Description
32 9229 9860 176 0E
2013-08-22
Locking devices
To lock vacuum circuit-breakers as a function of the switching position, the spring
drive mechanisms of the vacuum circuit-breaker can be equipped with a locking
device. This is also the case for vacuum circuit-breakers on switch gear trucks, in
withdrawable sections or with disconnectors.
Conditions The vacuum circuit-breaker must only be switched on in operating or disconnected
position. The operating or disconnected position is the position of the vacuum circuit-
breaker on the switchgear truck or withdrawable section in the switchgear. At the
same time, the vacuum circuit-breaker may be moved on the switchgear truck or
withdrawable section only when it is open.
Positions of the vacuum circuit-breaker in the switchgear
Disconnected position The isolating distance between the vacuum circuit-breaker contacts and the switch-
gear counter-contacts is attained fully.
Operating position The circuit-breaker is inserted fully into the switchgear and the vacuum circuit-
breaker contacts overlap completely with the switchgear counter-contacts.
Mechanical locking device (optional with spring drive mechanism)
A sensing and actuation component (b) on the system side detects the operating
position (CLOSED/OPEN) of the vacuum circuit-breaker.
CLOSED switching posi-
tion
If the vacuum circuit-breaker is closed, actuation of the system's sensing and actu-
ation component (b) is prevented. A mechanical system in the switchgear truck or
withdrawable section reliably blocks movements of the circuit-breaker on the switch-
gear truck or withdrawable section.
OPEN switching position If the vacuum circuit-breaker is open, the sensing and actuation component (b) on
the system side actuates, via the stroke (a), the vacuum circuit-breaker's mechani-
cal locking device and reliably blocks closing of the vacuum circuit-breaker.
Fig. 43 Mechanical locking device
The installation dimensions (c + d) for the sensing and actuation component (b) are
in the dimension drawing.
X CLOSED switching position a Stroke (min. 10 mm, max. 30 mm)
Y OPEN switching position b Interrogation or actuation component (min. actuation force 70 N)
Z View from below c + d see dimension drawing
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