
which
in
turn
rotates
the
phase
bell
cranks
(
14
,
view
E
)
on
all
three
poles
.
The
rotation
of
the
phase
bell
cranks
compresses
the
two
opening
springs
(
15
,
view
E
)
on
poles
1
and
3
,
closes
the
vacuum
interrupters
and
compresses
the
wipe
springs
(
16
,
view
E
)
on
each
pole
.
The
rotation
of
the
cross
shaft
(
13
,
view
D
)
also
changes
the
auxilliary
switch
(
17
,
view
D
)
position
and
the
position
flag
on
the
front
panel
will
then
indicate
“
CLOSED
”
.
After
the
breaker
is
closed
,
the
charging
motor
is
again
energized
and
the
closing
spring
is
charged
as
described
under
“
CLOSE
SPRING
CHARG
-
ING
”
.
Spring
charging
is
possible
when
the
breaker
is
in
the
closed
position
because
the
linkage
is
held
in
place
by
the
prop
.
C
-
s
5.1
,
CLOSE
SPRING
CHARGING
Figure
9
shows
a
front
view
of
the
ML
-
18
in
a
schematic
form
.
The
primary
contacts
are
open
and
the
closing
springs
charged
.
The
closing
spring
charging
system
consists
of
a
closing
spring
(
l
.
view
B
)
mounted
on
the
left
side
of
the
breaker
and
the
electrical
charging
system
mounted
on
the
right
side
of
the
breaker
.
Both
components
are
fastened
to
the
cam
shaft
(
2
,
view
B
)
,
A
manual
charging
system
(
3
,
view
A
)
is
provided
so
that
the
mechanism
can
be
slow
closed
and
the
closing
spring
can
be
charged
if
there
is
a
loss
of
electrical
control
power
.
Spring
charging
is
accomplished
electrically
by
a
rotating
eccentric
on
the
output
shaft
of
the
gear
motor
driving
pivoted
charging
arms
(
4
,
view
C
)
that
oscillate
about
the
centerline
of
a
ratchet
wheel
(
5
,
view
C
)
.
A
driving
pawl
(
6
,
view
C
)
,
mounted
within
the
charging
arms
,
oscillates
with
the
charging
arms
.
Starting
from
its
rear
-
most
position
,
as
the
charging
arms
rotate
forward
,
a
spring
forces
engagement
of
the
driving
pawl
with
a
tooth
on
the
ratchet
wheel
.
The
ratchet
wheel
is
advanced
by
the
rotating
charging
arms
and
pawl
assembly
.
Advancement
of
one
tooth
spacing
is
provided
for
each
oscillation
of
the
system
,
The
ratchet
motion
is
restricted
to
one
direction
by
a
spring
-
loaded
holding
pawl
that
prevents
the
ratchet
wheel
from
going
backwards
as
the
charging
arms
oscillate
back
to
pick
up
the
next
tooth
.
Thirteen
complete
cycles
of
the
charging
arms
are
needed
for
a
full
charge
of
the
closing
spring
.
The
efficient
,
compact
gear
motor
accomplishes
this
action
in
just
about
two
seconds
.
When
the
charging
cycle
is
.
^
omplete
,
the
ratchet
wheel
is
positioned
so
that
a
missing
to
.
oth
is
adjacent
to
the
driving
pawl
and
any
motor
overspin
will
not
drive
the
ratchet
wheel
,
thus
preventing
damage
to
the
system
,
When
the
spring
is
completely
charged
,
the
assembly
is
retained
in
that
position
by
the
close
latch
,
until
it
is
desired
to
close
the
circuit
breaker
.
The
closing
coil
cannot
be
electrically
energized
unless
the
closing
spring
is
completely
charged
.
This
action
is
prevented
by
the
52
CHG
switch
in
the
closing
circuit
.
The
manual
charging
system
(
3
,
view
A
)
works
directly
on
the
cam
shaft
where
a
one
-
way
clutch
(
7
,
view
A
)
driven
by
a
manual
handle
provides
rotation
of
the
ratchet
wheel
.
i
5.3
.
OPENING
OPERATION
.
(
REFER
TO
FIG
.
9
)
By
either
energizing
the
trip
solenoid
(
18
,
view
.
B
)
or
depressing
the
manual
trip
button
(
23
,
view
B
)
,
the
trip
,
latch
(
19
,
view
D
)
is
rotated
,
permitting
the
linkage
to
collapse
and
the
vacuum
interrupter
contacts
to
open
under
the
force
of
the
wipe
springs
(
16
,
view
E
)
and
opening
springs
(
15
,
view
E
)
,
At
the
end
of
the
opening
stroke
the
center
phase
wipe
spring
assemble
hits
the
stop
on
the
frame
that
limits
overtravel
and
rebound
,
Rotation
of
the
cross
shaft
from
the
closed
to
the
open
position
operates
the
auxiliary
switch
(
17
,
view
D
)
which
opens
the
trip
coil
circuit
.
