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IB-65100
Equipment Description
e)
Control
Circuit
The control scheme of any particular
circuit breaker may differ depending
on the user’s requirements, operating
solenoids, and the control devices
furnished with that circuit breaker.
Circuit breaker mounted auxiliary
contacts not used in the control
circuit are brought out for control and
indication functions. The metal-clad
switchgear equipment may provide
a circuit breaker MOC (Mechanism
Operated Cell Switch) for additional
contacts.
C.
R
ACKING
M
ECHANISM
1)
General
Description
The levering in device is the mechanical
assembly that facilitates moving the circuit
breaker between the test/disconnect and
the connected positions in the circuit
breaker compartment. The main racking
mechanism is located in the switchgear.
The main levering in device components
for the PowlVac ASD circuit breakers are
described in the following sections:
a) Interlocks
PowlVac ASD circuit breakers are
provided with several interlocks that
operate in conjunction with the circuit
breaker cell to ensure the proper
operation of the circuit breaker. Do
NOT attempt to modify or bypass these
interlocks, as they are necessary for the
safe operation of the circuit breaker.
The following describes the test plug
interlocking for the PowlVac ASD circuit
breakers:
a. Insert circuit breaker into the
test/disconnect position of the
circuit breaker compartment.
b. Insert the male side of the test
plug jumper (Figure 11, c) into
the compartment mounted test
umbilical receptacle (Figure 11, b).
c. Lift the test plug interlock device
(Figure 11, a).
d. While the interlock device is in the
up position, insert the female end of
the test plug jumper (Figure 11, d)
into the circuit breaker test plug
receptacle (Figure 1, e) locking the
circuit breaker in the
“Test/Disconnect” position,.
e. Lock the test plug disconnect latch
(Figure 11, e) to the left.
f. To remove circuit breaker, reverse
steps a through e.
