SEL-2505

Remote I/O Module

The SEL-2505 Remote I/O Module is designed to reduce installation costs, improve employee safety, and increase system reliability in substation and industrial environments. This module provides a solution for simplifying extensive copper wiring and eliminating high-voltage risks from control cables by remotely transmitting the contact inputs and outputs of existing protective relays over fiber-optic cables.

Key Features

MIRRORED BITS® Communications

Communicates with remote devices using two optical fibers, where each contact input controls one of eight transmit bits, and each of the eight receive bits controls an output contact.
High-Speed Control and Monitoring

Provides eight digital contact inputs and eight contact outputs with a fast response time of approximately 10 ms for trip, close, and other control schemes.
Rugged Environmental Durability

Operates over a wide temperature range of -40°C ~ +85°C and features a robust design that exceeds IEEE C37.90 and IEC 60255 protective relay standards.
Versatile Voltage Options

Supports a broad range of digital input voltages, including 12, 24, 48, 110, 125, 220, and 250 Vdc, to accommodate various system environments.
Long-Distance Communication

Supports communication distances up to 80 km (using single-mode fiber) depending on the fiber-optic port option (V-pin, ST multimode, or single-mode).

Wiring and Cost Reduction

Replaces up to 32 large-diameter copper wires between a control building and remote equipment with just two optical fibers, significantly reducing material and labor costs.
Maximum Safety

Using nonconductive fiber-optic cables instead of high-voltage copper wiring negates the risk of dangerous voltages entering the control enclosure and protects personnel.
Intuitive Diagnostics

Allows real-time verification of communication and I/O status through front-panel LED indicators, with a Lamp Test button for easy verification of LED functionality.
Easy Installation

Designed with a small form factor for efficient mounting inside space-constrained control enclosures.
Low Maintenance

The solid-state design with no moving parts minimizes potential points of failure, ensuring long-term reliability backed by SEL's high quality standards.

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