Breaker Ratings - GE AKR Series Maintenance Manual Supplement

GEI-86134, Power Circuit Breokers
AKR-5OH.
An AKR-50
with
extended short circuit
?ffiEs
attaine$-by special
arc
quenchers, closing
springs and
added
insulation.
euencher tops
and
closing springs currry the same
red color
used
on
the AKR-30H.
AKRT-50. A
20004 extension
of
the
1600A
frame
AEF-:$;-
M
o
dif
i
cations
ar
e :
a.
New and
larger
upper stud assembly,
movable
contact
arms
and
pivot block.
b.
Stationary main contacts increased
from
6
to g;
otherwise the stationary
contacts are
identicai
to the
AKR-50.
See
Figs. g
and 9.
BREAKER RATINGS
AKR
breakers a.reavailable inthree frame sizes
--
800,
1600
and
2000
amperes.
These values re_
present the maximum continuous current capability
of the respective
frames.
However,
each
breaker
carries
a
specificrating whichis
determined by the
current.sensor
€rmpere
rating(or
tap
setting) of
tt"
trip
device
with which
it
is
equipped.
EXAMPLE: An
AKR-5A-3O
breaker with
SST
sensor tap set on 1004 is
rated
100A.
Short cir cuit ratings vary
with
the applied system
voltage.. OTZ
!
V systems they are atso
Oependent
upon
whether the overcurrent
trip
device contains
an instantaneous trip element.
See
lante
Z.
TABI.T 2
BREAKTR
RAIIIIGS
Frame
Size
(Amperes)
Breal<er
Type
Rated
Maximum
Voltage
(60H2 ac)
3{
Short
Circuit
Rating
(kA RMS Sym)
with
Instantaneous
Trip
Without
Instantaneous
Trip
800
AKR-30
635
508
254
30
30
42
30
30
30
AKR-3OH
635
508
254
42
42
50
42
42
42
1600
AKR-50
635
508
254
42
50
65
42
50
50
AKR-5OH
635
508
254
50
65
65
50
65
65
2000
AKRT.SO
635
508
254
42
50
65
42
50
50
800
AKRU-30
600
200
200
1600
AKRU
-50
600
200
200