SEL-421 High-Speed Line Protection, Automation, and Control System
Apply the SEL-421 Protection, Automation, and Control System for high-speed distance and directional protection and complete control of a two-breaker bay.

Protect any transmission line using a combination of five zones of phase- and ground-distance and directional overcurrent elements. A graphical user interface system provides logic and application templates for typical line protection schemes. Patented Coupling Capacitance Voltage Transformer (CVT) transient overreach logic enhances the security of Zone 1 distance elements. Best Choice Ground Directional Element™ optimizes directional element performance and eliminates many directional settings. Optional additional logic prevents Zone 1 overreach on series-compensated lines. Optional incremental components provide ultra-high-speed (subcycle) operation for application on critical lines requiring high-speed fault clearing.  

*Budgetary U.S. Retail, Quantity 1, Base Price = $6,930
Fully Optioned Price = $11,535
Contact your SEL sales representative today for a quote on the configuration and quantity needed for your application.

SEL-311L Line Current Differential Protection and Automation System
Use the SEL-311L Line Current Differential Relay with Integral Four Zone Distance Backup for Easy-to-Apply High-Speed Line Protection.

Apply sub-cycle current differential protection with included four zone distance and directional overcurrent backup. Use single or dual differential channels for reliability. Apply the SEL-311L on two- or three-terminal lines. Unique measuring elements provide coordination with tapped loads. Reduce total project construction and operation costs through integration of the included four-shot recloser and relay logic operators into your automation system.
Improve protection system reliability with continuous checks of communications quality, breaker wear, battery voltage, and relay health. Use the included LCD display in place of traditional panel meters. 

*Budgetary U.S. Retail, Quantity 1, Base Price = $6,045
Fully Optioned Price = $10,440
Contact your SEL sales representative today for a quote on the configuration and quantity needed for your application.

SEL-387L Line Current Differential Relay
Use SEL-387L Line Current Differential Relays for economical line protection with Zero Settings.

Quickly apply proven protection characteristics for phase and ground fault detection. Simply install and wire the SEL-387L, then identify the relay address, and it is ready to begin protecting lines of any voltage. The same proven differential protection system used in the SEL-311L is included in the SEL-387L, providing subcycle operation for severe faults and security for external faults with heavy load flow or CT saturation. Use the battery and communications monitoring included in the SEL-387L to improve system reliability and reduce maintenance costs.
 

*Budgetary U.S. Retail, Quantity 1, Base Price = $2,940
Contact your SEL sales representative today for a quote on the configuration and quantity needed for your application.

SEL-311C Advanced Distance Relay With Recloser
Apply the SEL-311C Relay for three-pole distance protection, reclosing, monitoring, and control of transmission lines.

Apply the SEL-311C for complete three-pole distance protection, monitoring, and control of transmission lines. Features include a four-shot recloser, patented Capacitance Voltage Transformer (CVT) transient overreach logic to enhance security of Zone 1 distance elements, overcurrent elements with directional control, monitoring and metering, and EIA-232 and EIA-485 serial ports for local/remote access and system integration. The SEL-311C also provides a wire-alike solution and application settings for popular SEL-221 line protection relay applications.

*Budgetary U.S. Retail, Quantity 1, Base Price = $4,410
Fully Optioned Price = $5,608
Contact your SEL sales representative today for a quote on the configuration and quantity needed for your application.

SEL-311B Distance Relay With Recloser
Economical step distance protection using the SEL-311B Relay with four-shot reclosing and synchronism check.

The SEL-311B Relay features three zones of positive sequence memory polarized distance protection or compensator distance protection. Zone three can be set for either forward or reverse direction. A four-shot recloser including voltage and synchronism check functions expands the application of the SEL-311B to include protection and breaker reclosing control. The SEL-311B also provides wire-alike solution and application settings for the SEL-221F, 221F-3, 221C, 221-16, and 2PG10 Relays.

*Budgetary U.S. Retail, Quantity 1, Base Price = $3,150
Fully Optioned Price = $3,778
Contact your SEL sales representative today for a quote on the configuration and quantity needed for your application.

SEL-311A Phase and Ground Distance Relay
Implement subtransmission, or backup distance protection at a very low cost with the SEL-311A Relay.

The SEL-311A Relay includes two zones of positive sequence memory polarized distance protection or compensator distance protection. One level of directional or non-directional phase and ground overcurrent protection is also included. Automation features, such as SELOGIC^® Control Equations, Local, Remote, and Latching Switches, and MIRRORED BITS^® communications are incorporated in the relay. The SEL-311A Relay also provides a wire-alike solution and application settings for the SEL-2PG10 Relay.  

