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Protection System

The SEL-351A Protection System has built-in Ethernet and IEEE C37.118 synchrophasors, and is the economical solution for overcurrent 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.

Typically Ships in 5 Days

Starting At

$1,540 USD

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Comprehensive Protection—Provide primary or backup overcurrent protection on distribution feeders with sensitive phase, negative-sequence, residual, and neutral overcurrent protection elements.

Relay Access Convenience—Access basic relay information on a standard Ethernet network with the built-in web server. Securely update firmware and view relay status, settings, and other read-only information within a local network.

Protection Scheme Security—Set the bus overcurrent backup relay close to maximum bus load current levels by using load-encroachment logic to increase security in the system.

Fault Location—Estimate fault locations accurately and reduce total costs by eliminating the need for expensive communications channels, special instrument transformers, prefault information, or line crews to travel the distance of the line for visual fault inspection.

Optimized Asset Utilization—Validate system load flow and fault models by using instantaneous voltage angles from IEEE C37.118 synchrophasors. Use system-state measurements to increase stable system loading through reduced margin requirements.

  • Integrate and automate substation equipment, even devices from multiple vendors, with IEC 61850 communications protocol.
  • Provide primary or backup overcurrent protection on distribution systems with sensitive phase, negative-sequence, residual, and neutral overcurrent protection elements.
  • Use wire-alike terminal configurations to take advantage of advancing technology, improving system protection performance and reducing total costs. This is the wire-alike upgrade for the popular SEL-251 Relay.
  • Set the sensitive phase and ground directional elements for accurate and secure fault detection.
  • Enhance sensitivity with two independent residual ground time-overcurrent elements.
  • Measure and record in nonvolatile memory MW, MVAR, MWh, MVARh, PF, instantaneous and/or peak demand, eliminating the need for external meters.
  • Provide multistep load-shedding schemes using under-/overfrequency elements.
  • Use acSELerator QuickSet SEL-5030 Software to manage your relay settings.
  • Use acSELerator Team SEL-5045 Software to automatically gather relay event reports on your PC and manage them with a database.
  • Use synchroWAVe Event Software


  • SELogic control equations
  • Event reports
  • Sequential Events Recorder (SER)
  • Breaker wear monitor
  • DNP3 Level 2 Outstation
  • Modbus RTU and TCP
  • High-accuracy metering
  • Remote and local control switches
  • Wye or delta voltage connection
  • Synchrophasor measurements
  • Fault locator
  • Fast SER protocol
  • acSELerator QuickSet Compatible
  • Conformal coating
  • SafeLock independent trip/close pushbuttons
  • Dual copper, single or dual fiber-optic Ethernet ports
  • Panel-mount or rack-mount hardware package
  • EIA-485 serial port


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Minimum QuickSet Version

Minimum QuickSet Version

Product Certifications