Introduction and maintenance intervals
Periodic inspections and maintenance are
essential to safe and reliable operation of
the type 38-3AH3 vacuum circuit breaker.
When the type 38-3AH3 vacuum circuit
breaker is operated under "usual service
conditions," maintenance and lubrication
is recommended at ten-year intervals or at
the number of operations indicated in
"Usual" and "unusual" service conditions
for medium-voltage metal-clad switchgear
are defined in ANSI/IEEE C37.20.2, section
8.1 and C37.04, section 4 together with
C37.010, section 4. Generally, "usual
service conditions" are defined as an
environment where the equipment is not
exposed to excessive dust, acid fumes,
damaging chemicals, salt air, rapid or
frequent changes in temperature,
vibration, high humidity and extreme
The definition of "usual service conditions"
is subject to a variety of interpretations.
Because of this, you are best served by
adjusting maintenance and lubrication
intervals based on your experience with
the equipment in the actual service
Hazardous voltage and high-speed moving parts.
Will cause death, serious injury and property damage.
Do not by-pass interlocks or otherwise make interlocks
inoperative. Interlocks must be in operation at all times.
Read instruction manuals, observe safety instructions and use
Regardless of the length of the
maintenance and lubrication interval,
Siemens recommends the circuit breaker
should be inspected and exercised
For the safety of maintenance personnel as
well as others who might be exposed to
hazards associated with maintenance
activities, the safety-related work practices
of NFPA 70E (especially chapters 1 and 2)
should always be followed when working
on electrical equipment.
Maintenance personnel should be trained
in the safety practices, procedures and
requirements that pertain to their
respective job assignments.
This instruction manual should be
reviewed and retained in a location readily
accessible for reference during
maintenance of this equipment.
The user must establish a periodic
maintenance program to ensure trouble-
free and safe operation.
The frequency of inspection, periodic
cleaning and preventive-maintenance
schedule will depend upon the operation
conditions. NFPA Publication 70B,
"Electrical Equipment Maintenance" may
be used as a guide to establish such a