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SEL-751 Relay Instruction Manual Date Code 20170927
Preface
Safety Information
The following figure shows the LED location specific to the SEL-751 (see
Figure 2.9 for the complete rear-panel drawing).
SEL-751 LED Locations
Environmental
Conditions and
Voltage Information
The following table lists important environmental and voltage information.
LED Safety Warnings and Precautions
➤ Do not look into the end of an optical cable connected to an
optical output.
➤ Do not look into the fiber ports/connectors.
➤ Do not perform any procedures or adjustments that are not
described in this manual.
➤ During installation, maintenance, or testing of the optical
ports only use test equipment classified as Class 1 laser
products.
➤ Incorporated components such as transceivers and laser/LED
emitters are not user serviceable. Units must be returned to
SEL for repair or replacement.
Fiber-Optic
Serial Port LED
Arc-Flash Detection
LEDs for Self-Test
Fiber-Optic
Ethernet
Port LEDs
i5364a
Condition Range/Description
Indoor/outdoor use Indoor
Altitude
a
To 2000 m
Temperature
IEC Performance Rating
(per IEC/EN 60068-2-1
and IEC/EN 60068-2-2)
–40 to +85°C
Relative humidity 5 to 95%
Main supply voltage fluctuations To ±10% of nominal voltage
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