GE AKR-30S Manual page 11

Type AKR breakers, both for
stationary and substructure
draw out mounted designs
are available, and are UL­
Iisted to ANSI C37. 1 6 stand­
ards. The substructure is the
equipment mounted compo­
nent of a closed-door draw
out breaker unit. Serving as
the stationary receptacle, it
provides means for mount­
ing and connecting (both
primary and secondary) the
draw out breaker (removable
element). The basic sub­
structure is a self-contained ,
factory-al igned frame-work
designed for convenient
mounting as individual
breaker compartments of
switchboard or switchgear
equipments. In conjunction
with a l ine of accessories,
10
it offers the equipment
builder all the mechanical
and electrical components
necessary to outfit a com­
partment for closed-door
draw out AKR breakers.
All AKR substructure
breakers (draw out mounting
type "D" for AKR-30 and -50
and type " F" for AKR-75
and 1 00) are equipped with
extended ("deep") escut­
cheons. This configuration
allows the breaker to be
racked between the CON­
N ECTED, TEST, and DIS­
CON NECT positions without
the need to open the com­
partment door.
On all frame sizes the
draw out mechanism is
breaker mounted. The rack-
ing handle is inserted
through the breaker escut­
cheon on AKR-30 and -50,
and through the compart­
ment door on the AKR-30S,
-75, and -1 00. As the rack out
handle is turned, it rotates
slotted racking arms or cams
on each side of the breaker
frame. The cams engage
fixed pins mounted on both
sides of the substructure,
moving the breaker in
and out.
The draw out operation
features four positions. In
the CON N ECTED position
the primary and secondary
disconnects are fully
engaged. The breaker must
be opened before it can be
racked in or out of this posi-
tion . When in the TEST posi­
tion, the primary disconnects
are disengaged, but the
secondary disconnects
remain engaged. This per­
mits breaker operation with­
out energizing the primary
circuit. In the DISCON N ECT
position neither primary nor
secondary disconnects are
engaged. Breakers may be
racked between these three
positions with the compart­
ment door closed. Each
position is clearly identified
by markings which appear
on the left side of the escut­
cheon as it emerges through
the door cut out. With the
door open, the breaker can
be pulled out manually from
the disconnected position.