Maintenance Of The Vacuum Circuit-Breaker Operating Mechanism - Siemens 8DB10 Installation And Operating Instructions Manual

864-5091.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • Revision 06
44.5

Maintenance of the vacuum circuit-breaker operating mechanism

Under normal operating conditions the fixed-mounted circuit-breaker switchgear 8DB10 and
the 3AH49 circuit-breaker are maintenance-free.
After 10,000 operating cycles or depending on the respective operating conditions (e. g.
dusty environment, frequent condensation, etc.) we recommend to clean the external parts
and, if necessary, to renew the anti-corrosion protection greasing. To do this, you may only
use the materials specified hereafter on the individual functional parts of the circuit-breaker.
Fig. 215: Greasing plan for 3AH49 operating mechanism
Isoflex Topas L 32
② Curve contour
③ Closing latch
④ Deflection of auxiliary switch
⑥ Guide of opening spring
⑦ Deflecton of auxiliary switch
⑨ Opening latch
⑩
Curve for opening latch
⑪ End stop
⑬
Crank pin for pushbutton operation
Shell Tellus Oil 32
① Bearing for deflection lever
⑤ Auxiliary switch
⑧ Bearing of operating shaft
⑫ Opening spring
Servicing
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