Description
32 9229 9992 176 0D
2013-07-08
Interlocking 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 an
interlocking 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
switchgear 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 interlock (optional with spring drive mechanism)
An interrogation and actuation component (b) on the system side scans the
operating position (CLOSED/OPEN) of the vacuum circuit-breaker.
CLOSED position If the vacuum circuit-breaker is closed, actuation of the system's interrogation and
actuation component (b) is prevented. A mechanical system in the switchgear truck
or withdrawable section reliably blocks movements of the circuit-breaker on the
switchgear truck or withdrawable section.
OPEN position If the vacuum circuit-breaker is open, the interrogation and actuation component (b)
on the system side actuates, via the stroke (a), the vacuum circuit-breaker's
mechanical interlock and reliably blocks closing of the vacuum circuit-breaker.
Fig. 43 Mechanical interlock
The installation dimensions (c + d) for the interrogation and actuation component (b)
are in the dimension drawing.
X CLOSED position a Stroke (min. 10 mm, max. 30 mm)
Y OPEN position b Interrogation or actuation component (min. actuation force 70 N)
Z View from below c + d see dimension drawing
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