SECTION 7-Breaker Maintenance (Cont.)
7.1 4.1
BUFFER ADJUSTMENT
Referring to Fig. 40, with the breaker closed and the
mechanism not reset, a
.005 "
min. clearance must exist
between the end plate assembly and the buffer nut as
shown. This dimension is factory set. It can be reset by
tightening the buffer nut.
Hold the nut with a
screwdriver and tighten using a socket on the bolt head
opposite the nut. When tightening this assembly don't
over compress the neoprene washers by overtightening
the assembly. These washers absorb the breaker open
ing shock.
Referring to Fig. 41 , with the breaker open, a .040"
maximum clearance can exist between either of the end
plate assemblies and the buffer bolt heads as shown. If
a larger clearance exists, close it up by unscrewing the
buffer assembly involved.
Fig. 42 shows a buffer assembly prior to being installed
in a breaker. The dimensions given establish the number of
spacers that are used.
7.1 5 TRIP LATCH ADJUSTMENT
The reset position of the trip latch is set by the adjust·
ment screw shown in Fig. 43. The adjustment is correct if
three and one-half turns of the adjustment screw causes a
closed breaker to trip. If this check is made, the screw must
then be set back, or unscrewed, three and one-half turns.
NEOPRENE WASHERS
1 .93
FIG. 42
-
BUFFE R ASSEMBLY
FIG.
43
-
TRIP
LATCH ADJUSTMENT
32
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