Operation
80 REVISION 02 * OPERATION SIMOSEC* 832-6063.0
19.7 Switching the three-position switch with FII-Protection-System (option)
The Fuse-Installed-Intact-Protection-System (FII-Protection-System) could be installed in
fuse switch panels. It prevents to switch the three-position switch to CLOSED position if
only one fuse is blown or not installed. To switch the three-position switch to OPEN
position is possible if the FII-Protection-System is active.
Switch to CLOSED position The shutter of the FII-Protection-System is visible in the slot for closing/opening of the
three-position switch.
Fig. 62: Shuttter of FII-Protection-System
To switch the three-position to CLOSED position is blocked by the shutter.
Fig. 63: Switching to CLOSED position blocked by shutter
Ö Check if fuses are blown or not installed.
Ö Replace or install fuses.
Ö Check if the shutter of the FII-Protection-System is still visible in the slot for closing/
opening of the three-position switch.
Ö Switch the three-position switch to CLOSED position.
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