If
the
closing
spring
has
been
recharged
,
the
linkage
will
be
reset
and
the
trip
latch
will
be
in
place
on
the
trip
roller
ready
for
another
closing
operation
.
V
*
?
:
>
"
*
:
v
If
the
closing
spring
has
not
been
recharged
,
the
trip
latch
may
be
held
out
of
position
.
A
latch
-
checking
switch
(
21
.
,
view
C
)
will
not
close
unless
the
latch
is
in
its
normal
position
!
The
contacts
of
this
latch
-
checking
switch
are
in
the
closing
circuit
so
that
electrical
closing
is
blocked
when
the
trip
latch
not
reset
.
4
Courtesy of NationalSwitchgear.com

r
the
spring
load
is
held
by
the
closing
latch
,
the
spring
indicator
(
8
,
Fig
,
2
)
will
change
from
“
DISCHARGED
”
to
“
CHARGED
”
,
and
a
positive
snap
will
be
heard
as
the
spring
travels
over
center
,
After
the
spring
is
completely
charged
,
as
indicated
above
,
further
forcing
the
charging
handle
may
cause
damage
to
the
closing
latch
and
its
associated
parts
.
5.4
,
TRIP
-
FREE
OPERATION
.
(
REFER
TO
FIG
.
9
)
The
linkage
is
mechanically
trip
-
free
in
any
location
on
the
closing
stroke
.
Electrically
energizing
the
trip
coil
while
closing
will
,
after
the
auxiliary
switch
contacts
change
po
-
sition
,
rotate
the
trip
latch
and
permit
the
circuit
breaker
to
open
fully
.
The
linkage
will
reset
as
in
a
normal
open
operation
and
the
closing
spring
will
recharge
as
described
under
SPRING
CHARGING
.
7.3
.
CLOSING
SPRING
GAG
Insert
the
closing
spring
gag
plate
(
1
,
Fig
.
4
)
by
opening
the
closing
spring
gag
hole
cover
and
inserting
the
tip
of
the
,
gag
plate
between
the
end
of
the
spring
and
the
spring
guide
and
engaging
the
detentes
on
the
gag
plate
into
the
slots
In
‘
the
closing
spring
guide
.
Note
that
when
the
closing
spring
'
guide
is
exposed
for
gagging
,
an
interference
angle
is
exposed
on
the
left
side
of
the
breaker
(
I
,
Fig
.
II
)
.
With
the
closing
spring
in
the
gagged
position
,
this
angle
will
provide
interference
preventing
use
of
the
lift
truck
and
racking
of
the
breaker
element
.
No
attempt
should
be
made
to
alter
,
,
modify
-
or
othewise
make
inoperative
this
safety
feature
.
With
the
gag
plate
in
position
,
depress
the
manual
close
button
.
This
action
will
partially
discharge
the
closing
spring
and
also
partiaiiy
close
the
vacuum
interrupter
contacts
.
Do
not
energize
tjie
secondary
control
circuit
at
this
time
.
6
.
CONTROL
CIRCUIT
A
typical
POWER
/
VAC
circuit
breaker
ML
-
18
mechan
-
ism
wiring
diagram
is
shown
in
Fig
.
10
.
Check
the
wiring
diagram
supplied
with
the
actual
circuit
breaker
for
its
wiring
.
The
close
spring
charging
motor
circuit
is
established
through
the
CL
/
MS
switch
if
the
close
latch
is
reset
and
the
SM
/
LS
switch
if
the
closing
spring
is
discharged
,
When
the
closing
spring
is
charged
,
the
SM
/
LS
interrupts
the
circuit
.
The
close
coil
circuit
is
established
through
two
normally
closed
52
Y
relay
contacts
,
and
the
latch
checking
switch
LCS
,
if
the
trip
latch
is
reset
.
An
auxiliary
switch
contact
52
b
is
also
in
series
with
the
close
coil
and
closes
when
the
breaker
is
open
and
opens
when
the
breaker
is
closed
.
During
a
,
close
operation
,
cam
rotation
closes
the
SM
/
LS
contact
allowing
the
52
Y
relay
to
be
energized
opening
its
contacts
in
the
close
coil
circuit
and
sealing
itself
in
through
one
of
its
own
contacts
to
the
close
signal
.
