html{display:none} SEL-487B Bus Differential and Breaker Failure Relay - Specifications | Schweitzer Engineering Laboratories


AC Current Inputs
(21 total)
5 A nominal
1 A nominal
AC Voltage Inputs
(3 total)
0-300 VL-N operational
Communications ProtocolsFTP, Telnet, SEL ASCII, SEL Fast Message, DNP3, PRP, PTPv2, and IEC 61850 Edition 2 (optional)
Communications PortsSerial Ports
One front-panel and three rear-panel EIA-232 serial ports
300–57,600 bps
Two-Port Ethernet Card
Two 100BASE-FX fiber-optic network ports
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
TiDL PortsFiber-optic ports: 8
Range: ~2 km
Data rate: 100 Mbps
Protocol: SEL T-Protocol
SV PortsSubscriber: 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
ProcessingAC voltage and current inputs: 8,000 samples per second
Protection and control processing: 12 times per power system cycle
Power Supply24–48 Vdc
48–125 Vdc or 110–120 Vac
125–250 Vdc or 110–240 Vac
Operating Temperature–40° to +85°C (–40° to +185°F)