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SEL Numerical Relays

SEL revolutionized power system protection by building the first microprocessor-based protective relay. Today, SEL leads in protective relays with high-speed, secure, and dependable fault detection; accurate fault location; and comprehensive automation and control functions. SEL relays have the highest mean time between failures (MTBF) in the market (over 500 years).


SEL-701 Motor Protection Relay

SEL-701 Motor Protection Relay
  • SEL-701 Motor Protection Relay
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Product Details:

Voltage TypeDC
Voltage (V)250
Number of Poles4 Pole
Current (Amps)5

The SEL-701 Motor Protection Relay provides complete induction motor protection combined with innovative monitoring, reporting, metering, and control capabilities.
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SEL-710 Motor Protection Relay

SEL-710 Motor Protection Relay
  • SEL-710 Motor Protection Relay
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Product Details:

Voltage TypeDC
Voltage (V)220
Number of Poles4 Pole
Current (Amps)1

The SEL-710 Motor Protection Relay features the industry’s most accurate motor protection together with settings, mounting, and communications options designed for easy application. The SEL-710 with the Accu Track Thermal Model determines the longest safe starting time (no speed switch needed) and reduces the wait time between motor starts up to 33 percent. Choose from eight communications protocols, including Ethernet, Modbus, IEC 61850, and Device Net for fast integration into control systems.

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SEL-710-5 Motor Protection Relay

SEL-710-5 Motor Protection Relay
  • SEL-710-5 Motor Protection Relay
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Product Details:

Voltage TypeDC
Voltage (V)220
Number of Poles4 Pole
Current (Amps)5

Protect asynchronous (induction) and synchronous motors with one SEL-710-5 Motor Protection Relay. Features include broken rotor bar detection and variable-frequency drive (VFD) support as well as options for arc-flash detection, differential protection, and synchronous motor protection. The synchronous option supports power factor regulation and also includes, at no additional cost, a voltage divider accessory to interface with the motor excitation system. Together with the industry’s best AccuTrack Thermal Model, these new features combine to provide a great solution for all of your motor protection applications.
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SEL-749M Motor Relay

SEL-749M Motor Relay
  • SEL-749M Motor Relay
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Product Details:

Voltage TypeDC
Voltage (V)220
Number of Poles4 Pole
Current (Amps)5

Get comprehensive motor protection and SEL-exclusive reporting and trending that save you money in your industrial motor plant and processes. The SEL-749M Motor Relay uses the latest enhancements in the SEL-patented thermal overload model to accurately track the heating effects of operating and cyclic overload currents. The relay offers all basic motor protection features, including short-circuit, load loss, load jam, and frequent-starting protection as well as imbalance current and phase reversal protection. Add optional voltage, I/O, and communications capabilities to build the SEL-749M that is just right for your application.
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SEL-849 Motor Management Relay

SEL-849 Motor Management Relay
  • SEL-849 Motor Management Relay
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Product Details:

Voltage TypeDC
Voltage (V)110
Number of Poles4 Pole
Current (Amps)5

The SEL-849 Relay offers current-, voltage-, and thermal-based motor protection; arc-flash detection; and power metering. It also provides all basic motor protection features, including protection for the following conditions:

  • Short circuit
  • Load loss
  • Load jam
  • Frequent starting
  • Imbalanced current
  • Phase reversal

The SEL-849 installs easily inside a motor control center (MCC). The optional SEL-3421 and SEL-3422 Motor Relay HMIs (human-machine interfaces) install on the front of the MCC.

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SEL-501 Dual Universal Overcurrent Relay

SEL-501 Dual Universal Overcurrent Relay
  • SEL-501 Dual Universal Overcurrent Relay
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Product Details:

Voltage TypeDC
Voltage (V)220
Number of Poles4 Pole
Current (Amps)5

The SEL-501 Dual Universal Overcurrent Relay is two complete sets of protection; both can be configured as one of five basic relays.

