20
6.2 Interlocks
Warning!
Complete switchgear
interlocking can only
be ensured with com-
plete locking devices.
Warning!
Regarding the imple-
mentation of the inter-
locking systematics,
the purchase contract and the
switchgear-specific circuit dia-
gram must be complied with!
Internal mechanical interlocks
of the panel
• Only one interrogating lever (“dis-
connector“ or “earthing switch“)
can be actuated at the same time.
• The cranks for the disconnectors
and earthing switches can only be
removed in their appropriate end
positions.
• The earthing switch can only be
actuated in direction ON with the
circuit-breaker’s energy storing
device charged (intertripping
circuit of circuit-breaker during
earthing, see sect. 6.3). When the
energy-storing device is not char-
ged, direction reversal from OFF
to ON is prevented during the
OFF actuation.
• When the crank for actuation of
disconnector or earthing switches
has not been removed, or if the
interrogating lever has been
actuated, the circuit-breaker can-
not be switched ON. (Push-but-
ton ON cannot be pressed or the
ON pulse is interrupted. This also
applies for couplers).
Electromagnetic interlocks
Electro-magnetic blocking coils
prevent, depending on the switching
position, actuation of the interro -
gating levers and of the ON/OFF
buttons of the circuit-breaker.
Important!
In case of failure of the
supply voltage, all electro-
magnetic interlocks are in
their "locked" position.
Measure:
Re-establish the supply voltage.
Mechanical lock-out mechanism with cylinder lock (optional)
Turn key Key Actuations on front
control panels
clockwise removable actuation not possible *)
counter-clockwise not removable actuation possible
*)
In the case of feeder panels, the circuit-breaker button “OFF” can be actuated
Fig. 6.2
Interlocks in case of switching operations
Interrogating lever
cannot be actuated
Button cannot
be pressed
Crank cannot be
turned
Mechanical lock-out
Mechanical lock-out mechanism
with padlocks (optional)
Fig. 6.3
1 Interlock flap for push-button
2 Opening for padlock
2
1
2
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