SEL-2506

Rack-Mount Remote I/O Module

The SEL-2506 Rack-Mount Remote I/O Module has eight digital inputs, eight digital outputs, and a fiber-optic communications port. Connect an SEL-2506 to a fiber-optic port or transceiver on a protective relay to add digital I/O. Or, wire the SEL-2506 I/O to relay I/O to add SEL Mirrored Bits teleprotection.

Starting at

$1,420

Configure and order

Protection and Monitoring

Add simple bus protection using contact inputs and outputs from existing relays. Provide secure pilot communications for existing two- and three-terminal line applications. Add local or remote trip- and close-coil monitoring capability.

I/O Contact Expansion

Economically extend the number of I/O contacts on SEL relays that are Mirrored Bits communications-compatible.

Comprehensive Device Compatibility

Add Mirrored Bits communications to any protective relay (digital or electromechanical) or other intelligent electronic devices (IEDs) for advanced communications-based protection.

Enhanced System Reliability

Reduce or eliminate ground potential rise between IEDs by using fiber-optic links instead of conventional switchboard wiring.

SEL-2506 Features

LEDs indicate the input and output status, channel activity, device status, and communications channel health
Input and output LED labels are userconfigurable

Connectorized screw terminals accept ring lugs with wires up to #10 AWG
Level-sensitive contact inputs do not assert during dc grounds when applied to center-grounded systems
Output contacts are rated for trip and close duty
Standard serial or V-pin fiber port or optional ST® fiber port
Alarm contacts signal self-test and communications channel statuses
Wide-range power supply consumes less than 5 W

SEL-2506 Details

Protection and Monitoring
Add simple bus protection using contact inputs and outputs from existing relays. Add secure pilot communications to existing two- and three-terminal line applications. Add local or remote trip- and close-coil monitoring capability. User-Configurable Labels
Allow clear indication of system function and status. Integration
Expand the I/O of SEL relays that are Mirrored Bits-compatible. Flexible Fiber-Optic Communications
Built-in bidirectional fiber-optic port. Ordering options provide operating ranges from 500 meters to 110 kilometers and compatibility with a variety of SEL fiber-optic transceivers and fiber types (see Table 1). Safety
Replace control wiring to outside cabinets with fiber-optic cable to eliminate paths for dangerous voltages. All I/O terminals are behind the panel. Dependability
Use the communications monitoring feature to alarm when fiber-optic control cabling has been damaged, disturbed, or altered. Fiber-optic links are far less susceptible to electrical interference. Easy Installation and Service
Install the rack-mount, compact two-rack-unit chassis. The SEL-2506 includes screw-terminal connector (STC) blocks for easy replacement of the unit.

Fiber-Optic Port Options:

Transceiver Compatibility	Connectors	Fiber	Distance (km)	SEL Fiber-Optic Cable
SEL-2800 Fiber-Optic Transceivers	V-System	Multimode	0 to 1/2	SEL-C805
SEL-2815 Fiber-Optic Transceivers/Modems	ST	Multimode	2 to 15	SEL-C807, SEL-C808
SEL-2829 Single-Mode Fiber-Optic Transceivers/Modems	ST	Single-mode	0 to 23	-
SEL-2830 Single-Mode Fiber-Optic Transceivers/Modems	ST	Single-mode	16 to 80*	SEL-C809
SEL-2831 Single-Mode Fiber-Optic Transceivers/Modems	ST	Single-mode	16 to 110*	-

*For distances below the minimum, use attenuators on the Transmit fiber.