ERL — Electrostatic Reset
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
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ERL Fault Indicators are powered by the potential gradient surrounding a high-voltage power line. The ERL displays a faulted line condition by showing a large reflective red target. The 8-square-centimeter red target remains visible until the line is reenergized for the minimum reset time and system voltage required for operation.
ERLs can be installed on energized lines by use of a single hot stick. The hermetically sealed UV-stabilized housing and stainless steel clamp make the ERL tough enough to handle harsh outdoor environments.
- ERL automatically resets upon restoration of system voltage.
- ERL can be applied at strategic intervals along overhead conductors and at midfeeder disconnects to minimize fault-finding time and optimize reliability statistics.
- Inrush restraint feature prevents false tripping during recloser operations.
- The reflective red target (the largest display in the industry) is easy to spot, both at night and during the day.
- Zero maintenance: no battery to replace or monitor.
- Models with the snap-action clamp option are applicable on live-front switchgear—simply install the ERL onto the barrel of the cable termination lug.
| Power Source |
Electric field potential gradient |
| Nominal Trip Ratings |
50 to 1200 A |
| Trip Tolerance |
±10% |
| System Voltage Range (L-L) |
8660 V to 69 kV |
| Reset Time |
Approximately 5 minutes at 5 kVL-N (higher voltages result in quicker reset) |
| Display |
Reflective red target |
| Maximum Fault Current |
25 kA for 10 cycles at 60 Hz |
| Trip Response Time |
1 ms |
| Inrush Restraint Response Time |
300 ms |
| Outer Diameter Clamping Range |
0.25" to 1.6" (please specify clamping diameter or range when ordering) |
| Housing Material |
UV-stabilized polycarbonate resin |
| Clamp Material |
Stainless-steel clamp with a UV-stabilized rubber sleeve |
| Temperature Range |
—40° to +85°C |
| Approximate Weight |
240 g (0.53 lbs) |
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