13
Installing the Current Sensors
The current sensors must be installed differently in
the two breaker frame sizes.
LA-800 Current Sensors
The following procedure is illustrated in Figure 16.
1.
Slide two of the current sensors (CTs) over the
outer load studs with their terminals pointing
upward. Slide the other CT over the center line
stud with its terminals pointing downward.
2.
Connect the CT leads from the trip unit to each of
the CTs. The leads are labeled with the letter of
the corresponding pole (A is the right pole from
rear of the breaker, B is the center pole, C is the
left pole), and are also cut to the appropriate
lengths. Attach the white wire to the terminal
marked with a white paint dot on the A and C
(outer) CTs. Attach the black wire to the terminal
marked with a white paint dot on the B (center)
CT. This difference is necessary to maintain
proper polarity.
3.
Reattach the primary disconnect assemblies to all
the studs if the breaker is unfused or to only the
load (lower) studs if the breaker is fused.
4.
If the breaker is fused, reinstall the fuse assem-
blies on the upper studs.
LA-1600 Current Sensors
The following procedure is illustrated in Figure 17.
1.
Slide the three current sensors (CTs) over the
lower (load) studs, with the terminals pointing
up.
2.
Connect the CT leads from the trip unit to each of
the CTs. The leads are labeled with the letter of
the corresponding pole (A is the right pole from
rear of the breaker, B is the center pole, C is the
left pole), and are also cut to the appropriate
lengths. Attach the white wire to the terminal
marked with a white paint dot.
3.
Reattach the primary disconnect assemblies to all
the studs if the breaker is unfused or to only the
load (lower) studs if the breaker is fused.
4.
If the breaker is fused, reinstall the fuse assem-
blies on the upper studs.
Figure 16. Installing the current sensors (LA-800).
Figure 17. Installing the current sensors (LA-1600).
CT Wire Exit
Hole
CT Wire Exit
Hole
