Siemens NXAIR Operating Instructions Manual page 393

To block any access to the withdrawable circuit-breaker / circuit-breaker truck, turn the
double-bit key until the operating mode indicator changes to "T":
•
To change from "H" to "T" turn 90° counter-clockwise
•
To change from "M" to "T" turn 180° counter-clockwise
Fig. 712: Turning the key 90°
Remove the double-bit key and push the operating slide downwards as far as it will go.
Close the control door.
Fit a padlock to the control door and close the padlock.
✓
Racking the withdrawable circuit-breaker / circuit-breaker truck is blocked.
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Panels with motor operating mechanism control
counter-clockwise
INFORMATION
Final procedure steps
You may now open the high-voltage door and take the withdrawable
circuit-breaker / circuit-breaker truck out of the panel.
INFORMATION
When the control door is closed, the access mode indicator for the withdrawable
circuit-breaker / circuit-breaker truck is covered.
If required, open the control door to read the indicator.
NXAIR / ≤ 40 kA
from
to
Fig. 713: Turning the key 180°
from
to
counter-clockwise
393