GE AKR Series User Manual

Power Circuit
Breokers,
GEI-86134
MAINTENANCE
MANUAT
SUPPLEMENT
AKR-30H.
Same as
the
AKR-30
except for
modifi-
cauons
ln rne rollowlng
areas:
a.
Arc
quenchers.
b.
Closing
springs.
c.
Extra
insulation
on
sha-ft flyweights.
d.
Mounts one
additional
stationary main
contact
for
a
total
of
four:
otherwise
the
contact struc-
ture is
same as
AKR-30.
See Fie.
6.
NOTE:
To
uisibly disti.ngtdslt i,t
ft,ont
tlte
AKR-30,
tlte clositzg springs and at,c
qttencher
couers
of
tlte 30H are colored
red.
LOW.VOLTAGE
POWER CIRCUIT BREAKERS
TYPES AKR/AKRU.3OI50, AKRT.sO PER TABLE
I
INTRODUCTION
The data in this supplement
pertains
to
the new
800A
AKR-30 and
the
2000A
AKRT-5O
f rame
oreakers not coveredby the
existing
AKR/AKRU-50
maintenance manual
(publication
GEK-7310).
In-
formation
on
the
new
ECS and SST solid-state
trip
devices
also is included.
The
new
breaker models
are
derivatives
of
the
1600A frame AKR-50 design.
Apart f rom the
spe-
c i-f ic const ructional di-f
f
e
rence
s identi-f ied bel
ow,
the
basic AKR-50 framework,
mechanism
and accessory
devices
are substantially
common
to all versions.
Except
for the
800A
frame
primary
stud
details,
the
external
Hx W xD dimensions
are identical.
Accordingly,
a majority
of the
AKR-50
in-formation
now
in
publication
GEK-7310 applies
equally to the
new types.
Therefore, to
avoidneedless repetition,
the
scope
of this supplement
is
confined
principally
to that
descriptive
and instructional material
unique
to the
new models.
Unless
noted
to the contrary,
or otherwise discussed
herein,
the user
should
continue to
employ
GEK-73i0 as
the
general.
op-
erational
information source.
Complementing
the
above
"new"
material,
this
supplernent
includes
additional
information to
ex-
pand
and update
existing
GEK-7310
subject-matter
where
appropriate.
Examples
are revision
of the
operating
handle
adjustment
procedure
and reduc-
tion
of the AKRU-5O
minimum
fuse
size from 8004.
to 450A.
CONSTRUCTIONAL
DIFFERENCES
The
features
which distinguish
the
new
AKR/
AKRT
breakersfromthe
parent
AKR-50
frame
size
are
listed
below.
For
a
detailed
parts
comparison,
refer to
"Renewal
Parts Bulletin"
GEF-452?.
AKR-30.
a.
An
entirely
new contact structure.
Each
pole
employs three
stationary mains, two
stationary
arcingand onemovablecontact
arm. See Fig.
5.
Primary studs
carry four disconnect fingers
per
poie.
See Fig. 1.
Two
additional opening springs,
one
at
each end
of
the
main shaft.
See Fig. 4.
b.
c.
Fig, 1.
Rea?'
uiew
of
AKR-50
breaker

GE AKR Series Specifications

General

Brand	GE
Model	AKR Series
Category	Circuit breakers
Language	English