Maintenance Of The Vacuum Circuit-Breaker Operating Mechanism - Siemens 8DA10 Series Installation And Operating Instructions Manual

Servicing
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Maintenance of the vacuum circuit-breaker operating mechanism

Under normal operating conditions the fixed-mounted circuit-breaker switchgear 8DA10 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.
Hazardous voltage.
Will cause death, serious injury and property damage.
Always observe the Five Safety Rules:
➭ Isolate.
➭ Secure against reclosing.
➭ Verify safe isolation from supply.
➭ Earth and short-circuit.
➭ Cover or barrier adjacent live parts.
Life-endangering voltage
Can cause death, injury or property damage. If the operating mechanism cover is
removed, do not touch any live parts.
➭ Switch off auxiliary voltage.
High speed moving parts
Can cause serious injury.
Do not remove the front cover of the operating mechanism until the following actions have
been performed:
➭ To avoid impermissible switching operations, switch off auxiliary voltage, e.g.:
- Switch the auxiliary voltage supply of the motor.
- Trip the MCB.
- Disconnect the control cables from the low-voltage compartment.
➭ To discharge the spring energy store in the operating mechanism, execute the following
instructions:
- Actuate the manual OFF pushbutton.
- Actuate the manual ON pushbutton.
- Actuate the manual OFF pushbutton again.
➭ Check if the "spring charged" indicator shows "spring charged".
Before starting the maintenance work, see page 158 „Operating the circuit-breaker and the
three-position disconnector.
Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • 861-9601.9
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