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SEL-351RS Kestrel

Single-Phase Recloser Control

The lightweight SEL-351RS Kestrel Single-Phase Recloser Control provides integrated logic, communications, and comprehensive protection for single-phase applications. Convenient operator controls allow easy local access to metering and event data. The rugged, low-maintenance, painted aluminum enclosure reduces the need for cabinet maintenance and repairs. With built-in USB serial and Ethernet media and protocols, including IEC 61850 and IEEE C37.118 synchrophasors, you can easily integrate this control into new or existing communications systems. 

Recloser Compatibility

Installed Accessories

Field-Installed Accessories

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Protection—Protect single-phase distribution circuits with comprehensive protection capabilities, including time-overcurrent, autoreclosing, over-/undervoltage, frequency, and more. Increase service restoration efficiency with accurate fault location.

EZ Settings—Commission the SEL-351RS Kestrel Single-Phase Recloser Control into systems quickly using EZ settings. EZ settings are similar to traditional recloser control settings.

Inrush Detection—Detect transformer energization or motor startup and block tripping until inrush conditions subside using the second-harmonic blocking element.

Flexible Communications—Coordinate relay-to-relay operation with high-speed Mirrored Bits communications. Integrate into serial and Ethernet communications networks with standard DNP3 or Modbus protocols or the optional IEC 61850 protocol.

System Monitoring—View system and recloser conditions using the integrated web server.


    1. 1

      Navigation controls make information readily accessible

    2. 2

      Programmable pushbuttons and configurable labels simplify operation

    3. 3

      EIA-232 front serial port provides local access

    4. 4

      A standard three-point latch improves physical security

    1. 1

      Built-in synchrophasor measurements provide real-time electrical quantities

    2. 2

      16 SELogic variables replace traditional panel switches with 16 latching, 16 local, and 16 remote control points

    3. 3

      Standard multisession Modbus TCP and DNP3 (and optional IEC 61850) protocols enable easy integration with existing systems

    4. 4

      Standard dual-copper Ethernet ports and optional single- or dual-fiber ports improve communications

    5. 5

      Two standard EIA-232 ports, an EIA-485 port, and a USB port provide communications flexibility



Single-Phase Reclosing
The SEL-351RS Kestrel can control, trip, and reclose as many as four times on single phase. This improves reliability and allows sectionalizing of single-phase lines to keep the power on for more customers.

Second-Harmonic Blocking
Detect transformer energization with a second-harmonic blocking element. The output from the harmonic detection element blocks selected tripping elements until inrush conditions subside.

Lightweight and Rugged
One person can easily lift and quickly install this lightweight recloser control. The durable, painted aluminum enclosure will not rust and is rugged enough for line installation. Both enclosure options carry a NEMA 3R rating to ensure reliable performance in all weather conditions.

IEC 61850 Communications Protocol
Combine IEC 61850 technology, Ethernet network, and the SEL-351RS Kestrel for the fastest overall performance of IEC 61850 relays for substation automation and control. Streamline configuration of IEC 61850-enabled relays with acSELerator Architect SEL-5032 Software.

Simple Network Time Protocol (SNTP)
Simplify wiring and installation by receiving a time signal over existing Ethernet networks. SNTP makes a good backup to more accurate IRIG-B time synchronization. The 5 ms accuracy is ideal for basic time synchronization throughout a substation.

Built-In IEEE C37.118 Synchrophasors
Monitor distribution and transmission networks to detect a potential cascading voltage collapse before it happens. IEEE C37.118 synchrophasors, at up to 60 messages per second, allow access to system values for wide-area monitoring and control. The IEEE C37.118 standard simplifies communication and data coordination between synchrophasor measurement units.

acSELerator QuickSet SEL-5030 Software
Speed recloser control application settings by developing settings offline and downloading them to the recloser with QuickSet. The software automatically checks interrelated settings and highlights out-of-range settings. Easily program SELogic control equations, and analyze post-fault event reports.

Mirrored Bits Communications Technology
Provide fast and reliable relay-to-relay communications for advanced communications-assisted protection, network reconfiguration, and restoration schemes.

Modbus, DNP3, and ASCII Protocols
Easily integrate into new or existing networks with these popular protocols. Supervisory control and data acquisition (SCADA) links, local human-machine interface (HMI), and dial-in modems can access important recloser control data.

Relay- and Recloser-Compatible Time-Overcurrent Protection
U.S. (IEEE) and IEC relay curves, user-programmable curves, and all traditional recloser curves are included for maximum recloser control flexibility and coordination. Constant time adder, vertical multiplier, and minimum response time functions provide additional flexibility.

Metering and Power Quality (PQ) Monitoring
Accurate metering eliminates the need for external meters (MW, MVAR, MWh, MVARh, power factor (PF), root-mean-square (rms), and instantaneous/peak demand). PQ monitoring also records voltage sags, swells, and interruptions.

  • Swing-open, painted aluminum, pole-mounted enclosure.
  • Dual fiber Ethernet ports.
  • IEC 61850.
  • Conformal coating.
  • Additional contact I/O.
  • High-capacity battery.

Minimum Software Version

Latest Firmware Versions

There are no firmware versions available for this product.

Product Revision Firmware ID Date Available Serial Number
SEL-351RS Kestrel R103-V0 SEL-351RS-R103-V0-Z003001-D20200224 2/27/20 ~1200580001

The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.

Minimum Software Version

3xx Software Tab

Configuration Software

acSELerator QuickSet SEL-5030 Software

QuickSet is a tool for engineers and technicians to quickly and easily configure, commission, and manage power system devices. QuickSet includes a Graphical Logic Editor and a device template tool to reduce configuration time and streamline deployment.

Learn more and download on the QuickSet software page.

acSELerator Architect SEL-5032 Software

Architect allows users to configure and document IEC 61850 systems that include GOOSE, Sampled Values (SV), or Manufacturing Message Specification (MMS) communications. Architect automatically compares SCL files with IEC 61850 requirements to ensure standard compliance.

Learn more and download on the Architect software page.

Automated Data Collection

SEL Data Management and Automation (DMA) Application Suite

Available on the Blueframe platform, DMA applications automatically collect, store, and manage device-specific information like oscillography, Sequence of Events (SOE) data, device settings, and property information. They also provide automated password rotation and streamlined device audits.

Learn more on the DMA software page.

Visualization and Analysis

SEL-5601-2 synchroWAVe Event Software

synchroWAVe Event helps engineers diagnose a protective relay’s behavior during a power system fault. It is a powerful and easy-to-use solution for displaying and analyzing SEL relay event reports and COMTRADE files.

Learn more and download on the synchroWAVe Event software page.

G&W Electric: Viper-SP

ABB: Elastimold MVR—Single-Phase