Westinghouse DH-P Series User manual

Instructions
for
P
Metal
Clad
Switchgear
Type
DH
-
P
Circuit
Breakers
orcer
ine
Westinghouse
Electric
Corporation
Assembled
Switchgear
&
Devices
,
East
Pittsburgh
,
Pa
.
I
.
B
.
32
-
253
-
1
Effective
May
,
1964
Cast Mechanism Style
Courtesy of NationalSwitchgear.com

2
Table
of
Contents
Page
Description
Introduction
General
Description
Receiving
,
Handling
Storing
Basic
Operating
Instructions
To
Lift
Breaker
.
To
Install
Arc
Chutes
,
4.16
KV
Breakers
To
Install
13.8
KV
Arc
Chutes
To
Install
Main
Barrier
To
Roll
Breaker
Around
Corners
To
Place
Breaker
in
First
Position
in
Cell
To
Place
Breaker
in
Fully
Energized
Position
To
Withdraw
Breaker
from
Energized
Position
to
Test
Position
To
Withdraw
Breaker
from
Cell
To
Engage
Secondary
Contacts
with
Breaker
in
Test
Position
To
Disengage
Operation
of
Stored
Energy
Mechanism
To
Charge
Closing
Spring
by
Hand
To
Spring
Close
Breaker
without
Electric
Power
,
.
.
.
To
Open
Breaker
by
Hand
To
Close
Breaker
by
Hand
with
Maintenance
Closing
Handle
To
Open
Breaker
Contacts
Slowly
How
the
Breaker
Works
Operating
Mechanism
,
Stored
Energy
Type
Anti
-
Close
Interlock
Operating
Mechanism
,
D
.
C
.
Solenoid
Type
Chassis
Levering
Device
and
Breaker
Interlock
Floor
Interlock
and
Operating
Levers
Automatic
Floor
Tripping
and
Closing
Spring
Release
.
.
.
Secondary
Contacts
Rail
Latch
Puffer
Mechanism
Panel
Closing
Spring
Hand
Charge
Device
for
Stored
Energy
Mechanism
Maintenance
Closing
and
Opening
Pole
Units
Contacts
Arc
Chutes
6
7
7
8
8
8
8
8
8
9
9
9
10
10
10
10
10
10
11
11
11
11
11
11
12
13
13
13
14
43
43
43
44
44
44
44
45
45
45
i
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3
Table
of
Contents
-
Continued
Page
Description
Maintenance
Guide
-
Inspection
,
Adjustments
and
General
Maintenance
Contacts
Settings
Contact
Replacement
Stored
Energy
Mechanism
Solenoid
Mechanism
,
Inspection
and
Adjustment
Mechanical
Timing
Arc
Chute
Inspection
and
Maintenance
Broken
or
Cracked
Ceramic
Parts
Erosion
of
Ceramics
Dirt
in
Arc
Chute
Cleaning
Arc
Shields
Lubrication
At
the
2000
Operation
Maintenance
Period
4.16
KV
and
13.8
KV
Solenoid
Mechanism
Roller
Bearings
on
all
Mechanisms
Stored
Energy
Mechanism
Removing
and
Installing
Spring
Charge
Motor
Removal
of
Closing Spring
Parts
Identification
Renewal
Parts
Chassis
Parts
Stored
Energy
Mechanism
-
All
Ratings
Solenoid
Mechanism
Rating
Table and
Weights
46
47
48
48
49
50
50
51
51
51
51
51
52
52
52
52
52
53
53
53
,
54
55
55
55
56
List
of
Illustrations
Page
Figure
General
Arrangement
of
Type
50
-
DH
-
P
75
Circuit
Breaker
Installing
Arc
Chute
of
Type
50
-
DH
-
P
75
Breaker
. .
Installing
Arc
Chute
of
Type
150
-
DH
-
P
500
Breaker
Arc
Chute
of
Type
50
-
DH
-
P
250
in
Place
on
Breaker
Releasing
Rail
Latch
Operation
of
Secondary
Contacts
with Breaker
in
Test
Position
la
.
,
lb
.
15
2
a
.
16
2
b
.
17
2
c
.
18
19
3
.
4
a
.
,
4
b
.
19
Courtesy of NationalSwitchgear.com