This
seal
-
in
action
prevents
reclosing
on
a
sustained
close
command
as
the
close
signal
must
be
removed
to
drop
out
the
Y
relay
and
reestablish
the
closing
circuit
,
thereby
providing
an
anti
-
pump
feature
.
Circuit
breaker
mounted
auxiliary
switch
contacts
not
used
in
the
control
circuit
are
brought
out
for
control
and
indication
functions
.
The
metalclad
equipment
may
provide
a
breaker
-
operated
stationary
auxiliary
switch
for
addtional
contacts
.
S
'
'
\
7
,
4
.
SLOW
CLOSING
To
manually
slow
close
the
breaker
contacts
,
put
the
manual
charge
handle
on
the
manual
charge
lever
and
move
the
handle
up
and
down
.
The
breaker
will
be
fully
closed
when
the
spring
charge
indicator
shows
“
CHARGED
;
(
CA
UT
10
N
:
WITH
THE
GAG
PLATE
INSTALLED
.
THt
BREAKER
CLOSED
AND
OPENING
SPRINGS
CHARGED
,
THE
BREAKER
CAN
BE
TRIPPED
AT
FULL
SPEED
.
y
•
\
7.5
.
GAG
PLATE
REMOVAL
To
remove
the
gag
plate
,
the
closing
spring
must
be
ftillv
charged
.
If
the
spring
charge
indicator
does
not
show
“
CHARGED
"
in
the
window
,
manually
charge
the
spring
until
it
does
.
Lift
up
and
push
in
on
the
gag
plate
to
clear
the
detentes
on
the
gag
plate
from
the
slots
in
the
closing
spring
guide
.
While
holding
the
gag
plate
up
,
remove
it
from
the
opening
.
Close
the
gag
hole
cover
.
For
safety
,
first
close
the
breaker
by
depressing
the
manual
“
CLOSE
”
button
and
then
depress
the
manual
“
TRIP
"
button
.
All
stored
energy
is
'
tiSW
v
^
$
r
'
7
.
MECHANICAL
CHECKING
AND
SLOW
CLOSING
7
*
1
.
VISUAL
INSPECTION
Visually
inspect
the
circuit
breaker
for
any
signs
of
damage
or
loose
hardware
.
7.2
.
CLOSING
SPRING
CHARGING
Manually
charge
the
breaker
closing
spring
using
the
charging
handle
provided
(
l
,
Fig
,
5
)
,
The
closing
spring
is
charged
by
a
ratcheting
mechanism
that
advances
by
one
ratchet
tooth
at
a
time
.
When
the
spring
is
fully
charged
and
removed
from
the
breaker
.
5
Courtesy of NationalSwitchgear.com

8
.
DIMENSIONAL CHECKS
With
the
breaker
closed
and
the
gag
plate
installed
,
perform
the
following
dimensional
checks
:
Measure
the
distance
between
the
two
lines
.
A
caliper
wi
give
an
accurate
reading
of
the
contact
gap
,
Dimension
0
The
gaps
must
be
between
the
0.600
inch
maximum
and
0
.
S
4
inch minimum
.
It
is
not
necessary
that
all
readings
cOrres
pond
,
A
properly
adjusted
breaker
will
have
more
gap
an
wipe
on
the
center
pole
than
on
the
outside
poles
.
The
following
dimensional
checks
are
in
the
operatin
mechanism which
is
accessible
from
the
bottom
.
To
accommc
date
these checks
,
the
breaker
should
be
turned
on
its
rigb
side
resting
on
two
-
by
-
fours
.
DO
NOT
use
the
portabl
breaker
lift
truck
.
CAUTION
:
do
not
allow
anything
to
com
in
contact
with the interlock
roller
on
the
right
side
of
th
mechanism
.
T
;
V
(
8.1
.
PRIMARY
CONTACT EROSION
With
the
closed
position
,
the erosion
disk
(
5
,
Fig
,
7
)
below
the
operating
rod
insulator
is
aligned
with
a
reference
arm
(
4
,
Fig
.
7
)
on
new
interrupters
.
As
contact
erosion
occurs
,
the
erosion
disk
will
move
upward
from
alignment
with
that
reference
arm
.
This
is
dimension
E
in
Figure
7
,
Detail
A
,
When
erosion
reaches
1
/
8
inch
,
the
POWER
/
VAC
*
inter
-
rupter
^
should be
replaced
.
Do
not
readjust
the
alignment of
the
erosion
indicator
arm
except
when
installing
a
new
vacuum
interrupter
,
8.4
.
CLOSE COIL
PLUNGER
GAP
The close
coil
plunger
gap
is
shown
in
Figure
C
.