*Budgetary U.S. Retail, Quantity 1, Base Price = $1,890
Fully Optioned Price = $2,518
Contact your SEL sales representative today for a quote on the configuration and quantity needed for your application.

SEL-321-0,-1,-2,-3 - Phase and Ground Distance Relay
Select the SEL-321 Relay for complete distance protection including single-pole tripping and series-compensated lines.

The SEL-321 Relay delivers outstanding EHV protection, performance, and features—at a price practical for all voltage levels and with the features you need for system integration.  

*Budgetary U.S. Retail, Quantity 1, Base Price = $5,250
Fully Optioned Price = $9,190
Contact your SEL sales representative today for a quote on the configuration and quantity needed for your application.

SEL-321-5 Phase and Ground Distance Relay
Select the SEL-321-5 for 50 Hz applications requiring enhanced single-pole tripping, phase and ground distance, directional overcurrent, and negative-sequence protection.

The SEL-321-5 Relay is designed especially for EHV and HV applications on 50 Hz systems. The relay provides enhanced single-pole tripping, phase and ground distance, directional overcurrent, negative-sequence overcurrent, and fault locating. The SEL-321-5 Relay contains all the protective elements and control logic necessary to protect, monitor, and control overhead lines.

 

*Budgetary U.S. Retail, Quantity 1, Base Price = $5,600
Fully Optioned Price = $6,650
Contact your SEL sales representative today for a quote on the configuration and quantity needed for your application.

SEL-279H Reclosing Relay
Use the SEL-279H as a reclosing relay for one or two breakers including synchronism checking and voltage checking for single-pole or three-pole applications.

The SEL-279H Relay includes all logic and voltage elements needed to control reclosing sequences and perform synchronism check functions for up to two line breakers. Applications include single, ring-bus, or breaker-and-a-half installations for single-pole or three-pole tripping schemes. Metering and sequence-of-event recording capabilities enhance the basic package. SELOGIC^® Control Equations for programming the output contacts and assigning the logic input functions give this unit unparalleled flexibility. 

*Budgetary U.S. Retail, Quantity 1, Base Price = $2,100
Contact your SEL sales representative today for a quote on the configuration and quantity needed for your application.

SEL-2100 Logic Processor
Create solutions with Mirrored Bits ^® communications and protection logic from SEL.

Implement low cost, high speed bus protection, automated bus sectionalizing, breaker failure protection, multiple terminal line protection, or other applications by interconnecting up to 15 devices using resident MIRRORED BITS communications.

*Budgetary U.S. Retail, Quantity 1, Base Price = $2,100
Fully Optioned Price = $2,835
Contact your SEL sales representative today for a quote on the configuration and quantity needed for your application.

SEL-2126 Fiber-Optic Transfer Switch

Use the SEL-2126 Fiber-Optic Transfer Switch to Maintain Relay Communications During Bypass Operations

Switch several protection protocols simultaneously (MIRRORED BITS^® communications, line current-differential protection, etc.) communicating through fiber-optic links. The SEL-2126 is a high-speed communications device that senses contact inputs to route data streams between remote and local relays, or between the remote and one or two transfer relays.

*Budgetary U.S. Retail, Quantity 1, Base Price = $2,730
Contact your SEL sales representative today for a quote on the configuration and quantity needed for your application.

SEL-9510 Control Switch Module

The SEL-9510 Control Switch Module easily adds independent local control and indication to any installation.

Use the SEL-9510 everywhere independent local control is needed. High-visibility status indicators are viewable from almost any angle and at a distance. Field tested arcsuppression technology provides years of reliable service with less contact wear.

*Budgetary U.S. Retail, Quantity 1, Base Price = $300.
Fully Optioned Price: $365
Contact your SEL sales representative today for a quote on the configuration and quantity needed for your application.

SEL-2505 Remote I/O Module
Directly convert device inputs/outputs to Mirrored Bits^® communications.

Reduce operating time, add self-testing, and simplify wiring for auxiliary inputs and outputs.

*Budgetary U.S. Retail, Quantity 1, Base Price = $525
Fully Optioned Price = $1,575
Contact your SEL sales representative today for a quote on the configuration and quantity needed for your application.

SEL-2594 Contact Transfer Module
Directly transfer contact inputs through IEEE C37.94 Standard fiber-optic multiplexer connections.

Improve safety and isolation with optical fiber interface, while transferring eight inputs and eight outputs through multiplexed communications systems.

*Budgetary U.S. Retail, Quantity 1, Base Price = $1,160
Fully Optioned Price = $1,580
Contact your SEL sales representative today for a quote on the configuration and quantity needed for your application.

• SEL-221-16
• SEL-221F
• SEL-221G
• SEL-2PG10
• SEL-279