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IOW-VOLTAGE
POWER CIRCUIT
BREAKERS
TypEs
AKR-3/3A-so AND
AKRU_3
/ga-so
GENERAT DESCRIPTION
GENERAT
Low-voltagepower
circuit
breakers are
used
for
controlling andprotecting power
circuits inthe
low-
voltage
range (usually
up
to
600
volts).
In servins
this function, they are
a means
of safely switchin[
loads and
automatically clearing
circuits
when ab-
normal conditions
occur.
Among
these conditions,
the
more common are short
circuits
and sustained
overloads
and
undervoltages.
The
proper use,
care,
and maintenance
of these
breakers
is
a prime safety
consideration
for
the
protection
of
personnel, as
wellas
a means
of
mini_
mizing equipment
damage when
faults
occur.
per-
sons who apply, use, and
service
these breakers
will
acquire the
knowledge they
need
by gaining
the
information contained in these instructions.
BREAKER TYPES
Ali
of
the subject breakers are of the
"quick_
make, quick-break" descripiion, having the feature
of storing energy in
a
closing spring
for
quick
re_
lease
in closing.
In
closing, some energy
is trans-
ferred to
an opening
spring to
be used
sJbsequenilv
for
fast tripping.
hdividual breakers may vary
in
how
they
are
morrnted,
how
they
operate, how they
are
applied
and
in other
categories as shown
in Table
L.
Fig.
1.
(8041849)
AKR-50 Manual breaker
IABTT I
Fig.
2
(804t9i9) AKRU-S1
Electrically
operated
breaker
Drawout
Stationary
Manual,
Fig. I
Quick-close
Electrical,
Fig.
Type
of
Overcurrent
Trip
Device
These inslruclions
do
nol pvrport
lo
covsr
oll
dcloils
or
voriolions
in
egurpmenl
nor
lo
p.rovide
for
everyposible
conlinge
ncy
lo
be
mel
in
connection
wilh instollotion'
operdlion
or
moinlenonce. should
furlher
informolion
bi
iesired
o,
tno[ii'pirtirutor
pioblams
arise
which ore nol
covered
sufficienlly
for
lhe
purchoser's
purposes, rhe
moner shourd
6e referrd
ri
rhe
c.^irilii".tr;"-t;;;;r:"
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