Siemens NXAIR Operating Instructions Manual page 367

Operating the interlocks
Precondition
•
High-voltage door closed
Procedure
Turn the rotary button counter-clockwise until it is possible to lift the cover.
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 feeder earthing switch is in CLOSED position (2). To interlock switching to
OPEN, turn the associated key (1) counter-clockwise as far as it will go, and remove it.
To release an interlocked function, insert the associated key, and turn it clockwise as far as it
will go (that is 180°).
Example: The feeder earthing switch is in CLOSED position (2). To release switching to
OPEN, insert the associated key (1) as far as it will go, and turn clockwise.
Fig. 666: Example: Interlocking / releasing switching to OPEN
Lower the cover and secure it by turning the rotary button clockwise.
✓
The selected operating function is interlocked / released.
110-0134.9 / 14
NXAIR / ≤ 40 kA
Key-operated interlocks
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