Sel 2505. DIN rail PLC SEL3505 series Schweitzer Engineering Laboratories Protection and Monitoring Add simple bus protection using contact inputs and outputs from existing relays The SEL-2505 is a fiber-optic device that adds digital I/O and communications to protective relays or other IEDs
SEL Relay Logic Diagram from pdfslide.net
Use the SEL-2595 Teleprotection Terminal to securely transfer teleprotection signals through a high-speed IEEE C37.94 optical-fiber interface Or, connect an SEL-2505 to a fiber-optic port or transceiver on a protective relay to add digital I/O
SEL Relay Logic Diagram
for auxiliary inputs and outputs with the SEL-2505 Remote I/O Module, SEL-2506 Rack-Mount Remote I/O Module, and SEL-2507 High-Speed Remote I/O Module It is superior to hard-wiring relays together through electromechanical or static auxiliary relays, because you can now monitor the performance of the communication channel. Or, connect an SEL-2505 to a fiber-optic port or transceiver on a protective relay to add digital I/O
SEL2505 PLC Module/Rack by SCHWEITZER ENGINEERING. Protection and Monitoring Add simple bus protection using contact inputs and outputs from existing relays See features, benefits, applications, and diagrams of the SEL-2505 in this PDF document.
HWLT0023 (Sel2505) PDF. The SEL-2505 is a device that communicates with remote relays using fiber-optic cables and Mirrored Bits® protocol The SEL-2505 is an excellent auxiliary relay or a simple way of expanding the number of I/O points available in a system of relays