| AC Current Inputs (6 total) | 5 A nominal 1 A nominal |
| AC Voltage Inputs (6 total) | 0–300 VL-N operational |
| Communications Protocols | FTP, Telnet, SEL ASCII, SEL Fast Message, synchrophasors, DNP3, PRP, PTPv2, and IEC 61850 Edition 2.1 (For PTPv2 implementation, Ports 5A and 5B must be used for engineering access and SCADA.) |
| Traveling-Wave Fault Locating (SEL-411L-1 only) | Type: Double-ended method Accuracy: ±25 m for step change in current applied simultaneously to both relays |
| Communications Ports | Serial 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 |
| TiDL Ports | Fiber-optic ports: 8 Range: ~2 km Data rate: 100 Mbps Protocol: SEL T-Protocol |
| SV Ports | Subscriber: 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 Input | Demodulated IRIG-B time input and PTPv2 |
| Processing | AC voltage and current inputs: 8,000 samples per second Protection and control processing: 8 times per power system cycle |
| Power Supply | 24–48 Vdc 48–125 Vdc or 110–120 Vac 125–250 Vdc or 120–240 Vac |
| Operating Temperature | –40° to +85°C (–40° to +185°F) |