The SEL-ARU is a reliable faulted circuit indicator suitable for applications with fault current 50 A and up. It automatically selects a minimum trip threshold based on sampled load current to better coordinate with upstream protection. SEL underground AutoRANGER technology supports system-wide adaptability, eliminating the need to deploy different fixed-trip threshold fault indicators. Being able to use one indicator across many applications simplifies ordering, inventory, installation, and crew training.
You can choose from a variety of displays: a target-only (no LED) display option to eliminate the need for a battery, BEACON Bolt LED models that minimize travel to the field to replace batteries, and auxiliary contact options that provide an economical way to indicate status to SCADA systems.
Underground Fault Detection—Find faults quickly on underground distribution systems. Display options are available for pad-mounted, vault, and manhole installations. Line-powered and restoration reset features provide a long indicator life and no- or low-maintenance performance for any application.
Subsurface Vaults and Manholes—Use the SEL-ARU in subsurface applications with the RadioRANGER Underground Wireless Fault Indication System. The RadioRANGER System provides remote indication of the fault indicator status without accessing the vault, minimizing patrol time.
Underground Reliability Improvement—Increase reliability on underground distribution circuits by installing underground AutoRANGERs in the following applications:
Auxiliary contact options provide an economical way to indicate status to SCADA systems, and you can choose from a variety of remote displays.
You can choose from a variety of remote displays:
|SEL-ARU||SEL-ARU With Fiber-Optic Display|
|Trip Thresholds||50 to 1,200 A|
|Voltage Range||Equal to voltage class of shielded underground cable|
|Maximum Fault Current||25 kA for 10 cycles|
|Minimum Operating Current||3 A|
|Current-Activated Timed Reset||0, 2, 4, 8, or 12 hours||N/A|
|Time Reset With Current Reset Override||N/A||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|
|Trip Response Time||Function of trip threshold|
|Inrush Restraint Response Time||5 cycles|
|Approximate Weight||560 g (1.25 lbs)||840 g (1.85 lbs)|
|Temperature Range||–40° to +85°C (–40° to +185°F)|
The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.