5
SECTION 3. BREAKER PREPARATION
The following steps are performed to prepare the
breaker for installation of the new conversion kit.
Unless otherwise indicated, the procedure is the
same for both LA-800 and LA-1600 breakers.
WARNING:
Before installing the conversion kit, turn
the breaker OFF, disconnect it from all voltage
sources, and discharge the closing springs.
1.
Open the breaker and remove it from its enclo-
sure. Carefully place the breaker on a suitable
work surface so that the rear of the breaker is
initially accessible.
2.
If the conversion kit is to be installed on a fused
breaker (LAF series), remove the fuse structure
from the upper (line) studs to allow easier access
to the load studs.
3.
Loosen the two Allen-head screws securing each
of the primary disconnects to the line (upper) and
load (lower) studs and remove the primary
disconnects, as illustrated in Figure 1.
4.
Remove the wires from the original current sen-
sors (CTs), if present, and slide off the CTs.
5.
Unscrew the knob on the end of the manual
charging handle and pull the handle down part
way. Remove the two bolts holding the escutch-
eon to the breaker frame and lift off the
escutcheon.
6.
Carefully position the breaker so that it is resting
on its back on the line and load studs.
7.
Remove the two bolts securing the old flux
shifter mounting bracket (if present) to the
breaker frame, shown in Figure 2. One bolt is
secured with a nut, the other is attached to a
tapped hole in the frame. Disconnect the two
connectors on the leads to the trip unit and
remove the flux shifter.
8.
Remove the three bolts securing the trip unit
mounting bracket (if present) to the breaker
frame. Remove the trip unit and its wiring har-
ness.
Figure 1. Primary disconnects removed from the lower studs,
showing the original current sensors (LA-1600 shown).
Figure 2. Original flux shifter and trip unit (Type LTS1 shown)
mounting locations (LA-1600 shown).
Trip Unit
Flux
Shifter
