5.2.1 ALTERNATE CONTROL CIRCUIT
Later production breakers use the electrical control
circuit shown in Fig. 9A for all control voltages except
250
volts D.C. which uses the circuit shown in Fig. 9.
This alternate control circuit eliminates the X-relay and
CC switch shown in Fig. 9.
The motor is energized through the 'G' cutoff switch
and the K-relay contact. The motor is deenergized when
the 'G' cutoff switch changes state which occurs when
the closing spring is fully charged.
With the closing spring propped fully-charged, the
breaker is ready for closing. This may
be
accomplished
electrically by depressing the closing switch on the
REMOTE
CLOSE
-1 �-.,
t �PS
TC
breaker (if so equipped) or by a remote closing switch.
Operation of the closing switch energizes the K-relay
which in turn energizes the closing solenoid. Thi�
removes the prop, releasing the closing springs to close
the breaker. The 'F' cutoff switch is only installed on
breakers using D.C. control voltage.
The anti-pump function is obtained through the nor
mally closed K-relay contact in the motor circuit. If a
close signal is maintained after the breaker has tripped
open automatically, the K-relay Is energized preventing
the motor from charging the closing spring. The closing
signal must be removed for approximately
1 .3
to
2.0
seconds to allow the closing spring to charge.
LEGEN D
CC
-
CLOSING SOLENOID
F
-
CUTOFF SWITCH, CLOSED
WH EN CLOSING SPRING IS
FULLY CHARGED (D.C. ONLY)
G
-
CUTOFF SWITCH, OPEN
WHEN CLOSING SPRING IS
FULLY CHARGED.
L
-
AUXILIARY SWITCH
M
-
CHARGING MOTOR
PB-
CLOSE PUSHBUTTON ON
BREAKER ESCUTCHEON.
OPTIONAL
TC
-
SHUNT TRIP DEVICE
K -
ANTI-PUMP
RELAY
FIG. 9A. ALTERNATE ELEMENTARY DIAGRAM. CONTACT POSITIONS ARE
SHOWN BREAKER OPEN AND CLOSING SPRINGS DISCHARGED.
12
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