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SEL-2600 RTD Module

SEL-2600 RTD Module
  • SEL-2600 RTD Module
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Measure and transmit data from up to 12 resistance temperature detectors (RTDs) and a single contact status located in transformers, breakers, motors, generators, or other system apparatus.
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SEL-311C Transmission Protection System

SEL-311C Transmission Protection System
  • SEL-311C Transmission Protection System
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Product Details:

Voltage TypeAC

Apply the SEL-311C Relay for protection, reclosing, 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, and over current elements with directional control, monitoring, and metering. Apply three-pole tripping logic, or select the SEL-311C-3 for single-pole tripping. The SEL-311C comes standard with EIA-232 serial ports as well as a 10/100 BASE-T Ethernet port for local/remote access and system integration. IEEE C37.118 compliant synchrophasors are included for improved situational awareness.

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SEL-321 Phase and Ground Distance Relay

SEL-321 Phase and Ground Distance Relay
  • SEL-321 Phase and Ground Distance Relay
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The SEL-321 Relay delivers outstanding extra-high-voltage (EHV) protection, performance, and features-at a price practical for all voltage levels and with the features you need for system integration.
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SEL-321-5 Phase & Ground Distance Relay

SEL-321-5 Phase & Ground Distance Relay
  • SEL-321-5 Phase & Ground Distance Relay
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Product Details:

Relay TypeVoltage Relay

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.
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SEL-411L Advanced Line Differential Protection, Automation Relays

SEL-411L Advanced Line Differential Protection, Automation Relays
  • SEL-411L Advanced Line Differential Protection, Automation Relays
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Product Details:

Voltage Typeon

Apply the SEL-411L Relay for complete protection and control of any transmission line. The SEL-411L provides differential protection with both phase- and sequence-based operating elements for sensitivity and high-speed operation. Choose from many popular fiber and multiplexed communications options. Distance protection and logic from a complete SEL-421 Protection, Automation, and Control System are included to provide backup protection and integration. Any transmission line (short, long, or series-compensated) can be well protected with the SEL-411L Relay.
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SEL-T400L Time-Domain Line Protection

SEL-T400L Time-Domain Line Protection
  • SEL-T400L Time-Domain Line Protection
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Apply the SEL-T400L Time-Domain Line Protection for ultra-high-speed and secure protection of critical lines. With breakthrough time-domain technologies, the SEL-T400L securely trips in as fast as 1 millisecond, records events with sampling up to 1 MHz, and detects faults accurately to the nearest tower with single- and double-ended traveling wave fault locators. The SEL-T400L complements your traditional protection and gives you speed.
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SEL-351 Protection System

SEL-351 Protection System
  • SEL-351 Protection System
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Product Details:

Voltage Typeon

The SEL-351 Protection System has built-in Ethernet and IEEE C37.118 synchrophasors, and is ideal for directional overcurrent applications. Optional Mirrored Bits communications and power quality monitoring add flexibility to solutions. The SEL-351 is the protection standard for utility and industrial electrical systems around the world.
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SEL-351A Protection System

SEL-351A Protection System
  • SEL-351A Protection System
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Product Details:

Voltage Typeon

The SEL-351A Protection System has built-in Ethernet and IEEE C37.118 synchrophasors, and is the economical solution for over current protection. Easy-to-use feeder protection and innovative features like SEL’s Best Choice Ground Directional Element logic and SELogic control equations provide superior protection on utility and industrial power systems.
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SEL-451 Protection, Automation, and Bay Control System

SEL-451 Protection, Automation, and Bay Control System
  • SEL-451 Protection, Automation, and Bay Control System
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Voltage Typeon

