SEL

SEL-501 Dual Universal Overcurrent Relay

Ordering Information

Budgetary Price:
$1,000

Fully Optioned Price:
$1,607

Online Product Configuration

SEL-501-0, -1, -2 Relay

SEL-501-0, -1, -2 Connectorized Relay

SEL-WA05010W Wiring Harness for SEL-501 and SEL-587 Connectorized® Relays, Features New Shorting Connector

SEL-9900 Relay package 587/501

SEL-9907 Relay package two 501's

SEL-9918 Relay package 551/501

SEL-9927 SEL-501 and SEL-551C for Side-by-Side Mounting in a 19" Rack

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

  • Compact Package
    Two independent three-phase relays (X and Y) in a single compact package simplify two-high switchgear installations with reduced wiring, enhanced protection, and simplified settings. Each relay is configurable for one of several relay applications.
  • Flexible Applications Eliminate Settings
    ComplexitySettings menu includes individual selections for Feeder (FDR), Overcurrent (OC1), Motor (MOT), Breaker Failure (BFR), and Timer (TMR) relay applications. Feeder and overcurrent applications include phase, negative-sequence, and residual ground instantaneous, definite-time, and time-overcurrent elements. The breaker failure application includes breaker failure initiate, retrip, and breaker failure time-delayed operation. The timer relay application includes independent pickup and dropout settings for two outputs driven from a single control input.
  • Motor Protection Application
    The motor relay application includes a patented motor thermal model for applications not requiring RTD (resistive temperature device) inputs. The motor thermal model automatically switches between starting and running conditions, and requires only basic information about the motor.
  • Event Reporting
    The relay stores 20 event report summaries and 12 fifteen-cycle event reports. The event summaries and the last two event reports are stored in nonvolatile memory.
  • Configuration and Control
    Easily configured and controlled from local front panel or through the EIA-232 communications port ASCII/binary interface using off-the-shelf terminal emulation software.
  • Provide simple and economical protection for transformers, breakers, motors, capacitor banks, feeders, and other apparatus.
  • Install the SEL-501 Relay in two-high breaker switchgear to protect two separate feeders, providing primary or backup protection on each feeder.
  • Set one side of the dual relay for a feeder application, and set the other side for a breaker failure application using the simple menu system.
  • Connect one side of the dual relay to transformer high-side CTs for transformer overload and overcurrent protection. Connect the other side of the relay to the neutral CT on the wye side of a delta-wye transformer for sensitive internal ground fault protection and backup external fault protection.
  • Apply both sets of overcurrent relay elements on the same feeder, and cover a wide range of fault currents, while maintaining accuracy of measured load and fault current magnitudes.
  • Provide protection for two motors (using the SEL patented thermal model) when RTDs are not required. (Note: For applications requiring RTD inputs, refer to the SEL-701 Motor Protection Relay).
  • Select the timer application in either or both relays to time-qualify external trips or conditions like underfrequency relay trips, overcurrent trips, and hot or dead voltage conditions. Timers are independent of the current inputs, so when the relays are set for timer applications, currents can remain connected for metering and event reporting.
  • Use SEL-5010 Relay Assistant Software to manage your relay settings.
  • Use SEL-5601 acSELerator Analytic Assistant™ Software to display oscillograms and vector diagrams to analyze event reports.
  • Use the SEL-5802 Motor Modeling Program to model and understand the thermal behavior of your induction motor.
  • Modbus communications protocol.
  • Panel-mount or rack-mount hardware package.
  • Connectorized packaging includes high-current interrupting output contacts.
  • EIA-232 or EIA-485 serial communications — either port includes a demodulated IRIG-B time-code input.
  • Blank bracket to mount one relay in a 19-inch rack. Bracket with mounting hole for FT-1 switch (switch not included) to mount one 500 series relay in a 19-inch rack.

  • Conformal Coating—Protect equipment from harsh environments and airborne contaminants such as hydrogen sulfide, chlorine, salt, and moisture.

    Learn more about conformal coating. 

  • SEL provides options to help you efficiently and safely commission and test these relays.

  • Connectorized tinyWhen access to the back of panels and cabinets is allowed, use a Connectorized® version of this relay for fast installation and testing.

  • SEL accessories simplify operation and enhance the flexibility of SEL products.
  • Add independent breaker control to any relay. The SEL-9510 Control Switch Module easily installs in panel or rack locations for independent local control and status indications. 

Access drawings via the Online Product Configuration link in the Ordering Information box at the top right of this page (below the product photo).

From the Product Configuration page, configure your product or enter your part number via the Universal Part Number Reverse Lookup. Then download custom .dwg or .pdf files specific to your product.

You may also go directly to the Product Configuration page to make a product selection.

To view the latest firmware version currently shipping with this product, go to the Latest Firmware Version page.

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Schweitzer Engineering Laboratories, Inc.

2350 NE Hopkins Court
Pullman, WA 99163 - USA
Phone: +1.509.332.1890
Fax: +1.509.332.7990
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