Project Description

SEL-2595 Teleprotection Terminal

SEL-2595 Teleprotection Terminal

Securely transfer contacts through high-speed IEEE C37.94 optical fiber interface. Use the SEL-2595 Teleprotection Terminal to send and receive up to eight relay contacts directly over a pair of optical fibers or through a digital T1 or SONET multiplexer.


Front- and Rear-Panel Diagrams

SEL-2595 Front Panel SEL-2595 Rear Panel
Front Rear


Rapidly Clear Faults With High-Speed Teleprotection

Use existing station communications paths with IEEE C37.94 compliant devices for electric power pilot protection schemes. The SEL-2595 Teleprotection Terminal provides better than 5.5 ms back-to-back operating time via 64 kbps communications.

Reduce Costs

Employ eight bidirectional channels per terminal to pass critical protection data for pilot protection schemes such as POTT, DCB, DCUB, and DTT (direct transfer trip).

Improve Reliability

Increase reliability of auxiliary relay functions with the self-testing capability of the SEL-2595. Digital error detection provides better security than audio tone equipment.

Increase Safety and Noise Immunity

Use fiber-optic cable between protection and telecommunications devices to avoid ground paths and induced noise interference. All wiring is behind the panel.

Visualize I/O Status

Print user-configurable labels (included) to clearly indicate I/O usage.

Save Space and Service Time

Reduce your installation to a compact, two-rack unit chassis. Use Connectorized® terminal blocks, instead of screw-terminal blocks, to easily install and remove unit without disturbing wiring.



The SEL-2595 communicates through a remote multiplexer using IEEE C37.94 protocol, eliminating all electrical connections in the communications path.

  • Use existing station communications paths with IEEE C37.94-compliant inputs to send permissive, blocking, and direct transfer trips between stations.
  • Use the SEL-2595 to send transfer trips to and from electromechanical relays.
  • Provide station alarm contacts to a central location for data acquisition, monitoring, or security systems.



2505 2506 2595
Save Wiring Via I/O Multiplexing
I/O for SEL Relays/SEL-3530/SEL-2100 A A
Transfer I/O to SEL-2505/2506
Transfer I/O to SEL-2594/2595
Improve Safety With Optical Fiber
Rack-Mount + +
Panel-Mount + +
Projection Panel-Mount + +
User-Configurable Labels
Screw-Terminal Connectorized Blocks
Digital Inputs (DI) Base 8 8 8
DI Maximum 8 8 8
Digital Outputs (DO) Base 8 8 8
DO Maximum 8 8 8
SEL Mirrored Bits
IEEE C37.94
Standard Feature
+ Model Option
A With SEL-3044 Encryption Card Option With compatible SEL fiber-optic transceiver or interface option or processor.

Product Literature