9
Installing the Trip Unit Mounting Bracket
The new ProTrip trip unit mounts to the left side of
the front channel. A mounting bracket is shock--
mounted to a plate that is assembled to the front
channel.
EC or Power Sensor Trip System
1. The holes for the new mounting plate may have
to be added to the front channel. The drill pattern
is shown in Figure 11, with a full-size template in
the Appendix. Tap the holes for 1/4-20 screws.
2. Attach the new mounting plate, as shown in
Figure 12, with two short 1/4-20 screws and lock
washers on the top and the single long 1/4-20
screw and lock washer on the bottom. Be sure to
insert the spacer between the mounting plate and
the breaker channel, as shown.
3. Attach the trip unit mounting bracket to the plate
with two screws, lock washers, and flat washers,
as shown in Figure 13.
ECS or SST Trip System
Remove the existing mounting plate and bracket.
Install the new mounting plate and bracket, using the
holes closest to the front of the breaker, as described
in steps 2 and 3 above.
If the manual indicator assembly busing on AK-50
manual breakers interferes with the mounting
bracket installation, then the bracket must be modi-
fied. Cut off a 3/4 x 11/2 inch section from the right
front of the plate to provide clearance.
Figure 11. Mounting hole drill pattern for the trip unit mounting
plate.
Figure 12. Trip unit mounting plate attached to the breaker front
channel.