Operation
6
Description of Operation
Manually operated — All manually operated breakers are
charged via the pump handle in the escutcheon. Operating
the charging handle several times fully charges the closing
springs. A flag in the
escutcheon will indicate
the springs are
CHARGED and the
charging handle will
free-wheel. The breaker
is now ready to be closed
by pressing the CLOSE
button in the
escutcheon. All breakers
have a charge-after-close
feature that allows the
closing springs to be
recharged after closing.
This permits a
charge/close/recharge/trip/close/trip sequence of opera-
tion. The breaker opening springs are automatically
charged when the breaker is closed. The breaker may be
opened by pressing the OPEN button.
Electrically operated — All electrically operated breakers
are provided with a spring charging motor, manual charg-
ing handle, electronic closing circuit with anti-pump feature
and a shunt trip. Upon application of control power to the
breaker (secondary disconnect A8 & A17), the closing
springs will charge. Power to the spring charging motor is
removed automatically by a cutoff switch when the springs
are fully charged and the breaker is ready to operate.
Closing can be accomplished by pressing the manual
CLOSE button in the escutcheon (if so equipped) or by
applying voltage to the closing circuit (secondary disconnect
A9 & A18). The closing springs will automatically recharge
after the breaker is closed. The spring charging circuit is
wired separately from the closing circuit so that a separate
source can be used for spring charging as well as providing
the ability to block automatic recharging of the springs if
required by the breaker application. The anti-pump feature
in the closing circuit provides one closing operation of the
breaker for each application of a close signal — a main-
tained close signal on the breaker will produce only one
close operation and the close signal must be removed and
reapplied to reclose the breaker. Mechanical interlocks pre-
vent closing the breaker with partially charged springs and
also prevent the closing springs from discharging if an
attempt is made to close a beaker which is already closed.
Electrically operated breakers are provided with a manual
CLOSE button in the escutcheon. If local manual closing is
not required, the breaker can be equipped with a “HIDDEN
ON” feature that
replaces the CLOSE
button with a limit-
ed access cover — a
0.100” rod is
required to manual-
ly close the breaker.
The manual charg-
ing
handle built into the
escutcheon can be
used to charge the
closing springs in
the event control
power is not avail-
able or is interrupt-
ed during the spring
charging cycle. Opening of the circuit breaker is accom-
plished by pressing the OPEN button or by energizing the
shunt trip coil.
Sequence of operation
OPEN/CLOSED
Main Breaker
Charge
Condition of
Next Permissible
Indicator
Contacts
Indicator
Charging Springs
Operating Function
OPEN
Open
DISCHARGED
Discharged
Mechanism may be charged
OPEN
Open
CHARGED
Fully Charged
Breaker may be closed
CLOSED
Closed
DISCHARGED
Discharged
Mechanism may be recharged or
Breaker may be opened
CLOSED
Closed
CHARGED
Fully Charged
Breaker may be opened
OPEN
Open
CHARGED
Fully Charged
Breaker may be closed or mechanism
may be discharged without closing
contacts by holding the OPEN button
depressed while pushing CLOSE button
