Siemens 3AH4, Operating Instructions Manual

Page: 15 / 66

General information
9229 9862 176 0D 15
2013-08-28
General information
Smooth and safe operation of this device requires proper transport and storage, and
professional installation and assembly, as well as careful operation and mainte-
nance.
The basic version and all listed configurations of the vacuum circuit-breakers are
type-tested devices as per IEC.
Range of application
3AH4 vacuum circuit-breakers are 3-pole interior circuit-breakers for a rated voltage
range of 12 kV - 36 kV (40.5 kV).
Intended use 3AH4 vacuum circuit-breakers are suitable for switching any type of alternating cur-
rent circuits under normal operating conditions, such as:
• Three-phase motors for reversing, turning and direct operation
• Transformers
• Capacitors
• Resistor consumers
Suitable for high frequency of operation and unlimited on-time.
3AH4 vacuum circuit-breakers operate in continuous, periodic and short-term oper-
ation.
WARNING
Dangerous voltage and mechanical movements
When operating electrical devices, certain parts will always be live, and
mechanical parts may move very quickly, even when remotely controlled.
If the warnings are not observed, serious injury or damage to material may be the
result.
Only personnel with the relevant qualifications may work on or in the vicinity of
this device. These personnel must be familiar with all the warnings and servicing
measures specified in these operating instructions.
Note
In the event of subsequent attachments or integrations, e. g. locking parts in con-
nection with switchgears, ensure that
• fast-moving parts are not additionally loaded with mass or force, and
• additional parts have sufficient clearance, especially from moving and live
parts.
If vacuum circuit-breakers are to be equipped with additional functions by the cus-
tomer, we recommend consulting the factory, since tried and tested solutions are
frequently available (see also “Additional equipment” on page 21).