Rockwell Automation 140U Q, M frame CB Electronic RMS Trip Unit installation and operation - Manual (Page 5)

Page 5
Contact
Base
Right
Contact
Base
Fig. 7 Left- and Right-Pole Contact Bases
Circuit Latch
Breaker
Handle
Side Trip Side
Plate Unit Plate
Retaining
Screws
Position trip unit in base. Make sure latch bracket pin is
properly seated in slots in side plates (see Fig. 8). If
necessary, move latch toward load end of circuit breaker
to seat trip unit.
Screw in and tighten three trip unit retaining screws
to 12 Ib-ft (16.27 (see Fig. 8).
A
CAUTION
DO NOT EXCEED A TORQUE OF 12 LB-FT
(16.27 n.m.) EXCESSIVE TORQUING WILL SHEAR
SCREWS.
FAILURE TO APPLY THE REQUIRED TORQUE MAY
LEADTO EXCESSIVE HEATING AND CAUSE
NUISANCE TRIPPING OF THE CIRCUIT BREAKER.
For an M-Frame, also screw in and torque the load end
screws to 6-8 Ib-ft. (8.14-10.85
3.4 3-Pole (Non-Ground Unit Installation
Remove trip unit outer pole screws and red plastic
washers from the breaker frame. Discard red plastic
washers (fig. 7). For the M-Frame, also remove the load
end trip unit mounting screws from the frame
(fig. 7a).
NOTE: The two trip unit outer retaining screws may
be placed in the trip unit conductor holes at this time.
If preferred, the 5/16 inch hexagonal-head wrench may
be used to position the screws when the trip unit is in
the base.
Position trip unit in base. Make sure latch bracket pin is
properly seated in slots in side plates (see Fig. 8). If
necessary, move latch toward load end of circuit breaker
to seat trip unit.
Screw in and tighten three trip unit retaining screws
to 12 Ib-ft (16.27 (see Fig. 8).
CAUTION
Fig. 8 Trip Unit Installed in Circuit Breaker
Note: The two trip unit outer retaining screws may be
placed in the trip unit conductor holes at this time. If
preferred, the 5/16 inch hexagonal-head wrench may
be used
to position the screws when the trip unit is in
the base.
DO NOT EXCEED A TORQUE OF 12 LB-FT
(16.27 EXCESSIVE TORQUING WILL SHEAR
SCREWS.
FAILURE TO APPLY THE REQUIRED TORQUE MAY
LEADTO EXCESSIVE HEATING AND CAUSE
NUISANCE TRIPPING OF THE CIRCUIT BREAKER.
40752-072(2) Effective 6/02