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Description
Mechanical interlocking
Vacuum interrupters
22/214
9
Circuit-breaker
9.1
Design
The vacuum circuit-breaker is an integral part of the switchgear panel and consists of the
following components:
• Operating mechanism with stored-energy spring mechanism and control elements (3AH49)
• Operating linkage for contact operation
• 3 switchpanel poles with vacuum interrupters
The circuit-breaker and the three-position disconnector are mechanically interlocked against
each other. During manual operation, the mechanical interlock prevents the circuit-breaker
from being closed as long as the three-position disconnector is not in a defined end position
(CLOSED/OPEN/EARTHED). Furthermore, the mechanical interlock prevents the three-position
disconnector from being operated while the circuit-breaker is closed.
Fig. 5:
Sectional view of
a vacuum interrupter
Revision 06 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • 864-5091.9
①
Moving contact
②
Metal bellows
③
Fixed contact
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