4
List
of
Illustrations
-
Continued
Page
Figure
Charging
Closing
Spring
by
Hand
,
4.16
KV
Breaker
.
.
Spring
Closing
Breaker
by
Hand
Release
,
4.16
KV
Breaker
Bottom
View
of
Stored
Energy
Mechanism
in
4.16
KV
Breaker
Schematic
Views
of
Stored
Energy
Mechanism
Spring
Charging
Parts
8
a
.
,
b
.
,
c
.
,
d
.
The
Four
of
the
Closing
Cam
and
Tripping
Linkage
(
a
)
Breaker
Open
and
Spring
Not
Charged
.
(
b
)
Breaker
Open
and
Spring
Charged
.
.
.
.
(
c
)
Breaker
Closed
and
Spring
Not
Charged
.
(
d
)
Breaker
Closed
and
Spring
Charged
.
..
Bottom
View
of
a
4.16
KV
Breaker
with
Solenoid
Mechanism
10
a
,
,
b
.
,
c
.
Schematic
Drawings
Showing
Positions
of
Solenoid
Mechanism
Linkage
(
a
)
Closed
and
Latched
(
b
)
Tripped
Free
(
c
)
Open
and
Reset
,
Ready
to
Close
.
.
.
.
.
4.16
KV
Breaker
Chassis
with
Stored
Energy
Mechanism
4.16
KV
Breaker
Chassis
with
Solenoid
Mechanism
Schematic
Drawings
of
Levering
Device
.
.
.
(
a
)
Breaker
in
Withdrawn
or
Test
Position
.
(
b
)
Breaker
in
Fully
Engaged
or
Energized
Position
Rear
View
of
4.16
KV
Breaker
Pole
Units
and
Details
for
1200
and
2000
Ampere
,
4.16
KV
Breakers
Pole
Units
and
Details
for
1200
and
2000
Ampere
,
13.8
KV
Breakers
Schematic
Drawing
of
Center
Coil
Type
of
Arc
Chute
as
used
on
the
DH
-
P
Line
of
Breakers
Partially
Assembled
View
and
Details
of
50
-
DH
-
P
250
Arc
Chute
Arc
Chute
Details
of
50
-
DH
-
P
75
Breaker
.
.
.
Lifting
the
Arc
Chute
of
13.8
KV
Breaker
with
Arc
Chute
Lifter
5
a
.
19
5
b
.
20
6
.
21
7
a
.
,
7
b
.
22
23
23
23
23
23
9
a
.
,
b
.
24
25
25
25
25
11
a
,
,
b
.
26
,
27
12
.
27
13
a
.
,
b
.
28
28
28
14
.
29
15
.
30
16
.
31
17
.
32
18
.
33
19
.
34
20
.
35
Courtesy of NationalSwitchgear.com

5
List
of
Illustrations
-
Continued
Page
Figure
Drawing
of
Contacts
Showing
Settings
and
Movements
Parts
for
Stored
Energy
Mechanisms
Stored
Energy
Mechanism
Parts
for
Crank
Shaft
Subassembly
Stored
Energy
Mechanism
Parts
for
Close
and
Trip
Subassemblies
Parts
for
Solenoid
Mechanism
Solenoid
Mechanism
21
.
36
22
.
37
,
38
23
.
39
24
.
40
25
.
41
26
.
42
Courtesy of NationalSwitchgear.com

6
INTRODUCTION
These
instructions
cover
the
description
,
operation
and
mainte
-
nance
of
Westinghouse
type
DH
-
P
Magnetic
"
De
-
Ion
"
Air
Circuit
breakers
.
These
breakers
are
applied
by
Westinghouse
as
a
rule
only
as
part
of
Porcel
-
line
Metal
Clad
Switchgear
.
The
available
ratings
are
shown
in
the
Rating
Table
on
page
56
.
These
instructions
are
written
so
as
to
be
easy
to
read
.
In
order
to
avoid
trouble
in
handling
,
operation
etc
,
PLEASE
READ
THE
INSTRUCTIONS
BEFORE
ATTEMPTING
ANY
OF
THESE
OPER
-
ATIONS
.
If
the
need
to
get
into
operation
is
especially
urgent
,
the
sec
-
tions
,
"
RECEIVING
,
HANDLING
,
STORING
"
and
"
BASIC
OPER
-
ATING
INSTRUCTIONS
"
can
be
read
first
and
the
remainder
stud
-
ied
later
.
Courtesy of NationalSwitchgear.com

