Maintenance
9229 0025 176 0A 61
2019-08-05
Maintenance
Maintenance and servicing
Maintenance
The SION
®
vacuum circuit-breaker is maintenance-free under normal service con-
ditions (up to rated current). We do, however, recommend you carry out regular vis-
ual checks. The highest permissible mechanical operating cycle number is:
• 10 000 Operating cycles: Maintenance-free
• 30 000 operating cycles: When maintenance is performed by Siemens author-
ised personnel.
Preliminary work • Prior to starting work on the vacuum circuit-breaker, observe the local safety
regulations for high-voltage devices and the "5 safety rules" as per EN 50110-1.
• Switch off the supply voltage and secure against reclosing.
• On the vacuum circuit-breaker, actuate the OPEN, CLOSE and OPEN pushbut-
tons manually one after the other. This ensures that the vacuum circuit-breaker
is open and the closing spring is discharged.
Special service conditions
If the vacuum circuit-breaker is operated under unfavourable conditions indoors
(heavy and frequent condensation, dusty air, etc.), we recommend cleaning the in-
sulating parts and possibly the outer parts of the circuit-breaker at shorter intervals.
Cleaning
DANGER
High voltage - danger to life!
Touching live parts is fatal or causes serious physical injury.
Before beginning maintenance work, note the 5 safety rules for high-voltage
equipment specified in EN 50110-1, namely:
• Isolate from the power supply
• Secure against reclosing
• Verify safe isolation from the power supply
• Earth and short-circuit
• Cover or cordon off neighbouring live parts
WARNING
Risk of crushing!
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 remove covers.
• Do not reach into openings.
• Do not touch pole assemblies or circuit-breaker shaft.
WARNING
Hot surfaces!
Touching hot components can cause burns.
Let the heater and its surroundings cool down.
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