GE AKR-30 Series Maintenance Manual page 172

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
equ ipped with features which make them easy to instal l i n
o r withdraw from their associated switchgear equipment.
These features are a racking mechanism (which facilitates
inserting and withdrawing the breaker u n it) and prim ary
and control power disconnects which connect and part
automatically. I nterlocking devices are i ncl uded.
Stationary breakers are desig ned 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 m iddle
digit in the breaker's nameplate desig nation as follows :
�
AKA-5 ( 0
Mounti ng type code letter per Table 2
MOUNTING TYPE CODES
TABLE 2
Code
Drawout
Letter
AKD-5
A
AKD-6
B
Substructure
D AKD-8
Substructure
--
s
FIG. 5 - CERAMIC ARC CH UTES
8
Breaker Type
Stationary
-
-
-
-
X
-
2 .5 TRIP DEVICE
There are several types of soli d-state, direct-acting, self­
powered trip device systems associated with AKA
breakers. These systems are for AC applications only.
For DC appl ications an electro-mechanical system is
avai lable.
The trip device system is identified by the first m iddle
digit i n the breaker nameplate designation as follows:
Trip device code number per Table 3
TABLE 3 TRIP DEVICE CODES
CODE N U MBER TRIP DEVICE
2
EC
Power Sensor1
3
4
EC
SST
5
MicroVersaTrip
6
RMS-9
7
MVT- PLUS or
9
MVT-PM
1
For Power Sensor devices. See publications
for detailed servicing proced ures.
G EK-7301
2.6 MODEL N U M B E R
Type AKA breakers (see Table 2 ) exist a s either n o model
number or "- 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
tai ner, see Fig . 6 .
All AKATSOH breakers use only molded arc chutes.
FIG. 6 - MOLDED A R C CHU T ES
APPLICATION
DC
AC
S
AC
AC
AC
AC
AC
G E K-7309
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and