SEL
ARU

ARU — Underground AutoRANGER® 

Sales and Ordering Information

Please contact Customer Service at
SEL Lake Zurich, Illinois at +1.847.362.8304 

or by email at csrlz@selinc.com

Now available with fiber-optic BEACON® display. 

Choose one low-maintenance fault indicator for your underground applications.

RadioRANGER Compatible 

  • System-Wide Adaptability
    The Underground AutoRANGER’s autoconfiguration features decrease the need for crew training, selection analysis, and inventory, resulting in fewer application errors.
  • Minimal Maintenance
    The AutoRANGER’s ability to adjust for load fluctuations results in a decreased need for field service. Choose a target-only (no LED) display option to eliminate the need for a battery. BEACON LED models have a 15-plus-year product life—minimize trips to the field to replace batteries.
  • Configuration Choices Optimize Performance
    Ensure the best fault-indicating solution for your underground application by choosing from a wide variety of single- and three-phase display options, including remote displays that eliminate the need to open the enclosure to check the fault indicator’s status.
  • Autoadjusting Trip-Level Selection
    Automatic trip-level selection based on sampled load current makes the AR-URD suitable for applications with fault currents ranging from as low as 50 A to greater than 1200 A. This feature simplifies ordering and inventory, and reduces maintenance and application errors.
  • Line-Powered Functionality
    Energy required to power the microprocessor comes from monitored load current rather than a battery, decreasing maintenance and cost of ownership.
  • Dynamic Trip Response Times
    By monitoring current, the AR-URD automatically adjusts its trip response time to better coordinate with upstream protection.
  • Current-Activated Timed Reset
    Each AR-URD derives a normalization current as a function of measured circuit load. The AR-URD uses the normalization current to distinguish circuit restoration from backfeed current; it is this threshold that the AR-URD must detect before initiating the reset timer (0, 2, 4, or 8 hours).
Fault-Sensing Range 50 to 1200 A
Voltage Range Equal to voltage class of shielded underground cable
Minimum Operating Current 3 A
Current-Activated Timed Reset 0, 2, 4, or 8 hours
Battery (for BEACON LED display only) 3.6 V high-capacity lithium battery with a 20-year shelf life
Dynamic Trip Response Time Function of trip level
Inrush Restraint Response Time 5 cycles
Temperature Range —40° to +85°C
Note: Selection of fiber-optic BEACON display option will change product functionality. Consult SEL for details.

Tamperproof Bolt Display

BEACON Bolt® Display

Standard “V” Display

Three-Phase “3” Display

Large “L” Display

 Radio Ranger Remote Display

RadioRANGER® Remote Fault Reader Display

    

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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