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36
Installation
PowlVac
®
STD Vacuum Circuit Breaker
IB-60201
f. Turning the racking handle clockwise
will begin to rack the circuit breaker
into the compartment (Figure 19).
When the circuit breaker is racked into
the compartment, the force needed
to rotate the racking handle will be
low at the beginning of motion as the
movement of the racking crank arms
is only opening the shutters. Once
the shutters are open, the circuit
breaker begins to move toward the
stationary primary disconnecting
devices. When the movable primary
disconnecting devices of the circuit
breaker engage with the stationary
primary disconnecting devices of the
compartment, the force required to
rotate the racking handle will increase
appreciably. This force will decrease
as the primary disconnecting devices
spread and engage fully. Continuing
rotation of the racking handle will cause
the circuit breaker to travel further into
the compartment ensuring wipe or
overlap of the primary disconnecting
devices. Continue racking until the
breaker position indicator displays
“BREAKER CONNECTED”
. This
will be approximately 22 rotations
from the starting point. When the
circuit breaker reaches the end of the
racking travel, the user will notice
an increased amount of force. If the
operator continues to apply force, a
torque limiter on the racking handle
will produce a sharp clicking sound
indicating the torque limit is reached at
35-ft-lb. Should the operator continue
to apply force, the torque limiter will
continue to operate with no further
buildup of torque on the circuit breaker
racking mechanism.
Figure 19 Through Door Racking Option
g. Once the circuit breaker has reached the
connected position remove the racking
handle from the racking drive shaft
extension bar and rotate the teardrop
closed.
h. Open the compartment door and
remove the racking drive shaft
extension bar and verify that the
manual trip operator has returned to its
normal position.
i. Close the compartment door, and
operate the circuit breaker as required.
Note:
This is the Connected Position