7
The
13.8
KV
breakers
are
packed
in
3
separate
crates
for
one
complete
breaker
.
The
basic
breaker
unit
without
arc
chutes
or
barrier
,
is
in
one
crate
,
the
3
arc
chutes
are
together
in
another
crate
and
the
bar
-
rier
in
another
.
GENERAL
DESCRIPTION
Following
Westinghouse
practice
for
35
years
in
the
development
of
magnetic
air
breakers
,
the
DH
-
P
line
is
designed
for
horizontal
drawout
construction
.
Figure
1
shows
two
views
of
a
type
50
-
DH
-
P
75
breaker
.
The
arrangement
chosen
is
for
convenience
of
operation
,
must
be
reached
and
seen
in
the
routine
operation
of
the
breaker
are
easily
found
.
These
packing
methods
make
it
easy
for
inspection
before
final
assembly
and
placing
in
service
.
See
"
Maintenance
Guide
"
-
"
In
-
spection
,
Adjustments
and
Maintenance
"
.
Parts
which
The
front
of
the
breaker
chassis
carries
all
controls
ordinarily
needed
,
such
as
the
tripping
magnet
or
magnets
,
hand
tripping
trigger
,
closing
spring
release
magnet
and
spring
release
hand
trigger
for
the
stored
energy
mechanism
,
auxiliary
switches
,
sec
-
ondary
contact
controls
,
levering
device
,
etc
.
First
,
inspect
crates
for
any
signs
of
damage
or
rough
handling
.
You
should
use
a
nail
puller
to
open
the
crates
,
as
this
is
less
likely
to
cause
damage
to
the
apparatus
than
crow
bars
,
etc
.
There
will
usually
be
loose
parts
such
as
hardware
packed
in
the
crate
or
fastened
to
the
larger
parts
.
Be
careful
after
removal
of
crate
that
none
of
these
are
overlooked
.
The
DH
-
P
breakers
are
built
with
either
a
spring
operated
stored
energy
mechanism
or
a
conventional
d
.
c
.
solenoid
type
mech
-
anism
,
Both
are
mechanically
trip
free
.
The
mechanism
is
located
in
the
chassis
at
the
bottom
of
the
breaker
.
The
porcelain
pole
unit
supports
are
mounted
on
the
top
of
the
chassis
and
there
is
no
grounded
metal
higher
than
the
base
of
the
pole
unit
.
The
arc
chutes
are
hinged
to
the
top
of
the
pole
unit
directly
over
the
circuit
breaker
contacts
.
The
barrier
assembly
provides
gas
isolation
between
pole
units
and
to
the
cell
wall
where
necessary
.
A
grounded
metal
plate
in
front
forms
a
shield
from
live
.
parts
.
In
lifting
the
breaker
off
the
base
of
the
crate
keep
the
arc
chutes
off
because
you
might
damage
them
.
Use
a
spreader
over
the
top
of
the
breaker
and
attach
at
the
holes
on
the
breaker
ohassis
marked
"
Lift
Here
"
.
with
the
arc
chutes
in
place
.
Do
not
lift
breaker
at
any
time
After
the
breaker
is
out
of
the
crate
,
roll
it
on
its
own
wheels
only
if
the
floor
is
smooth
.
In
rolling
it
around
corners
,
use
the
handling
dolly
.
See
"
Basic
Oper
-
ating
Instructions
"
.
Handle
all
parts
carefully
but
be
es
-
pecially
careful
with
the
arc
chutes
.
Do
not
drop
them
or
bump
them
hard
either
before
or
after
removal
from
the
box
.
They
contain
a
porcelain
-
like
material
which
breaks
easier
than
metal
or
most
plastics
.
After
unpacking
,
inspect
immediately
before
further
handling
for
any
signs
of
damage
.
If
any
damage
is
found
,
file
a
claim
at
once
with
the
Transportation
Com
-
pany
and
notify
the
nearest
Westinghouse
Electric
Corporation
Sales
Office
.
RECEIVING
,
HANDLING
,
STORING
The
4.16
KV
type
DH
-
P
breakers
are
packed
all
in
one
crate
but
not
completely
assem
-
bled
.
The
basic
breaker
unit
,
assembled
complete
except
for
arc
chutes
and
main
barrier
,
is
in
one
section
of
the
crate
.
The
three
arc
chutes
,
each
in
a
carton
,
and
the
main
barrier
are
inside
the
same
crate
with
the
breaker
.
Courtesy of NationalSwitchgear.com

8
STORING
CONNECTION
.
BE
SURE
CONNECTION
IS TIGHT
AT
BOTH
ENDS
OF
SHUNT
.
TO LEAVE
CON
-
NECTION
LOOSE
WILL
CAUSE
DANGEROUS
FIREWORKS
.
It
is
best
to
examine
the
apparatus
im
-
mediately
after
receiving
for
any
signs
of
damage
,
to
clarify
damage
claims
.
During
storage
,
whether
packed
or
unpacked
,
keep
all
parts
in
a
clean
dry
place
,
warm
enough
and
with
enough
clean
air
circulation
to
prevent
condensation
of
moisture
.
This
apparatus
is insulated
for
high
voltage
and
it
must
be
protected
from
dirt
and
moisture
at
all
times
.
3
.
To
Install
13.8
KV
Arc
Chutes
:
The
13.8
KV
Arc
Chute
has
a
closed
hinge
pin
hole
.
Therefore
,
the
Arc
Chute
must
be
held
in
position
while the
hinge
pin
is
inserted
.
Figure
2
b
shows
the
recom
-
mended
method
of
installation
.
Because
of
its
weight
the
Arc
Chute
should
be
sus
-
pended
from
a
crane
or
chain block
.
Be
-
cause
of
the
length
of
the
hinge
pin
and
close
spacing
of
the
Arc
Chutes
,
the
center
pole
Arc
Chute
should be installed first
.
The
hinge
pin
must
be backed
into
an
ad
-
jacent
Arc
Chute
bracket
and
then
pushed
into
the
center
pole
,
with the
Arc
Chute
in
position
.
Be
sure
to
install
the retainers
on
the
hinge
pin
.
BASIC OPERATING
INSTRUCTIONS
READ
CAREFULLY
AND
LOOK
AT
BREAKER
BEFORE
TRYING
TO OPER
-
ATE
.
1
.
To
Lift
Breaker
:
CAUTION
:
Do
not
lift
breaker
with
arc
chutes
in
place
,
you
might
damage
them
.
BE
SURE
TO CONNECT
SHUNT
STRAP
FROM
LOWER
CONTACT
TO FRONT ARC
CHUTE
CONNECTION
.
NECTION
IS TIGHT
AT
BOTH
ENDS
OF
SHUNT
.
TO
LEAVE CONNECTION LOOSE
WILL
CAUSE
DANGEROUS
FIREWORKS
.
Place
crane
hooks
in
holes
in
chassis
marked
' '
Lift
Here
"
.
Be
sure
to
use
spreader
bar
over
top
of
breaker
to
pre
-
vent
damage
to
breaker
parts
.
BE
SURE
CON
-
2
.
To
Install
Arc
Chutes
,
4.16
KV
Breakers
:
4
.
To
Install
Main
Barrier
:
Hold
arc
chute
approximately
in
the
tilted
back
position
as
shown
in
Fig
.
2
a
.
Place
entrance
of
hinge
pin
slots
over
hinge
pin
.
Let
weight
of
chute
down
on
to
hinge
pin
and
tilt
forward
.
Hinge
pin
should
go
to
end
of
slots
in
arc
chutes
.
Tilt
chute
forward
to
normal
operating
position
.
Tilt
back
against
stop
for
inspection
.
Take
care
not to
drop
or
bump
arc
chute
unnecessarily
.
Place
barrier
assembly
on
breaker
with
steel
panel
at
front
and
insulating
sheets between
poles
of
breaker
.
Place
bolts
in
front
to
fasten front
steel
panel
to
front of
breaker
chassis
and
tighten
se
-
curely
.
Bolt
the tabs
or
lower
rear
corners
of
insulating
barriers
to
steel
brackets
on
rear
of
breaker
chassis
.
CONNECT
SHUNT
STRAP
FROM
LOWER CONTACT
TO
FRONT
ARC
CHUTE
USE
HANDLE
ON
FRONT
STEEL
PANEL
OF
BAR
-
RIER
ASSEMBLY
TO
Courtesy of NationalSwitchgear.com

