EL3100 Series – Ground-Fault Relay Series - Littelfuse EL3100 Ground-Fault Relays Provide Superior Electrical Protection

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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The EL3100 series ground-fault, phase-voltage indication system operates on ungrounded ac systems. It is a self-powered unit used to detect ground faults for three-phase systems. The EL3100 meets the NEC Article 250.21(B) and the CEC requirements for ground detectors for ungrounded alternating-current systems. Voltage connections are provided for 208, 240, 480, and 600 V systems. The EL3100 can operate stand-alone or with up to five remote LED indicators. A solid-state relay output provides indication of a ground fault. The output relay is closed when the 3-phase neutral voltage shifts as the result of ground leakage. Three green LEDs indicate the presence of phase-to-ground voltage, and one red LED indicates a ground fault.


  • NEC® and CEC Code compliant
  • Low-voltage remote LEDs
  • Phase-voltage indication
  • Output relay

Access specifications, certifications, check availability and order parts below

Catalog #Supply
Relay Contacts ConfigRelay
DimensionsWeight (lbs/g)Conformally coatedSystem typeStockSamples
EL3100-00208 - 600N/ANon Fail-safeNon Fail-safe3.4 H x 4.4 W x 2.2 D in. (87 x 112.5 x 56 mm)0 KgStandardGrounded/UngroundedCheckOrder
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