html{display:none} Popular Configuration | Schweitzer Engineering Laboratories


Ultra-High-Speed Line Relay

SEL-T401L (5 A, 48–125 Vdc, 110–120 Vac)

  • Ultra-high-speed line protection with time-domain* and phasor-based elements and schemes.
  • Single- and double-ended traveling-wave fault locator, accurate to a tower span.
  • Line monitor for condition-based line maintenance to prevent recurring faults.
  • Ultra-high-resolution transient recorder to record six currents and six voltages.
  • Flexible protection signaling using configurable encoding methods, SEL MB or IEEE C37.94.
  • SCADA/HMI integration and engineering access using DNP3 LAN/WAN, FTP, Telnet, and FTDV.**
  • Rated input current: 5 A; power supply rated voltage: 48–125 Vdc, 110–120.

*For the TW87 scheme, order transceivers for the direct fiber-optic channel separately to account for the line length and fiber losses of a particular application.
**Order a 1 Gbps SFP transceiver for the engineering access port if you plan on using the FTDV protocol.

Contact Input Rated Voltage 48 Vdc110 Vdc125 Vdc
Sales Item Number T401L#0005 T401L#0009 T401L#0007
Select Select Select