9
(
c
)
Line
up
guide
channel
on
R
.
H
.
side
of
breaker
near
floor
,
with
guide
rail
on
R
.
H
.
side
of
cell
floor
.
PULL
OR
PUSH
BREAKER
STRAIGHT
FORWARD
OR
BACKWARD
.
HANDS OFF
TOP
EDGE
OF FRONT
BARRIER
IN
MOVING
BREAKER
.
KEEP
NOTE
:
Keep
hands
off
top
edge
of
front
steel
barrier
when
pushing
breaker
into
cell
.
5
.
To
Roll
Breaker Around
Corners
:
(
d
)
Push
breaker
into
cell until
yellow
rail
latch
at
front of
guide
channel
catches
in
notch
in
guide
rail
and
stops
further
movement
of
breaker
toward
rear
of
cell
.
For
general
movements
of
breaker
where
corners
must
be
turned
,
use
the
handling
dolly
.
Place vertical
pin
of
dolly
in
hole
in
handling
bracket
at
bottom
and
center
of
front
chassis
panel
by
tilting
dolly
handle
sharply
toward breaker
.
Turn
dolly
handle
downward until
front
wheels
of
breaker
lift
off
floor
.
Breaker
can now
be
steered
by
horizontal
movement
of
dolly
handle
.
7
.
To
Place
Breaker
in
Fully Energized
Position
:
CAUTION
:
The
pole
unit
parts
are
alive
at
full
circuit
voltage
when
the
breaker
is
in
the
fully
ener
-
gized
position
.
Before
moving
the
breaker
into
that
position
,
make
sure
arc
chutes
have
been
properly
installed and
that
main
barrier
assembly
has
been
properly
fastened
in
place
.
Failure
to
do
this
may
cause
serious
damage
or
injury
.
1
.
6
.
To
Place Breaker
in
First Position
in
Cell
:
This
is
called
the
TEST
POSITION
.
Mechanical
interlock
prevents
levering
break
-
er
in
or
out
if
breaker
is
in
closed
position
.
If
such
an
attempt
is
made
with
enough
force
,
3
/
16
pin
at
front of
levering
shaft
is
designed
to
shear
as a
safety
measure
,
to
prevent
dam
-
age
to
parts
harder
to
get
to
.
(
a
)
Press
down
on
rail
latch
on
breaker
,
see
Fig
.
3
.
2
.
NOTE
:
This
is
a
valuable
piece
of
equipment
.
PLEASE
HANDLE
IT
CAREFULLY
.
It
will
stand
some
abuse
but
,
like
any
other
similar
equipment
,
it
can
be
damaged
by
rough
handling
.
(
a
)
Examine
disconnecting
finger
clus
-
ters
for
any
signs
of
damage
.
See
that
they
are
properly
positioned
and
that
the
retaining
bolts
are
all
in
place
in
the end
of
the breaker
studs
.
Clean
off
any
dirt
,
DO
NOT
APPLY
GREASE
.
(
b
)
Push breaker toward
rear
of
cell
as
far
as
it
will
go
,
about
1
/
4
to
3
/
8
inch
.
Be
sure
it
is
pushed
until
it
is
stopped
.
This
should
require
only
a
few
pounds
of
push
.
It
brings
the
levering
nut
on
the breaker
up
to
the
screw
in
the
cell
.
paper
,
etc
.
(
b
)
Make
sure
that
the cell
is
clean
and
clear
of
anything
that
might
interfere
with
breaker travel
.
Make
sure
levering
screw
in
cell is clean
and
free from
dirt
or
grit
.
(
c
)
Engage
crank
on
levering
shaft
,
push
moderately
toward
rear
of
cell and
turn
crank
clockwise
,
move
slowly
toward
rear
of
cell
.
Breaker
should
After
Courtesy of NationalSwitchgear.com

