Siemens NXAIR M Operating Instructions Manual page 192

Key-operated interlocks
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. 322: Interlocking switching to OPEN
To release an interlocked function, insert the associated key, and turn 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. 324: Releasing switching to OPEN

The selected operating function is interlocked / released.
192
Fig. 323: Position indicator
Fig. 325: Position indicator
NXAIR M
for busbar earthing switch:
CLOSED
for busbar earthing switch:
CLOSED
139-2021.9 / 07