Maintenance
9229 9860 176 0E 53
2013-08-22
Maintenance
Maintenance and servicing
Maintenance
The 3AH3vacuum circuit-breaker is maintenance-free under normal operating con-
ditions. We do, however, recommend you carry out regular visual inspections. The
maximum permitted mechanical operating cycle number is 10 000.
Cleaning
The insulating parts must be clean if their insulating capacity is to be guaranteed.
Rub insulating parts with a moist cloth.
As a cleaning agent, use only warm water with a mild, liquid household detergent
added and leave to dry.
Joints and bearings that cannot be disassembled must not be washed out with a
detergent prior to work.
DANGER
High voltage – danger to life
Touching live parts is fatal or causes serious physical injury.
Before beginning maintenance work, note the five 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
*
)
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.
Note
The vacuum circuit-breaker should be taken out of the switch cabinet or switch-
gear for servicing.
Siemens Parts
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