Siemens NXAIR M Operating Instructions Manual page 38

Operating the circuit-breaker panel
Preconditions

Withdrawable circuit-breaker in service position

Circuit-breaker in OPEN position

Racking crank for moving the withdrawable circuit-breaker available

Double-bit key available

Padlock (optional) removed from operating slide

For electromagnetic interlock (optional):

Electromagnetic interlock deactivated

For panels with removable voltage transformers (optional):

Removable voltage transformers racked to test position
The actuating opening for racking the withdrawable circuit-breaker is located on the control board of the
high-voltage door.
Fig. 48: Actuating opening for
racking the withdrawable
circuit-breaker
Procedure
Lift the operating slide and hold it.
To release access to the withdrawable circuit-breaker, insert the double-bit key and turn
counter-clockwise as far as it will go (that is 90°).
38
Fig. 49: Racking crank
NOTICE
Maloperation
All interlocks are only released when the withdrawable part is in a stable end
position.
Rack the withdrawable circuit-breaker absolutely until end position.
Fig. 51: Releasing access to the withdrawable part
NXAIR M
Fig. 50: Double-bit key,
diameter 5 mm
139-2021.9 / 07