Siemens NXAIR Operating Instructions Manual page 369

Operating the interlocks
Precondition
•
Door to low-voltage compartment closed
Procedure
To interlock an operating function, turn the associated key counter-clockwise as far as it will
go (that is 180°), and remove it.
Example: The busbar earthing switch is in CLOSED position. To interlock switching to
OPEN, turn the associated key counter-clockwise as far as it will go (1), and remove it (2).
Fig. 668: Interlocking switching to OPEN
To release an interlocked function, insert the associated key, and turn it clockwise as far as it
will go (that is 180°).
Example: The busbar earthing switch is in CLOSED position. To release switching to OPEN,
insert the associated key (1), and turn clockwise as far as it will go (2).
Fig. 670: Releasing switching to OPEN
✓
The selected operating function is interlocked / released.
110-0134.9 / 14
Fig. 669: Position indicator for
Fig. 671: Position indicator for
NXAIR / ≤ 40 kA
Key-operated interlocks
busbar earthing switch:
CLOSED
busbar earthing switch:
CLOSED
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