1
0
levering
handle
,
which is
pivoted
immedi
-
ately
above the
"
T
"
handle
.
breaker
starts
to
move
it
is
not
necessary
to
push
.
(
b
)
Push
down
on
the curved end
of
the
levering
handle
as
far
as
it
will
go
.
This
adds
leverage
for
the
necessary
force
for
final
full
makeup
of
contacts
.
(
d
)
Continue
cranking
until crank
turns
freely
and
breaker
stops
moving
.
When
breaker is
fully
engaged
,
front
steel
bar
-
rier
should
be
about
1
/
4
inch
or
less
from
cell
frame
angles
.
To
Disengage
:
To
Withdraw
Breaker
from
Energized
Position
to
Test
Position
:
8
.
(
a
)
Lift
up
on
the
levering
handle
for
initial
break
of
contacts
.
CAUTION
:
See
Note
Under
(
6
)
.
(
b
)
Pull
"
T
"
handle
out
as
far
as
it
will
go
and
let
it
drop
to
the vertical
position
.
(
a
)
Engage
crank
on
levering
device
shaft
and
turn
counterclockwise until
crank
rotates
freely
.
OPERATION
OF
STORED ENERGY
MECHANISM
(
b
)
Pull
breaker
toward
front
of
cell
until
rail
latch
engages
slot
in
rail
.
Breaker
is
then
secured
in
test
position
.
1
.
With
breaker
in
cell
and
secondary
contacts
engaged
,
motor
normally charges
closing
spring
as soon as
control
voltage
is
applied
to
control circuit
.
9
.
To
Withdraw
Breaker
from
Cell
:
2
.
Normally
spring
is
charged
immedi
-
ately
after
each
closing
operation
.
(
a
)
Press
down
on
rail
latch
to
free
breaker
from
rail
.
3
.
Breaker is
closed
electrically
by
ap
-
plying
voltage
to
the
spring
release coil
,
marked
"
Lift
to
Close
"
,
through
the
con
-
trol
switch
.
(
b
)
Pull breaker
out
of
cell
.
NOTE
:
On
stored
energy
mechanisms
,
the
breaker
may
close and
open
as
it is
withdrawn
,
depending
on
whether
breaker
was
leftclosed
or
open
,
or
whether
spring
was
leftcharged
ordischarged
while stand
-
ing
in
the
test
position
.
This
is
to
discharge
closing
and
opening
springs
as
a
safety
measure
.
4
.
Breaker
is
tripped
electrically by
ap
-
plying voltage
to
the
trip
coil
,
marked
"
Lift
to
Trip
"
,
through
the
control switch
.
5
.
To
Charge
Closing
Spring by
Hand
(
See
Fig
.
5
)
:
(
a
)
Place
special
ratchet
wrench
on
hexagonal
end
of
crank
shaft
.
On
5
KV
breakers
this
projects
from
the
R
.
H
.
side
of
breaker chassis
.
On
15
KV
breakers
this
is
inside the chassis
panel
opening
,
to
the
left
of
the
maintenance
closing
handle
socket
.
(
b
)
Charge spring
with
several
down
-
ward
movements
of
ratchet
wrench
until
10
.
To
Engage
Secondary
Contacts
with
Breaker
in
Test
Position
(
See
Figs
.
4
a
and
4
b
)
:
(
a
)
Lift
"
T
"
handle
on
L
.
H
.
side
at
front of
chassis
to
a
horizontal
position
.
Lift
further
to
disengage
notch
in
rod
from
top
edge
of
panel
and
push
toward
rear
of
breaker
.
The small
horizontal
pin
in
"
T
"
handle
should
engage
the
2
slots
in
the
Courtesy of NationalSwitchgear.com

11
wrench
suddenly
turns
freely
and
a
"
click
"
is
heard
.
Do
not
attempt
to
ratchet
any
further
.
(
c
)
To
Open
Breaker
Contacts
Slowly
:
With
breaker
in
closed
position place
maintenance
closing
handle
in
socket and
press
down
with
a
force
about
equal
to
that
required
to
close
the
breaker
.
Hold
in
this
position
and
lift
"
TRIP
"
plunger
.
Then
let
up
slowly
on
handle
and
make desired ob
-
servations
.
6
.
To
Spring
Close
Breaker
without
Electric
Power
see
Fig
.
5
b
:
Place
finger
under
plunger
marked
"
Lift
to
Close
"
and
push
up
.
This releases
closing
latch and breaker closes
.
OPERATION OF
SOLENOID
MECHANISM
7
.
To
Open
Breaker
by
Hand
The
solenoid
mechanism
is
operated
in
the
same
manner
as
the
stored
energy
mechanism
except
that
there
is
no
closing
spring
.
The solenoid
magnet
closes the
breaker
directly
and
is
energized
through
the
"
X
"
relay
,
mounted
on
the
mechanism
front
panel
,
as
shown
in
Fig
.
12
.
Operation
with
maintenance
handle
is
the
same
as
for
stored
energy
mechanism
.
Place
finger
under
plunger
marked
"
Lift
to
Trip
"
and
push
up
.
8
.
To
Close
Breaker
by
Hand
with
Maintenance
Closing
Handle
:
CAUTION
:
Do
not
under
any
circumstances
try
to
close the
breaker
on
a
live
circuit
by
maintenance
hand
closing
socket
.
When
the
breaker
is
beyond
the
test
position
in
the cell
,
a
flag
covers
the
main
-
tenance
closing
socket
to
prevent
insertion
of
the handle
.
Don
’
t
force
flag
out
of
position
and
insert
handle
.
HOW
THE
BREAKER
WORKS
Operating
Mechanism
,
Stored
Energy
Type
The
spring
stored
energy
mechanism does
two
jobs
:
CAUTION
:
Always
remove
maintenance
handle
before
opening
the
breaker
by
the
tripping
trig
-
ger
.
Handle
is
not
trip
free
in
this
mode
of
op
-
eration
and
it
will
move
upward
fast
if
left
in
socket
while
breaker
is
tripped
.
(
a
)
The
socket
on
the
breaker
for
the
maintenance
closing
handle
is
accessible
through
the
opening
in
the chassis
panel
near
the
lower
R
.
H
.
corner
.
1
.
It
stores
energy
by
compressing
,
or
charging
,
a
spring
.
2
.
It
applies
the
released
energy
to
the
breaker
contact
system
to
close
the
con
-
tacts
and
charge
the
opening springs
.
Tripping
is
accomplished
in
a
conven
-
tional
manner
.
The
mechanism
may
rest
in
any
one
of
4
normal
conditions
as
follows
:
(
b
)
Breaker should be
closed
with
main
-
tenance
handle
only
when
closing
spring
is
discharged
,
push
down
until
breaker
latches
closed
.
Place
handle
in
socket and
1
.
Spring
not
charged
(
or
spring
dis
-
charged
)
and
breaker
open
.
2
.
Spring charged
and breaker
open
.
3
.
Spring
discharged
and
breaker closed
.
4
.
Spring charged
and
breaker
closed
.
CAUTION
:
Be
sure
to
remove
Maintenance
Closing
Handle
before
tripping
Breaker
.
Handle
is
not
Trip
Free
in
this
Mode
of
Operation
.
Courtesy of NationalSwitchgear.com

