Instruction Book
Page 34
Effective: May 2016
For more information visit:
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IB131017EN
5-3 LINEAR ACTUATOR MECHANISM
WARNING
KEEP HANDS AND FINGERS AWAY FROM THE
BREAKER'S INTERNAL PARTS WHILE THE BREAK-
ER CONTACTS ARE CLOSED. OPEN THE CIRCUIT
BREAKER BEFORE PERFORMING ANY
MAINTENANCE, INSPECTIONS OR REPAIR. DO NOT
TRY TO REMOVE THE CAPACITORS UNLESS THE
CAPACITORS ARE FULLY DISCHARGED.
Interior components of the linear actuator mechanism can
be easily accessed by removing the four cover bolts
securing the breaker's front cover (Figures
3-9
and
5-2
).
The circuit breaker must be in the open position to
remove the front cover.
The linear actuator mechanism is comprised primarily of
the linear actuator, the controller and three closing
capacitors (Figure
5-2
). The mechanism allows for a
circuit breaker OOCO duty cycle. Once the capacitors
discharge to accomplish the close action, they
immediately begin to recharge which takes approximately
15 seconds.
5-3.1 MANUAL OPERATION
While the circuit breaker powered on, it can be manually
closed and opened through the use of the front mounted
green "ON" and red "OFF" pushbuttons (Figure 5-5). In the
event that control power is lost, the circuit breaker is
capable of performing a manual OPEN operation up to 48
hours after the loss of control power. If the control power
loss lasts longer than 48 hours, the circuit breaker can be
opened utilizing the integral "EMERGENCY OPEN" handle
located on the front of the circuit breaker. (Figure 5-5). The
circuit breaker is manually opened by inserting one finger
in the recess behind the "EMERGENCY OPEN" handle,
grasping firmly and pulling down to open the circuit
breaker.
5-3.2 ELECTRICAL OPERATION
While the circuit breaker is powered on, it can be
electrically closed and opened. In the event that control
power is lost, the circuit breaker is capable of performing
an electrical OPEN operation up to 48 hours after the loss
of control power. The linear actuator circuit breaker does
not accept an exterior voltage source to open or close the
circuit breaker. A dry contact must be used to open or
close the circuit breaker remotely. An optional undervolt
age release device is available and mounted separately
from the circuit breaker.
Figure 5-5 Manual Operation Features
5-3.3 TRIP FREE OPERATION
When the emergency open handle is pulled, any attempt
to close the circuit breaker will be prevented.
5-3.4 ANTI-PUMP FEATURE
All circuit breakers have a standard anti-pump feature. If
the circuit breaker is open, it only accepts one attempt to
re-close when the close command continues
uninterrupted.
