ABB Power Distribution 49
The switch-disconnector is then ready to
open, also in response to fuse tripping, shunt
and undervoltage releases.
• Open the switch-disconnector by turning the
operating lever 122 clockwise through
approx. 15°. Then turn the operating lever
back anti-clockwise until the stop is reached.
• Observe the position indicator (see also
section 6.2.8).
3. Opening and closing of a switch-disconnector
with snap-action ON mechanism and stored-
energy spring OFF mechanism (type CS3):
• Close the switch-disconnector by turning the
operating lever 122 clockwise through approx.
180° up to the stop, or open the switch-dis-
connector by turning the operating lever anti-
clockwise through approx. 180° up to the stop.
When the switch-disconnector is then ready
to open, it will also respond to fuse tripping,
shunt and undervoltage releases.
Special case:
Charge and engage the closing springs by
turning the lever anti-clockwise through approx.
180° up to the stop (pretensioning).
This action is only required:
• on initial installation (stored-energy springs
then normally discharged).
• for indirect operation (tripping by HRC fuse,
shunt and undervoltage release).
4. Opening and closing an integrated earthing
switch:
• Switching of a normally interlocked earthing
switch is only enabled when the switch-dis-
connector is in the open position.
• Close the earthing switch by turning the oper-
ating lever 122 clockwise through approx. 180°
up to the stop, or open the earthing switch by
turning the operating lever anti-clockwise
through approx. 180° up to the stop.
• Observe the position indicator (see also
section 6.2.8).
5. Opening and closing with a motor-operated
mechanism:
Switch-disconnectors and earthing switches can
also be fitted with motor-operated mechanisms.
• Operate the electrical control to open/close
the switch (briefly), and the switch-disconnec-
tor or earthing switch will then be switched
automatically into the opposite position, or the
stored-energy springs for the switch-dis-
connector charged.
Emergency manual operation:
If a fault occurs in the motor-operated mechanism,
the switch-disconnector and earthing switch can
be operated manually in emergencies with
operating lever 122, in a similar manner to a switch
witch manual mechanism. To disengage the
coupling to the motor-operated mechanism, first
turn the operating lever 122 up to the relevant stop
(small angle of turn).
On the next operation with the motor-operated
mechanism after its function has been restored, the
coupling automatically reengages.
Note:
The operating lever may only be fitted temporarily
for performance of an emergency manual
switching operation.
The power to the motor-operated mechanism
must be switched off for the duration of any
breakdown.
6.2.7 Insulating protection plate
(Figure 6/15)
With the isolating distance of the switch-dis-
connector open, an insulating protection plate 36
can be inserted into the relevant panel on rails.
Notes:
• Always clean and inspect insulating protection
plates before use.
• When moisture and dirt cause layers of foreign
matter to build up on a protection plate, there is
danger due to possible leakage currents.
• Insulating protection plates are only suitable as
protection against accidental contact and not as
protection against reclosing.
• The service duration of inserted protection
plates is fundamentally limited by influence of
moisture, temperature, contamination and the
adjacency of live parts.
• Observe the details listed in section 7.2 with
regard to the insulating protection plates.
6.2.8 Electrical/mechanical annunciation/monitoring
When the switchgear is in operation, observe all the
operating data and condition indications in the
secondary area.
Position indicator for switch-disconnectors:
• Type CK3: The switch position is identical to
the mechanism position.
• Typ CR3: The switch position is not identical
to the mechanism position.
• Typ CS3: The switch position is identical to
the mechanism position when
operation is direct.
For indirect operation (by fuse or
electrical release), the opening
operation results in different posi-
tions for the switch and mecha-
nism.
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