Page 2
Functional Description
An
E
aton AQB-L400 Adapter Kit provides the means for
converting the normally male configured primary
connections of an AQB-L400/LL400 current limiting
circuit breaker to female configured primary connections,
normally associated with an AQB-LF400 circuit breaker
(Figure 1-5). A close out plate, attached directly to the
front of the AQB-L400 circuit breaker with four mounting
screws, provides the deadfront cover required to com
plete the conversion.
The adapter kit itself is comprised of line and load side
adapter blocks, six female spring loaded primary connec
tion adapters, a close out plate, and four mounting
screws (Figure 1-3).
PART 2. INSTALLATION/OPERATION
a. Turn off all power.
b. Remove LF400 breaker, if applicable.
c. The standard male type slip connectors shall be
removed from the AQB-L400/LL400 circuit breaker.
The threaded end of the female connection adapters
attaches in their place. The other end of the female
connection adapters provides the female slip con
nections required for the AQB-LF400 configuration.
d. Mount the tulips to the line and load ends.
1. Note that 4 tulips are offset mounted on their
pads and 2 tulips are centered (Figure 1-4).
2. The centered tulip assemblies mount to the cen
ter pole.
3. Offset tulip assemblies mount to the left and right
poles, with the tulips oriented to the outside of
the breaker.
4. Before tightening the hardware, check the align
ment using the adapter block as a template.
5. If the alignment is correct, tighten the hardware.
I.L. 15578A
A
CAUTION
TO PROPERLY REMOVE THE ADAPTED AQB-L400/
LL400 CIRCUIT BREAKER, UNSCREW THE BOLTS
LOCATED IN THE ADAP TER BLOCK, NOT THE
BREAKER MOUNTING BOLTS LOCATED IN THE
BREAKER FRAME.
e. The adapter block is mounted to the circuit breaker
using breaker mounting bolts.
f. The modified breaker is mounted to the LF400
mounting blocks using hardware supplied with the
adapter block.
g. After mounting the breaker on the LF400 block,
attach the close out plate to the front. Once attached
to the front of the AQB-L400/LL400 circuit breaker
with four mounting screws, the close out plate
insures a deadfront installation. In addition, the close
out plate provides front access to the circuit breaker's
operating handle, trip unit adjustments, lower breaker
mounting bolts and megger holes. Access to the
adapter block mounting bolts, however, requires
removal of the close out plate.
h. Since the
E
aton Adapter Kit applied to an AQBL400/
LL400 breaker is a direct replacement for an already
installed AQB-LF400 breaker, modifications to the
existing bus mounting system are not required. An
already adapted AQB-L400/LL400 breaker can be
mounted on existing blocks, and secured in place
with the provided upper and lower adapter block
bolts (Figure 1-6).
Fig. 1-4. Closeup of Tulips Showing Center and Offset
Mountings
Effective October 1997
I.L. 15578A
Fig. 1-5. Rear View of Navy Type AQB-L400 Circuit
Breaker and Adapter Kit Combination Display
ing Female Configured Primary Connections
Effective October 1997
Page3
Fig. 1-6. Navy Type AQB-L400 Circuit Breaker and
Adapter Kit Combination Plugged Into Male
Mounting Blocks
In general, follow the mounting procedures normally used
for mounting any AQB-LF400 circuit breaker, when
installing the AQB-L400/LL400 circuit breaker and
Adapter Kit combination. Follow the instructions and pro
cedures provided with the AQB-L400/LL400 circuit
breaker when operating the AQBL400/LL400 and
Adapter Kit combination. Refer to Technical Manual
1240C33H01
PART 3. REPLACEABLE PARTS
a. L400/LL400 plus Adapter Kit: See
E
aton
b. Adapter Kit: 6590C82G01
c. LF400 Mounting Block: 6590C82G03