The SEL-451 Protection, Automation, and Bay Control System is a complete standalone system. The SEL-451 has the speed, power, and flexibility to combine complete substation bay control with high-speed breaker protection in one economical system. Use the SEL-451 as an integral part of a full substation protection, control, and monitoring solution. Reduce maintenance costs by accurately tracking the breaker operation. Monitor breaker interruption times and the accumulated breaker duty to easily determine the need for proactive maintenance. Integrate information with SCADA or automation systems through a communications processor or directly to the Ethernet port.
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SEL-4520 Arc-Flash Test Module Numerical Relays

SEL-4520 Arc-Flash Test Module Numerical Relays
  • SEL-4520 Arc-Flash Test Module Numerical Relays
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Voltage Typeon

The SEL-4520 Arc-Flash Test Module provides a convenient way to test the operation of arc-flash detection relays installed in metal-clad and metal-enclosed switchgear. The SEL-4520 is used to test the SEL-751 and SEL-751A Feeder Protection Relays and other arc-flash detection relays that use light and overcurrent to sense an arc-flash event.
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SEL-551C Overcurrent/Reclosing Relay

SEL-551C Overcurrent/Reclosing Relay
  • SEL-551C Overcurrent/Reclosing Relay
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Minimum Order Quantity1 Piece
Voltage Typeon

The SEL-551C Overcurrent/Reclosing Relay provides overcurrent relay users with new flexibility in distribution system protection. The SEL-551C provides six inputs and three outputs, with up to two communications ports, for more control options. The SELogic control equations have added rising and falling edge triggers and latches for custom logic applications.
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2664 Field Ground Module

2664 Field Ground Module
  • 2664 Field Ground Module
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Add the SEL-2664 Field Ground Module to the SEL-300G or SEL-700G to protect all the critical components in your generator with one comprehensive relay. Or, add the SEL-2664 to the SEL-2664S to complete ground fault protection on both the rotor and stator.
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2664S Stator Ground Protection Relay

2664S Stator Ground Protection Relay
  • 2664S Stator Ground Protection Relay
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Protect high-impedance grounded generators from ground faults at standstill, during startup, and while running by using the multisine frequency injection and neutral overvoltage-based protection in the SEL-2664S Stator Ground Protection Relay.
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300G Generator Relay

300G Generator Relay
  • 300G Generator Relay
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SEL-300GGenerator Relay

Provide proven primary and backup protection for utility and industrial generators to IEEE turbine protection standards.

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547 Distributed Generator Interconnection Relay

547 Distributed Generator Interconnection Relay
  • 547 Distributed Generator Interconnection Relay
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Distributed Generator Interconnection Relay

Apply the flexible SEL-547 at the transfer switch site (interconnection point between the utility and the customer) and at each individual generator site. When the SEL-547 at the transfer switch site detects utility supply problems, it separates the customer system from the utility supply. When the SEL-547 at an individual generator site detects a system problem that could adversely affect the generator, it separates the individual generator from the rest of the system. The SEL-547 product flyer figures show examples of the SEL-547 "in action" at the transfer switch site and at an individual generator site. Other applications and scenarios are possible.

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587 Current Differential Relay

587 Current Differential Relay
  • 587 Current Differential Relay
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Current Differential Relay

The SEL-587 Current Differential/Overcurrent Relay provides protection for any two-input apparatus, such as transformers, motors, generators, and reactors. Apply it for differential and overcurrent protection and use event reports for quick post-event analysis.

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700G Generator Protection Relay

700G Generator Protection Relay
  • 700G Generator Protection Relay
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The SEL-700G Relay is the right solution for utility and industrial generator protection, with an autosynchronizer, flexible I/O, and advanced communications. Apply the SEL-700G Relay for comprehensive primary and backup generator protection.

The SEL-700G provides a complete protection and synchronization solution for synchronous generators. Eliminate the complexity and cost of standalone synchronizer packages. Integrating the synchronization capability into the generator protection relay provides the most cost-effective and reliable solution. Easily upgrade protection without cutting or drilling existing cutouts with a small form factor and multiple mounting adapters. Quickly integrate into serial- or Ethernet-based communications with Modbus, DNP3, IEC 61850, Mirrored Bits communications, and other protocols.

