1.6
SEL-421 Relay Instruction Manual Date Code 20171021
Introduction and Specifications
Models and Options
➢ INT6:
Contact inputs: 8 independent inputs (programmable pickup
threshold);
Contact outputs: 13 high-current interrupting Form A and 2 stan-
dard Form C outputs
➢ INT7:
Contact inputs: 8 independent inputs (level sensitive and
optoisolated);
Contact outputs: 13 high-current interrupting Form A and 2 stan-
dard Form C outputs
➢ INT8:
Contact inputs: 8 independent inputs (level sensitive and
optoisolated);
Contact outputs: 8 high-speed, high-current interrupting Form A
outputs
➤ Chassis orientation and type
➢ Horizontal rack mount
➢ Horizontal panel mount
➢ Vertical rack mount
➢ Vertical panel mount
➤ Power supply
➢ 24–48 Vdc
➢ 48–125 Vdc or 110–120 Vac
➢ 125–250 Vdc or 110–240 Vac
➤ Secondary inputs
➢ 1 A nominal or 5 A nominal CT inputs
➢ 300 V phase-to-neutral wye configuration PT inputs
➤ Ethernet card options
➢ Ethernet card with combinations of 10/100BASE-T and
100BASE-FX media connections on each of two ports
➤ Communications protocols
➢ Complete group of SEL protocols
(SEL ASCII, SEL Compressed ASCII, SEL Settings File Trans-
fer, SEL Fast Meter, SEL Fast Operate, SEL Fast SER, RTDs,
Enhanced M
IRRORED BITS Communications), and Synchropha-
sors (SEL Fast Message and IEEE C37.118 format), and DNP3
➢ All of the standard protocols, plus IEC 61850
➤ Connector type
➢ Screw-terminal block inputs
➢ Connectorized
Contact the SEL factory or your local Technical Service Center for particular part
number and ordering information (see Technical Support on page 3.23). You can
also view the latest part number and ordering information on the SEL website at
selinc.com.
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