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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
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