Maintenance - Siemens 3NJ6 Betriebsanleitung

Unlocking the switching
device flap

Maintenance

Fitting the in-line fuse
switch-disconnectors
3ZX1012-0NJ61-2AN1
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Before closing the cover return the lever to the "I" position (lever points in the direction of the
cover lock).
Then swivel the cover onto the switching device until the interlock mechanism reengages,
and close the lock of the cover.
Check regularly that the ventilation slots in the front covers of the switching devices are free
of dirt and clean them if necessary at suitable intervals.
Touching live parts results in death or severe personal
injury.
Only qualified personnel may operate the switchgear; they
must be familiar with the instructions and follow the warning
notices.
Always make sure that the breaker is in the OFF position
before fitting or removing the strips!
If the cubicle has been designed for in-line switching devices of plug-in type without shock-
hazard protection in front of the cubicle busbar, the cubicle busbar (relevant busbar section)
must be isolated before a in-line fuse switch-disconnector is fitted or removed.
Step Procedure
The strips are pushed into the cubicle until the guide pins (sharp pins at the
rear, left an right, of the switching device) engage in the sectional holes of the
left and right-hand distribution bus side walls and the contacts have been
1
pushed directly onto the busbars.
Ensure that the switching device is in a horizontal position when pushing in the
strips.
The strips are then fastened on
the left and right- hand sides to
the vertical front sections with
the aid of two screws M6X12.
No special tool is required if on
the right-hand side the ammeter
2
and/or the monitoring indicator
are pulled out beyond the front.
A ratchet with short insert faci-
litates tightening of the screws
(see Fig.).
Unlocking the switching device
flap by blade in position "I":
Attach the tool at a position of 90°
vertical to the cover and push it
into the notch until resistance is
felt. Then depress the tool until
the flap interlock is deactivated
(see Fig.).
Do not leave the switching
device unattended with the
cover open!
Caution
19