SECTION 7-Breaker Maintenance (Cont.)
7.14.1 B U FFER ADJUSTMENT
Referring to Fig. 40, with the breaker closed and the
m echanism not reset, a .005" clearance m ust exist be
tween the end plate assem bly and the buffer nut as shown.
This dimension is factory set. It can be reset by tightening
the buffer n ut. Hold the nut with a screwdriver and tighten
using a socket on the bolt head opposite the nut. When
tightening this assem bly don't over com press the neo
prene washers by overtightening the assembly. These
washers absorb the breaker o pening shock.
Referri ng to Fig. 41 , with the breaker open, a .040 "
m ax i m u m c learance can exi st between either of the end
plate assemblies and the buffer bolt heads as shown. If
a larger c learance exi sts, 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, ttiree and one-half turns.
NEOPRENE WASHERS
WASHERS
1
.93
FIG. 42 - BUFFER ASSEMBLY
FIG . 43 - TRIP LATCH ADJ USTMENT
32
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