Page 40
The moving arcing contact thus wedges the stationary
contact fingers apart as the breaker closes.
The parallel action
of
the magnetic fields
of
the currents
in
each arcing contact finger causes the fingers to be
attracted toward each other when closing against fault
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currents. This results
in
a "blow-on" action on the arcing
contacts.
Figures 37 thru 46 show the combined moving and sta-
tionary contact sub-assemblies
of
the various breakers.
This shows the proper relationships, clearances and con-
tact deflections
of
the various parts.
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Fig.
36 Three Pole Assembly
of
DS-840 Pole Units on Frame
Effective October 1998
Courtesy of NationalSwitchgear.com
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