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4.1.2.4
Motor operated
mechanism 2
Motor operated mechanism 2 (figure 4.1.2.4.1) is in principle iden-
tical to manual mechanism 2. It does however have a motor for
operation of the three position disconnector.
The circuit-breaker and three position disconnector are as a rule
operated by remote control (from the control room). If electrical
controls (e.g. the HMI of a control unit) are fitted on the panel, they
can be operated electrically there. Manual operation of the three
position disconnector is possible as an alternative.
The three position disconnector is mechanically interlocked against
the closed circuit-breaker. The earthing switch can only be oper-
ated when the disconnector is open, and vice versa.
Fig. 4.1.2.4.1: Motor operated mechanism 2: Displays and controls
1
OFF button for circuit-breaker
2
ON button for circuit-breaker
3
Switch position indicator for
circuit-breaker
4
Selector lever
5
Opening for disconnector operation
6
Switch position indicator for
disconnector
7
Opening for earthing switch
operation
8
Switch position indicator for
earthing switch
4.1.2.4.1 Operation of the
− Mechanical switch position indication is effected by a
graphical symbol (3) in the low voltage compartment door.
− In order to change the switching condition of the circuit-
breaker, press the mechanical OFF button (1) or the me-
chanical ON button (2).
4.1.2.4.2 Motorized operation of
Motorized operation of the three position disconnector is possible
at the panel when electrical controls (e.g. buttons in the door or
control unit with integrated buttons) are fitted. Operate the appro-
priate controls to close and open the three position disconnector.
6
8
4.1.2.4.3 Manual operation of
4
5
7
2
Turning of the selector lever (4) causes a slide to release the open-
ing (5 or 7) for the operating lever of the disconnector or earthing
1
switch. The selector lever can only be turned when the circuit-
3
breaker is open. The selector lever can only be turned for earthing
switch operation when the disconnector is open, and for discon-
nector operation when the earthing switch is open.
− The selector lever can be blocked by a padlock.
− Mechanical switch position indication is effected by graphi-
cal symbols (6 and 8) in the low voltage compartment door.
− Two different cranks are required for operation of the earth-
ing switch and the disconnector. The operating crank for
the earthing switch is marked in red (figure 4.1.2.4.3.1).
Always perform all switching operations up to the
stop
circuit-breaker
the three position
disconnector
the three position
disconnector
Manual ZX0 HB 600 en - Revision 05 | 49
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