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2414 Transformer Monitor

2414 Transformer Monitor
  • 2414 Transformer Monitor
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Transformer Monitor

The SEL-2414 Transformer Monitor withstands harsh physical and electrical environments and is built and tested to meet mission-critical IEEE and IEC protective relay standards. Apply the SEL-2414 to satisfy standalone or distributed monitoring and control of transformers, or choose from the flexible communications options to connect to a substation distributed SCADA or automation system, or a SCADA master. Choose I/O options that fit your unique needs, from detecting oil levels and sudden pressure to alerting alarm systems or control functions. As always, the SEL-2414 is protected by SEL's no-questions-asked, worldwide, ten-year product warranty. 

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352 Breaker Failure Relay

352 Breaker Failure Relay
  • 352 Breaker Failure Relay
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Breaker Failure Relay

The SEL-352 Breaker Failure Relay provides breaker failure protection, breaker control, and breaker monitoring. Features include a cost-saving data recorder and a sophisticated breaker monitor and controller to reduce maintenance and supervise manual operations. SELogic control equations provide flexibility in applying the SEL-352 Relay for a variety of applications.

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387A Current Differential and Overcurrent Relay

387A Current Differential and Overcurrent Relay
  • 387A Current Differential and Overcurrent Relay
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Current Differential and Overcurrent Relay

The SEL-387A Current Differential and Overcurrent Relay offers restrained and unrestrained differential protection for two terminals. Second-, fourth-, and fifth-harmonic elements, augmented by the dc element, provide security during transformer energization and overexcitation conditions in a user-defined choice of either harmonic restraint or harmonic blocking. Overcurrent elements provide backup protection that contributes to the versatility of the SEL-387A.

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387E Current Differential And Voltage Relay

387E Current Differential And Voltage Relay
  • 387E Current Differential And Voltage Relay
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The SEL-387E Current Differential and Voltage Relay provides protection to two- or three-winding power transformers. Voltage inputs for power metering, overexcitation protection, and over-/underfrequency load shedding provide versatile solutions for power apparatus protection. Automation features reduce total project construction and operation costs through elimination of traditional external control switches, meters, and indicating lamps.
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487B Bus Differential and Breaker Failure Relay

487B Bus Differential and Breaker Failure Relay
  • 487B Bus Differential and Breaker Failure Relay
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The SEL-487B provides optimized, low-impedance bus differential fault detection by using high-speed, subcycle protection coupled with high-security operation for external faults. Superior protection performance is combined with integrated station automation features for seamless transition into new and retrofit applications. Optional Time-Domain Link (TiDL) technology transforms the way you modernize your substation.
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787-3E/-3S/-4X Transformer Protection Relay

787-3E/-3S/-4X Transformer Protection Relay
  • 787-3E/-3S/-4X Transformer Protection Relay
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Protect and monitor most two-, three-, and four-winding transformers with the versatile SEL-787 platform. It provides advanced automation and flexibility, asset management data, and easy retrofitting of most electromechanical relays. The 5-inch, 800 × 480 color touchscreen display option allows you to directly set, monitor, and control your system from the relay front panel.

The SEL-787-2E/-21/-2X models offer two-winding differential protection, and the SEL-787-3E/-3S models offer three-winding differential protection. Select the SEL-787-4X for current-based four-winding differential protection.

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401 Protection Automation and Control Merging Unit

401 Protection Automation and Control Merging Unit
  • 401 Protection Automation and Control Merging Unit
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Apply the SEL-401 for substations with IEC 61850-9-2 Sampled Values (SV) systems. Sample analog data, such as currents and voltages, then publish that data to a fiber network for use in other IEDs such as the SEL-421-7. The SEL-401 publishes sampled values to the process bus network and also provides local protection. Use the built-in phase-overcurrent and breaker failure protection to provide backup in case of communications system failures.
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