GE AKR-3-50 Maintenance Manual page 3

LOW
-
VOLTAGE POWER CIRCUIT BREAKERS
TYPES AKR
-
3
/
3 A
-
50 AND AKRU
-
3
/
3 A
-
50
GENERAL DESCRIPTION
GENERAL
Low
-
voltage
power circuit breakers
are
used for
controlling and protecting
power circuits in the low
-
voltage
range ( usually up
to
600 volts
)
.
In
serving
this function
,
they
are a means of safely switching
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
well
as
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
All of the subject breakers
are
of the '
'
quick
-
make
,
quick
-
break " description
,
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 subsequently
for fast tripping
.
Fig
.
1
.
( 8041849 )
AKR
-
50 Manual breaker
Individual breakers
may vary
in
how
they
are
mounted
,
how they
operate
,
how they
are
applied
and in other categories
as
shown in Table
1
.
TABLE 1
Drawout
Stationary
Mounting
Manual
,
Fig
.
1
Quick
-
close Electrical
,
Fig
.
2
Operation
3
»
Type of
Overcurrent
Trip Device
Power Sensor
AC
Application
Fused Breakers
Fig
.
2
( 8041919 )
AKRU
-
50 Electrically operated
breaker
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 General Electric Company
.
3