html{display:none} SEL-401 Protection, Automation, and Control Merging Unit - Specifications | Schweitzer Engineering Laboratories


AC Current Inputs
(6 total)
5 A nominal
1 A nominal
AC Voltage Inputs
(6 total)
0–300 VL-N operational
Communications ProtocolsFTP, Telnet, SEL ASCII, SEL Fast Message, synchrophasors, DNP3, PRP, PTPv2, IEC 61850-9-2, and IEC 61850 Edition 2
Communications PortsSerial Ports
One front-panel and three rear-panel EIA-232 serial ports
300–57,600 bps
Four-Port Ethernet Card
Four 10/100BASE-T twisted-pair network ports, or
Four 100BASE-FX fiber-optic network ports, or
Two 10/100BASE-T twisted-pair network ports and two
100BASE-FX fiber-optic network ports
Five-Port Ethernet Card
Two 100/1000BASE SFP ports
Three 100BASE SFP ports
SV PortsSubscriber: As many as 7 SV data streams
Publisher: As many as 7 SV data streams
Data rate: 4.8 kHz for 60 Hz system, 4 kHz for 50 Hz system
Protocol: IEC 61850-9-2
Precise-Time InputDemodulated IRIG-B time input and PTPv2
Power Supply24–48 Vdc
48–125 Vdc or 110–120 Vac
125–250 Vdc or 110–240 Vac
Operating Temperature–40°C to +85°C (–40 to +185°F)