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Introduction - Siemens 38-3AH3 38 kV Instruction Manual

Vacuum circuit breaker
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The 38-3AH3 family of vacuum circuit
breakers is designed to meet all applicable
ANSI, NEMA and IEEE standards. Successful
application and operation of this
equipment depends as much upon proper
installation and maintenance by the user
as it does upon the proper design and
fabrication by Siemens.
The purpose of this instruction manual is
to assist the user in developing safe and
efficient procedures for the installation,
maintenance and use of the equipment.
Contact the nearest Siemens
representative if any additional
information is desired.
Signal words
The signal words "danger," "warning" and
"caution" used in this instruction manual
indicate the degree of hazard that may be
encountered by the user. These words are
defined as:
Danger - Indicates an imminently
hazardous situation which, if not avoided,
will result in death or serious injury.
Warning - Indicates a potentially
hazardous situation which, if not avoided,
could result in death or serious injury.
Caution - Indicates a potentially hazardous
situation which, if not avoided, may result
in minor or moderate injury.
Hazardous voltage and high-speed moving parts.
Will cause death, serious injury and property damage.
Always de-energize and ground the equipment before
maintenance. Maintenance should be performed only by
qualified personnel. The use of unauthorized parts in the repair
of the equipment or by tampering by unqualified personnel will
result in dangerous conditions that will cause death, severe
injury or equipment damage. Follow all safety instructions
contained herein.
Caution (without safety alert symbol) -
Indicates a potentially hazardous situation
which, if not avoided, may result in
property damage.
Hazardous Procedures
In addition to other procedures described
in this instruction manual as dangerous,
user personnel must adhere to the
1. Always work only on a de-energized
circuit breaker. The circuit breaker
should be isolated, grounded and
have all control power removed
before performing any tests,
maintenance or repair.
2. Always perform maintenance on the
circuit breaker after the spring-
charged mechanisms are discharged
(except for test of the charging
mechanisms). Check to be certain
that the indicator flags read OPEN and
3. Always let an interlock device or
safety mechanism perform its
function without forcing or defeating
the device.



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