Siemens NXAIR M Operating Instructions Manual page 212

Panels with motor operating mechanism control
Preconditions

Feeder earthing switch in OPEN position

Circuit-breaker in OPEN position

Panel set to local control

Control door open

Withdrawable circuit-breaker in service position or in test position

For electromagnetic interlock (optional):

Electromagnetic interlock deactivated

Access mode indicator shows "M" or "T"
Procedure
To release the actuating opening for the double-bit key, lift the operating slide (1) and hold it.
Insert the double-bit key (2).
Fig. 359: Lifting the operating slide and inserting the key
To release manual access to the withdrawable circuit-breaker, turn the double-bit key until
the operating mode indicator changes to "H":

To change from "M" to "H" turn 90° counter-clockwise

To change from "T" to "H" turn 90° clockwise
Fig. 360: Turning the key counter-clockwise
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Fig. 361: Turning the key clockwise
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139-2021.9 / 07