Date Code 20010731 Installation 2-15
SEL-352-1, -2 Instruction Manual
Two six-position female plug-in connectors for optoisolated inputs IN101 through
IN103 and IN104 through IN106.
One eight-position female plug-in connector for the EIA-485 serial port connection Port
1, and the demodulated IRIG-B input. (Alternatively, IRIG-B may be brought through
Port 2.)
Four six-position female plug-in connectors for I/O board output contacts OUT201
through OUT203, OUT204 through OUT206, OUT207 through OUT209, and OUT210
through OUT212.
Two eight-position female plug-in connectors for I/O board optoisolated inputs IN201
through IN204 and IN205 through IN208.
These connectors accept wire sizes AWG 24 to 12. Strip the wires 0.31" (8 mm) and install with
a small slotted-tip screwdriver. Secure each connector to the relay chassis with the screws
located on each end of the connector.
The SEL-WA0352 wiring harness includes the following pre-wired connectors:
One six-position CT shorting connector for current inputs IA, IB, and IC. The wire
size selection is from AWG 16 to 10.
One six-position connector (four positions used) for voltage inputs VAX, VBX, VCX,
and VNX. The wire size selection is from AWG 18 to 14.
One six-position connector (four positions used) for voltage inputs VAY, VBY, VCY,
and VNY. The wire size selection is from AWG 18 to 14.
One connector for POWER inputs (+ and –). The wire size selection is from AWG 18
to 14.
One spade connector for chassis GROUND connection.
Plug the CT shorting connector into terminals Z01 through Z06. Secure the connector to the
relay chassis with the two screws located on each end of the connector. When removing the CT
shorting connector, pull it straight away from the relay rear panel. When the connector is
removed, internal mechanisms within the connector separately short out each power system
current transformer. This connector may be installed in only one orientation.
Plug the voltage connectors into terminals Z13 to Z16 for the VX inputs and Z19 to Z22 for the
VY inputs, as appropriate. These connectors may be installed in only one orientation.
Plug the power connector into terminals Z25 (+) and Z26 (–). Control power passes through
these terminals to a fuse and to the relay power supply. This circuitry is isolated from the relay
chassis ground.
Ground the relay chassis at terminal Z27 with the spade connector provided (tab size 0.25" wide
by 0.032" thick). If the tab on the chassis is removed, the chassis ground connection can be
made with the size #6-32 screw.
Note: Important: Improvements in Connectorized SEL-352 Relays (Plug-In Connectors)
Result in Part Number Changes
The current transformer shorting connector (for current channel inputs IA, IB, IC, and
IN) has been made more robust. This improvement makes the new connector design
incompatible with the old design. Thus, presently constructed Connectorized SEL-352
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