Sel 421 - Page 48

U.1.6
SEL-421 Relay User’s Guide Date Code 20090715
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 standard Form C outputs
➢ INT7:
Contact inputs: 8 independent inputs (level sensitive
and optoisolated);
Contact outputs: 13 High-Current Interrupting Form A
and 2 standard Form C outputs
➢ INT8:
Contact inputs: 8 independent inputs (level sensitive
and optoisolated);
Contact outputs: 8 Fast 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 120 Vac
➢ 125/250 Vdc or 120/230 Vac
➤ Secondary inputs
➢ 1 A nominal or 5 A nominal CT inputs.
300 V phase-to-neutral wye configuration PT inputs
➤ Communications 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 Transfer, SEL Fast Meter, SEL Fast Operate, SEL
Fast SER, RTDs, Enhanced M
IRRORED BITS
Communications), and Synchrophasors (SEL Fast
Message and IEEE C37.118 format).
➢ Complete group of SEL protocols, Synchrophasors
(SEL Fast Message and IEEE C37.118 format), plus
DNP3
➢ Complete group of SEL protocols, Synchrophasors
(SEL Fast Message and IEEE C37.118 format), plus
IEC 61850
Courtesy of NationalSwitchgear.com