Service And Maintenance; Safety Regulations - Siemens SENTRON 3WL10 Manual

Service and maintenance

7.1

Safety regulations

Only spare parts approved by the manufacturer must ever be used.
The prescribed maintenance intervals and the instructions on repair and replacement must
be complied with to avoid injury to people and damage to equipment.
Safety measures
Before work starts, the following steps must be performed:
1. Open the circuit breaker (OPEN position).
2. On the fixed-mounted breaker:
Disconnect the circuit breaker from the power system and auxiliary circuit and visibly
ground the connections on the line side and on the load side.
On the withdrawable breaker:
Rack the circuit breaker into the breaker position DISCONNECT. If necessary, secure it
against falling.
Disconnect the guide frame from the power system and auxiliary circuit and visibly
ground the terminals on the line side and on the load side.
3. Discharge the springs by closing and opening the circuit breaker again (display
DISCHARGED)
Note
Put the circuit breaker into a safe state that corresponds to the applicable standards and
laws.
Qualified personnel
The circuit breaker must only ever be serviced and maintained by qualified personnel. For
the purpose of the safety information in these operating instructions, a "qualified person" is
someone who is authorized to energize, ground, and tag equipment, systems, and circuits in
accordance with established safety procedures.
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Manual, 10/2018, L1V30499596002-01
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