SECTION 2-General Description {Cont.)
2.4 MOUNTING
Type AKA breakers are designed for either drawout or
stationary mounting. Drawout breakers (See Fig.
4)
are
equipped with features which make them easy to install in
or withdraw from their associated switchgear equipment.
These features are a racking mechanism (which facilitates
inserting and withdrawing the breaker unit) and primary
and control power disconnects which connect and part
automatically. Interlocking devices are included.
Stationary breakers are designed to be mounted on a
framework or panel, with mechanical fasteners being used
to secure the breaker frame and make power connections.
If control power connections are needed, a suitable termi
nal board is supplied.
The mounting type is identified by the second middle
digit in the breaker's nameplate designation as follows:
8
AKA-5 (�0
Mounting type code letter per Table
2
Code
TABLE 2 MOUNTING TYPE CODES
Breaker Type
Letter
Drawout
Stationary
A
B
D
s
AKD-5
AKD-6
Substructure
AKD-8
Substructure
--
"1
-
-I
1ct
s
!413-lirl
-
-
-
-
X
FIG.
5
-
CERAMIC ARC CHUTES
2.5 TRIP DEVICE
There are
4
types of solid-state, direct-acting, self
powered trip device systems associated with AKA break
ers. These systems are for AC applications only. For DC
applications an electro-mechanical system is available.
The trip device system is identified by the first middle
digit in the breaker's nameplate designation as follows:
Trip device code number per Table 3
CODE
TABLE
3
TRIP DEVICE CODES
TRIP
NUMBER
DEVICE
APPLICATION
2
EC
DC
3
Power Sensor'
AC
4
ECS
AC
5
SST
AC
6
MicroVersa Trip
AC
'Power Sensor devices are discontinued. See publications
GEK-7309 and GEK-7301 for detailed servicing procedures
2.6 MODEL NUMBER
Type AKA breakers (see Table
2)
exist
as
either no model
number
of
"-1" versions. For example AKA-5A-30H
or
AKA-5A-30H-1.
The difference between these models is their arc chute
construction. The arc chutes in the no model number break
ers have a two piece porcelain frame and use
2
arc chute
retainers, see Fig. 5. The "-1" breaker arc chutes have a
one
piece molded polyester glass frame and 1 arc chute re
tainer, see Fig. 6.
All AKRTSOH breakers use only molded arc chutes.
.__.: _
_
. .
;""·���·
;.,r ..
.........__
__ _
I er-:3
..4 II t,q PI
FIG. 6 - MOLDED ARC CHUTES
' -
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