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 Learn More About the AutoRANGER Family of Products
See the Underground AutoRANGER page
AutoRANGER™
Overhead, Variable Trip, Timed Reset: AR-OH
AutoRANGER™ Test Certificate: ANSI/IEEE Std. 495-1986 
Functional Overview and Operating Principles of
the AutoRANGER™—White Paper
The AutoRANGER field guide is specially designed as a tool for line crews to use in the field. It identifies the AutoRANGER's flashing patterns, display modes, and other features important for a line crew to understand. For a laminated version of the flyer perfect for the field, please call EOS Manufacturing or your local sales representative.
| Features and Benefits |
- Separate, distinct trip levels from 50 to 1200 A
- Trip level self-adjusts based on load current sampling
- Distinct permanent and temporary fault indications
- Inrush restraint protection
- High-visibility, self-adjusting LED display
- Immediate activation upon installation
- High-quality materials
- Reliable electrical components
- UV-stabilized plastics and resins
- Stainless steel hardware
- Simple installation and zero maintenance
- No clamps, screws, or adjustments
- Single hotstick installation
- State-of-the-art microprocessor technology with "Ramp Down Restraint" memory
- The industry's best battery-saving technology
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| Applications |
- Overhead
- Leads line crews quickly to faults on single- or three-phase lines.
- Offers current inrush restraint protection.
- Allows line crews to easily distinguish between a temporary and permanent fault.
- Rural
- Provides a fault indicating solution for 50 A and 100 A applications.
- Allows sufficient time (8-hour flash clearing time at 50 A and 100 A trip levels) for line crews to find faults on remote lines.
- Troubleshooting
- Helps crews troubleshoot problematic sections of overhead and underground lines.
- Simplifies the identification of temporary faults: the yellow LED display flashes when a temporary fault occurs.
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| Installation |
Install SEL AutoRANGER fault indicators on single- or three-phase overhead lines. The AutoRANGER constantly monitors the system load current and automatically adjusts its trip value based on these measurements. |
| Temporary and Permanent Indications |
When a fault occurs, two of the AutoRANGER's red LEDs will begin to flash. After one minute, the indicator will measure the system current. If it detects load current, the AutoRANGER's yellow LED will begin to flash and the red LEDs will turn off, indicating that the fault was temporary. However, if the fault indicator does not detect a load, its two red LEDs will continue to flash for the flash-clearing period to indicate a permanent fault.
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Daytime and Nighttime Modes
- The AutoRANGER's photo sensor measures the amount of ambient light present. Bright light conditions cause the indicator to operate in its full-power, bright-LED "Daytime Mode." The AutoRANGER responds to darker light conditions by operating in "Nighttime Mode," enabling it to conserve energy when less LED light is required. In this low-energy mode, the illuminated housing has 360-degree viewability from a distance of at least 1,000 feet.
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| Specifications |
| Fault Sensing Range |
50 to 1200 A |
| Voltage Range (L-L) |
4160 V to 69 kV |
| Maximum Fault Current |
25 kA for 10 cycles |
| Temperature Range |
-40° to +85°C |
| Trip Response Time |
83 ms |
| Standard Flash Clearing Times |
50 to 100 A ranges - 8 hours
100 to 1200 A ranges - 4 hours |
| Clamping Range Options |
0.30” to 1.5” O.D. |
| Battery |
3.6 V high-capacity lithium battery with
a 15 year life expectancy |
| Flash Life |
>2500 hours (625 four-hour events) |
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Fault Indicators