Siemens 3AH4 - Maintenance; Maintenance and Servicing Safety

Maintenance
9229 9862 176 0D 53
2013-08-28
Maintenance
Maintenance and servicing
To maintain reliability during the entire operating time and to ensure the operating
cycle numbers, depending on
• the type of vacuum circuit-breaker (see “Technical data” on page 33)
• the operating conditions see “Ambient conditions” on page 34),
• the number of mechanical and electrical operating cycles,
• and the operating time,
regular maintenance work must be performed according to the following mainte-
nance plan.
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.