Vehicle Description
6
Secondary Contacts
The breaker control wiring is arranged for drawout dis-
connection by means of an 18-point connector plug ar-
ranged to connect to a mating receptacle mounted in rear
of the cell (Figure 3). The secondary connector plug is
mounted on a moveable bracket on the lower left hand
side of the breaker frame. This permits it to be extended
to the rear while the breaker is in the test position, and to
make contact with the stationary receptacle so that the
control circuits are completed. Sufficient clearance is pro-
vided in the mounting of both plug and receptacle, and
two large tapered pins on the plug provide positive align-
ment. The secondary contacts of the plug are made from
high conductivity copper alloy and are slotted to provide a
spring action which insures a good electrical contact. The
flexible control wires are soldered to each plug and are
arranged in a loop to allow free movement of the contact
slide.
Figure 3. Secondary Contacts
Ground Contact
A ground contact is located at the left rear of the breaker
from directly above the 18-point secondary plug, (Figure
3). Six spring loaded floating contact fingers engage the
ground contact at the rear of the cell and insure a low im-
pedance path to the ground.
Mechanism Operated Control Switch (5kV model only)
Some installations require more auxiliary switch contacts
than are available on the nine pole auxiliary switch on the
breaker. For this purpose additional rotary switches are
mounted in the cell and are mechanically linked to the
breaker mechanism.
An operating arm, shown in (Figure 3), on the right hand
side of the breaker frame is connected to the auxiliary con-
tact block and moves with the mechanism. The knob at
the end of the arm engages a link in the cell to operate the
additional switches.
