Siemens NXAIR M Operating Instructions Manual page 43

Preconditions

Withdrawable circuit-breaker in service position or in test position

Circuit-breaker in OPEN position

Spring state indicator for the closing spring shows CHARGED

High-voltage door closed

Panel set to local control

Padlock (optional) removed from the actuating opening

Push rod available
Fig. 57: High-voltage door with
139-2021.9 / 07
HINT
Auxiliary voltage for the panel connected
If the auxiliary voltage is disconnected when closing the circuit-breaker manually,
the spring energy store for closing the circuit-breaker is no longer recharged
automatically.
Connect the auxiliary voltage before closing the circuit-breaker manually.
Otherwise the spring energy store must be recharged manually with a
hand crank.
HINT
If an undervoltage release is fitted, it must be connected to the auxiliary voltage for
the switching operation, as otherwise closing is not possible.
HINT
Unexpected motor noise and vibration
Operating the circuit-breaker discharges and/or charges the spring energy store
abruptly. This causes a short loud noise and low vibration.
Expect switching noise and low vibration from inside the circuit-breaker.
HINT
The opening spring is charged during the closing operation.
actuating opening
Operating the circuit-breaker panel
Fig. 58: Push rod
NXAIR M 43