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Installation
PowlVac
®
STD Vacuum Circuit Breaker
IB-60201
Figure 15 Pushing Manual Trip Operator &
Accessing Racking Drive Shaft
c. Turning the racking handle clockwise
will begin to rack the circuit breaker
into the compartment (Figure 16).
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 o 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.
d. Once the circuit breaker has reached
the connected position, remove the
racking handle, verify that the manual
trip operator has returned to its normal
position, close the compartment door,
and operate the circuit breaker as
required.
Note:
This is the Connected Position.
Figure 16 Racking the Standard Circuit Breaker
a
a. Racking Handle