1 2
Figure
6
is
a
photograph
of
the
lower
side
of
a
stored
energy
mechanism
in
a
4.16
KV
breaker
.
The
13.8
KV
model
is
similar
but
the
breaker
frame
is
larger
.
The
major
component
is
a
single
-
throw
crankshaft
to
which
is
attached
a
ratchet
wheel
for
charging
the
spring
and
a
cam
for
closing
the
breaker
,
crankshaft
and
associated
parts
can
be
seen
.
details
are
also
shown
in
Fig
.
23
.
On
the
crankshaft
will
be
seen
a
connecting
rod
,
which
attaches
to
the
spring
to
compress
it
,
the
ratchet
wheel
and
the
closing
cam
,
both
of
which
rotate
together
with
the
crankshaft
.
Figures
8
a
,
-
b
,
-
c
and
-
d
show
the
4
conditions
of
the
closing
cam
and
tripping
linkage
.
Note
that
in
8
a
,
in
which
the
breaker
is
open
and
the
spring
not
charged
,
the
tripping
trigger
is
in
the
tripped
po
-
sition
.
As
the
spring
is
charged
,
the
trip
-
ping
trigger
snaps
into
the
fully
reset
po
-
sition
as
in
8
b
near
the
end
of
the
spring
charging
operation
.
Parts
of
the
The
crankshaft
sub
-
assembly
and
In
Fig
.
8
c
the
linkage
is
shown
in
the
breaker
closed
position
and
before
the
spring
has
been
recharged
.
Note
that
the
closing
cam
has
rotated
about
one
-
half
turn
,
corresponding
to
the
rotation
of
the
crankshaft
and
ratchet
wheel
of
Figs
.
7
a
and
7
b
.
Rotation
of
the
closing
cam
pushes
the
cam
roller
so
as
to
rotate
the
main
shaft
of
the
breaker
and
close
the
contacts
.
This
is
possible
because
the
restraining
links
between
the
cam
roller
and
the
trip
-
ping
cam
prevent
the
roller
from
moving
off
to
the
right
.
The
restraining
links
cause
the
tripping
cam
to
push
against
the
tripping
latch
,
which
pushes
downward
,
on
the
left
end
,
on
top
of
the
tripping
trigger
.
Figure
8
d
shows
the
breaker
in
the
closed
position
after
the
spring
has
been
recharged
.
Note
that
the
closing
cam
has
rotated
about
one
-
half
turn
.
The
cam
for
this
portion
of
the
travel
is
cylindrical
and
causes
no
further
movement
of
the
closing
cam
fol
-
lower
roller
.
This
rotation
corresponds
to
the
spring
charging
rotation
of
the
ratchet
wheel
shown
in
Figs
.
7
a
and
7
b
.
Figures
7
a
and
7
b
are
schematic
views
of
a
section
of
the
mechanism
as
would
be
seen
from
the
R
.
H
.
side
of
the
breaker
with
the
breaker
in
the
normal
position
with
re
-
spect
to
the
cell
.
The
driving
pawl
runs
by
continuous
rotation
of
the
driving
motor
until
charging
is
complete
,
as
is
shown
.
The
holding
pawl
holds
the
ratchet
wheel
during
the
back
travel
of
driving
pawl
.
The
closing
spring
is
held
compressed
by
the
spring
release
latch
and
in
turn
by
the
spring
release
trigger
.
It
will
be
seen
that
rotation
of
the
ratchet
wheel
is
counter
-
clockwise
and
that
the
connecting
rod
is
slightly
over
horizontal
dead
center
with
the
spring
fully
charged
.
It
stops
at
that
point
because
the
ratchet
roller
bumps
against
the
spring
release
latch
.
You
can
hear
this
at
the
end
of
the
charging
op
-
eration
.
When
the
spring
release
trigger
,
extending
out
from
the
mechanism
panel
,
is
released
by
lifting
the
arm
either
by
hand
or
electrically
,
the
ratched
roller
is
freed
and
the
crankshaft
,
ratchet
wheel
and
cam
rotate
rapidly
counterclockwise
for
about
one
-
half
turn
as
shown
in
Fig
.
7
b
.
This
closes
the
breaker
.
The
motor
limit
switch
is
closed
by
this
operation
and
the
spring
is
immediately
charged
again
back
to
the
position
in
Fig
.
7
a
.
Lifting
the
tripping
trigger
arm
either
by
hand
or
by
the
tripping
magnet
causes
release
of
the
tripping
latch
,
tripping
cam
and
closing
-
cam
follower
roller
,
which
opens
the
breaker
and
the
linkage
moves
to
the
position
shown
in
Fig
.
8
b
.
ANTI
-
CLOSE
INTERLOCK
An
anti
-
close
interlock
is
provided
to
pre
-
vent
attempted
closing
of
the
breaker
after
it
has
already
been
closed
.
If
such
an
at
-
Courtesy of NationalSwitchgear.com

