1.8. 33-790-11
Page 37
Section 6 - Circuit Breaker Pole Units, Description and Oper-
ation
6.0 GENERAL
Figures 33, 34, 35, and 36 show detailed three pole
assemblies
of
all
of
the type DS circuit breakers.
DS206 has the three poles mounted on a single molded
base
of
high strength insulating material, with the contact
parts and sensors mounted
on
it.
Figures 37 and 38
show front and rear views
of
the assembly.
The DS416, DS420, DS632 and DS840 differ
in
that
each
of
the three poles are mounted on individual insulat-
ing bases, and all three poles held
in
accurate alignment
by
a welded steel frame. Front and rear views
of
each are
shown
in
Figures 39 and 40 for the DS416, Figures
41
and 42 for the DS420, Figures 43 and 44 for the DS632,
Figures 45 and 46 for the DS840.
6.1
MOVING CONTACT SUB-ASSEMBLIES
The moving contact members
of
all ratings consist
of
blades hinged at the bottom to the lower main terminal
through controlled pressure rotating contacts and with
main and arcing contacts at the upper end. The arcing
contacts
of
all
of
the five ratings shown are essentially
the same design. The number
of
blades, the size
of
the
main terminals and the number
of
fingers
in
the main dis-
connecting contacts vary with the rating. The DS206 has
two moving blades, the DS416 and DS420, four moving
blades, and the DS632 and DS840, eight moving blades.
On the DS206, two butt type main contacts and a knife
1.
Pole Units - One Pole Only
Shown
5.
Lower Main Terminal
9.
Main
Contact
2.
Rigid Welded Frame 6. Upper Main Terminal
10. Moving
Contact
Assembly
3. Molded 3-Pole Base
7.
Stationary
Contact
Assambly
11.
Insulating Link Rod
End
4.
Sensor
8. Arcing
Contact
12.
Moving Contact Pivot
Effective October 1998
Courtesy of NationalSwitchgear.com
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