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


SEL-421 SV Merging Unit


  • IEC 61850-9-2 Sampled Values merging unit (publisher) for a digital secondary system solution
  • Distance protection plus subcycle elements and series compensation logic
  • Power supply: 125–250 Vdc or 110–240 Vac
  • 4U chassis and horizontal rack mount
  • 5 A secondary current inputs
  • 300 V phase neutral secondary voltage inputs with conformally coated circuit boards
  • 24 optoisolated level-sensitive inputs, 2 standard Form A outputs, and 6 high-speed high-current interrupting Form A outputs
  • Ethernet card with four 10/100BASE-FX connectors
  • Protocols: FTP, Telnet, Synchrophasors, DNP3, and IEC 61850 with Sampled Values subscription