2.12
SEL-351A Relay Instruction Manual Date Code 20080213
Installation
Making Rear-Panel Connections
Chassis Ground
Model 0351A0W
Ground the relay chassis at terminal Z27 with the spade connector provided in
the previously discussed wiring harness (tab size 0.250 inches x 0.032 inches).
If the tab on the chassis is removed, the chassis ground connection can be
made with the size #6-32 screw.
Models 0351Ax0
Ground the relay chassis at terminal Z27.
Power Supply
Model 0351A0W
The power supply wiring harness includes a two-position connector and
factory-installed wire. Note the polarity indicators on terminals Z25(+) and
Z26(–). Control power passes through these terminals to a fuse and to the
switching power supply. The control power circuitry is isolated from the relay
chassis ground.
Plug the power supply connector into terminals Z25 and Z26. The connector
locks in place upon insertion.
Refer to Section 1: Introduction and Specifications for power supply ratings.
The relay power supply rating is listed on the serial number sticker on the
relay rear panel.
Models 0351Ax0
Connect control voltage to the POWER terminals. Note the polarity indicators
on terminals Z25(+) and Z26(–). Control power passes through these terminals
to a fuse and to the switching power supply. The control power circuitry is
isolated from the relay chassis ground.
Refer to Section 1: Introduction and Specifications for power supply ratings.
The relay power supply rating is listed on the serial number sticker on the
relay rear panel.
Output Contacts
Refer to Control Outputs on page 1.10 for output contact ratings.
The standard output contacts are not polarity dependent.
Optoisolated Inputs
The optoisolated inputs in any of the SEL-351A models (e.g., IN102) are not
polarity dependent. With nominal control voltage applied, each optoisolated
input draws approximately 4 mA of current. Refer to Optoisolated Inputs on
page 1.10 for optoisolated input ratings.
Inputs can be configured to respond to ac or dc control signals via Global
settings IN101D to IN106D.
Refer to the serial number sticker on the relay rear panel for the optoisolated
input voltage rating (listed under label: LOGIC INPUT).
Courtesy of NationalSwitchgear.com
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