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1 HDU 05004-YN Rev. C
part 2. A “CLOSED” position signal is given after closing near the top dead center (i.e. after closing of
the current path of the disconnector and near top dead center interlocking by the operating linkage) and
is cancelled upon opening even before the top dead center is reached (i.e. before interlocking is
cancelled). The signal for the “OPEN” position is given analogously.
The safety contact (14) interrupts the control circuit for the motor when the manual emergency crank
(18) is inserted, so that the unit can now be operated only with the manual emergency crank.
The optional blocking magnet (19) when de-energised, prevents the motor-operated mechanism from
being operated manually, as it is not possible to insert the hand crank (18) into auxiliary pin (8) for
emergency operation. In the case of AC operation, a rectifier (37) is installed upstream of the blocking
magnet. An additional interlock switch (51), directly attached and actuated by the blocking magnet (19)
allows electrical operation only when the blocking magnet is energised.
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