1
3
tempt
is
made
without
the
interlock
the
breaker
will
open
and
close
as
long
as
the
spring
release
trigger
is
lifted
.
As
shown
in
Fig
.
7
a
the
anti
-
close
inter
-
lock
presses
down
on
the
spring
release
latch
while
the
breaker
is
closed
.
Under
this
condition
there
should
be
a
clearance
of
.
010
to
.
060
inches
between
the
front
spring
release
latch
roller
and
the
top
of
the
spring
release
trigger
.
If
the
spring
release
trigger
is
lifted
as
in
an
attempt
at
closing
under
this
condition
it
will
simply
rise
and
no
operation
will
occur
,
and
it
will
reset
when
released
.
These
movements
are
made
possible
by
virtue
of
the
restraining
link
connecting
the
lower
and
upper
closing
links
to
the
tripping
cam
.
The
tripping
cam
is
held
back
by
the
tripping
latch
and
tripping
trig
-
ger
.
Lifting
the
tripping
trigger
allows
the
tripping
latch
to
be
pushed
away
by
the
tripping
cam
.
The
restraining
link
no
longer
restrains
the
closing
links
,
which
jack
-
knife
out
to
the
right
,
allowing
the
pole
unit
levers
to
rotate
downward
and
open
the
breaker
.
The
linkage
is
now
in
the
position
shown
in
Fig
.
10
b
.
It
will
be
noted
that
the
upper
extension
of
the
closing
latch
has
been
pushed
to
the
right
by
the
closing
link
pin
.
It
thus
no
longer
holds
the
closing
core
in
position
.
The
retrieving
spring
then
pulls
the
closing
core
to
the
left
.
Since
the
breaker
is
now
open
,
this
core
movement
resets
the
tripping
cam
,
tripping
latch
and
trip
-
ping
trigger
to
the
position
shown
in
Fig
.
10
c
.
The
mechanism
is
now
ready
to
close
again
.
OPERATING
MECHANISM
,
D
.
C
.
SOLENOID
TYPE
Figure
9
a
is
a
photograph
of
the
bottom
of
a
4.16
KV
breaker
with
a
d
.
c
.
solenoid
mechanism
.
Figure
9
b
shows
the
same
view
of
al
3.8
KV
solenoid
operated
breaker
.
With
the
exception
of
being
especially
com
-
pact
these
mechanisms
are
of
conventional
design
.
They
consist
essentially
of
d
.
c
.
magnets
and
mechanically
trip
free
link
-
ages
,
meaning
that
the
breaker
contacts
are
always
tripped
free
of
the
closing
core
.
Thus
the
breaker
will
always
open
even
though
the
closing
core
may
remain
ener
-
gized
and
in
its
closed
position
.
CHASSIS
Figure
11
a
is
a
photograph
of
a
4.16
KV
breaker
chassis
with
stored
energy
mech
-
anism
.
side
of
a
13.8
KV
chassis
.
The
extensive
use
of
the
same
parts
in
the
two
ratings
is
evident
.
Figure
12
shows
the
chassis
of
a
4.16
KV
solenoid
operated
breaker
.
Major
parts
are
named
.
Figure
lib
shows
the
opposite
Figures
10
a
,
b
and
c
are
schematic
drawings
of
the
solenoid
mechanism
link
-
age
,
which
are
basically
the
same
for
all
breaker
ratings
.
The
dark
circles
are
stationary
pin
centers
with
respect
to
the
mechanism
frame
.
Figure
10
a
shows
the
linkage
in
the
normal
closed
and
latched
position
.
The
closing
core
has
moved
to
the
right
,
to
the
limit
of
its
travel
,
where
it
bumps
into
the
stationary
core
.
The
core
pulls
the
core
links
,
which
in
turn
swing
the
guide
link
about
its
stationary
center
.
This
gives
a
generally
upward
motion
to
the
lower
and
upper
closing
links
and
in
turn
to
the
pole
unit
lever
turning
it
to
the
breaker
closed
position
.
LEVERING
DEVICE
AND
BREAKER
INTERLOCK
Figures
13
a
and
b
show
the
two
extreme
positions
of
the
levering
device
.
The
main
parts
of
the
device
are
:
1
.
The
nut
.
2
.
The
guide
tube
.
3
.
The
levering
shaft
.
Courtesy of NationalSwitchgear.com

