Breaker Ratings - GE AKR-4-30 Maintenance Manual Supplement

GEI-86134, Power Circuit Breakers
ratings attained by special arc quenchers, closing
springs and added insulation. Quencher tops and
closing springs carry the same red color used on
the AKR-30H.
a. and larger upper stud assembly, movable
New
contact arms and pivot block.
b. Stationary main contacts increased from 6 to 8;
otherwise the stationary contacts are identical
to the AKR - 50. See Figs. 8 and 9.
Frame
Size
(A mperes)
1600
2000
1600
4

BREAKER RATINGS

Rated
Maximum
Breaker
Volt age
Type
(60Hz ac)
635
AKR-30 508
254
800
63 5
AKR-30H 508
254
635
AKR-50 508
254
635
AKR-50H 508
254
635
AKRT-50 508
25 4
800 AKRU-30 600
AKRU -50 600
BREAKER RATINGS
AKR breakers are available in three 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 specific rating which is determined by the
current sensor ampere rating (or tap setting) of the
trip device with which it is equipped.
EXAMPLE: An AKR-5A-30 breaker with SST
sensor tap set on 100A is rated 100A .
Short circuit ratings vary with the applied system
voltage. On 240 V systems they are also dependent
upon whether the overcurrent trip device contains
an instantaneous trip element. See Table 2.
TABLE 2
3 q, Short Circuit Rating
(kA RMS Sym)
With
Instantaneous Instantaneous
Trip
30
30
42
42
42
50
42
50
65
50
65
65
42
50
65
200
200
Without
Trip
30
30
30
42
42
42
42
50
50
50
65
65
42
50
50
200
200