Advertisement
Power Circuit
Breakers ,
GEI
-
86134
MAINTENANCE MANUAL SUPPLEMENT
LOW
-
VOLTAGE POWER CIRCUIT BREAKERS
TYPES AKR
/
AKRU
-
30
/
50
,
AKRT
-
50 PER TABLE 1
INTRODUCTION
The data in this supplement pertains
to
the
new
80 OA AKR
-
30
and
the
2000 A AKRT
-
50 frame
breakers notcovered by the existing AKR
/
AKRU
-
50
maintenance manual
( publication GEK
-
7310 A )
.
In
-
formation on
the
new
ECS and SST solid
-
state
trip
devices also is included
.
AKR
-
30 H
.
Same
as
the
AKR
-
30 except
for modifi
-
cations in the
following
areas :
a
.
Arc quenchers
.
b
.
Closing springs
.
The
new
breaker models
are
derivatives of the
1600 A frame AKR
-
50
design
.
Apart from the
spe
-
cific constructional differences identified below
,
the
basic
AKR
-
50 framework
,
mechanism and accessory
devices
are
substantially
common to
all versions
.
Except for the
800 A frame
primary stud
details
,
the external H
x
W
x
D dimensions
are
identical
.
Accordingly
,
a
majority
of the AKR
-
50 information
now
in publication GEK
-
7310 A
applies equally
to
the
new
types
.
Therefore
,
to
avoid needless
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
-
7310 A
as
the general
,
op
-
erational information
source
.
c
.
Extra
insulation
on
shaft flyweights
.
d
.
Mounts
one
additional stationary main
contact
for a total of four ; otherwise the
contact struc
-
ture
is
same as
AKR
-
30
.
See
Fig
.
6
.
NOTE
:
To visibly distinguish it from the
AKR
- 30
,
the closing
springs
and arc
quencher
covers
of the 30 H
are
colored
red
.
Complementing the
above
''
new
"
material
,
this
supplement includes
additional information
to
ex
-
pand
and update existing GEK
-
7310 A
subject
-
matter
where appropriate
.
Examples
are
revision of the
operating
handle
adjustment procedure
and reduc
-
tion of the AKRU
-
50
minimum fuse size from
800 A
to 450
A
.
CONSTRUCTIONAL DIFFERENCES
The features which distinguish the
new AKR
/
AKRT breakers from the parent AKR
-
50
frame size
are
listed below
.
For
a
detailed
parts
comparison
,
refer
to
'
'
Renewal Parts Bulletin
"
GEF
-
4527
.
js
YQ
tir
*
*
Iril
-
4
*
s
£
•
'
*
1
AKR
-
30
.
&
a
.
An entirely new
contact structure
.
Each
pole
employs three stationary mains
,
two
stationary
arcing
and
one
movable
contact arm
.
See
Fig
.
5
.
b
.
Primary studs carry four disconnect fingers per
pole
.
See Fig
.
1
.
c
.
Two additional opening springs
,
one at
each end
of the main shaft
.
See
Fig
.
4
.
Fig
.
1
.
Rear view
of
AKR
-
30
breaker
3
Advertisement
