Operation
148/214 Revision 06 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • 864-5091.9
36 Circuit-breaker operation
Circuit-breaker
control board
36.1 Closing the circuit-breaker manually
Preconditions • "Feeder earthed" locking device is open
• Closing spring is charged
➭ Operate the ON pushbutton in the circuit-breaker control board.
✔ The position indicator changes to "I" position. The circuit-breaker is closed.
36.2 Opening the circuit-breaker manually
If the control voltage fails, the circuit-breaker can only be opened mechanically by hand.
Preconditions • "Feeder earthed" locking device is open
➭ Operate the OFF pushbutton in the circuit-breaker control board.
✔ The circuit-breaker is open.
ATTENTION
Operating the circuit-breaker locking device in the OPEN or CLOSED positions can damage
the switchgear.
➭ Operate the circuit-breaker locking device only in the EARTHED position, and padlock it.
Fig. 170: Circuit-breaker control board
①
ON pushbutton
②
OFF pushbutton
③
"Feeder earthed“ locking device
④
Operations counter
⑤
Position indicator for
circuit-breaker
⑥
"Closing spring charged / not
charged“ indicator
⑦
Opening to charge
the closing spring manuallly
NOTE
OFF signals ineffective
➭ If the feeder is earthed through the three-position disconnector and the circuit-breaker,
all electrical OFF signals are ineffective.
DANGER
If the "feeder earthed" locking device is padlocked, the circuit-breaker cannot be opened,
neither electrically nor mechanically.
➭ Fit the padlock only if the feeder is earthed.
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