Description
28 9229 0025 176 0A
2019-08-05
Interlocks
To lock vacuum circuit-breakers as a function of the switching position, the spring
charge mechanisms of the vacuum circuit-breaker can be equipped with an inter-
lock. This also applies to vacuum circuit-breakers on switchgear trucks, in withdraw-
able sections or with disconnectors.
Conditions If the vacuum circuit-breaker is mounted on a carriage or withdrawable part, it may
only be switched on in the operating or disconnected position.
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 100 %.
Operating position The vacuum circuit-breaker is inserted fully into the switchgear and the contacts
overlap completely with the switchgear counter-contacts.
Mechanical interlock (optional)
A sensing and actuation component (b) on the system side detects the operating po-
sition (CLOSED/OPEN) of the vacuum circuit-breaker.
CLOSED switch 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 switch 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 interlock and reliably blocks closing of the vacuum circuit-breaker.
WARNING
Danger of crushing due to sudden movement of components
Mechanical parts can move quickly, even if they are remote-controlled. Contact
with mechanical parts or parts under spring charge can lead to crushing of body
parts.
• Do not reach into openings.
• Do not touch pole assemblies or circuit-breaker shaft.
• Secure the vacuum circuit-breaker from opening during adjustment work in
the CLOSED switch position.
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