GE Industrial Solutions MicroVersaTrip Plus and MicroVersaTrip PM for Allis Chalmers, Siemens_Allis, and Siemens LA-600[F] and LA-1600[F] (Blue) - Manual (Page 4)

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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-600 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 enclosure. 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 shown in
Figure 1.
4. Remove the wires from the original current sensors (CTs), if
present, and slide off the CTs.
5. Lift out the arc chutes and phase barriers and set them aside
for later reinstallation.
6. Loosen the handle-mounting set screw, shown in Figure 2,
then lift the handle out. Remove the four screws holding the
escutcheon to the breaker frame and lift off the escutcheon.
7. Carefully position the breaker so that it is resting on its back
on the line and load studs.
Figure 1. Primary disconnects removed from the lower studs,
showing the original current sensors.
Figure 2. Escutcheon mounting screws.
Mounting
Screws
Handle Set
Screw