I.
B.
694C694-02
these bolts permits the replacement of the moving con-
tacts (Figures 5-2, 5-3 and 5-4).
To change the fixed arcing and main contacts, the fixed
contact assembly must first be removed from the pole
unit Remove the rear mounted disconnect finger con-
tacts (Figure 3-1). Remove the screws holding the con-
tact assembly to the pole unit base and withdraw the
contact assembly.
Reassemble a new contact assembly
in
the pole unit
with the holding screws finger tight. Close the circuit
breaker and check "A" dimensions. The "A" dimensions
Dimension A
I .020 Minimum Both Sides
Breaker Closed
These Faces
Parallel
Breaker Closed
Figure 5-1 DS//-308 Contacts
and
Adjustments
Effective
07
/97
Page
47
should be approximately equal. If not, trip the breaker
and adjust the fixed contact system until alignment is
obtained. Tighten the screws and contacts as described
in
Paragraph 5-5.2.
5-4.5 ARC CHUTES
The V-shaped slots
in
the arc chutes will undergo slow
erosion with arc interruptions. Switching operations will
give them a pitted, mottled and sooty appearance. This
is normal. Heavy fault interruptions will cause a greater
amount of erosion.
Dimension C
0.42
± .08
Breaker Open
D
0
Breaker Open
Courtesy of NationalSwitchgear.com
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