Drawout Breaker Interchangeability - GE AKR-4-30 Maintenance Manual Supplement

DRAWOUT BREAKER
INTERCHANGEABILITY
In general, drawout breakers of the same type
and rating are interchangeable in their equipment
compartments; drawout breakers of different frame
sizes are not interchangeable. To prevent inserting
the wrong type breaker into a drawout compartment,
suitable "rejection hardware" is affixed to each
breaker and its compartment.
typical rejection bracket which aligns with a re­
jection pin in the drawout rail (Fig. 3). When the
wrong type breaker is inserted into a compartment
the bracket and pin do not mate, preventing the
breaker from seating itself into the drawout rails.
There is one exception to the above. Breakers
of the same frame size having different short cir­
cuit ratings may be interchanged in one direction
only:
AKR-30
CD
AKR-30H
®
f-
z
w
o:: Z
��---
<to
a_O::
�"-
0
u
0
AKRU-30
0
Fig. 2. Non-interchangeability (rejection)
hardware arrangements in drawout
com partments for breaker Types
AKR-30j30Hj50j50H, AKRT-50 and
AKRU-30/50
Figure 4 shows a
c
B
A
AKR-50
0
REJECTION
PINS IN
SLIDE
RAILS
REJECTION
BRACKETS
MOUNTED ON
BREAK E R
)
C
REJECTION
PIN
B
MOUNTING
POSITIONS
A
AKRU-50
®
Power Circuit Breakers, GEI-86134
a. An AKR-30H can be inserted into an AKR-30
compartment.
b. An AKR-50H can be inserted into an AKR-50
compartment.
The rejection hardware prevents the conver.se of
a. and b.
Figure 2 shows the rejection pin and bracket
combinations employed. As determined by its in­
tended breaker type, each drawout compartment has
its rejection pin (or pins) installed in one of three
positions (A, B or C front-to-rear) along the slide
rail(s). Referring to Views 2 and 5, note that only
the AKR-30H and 50H types employ two pins, one in
each slide rail. The other breaker types use a
single pin in the right side rail. AKRU-30 and 50
fused breakers use a single bracket, whereas all
nonfused breakers carry two brackets. Use Fig. 2
as a guide for determining the proper breaker
type(s) that will be accepted by any given compart­
ment.
- PLAN VIEWS -
AKRT-50
(!)
COMPARTMENT
RIGHT SIDE
Slide rail rejection pin locations
Fig. 3.
FRONT OF
PIN
5