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GEK-731O,
Power Circuit Breokers
closing spring
has
to
be
charged
by hand.
The
closing solenoid
is
an optiona-l
accessory and
is
not
supplied unless
specified in the breaker order.
ELECIRICAL CTOSING
Applying control power immediately
energizes
the closing motor on electrical
breakers.
Cutoff
of
the
motor
circuit
does
not
occur
until
a-fter the
spring is completely
charged and
overcenter.
The
spring is
mechanically held from discharging until
the closing
circuit
activates a solenoid which
re-
leases the holding latch.
Apush-button closing switch may
be
provided
on
electricalbreakers.
This
feature, however, is pro-
vided only
ifspecified in
the
breaker
order. If
sup-
plied, it
is located
inthe right
side
of
the escutcheon.
When
in
service,
all
electrical
breakers
are
closed
either by energizing the closing
circuit re-
motely, or
at
the breaker location by
operation of
the
push
button switch
in the
escutcheon
(if
ttre
breaker
is
so equipped).
OPENING
THE BREAKER
A
closed breaker
will
open
(trip)
whenever
the
trip
latch
(11),
Fig.
12,
is
moved
off the
roller
on
the secondary
latch
(14).
A number of
trip
paddles
are
mounted
on
the
trip
shaft,
one
for
each
tripping
device.
INTERTOCKS
Some
interlock
devices
are required by Industry
Standards
and Certifying Authorities; others
are
optional
and intended only
for
special applications.
The standard
interlock
devices
described
in the
fol-
Iowing paragraphs are used only on drawout
break-
ers.
Stationary breakers have
no
required inter-
locks.
cLoSrNG
SPRTNG INTERTOCK
(F|GS.
6A AND
68)
Closing spring interlocks help
to
provide pro-
tection against the hazard
of
a
completety
charged
and
overcenter spring being accidentally released
after the breaker
has been
withdrawn from
its
en-
closure.
Drawout
breakers have
their
ciosing
springs
fully
charged
prior to
closing
and
thus
re-
quire this
sa-fety
feature.
Figure 6A
shows
how
the interlock is
activated
by the
racking mechalism. As racking arm
(1)
approaches
the
"disconnect" position,
crank
(2),
10
Fig.
6A.
(227A8290) Closi.ng spri.ng
interlock
\-
10
a\
t\
\'\
f..
I
I
'l
l.
Racking
Arrn
2.
Crank
3.
Le:'er
4.
Spring Release Lever
5.
Closing Solenoid
6. Roller
on
Ratchet
7.
Closing Spring
8.
Adjustable Link
9.
Blocking Plate
10. Sliding
Cover
Fig.
68.
(22748289) Blocking
plate
through connecting linkage,
causes
lever
(B)
to
ro-
tate
clockwise, actingagainst the closingspring
re-
lease
lever
(4).
This
is
the
same
lever which
is
operated
by the closing solenoid
(5).
When the
closing spring
is
automatically dis-
charged
by the
interlock,
it
does
not
cause
the
breaker
to close.
The contact arms remain mo-
tionless
because
the mechanism
is
held
"trip-free"
by plate (9), Fig. 68,
which
blocks the return
of
the
sliding cover
(10)
to its normal position
unless
\ri
/-
"l
a\^.
.rm
\ \N
\\l
It\ tl
12
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