14
securely
on
the
rear
of
the
front
panel
,
which
can
enter
an
elongated
keyway
in
the
front
part
of
the
levering
-
in
shaft
.
The
key
is
spring
-
operated
by
the
closing
and
opening
movement
of
the
breaker
contact
linkage
.
When
the
breaker
is
in
the
CLOSED
POSITION
,
a
force
is
applied
through
a
single
-
leaf
spring
to
the
key
,
to
make
it
enter
the
keyway
on
the
levering
-
in
shaft
.
The
levering
-
in
shaft
may
be
left
in
any
position
so
that
the
keyway
may
not
line
up
with
the
key
.
However
,
since
the
key
is
pressing
against
the
shaft
,
it
will
snap
into
the
keyway
on
the
first
rotation
of
the
shaft
as
the
keyway
comes
into
line
with
the
key
.
These
are
a
part
of
the
chassis
assembly
.
The
nut
is
fastened
securely
to
the
guide
tube
and
is
housed
in
a
casting
fastened
to
the
extreme
rear
of
the
chassis
as
shown
in
Fig
.
14
.
The
basic
operation
is
for
the
nut
to
turn
onto
the
screw
which
is
mounted
on
the
rear
wall
of
the
cell
.
Since
the
nut
is
securely
fastened
to
the
chassis
,
it
pulls
the
breaker
into
the
final
energized
position
.
The
guide
tube
is
slotted
lengthwise
for
a
distance
about
equal
to
the
travel
of
the
breaker
.
The
levering
shaft
has
2
rec
-
tangular
hardened
keys
welded
to
it
which
slide
in
the
guide
tube
slot
.
Thus
,
as
the
levering
shaft
is
rotated
,
the
guide
tube
and
nut
are
also
rotated
.
As
the
nut
conse
-
Thus
,
the
levering
-
in
shaft
cannot
be
rotated
any
further
and
no
more
movement
of
the
breaker
can
occur
as
long
as
it
is
in
the
closed
position
.
quently
moves
on
the
screw
,
BY
CLOCK
-
WISE
ROTATION
,
the
screw
extends
farther
and
farther
toward
the
front
of
the
breaker
,
pushing
the
levering
shaft
with
it
.
Conse
-
quently
the
levering
shaft
stands
still
rela
-
tive
to
the
screw
and
other
cell
parts
,
in
-
cluding
the
door
.
Thus
,
the
end
of
the
lever
-
ing
shaft
is
always
the
same
distance
be
-
hind
the
door
,
whether
the
breaker
is
in
the
test
or
energized
position
,
or
in
between
.
If
you
try
to
turn
the
levering
-
in
shaft
as
hard
as
possible
while
the
breaker
is
closed
,
the
levering
-
in
shaft
pin
,
where
the
levering
-
in
crank
is
attached
,
will
be
broken
.
This
protects
the
internal
parts
of
the
interlock
against
mechanical
damage
and
prevents
unintentional
withdrawing
or
insertion
of
the
braker
while
it
is
closed
,
which
is
very
dangerous
.
As
the
breaker
is
continued
to
be
levered
in
,
the
keys
on
the
levering
shaft
move
toward
the
end
of
the
guide
tube
slot
.
As
the
rear
key
comes
out
of
the
slot
,
the
levering
shaft
turns
freely
and
the
breaker
moves
no
further
.
The
end
of
the
guide
tube
is
shaped
like
a
steep
-
pitch
one
-
turn
screw
thread
so
that
when
the
levering
shaft
is
rotated
counterclockwise
,
the
rear
key
will
catch
and
enter
the
slot
,
and
rotate
the
guide
tube
and
nut
,
and
the
breaker
will
be
withdrawn
.
If
the
pin
is
broken
it
should
become
clear
that
the
breaker
must
be
opened
be
-
fore
it
is
withdrawn
and
the
broken
pin
must
be
replaced
.
For
further
operating
details
,
see
BASIC
OPERATING
INSTRUCTIONS
.
FLOOR
INTERLOCK
AND
OPERATING
LEVERS
The
breaker
interlock
is
designed
to
prevent
moving
the
breaker
into
or
out
of
the
energized
position
if
the
breaker
con
-
tacts
are
in
the
closed
position
.
It
con
-
sists
essentially
of
a
movable
key
,
mounted
Another
job
of
the
breaker
interlocking
system
is
to
prevent
closing
of
the
breaker
while
the
breaker
is
being
levered
into
or
out
of
the
energized
position
.
Courtesy of NationalSwitchgear.com

>
15
t
i
Figs
.
la
.
&
lb
.
Views
Showing
General
Arrangement
of
Type
50
-
DH
-
P
75
Circuit
Breaker
k
Courtesy of NationalSwitchgear.com

16
Fig
.
2
a
.
Installing
Arc
Chute
of
Type
50
-
DH
-
P
75
Breaker
Courtesy of NationalSwitchgear.com

17
>
*
Fig
.
2
b
.
Installing
Arc
Chute
of
Type
150
-
DH
-
P
500
Breaker
Courtesy of NationalSwitchgear.com

#
18
w
»
Fig
.
2
c
.
y
4
rc
Chute
of
Type
50
-
DH
-
P
250
in
Place
on
Breaker
Courtesy of NationalSwitchgear.com

1 9
Fig
.
5
a
.
Charging
Closing
Spring
by
Hand
,
4.15
KV
Breaker
Figs
.
4
a
.
,
4
b
.
Operation
of
Secondary
Contacts
with
Breaker
in
Test
Position
Courtesy of NationalSwitchgear.com

2 0
4
Fig
.
5
b
.
Spring
Closing
Breaker
by
Hand
Release
,
4.16
KV
Breaker
Courtesy of NationalSwitchgear.com