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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
c h a r g e d
(
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
.
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