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SEL-421/SEL-421-1 Relay Date Code 20020501
Preface
➤ Reference to information on another page in the same section
includes the reference item and the page number
➢ Table 3.1 on page 3.2
➢ Oscillography on page 3.8
➤ Reference to information in another section in the same volume
includes the reference item, page number (if appropriate), and
the volume name
➢ Table 3.1 on page A.3.2 in the Applications Handbook
➢ Oscillography on page A.1.5 in the Applications
Handbook
➤ Reference to information in another volume includes the
reference item, page number (if appropriate), and volume name
➢ Access Levels on page U.4.8 in the User’s Guide
➢ Section 4: Basic Relay Operations in the User’s Guide
Alerts
DANGER
DANGER: Disconnect or
de-energize all external
connections before opening this
device. Contact with hazardous
voltages and currents inside this
device can cause electrical shock
resulting in injury or death.
!
DANGER statements indicate an imminently hazardous situation that, if not
avoided, will result in death or serious injury. The text to the left is an example
of a DANGER statement.
WARNING
WARNING: Have only
qualified personnel service this
equipment. If you are not qualified to
service this equipment, you can
injure yourself or others, or cause
equipment damage.
!
WARNING statements indicate a potentially hazardous situation that, if not
avoided, can result in death or serious injury. WARNING and DANGER tags
do not apply to property damage hazards unless these hazards also involve
personal injury risk appropriate to these levels. The text to the left is an
example of a WARNING statement.
11 D GER
CAUTION
CAUTION statements are in two different forms:
CAUTION: Equipment
components are sensitive to
electrostatic discharge (ESD).
Undetectable permanent damage
can result if you do not use proper
ESD procedures. Ground yourself,
your work surface, and this
equipment before removing any
cover from this equipment. If your
facility is not equipped to work with
these components, contact SEL
about returning this device and
related SEL equipment for service.
!
➤ A CAUTION statement indicates a potentially hazardous
situation that, if not avoided, can possibly result in minor or
moderate injury. The text to the left is an example of this kind
of CAUTION statement.
CAUTION: Equipment damage can
result from connecting ac circuits to
Hybrid (high-current-interrupting)
control outputs. Do not connect a
circuit to Hybrid control outputs. Use
only dc circuit with Hybrid control
outputs.
➤ A CAUTION statement alerts you about unsafe practices that
can possibly cause property damage. The text to the left is an
example of this kind of CAUTION statement.
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