With
th
'
closing
spring
discharged
,
operate
the
plunger
to
imak
<
certain
that
the
plunger
moves
freely
over
its
full
stroke
itith
coil
.
To
check
the
closing
coil
plunger
gap
the
breaker
sjbtduh
be
open
and
the
closing spring
charged
and
gagged
.
Dimen
sion
C
is
obtained
depressing
the
close
plunger
button
unti
resistance
is
felt
.
The
gap
between
the
plunger
button and
th
<
coil
housing
should
be
between
0.250
and
0.300
of
an
inch
.
8.5
.
TRIP
COIL
PLUNGER
GAP
8.2
.
SPRING
WIPE
With
the
breaker
closed
and
the
closing spring
gagged
,
measure
with
a
feeler
gauge
and
record
the
distance
between
the
top
of
the
wipe
indicator
and the bottom
of
the
erosion
disk
for
each
phase
(
see
Figure
W
,
Dimension
W
)
,
Trip
the
breaker
with
the
closing
spring
gag
plate
still
installed
and
measure
and record
the
distance
between
the
wipe
indicator
and
erosion disk
.
Subtract
the
closed
position
measurement
from
the
open
position
measurement
.
The
result
is the
amount
of
wipe
on
each
individual
pole
.
The
wipe
,
dimension
W
,
is
to
be
greater
than
0.075
inch
.
Adjustment
is
not
required
until
wipe
is
0.075
inch
or
less
.
If
adjustment
is
required
see
WIPE
ADJUSTMENT
in
MECHANICAL
ADJUST
-
MENTS
section
.
The
ML
-
18
mechanism
is
furnished
with
very
low
gradient
wipe
springs
so
that
adjustment
is
not
a
precision operation
and
considerable
loss
of
wipe
can
be
tolerated without
affecting
performance
.
The
trip
coil
plunger
gap
is
shown
in
Figure
T
.
With
th
<
breaker
in
the
open
position
and the
closing
spring
jn
tin
charged
position
,
make
certain
that
the
trip
linkage
and
trip
shaft
move
freely
over
the
full
plunger
travel
.
To
check
tin
trip
coil
plunger
gap
adjustment
,
the
breaker
is
to
be closet
with
the
closing spring
discharged
.
Dimension
T
between
the
plunger
button
and
the
coil
housing
should
be
between
6.20
C
and
0.250
inch
.
This
dimension
is
obtained
when
the
trip
plunger
button
is
depressed
until
resistance is felt
.
If
the
breaker
is
equipped
with
an
optional
second
trip
coil
;
us
<
same
procedure
.
8.6
.
CONTROL
SWITCH
ADJUSTMENT
•
‘
vV
:
:
;
'
V
'
;
L
7
8.3
.
CONTACT
GAP
The
method
of
measuring
the
contact
gap
is
as
follows
:
With
the
breaker
in
the
open
position
,
the
closing springs
charged
and
the
closing
spring
gag
plate
installed
,
apply
a
piece
of
masking
tape
to
the
surface of
the
operating
rod
insulator
as
shown
in
Figure
G
.
Using
a
reference
block
,
make
a
mark
on
the
tape
near
the
top
on
all
three
poles
.
It
is
also
advisable
to
put
a
reference
mark
on
the
tape
to
identify
to
which
pole
the
tape
is
applied
.
Remove
the
closing
spring
gag
plate
and close
the breaker
,
Using
the
same
procedure
as
above
,
re
-
mark
the
tape
.
This
new
mark
will
be
near
the
bottom
of
the
tape
.
Trip
the
breaker
,
remove
the
tapes
and
re
-
apply
them
to
a
flat
surface
.
The
breaker
is
to
be
in
the
open
position
with
the
opening
and
closing
springs
discharged
.
This
results
in
the
control
switch
plungers
being
in
the
depressed
position
.
The
switches
to
be
checked
.
are
shown
in
Figure
S
.
On
the
LCS
and
stacked
switches
(
SM
/
LS & CHG
)
,
the
plunger
rod
is
to
be
recessed
within
the
rear
of
the
switch
body
and
this
recess
is
to
be
6
to
1
/
32
inch
.
This is
a
visual
check
.
The
CL
/
MS
switch
with
wiring
terminals
on
the side
is
to
be
adjusted
as
described
above
.
For
the
CL
/
MS
switch
with
wiring
terminals
on
the
rear
the
plunger
is
set to
a
dimension
of
0.990
to
1.010
”
from
its
mounting
bracket
.
The
breaker
can now
be
placed
,
in
its
normal
upright
position
.
•
*
V
*
6
Courtesy of NationalSwitchgear.com