html{display:none} SEL-GFD Underground Ground Fault Detector | Schweitzer Engineering Laboratories

SEL-GFD

Underground Ground Fault Detector

The SEL-GFD provides the following features and benefits:

  • Ground fault detection by sensing the vector sum of the current flowing through a three-conductor cable.
  • Three reset options (secondary voltage, load current, or time) to meet various application needs.
  • Split-core sensor that installs on three-phase cables without opening the primary.
  • Large reflective red target display that is easy to see both at night and during the day.
  • Submersible, vinyl-coated sensing core.
  • Stainless steel hardware and UV-stabilized materials to ensure a long product life.

Thousands of SEL-GFDs in service today help customers around the world quickly locate ground faults.

Starting At

$204 USD

Request a Follow-Up

*Required


Industrial Sites—Apply the SEL-GFD over a three-phase cable bundle at ground potential in live-front switchgear to identify faults on circuits feeding mining equipment, medical facilities, and other industrial equipment. The vinyl-coated sensor core and potted circuit components provide an excellent seal against moisture and humidity in challenging industrial environments. The split-core sensor installs on three-phase cables without the need to open the primary or interrupt vital industrial operations.

Underground Cable at Substations—Apply the SEL-GFD to an underground cable distribution circuit feeder before the feeder leaves the substation to identify ground faults in the underground section of the circuit.

Low Load Current—Choose a secondary reset option to power and reset the SEL-GFD from secondary voltage (120–240 VacL-N) at a transformer. The SEL-GFD reset and powering options provide a wide range of compatibility across various applications, especially where feeders are lightly loaded or there is no load present.

Power SourceSecondary voltage (120 to 240 VacL-N at 50 to 60 Hz), load current (≥3 A), or lithium battery for timed-reset products
Reset Time (Timed Reset Models Only)4, 8, or 24 hours
Nominal Trip Ratings20, 40, 50, or 100 A
Trip Tolerance±10 percent
Maximum Fault Current25 kA
Trip Response Time1 ms
Outer Diameter Clamping Range4" (6" optional)
Housing MaterialsUV-stabilized polycarbonate resin)
SubmersibilityUp to 15 feet

Literature

Documents sorted by newest first.

Literature

Publications

Drawings