Discharging The Stored Energy Mechanism; Locally Closing The Circuit Breaker; Locally Opening The Circuit Breaker - Siemens SBA 800 Information And Instruction Manual

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Operating Instructions
Part One - Operating the SB Encased Systems Breaker

Discharging the Stored Energy Mechanism

Without Closing the SB Breaker
Discharging the energy in the stored energy mechanism
without closing the SB breaker creates an abnormally high
shock condition on the breaker. The procedure should be
avoided except for safety and/or emergency reasons. To
discharge the energy, push and hold the "Open" pushbutton
then push the "Close" pushbutton.
On electrically-operated SB breakers, the electric operator
should be disabled (one way is to remove the fuse) prior to
discharging the stored energy. Otherwise, the electric opera-
tor will automatically recharge the springs.
Standard closing-prevention devices require that to close the
breaker there be a trip unit in the SB breaker, the stored
energy mechanism be fully charged and the charging handle
be in the stowed position. On drawout constructions, the
interlock lever must be in the interlock engaged position.
Accessories that inhibit the breaker from being locally closed
are presented in the Accessories section. Included are a
closing-blocking device for use with remotely-operated cir-
cuit breakers, key interlocks, and other locking devices.
Discharging energy in the stored energy mechanism
1 8
Courtesy of NationalSwitchgear.com
Closing the SB Breaker Locally
Before the breaker can be closed, the stored energy mecha-
nism must be fully charged and all of the closing-prevention
devices (and accessories) must be in the non-inhibiting state
or position. In this condition, all that is required to close the
breaker is to push the "Close" pushbutton. When the breaker
is closed the "Contact Closed"/"Contact Open" indicator will
point to "Contact Closed."
WARNING - If the "Close" pushbutton is depressed when the
breaker is closed and the stored energy mechanism charged,
the stored energy will be discharged. This will create an
abnormally high shock condition which may result in a
nuisance opening of the breaker.
Indicates that the circuit breaker is "closed" with the springs
in the charged position.
Indicates that the circuit breaker is "open" with the springs in
the discharged position.
Opening the SB Breaker Locally
To locally open the breaker, push the "Open" pushbutton
When the breaker is open, the "Contact Closed "/"Contact
Open" indicator will point to "Contact Open."
Built-in safety devices will trip the SB breaker when the trip
unit is removed, or if the interlock lever on the drawout
mechanism is depressed. Performing the trip unit integral test
in the trip mode will also trip the breaker.

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