Description
22 Revision 03 * INSTALLATION AND OPERATING INSTRUCTIONS 8DJH * 500-8067.9
7.3 Interlocks
Mechanical interlock • The switching gate prevents switching straight from "CLOSED" to "EARTHED" or from
"EARTHED" to "CLOSED", as the operating lever must be re-inserted in the "OPEN"
position.
• The cable compartment cover (HV HRC fuse compartment cover) can only be removed
if the transformer feeder is earthed and the operating lever is removed.
The three-position switch-disconnector can only be switched from the "EARTHED"
position to another position if the cable compartment cover (HV HRC fuse
compartment cover) is fitted.
• Interlocks between the circuit-breaker and the three-position disconnector
- Circuit-breaker in OPEN position: The three-position disconnector can be closed and
opened. The circuit-breaker is locked out.
- Circuit-breaker in CLOSED position: The three-position disconnector cannot
be operated.
• The cable compartment covers can only be removed when the associated feeder
is earthed.
• A closing lock-out (option) in the ring-main or circuit-breaker feeder prevents
the three-position disconnector / switch-disconnector from being switched to
the "CLOSED" position if the cable compartment cover is removed.
• A de-earthing lock-out in the transformer panel (standard), the ring-main panel or
the circuit-breaker panel (option) prevents the three-position disconnector / switch-
disconnector from being switched from "EARTHED" to "OPEN" if the cable
compartment cover is removed.
• With stored-energy and circuit-breaker operating mechanisms, closing and opening is
not possible if the operating lever is inserted.
• The locking device (option) of the switching gate can be padlocked in all three switch
positions. The locking device can be padlocked so that no closing or no opening or
no earthing is possible. The padlock can also be fitted in such a way that none of
the three switching operations can be performed.
Electrical interlock If the operating lever for the three-position switch is inserted, the motor operating
mechanism cannot be operated from remote or locally anymore.
Padlock Down Center Up
Actuating opening Earthing switch - Disconnector/
switch-disconnector
Circuit-breaker/
transformer switch
Possible switching operations Only EARTHING and
DE-EARTHING possible
No switching operations possible - Only CLOSING and
OPENING possible
- Only possible if the
circuit-breaker is open
- Charging the spring
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