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60
PowlVac® ASD 27kV & 38kV Vacuum Circuit Breaker
IB-65100
Recommended Renewal Parts and Replacement Procedures
8) Latch Check Switch
The latch check switch is located on the left
side of the main mechanism frame, near the
bottom of the main closing spring
(Figure 7, c).
CAUTION
CAUTION
!
Ensure that the control circuits are
deenergized and the circuit breaker is
deenergized, disconnected by means of a
visible break, and securely grounded. Do NOT
start to work on a closed circuit breaker or a
circuit breaker with the main closing spring
charged.
Perform the following steps to replace the
latch check switch assembly:
a. Remove front cover of the circuit
breaker.
b. Remove two screws holding switch
to mechanism. Do not loosen the
nut plate into which these screws are
threaded.
c. Disconnect wires from the switch.
d. Connect the wires to the new switch
and fasten switch in place with screws
and nut plate previously removed.
e. Adjust the switch. To adjust the switch
see
Ch 5 Maintenance,
B. M
ECHANISM
A
REA
, 5) Mechanism Adjustments,
d. Latch Check Switch Adjustment.
f. Operate circuit breaker electrically
several times to ensure the switch
functions properly.
g. Replace the front cover.
9) Motor Cutoff Switch Assembly
The motor cutoff switch assembly is located
on the floor pan of the mechanism area just
right of the main mechanism (Figure 7, t).
CAUTION
CAUTION
!
Ensure that the control circuits are
deenergized and the circuit breaker is
deenergized, disconnected by means of a
visible break, and securely grounded. Do NOT
start to work on a closed circuit breaker or a
circuit breaker with the main closing spring
charged.
Perform the following steps to replace the
motor cutoff switch assembly:
a. Remove the front cover of the circuit
breaker.
b. Disconnect the wires from the motor
cutoff switch assembly, being careful to
note which wires go to which terminal.
c. Remove the two bolts holding the
assembly to the circuit breaker floor pan
and remove the assembly.
d. Install the new cutoff switch assembly
by bolting it to the floor pan. Reconnect
the wiring and no adjustments are
needed at this time.
e. Operate the circuit breaker electrically
several times to ensure the switch
functions properly.
f. Replace the front cover.
