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Automatic spring-charging check
The automatic spring-charging features of the
circuit breaker must be checked. Control
power is required for automatic spring
charging to take place.
Note: A temporary source of control power
and test leads may be required if the control-
power source has not been connected to the
circuit breaker. Refer to the specific wiring
information and rating label for your circuit
breaker to determine the voltage required
and where the control-voltage signal should
be applied. When control power is connected
to the circuit breaker, the closing spring
should automatically charge.
1. Close the control power disconnect device
to energize the circuit breaker control
circuit. If not previously charged, the
closing spring should charge
automatically.
2. Use the manual close and open controls
on the circuit breaker operating
mechanism (refer to Figure 1: Operator
panel controls of circuit breaker and
manual charging of closing spring on
page 8) to first close and then open the
circuit breaker contacts. Verify contact
positions visually by observing the OPEN/
CLOSED indicator on the circuit breaker.
3. In step 2, when the close pushbutton was
pressed, the circuit breaker should have
closed, and the closing spring should have
recharged automatically.
4. De-energize control power by opening the
control power disconnect.
Hazardous voltage and high-speed moving parts.
Will cause death, serious injury and property damage.
Read instruction manuals, observe safety instructions and use qualified
personnel.
5. Perform the spring-discharge check.
A. Press red Trip pushbutton.
B. Press black Close pushbutton.
C. Press red Trip pushbutton again.
D. Verify spring-condition indicator shows
DISCHARGED.
E. Verify main contact status indicator shows
OPEN.
Final mechanical inspections without
control power
1. Make a final mechanical inspection of the
circuit breaker. Verify the contacts are in
the open position, and the closing spring
is discharged.
2. Verify mechanical condition of springs.
3. Check for loose hardware.
7
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